JP6523800B2 - Knock type writing instrument - Google Patents

Description

  The present invention relates to a knock-type writing instrument.

  The writing unit, which is a pen point, is a shaft by performing a knocking operation that has an operation unit at the rear end of the shaft cylinder and presses the operation unit forward against the biasing force of a spring disposed in the shaft cylinder. A so-called knock-type writing tool is known in which the writing state protruding from the tip of the tube and the non-writing state in which the writing unit is immersed in the barrel are switched (for example, Patent Document 1).

JP 2011-37087 A

  In the writing instrument described in Patent Document 1, the operation unit also plays a role of a friction body for rubbing the thermochromic ink of the writing instrument. Therefore, at the time of the rubbing operation, in order to perform the stable rubbing operation, it is necessary to rotate the operation portion in the circumferential direction to prevent the movement in the front-rear direction. Such operation is troublesome.

  An object of the present invention is to provide a knock-type writing instrument provided with a simple mechanism that makes it possible to perform a stable rubbing operation and the like.

  According to one aspect of the present invention, a writing state and a non-writing state can be switched by performing a knock operation including a shaft cylinder, an operation unit, and a rotor and pressing the operation unit forward. A knock type writing tool, further comprising a knock lock member capable of moving in the longitudinal direction in the shaft cylinder by gravity, and a locking portion provided on the inner surface of the shaft cylinder and capable of locking with the knock lock member. When the front end of the barrel is directed upward, the knock lock member moves rearward and locks with the locking portion, thereby preventing the forward movement of the operation portion. An expression writing instrument is provided. The "front" shown here indicates the writing part side in the writing state, and the other end side is called "rear".

  Further, according to another aspect, there is provided a knock-type writing instrument characterized in that the knock lock member is a tubular member.

  Further, according to another aspect, the rotor or the operation portion has a cam surface facing the knock lock member, and the knock lock member has a cam receiving surface that cooperates with the cam surface. When the knock lock member moves rearward, the cam surface and the cam receiving surface cooperate to rotate the knock lock member in the circumferential direction, and the locking portion and the knock lock member are locked. There is provided a knock-type writing instrument characterized in that.

  Further, according to another aspect, there is provided a knock type writing instrument characterized in that the operation portion has the cam surface facing the knock lock member, and the rotor is disposed in the operation portion. Ru.

  Further, according to another aspect, when the knock lock member has a first projection and the locking portion has a second projection, the first lock is formed when the knock lock rotates in the circumferential direction. The knock-type writing instrument according to the present invention is characterized in that the knock lock member and the locking portion are locked by locking the second protrusion with the second protrusion.

  Further, a concave portion is formed on a side surface of the first projection or the second projection, and the first projection and the second projection are engaged by the concave. A knock-type writing instrument is provided.

  Further, two of the concave portions are formed back and forth with respect to one of the first protrusion or the second protrusion, and the other of the two is formed in each of the writing state and the non-writing state. There is provided a knock-type writing instrument characterized in that it can be engaged with a projection.

  Further, two of the concave portions are formed back and forth with respect to the second protrusion or one of the first protrusions, and the other of the second protrusion is formed in each of the writing state and the non-writing state. There is provided a knock-type writing instrument characterized in that it can be engaged with a projection.

  Further, there is provided a knock-type writing instrument characterized in that the recess has a shape complementary to a part of the protrusion to be locked.

  In addition, the plurality of first protrusions and the plurality of second protrusions are respectively arranged at equal intervals in the circumferential direction, and one protrusion of the first protrusion or the second protrusion is provided. A knock-type writing tool is characterized in that a guide groove extending in the front-rear direction is defined therebetween, and the other projection moves in the guide groove in accordance with the movement of the knock lock member in the front-rear direction. Provided.

  Further, the knock-type writing instrument is provided, wherein the recess has an inclined surface for guiding the protrusion to be locked into the guide groove.

  According to another aspect, a window is provided on the side surface of the barrel, and the knock lock member can be viewed through the window when the knock lock member is close to the rear end in the barrel, It can not be seen through the window when it is near the front end in the shaft cylinder, or it can be seen through the window when the knock lock member is near the front end in the shaft cylinder There is provided a knock-type writing instrument characterized in that it can not be viewed through the window when in the shaft cylinder, when approaching the rear end side.

  Further, according to another aspect, there is provided a knock-type writing instrument characterized in that the shaft cylinder and the portion of the knock lock member visible through the window portion are formed in different colors.

  Further, according to another aspect, there is provided a knock type writing instrument characterized in that forward movement of the knock lock member is blocked by abutment with a shock absorbing member.

  In addition, it is desirable that a knock-type writing instrument be characterized in that all or part of the operation section is an erasing section capable of erasing the handwriting of the knock-type writing instrument.

  Further, according to another aspect, the knock-type writing instrument is a knock-type writing instrument having a thermochromic ink, and the frictional heat generated upon rubbing by the erasing unit can thermally discolor the handwriting by the thermochromic ink A knock-type writing instrument is provided, characterized in that

  According to an aspect of the present invention, a common effect of providing a knock-type writing instrument provided with a simple mechanism that makes it possible to perform a stable rubbing operation and the like is achieved. In addition, it is possible to provide a knock-type writing instrument that can easily determine whether or not a stable rubbing operation is possible.

It is a longitudinal cross-sectional view in the non-writing state of the writing instrument by 1st Embodiment of this invention, and a front end is upwards. FIG. 2 is a longitudinal cross-sectional view of the writing instrument of FIG. 1 in a non-writing state and with the front end facing downward. FIG. 2 is a longitudinal cross-sectional view of the writing instrument of FIG. 1 in a writing state and with the front end facing downward. It is an exploded view of the knock mechanism of the writing instrument of FIG. It is a fragmentary longitudinal cross-sectional view of the inner cylinder of the writing instrument of FIG. It is a perspective view of the operation part of the writing instrument of FIG. It is a perspective view of the rotor of the writing instrument of FIG. It is a perspective view of the knock lock member of the writing instrument of FIG. It is another perspective view of the knock lock member of the writing instrument of FIG. It is a longitudinal cross-sectional view of the rear axis of the writing instrument of FIG. It is a rear view of the rear axis of the writing instrument of FIG. It is a schematic diagram which shows the switch from the non-writing state of the knock mechanism of the writing instrument of FIG. 1 to a writing state. It is a longitudinal cross-sectional view in the non-writing state of the writing instrument by 2nd Embodiment of this invention, and a front end is upwards. FIG. 14 is a longitudinal cross-sectional view of the writing instrument of FIG. 13 in the unwritten state and with the front end facing downward. FIG. 14 is a longitudinal cross-sectional view of the writing instrument of FIG. 13 in a writing state and with the front end facing downward. FIG. 14 is a longitudinal cross-sectional view of the writing instrument of FIG. 13 in a writing state and with the front end facing upward. It is a perspective view of the knock lock member of the writing instrument of FIG. FIG. 14 is another perspective view of the knock lock member of the writing instrument of FIG. 13; It is a longitudinal cross-sectional view of the rear axis of the writing instrument of FIG. It is a rear view of the rear axis of the writing instrument of FIG. It is a schematic diagram which shows the switch from the non-writing state of the knock mechanism of the writing instrument of FIG. 13 to a writing state. It is a perspective view of the knock lock member of the writing instrument by 3rd Embodiment of this invention. FIG. 23 is another perspective view of the knock lock member of the writing instrument of FIG. 22; It is a longitudinal cross-sectional view of the back axis | shaft of the writing instrument by 3rd Embodiment of this invention. It is a rear view of the rear axis of the writing instrument of FIG. FIG. 10 is a side view showing a cover member of the erasing member according to another aspect. FIG. 27 is a longitudinal sectional view of the removal member of FIG. 26 with the cover member attached. It is a side view of the writing instrument by 4th Embodiment of this invention. FIG. 29 is a longitudinal cross-sectional view of the writing instrument of FIG. 28 in a non-writing state and with the front end facing upward. FIG. 29 is a longitudinal cross-sectional view of the writing instrument of FIG. 28 in the unwritten state and with the front end facing downward. FIG. 29 is a longitudinal sectional view of the writing instrument of FIG. 28 in a writing state and with the front end facing downward. It is an exploded view of the knock mechanism of the writing instrument of FIG. It is a side view of the rear axis of the writing instrument of FIG. It is a rear view of the rear axis of the writing instrument of FIG. It is sectional drawing in line AA of the rear axis of FIG. It is a perspective view of the knock lock member of the writing instrument of FIG. It is another perspective view of the knock lock member of the writing instrument of FIG. It is a schematic diagram which shows the switching from the non-writing state of the knock mechanism of the writing instrument of FIG. 28 to a writing state. It is a longitudinal cross-sectional view of the part of the erasing member of the writing instrument of FIG. It is a non-writing state of the writing instrument by 5th Embodiment of this invention, and a front end is a longitudinal cross-sectional view upwards. FIG. 41 is a longitudinal cross-sectional view of the writing instrument of FIG. 40 in the unwritten state and with the front end facing downward. FIG. 41 is a longitudinal cross-sectional view of a state where the front end of the writing instrument of FIG. 40 is knocking downward. FIG. 41 is a longitudinal sectional view of the writing instrument of FIG. 40 in a writing state and with the front end facing downward. FIG. 41 is a longitudinal sectional view of the writing instrument of FIG. 40 in a writing state and with the front end facing upward. FIG. 41 is an exploded view of the knock mechanism of the writing instrument of FIG. 40; It is a longitudinal cross-sectional view of the rear axis of the writing instrument of FIG. It is a front view of the inner cylinder of the writing instrument of FIG. It is sectional drawing in line B-B of the inner cylinder of FIG. It is a perspective view of the operation part of the writing instrument of FIG. It is a longitudinal cross-sectional view of the operation part of the writing instrument of FIG. FIG. 41 is a perspective view of the rotator of the writing instrument of FIG. 40. FIG. 41 is a perspective view of the knock lock member of the writing instrument of FIG. 40. FIG. 41 is another perspective view of the knock lock member of the writing instrument of FIG. 40; It is a side view of the front axis of the writing instrument of FIG. It is a perspective view of the erasing member of the writing instrument of FIG. It is a longitudinal cross-sectional view of the erasing member of the writing instrument of FIG. FIG. 41 is a schematic view showing the switching from the non-writing state to the writing state of the knock mechanism of the writing instrument of FIG. 40; FIG. 41 is a schematic view showing the switching from the writing state to the non-writing state of the knock mechanism of the writing instrument of FIG. 40; It is a longitudinal cross-sectional view in the non-writing state of the writing instrument by 6th Embodiment of this invention, and a front end is upwards. FIG. 60 is a longitudinal cross-sectional view of the writing instrument of FIG. 59 in the unwritten state and with the front end facing downward. FIG. 60 is a longitudinal sectional view of the writing instrument of FIG. 59 in a writing state and with the front end facing downward. FIG. 60 is a longitudinal sectional view of the writing instrument of FIG. 59 in a writing state and with the front end facing upward. FIG. 60 is an exploded view of the knock mechanism of the writing instrument of FIG. 59; It is a longitudinal cross-sectional view of the rear axis of the writing instrument of FIG. It is a perspective view of the operation part of the writing instrument of FIG. FIG. 60 is a perspective view of the rotator of the writing instrument of FIG. 59; FIG. 60 is a schematic view showing switching from a non-writing state to a writing state of the knock mechanism of the writing instrument of FIG. 59; FIG. 60 is a schematic view showing switching from the writing state to the non-writing state of the knock mechanism of the writing instrument of FIG. 59;

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Corresponding components are given the same reference numerals throughout the drawings.

  FIG. 1 is a longitudinal cross-sectional view of the writing instrument 1 according to the first embodiment of the present invention in a non-writing state and with the front end facing upward, and FIG. 2 is a longitudinal cross-section in the non-writing state of the writing instrument 1 of FIG. 3 is a plan view, FIG. 3 is a longitudinal cross-sectional view of the writing instrument 1 of FIG. 1 in a writing state and the front end is directed downward, and FIG. 4 is an exploded view of a knock mechanism 10 of the writing instrument 1 of FIG.

  The writing instrument 1 is formed in a cylindrical shape and has a barrel 4 having a front shaft 2 and a rear shaft 3, a refill 5 which is a writing body disposed in the barrel 4 and has a writing portion 5 a at one end, and a refill It has a spring 6 for biasing the member 5 rearward and a knock mechanism 10 disposed at the rear end of the barrel 4, that is, at the rear end of the rear shaft 3. The knock mechanism 10 has an inner cylinder 20, an operation unit 30, and a rotor 40, each of which is formed in a cylindrical shape. The front end portion of the front shaft 2 is formed in a tapered shape, and a through hole 2 a for causing the writing portion 5 a of the refill 5 to protrude is formed. The rear end portion of the front shaft 2 is inserted into the front end portion of the rear shaft 3 and is fitted by press fitting. The inner cylinder 20 may be formed integrally with the rear shaft 3. The front shaft 2 and the rear shaft 3 may be integrally formed.

  In the present specification, the inner cylinder 20, the front shaft 2 and the rear shaft 3 are generally referred to as a shaft cylinder. In the specification, the writing unit 5a side is defined as the "front" side in the axial direction of the writing instrument 1, and the opposite side to the writing unit 5a is defined as the "rear" side. Furthermore, in the writing instrument 1, the refill 5 is moved in the longitudinal direction in the barrel 4 by the knock mechanism 10. At this time, a state in which the writing unit 5a is immersed in the barrel 4 is referred to as a non-writing state (FIGS. 1 and 2), and a state in which the writing unit 5a protrudes from the barrel 4 is referred to as a writing state (FIG. 3). Furthermore, in FIGS. 1 to 3, the upper side is the vertically upper side, and the lower side is the vertically lower side. That is, gravity acts downward in each figure.

  A knock lock member 50 is disposed in front of the knock mechanism 10, that is, in front of the rotor 40 in the barrel 4. Therefore, in the barrel 4, the operation unit 30, the rotor 40 and the knock lock member 50 are arranged in order from the rear end side (FIG. 4).

  As described later, the knock lock member 50 can move in the longitudinal direction in the barrel 4 by gravity. Therefore, although FIG. 1 and FIG. 2 show the same non-writing state of the writing instrument 1, in FIG. 1, since the front end of the writing instrument 1, that is, the front end of the barrel 4 faces upward, the knock lock member 50 It is close to the rear end side in the barrel 4. On the other hand, in FIG. 2, since the front end of the writing instrument 1, that is, the front end of the barrel 4 is directed downward, the knock lock member 50 is closer to the front end in the barrel 4 compared to FIG. 1.

  FIG. 5 is a partial longitudinal sectional view of the inner cylinder 20 of the writing instrument 1 of FIG. In FIG. 5, the upper side is the front side of the writing instrument 1. Four outer cams 21 are provided on the inner surface of the inner cylinder 20 at equal intervals in the circumferential direction. The two adjacent outer cams 21 define four guide grooves 22 extending in the front-rear direction. Each of the outer cams 21 includes a first protrusion 23, a second protrusion 24, and a third protrusion 25 which extend in the front-rear direction and are arranged continuously in the circumferential direction. The second projection 24 disposed at the center has a radial thickness smaller than that of the first projection 23 and the third projection 25. Therefore, a recess in the radial direction is formed between the first protrusion 23 and the third protrusion 25, and the protrusion 31 of the operation unit 30 described later includes the first protrusion 23 and the third protrusion at both ends. And the second projection 24.

  FIG. 6 is a perspective view of the operation unit 30 of the writing instrument 1 of FIG. 1, a so-called knock bar. In FIG. 6, the upper side is the front side of the writing instrument 1. Eight protrusions 31 are provided at equal intervals in the circumferential direction on the outer peripheral surface on the front side of the operation unit 30. Each of the protrusions 31 is knocked into the outer cam 21, more specifically, in the recess between the first protrusion 23 and the third protrusion 25 or in the guide groove 22 between the outer cams 21. Is configured to move in the back and forth direction. In addition, a cam surface 32 is formed on the front end face of the operation unit 30. The cam surface 32 has eight peaks 33 and valleys 34.

  The operation unit 30 further includes a cylindrical erasing member 35 that functions as an erasing unit. The erasing member 35 is attached to the other parts by adhesion or two-color molding or the like. In other words, part of the operation unit 30 functions as the erasing unit.

  7 is a perspective view of the rotor 40 of the writing instrument 1 of FIG. In FIG. 7, the upper side is the front side of the writing instrument 1. The rotor 40 has a small diameter portion 41 inserted into the operation portion 30 and used for center alignment, an intermediate diameter portion 42 formed in front of the small diameter portion 41, and a large diameter formed in front of the intermediate diameter portion 42. And a diameter portion 43. The medium diameter portion 42 has a diameter larger than that of the small diameter portion 41, and the large diameter portion 43 has a diameter larger than that of the middle diameter portion 42. A cam receiving surface 44 having a shape complementary to the cam surface 32 of the operation unit 30 is formed on the rear end surface of the middle diameter portion 42. The cam receiving surface 44 has eight ridges 45 and valleys 46 similar to the cam surface 32 of the operation unit 30. On the outer peripheral surface of the middle diameter portion 42, four inner cams 47 extending in the front-rear direction are provided at equal intervals in the circumferential direction. The inner cam 47 engages with the outer cam 21 or is accommodated in the guide groove 22 between the outer cam 21 when the rotor 40 is circumferentially rotated by the knocking operation. When the inner cams 47 are accommodated in the guide grooves 22 between the outer cams 21, the outer cams 21 are accommodated in the grooves 48 between the inner cams 47.

  The cam surface 32 of the operation portion 30 and the cam receiving surface 44 of the rotor 40 are provided with a crest of the cam surface 32 when the inner cam 47 engages with the outer cam 21 or is accommodated in the guide groove 22 between the outer cams 21. The portion 33 is configured to be located on the slope between the adjacent peak portion 45 and the valley portion 46 of the cam receiving surface 44 in the circumferential direction. Therefore, when the inclined surface of the cam surface 32 presses the inclined surface of the cam receiving surface 44 by the knocking operation, the rotor 40 receives a component force in the circumferential direction and is circumferentially caused due to the operation load and the biasing force by the spring 6. Rotate. On the other hand, rotation of the operation portion 30 in the circumferential direction is restricted by the projection 31 coming into contact with the first projection 23 or the third projection 25 of the outer cam 21 in the circumferential direction.

  A cam surface 49 is formed on the front end face of the large diameter portion 43 of the rotor 40. The cam surface 49 has four peaks 49a and valleys 49b. More specifically, the ridge 49 a and the cam surface 49 have an inclined portion 49 c circumferentially inclined with respect to a plane perpendicular to the front-rear direction, and a vertical wall 49 d extending along the front-rear direction. A valley 49 b is configured. The ridges 49a of the cam surface 49 of the rotor 40 are different from the ridges 33 of the cam surface 32 of the operation unit 30, but they may be asymmetric as well.

  FIG. 8 is a perspective view of the knock lock member 50 of the writing instrument 1 of FIG. 1, and FIG. 9 is another perspective view of the knock lock member 50 of the writing instrument 1 of FIG. In FIGS. 8 and 9, the upper side is the front side of the writing instrument 1. The knock lock member 50 is a tubular member. The knock lock member 50 is penetrated by the refill 5 and is movable in the front-rear direction between a locking portion 60 described later and the rotor 40.

  A cam receiving surface 51 having a shape complementary to the cam surface 49 of the rotor 40 is formed on the rear end surface of the knock lock member 50. Similar to the cam surface 49 of the rotor 40, the cam receiving surface 51 has four peaks 51a and valleys 51b. That is, the cam receiving surface 51 of the knock lock member 50 has an inclined portion 51c circumferentially inclined with respect to a plane perpendicular to the longitudinal direction, and a vertical wall 51d extending along the longitudinal direction. A mountain portion 51a and a valley portion 51b are configured.

  The front end face of the knock lock member 50 has four corners 52 projecting forward as a first projection. The four corner portions 52 are provided at equal intervals in the circumferential direction. The corner 52 has a shape defined by a rectangular notch 53 formed rearward from the front end of the cylindrical member. At the tip of the corner portion 52, there is provided an inclined surface 54 which is inclined in the same direction as the inclined portion 51c of the cam receiving surface 51.

  10 is a longitudinal sectional view of the back shaft 3 of the writing instrument 1 of FIG. 1, and FIG. 11 is a rear view of the back shaft 3 of the writing instrument of FIG. In FIG. 10, the upper side is the front side of the writing instrument 1. The rear end of the rear shaft 3 is formed with a notch 3a that serves as a rotation stopper when the inner cylinder 20 is fitted by press fitting. Further, a locking portion 60 is provided at an intermediate portion of the inner surface of the rear shaft 3. The locking portion 60 has four protrusions 61 as second protrusions. The protrusions 61 extend in the front-rear direction and are equally spaced in the circumferential direction. Adjacent protrusions 61 define four guide grooves 62 extending in the front-rear direction.

  Recesses 63 in the circumferential direction are respectively formed on the side surface 61 a in the circumferential direction of the protrusion 61 of the locking portion 60, in particular on the side surface 61 a of the rear end portion. The inner surface on the front side of the recess 63 is an inclined surface 64 which is inclined in the circumferential direction with respect to a plane perpendicular to the front-rear direction. The bottom surface of the recess 63 is a side surface 65 parallel to the side surface 61 a in the circumferential direction of the protrusion 61. Therefore, the slope 64 is a slope connecting the side surface 61 a of the protrusion 61 and the side surface 65 of the recess 63 parallel thereto. A rear end surface 66 perpendicular to the front-rear direction is formed at the rear end portion of the projection 61 of the locking portion 60. The side surface 65 of the protrusion 61 plays a role of regulating rotation of the knock lock member 50 in the circumferential direction, and the rear end surface 66 of the protrusion 61 plays a role of regulating forward movement of the knock lock member 50.

  Each corner 52 of the knock lock member 50 is accommodated in the guide groove 62 of the corresponding locking portion 60 and moves back and forth in the guide groove 62. When the corner 52 of the knock lock member 50 is housed in the guide groove 62 of the locking portion 60, the protrusion 61 of the locking portion 60 is housed in the notch 53 of the knock lock member 50.

  The cam surface 49 of the rotor 40 and the cam receiving surface 51 of the knock lock member 50 form a peak of the cam surface 49 when the corner 52 of the knock lock member 50 is accommodated in the guide groove 62 of the locking portion 60. 49 a is configured to be positioned on the inclined portion 51 c of the cam receiving surface 51 in the circumferential direction. Therefore, for example, when the front end of the writing instrument 1 is directed upward as shown in FIG. 1, the knock lock member 50 abuts against the rotor 40 by the action of gravity, but due to its own weight, the knock lock member 50 receives a component of force in the circumferential direction and rotates in the circumferential direction. On the other hand, rotation of the rotor 40 in the circumferential direction is restricted by the inner cam 47 being accommodated in the guide groove 22.

  FIG. 12 is a schematic view showing switching of the knock mechanism 10 of the writing instrument 1 of FIG. 1 from the non-writing state to the writing state. That is, FIG. 12 is a schematic view showing the positional relationship among the outer cam 21, the operation unit 30, the rotor 40, and the knock lock member 50, where the outer cam 21 is expanded in the circumferential direction. The positions of the inner cam 47 and the cam surface 49, the cam receiving surface 51 and the corner 52 of the knock lock member 50, and the locking portion 60 of the rear shaft 3 are shown. In the figure, the upper side is the front side of the writing instrument 1 and the lower side is the rear side of the writing instrument 1.

  The rotor 40 is given a rotational force by the cam mechanism of the cam surface 32 of the operation unit 30 and the cam receiving surface 44 of the rotor 40 described above, and moves from left to right in the figure for each knock operation. In FIG. 12, for convenience, the first projection 23, the second projection 24, and the third projection 25 of the outer cam 21 are integrally shown, and the projection 31 of the operation unit 30 is omitted.

  FIG. 12A is a schematic view of the knock mechanism 10 in a non-writing state of the writing instrument 1 as shown in FIG. 1 and in a state in which the front end is upward. Therefore, gravity acts downward in the figure. At this time, the inner cam 47 of the rotor 40 biased rearward by the spring 6 via the refill 5 is accommodated in the guide groove 22 between the outer cams 21. Therefore, in this state, the writing unit 5 a is immersed in the barrel 4. Further, the cam surface 32 of the operation unit 30 and the cam receiving surface 44 of the rotor 40 are in mesh with each other.

  By directing the front end of the writing instrument 1 upward, the knock lock member 50 moves rearward and abuts on the rotor 40. As described above, the knock lock member 50 rotates in the circumferential direction by receiving a component of force in the circumferential direction caused by its own weight. That is, the cam surface 49 of the rotor 40 and the cam receiving surface 51 of the knock lock member 50 cooperate to rotate the knock lock member 50 in the circumferential direction. As a result of the rotation, the knock lock member 50 locks with the locking portion 60, and the forward movement of the rotor 40 and thus the operating portion 30 is blocked.

  Specifically, the corner 52 of the knock lock member 50 is accommodated in the recess 63 of the locking portion 60, whereby the knock locking member 50 and the locking portion 60 are locked. In other words, the recess 63 of the locking portion 60 is complementary to a portion of the corner 52 of the knock locking member 50 such that the corner 52 of the knock locking member 50 is accommodated in the recess 63 of the locking portion 60. It is configured to have a shape. Therefore, the slope 54 of the corner 52 has the same inclination as the slope 64 of the recess 63. In this state, even if the operation unit 30 is strongly pressed to move it forward, only the component force in the direction in which the corner 52 of the knock lock member 50 is accommodated in the recess 63 of the locking unit 60 becomes strong. The lock state is never released.

  FIG. 12B is a schematic view of the knock mechanism 10 in a non-writing state of the writing instrument 1 as shown in FIG. 2 and in a state in which the front end is downward. Therefore, gravity acts upward in the figure. By pointing the front end of the writing instrument 1 downward, the knock lock member 50 is free in relation to the rotor 40. On the other hand, the knock lock member 50 presses the locking portion 60 via the corner 52 by its own weight. That is, due to the weight of the knock lock member 50, the slope 54 of the corner 52 receives a component force in the circumferential direction from the slope 64 of the recess 63 of the locking portion 60. As a result, the knock lock member 50 rotates in the circumferential direction opposite to that in the case of FIG. 12A, and the corner 52 is guided into the guide groove 62. That is, the locked state between the knock lock member 50 and the locking portion 60 is released, and the rotor 40 and hence the operation portion 30 can be moved forward.

  FIG. 12C is a schematic view of the knock mechanism 10 in transition to the writing state of the writing instrument 1 and in a state in which the front end is downward. Therefore, gravity acts upward in the figure. When the operating portion 30 is pressed against the biasing force of the spring 6 and the operating portion 30 and the rotor 40 are moved forward, the rear end of the inner cam 47 is the front end of the outer cam 21, ie, 1 Protruding part 23 is exceeded. At this time, the cam surface 32 and the cam receiving surface 44 coincide with each other, and the restriction of the circumferential rotation of the rotor 40 by the side surface of the outer cam 21 is released. The knock lock member 50 does not block these operations.

  FIG. 12D is a schematic view of the knock mechanism 10 in the writing state of the writing instrument 1 as shown in FIG. 3 and in the state where the front end is downward. Therefore, gravity acts upward in the figure. When the pressing of the operation unit 30 is released from the state of FIG. 12 (c), the operation unit 30 and the rotor 40 are retracted by the biasing force of the spring 6. At this time, since rotation of the rotor 40 in the circumferential direction by the side surface of the outer cam 21 is not restricted, the rotor 40 receives a component force from the slope of the outer cam 21 and is circumferentially When rotating counterclockwise). That is, the inner cam 47 of the rotor 40 moves the inclined surface of the outer cam 21 until it abuts on the front end side surface of the third projection 25. As a result, the inner cam 47 engages with the outer cam 21 to prevent the backward movement, and the writing portion 5 a connected to the rotor 40 via the refill 5 is kept in a state of protruding from the barrel 4, Writing becomes possible.

  In the present embodiment, as described with reference to FIG. 12A in particular, the forward movement of the operation unit 30 is blocked in the non-writing state and the front end is in the upward state, and the knocking operation can not be performed. Therefore, for example, when erasing the handwriting by the writing instrument 1 using the erasing member 35 of the operation unit 30, it is possible to perform a stable rubbing operation. That is, even if the writing tool 1 is changed and the operation unit 30 is pressed against the writing surface to perform the rubbing operation, the operation unit 30 does not rattle.

  13 is a longitudinal cross-sectional view of the writing instrument 100 according to the second embodiment of the present invention in the non-writing state and with the front end facing upward, and FIG. 14 is a longitudinal cross-section in the non-writing state of the writing instrument 100 of FIG. It is a front view. 15 is a longitudinal cross-sectional view of the writing instrument 100 of FIG. 13 in the writing state and with the front end facing downward, and FIG. 16 is a longitudinal cross-sectional view in the writing state of the writing instrument 100 of FIG.

  The writing instrument 100 according to the present embodiment differs from the shapes of the knock locking member 50 and the locking portion 60 of the writing instrument 1 according to the first embodiment only in the shapes of the knock locking member 150 and the locking portion 160. Therefore, only differences from the first embodiment will be described in the present embodiment. Also in FIGS. 13 to 16, the upper side is the vertical upper side, and the lower side is the vertical lower side. That is, gravity acts downward in each figure.

  The knock lock member 150 is movable in the front-rear direction in the barrel 4 by gravity. Therefore, although FIG. 13 and FIG. 14 show the same non-writing state of the writing instrument 100, since the front end of the writing instrument 100, that is, the front end of the barrel 4 is upward in FIG. It is close to the rear end side in the barrel 4. On the other hand, in FIG. 14, since the front end of the writing instrument 100, that is, the front end of the barrel 4 is directed downward, the knock lock member 150 is closer to the front end in the barrel 4 compared to FIG. Similarly, FIGS. 15 and 16 show the same writing state of the writing instrument 100, but in FIG. 15, since the front end of the writing instrument 100, that is, the front end of the barrel 4 is directed downward, the knock lock member 150 It is close to the front end side in the barrel 4. On the other hand, in FIG. 16, since the front end of the writing instrument 100, that is, the front end of the barrel 4 is upward, the knock lock member 150 is closer to the rear end in the barrel 4 compared to FIG.

  FIG. 17 is a perspective view of the knock lock member 150 of the writing instrument 100 of FIG. 13, and FIG. 18 is another perspective view of the knock lock member 150 of the writing instrument 100 of FIG. In FIGS. 17 and 18, the upper side is the front side of the writing instrument 100. The knock lock member 150 is a tubular member. The knock lock member 150 is penetrated by the refill 5 and is movable in the front-rear direction between a locking portion 160 described later and the rotor 40.

  A cam receiving surface 151 having a shape complementary to the cam surface 49 of the rotor 40 is formed on the rear end surface of the knock lock member 150. Similar to the cam surface 49 of the rotor 40, the cam receiving surface 151 has four peaks 151a and valleys 151b. That is, the cam receiving surface 151 of the knock lock member 150 has an inclined portion 151c circumferentially inclined with respect to a plane perpendicular to the longitudinal direction, and a vertical wall 151d extending along the longitudinal direction. A mountain portion 151a and a valley portion 151b are configured.

  The front end face of the knock lock member 150 has two corner portions 152 projecting forward as a first projection. The two corner portions 152 are provided at equal intervals in the circumferential direction. Also, the corner portion 152 has a shape defined by a rectangular notch 153 formed rearward from the front end of the cylindrical member. At the tip of the corner portion 152, there is provided an inclined surface 154 which is inclined in the same direction as the inclined portion 151c of the cam receiving surface 151.

  FIG. 19 is a longitudinal sectional view of the back shaft 3 of the writing instrument 100 of FIG. 13, and FIG. 20 is a rear view of the back shaft 3 of the writing instrument of FIG. In FIG. 19, the upper side is the front side of the writing instrument 1. A locking portion 160 is provided at an intermediate portion of the inner surface of the rear shaft 3. The locking portion 160 has two protrusions 161 as second protrusions. The protrusions 161 extend in the front-rear direction and are equally spaced in the circumferential direction. Adjacent protrusions 161 define two guide grooves 162 extending in the front-rear direction.

  A first recessed portion 163 in the circumferential direction is formed on the side surface 161a in the circumferential direction of the protrusion 161 of the locking portion 160, particularly on the side surface 161a at the rear end. Furthermore, in the side surface 161a in the circumferential direction of the protrusion 161 of the locking portion 160 in front of the first recess 163, a circumferential second recess 164 is formed. That is, the first recess 163 and the second recess 164 are spaced apart in the front-rear direction. The bottom surface of the first recess 163 is a side surface 165 parallel to the side surface 161 a in the circumferential direction of the protrusion 161, and the bottom surface of the second recess 164 is a side surface 166 parallel to the side surface 161 a in the circumferential direction of the protrusion 161. The inner surface on the front side of the first recess 163 is a first inclined surface 167 inclined in the circumferential direction with respect to a plane perpendicular to the front-rear direction, and the inner surface on the front side of the second recess 164 is perpendicular to the front-rear direction Is a second inclined surface 168 which is inclined in the circumferential direction with respect to the flat plane. The first concave portion 163 and the second concave portion 164 are formed in a step shape as viewed from the rear of the protrusion 161 toward the front. Further, a rear end face 169 perpendicular to the front-rear direction is formed at the rear end of the projection 161 of the locking part 160. The side surface 165 and the side surface 166 of the projection portion 161 play a role of restricting the circumferential rotation of the knock lock member 150, and the rear end surface 169 of the projection portion 161 plays a role of restricting forward movement of the knock lock member 150. .

  Each corner 152 of the knock lock member 150 is accommodated in the guide groove 162 of the corresponding locking portion 160 and moves back and forth in the guide groove 162. When the corner 152 of the knock lock member 150 is housed in the guide groove 162 of the locking portion 160, the projection 161 of the locking portion 160 is housed in the notch 153 of the knock lock member 150.

  The cam surface 49 of the rotor 40 and the cam receiving surface 151 of the knock lock member 150 form a peak of the cam surface 49 when the corner 152 of the knock lock member 150 is accommodated in the guide groove 162 of the locking portion 160. 49 a is configured to be positioned on the inclined portion 151 c of the cam receiving surface 151 in the circumferential direction. Therefore, for example, when the front end of the writing instrument 100 is directed upward as shown in FIG. 13 and FIG. 16, the knock lock member 150 abuts against the rotor 40 by the action of gravity, but due to the dead weight of the knock lock member 150 The knock lock member 150 rotates in the circumferential direction by receiving a component force in the circumferential direction. On the other hand, rotation of the rotor 40 in the circumferential direction is restricted by the inner cam 47 engaging with the outer cam 21 or being accommodated in the guide groove 22.

  FIG. 21 is a schematic view showing switching of the knock mechanism 10 of the writing instrument of FIG. 13 from the non-writing state to the writing state. FIG. 21 is a schematic view similar to FIG. 12, in which the upper side is the front side of the writing instrument 100 and the lower side is the rear side of the writing instrument 100.

  FIG. 21A is a schematic view of the knock mechanism 10 in a non-writing state of the writing instrument 100 as shown in FIG. 13 and in a state where the front end is upward. Therefore, gravity acts downward in the figure. At this time, the inner cam 47 of the rotor 40 biased rearward by the spring 6 via the refill 5 is accommodated in the guide groove 22 between the outer cams 21. Therefore, in this state, the writing unit 5 a is immersed in the barrel 4. Further, the cam surface 32 of the operation unit 30 and the cam receiving surface 44 of the rotor 40 are in mesh with each other.

  By directing the front end of the writing instrument 100 upward, the knock lock member 150 moves rearward and abuts on the rotor 40. As described above, the knock lock member 150 rotates in the circumferential direction by receiving a component of force in the circumferential direction caused by its own weight. That is, the cam surface 49 of the rotor 40 and the cam receiving surface 151 of the knock lock member 150 cooperate to rotate the knock lock member 150 in the circumferential direction. As a result of the rotation, the knock lock member 150 locks with the locking portion 160 and the forward movement of the rotor 40 and thus the operating portion 30 is blocked.

  Specifically, the corner portion 152 of the knock lock member 150 is accommodated in the first recess 163 of the lock portion 160, whereby the knock lock member 150 and the lock portion 160 are locked. In other words, in the non-writing state, the first concave portion 163 of the locking portion 160 is of the knock locking member 150 such that the corner portion 152 of the knock locking member 150 is accommodated in the first concave portion 163 of the locking portion 160. It is configured to have a shape complementary to a part of the corner 152. Therefore, the slope 154 of the corner 152 has the same inclination as the first slope 167 of the first recess 163. In this state, even if the operation portion 30 is strongly pressed and moved forward, the component force in the direction in which the corner portion 152 of the knock lock member 150 is accommodated in the first recess portion 163 of the locking portion 160 becomes strong. The lock state is not released.

  FIG. 21B is a schematic view of the knock mechanism 10 in a non-writing state of the writing instrument 100 as shown in FIG. 14 and in a state where the front end is directed downward. Therefore, gravity acts upward in the figure. By pointing the front end of the writing instrument 100 downward, the knock lock member 150 is free in relation to the rotor 40. On the other hand, knock lock member 150 presses locking portion 160 via corner portion 152 by its own weight. That is, due to the weight of knock lock member 150, slope 154 of corner 152 receives a component force in the circumferential direction from first slope 167 of first recess 163 of locking portion 160. As a result, the knock lock member 150 rotates in the circumferential direction opposite to that in the case of FIG. 21A, and the corner portion 152 is guided into the guide groove 162. That is, the locked state between the knock lock member 150 and the locking portion 160 is released, and the rotor 40 and hence the operation portion 30 can be moved forward.

  FIG. 21C is a schematic view of the knock mechanism 10 in transition to the writing state of the writing instrument 100 and in a state where the front end is downward. Therefore, gravity acts upward in the figure. When the operating portion 30 is pressed against the biasing force of the spring 6 and the operating portion 30 and the rotor 40 are moved forward, the rear end of the inner cam 47 is the front end of the outer cam 21, ie, 1 Protruding part 23 is exceeded. At this time, the cam surface 32 and the cam receiving surface 44 coincide with each other, and the restriction of the circumferential rotation of the rotor 40 by the side surface of the outer cam 21 is released. The knock lock member 150 does not block these operations.

  FIG. 21D is a schematic view of the knock mechanism 10 in the writing state of the writing instrument 100 as shown in FIG. 15 and with the front end facing downward. Therefore, gravity acts upward in the figure. When the pressing of the operation unit 30 is released from the state of FIG. 21C, the operation unit 30 and the rotor 40 are retracted by the biasing force of the spring 6. At this time, since rotation of the rotor 40 in the circumferential direction by the side surface of the outer cam 21 is not restricted, the rotor 40 receives a component force from the slope of the outer cam 21 and is circumferentially When rotating counterclockwise). That is, the inner cam 47 of the rotor 40 moves the inclined surface of the outer cam 21 until it abuts on the front end side surface of the third projection 25. As a result, the inner cam 47 engages with the outer cam 21 to prevent the backward movement, and the writing portion 5 a connected to the rotor 40 via the refill 5 is kept in a state of protruding from the barrel 4, Writing becomes possible.

  FIG. 21E is a schematic view of the knock mechanism 10 in the writing state of the writing instrument 100 as shown in FIG. 16 and in the state where the front end is upward. Therefore, gravity acts downward in the figure. By turning the front end of the writing instrument 100 upward, the knock lock member 150 moves rearward and abuts the rotor 40 again. As described above, the knock lock member 150 rotates in the circumferential direction by receiving a component of force in the circumferential direction caused by its own weight. That is, the cam surface 49 of the rotor 40 and the cam receiving surface 151 of the knock lock member 150 cooperate to rotate the knock lock member 150 in the circumferential direction. As a result of the rotation, the knock lock member 150 locks with the locking portion 160 and the forward movement of the rotor 40 and thus the operating portion 30 is blocked.

  Specifically, the corner portion 152 of the knock lock member 150 is accommodated in the second recess 164 of the lock portion 160, whereby the knock lock member 150 and the lock portion 160 are locked. In other words, in the writing state, the second recess 164 of the locking portion 160 is a corner of the knock locking member 150 such that the corner 152 of the knock locking member 150 is accommodated in the second recess 164 of the locking portion 160. It is configured to have a shape complementary to a part of the portion 152. Therefore, the slope 154 of the corner 152 has the same inclination as the second slope 168 of the second recess 164. In this state, even if the operation portion 30 is strongly pressed to move it forward, the component force in the direction in which the corner 52 of the knock lock member 50 is accommodated in the first recess 163 of the locking portion 60 becomes stronger The lock state is not released.

  The locking state between the knock lock member 150 and the locking portion 160 via the second recess 164 is released by the front end of the writing instrument 100 facing downward as in the case of the first recess 163. . By performing the knock operation in that state, the writing instrument 100 can be switched from the writing state to the non-writing state.

  In the present embodiment, as described in the first embodiment, forward movement of the operation unit 30 is blocked in the non-writing state and the front end is in the upward state, and in the writing state Forward movement is blocked. Therefore, for example, at the time of erasing the handwriting by the writing instrument 100 using the erasing member 35 of the operation unit 30, it is possible to perform a stable rubbing operation whether the writing instrument 100 is in the writing state or in the non-writing state Become. That is, even if the user changes the writing instrument 100 and presses the operation unit 30 against the writing surface to perform the rubbing operation, the operation unit 30 does not always rattle.

  22 to 25 are parts of a writing instrument according to a third embodiment of the present invention. The writing instrument according to the present embodiment differs from the writing instrument 1 according to the first embodiment in the shapes of the knock lock member 250, the locking portion 260, and the cam surface 49 of the rotor 40 corresponding to the knock lock member 250. Therefore, only differences from the first embodiment will be described in the present embodiment.

  FIG. 22 is a perspective view of a knock lock member 250 of a writing instrument according to a third embodiment of the present invention, and FIG. 23 is another perspective view of the knock lock member 250 of the writing instrument of FIG. In FIGS. 22 and 23, the upper side is the front side of the writing instrument. The knock lock member 250 is a tubular member. The knock lock member 250 is penetrated by the refill 5 and is movable in the front-rear direction between a locking portion 260 described later and the rotor 40.

  A cam receiving surface 251 having a shape complementary to the cam surface 49 of the rotor 40 is formed on the rear end surface of the knock lock member 250. The cam receiving surface 251 has three peaks 251a and valleys 251b. That is, the cam receiving surface 251 of the knock lock member 250 has an inclined portion 251c circumferentially inclined with respect to a plane perpendicular to the front-rear direction, and a vertical wall 251d extending along the front-rear direction. A mountain portion 251 a and a valley portion 251 b are configured. Similarly, the cam surface of the corresponding rotor 40 has three peaks 49a and valleys 49b.

  On the outer peripheral surface on the front side of the knock lock member 250, there are provided three corner portions 252 projecting forward. The three corner portions 252 are provided at equal intervals in the circumferential direction. The corner 252 has a shape defined by a rectangular notch 253 formed rearward from the front end of the cylindrical member. At the tip of the corner portion 252, an inclined surface 254 inclined in the same direction as the inclined portion 251c of the cam receiving surface 251 is provided.

  The three corner portions 252 are connected by a cylindrical portion 255 formed in a cylindrical shape projecting forward from the front end surface of the knock lock member 250. That is, the cylindrical portion 255 is arranged such that its outer surface abuts on the inner surfaces of the three corner portions 252. In other words, the corner 252 is a first protrusion that protrudes from the outer peripheral surface of the cylindrical portion 255. Further, the outer diameter of the cylindrical portion 255 is smaller than the inner diameter of a locking portion 260 described later. Since the cylindrical portion 255 connects the three corner portions 252, it plays a role of reinforcing the corner portion 252. As a result, the durability of the corner 252 to repeated operation over a long period of time can be improved.

  FIG. 24 is a longitudinal sectional view of the back shaft 3 of the writing instrument according to the third embodiment of the present invention, and FIG. 25 is a rear view of the back shaft 3 of the writing instrument of FIG. In FIG. 24, the upper side is the front side of the writing instrument. The rear end of the rear shaft 3 is formed with a notch 3a that serves as a rotation stopper when the inner cylinder 20 is fitted by press fitting. Further, a locking portion 260 is provided at an intermediate portion of the inner surface of the rear shaft 3. The locking portion 260 has three protrusions 261 as second protrusions. The protrusions 261 extend in the front-rear direction and are equally spaced in the circumferential direction. Adjacent protrusions 261 define three guide grooves 262 extending in the front-rear direction.

  At a rear end portion of the projection portion 261 of the locking portion 260, an inclined surface 263 which is inclined in the circumferential direction with respect to a plane perpendicular to the front-rear direction is formed. The inclined surface 263 can be engaged with the corner 252 of the knock lock member 250, for example, similarly to the recess 63 in the first embodiment. Therefore, the slope 263 plays a role in regulating the forward movement of the knock lock member 250.

  Each corner 252 of the knock lock member 250 is accommodated in the guide groove 262 of the corresponding locking portion 260 and moves back and forth in the guide groove 262. When the corner 252 of the knock lock member 250 is housed in the guide groove 262 of the locking portion 260, the protrusion 261 of the locking portion 260 is housed in the notch 253 of the knock lock member 250. As described above, since the outer diameter of the cylindrical portion 255 is smaller than the inner diameter of the locking portion 260, the movement of the corner portion 252 of the knock lock member 250 is not impeded.

  In the writing instrument according to the present embodiment, compared with the writing instrument 1 according to the first embodiment, although the recess is not formed in the locking portion 260, writing from the non-writing state of the knock mechanism 10 is achieved by having the corresponding slope 263. The switching to the state is similar to the aspect described with reference to FIG. Therefore, in the non-writing state and in the state where the front end is upward, the forward movement of the operation unit 30 is blocked, and the knocking operation can not be performed. Therefore, for example, when the handwriting is erased by the writing instrument using the erasing member 35 of the operation unit 30, it is possible to perform a stable rubbing operation. That is, even if the user changes the writing tool and presses the operation unit 30 against the writing surface to perform the rubbing operation, the operation unit 30 does not rattle.

  FIG. 26 is a side view showing the cover member 70 of the erasing member 135 according to another aspect, and FIG. 27 is a longitudinal cross-sectional view of the erasing member 135 of FIG. The erasing member 135 and the cover member 70 are applicable to the writing instrument according to any of the above-described embodiments.

  The erasing member 135 has an outer diameter smaller than that of the erasing member 35 according to the aspect described above. That is, the erasing member 135 is formed in a cylindrical shape having an outer diameter smaller than the outer diameter of the operation unit 30. The erasing member 135 is attached to the rear end portion of the operation unit 30 by adhesion or two-color molding or the like. Moreover, the tip is formed hemispherical.

  The cover member 70 is a cylindrical cap member having an outer diameter substantially the same as the outer diameter of the operation portion 30 and having a closed rear end. The inner diameter of the cover member 70 is set to be substantially the same as or slightly smaller than the outer diameter of the erasing member 135. Therefore, the cover member 70 can be detachably attached to the erasing member 135. Since the erasing member 135 is covered by the cover member 70 except when used, it is possible to prevent the contamination of the erasing member 135.

  28 is a side view of a writing instrument 300 according to a fourth embodiment of the present invention, FIG. 29 is a longitudinal cross-sectional view of the writing instrument 300 of FIG. FIG. 31 is a longitudinal cross-sectional view of the writing instrument 300 of FIG. 28 in a non-writing state and with the front end facing downward, and FIG. 31 is a longitudinal cross-sectional view in a writing state of the writing instrument 300 of FIG. FIG. 32 is an exploded view of the knock mechanism of the writing instrument 300 of FIG.

  The writing instrument 300 according to the present embodiment has the back shaft 303, the inner cylinder 20, the operation unit 330, the knock lock member 350 and the erasing member 335 in the shape of the back shaft 3, the inner cylinder 20, the operation unit of the writing instrument 100 according to the second embodiment. 30, the shapes of the knock lock member 150 and the erasing member 35 are largely different. That is, this embodiment has a configuration in which the roles of the first projection of the knock lock member and the second projection of the locking portion in the above-described embodiment are reversed. The other configuration of the writing instrument 300 according to the fourth embodiment is substantially the same as the writing instrument 100 according to the second embodiment. For example, although the inner cylinder 20 has the clip 20a, it has an outer cam on the inner surface like the inner cylinder 20 of the writing instrument 100 according to the second embodiment. Therefore, only the points that are greatly different from the second embodiment will be described in the present embodiment. In FIG. 29 to FIG. 31, the upper side is the vertical upper side, and the lower side is the vertical lower side. That is, gravity acts downward in each figure.

  The knock lock member 350 is movable in the front-rear direction in the barrel 4 by gravity. Therefore, although FIGS. 29 and 30 show the same non-writing state of the writing instrument 300, in FIG. 29, since the front end of the writing instrument 300, that is, the front end of the barrel 4 is upward, the knock lock member 350 It is close to the rear end side in the barrel 4. On the other hand, in FIG. 30, since the front end of the writing instrument 300, that is, the front end of the barrel 4 is downward, the knock lock member 350 is closer to the front end in the barrel 4 as compared with FIG. FIG. 31 shows the writing state of the writing instrument 300. Since the front end of the writing instrument 300, that is, the front end of the barrel 4 is downward, the knock lock member 350 is close to the front end in the barrel 4.

  33 is a side view of the back shaft 303 of the writing instrument 300 of FIG. 28, FIG. 34 is a back view of the back shaft 303 of the writing instrument 300 of FIG. 28, and FIG. 35 is a line of the back shaft 302 of FIG. It is sectional drawing in AA. In FIGS. 33 and 35, the upper side is the front side of the writing instrument 300. At the rear end of the rear shaft 303, a notch 303a is formed which serves as a rotation stopper when the inner cylinder 20 is fitted by press fitting. Further, a locking portion 360 is provided at an intermediate portion of the inner surface of the rear shaft 303. The locking portion 360 has four second protrusions 361 arranged at equal intervals in the circumferential direction. The second protrusion 361 has a parallelogram in cross section. The rear end surface of the second protrusion 361 is an inclined surface 362 which is inclined in the circumferential direction with respect to a plane perpendicular to the front-rear direction.

  One window portion 303 b is formed on the side surface of the rear shaft 303 behind the second protrusion 361 so that the inside of the shaft cylinder 4 can be visually recognized from the outside. In the present embodiment, the window portion 303 b is a rectangular through hole, but may not be a through hole as long as the inside is visible, and may be formed of a partially transparent or translucent material . That is, after the shaft cylinder 4 is formed of a transparent material, the window portion 303b may be formed by coating or film winding so as to leave the portion of the window portion 303b. Further, the shape and the number of the windows 303 b can be set arbitrarily. Furthermore, the shaft cylinder 4 and the portion of the knock lock member 350 visible through the window portion 303b may be formed in different colors. Of course, the configuration of the window portion 303b is applicable to the above-described embodiment.

  Since the writing instrument 300 has the window portion 303b, the knock lock member 350 can be visually recognized through the window portion 303b, and the position of the knock lock member 350 can be easily confirmed. That is, the knock lock member 350 can be visually recognized through the window portion 303b when the knock lock member 350 is close to the rear end in the shaft cylinder 4 and through the window portion 303b when the knock lock member 350 is close to the front end I can not see it. Alternatively, the knock lock member 350 can be visually recognized through the window portion 303b when the knock lock member 350 is in the barrel 4 near the front end, and when the knock lock member 350 is in the barrel 4 near the rear end It may not be visible through the screen. This makes it easy to determine whether or not a stable rubbing operation is possible. That is, when the knock lock member 350 can be visually recognized through the window portion 303b, a stable scraping operation can be performed, and when the knock lock member 350 can not be visually recognized, a stable scraping operation can not be performed. In addition, the structure which forms a window part so that an inside can be visually recognized with respect to the axial cylinder 4 as a matter of course is applicable also in another embodiment.

  FIG. 36 is a perspective view of the knock lock member 350 of the writing instrument 300 of FIG. 28 and FIG. 37 is another perspective view of the knock lock member 350 of the writing instrument 300 of FIG. In FIGS. 36 and 37, the upper side is the front side of the writing instrument 300. The knock lock member 350 is a tubular member. The knock lock member 350 is penetrated by the refill 5 and is movable in the front-rear direction between the locking portion 360 and the rotor 40.

  A cam receiving surface 351 having a shape complementary to the cam surface 49 of the rotor 40 is formed on the rear end surface of the knock lock member 350. Similar to the cam surface 49 of the rotor 40, the cam receiving surface 351 has four peaks 351a and valleys 351b. That is, the cam receiving surface 351 of the knock lock member 350 has an inclined portion 351c circumferentially inclined with respect to a plane perpendicular to the longitudinal direction, and a vertical wall portion 351d extending along the longitudinal direction. A mountain portion 351a and a valley portion 351b are configured.

  On the outer peripheral surface of the cylindrical portion 350a of the knock lock member 350, four first protrusions 352 similar in shape to the protrusions 161 provided on the back shaft 3 of the writing instrument 100 according to the second embodiment are provided. The first protrusions 352 extend in the front-rear direction and are equally spaced in the circumferential direction. The adjacent first protrusions 352 define four guide grooves 353 extending in the front-rear direction.

  First concave portions 354 in the circumferential direction are respectively formed on the side surface 352 a in the circumferential direction of the first protrusion 352, particularly on the side surface 352 a of the front end. Furthermore, in the side surface 352 a in the circumferential direction of the first protrusion 352 rearward of the first recess 354, a circumferential second recess 355 is formed. That is, the first concave portion 354 and the second concave portion 355 are spaced apart in the front-rear direction. The bottom surface of the first recess 354 is a side surface 356 parallel to the side surface 352 a in the circumferential direction of the first protrusion 352, and the bottom surface of the second recess 355 is a side surface parallel to the side surface 352 a in the circumferential direction of the first protrusion 352 357. The inner surface on the rear side of the first recess 354 is a first inclined surface 358 inclined in the circumferential direction with respect to a plane perpendicular to the front-rear direction, and the inner surface on the rear side of the second recess 355 is The second slope 359 is inclined in the circumferential direction with respect to the vertical plane. The first recess 354 and the second recess 355 are formed in a step-like shape as viewed from the front of the first protrusion 352 toward the rear. The side surface 356 and the side surface 357 of the first protrusion 352 play the role of restricting circumferential rotation of the knock lock member 350.

  Each of the guide grooves 353 of the knock lock member 350 accommodates therein the second projection 361 of the locking portion 360 of the corresponding rear shaft 303, and allows relative movement of the inside of the guide groove 353 back and forth There is.

  The cam surface 49 of the rotor 40 and the cam receiving surface 351 of the knock lock member 350 are located on the cam surface 49 when the second projection 361 of the locking portion 360 is accommodated in the guide groove 353 of the knock lock member 350. The ridge portion 49 a is configured to be positioned on the inclined portion 351 c of the cam receiving surface 351 in the circumferential direction. Therefore, for example, when the front end of the writing instrument 300 is directed upward as shown in FIG. 29, the knock lock member 350 abuts against the rotor 40 by the action of gravity, but due to its own weight, the knock lock member 350 receives a component of force in the circumferential direction and rotates in the circumferential direction. On the other hand, rotation of the rotor 40 in the circumferential direction is restricted by the inner cam 47 engaging with the outer cam 21 or being accommodated in the guide groove 22.

  FIG. 38 is a schematic view showing switching of the knock mechanism 10 of the writing instrument 300 of FIG. 28 from the non-writing state to the writing state. FIG. 38 is a schematic view similar to FIG. 12, in which the upper side is the front side of the writing instrument 300 and the lower side is the rear side of the writing instrument 300.

  FIG. 38 (a) is a schematic view of the knock mechanism 10 in a non-writing state of the writing instrument 300 as shown in FIG. 29 and in a state where the front end is upward. Therefore, gravity acts downward in the figure. At this time, the inner cam 47 of the rotor 40 biased rearward by the spring 6 via the refill 5 is accommodated in the guide groove 22 between the outer cams 21. Therefore, in this state, the writing unit 5 a is immersed in the barrel 4. Further, the cam surface 32 of the operation portion 330 and the cam receiving surface 44 of the rotor 40 are in mesh with each other.

  By directing the front end of the writing instrument 300 upward, the knock lock member 350 moves rearward and abuts on the rotor 40. As described above, the knock lock member 350 rotates in the circumferential direction by receiving a component of force in the circumferential direction caused by its own weight. That is, the cam surface 49 of the rotor 40 and the cam receiving surface 351 of the knock lock member 350 cooperate to rotate the knock lock member 350 in the circumferential direction. As a result of the rotation, the knock lock member 350 locks with the locking portion 360, and the forward movement of the rotor 40 and thus the operating portion 330 is blocked.

  Specifically, the second projection 361 of the locking portion 360 is accommodated in the first recess 354 of the first protrusion 352 of the knock lock member 350, whereby the knock lock member 350 and the locking portion 360 are formed. It becomes locked state. In other words, in the non-writing state, the first recess 354 is locked so that the second protrusion 361 of the locking portion 360 is accommodated in the first recess 354 of the first protrusion 352 of the knock lock member 350. It is configured to have a shape complementary to a portion of the second protrusion 361 of the portion 360. Therefore, the slope 362 of the second protrusion 361 has the same inclination as the first slope 358 of the first recess 354. In this state, even if the operation portion 330 is strongly pressed and moved forward, the component force in the direction in which the second projection 361 of the locking portion 360 is accommodated in the first recess 354 of the knock lock member 350 is It only strengthens and does not release the locked state.

  FIG. 38 (b) is a schematic view of the knock mechanism 10 in a non-writing state of the writing instrument 300 as shown in FIG. 30 and in a state where the front end is directed downward. Therefore, gravity acts upward in the figure. By pointing the front end of the writing instrument 300 downward, the knock lock member 350 is free in relation to the rotor 40. On the other hand, the knock lock member 350 presses the locking portion 360 via the first protrusion 352 by its own weight. That is, due to the weight of the knock lock member 350, the first slope 358 of the first recess 354 of the first protrusion 352 receives a component force in the circumferential direction from the slope 362 of the second protrusion 361 of the locking portion 360. . As a result, the knock lock member 350 rotates in the circumferential direction opposite to that in FIG. 38A, and the second protrusion 361 is guided into the guide groove 353. That is, the locked state of the knock lock member 350 and the locking portion 360 is released, and the rotor 40 and hence the operation portion 330 can be moved forward. The forward movement of the knock lock member 350 is stopped by the rear end surface of the front shaft 2.

  FIG. 38C is a schematic view of the knock mechanism 10 in transition to the writing state of the writing instrument 300 and in a state where the front end is directed downward. Therefore, gravity acts upward in the figure. When the operating portion 330 is pressed against the biasing force of the spring 6 and the operating portion 330 and the rotor 40 are moved forward, the rear end of the inner cam 47 is the front end of the outer cam 21, ie, 2 The protrusion 361 is exceeded. At this time, the cam surface 32 and the cam receiving surface 44 coincide with each other, and the restriction of the circumferential rotation of the rotor 40 by the side surface of the outer cam 21 is released. The knock lock member 350 does not block these operations.

  FIG. 38D is a schematic view of the knock mechanism 10 in the writing state of the writing instrument 300 as shown in FIG. 31 and with the front end facing downward. Therefore, gravity acts upward in the figure. When the pressing of the operation unit 330 is released from the state of FIG. 38 (c), the operation unit 330 and the rotor 40 are retracted by the biasing force of the spring 6. At this time, since rotation of the rotor 40 in the circumferential direction by the side surface of the outer cam 21 is not restricted, the rotor 40 receives a component force from the slope of the outer cam 21 and is circumferentially When rotating counterclockwise). That is, the inner cam 47 of the rotor 40 moves the inclined surface of the outer cam 21 until it abuts on the front end side surface of the third projection 25. As a result, the inner cam 47 engages with the outer cam 21 to prevent the backward movement, and the writing portion 5 a connected to the rotor 40 via the refill 5 is kept in a state of protruding from the barrel 4, Writing becomes possible.

  FIG. 38E is a schematic view of the knock mechanism 10 in a writing state of the writing tool 300 and in a state where the front end is upward (not shown but similar to FIG. 16). Therefore, gravity acts downward in the figure. By turning the front end of the writing instrument 300 upward, the knock lock member 350 moves rearward and abuts the rotor 40 again. As described above, the knock lock member 350 rotates in the circumferential direction by receiving a component of force in the circumferential direction caused by its own weight. That is, the cam surface 49 of the rotor 40 and the cam receiving surface 351 of the knock lock member 350 cooperate to rotate the knock lock member 350 in the circumferential direction. As a result of the rotation, the knock lock member 350 locks with the locking portion 360, and the forward movement of the rotor 40 and thus the operating portion 330 is blocked.

  Specifically, the second projection 361 of the locking portion 360 is accommodated in the second recess 355 of the first protrusion 352 of the knock lock member 350, whereby the knock lock member 350 and the locking portion 360 are formed. It becomes locked state. In other words, in the writing state, the second recess 355 is a locking portion so that the second protrusion 361 of the locking portion 360 is accommodated in the second recess 355 of the first protrusion 352 of the knock lock member 350. It is configured to have a shape complementary to a portion of the second protrusion 361 of 360. Therefore, the slope 362 of the second protrusion 361 has the same inclination as the second slope 359 of the second recess 355. In this state, even if the operation portion 330 is strongly pressed and moved forward, the component force in the direction in which the second projection 361 of the locking portion 360 is accommodated in the second recess 355 of the knock lock member 350 is It only strengthens and does not release the locked state.

  The locking state between the knocking lock member 350 and the locking portion 360 via the second recess 355 is released by the front end of the writing instrument 300 facing downward, as in the case of the first recess 354. . By performing the knock operation in that state, the writing instrument 300 can be switched from the writing state to the non-writing state.

  In the present embodiment, as described in the second embodiment, forward movement of the operation unit 330 is blocked if the front end is in the upward state in both the non-writing state and the writing state. Therefore, for example, at the time of erasing the handwriting by the writing instrument 300 using the erasing member 335 of the operation unit 330, it is possible to perform a stable rubbing operation regardless of whether the writing instrument 300 is in the writing state or in the non-writing state. Become. That is, even if the user changes the writing instrument 300 and presses the operation unit 330 against the writing surface to perform the rubbing operation, the operation unit 330 does not always rattle.

  39 is a longitudinal sectional view of a portion of the erasing member 335 of the writing instrument 300 of FIG.

  At the rear end of the operation unit 330, a hole 331 extending forward is formed. The hole portion 331 is defined by the side wall portion 332 of the operation portion 330 and the bottom wall portion 333 substantially orthogonally coupled to the side wall portion 332. The inside of the hole 331 is filled with the erasing member 335. On the inner surface of the side wall portion 332 of the hole portion 331, two stepped portions 332a and 332b for reducing the inner diameter are formed. As a result, the small diameter portion on the bottom side and the large diameter portion on the inlet side and the middle diameter between them A part is formed. A relatively small through hole 333 a is provided at the center of the bottom wall 333 of the hole 331. In the present embodiment, each cross-sectional shape of the small diameter portion, the medium diameter portion and the large diameter portion is circular, but may be another shape such as oval or rectangular.

  The erasing member 335 has a relatively thin base portion 336 for filling the hole 331 and an outer portion 337 for abrading a handwriting etc., and has a relatively large diameter having an outer diameter substantially the same as the outer diameter of the operation portion 330. An outer portion 337 is formed, and as a result, a shoulder 338 is formed on the outer portion 337 based on the difference in outer diameter between the base 336 and the outer portion 337. Further, in the base portion 336 of the erasing member 335, a small diameter portion 336a, an intermediate diameter portion 336b, and a large diameter portion 336c are formed corresponding to the shape of the hole portion 331 of the operation portion 330.

  The operation unit 330 and the erasing member 335 are bonded to each other by adhesion or a two-color molding method. In the present embodiment, the operation unit 330 and the erasing member 335 are molded using a two-color molding method and joined together. When the two-color molding method is used, the cavity of the mold for molding the erasing member 335 in the core of the mold in which the operation portion 330 is first injection-molded and then the molded operation portion 330 is left. Are combined, and a rubber-based material different from the operation unit 330, for example, a rubber-based material to be described later is injected, and the erasing member 335 is additionally formed on the operation unit 330. By the two-color molding method, the surfaces of the operation unit 330 and the erasing member 335 are joined with relatively high strength depending on the material used.

  Since the through hole 333a is provided in the bottom wall portion 333 of the operation unit 330, the escape path of the gas generated from the molding material is secured when performing the injection molding of the erasing member 335 at the time of two-color molding. It is possible to prevent molding defects such as insufficient filling at the base 336 of the member 335.

  Further, since the two stepped portions 332a and 332b are formed on the side wall portion 332 of the operation portion 330, the edge of the step is engaged with the erasing member 335, and the joining is performed as compared with the case without the stepped portion. Strength is improved. In addition, it is possible to reduce the volume of the erasing member 335 which often uses a material more expensive than the operation unit 330. Furthermore, by making at least one cross-sectional shape of each of the cross-sectional shapes of the small diameter portion, the medium diameter portion and the large diameter portion into a non-circular shape such as an ellipse, a structure for torsional moment acting on the erasing member 335 around the axis. Support is provided.

  As described above, the operation unit 330 and the erasing member 335 can prevent the erasing member 335 from falling off from the writing instrument main body even when the surface is strongly rubbed, and can ensure the retention strength of the erasing member 335 for a long time Become.

  FIG. 40 is a longitudinal cross-sectional view of the writing instrument 400 according to the fifth embodiment of the present invention in the non-writing state and with the front end facing upward, and FIG. 41 is a non-writing state in the writing instrument 400 of FIG. FIG. 42 is a vertical cross-sectional view of the writing instrument 400 of FIG. 40 with the front end of the writing instrument 400 knocking downward, and FIG. 43 is a writing state of the writing instrument 400 of FIG. FIG. 44 is a longitudinal cross-sectional view of the writing instrument 400 of FIG. 40 in a writing state and with the front end facing upward. 45 is an exploded view of the knock mechanism 410 of the writing instrument 400 of FIG. In FIGS. 40 to 44, the upper side is the vertical upper side, and the lower side is the vertical lower side. That is, gravity acts downward in each figure.

  In the knock mechanism of the writing instrument according to the above-described embodiment, the operation unit, the rotor, and the knock lock member are disposed in series in the shaft cylinder sequentially from the rear end side (see, for example, FIG. 4). Accordingly, the cam surface of the rotor and the cam receiving surface of the knock lock member cooperate with each other to rotate the knock lock member in the circumferential direction, and the locking portion and the knock lock member are locked. The basic configuration of the writing instrument 400 according to the present embodiment is different. That is, in the knock mechanism 410 of the writing instrument 400, as shown in FIG. 45, the rotor 440 is disposed in the operation unit 430 and moves in the front-rear direction in the operation unit 430. Thereby, the cam surface 432 of the operation portion 430 and the cam receiving surface 451 of the knock lock member 450 cooperate with each other to rotate the knock lock member 450 in the circumferential direction, and the locking portion 460 and the knock lock member 450 are engaged. Put it in the stop state. The details will be described below.

  The knock lock member 450 is movable in the front-rear direction in the barrel 4 by gravity. Therefore, although FIGS. 40 and 41 show the same non-writing state of the writing instrument 400, in FIG. 40, since the front end of the writing instrument 400, that is, the front end of the barrel 4 is upward, the knock locking member 450 It is close to the rear end side in the barrel 4. On the other hand, in FIG. 41, since the front end of the writing instrument 400, that is, the front end of the barrel 4 is downward, the knock lock member 450 is closer to the front end in the barrel 4 as compared with FIG. Further, FIG. 42 shows a state where the front end of the writing instrument 400 is knocking downward, but since the front end of the writing instrument 400, that is, the front end of the barrel 4 is downward, the knock lock member 450 is Compared with FIG. 40, it is closer to the front end side in the barrel 4. Similarly, FIGS. 43 and 44 show the same writing state of the writing instrument 400, but in FIG. 43, since the front end of the writing instrument 400, that is, the front end of the barrel 4 faces downward, the knock lock member 450 It is close to the front end side in the barrel 4. On the other hand, in FIG. 44, since the front end of the writing instrument 400, that is, the front end of the barrel 4 is upward, the knock lock member 450 is closer to the rear end in the barrel 4 compared to FIG.

  46 is a longitudinal cross-sectional view of the rear shaft 403 of the writing instrument 400 of FIG. In FIG. 46, the upper side is the front side of the writing instrument 400. At the rear end of the rear shaft 403, a notch 403a is formed which serves as a rotation stopper when the inner cylinder 420 is fitted by press fitting. Further, a locking portion 460 is provided at the middle of the inner surface of the rear shaft 403. The locking portion 460 has six second protrusions 461 arranged at equal intervals in the circumferential direction. In the present embodiment, the second protrusion 461 has the same shape as the second protrusion 361 in the fourth embodiment. Therefore, the second protrusion 461 has a parallelogram in cross section. The rear end face of the second protrusion 461 is a slope 462 which is inclined in the circumferential direction with respect to a plane perpendicular to the front-rear direction.

  47 is a front view of the inner cylinder 420 of the writing instrument 400 of FIG. 40, and FIG. 48 is a cross-sectional view of the inner cylinder 420 of FIG. 47 taken along line B-B. In FIG. 48, the upper side is the front side of the writing instrument 400. The inner cylinder 420 is a cylindrical member. On the inner surface of the central portion of the inner cylinder 420, outer cams 421 are provided at equal intervals in the circumferential direction. The outer cam 421 is composed of three large protrusions 422 protruding in the radial direction, and on the front end of each large protrusion 422 is formed a slope inclined in the circumferential direction with respect to a plane perpendicular to the front-rear direction There is. Three small protrusions 423 are provided on the inner surface of the central inner cylinder 420 between the large protrusions 422 along the circumferential direction. The small protrusion 423 has a radial thickness smaller than that of the large protrusion 422. Further, on the inner surface of the inner cylinder 420 rearward of the outer cam 421, a plurality of ribs 424 extending toward the rear end are provided. The plurality of ribs 424 reduce the frictional resistance between the biasing spring 490 described later disposed in the inner cylinder 420 and the inner surface of the inner cylinder 420.

  FIG. 49 is a perspective view of the operation unit 430 of the writing instrument 400 of FIG. 40, and FIG. 50 is a longitudinal sectional view of the operation unit 430 of the writing instrument 400 of FIG. In FIGS. 49 and 50, the upper side is the front side of the writing instrument 400. The operation unit 430 is a tubular member. The operation unit 430 has a cylindrical portion 431 having a smooth outer peripheral surface at a central portion in the axial direction. Three elliptical projections 431a are provided on the inner surface of the cylindrical portion 431 at equal intervals in the circumferential direction. The front of the cylindrical portion 431 is formed to have a slightly larger outer diameter, and a cam surface 432 is formed on the front end surface thereof. The cam surface 432 has six peaks 432a and valleys 432b. More specifically, the ridge portion 432a and the cam surface 432 have an inclined portion 432c circumferentially inclined with respect to a plane perpendicular to the front-rear direction and a vertical wall portion 432d extending along the front-rear direction. A valley portion 432 b is configured. The ridges 432a of the cam surface 432 of the operation unit 430 are asymmetric along the circumferential direction, but may be symmetrical.

  At the rear of the cylindrical portion 431, a guide portion 433 having an outer diameter slightly smaller than the outer diameter of the cylindrical portion 431 is formed. A rear wall 433 a is provided at the rear end of the guide portion 433. The guide portion 433 is formed with three slits 433 b along the axial direction. The three slits 433 b are provided at equal intervals in the circumferential direction so as to penetrate to the inside. Therefore, the three slits 433 b define three pillars 434 having a substantially fan-shaped cross section. A guide groove 434 a is formed on the outer surface of each of the pillars 434 along the axial direction. Further, on the inner surface of each of the pillars 434, a projection 434b extending forward from the inner surface of the rear wall 433a is formed. The front end face of each of the protrusions 434 b is formed with a V-shaped cam surface 435 defined in a V-shape. That is, three V-shaped cam surfaces 435 are formed on the inner surface of the guide portion 433.

  At the rear end surface of the guide portion 433, that is, the rear end surface of the rear wall 433 a of the guide portion 433, three fitting corner portions 436 extending rearward are formed. The three fitting corner portions 436 are provided at equal intervals in the circumferential direction, and are formed so as to be elastically deformable in the radial direction. A fitting protrusion 436 a extending radially outward is formed on the tip outer surface of each of the fitting corner portions 436.

  The operation unit 430 is inserted into the inner cylinder 420 from the front. At that time, each of the large projections 422 of the inner cylinder 420 is disposed between the slits 433 b of the operation unit 430, and accordingly, the pillars 434 of the operation unit 430 are disposed between the large projections 422 of the inner cylinder 420. . At this time, each of the small projections 423 formed in the inner cylinder 420 is disposed in the guide groove 434 a formed in the column 434 of the corresponding operation unit 430. By arranging the small projection 423 of the inner cylinder 420 in the guide groove 434 a of the operation unit 430, the rotation of the operation unit 430 in the circumferential direction with respect to the inner cylinder 420 is restricted, and the operation unit 430 is movable in the front-rear direction Become. Further, each of the large protrusions 422 of the inner cylinder 420 protrudes into the guide 433 of the operation unit 430 through the slits 433 b, and the amount of protrusion substantially corresponds to the amount of protrusion of the protrusion 434 b from the inner surface of the column 434 It is the same. Therefore, the large projection 422 of the inner cylinder 420 and the projection 434 b of the operation unit 430 cooperate with each other to act on the inner cam 443 of the rotor 440 described later.

  51 is a perspective view of the rotor 440 of the writing instrument 400 of FIG. In FIG. 51, the upper side is the front side of the writing instrument 400. The rotor 440 is a tubular member. The rotor 440 has a cylindrical main body 441 and a flange 442 provided at the front end of the main body 441. The outer diameter of the flange portion 442 is set to be slightly smaller than the inner diameter of the cylindrical portion 431 of the operation portion 430 to be inserted. Three inner cams 443 extending in the front-rear direction are provided on the outer peripheral surface of the main body 441 at equal intervals in the circumferential direction. The rear end surface of each of the inner cams 443 is formed with a saw blade-like cam receiving surface 444 that cooperates with the V-shaped cam surface 435 of the operation portion 430.

  The rotor 440 is inserted into the operation unit 430 from the front. After the rotor 440 is inserted, the flange portion 442 and the projection 431 a formed on the inner surface of the operation portion 430 do not easily come off. The inner cam 443 of the rotor 440 engages with the outer cam 421 or is disposed between the outer cam 421, which protrudes into the operation portion 430 through the slit 433b when the rotor 440 is rotated in the circumferential direction by the knocking operation. Ru. When the inner cam 443 is disposed between the outer cams 421, the outer cams 421 are disposed between the inner cams 443.

  The V-shaped cam surface 435 of the operating portion 430 and the cam receiving surface 444 of the rotor 340 are engaged with the V-shaped cam surface 435 when the inner cam 443 engages with the outer cam 421 or is disposed between the outer cams 421. It is configured to be out of phase with the surface 444. Therefore, when the slope of the V-shaped cam surface 435 presses the slope of the cam receiving surface 444 by the knocking operation, the rotor 440 receives a circumferential component force due to the operation load and the biasing force of the spring 6. Rotate in the direction. On the other hand, as described above, the small projections 423 of the inner cylinder 420 are disposed in the guide groove 434a, whereby the rotation of the operation portion 430 in the circumferential direction is restricted.

  52 is a perspective view of the knock lock member 450 of the writing instrument 400 of FIG. 40, and FIG. 53 is another perspective view of the knock lock member 450 of the writing instrument 400 of FIG. In FIGS. 52 and 53, the upper side is the front side of the writing instrument 400. The knock lock member 450 is a tubular member. The knock lock member 450 is penetrated by the refill 5 and is movable in the front-rear direction between the locking portion 460 and the operation portion 430.

  A cam receiving surface 451 having a shape complementary to the cam surface 432 of the operation portion 430 is formed on the rear end surface of the knock lock member 450. The cam receiving surface 451 has six peak portions 451 a and valley portions 451 b similarly to the cam surface 432 of the operation portion 430. That is, the cam receiving surface 451 of the knock lock member 450 has an inclined portion 451 c circumferentially inclined with respect to a plane perpendicular to the front-rear direction, and a vertical wall 451 d extending along the front-rear direction. A mountain portion 451a and a valley portion 451b are configured.

  On the outer peripheral surface of the cylindrical portion 450a of the knock lock member 450, six first protrusions 452 having a shape similar to that of the knock lock member 350 according to the fourth embodiment are provided. The first protrusions 452 extend in the front-rear direction and are arranged at equal intervals in the circumferential direction. The adjacent first projections 452 define six guide grooves 453 extending in the front-rear direction.

  In the side surface 452 a in the circumferential direction of the first protrusion 452, in particular, the side surface 452 a of the front end portion, a recess 454 in the circumferential direction is formed. The bottom surface of the recess 454 is a side surface 455 parallel to the side surface 452 a in the circumferential direction of the first protrusion 452. The inner surface on the rear side of the recess 454 is a slope 456 inclined in the circumferential direction with respect to a plane perpendicular to the front-rear direction. The concave portion 454 is formed in a step shape as viewed from the front to the rear of the first projection 452. The side surface 455 of the first projection 452 plays a role of restricting circumferential rotation of the knock lock member 450.

  Each of the guide grooves 453 of the knock lock member 450 accommodates therein the second projection 461 of the locking portion 460 of the corresponding rear shaft 403, and allows the inside of the guide groove 453 to be relatively movable in the front and back direction. There is.

  The cam surface 432 of the operation portion 430 and the cam receiving surface 451 of the knock lock member 450 are located on the cam surface 432 when the second projection 461 of the locking portion 460 is accommodated in the guide groove 453 of the knock lock member 450. The ridge portion 432 a is configured to be positioned on the inclined portion 451 c of the cam receiving surface 451 in the circumferential direction. Therefore, for example, when the front end of the writing instrument 400 is directed upward as shown in FIG. 40, the knock lock member 450 abuts on the operation portion 430 by the action of gravity, but due to the weight of the knock lock member 450, the knock lock member 450 receives a component of force in the circumferential direction and rotates in the circumferential direction. On the other hand, rotation of the operation part 430 in the circumferential direction is restricted by the small projection part 423 of the inner cylinder 420 being disposed in the guide groove 434a.

  FIG. 54 is a side view of the front shaft 402 of the writing instrument 400 of FIG. A screwing portion 402a screwed with the rear shaft 403 is formed at the rear of the front shaft 402, and a buffer member 402b is disposed at the rear end of the front shaft 402 at the rear of the screwing portion 402a. When the writing instrument 400 is replaced by holding the writing instrument 400 from the state where the front end is upward, that is, the knock lock member 450 is close to the rear end, the knock lock member 450 is operated by gravity. Move forward The forward movement of the knock lock member 450 is stopped by the contact with the rear end surface of the front shaft 402, that is, the collision. At this time, the shock absorbing member 402 b is provided at the rear end portion of the front shaft 402, so that the impact and sound at the time of a collision can be reduced. Therefore, the forward movement of the knock lock member 450 is blocked by the abutment with the buffer member 402b, particularly the rear end face.

  The buffer member 402 b may be made of, for example, a material that can be selected as an erasing member to be described later. In that case, the buffer member 402b may be provided at the rear end of the front shaft 402 by adhesion or two-color molding. Further, a spring, a sponge or the like may be arranged as the buffer member 402b. In the present embodiment, the buffer member 402 b is provided at the rear end of the front shaft 402, but may be provided at the front end of the knock lock member 450. These configurations are, of course, also applicable to the other embodiments.

  55 is a perspective view of the erasing member 470 of the writing instrument 400 of FIG. 40, and FIG. 56 is a longitudinal sectional view of the erasing member 470 of the writing instrument 400 of FIG. In FIG. 56, the lower side is the front side of the writing instrument 400. The erasing member 470 is provided at the rear end of the holding member 471 and attached to the rear end of the operation unit 430 via the holding member 471. In other words, a part of the operation unit 430 functions as the erasing unit. The erasing member 470 is provided to the holding member 471 by adhesion or two-color molding or the like.

  The holding member 471 has a holding portion main body 472. The front portion of the holding portion main body 472 is formed in a tubular shape that opens forward. Three rectangular openings 473 are formed on the outer peripheral surface of the cylindrical portion. Further, a flange portion 474 is formed on the outer peripheral surface forward of the opening 473. The holding member 471 is attached to the fitting corner portion 436 of the operation portion 430 by fitting. That is, when attaching the holding member 471, the fitting corner portion 436 of the operation portion 430 elastically deforms inward in the radial direction, and the fitting projection 436 a of the fitting corner portion 436 is in the opening 473 of the holder main body 472. Snap fit on the. The rear portion of the holding portion main body 472 is formed into a truncated truncated triangular pyramid as a whole along with the erasing member 470.

  As shown in FIGS. 41 to 43, a cover member 480 is attached to the erasing member 470, although not shown in FIGS. Specifically, the cover member 480 is detachably fitted to the holding portion main body 472. The front end surface of the cover member 480 is in contact with the rear end surface of the flange portion 474 of the holding member 471. Since the erasing member 470 is covered by the cover member 480 except when used, it is possible to prevent the erasing member 470 from being soiled. An air hole is formed on the closed end face of the rear end of the cover member 480.

  Furthermore, as shown in FIGS. 40 to 44, the guide portion 433 of the operation portion 430 is located between the rear end surfaces of the three large protrusions 422 of the inner cylinder 420 and the front end surface of the flange portion 474 of the holding member 471. A biasing spring 490 is disposed to surround the The biasing spring 490 biases the holding member 471, and further, the operating portion 430 connected to the holding member 471 and the erasing member 470 attached to the holding member 471, with respect to the inner cylinder 420. Therefore, regardless of whether the writing instrument 400 is in the writing state or in the non-writing state, the erasing member 470 is always disposed at the same position in the axial direction.

  FIG. 57 is a schematic view showing switching of the knock mechanism 410 of the writing instrument 400 of FIG. 40 from the non-writing state to the writing state. FIG. 57 is a schematic view similar to FIG. 12, in which the upper side is the front side of the writing instrument 400 and the lower side is the rear side of the writing instrument 400.

  FIG. 57 (a) is a schematic view of the knock mechanism 410 in a non-writing state of the writing instrument 400 as shown in FIG. 40 and in a state where the front end is upward. Therefore, gravity acts downward in the figure. At this time, the inner cam 443 of the rotor 440 biased rearward by the spring 6 via the refill 5 is disposed between the outer cams 421. Therefore, in this state, the writing unit 5 a is immersed in the barrel 4. Further, although the V-shaped cam surface 435 of the operation portion 430 and the cam receiving surface 444 of the rotor 440 are in contact with each other, the V-shaped cam surface 435 and the cam receiving surface 444 are out of phase.

  By directing the front end of the writing instrument 400 upward, the knock lock member 450 moves rearward and abuts on the operation unit 430. As described above, the knock lock member 450 rotates in the circumferential direction by receiving a component of force in the circumferential direction caused by its own weight. That is, the cam surface 432 of the operation portion 430 and the cam receiving surface 451 of the knock lock member 450 cooperate to rotate the knock lock member 450 in the circumferential direction. As a result of the rotation, the knock lock member 450 locks with the locking portion 460 and the forward movement of the operation portion 430 is blocked.

  Specifically, the second projection 461 of the locking portion 460 is accommodated in the recess 454 of the first protrusion 452 of the knock lock member 450, whereby the knock lock member 450 and the locking portion 460 are locked. It will be in the state. In other words, in the non-writing state, the recessed portion 454 is configured to receive the second protruding portion 461 of the locking portion 460 so that the second protruding portion 461 of the locking portion 460 is accommodated in the recessed portion 454 of the first protruding portion 452 of the knock lock member 450. It is configured to have a shape complementary to a part of the two protrusions 461. Therefore, the slope 462 of the second protrusion 461 has the same inclination as the slope 456 of the recess 454. In this state, even if the operation part 430 is strongly pressed to move it forward, the component force in the direction in which the second projection 461 of the locking part 460 is accommodated in the recess 454 of the knock lock member 450 becomes strong The lock state is not released.

  FIG. 57 (b) is a schematic view of the knock mechanism 410 in a non-writing state of the writing instrument 400 as shown in FIG. 41 and in a state where the front end is directed downward. Therefore, gravity acts upward in the figure. By directing the front end of the writing instrument 400 downward, the knock lock member 450 is freed in relation to the operation unit 430. On the other hand, the knock lock member 450 presses the locking portion 460 via the first projection 452 by its own weight. That is, due to the weight of knock lock member 450, slope 456 of recess 454 of first protrusion 452 receives a component force in the circumferential direction from slope 462 of second protrusion 461 of locking portion 460. As a result, the knock lock member 450 rotates in the circumferential direction opposite to that in FIG. 57A, and the second protrusion 461 is guided into the guide groove 453. That is, the locked state of the knock lock member 450 and the locking portion 460 is released, and the operation portion 430 can be moved forward. The forward movement of the knock lock member 450 is stopped by the buffer member 402 b of the front shaft 2.

  FIG. 57 (c) is a schematic view of the knock mechanism 410 in transition to the writing state of the writing instrument 400 as shown in FIG. 42 and in a state where the front end is directed downward. Therefore, gravity acts upward in the figure. When the operating portion 430 is pressed against the biasing force of the spring 6 and the biasing spring 490 to move the operating portion 430 and the rotor 440 forward, the rear end portion of the inner cam 443 is It passes over the front end, ie the large projection 422. Thereby, the restriction of the circumferential rotation of the rotor 440 is released. At this time, since the V-shaped cam surface 435 of the operation unit 430 and the cam receiving surface 444 of the rotor 440 are out of phase, the rotor 440 receives a component force in the circumferential direction.

  FIG. 57D is a schematic view of the knock mechanism 410 in the writing state of the writing instrument 400 as shown in FIG. 43 and with the front end facing downward. Therefore, gravity acts upward in the figure. When the pressing of the operation portion 430 is released from the state of FIG. 57 (c), the rotor 440 is retracted by the biasing force of the spring 6. At this time, since rotation of the rotor 440 in the circumferential direction by the side surface of the outer cam 421 is not restricted, the rotor 440 receives a component force from the slope of the outer cam 421 and rotates in the circumferential direction. That is, the inner cam 443 of the rotor 440 moves on the slope of the outer cam 421. As a result, the inner cam 443 engages with the outer cam 421, that is, the saw blade-like cam receiving surface 444 and the large projection 422 of the outer cam 421 engage to prevent the backward movement, and the rotation via the refill 5 is performed. Since the writing unit 5a connected to the child 440 is kept in the state of protruding from the barrel 4, writing is possible. The operating portion 430 is retracted by the biasing force of the biasing spring 490 and returns to the original position.

  FIG. 57 (e) is a schematic view of the knock mechanism 410 in a writing state of the writing instrument 400 as shown in FIG. 44 and in a state where the front end is upward. Therefore, gravity acts downward in the figure. By turning the front end of the writing instrument 400 upward, the knock lock member 450 moves rearward and abuts on the operation unit 430 again. As described above, the knock lock member 450 rotates in the circumferential direction by receiving a component of force in the circumferential direction caused by its own weight. That is, the cam surface 432 of the operation portion 430 and the cam receiving surface 451 of the knock lock member 450 cooperate to rotate the knock lock member 450 in the circumferential direction. As a result of the rotation, the knock lock member 450 locks with the locking portion 460 and the forward movement of the operation portion 430 is blocked.

  Specifically, the second projection 461 of the locking portion 460 is accommodated again in the recess 454 of the first protrusion 452 of the knock lock member 450, whereby the knock lock member 450 and the locking portion 460 are engaged. It will be stopped. In this state, even if the operation part 430 is strongly pressed to move it forward, the component force in the direction in which the second projection 461 of the locking part 460 is accommodated in the recess 454 of the knock lock member 450 becomes strong The lock state is not released.

  As described above, the locked state between the knock lock member 450 and the locking portion 460 via the recess 454 is released when the front end of the writing instrument 400 is directed downward. By performing a knock operation in that state, the writing instrument 400 can be switched from the writing state to the non-writing state. This will be briefly described with reference to FIG.

  FIG. 58 is a schematic view showing switching of the knocking mechanism 410 of the writing instrument 400 of FIG. 40 from the writing state to the non-writing state. FIG. 58 is a schematic view similar to FIG. 12, in which the upper side is the front side of the writing instrument 400 and the lower side is the rear side of the writing instrument 400.

  58 (a) is the same as FIG. 57 (d), and is a schematic view of the knock mechanism 410 in the writing state of the writing instrument 400 as shown in FIG. 43 and in the state where the front end is downward. Therefore, gravity acts upward in the figure.

  FIG. 58 (b) is a schematic view of the knock mechanism 410 in transition to the non-writing state of the writing instrument 400 and in a state where the front end is directed downward. Therefore, gravity acts upward in the figure. When the operating portion 430 is pressed against the biasing force of the spring 6 and the biasing spring 490 to move the operating portion 430 and the rotor 440 forward, the rear end portion of the inner cam 443 is It passes over the front end, ie the large projection 422. Thereby, the restriction of the circumferential rotation of the rotor 440 is released. At this time, since the V-shaped cam surface 435 of the operation unit 430 and the cam receiving surface 444 of the rotor 440 are out of phase, the rotor 440 receives a component force in the circumferential direction.

  FIG. 58 (c) is a schematic view of the knock mechanism 410 in transition to the non-writing state of the writing instrument 400 and in a state where the front end is directed downward. Therefore, gravity acts upward in the figure. When the pressing of the operation portion 430 is gradually released from the state of FIG. 58 (b), the rotor 440 is retracted by the biasing force of the spring 6. Immediately after this, since rotation in the circumferential direction of the rotor 440 by the side surface of the outer cam 421 is not restricted, the rotor 440 receives a component force from the slope of the outer cam 421 and rotates in the circumferential direction. That is, the inner cam 443 of the rotor 440 moves on the slope of the outer cam 421. The retraction of the operating portion 430 causes the rotor 440 to rotate in the circumferential direction until the inner cam 443 of the rotor 440 is disposed between the outer cams 421. At this time, rotation of the rotor 440 in the circumferential direction is restricted by the side surface of the outer cam 421.

  FIG. 58 (d) is the same as FIG. 57 (b) and is a schematic view of the knock mechanism 410 in a non-writing state of the writing instrument 400 as shown in FIG. 41 and in a state where the front end is downward. Therefore, gravity acts upward in the figure. When the pressing of the operation portion 430 is completely released from the state of FIG. 58 (c), the rotor 440 is further retracted by the biasing force of the spring 6. Since the inner cam 443 of the rotor 440 is disposed between the outer cams 421, the rotor 440 continues until the writing portion 5a connected to the rotor 440 via the refill 5 is inserted into the barrel 4. fall back. As a result, the writing instrument 400 is in a non-writing state. The operating portion 430 is retracted by the biasing force of the biasing spring 490 and returns to the original position.

  59 is a longitudinal cross-sectional view of the writing instrument 500 according to the sixth embodiment of the present invention in the non-writing state and with the front end facing upward, and FIG. 60 is a non-writing state in the writing instrument 500 of FIG. FIG. 61 is a longitudinal cross-sectional view of the writing instrument 500 of FIG. 59 in the writing state and with the front end facing downward, and FIG. 62 is a longitudinal cross-sectional view in the writing state of the writing instrument 500 of FIG. It is. FIG. 63 is an exploded view of the knock mechanism 510 of the writing instrument of FIG. 59. In FIGS. 59 to 63, the upper side is the vertical upper side, and the lower side is the vertical lower side. That is, gravity acts downward in each figure.

  In the knock mechanism 510 of the writing instrument 500 according to the present embodiment, as shown in FIG. 63, since the operation unit 530 is formed longer in the axial direction than the knock lock member 450, the knock lock member 450 , Is disposed to surround the operation unit 530. The knock lock member 450 has the same shape as the knock lock member 450 of the writing instrument 400 according to the fifth embodiment. The operating portion 530 extends forward through the knock lock member 450 and cooperates with the rotor 540. The cam surface 532 of the operation portion 530 and the cam receiving surface 451 of the knock lock member 450 cooperate with each other to rotate the knock lock member 450 in the circumferential direction, and the locking portion 560 and the knock lock member 450 are locked. Let The details will be described below. In the present embodiment, the erasing member and the holding member are also the same as the erasing member 470 and the holding member 471 of the writing instrument 400 according to the fifth embodiment.

  The knock lock member 450 is movable in the front-rear direction in the barrel 4 by gravity. Therefore, although FIGS. 59 and 60 show the same non-writing state of the writing instrument 500, in FIG. 59, since the front end of the writing instrument 500, that is, the front end of the barrel 4 is upward, the knock lock member 450 It is close to the rear end side in the barrel 4. On the other hand, in FIG. 60, since the front end of the writing instrument 500, that is, the front end of the barrel 4 is downward, the knock lock member 450 is closer to the front end in the barrel 4 compared to FIG. 61 and 62 show the same writing state of the writing instrument 500, but in FIG. 61, since the front end of the writing instrument 500, that is, the front end of the barrel 4 faces downward, the knock lock member 450 has an axis In the cylinder 4 it is close to the front end side. On the other hand, in FIG. 62, since the front end of the writing instrument 500, that is, the front end of the barrel 4 is upward, the knock lock member 450 is closer to the rear end in the barrel 4 compared to FIG.

  FIG. 64 is a longitudinal cross-sectional view of the rear shaft 503 of the writing instrument 500 of FIG. In FIG. 64, the upper side is the front side of the writing instrument 500. A locking portion 560 is provided at the middle of the inner surface of the rear shaft 503. The locking portion 560 has three second protrusions 561 arranged at equal intervals in the circumferential direction. The rear end surface of the second protrusion 561 is an inclined surface 562 which is inclined in the circumferential direction with respect to a plane perpendicular to the front-rear direction. In addition, an outer cam 563 is formed in front of the second protrusion 561 via a large protrusion 564 that protrudes in the radial direction from the second protrusion 561. The front end face of the outer cam 563 is a slope inclined in the same direction as the slope 562 of the second protrusion 561 with respect to a plane perpendicular to the front-rear direction.

  FIG. 65 is a perspective view of the operation unit 530 of the writing instrument 500 of FIG. In FIG. 65, the upper side is the front side of the writing instrument 500. The operation unit 530 is a tubular member. The operation unit 530 has a cylindrical portion 531 having a smooth outer peripheral surface at a central portion in the axial direction. The rear of the cylindrical portion 531 is formed with a slightly larger outer diameter via a step portion 531a facing the front, and a cam surface 532 facing the front is formed. The cam surface 532 has six peaks 532a and valleys 532b. In detail, the cam portion 532a and the cam portion 532a are provided such that the cam surface 532 has an inclined portion 532c circumferentially inclined with respect to a plane perpendicular to the longitudinal direction, and a vertical wall portion 532d extending along the longitudinal direction. A valley portion 532 b is configured. The ridges 532a of the cam surface 532 of the operation unit 530 are asymmetric along the circumferential direction, but may be symmetrical.

  On the outer peripheral surface of the front portion of the cylindrical portion 531, three guide grooves 531b extending in the front-rear direction and extending to the front end portion are formed. A cam surface 533 is formed on the front end surface of the cylindrical portion 531. The cam surface 533 has six peaks 534 and valleys 535.

  At the rear end portion of the operation unit 530, three fitting corner portions 536 extending rearward, which are identical to the fitting corner portions 436 of the operation unit 430 of the writing instrument 400 according to the fifth embodiment, are formed There is. The three fitting corner portions 536 are provided at equal intervals in the circumferential direction, and are formed so as to be elastically deformable in the radial direction. A fitting protrusion 536 a extending radially outward is formed on the tip outer surface of each of the fitting corner portions 536.

  The operation unit 530 is inserted to the rear shaft 503 from the front. At this time, each of the large protrusions 564 formed on the rear shaft 503 is disposed in the corresponding guide groove 531 b of the operation unit 530. By arranging the large projection 564 of the rear shaft 503 in the guide groove 531 b of the operation portion 530, the rotation of the operation portion 530 in the circumferential direction with respect to the rear shaft 503 is restricted, and it is possible to move in the front and rear direction Become.

  66 is a perspective view of the rotator of the writing instrument 500 of FIG. 59. FIG. In FIG. 66, the upper side is the front side of the writing instrument 500. The rotor 540 is a tubular member. The rotor 540 has a cylindrical main portion 541. Three inner cams 543 extending in the front-rear direction are provided on the outer peripheral surface of the main body 541 at equal intervals in the circumferential direction. On the rear end face of each of the inner cams 543, a saw blade-like cam receiving surface 544 that cooperates with the cam surface 533 of the operation portion 530 is formed.

  The inner cam 543 of the rotor 540 engages with the outer cam 563 or is disposed between the outer cams 563 when the rotor 540 is circumferentially rotated by the knocking operation. When the inner cam 543 is disposed between the outer cams 563, the outer cam 563 is disposed between the inner cams 543.

  The cam surface 533 of the operation portion 530 and the cam receiving surface 544 of the rotor 540 are in contact with the cam surface 533 and the cam receiving surface 544 when the inner cam 543 engages with the outer cam 563 or is disposed between the outer cams 563. It is configured to be out of phase. Therefore, when the inclined surface of the cam surface 533 presses the inclined surface of the cam receiving surface 544 by the knocking operation, the rotor 540 receives a component force in the circumferential direction due to the operation load and the biasing force of the spring 6, Rotate. On the other hand, as described above, the large projection 564 of the rear shaft 503 is disposed in the guide groove 531b to restrict rotation of the operation unit 530 in the circumferential direction.

  As described above, the knock lock member of the writing instrument 500 according to the present embodiment has the same shape as the knock lock member 450 of the writing instrument 400 according to the fifth embodiment. In the present embodiment, the knock lock member 450 is penetrated by the operation unit 530 and is movable in the front-rear direction between the locking unit 560 and the operation unit 530. The cam receiving surface 451 formed on the rear end surface of the knock lock member 450 has a shape complementary to the cam surface 532 of the operation portion 530. Each of the guide grooves 453 of the knock lock member 450 accommodates therein the second projection 561 of the locking portion 560 of the corresponding rear shaft 503, and allows the inside of the guide groove 453 to be relatively movable in the front and back direction. There is.

  The cam surface 532 of the operation portion 530 and the cam receiving surface 451 of the knock lock member 450 are located on the cam surface 532 when the second projection 561 of the locking portion 560 is accommodated in the guide groove 453 of the knock lock member 450. The mountain portion 532 a is configured to be located on the inclined portion 451 c of the cam receiving surface 451 in the circumferential direction. Therefore, for example, as shown in FIG. 59, when the front end of the writing instrument 500 is directed upward, the knock lock member 450 abuts on the operation portion 530 by the action of gravity, but due to its own weight, the knock lock member 450 receives a component of force in the circumferential direction and rotates in the circumferential direction. On the other hand, rotation of the operation portion 530 in the circumferential direction is restricted by the large projection 564 of the rear shaft 503 being disposed in the guide groove 531b.

  Furthermore, as shown in FIGS. 59 to 62, the cylindrical portion 531 of the operation portion 530 is formed between the rear end surfaces of the three large protrusions 564 of the rear shaft 503 and the front end surface of the flange portion 474 of the holding member 471. A biasing spring 590 is disposed to surround the The biasing spring 590 biases the holding member 471, and further, the operation portion 530 connected to the holding member 471 and the erasing member 470 attached to the holding member 471 with respect to the rear shaft 503 to the rear. Therefore, regardless of whether the writing instrument 500 is in the writing state or in the non-writing state, the erasing member 470 is always disposed at the same position in the axial direction. The knock lock member 450 is disposed to surround the biasing spring 590.

  FIG. 67 is a schematic view showing the switching from the non-writing state to the writing state of the knock mechanism 510 of the writing instrument 500 of FIG. FIG. 67 is a schematic view similar to FIG. 12, in which the upper side is the front side of the writing instrument 500 and the lower side is the rear side of the writing instrument 500.

  FIG. 67A is a schematic view of the knock mechanism 510 in a non-writing state of the writing instrument 500 as shown in FIG. 59 and in a state where the front end is upward. Therefore, gravity acts downward in the figure. At this time, the inner cam 543 of the rotor 540 biased rearward by the spring 6 via the refill 5 is disposed between the outer cams 563. Therefore, in this state, the writing unit 5 a is immersed in the barrel 4. Further, although the cam surface 533 of the operation unit 530 and the cam receiving surface 544 of the rotor 540 are in contact with each other, the cam surface 533 and the cam receiving surface 544 are out of phase.

  By directing the front end of the writing instrument 500 upward, the knock lock member 450 moves rearward and abuts on the operation unit 530. As described above, the knock lock member 450 rotates in the circumferential direction by receiving a component of force in the circumferential direction caused by its own weight. That is, the cam surface 532 of the operation portion 530 and the cam receiving surface 451 of the knock lock member 450 cooperate to rotate the knock lock member 450 in the circumferential direction. As a result of the rotation, the knock lock member 450 locks with the locking portion 560 and the forward movement of the operation portion 530 is blocked.

  Specifically, the second projection 561 of the locking portion 560 is accommodated in the recess 454 of the first protrusion 452 of the knock locking member 450, whereby the knock locking member 450 and the locking portion 560 are locked. It will be in the state. In other words, in the non-writing state, the concave portion 454 is configured to receive the second protrusion 561 of the locking portion 560 so as to be accommodated in the recess 454 of the first protrusion 452 of the knock lock member 450. It is configured to have a shape complementary to a part of the two protrusions 561. Therefore, the slope 562 of the second protrusion 561 has the same inclination as the slope 456 of the recess 454. In this state, even if the operation part 530 is strongly pressed to move it forward, the component force in the direction in which the second projection 561 of the locking part 560 is accommodated in the recess 454 of the knock lock member 450 becomes strong. The lock state is not released.

  FIG. 67 (b) is a schematic view of the knock mechanism 510 in a non-writing state of the writing instrument 500 as shown in FIG. 60 and in a state where the front end is directed downward. Therefore, gravity acts upward in the figure. By directing the front end of the writing instrument 500 downward, the knock lock member 450 is freed in relation to the operation unit 530. On the other hand, the knock lock member 450 presses the locking portion 560 via the first projection 452 by its own weight. That is, due to the weight of knock lock member 450, slope 456 of recess 454 of first protrusion 452 receives a component force in the circumferential direction from slope 562 of second protrusion 561 of locking portion 560. As a result, the knock lock member 450 rotates in the circumferential direction opposite to that in the case of FIG. 67A, and the second protrusion 561 is guided in the guide groove 453. That is, the locked state between the knock lock member 450 and the locking portion 560 is released, and the operation portion 530 can be moved forward. The forward movement of the knock lock member 450 is stopped by the abutment of the rear shaft 503 with the rear end surface of the large projection 564. Therefore, the large projection 564 of the rear shaft 503 may be formed as the buffer member described above.

  FIG. 67 (c) is a schematic view of the knock mechanism 510 in transition to the writing state of the writing instrument 500 and in a state where the front end is directed downward. Therefore, gravity acts upward in the figure. When the operating portion 530 is pressed against the biasing force of the spring 6 and the biasing spring 590 to move the operating portion 530 and the rotor 540 forward, the rear end portion of the inner cam 543 moves Cross the front edge. Thereby, the restriction of the circumferential rotation of the rotor 540 is released. At this time, since the cam surface 533 of the operation unit 530 and the cam receiving surface 544 of the rotor 540 are out of phase, the rotor 540 receives a component force in the circumferential direction.

  FIG. 67 (d) is a schematic view of the knock mechanism 510 in a writing state of the writing instrument 500 as shown in FIG. 61 and in a state where the front end is directed downward. Therefore, gravity acts upward in the figure. When the pressing of the operation portion 530 is released from the state of FIG. 67 (c), the rotor 540 is retracted by the biasing force of the spring 6. At this time, since the circumferential rotation of the rotor 540 due to the side surface of the outer cam 563 is not restricted, the rotor 540 receives a component force from the slope of the outer cam 563 and rotates in the circumferential direction. That is, the inner cam 543 of the rotor 540 moves on the slope of the outer cam 563. As a result, the inner cam 543 engages with the outer cam 563, that is, the saw blade shaped cam receiving surface 544 and the outer cam 563 are engaged to prevent the backward movement, and are connected to the rotor 540 via the refill 5. Since the writing unit 5a is kept in the state of protruding from the barrel 4, writing is possible. The operation unit 530 is retracted by the biasing force of the biasing spring 590 and returns to the original position.

  FIG. 67E is a schematic view of the knock mechanism 510 in a writing state of the writing instrument 500 as shown in FIG. 62 and in a state where the front end is upward. Therefore, gravity acts downward in the figure. By turning the front end of the writing instrument 500 upward, the knock lock member 450 moves rearward and abuts on the operation unit 530 again. As described above, the knock lock member 450 rotates in the circumferential direction by receiving a component of force in the circumferential direction caused by its own weight. That is, the cam surface 532 of the operation portion 530 and the cam receiving surface 451 of the knock lock member 450 cooperate to rotate the knock lock member 450 in the circumferential direction. As a result of the rotation, the knock lock member 450 locks with the locking portion 560 and the forward movement of the operation portion 530 is blocked.

  Specifically, the second projection 561 of the locking portion 560 is accommodated again in the recess 454 of the first protrusion 452 of the knock lock member 450, whereby the knock lock member 450 and the locking portion 460 are engaged. It will be stopped. In this state, even if the operation part 530 is strongly pressed to move it forward, the component force in the direction in which the second projection 561 of the locking part 560 is accommodated in the recess 454 of the knock lock member 450 becomes strong. The lock state is not released.

  As described above, the locked state of the knock lock member 450 and the locking portion 560 via the recess 454 is released by the front end of the writing instrument 500 being in the downward state. By performing the knock operation in that state, the writing instrument 500 can be switched from the writing state to the non-writing state. This will be briefly described with reference to FIG.

  FIG. 68 is a schematic view showing the switching from the writing state to the non-writing state of the knock mechanism 510 of the writing instrument 500 of FIG. FIG. 68 is a schematic view similar to FIG. 12, in which the upper side is the front side of the writing instrument 500 and the lower side is the rear side of the writing instrument 500.

  68 (a) is the same as FIG. 67 (d), and is a schematic view of the knock mechanism 510 in the writing state of the writing instrument 500 as shown in FIG. 61 and in the state where the front end is downward. Therefore, gravity acts upward in the figure.

  FIG. 68B is a schematic view of the knock mechanism 510 in transition to a non-writing state of the writing instrument 500 and in a state where the front end is directed downward. Therefore, gravity acts upward in the figure. When the operating portion 530 is pressed against the biasing force of the spring 6 and the biasing spring 590 to move the operating portion 530 and the rotor 540 forward, the rear end portion of the inner cam 543 moves Cross the front edge. Thereby, the restriction of the circumferential rotation of the rotor 540 is released. At this time, since the cam surface 533 of the operation unit 530 and the cam receiving surface 544 of the rotor 540 are out of phase, the rotor 540 receives a component force in the circumferential direction.

  FIG. 68C is a schematic view of the knock mechanism 510 in transition to a non-writing state of the writing instrument 500 and in a state where the front end is directed downward. Therefore, gravity acts upward in the figure. When the pressing of the operation portion 530 is gradually released from the state of FIG. 68 (b), the rotor 540 is retracted by the biasing force of the spring 6. Immediately after this, since the circumferential rotation of the rotor 540 by the side surface of the outer cam 563 is not restricted, the rotor 540 receives a component force from the slope of the outer cam 563 and rotates in the circumferential direction. That is, the inner cam 543 of the rotor 540 moves on the slope of the outer cam 563. The retraction of the operating portion 530 causes the rotor 540 to rotate in the circumferential direction until the inner cam 543 of the rotor 540 is disposed between the outer cams 563. At this time, the circumferential rotation of the rotor 540 is restricted by the side surface of the outer cam 563.

  FIG. 68 (d) is the same as FIG. 67 (b) and is a schematic view of the knock mechanism 510 in the non-writing state of the writing instrument 500 as shown in FIG. 60 and in the state where the front end is downward. Therefore, gravity acts upward in the figure. When the pressing of the operation portion 530 is completely released from the state of FIG. 68C, the rotor 540 is further retracted by the biasing force of the spring 6. Since the inner cam 543 of the rotor 540 is disposed between the outer cams 563, the rotor 540 continues until the writing portion 5 a connected to the rotor 540 via the refill 5 is inserted into the cylinder 4. fall back. As a result, the writing instrument 500 is in a non-writing state. The operation unit 530 is retracted by the biasing force of the biasing spring 590 and returns to the original position.

  In the fifth embodiment and the sixth embodiment, as described in the second embodiment and the fourth embodiment, the operation unit is also possible if the front end of the writing instrument is in the upward state in both the non-writing state and the writing state Forward movement is blocked. Therefore, for example, at the time of erasing the handwriting by the writing instrument 400 using the erasing member 470 of the operation unit 430, it is possible to perform a stable rubbing operation regardless of whether the writing instrument 400 is in the writing state or in the non-writing state. Become. That is, even if the user changes the writing tool and presses the operation unit against the writing surface to perform the rubbing operation, the operation unit does not always rattle.

  Furthermore, in the fifth and sixth embodiments, since the operation portion and the erasing member are always urged rearward, the amount of protrusion of the erasing member from the rear end of the barrel is in the non-writing state and the writing state In either case, it is the same as in the second and fourth embodiments. Therefore, when erasing the handwriting by the writing instrument using the erasing unit of the operation unit, the erasing unit can be equally viewed regardless of whether the writing instrument is in the writing state or in the non-writing state. As a result, it is possible to easily aim at the intended location, and it is possible to perform an accurate rubbing operation.

  Further, in the fifth embodiment, since the rotor 440 is disposed in the operation unit 430, the entire length of the refill 5 can be made longer, and as a result, the writing distance can be made longer. Become.

  The knock lock member may have any shape as long as it can move in the longitudinal direction in the shaft cylinder. The number of first protrusions of the knock lock member and the number of second protrusions of the corresponding locking portion may be the same or different, and can be set arbitrarily. Therefore, each may be one or more than one. The shape of a portion of the first protrusion of the knock lock member and the shape of the recess of the second protrusion of the corresponding locking portion may be any shape as long as they can be locked to each other without being complementary. is there.

  The refill 5 which is a cursive body in the embodiment described above may contain a thermochromic ink. In this case, the writing instrument 1 is a thermochromic writing instrument, and it is possible to thermally discolor the handwriting of the writing instrument 1 by the frictional heat generated when it is abraded by the friction member which is the erasing portion. In addition, as a writing material, a ballpoint pen containing a thermochromic ink, a mechanical pencil containing a thermochromic core, a pencil holder, or the like can be used. In addition, a writing instrument containing an eraser erasable ink erasable with an eraser may be used.

  Here, the thermochromic ink maintains a predetermined color (first color) at normal temperature (for example 25 ° C.), and when heated up to a predetermined temperature (for example 60 ° C.), changes to another color (second color) The ink has the property of returning to the original color (first color) again when cooled to a predetermined temperature (for example, -5.degree. C.). In the writing instrument 1 using the thermochromic ink, to make the second color colorless and to heat the drawn line drawn in the first color (for example red) to make it colorless is referred to as "erasing" here. . Therefore, the writing surface or the like on which the drawn line has been written is abraded with a friction body as an erasing portion to generate frictional heat, thereby changing the drawn line to colorlessness, ie, erasing it. As a matter of course, the second color may be a color other than colorless.

  In the case of a writing instrument containing an eraser erasable ink erasable with an eraser, the eraser erasable ink contains water and non-thermoplastic colored resin particles having an average particle diameter of 1.0 to 15 μm relative to the total amount of the ink composition. It is necessary to contain at least 3 to 30% by weight and 0.1 to 10% by weight of non-colored particles. The colored resin particles used in the aqueous ink of the present invention are made of colored resin particles, are non-thermoplastic and have an average particle size of 1.0 to 15 μm, for example, resin particles Colored resin particles in which a coloring agent composed of a pigment is dispersed, colored resin particles coated on the surface of the resin particle with a coloring agent composed of a pigment, colored resin particles in which a coloring agent composed of a dye is dyed on resin particles Can be mentioned. In this embodiment, as long as the colored resin particles are non-thermoplastic and satisfy the above average particle diameter, the structure (hollow structure, no hollow structure (solid)), shape (spherical, polygonal, flat) The fibrous form is not particularly limited, but preferably, it has a glass transition point of 150 ° C. or higher and a thermal decomposition temperature in view of exhibiting excellent eraser erasability, writeability, and temporal stability as an ink. A spherical colored resin fine particle having an intramolecular cross-linking particle which has a melt flow index value of less than 0.1, is not tacky, and has an average particle diameter of 1.0 to 15 μm. Use is desirable. The “average particle diameter” defined in the present invention (including examples and the like) is a value of D50 measured by a particle size analyzer [Microtrac HRA 9320-X100 (manufactured by Nikkiso Co., Ltd.)].

  As a material for forming the erasing portion, that is, the erasing member 35, the erasing member 135 or the erasing member 335, thermosetting rubber such as silicone rubber, nitrile rubber, ethylene propylene rubber, ethylene propylene diene rubber, styrene elastomer, olefin elastomer, A rubber elastic material such as a thermoplastic elastomer such as a polyester elastomer, a mixture of two or more rubber elastic materials, and a mixture of a rubber elastic material and a synthetic resin are loaded by a wear test (ASTM D1044) specified in JIS K7204. In an environment of 9.8 N and 1000 rpm, the eraser is formed so that the amount of Taber abrasion on the abrasion wheel CS-17 of the Taber abrasion tester is 10 mg or more. Furthermore, in order to adjust the amount of Taber abrasion to be 10 mg or more, a phthalic acid based plasticizer may be added to the material of the erasing member in order to obtain more flexibility. When the erasing member contains a phthalic acid-based plasticizer, the erasing member is more easily worn, so that it is possible to erase the handwriting without damaging the paper surface and causing the printed characters and the like to be blurred. Further, the erasing member desirably has a durometer D hardness of 30 or more as defined in JIS K6203. As a result, a predetermined hardness can be secured, and a more stable rubbing operation is possible. The erasing member is also applicable as a touch pen or a stylus pen.

  The term "erasing" in the present invention refers to adsorption or scraping of drawn lines, characters and the like in an eraser such as an eraser, in addition to the case where the thermochromic ink is used. Furthermore, instead of the erasing member, the operation unit may be configured to be able to be used as a capacitive touch pen by imparting conductivity to a pressure-sensitive touch pen, a cylinder, or the like. Therefore, the present invention is also applicable to any writing instrument that erases written lines using an eraser.

DESCRIPTION OF SYMBOLS 1 writing instrument 4 axial cylinder 20 inner cylinder 30 operation part 40 rotor 50 knock lock member 60 latching part

Claims (3)

A knock-type writing tool comprising a shaft cylinder, an operating unit, and a rotor, and capable of switching between a writing state and a non-writing state by performing a knocking operation to press the operating portion forward.
A knock lock member movable in the longitudinal direction in the shaft cylinder by gravity and a locking portion provided on the inner surface of the shaft cylinder and capable of locking with the knock lock member are further provided.
When the front end of the barrel is directed upward, the knock lock member moves rearward and locks with the locking portion, thereby blocking the forward movement of the operation portion .
When the rotor or the operation portion has a cam surface facing the knock lock member, and the knock lock member has a cam receiving surface that cooperates with the cam surface, and the knock lock member moves rearward, A knock type writing instrument characterized in that the cam surface and the cam receiving surface cooperate with each other to rotate the knock lock member in the circumferential direction, and the locking portion and the knock lock member are locked . A knock-type writing tool comprising a shaft cylinder, an operating unit, and a rotor, and capable of switching between a writing state and a non-writing state by performing a knocking operation to press the operating portion forward.
A knock lock member movable in the longitudinal direction in the shaft cylinder by gravity and a locking portion provided on the inner surface of the shaft cylinder and capable of locking with the knock lock member are further provided.
When the front end of the barrel is directed upward, the knock lock member moves rearward and locks with the locking portion, thereby blocking the forward movement of the operation portion.
The knock lock member has a first protrusion and the locking portion has a second protrusion, and when the knock lock member rotates in the circumferential direction, the first protrusion and the second protrusion The knock-type writing instrument , wherein the knock lock member and the locking portion are in a locked state by locking the and. A knock-type writing tool comprising a shaft cylinder, an operating unit, and a rotor, and capable of switching between a writing state and a non-writing state by performing a knocking operation to press the operating portion forward.
A knock lock member movable in the longitudinal direction in the shaft cylinder by gravity and a locking portion provided on the inner surface of the shaft cylinder and capable of locking with the knock lock member are further provided.
When the front end of the barrel is directed upward, the knock lock member moves rearward and locks with the locking portion, thereby blocking the forward movement of the operation portion.
A knock-type writing tool is characterized in that a window is provided on the side surface of the barrel and the knock lock member is visible through the window when the knock lock member is near the front end or the rear end in the barrel. .

Images