JP7106432B2 - Retractable writing instrument - Google Patents

Description

The present invention relates to a retractable writing instrument.

2. Description of the Related Art A knock-type writing instrument having a cylindrically-shaped knock-lock member capable of moving back and forth in a barrel by gravity is known (Patent Document 1). In the knock-type writing instrument disclosed in Patent Document 1, when the front end faces upward, the knock lock member is engaged to prevent forward movement of the operating portion arranged at the rear end of the barrel, thereby preventing the knock-type writing instrument from moving forward. Operation is disabled. Therefore, when erasing handwriting with the knock-type writing instrument using the erasing member provided at the rear end of the operating portion, it is possible to perform a stable rubbing operation. That is, even if the erasing member is rubbed by pressing the erasing member against the writing surface by changing the grip of the knock-type writing instrument, the erasing member does not rattle.

JP 2016-107615 A

In the knock-type writing instrument disclosed in Patent Document 1, the cylindrical knock-lock member moves in the front-rear direction in the vicinity of the inner peripheral surface of the barrel due to gravity over a predetermined distance. There are restrictions on location. In order to widen the range of design of the internal mechanism, it is preferable to realize the prevention of forward movement of the operating portion with the front end facing upward by other mechanisms.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a knock-type writing instrument having a simple mechanism that enables stable rubbing action and the like.

According to one aspect of the present invention, there is provided a knock-type writing instrument that includes a barrel and an operating portion, and that can be switched between a writing state and a non-writing state by performing a knocking operation that pushes the operating portion forward. a brake member that can move back and forth in the shaft cylinder by gravity; a rotating member that moves together with the operating portion and can rotate about the central axis; and an engaging portion that can be engaged with the rotating member. Further, when the front end of the shaft cylinder is turned upward, the brake member moves rearward, the rotation of the rotating member is restricted, and the rotating member is locked with the locking portion, whereby the operation portion is controlled. There is provided a knock-type writing instrument characterized in that the forward movement of the is blocked.

The rotating member may be a cylindrical member. A protrusion may be provided on the inner surface of the rotating member, and the brake member inserted into the rotating member may engage with the protrusion, thereby restricting rotation of the rotating member. The rotating member has a first inclined surface that is circumferentially inclined with respect to a plane perpendicular to the front-rear direction, and the locking portion has a second inclined surface that is circumferentially inclined with respect to a plane perpendicular to the front-rear direction. A first inclined surface of the rotary member having an inclined surface and whose rotation is restricted may contact a second inclined surface of the engaging portion, thereby preventing forward movement of the operating portion. . The first slope or the second slope may have an inclination angle of greater than 45 degrees with respect to the axial direction of the knock-type writing instrument. a writing device comprising a plurality of writing bodies, a sliding member to which each of the writing bodies is connected, and a first cam surface disposed in front of the sliding member and cooperating with each of the sliding members; At least one of the sliding members and the first cam surface may be separated from each other in the state. All or part of the operation portion may be an erasing portion capable of erasing handwriting of the knock-type writing instrument.

ADVANTAGE OF THE INVENTION According to the aspect of this invention, there exists a common effect of providing the knock-type writing instrument provided with the simple mechanism which enables it to perform a stable rubbing operation.

1 is a perspective view of a writing instrument according to an embodiment of the invention; FIG. 1 is a vertical cross-sectional view of a writing instrument in a non-writing state with its front end facing downward; FIG. 1 is a vertical cross-sectional view of a writing instrument in a writing state with its front end facing downward; FIG. 1 is an enlarged vertical cross-sectional view of a writing instrument whose front end faces upward; FIG. Fig. 3 is a partial cross-sectional perspective view of the rear portion of the writing instrument; 1 is a rear perspective view of a writing instrument in a non-writing state; FIG. Figure 7 is a perspective view of the opposite side of the writing instrument of Figure 6; It is a longitudinal cross-sectional view of the rear axle. It is a longitudinal cross-sectional view of an inner cylinder. FIG. 3 is a perspective view of a spacer; Fig. 3 is a perspective view of a collar; It is a rear view of a rotating cam. It is a perspective view of a sliding piece. It is a perspective view of an operating member. It is a perspective view of a rotor. FIG. 4 is a perspective view of a brake rod; It is a perspective view of a knock ring. It is a schematic diagram explaining operation|movement of a knock ring. FIG. 4 is a cross-sectional view for explaining the operation of the brake rod; FIG. 5 is another schematic diagram for explaining the operation of the knock ring; FIG. 5 is another schematic diagram for explaining the operation of the knock ring; FIG. 5 is a schematic diagram for explaining the operation of refilling when a knocking operation is performed; It is a schematic diagram explaining switching operation|movement of the refill which can appear. FIG. 11 is a schematic diagram illustrating the operation of refilling when a knocking operation is performed in another embodiment; FIG. 4 is a perspective view of a writing instrument according to another embodiment of the present invention; It is a longitudinal cross-sectional view of the rear axle. FIG. 3 is a perspective view of a spacer; FIG. 5 is a schematic diagram for explaining the operation of refilling when a knocking operation is performed;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Corresponding elements are provided with common reference numerals throughout the drawings.

FIG. 1 is a perspective view of a writing instrument 1 according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional view of the writing instrument 1 in a non-writing state with the front end facing downward, and FIG. 4 is an enlarged longitudinal sectional view of the writing instrument 1 with its front end facing upward; FIG. 5 is a partially sectional perspective view of the rear part of the writing instrument 1; FIG. 7 is a perspective view of the rear of the writing instrument 1 in the writing state, FIG. 7 is a perspective view of the opposite side of the writing instrument 1 of FIG. 6. FIG.

A writing instrument 1 comprises a cylindrical barrel 4 having a front barrel 2 and a rear barrel 3, and a plurality of refills 5 arranged in the barrel 4 and having a writing portion 5a at one end. have. The front axle 2 and the rear axle 3 may be integrally formed. 6 and 7, the rear axle 3 is omitted.

In this specification, in the axial direction of the writing instrument 1, the side of the writing section 5a is defined as the "front" side, and the side opposite to the writing section 5a is defined as the "rear" side. Unless otherwise specified, the central axis or axial direction refers to the central axis or axial direction of the writing instrument 1 .

The writing instrument 1 is a knock-type writing instrument in which a refill 5 protrudes and retracts from a barrel 4 by a knocking operation that pushes an operating portion forward. The writing instrument 1 is also a multicore writing instrument having a plurality of refills 5 .

The writing instrument 1 has an inner cylinder 20 attached to the rear end of the rear barrel 3 and provided with a clip 28 . The inner cylinder 20 may also be called the shaft cylinder 4 . In the barrel 4, the writing instrument 1 includes a spacer 30, a collar member 40 arranged around the spacer 30, a rotating cam 50 arranged behind the collar member 40, and an inner cylinder 20 and the collar member 40. Sliding pieces 60, which are a plurality of sliding members arranged between them, an operation member 70 arranged behind the spacer 30, a rotor 80 arranged around the operation member 70, and the inside of the operation member 70 and a knock ring 100 arranged around the operating member 70 behind the rotor 80 .

The erasing member 7 is attached to the rear end of the operating member 70 via the holding member 6 . A cover member 8 is detachably attached to the holding member 6 , and the erasing member 7 is covered with the cover member 8 . The erasing member 7 is integrally provided with the holding member 6 by adhesion, two-color molding, or the like. The erasing member 7 may be detachable from the holding member 6, or a part of the holding member 6 may function as an erasing member. By pressing forward the cover member 8 in the attached state or the erasing member 7 in the state in which the cover member 8 is removed, the operation member 70 moves forward and a knocking operation is performed. In other words, the rear end of the writing instrument 1, that is, the erasing member 7 or the cover member 8 functions as an operating portion for knocking. It should be noted that all or part of the operation section may be an erasing section capable of erasing the handwriting of the writing instrument 1 . In FIGS. 4 and 5, the cover member 8 is omitted.

The holding member 6 is biased rearward by a rear spring 10 . Therefore, the holding member 6, the erasing member 7 and the cover member 8 are always arranged at the same position in the axial direction regardless of whether the writing instrument 1 is in the writing state or the non-writing state. Note that the rear spring 10 may be omitted. A front spring 11 is arranged in front of the collar member 40 , and the collar member 40 is biased rearward by the front spring 11 . An annular display member 12 is arranged between the front axle 2 and the rear axle 3 . The outer surface of the display member 12 is provided with two triangular marks pointing in opposite directions in the circumferential direction.

In FIGS. 2 to 4, upward is vertically upward, and downward is vertically downward. That is, gravity acts downward in each figure. As will be described later, the brake rod 90 can move in the longitudinal direction inside the shaft tube 4 by gravity. 2 and 3, the front end of the writing instrument 1, that is, the front end of the barrel 4 faces downward, so that the brake rod 90 is closer to the front end side in the barrel 4. As shown in FIG. On the other hand, in FIG. 4, since the front end of the writing instrument 1 faces upward, the brake rod 90 is closer to the rear end side in the barrel 4 than in FIGS.

The configuration of main components will be described with reference to FIGS. 1 to 7 as appropriate.

8 is a longitudinal sectional view of the rear barrel 3. FIG. When the writing instrument 1 is assembled, the rear barrel 3 is arranged such that the upper side thereof is the rear side of the writing instrument 1 in FIG. 8 . Two substantially T-shaped T-shaped protrusions 13 are provided on the inner peripheral surface of the rear axle 3 as a locking portion. The two T-shaped projections 13 are spaced apart by 120 degrees around the central axis. A plurality of annular grooves 14 spaced apart in the axial direction are formed in the inner peripheral surface of the front end portion of the rear axle 3 . The T-shaped protrusion 13 may be provided as a separate member instead of being provided on the inner peripheral surface of the rear axle 3, for example.

9 is a longitudinal sectional view of the inner cylinder 20. FIG. When the writing instrument 1 is assembled, the inner cylinder 20 is arranged such that the upper side thereof is on the rear side of the writing instrument 1 in FIG. 9 . The inner cylinder 20 is attached to the rear end portion of the rear axle 3 by fitting or press fitting. A stepped portion 21 facing rearward is formed on the inner peripheral surface of the inner cylinder 20 . Six first inner projections 22 extending in the axial direction are provided at equal intervals along the circumferential direction on the inner peripheral surface of the inner cylinder 20 ahead of the stepped portion 21 . A slope 22a inclined in the circumferential direction is formed on the front end face of each of the first inner projections 22 . The six first inner protrusions 22 constitute a first outer cam 23 . A rear end portion of each of the first inner projections 22 is formed with a second inner projection 24 that protrudes further than the first inner projection 22 as a locking portion. A sloped surface 24a inclined in the circumferential direction is formed on the rear end surface of each of the second inner projections 24, and a partial sloped surface 24b inclined in the circumferential direction is formed on a part of the front end surface of each of the second inner projections 24 (described below). (see FIG. 18A) is formed. Six second inner protrusions 24 constitute a second outer cam 25 . A rectangular recess 26 is formed at the front end of the inner cylinder 20 .

10 is a perspective view of the spacer 30. FIG. The spacer 30 is arranged so that the upper side thereof is the rear side of the writing instrument 1 in FIG. 10 when the writing instrument 1 is assembled. The spacer 30 includes a cylindrical body portion 31, three rail portions 32 extending rearward from the rear end portion of the body portion 31, and a connecting portion formed to connect the rear end portions of the three rail portions 32. a portion 33; The connecting portion 33 includes two connecting pieces 33a each having an outer circumference smaller than the outer diameter of the three rail portions 32 and one connecting piece 33a formed as an extension of the rail portion 32 or having a larger diameter than the connecting piece 33a. and one rotation restricting piece 33b. Two adjacent rail portions 32 and connecting portion 33 define three grooves into which refills 5 can be inserted. That is, in this embodiment, the writing instrument 1 can accommodate three refills 5 . A flange portion 34 is formed on the outer peripheral surface of the body portion 31 , and the outer peripheral surface of the body portion 31 is divided into front and rear by the flange portion 34 . A projecting mark portion 35 extending forward is formed on the front end surface of the flange portion 34 . The mark portion 35 fits into the concave portion of the display member 12 (FIG. 1). A male threaded portion 36 is formed in the front portion of the body portion 31 , and the spacer 30 is screwed to the front shaft 2 by the male threaded portion 36 . A plurality of annular protrusions 37 are formed on the rear portion of the body portion 31 and are spaced apart in the axial direction.

11 is a perspective view of the collar member 40. FIG. When the writing instrument 1 is assembled, the collar member 40 is arranged such that the upper side thereof is the rear side of the writing instrument 1 in FIG. 11 . The collar member 40 is formed in a tubular shape as a whole. Two T-shaped recesses 41 are formed on the outer peripheral surface of the collar member 40 at positions corresponding to the T-shaped protrusions 13 of the rear axle 3 and having complementary shapes. A portion of the rear end surface corresponding to the space between the two T-shaped recesses 41 is formed with a raised portion 42 which is raised stepwise. A part of the rear end surface of the collar member 40 is formed with a notch portion 43 obliquely notched forward from the rear end side (FIG. 7). A rear end surface of the collar member 40 including the end surface of the notch 43 constitutes a first cam surface 44 .

12 is a rear view of the rotating cam 50. FIG. The rotating cam 50 is arranged so that the upper side thereof is the rear side of the writing instrument 1 in FIG. 12 when the writing instrument 1 is assembled. The rotating cam 50 has an annular portion 51 annularly formed around the central axis and a claw portion 52 having a claw shape. The annular portion 51 is formed to be attached to the inner surface of the rear end portion of the claw portion 52 . A protruding guide projection 53 is formed on the inner surface of the claw portion 52 so as to extend forward from the front end surface of the annular portion 51 . As shown in FIG. 7 , the outer shape of the rear portion of the claw portion 52 is formed in a rectangular shape complementary to the concave portion 26 of the inner cylinder 20 . Therefore, when the writing instrument 1 is in a non-writing state, the pawl portion 52 fits into the concave portion 26 of the inner cylinder 20 , and the outer surface of the rotating cam 50 is flush with the outer peripheral surface of the inner cylinder 20 . Also, the outer diameter of the annular portion 51 is slightly smaller than the inner diameter of the inner cylinder 20 . A front portion of the claw portion 52 has a flat surface 54 formed flat and an end surface 55 formed obliquely. The flat surface 54 and the end surface 55 of the claw portion 52 form a second cam surface 56 together with the front end surface 27 (FIG. 9) of the inner cylinder 20 .

13 is a perspective view of the sliding piece 60. FIG. When the writing instrument 1 is assembled, the sliding piece 60 is arranged such that its upper side is the rear side of the writing instrument 1 in FIG. 13 . The sliding piece 60 has an insertion portion 61 inserted into the rear end portion of the refill 5 and a slider 62 formed on the side surface of the insertion portion 61 . Since the slider 62 slides along the first cam surface 44 as will be described later, minute projections 63 are formed on the front end face of the slider 62 so as to reduce frictional resistance during sliding. . Since the slider 62 slides along the second cam surface 56, the rear end surface of the slider 62 may be formed with similar minute protrusions.

14 is a perspective view of the operating member 70. FIG. When the writing instrument 1 is assembled, the operating member 70 is arranged such that the upper side thereof is the rear side of the writing instrument 1 in FIG. 14 . The operating member 70 is a hollow member with an open front end and a closed rear end. A cam flange 71 is formed on the outer peripheral surface of the operating member 70 . A rotary cam surface 72 consisting of symmetrical and continuous peaks and valleys is formed on the front end face of the cam flange 71 . Six guide grooves 73 extending in the axial direction are formed on the outer peripheral surface of the cam flange 71 at regular intervals along the circumferential direction. Two rectangular through-holes 74 extending in the axial direction are formed in the outer peripheral surface of the operating member 70 behind the cam flange 71 at a distance of 180 degrees around the central axis. On the outer peripheral surface of the operating member 70 , a rearward-facing stepped portion 75 is formed behind the through hole 74 , and a fitting protrusion 76 is formed behind the stepped portion 75 . When the holding member 6 is attached to the rear end portion of the operating member 70 , the fitting protrusion 76 fits into the opening provided in the holding member 6 .

15 is a perspective view of the rotor 80. FIG. The rotor 80 is arranged such that its upper side is the rear side of the writing instrument 1 in FIG. 15 when the writing instrument 1 is assembled. The rotor 80 is a cylindrical member. A rotating cam receiving surface 81 formed complementarily to the rotating cam surface 72 of the operating member 70 is formed on the rear end surface of the rotor 80 . The rotary cam receiving surface 81 cooperates with the rotary cam surface 72 of the operating member 70 . Six projections 82 extending in the axial direction and arranged at regular intervals along the circumferential direction are formed on the outer peripheral surface of the rotor 80 , and the rear end surfaces of the projections 82 constitute a first inner cam 83 . Six locking grooves 84 extending in the front-rear direction are defined by two adjacent projections 82 . A locking portion 85 is formed on the rear end face of each projection 82 .

16 is a perspective view of the brake rod 90. FIG. The brake rod 90 is arranged so that the upper side thereof is the rear side of the writing instrument 1 in FIG. 16 when the writing instrument 1 is assembled. Brake rod 90 is a solid member. A small-diameter portion 91 is formed at the rear end portion of the brake rod 90 , and a large-diameter portion 92 having a larger diameter is formed in front of the small-diameter portion 91 . The small diameter portion 91 and the large diameter portion 92 are connected by a tapered surface 93 . Two rectangular protrusions 94 are formed on the outer peripheral surface of the large-diameter portion 92 and extend in the axial direction at a distance of 180 degrees around the central axis. A restriction 95 is defined.

17 is a perspective view of the knock ring 100. FIG. The knock ring 100 is arranged so that the upper side thereof is the rear side of the writing instrument 1 in FIG. 17 when the writing instrument 1 is assembled. The knock ring 100 is a cylindrical member. Two restricting protrusions 101 are formed on the inner peripheral surface of the knock ring 100 and extend in the axial direction at a distance of 180 degrees around the central axis. Four right-angled triangular first outer protrusions 102 are formed on the outer peripheral surface of the front end portion of the knock ring 100 . Two first outer protrusions 102 are spaced 60 degrees about the central axis, and the corresponding other two first outer protrusions 102 are spaced 180 degrees from each other about the central axis. . A parallelogram-shaped second outer protrusion 103 is formed behind each of the first outer protrusions 102 . The first outer protrusion 102 and the second outer protrusion 103 constitute a second inner cam 104 .

Next, the combination and arrangement of each part in the writing instrument 1 will be described with reference to FIGS. 1 to 7. FIG.

The spacer 30 is screwed onto the front shaft 2 via a male threaded portion 36 . The front end portion of the rear axle 3 is inserted into the rear portion of the body portion 31 of the spacer 30 . At this time, each of the annular projections 37 of the spacer 30 is fitted into the corresponding annular groove 14 of the rear axle 3, so that the rear axle 3 does not easily come off from the spacer 30 and thus the front axle 2. rotatably connected. Front spring 11 and collar member 40 are positioned around rail portion 32 of spacer 30 . The front end of the front spring 11 is supported by the rear end surface of the body portion 31 of the spacer 30 , and the rear end of the front spring 11 is in contact with the front end surface of the collar member 40 . The collar member 40 is movable in the front-rear direction and is biased rearward by the front spring 11 . Each of the T-shaped protrusions 13 of the rear axle 3 is accommodated in the corresponding T-shaped recess 41 of the collar member 40, thereby restricting the rotation of the collar member 40 around its central axis. Therefore, when the rear axle 3 is rotated with respect to the front axle 2 , the collar member 40 rotates together with the rear axle 3 .

The refills 5 and the sliding piece 60 are connected by inserting the insertion portion 61 of the sliding piece 60 into the rear end of each of the three refills 5 . In this state, each refill 5 is inserted into the groove between the rail portions 32 of the spacer 30 and is movable in the front-rear direction. At this time, the slider 62 of the sliding piece 60 protrudes radially outward from the rail portion 32 of the spacer 30 . The slider 62 is engaged with the edge of the rail portion 32 to prevent the refill 5 from falling out from between the rail portions 32 . The slider 62 , particularly the micro-projection 63 of the slider 62 , abuts the first cam surface 44 of the collar member 40 . At this time, one of the sliders 62 of the three sliding pieces 60 is arranged on the first cam surface 44 of the notch 43 of the collar member 40, and the remaining sliders 62 are located on the collar member 40. It is arranged on the first cam surface 44 on the rear end surface.

Since the collar member 40 is urged rearward by the front spring 11 , each of the sliding pieces 60 is also urged rearward through the collar member 40 , and furthermore, through the sliding pieces 60 , the rotary cam 50 is pushed backward. is also biased backwards. The rearward movement of the collar member 40 and, in turn, the sliding piece 60 is restricted by the contact of the rear end surface of the slider 62 with the second cam surface 56 of the rotary cam 50 including the front end surface 27 of the inner cylinder 20. be. Therefore, each of the sliders 62 of the sliding piece 60 is arranged between the first cam surface 44 and the second cam surface 56 . The claw portion 52 of the rotating cam 50 is movable in the front-rear direction within the concave portion 26 of the inner cylinder 20 . At this time, the annular portion 51 of the rotating cam 50 slides along the inner peripheral surface of the inner cylinder 20 .

The operating member 70 is arranged inside the barrel 4 such that each of the first inner projections 22 of the inner barrel 20 is arranged in the corresponding guide groove 73 . As a result, the operating member 70 can move in the longitudinal direction within the barrel 4 without rotating during the knocking operation. The front end of the rear spring 10 is supported by the stepped portion 21 of the inner cylinder 20 , and the rear end of the rear spring 10 is in contact with the holding member 6 . As a result, the rear spring 10 urges the holding member 6 and thus the operation member 70 to which the holding member 6 is attached rearward. The rearward movement of the operating member 70 is restricted by the contact of the rear end surface of the cam flange 71 with the front end surface of the second inner projection 24 of the inner cylinder 20 .

A rotor 80 is arranged movably and rotatably in the front-rear direction on the outer peripheral surface of the operation member 70 in front of the cam flange 71 . At this time, the first inner cam 83 of the rotor 80 is arranged to cooperate with the first outer cam 23 of the inner cylinder 20 . In the writing instrument 1 in the non-writing state (FIG. 2), the front end of the rotor 80 is inserted into the annular portion 51 of the rotating cam 50, and the front end face of the protrusion 82 of the rotor 80 is aligned with the annular portion 51 of the rotating cam 50. It is in contact with the rear end surface. At this time, the rear end surface of the rotor 80 , that is, the rotary cam receiving surface 81 is in contact with the rotary cam surface 72 of the operating member 70 . As described above, since the rotary cam 50 is urged rearward by the front spring 11 through the sliding piece 60, the rotor 80 and the operating member 70 in contact with it are also urged rearward. there is

A brake rod 90 is arranged inside the operating member 70 and thus the rotor 80 . The brake rod 90 can move forward and backward within the operation member 70 by gravity. Forward movement of the brake rod 90 is restricted by contact with the rear end surface of the spacer 30 , that is, the rear end surface of the connecting portion 33 . Rearward movement of the brake rod 90 is restricted by the engagement of the tapered surface 93 of the brake rod 90 with the inner surface of the operating member 70 (FIG. 4).

A knock ring 100 is rotatably arranged around the through hole 74 of the operating member 70 , and the knock ring 100 can move together with the operating member 70 in the front-rear direction. Specifically, the knock ring 100 is arranged between the cam flange 71 of the operating member 70 and the holding member 6 attached to the operating member 70 , and is restricted from moving forward and backward with respect to the operating member 70 . At this time, as will be described later with reference to FIG. It is rotatable within a range of a predetermined angle within 74 . Furthermore, the second inner cam 104 of the knock ring 100 is arranged to cooperate with the second outer cam 25 of the inner cylinder 20 .

Next, the operation of the writing instrument 1 will be described.

The writing instrument 1 is switched between the writing state and the non-writing state by performing a knocking operation to push forward the operating portion at the rear end of the writing instrument 1 against the urging forces of the rear spring 10 and the front spring 11 . However, its basic operation will be explained. Switching between the writing state and the non-writing state is performed by the first inner cam 83 of the rotor 80 and the first inner cam 83 of the inner cylinder 20 by the cooperation of the rotating cam surface 72 of the operating member 70 and the rotating cam receiving surface 81 of the rotor 80 . This is done by the cooperation of the outer cams 23 . Since the cooperative operation between these cams is the same as that of a conventional knock-type writing instrument, it will be briefly described below.

In the non-writing state, the rotor 80 has each of the projections 82 arranged between the first inner projections 22 of the inner cylinder 20, thereby restricting the rotation of the rotor 80. As shown in FIG. In other words, the first inner projection 22 of the inner cylinder 20 is arranged inside the locking groove 84 of the rotor 80 . Therefore, the rotation of rotor 80 is restricted. At this time, the rotating cam surface 72 of the operating member 70 and the rotating cam receiving surface 81 of the rotor 80 are in contact with each other, but are out of phase with each other.

When the operating member 70 is moved forward by the knocking operation, the rotor 80 is pushed forward by the cam flange 71 . When the rotor 80 moves forward, the sliding piece 60 having the slider 62 arranged in the notch 43 of the collar member 40 and the collar member 40 are pushed forward by being pressed by the claw portion 52 . Move to As a result, the refill 5 connected to this sliding piece 60 protrudes from the barrel 4 .

When the rotor 80 moves forward and the rear end of the projection 82 passes over the front end of the first inner projection 22 of the inner cylinder 20 in the front-rear direction, the regulation of rotation of the rotor 80 is released. At that moment, a component of force in the circumferential direction acts to restore the phase difference between the rotating cam surface 72 of the operating member 70 and the rotating cam receiving surface 81 of the rotor 80, and this component of force acts on the rotor 80. rotate slightly.

Next, when the knocking operation is stopped, the biasing force of the front spring 11 slightly moves the sliding piece 60, the rotating cam 50, the rotor 80 and the operating member 70 rearward via the collar member 40. As shown in FIG. At this time, the first inner cam 83 of the rotor 80 and the first outer cam 23 of the inner cylinder 20 cooperate to rotate the rotor 80 further. That is, the inclined surface 22a of the first inner projection 22 of the inner cylinder 20 and the rear end surface of the projection 82 of the rotor 80, which are inclined in the same direction, come into contact with each other, and a component of force in the circumferential direction acts. The force causes rotor 80 to rotate a little further. Due to this rotation, the rotation cam surface 72 of the operating member 70 and the rotation cam receiving surface 81 of the rotor 80 are out of phase again. Rotation and rearward movement of the rotor 80 are restricted by locking the first inner projections 22 of the inner cylinder 20 to the locking portions 85 of the rotor 80 . As a result, the refill 5 is kept protruding from the barrel 4, and the writing instrument 1 is ready for writing.

In order to switch from the writing state to the non-writing state, the knock operation is performed again. When the operation member 70 moves forward by the knocking operation, the cam flange 71 pushes the rotor 80 forward. When the rotor 80 moves forward and the rear end of the projection 82 passes over the front end of the first inner projection 22 of the inner cylinder 20 in the front-rear direction, the regulation of rotation of the rotor 80 is released. At that moment, a component of force in the circumferential direction acts to restore the phase difference between the rotating cam surface 72 of the operating member 70 and the rotating cam receiving surface 81 of the rotor 80, and this component of force acts on the rotor 80. rotate slightly.

Next, when the knocking operation is stopped, the biasing force of the front spring 11 slightly moves the sliding piece 60, the rotating cam 50, the rotor 80 and the operating member 70 rearward via the collar member 40. As shown in FIG. At this time, the first inner cam 83 of the rotor 80 and the first outer cam 23 of the inner cylinder 20 cooperate to rotate the rotor 80 further. That is, the inclined surface 22a of the first inner projection 22 of the inner cylinder 20 and the rear end surface of the projection 82 of the rotor 80, which are inclined in the same direction, come into contact with each other, and a component of force in the circumferential direction acts. The force causes rotor 80 to rotate a little further. Due to this rotation, the rotation cam surface 72 of the operating member 70 and the rotation cam receiving surface 81 of the rotor 80 are out of phase again. Rotation of the rotor 80 is restricted by having each of the projections 82 of the rotor 80 again arranged between the first inner projections 22 of the inner cylinder 20 . The rearward movement of the rotor 80 is restricted by the cam flange 71 of the operating member 70 . Due to the rearward movement of the rotor 80, the collar member 40, the sliding piece 60 and the rotating cam 50 biased by the front spring 11 also move rearward. As a result, the refill 5 is in a state of being retracted into the barrel 4, and the writing instrument 1 is in a non-writing state.

The knocking operation for switching between the writing state and the non-writing state described above is performed with the front end of the writing instrument 1 facing downward. On the other hand, when the front end of the writing instrument 1 faces upward, the knocking operation cannot be performed. That is, even if an attempt is made to press the operating portion forward, the movement of the operating member 70 is blocked and the operating member 70 cannot be moved forward. This will be explained below.

18A and 18B are schematic diagrams for explaining the operation of the knock ring 100. FIG. FIG. 18 shows the positional relationship of the second inner cam 104 of the knock ring 100 with respect to the second outer cam 25 developed in the circumferential direction. The positional relationship between the first outer protrusion 102 and the second outer protrusion 103 is shown. In FIG. 18 , the upper side is the rear side of the writing instrument 1 and the lower side is the front side of the writing instrument 1 . FIG. 18(A) shows the state before the knocking operation is performed, FIG. 18(B) shows the state immediately after the operating portion starts to move forward due to the knocking operation, and FIG. FIG. 18D shows a state immediately before the operation portion returns to its original position due to the stopping of the knock operation.

Referring to FIG. 18(A), the second inner projection 24 of the inner cylinder 20 is arranged in front of the second outer projection 103 of the knock ring 100 before the knocking operation is performed. When the knocking operation is performed in this state, the operating member 70 moves forward relative to the inner cylinder 20, and therefore the knock ring 100 also moves forward. At this time, the second outer cam 25 of the inner cylinder 20 and the second inner cam 104 of the knock ring 100 cooperate to rotate the knock ring 100 . That is, the slope 24a of the second inner projection 24 of the inner cylinder 20 and the front end face of the second outer projection 103 of the knock ring 100, which have slopes inclined in the same direction, come into contact with each other, and a component of force in the circumferential direction acts. The knock ring 100 rotates while moving forward (FIG. 18(B)). When the operating member 70 moves further forward, the second inner projection 24 of the inner cylinder 20 passes by the second outer projection 103, and the knock ring 100 and thus the operating member 70 can be sufficiently moved forward. (FIG. 18(C)), a knocking operation is performed.

When the knocking operation is stopped from the state shown in FIG. 18(C), the biasing force of the rear spring 10 causes the operating member 70 to move rearward relative to the inner cylinder 20, and thus the knock ring 100 also moves rearward. Moving. At this time, the second outer cam 25 of the inner cylinder 20 and the second inner cam 104 of the knock ring 100 cooperate to rotate the knock ring 100 in the opposite direction. That is, the partial slope 24b of the second inner projection 24 of the inner cylinder 20 and the rear end surface of the first outer projection 102 of the knock ring 100, which have slopes inclined in the same direction, come into contact with each other, and a component of force in the circumferential direction acts. As a result, the knock ring 100 rotates while retreating (Fig. 18(D)). As a result, the knock ring 100 and thus the operating member 70 return to their original positions (FIG. 18(A)).

As described above, when the front end of the writing instrument 1 faces downward, the knock ring 100 rotates in response to the knock operation, so that the operation member 70, that is, the operation portion, can be knocked without being prevented from moving forward. becomes possible. On the other hand, when the front end of the writing instrument 1 faces upward, the rotation of the knock ring 100 is restricted by the brake rod 90, preventing forward movement of the operating portion and knocking operation. Such a knock lock mechanism will be described with reference to FIG.

19A and 19B are cross-sectional views illustrating the operation of the brake rod 90. FIG. 19(A) is a cross-sectional view taken along line AA in FIG. 3 with the front end of the writing instrument 1 facing downward, and FIG. 19(B) is a cross-sectional view of FIG. 4 with the front end of the writing instrument 1 facing upward. It is a cross-sectional view taken along line BB.

As shown in FIG. 19A, when the front end of the writing instrument 1 faces downward, the restriction projections 101 of the knock ring 100 are arranged in the through holes 74 of the operation member 70, respectively. FIG. 19(A) shows a state before the knocking operation is performed, as in FIG. 18(A). Therefore, the knock ring 100 is rotatable within a range of a predetermined angle within the range of regulation that the regulation projection 101 receives from the edge of the through hole 74 .

As shown in FIG. 19B, when the front end of the writing instrument 1 faces upward, the regulating protrusions 101 of the knock ring 100 are arranged in the through holes 74 of the operating member 70, respectively. A restricting portion 95 is arranged so as to fill the gap between. That is, when the front end of the writing instrument 1 faces upward, the brake rod 90 moves backward due to gravity. Thereby, the brake rod 90 is inserted further inside the operating member 70 , and the restricting portion 95 is inserted into the clearance of the through hole 74 . As a result, the restricting protrusion 101 of the knock ring 100 engages with the restricting portion 95 of the brake rod 90 , thereby restricting the rotation of the knock ring 100 .

If the knock ring 100 cannot rotate, as described with reference to FIG. Even if it contacts, the knock ring 100 will not rotate. As a result, the second inner projection 24 of the inner cylinder 20 and the second outer projection 103 of the knock ring 100 are locked, and further forward movement of the operating member 70 is prevented. Therefore, when the front end of the writing instrument 1 faces upward, the forward movement of the operating portion is blocked, and the knocking operation cannot be performed.

When the front end of the writing instrument 1 is turned from the upward state to the downward state, the brake rod 90 moves forward, and the restriction on the rotation of the knock ring 100 is released. As a result, the knock operation can be performed again.

Since the forward movement of the operating portion of the writing instrument 1 is blocked when the front end of the writing instrument 1 faces upward, for example, when erasing handwriting with the writing instrument 1 using the erasing member 7, it is possible to perform a stable rubbing operation. Become. That is, even if the writing instrument 1 is changed and the operation part is pressed against the writing surface to perform a rubbing action, the operation part does not rattle. According to the writing instrument 1, a stable rubbing action can be achieved with a simpler mechanism than the conventional one.

For example, the conventional knock lock mechanism described in Patent Document 1 (Japanese Patent Application Laid-Open No. 2016-107615) has a single knock lock member. It was configured to block the forward movement of the operation unit. On the other hand, the knock lock mechanism of the writing instrument 1 has a brake rod 90 and a knock ring 100 . Therefore, the members responsible for movement and rotation are separated such that the brake rod 90 only moves due to gravity and the knock ring 100 only rotates. As a result, the knock lock mechanism of the writing instrument 1 can have a shorter overall length as a mechanical part than the knock lock mechanism of Patent Document 1, and the shape and arrangement of parts of the internal mechanism such as the vicinity of the inner peripheral surface of the barrel can be reduced. You can have more freedom in designing the location.

The brake rod may be a brake member of any shape as long as it can move back and forth in the barrel by gravity. Further, the knock ring may be a C-shaped member that is not completely annular, or may be a rotating member of any shape as long as it can move with the operating portion and rotate around the central axis. When the front end of the shaft tube is directed upward, the brake member moves rearward, restricting the rotation of the rotary member and locking the rotary member with the locking portion, thereby preventing forward movement of the operating portion. Any shape can be adopted for the brake member and the rotary member as long as

By the way, if the writing instrument 1 is accidentally dropped with the front end of the writing instrument 1 facing upward, a strong axial impact is applied to the operating portion. At this time, the slope 24a of the second inner projection 24 of the inner cylinder 20 collides with the front end face of the second outer projection 103 of the knock ring 100, and the second inner projection 24 deforms so as to expand in the circumferential direction. Then, the deformed second inner projection 24 cannot pass between the adjacent second outer projections 103 of the knock ring 100 as shown in FIG. Also, even if the deformed second inner projection 24 could pass between the adjacent second outer projections 103 of the knock ring 100, the deformed second inner projection 24 would be caught between the second outer projections 103, There is a possibility that the operation unit cannot return to its original position. This will be described with reference to FIG.

FIG. 20 is another schematic diagram for explaining the operation of the knock ring 100. FIG. 20 is a view similar to FIG. 18, in which the upper side is the rear side of the writing instrument 1 and the lower side is the front side of the writing instrument 1. FIG. The knock ring 100 shown in FIG. 20 has the second outer protrusion 103 corresponding to the second inner protrusion 24 passing between the adjacent second outer protrusions 103, that is, the right side in the drawing. is formed shorter in the axial direction. That is, the front end face of the second outer protrusion 103 on the right side in the drawing is formed to be arranged rearward from the front end face of the other second outer protrusion 103 .

FIG. 20A shows the rear end surface of the second inner projection 24 of the inner cylinder 20 that does not pass between the adjacent second outer projections 103 and the corresponding second outer projection 103 of the knock ring 100 when the writing instrument 1 is dropped. It shows the moment of collision with the front end face. At this time, the other second inner projection 24 of the inner cylinder 20 collides with the second outer projection 103 because the front end surface of the corresponding second outer projection 103 of the knock ring 100 is arranged further rearward. not. In FIG. 20B, as a result of the collision, the second inner projection 24 of the inner cylinder 20 that does not pass between the adjacent second outer projections 103 has a deformed portion 24c. At this time, since the second inner projection 24 of the other inner cylinder 20 is not deformed, it can pass between the adjacent second outer projections 103 and does not affect the knocking operation.

By the way, in a normal knock operation, when the rear end surface of the second inner projection 24 of the inner cylinder 20 and the front end surface of the second outer projection 103 of the knock ring 100 come into contact with each other, the second inner cylinder 20 is knocked. In some cases, the protrusion 24 and the second outer protrusion 103 of the knock ring 100 are engaged with each other, and the knock ring 100 cannot be rotated. This will be described with reference to FIG.

FIG. 21 is another schematic diagram for explaining the operation of the knock ring 100. FIG. 21 is a view similar to FIG. 18, in which the upper side is the rear side of the writing instrument 1 and the lower side is the front side of the writing instrument 1. FIG. In FIG. 21, the angle α of the front end of the second outer projection 103 of the knock ring 100, especially the second outer projection 103 on the left side in the drawing, is set within the range of 45 degrees to 90 degrees. Unintended engagement between the second inner projection 24 and the second outer projection 103 of the knock ring 100 can be prevented.

As described above, the operation member 70, the rotor 80 and the rotating cam 50 move forward by performing the knocking operation. When the rotating cam 50 moves forward, the claw portion 52 presses the sliding piece 60 having the slider 62 arranged in the notch portion 43 of the collar member 40 and the collar member 40 forward. Move to As a result, the writing portion 5a of the refill 5 connected to the slide piece 60 protrudes from the barrel 4. As shown in FIG. The operation of projecting a predetermined refill 5 will be described with reference to FIG.

22A and 22B are schematic diagrams for explaining the operation of the refill at the time of the knocking operation. As described above, each of the sliders 62 of the sliding piece 60 is arranged between the first cam surface 44 and the second cam surface 56, and in FIG. As shown, left and right are connected in each figure. Each slide piece 60 cooperates with the first cam surface 44 and the second cam surface 56 . A circle mark attached to one of the three sliding pieces 60 is a mark drawn for convenience to identify the sliding piece 60 . In FIG. 22 , the upper side is the rear side of the writing instrument 1 and the lower side is the front side of the writing instrument 1 . FIG. 22(A) shows the collar member 40, the rotating cam 50, and the sliding piece 60 in the non-writing state of the writing instrument 1, and FIG. 22(C) shows the collar member 40, the rotating cam 50 and the sliding piece 60 in the writing state of the writing instrument 1. FIG. 22 schematically shows the T-shaped protrusion 13 provided on the inner peripheral surface of the rear axle 3. As shown in FIG.

When the knocking operation is performed from the state shown in FIG. 22(A), the rotation cam 50 also moves forward due to the forward movement of the operating member 70, and the ◯ mark arranged in the notch 43 is attached. The sliding piece 60 and the collar member 40 move forward. At this time, the remaining two slide pieces 60 are engaged with the T-shaped protrusion 13 provided on the inner peripheral surface of the relatively stationary rear axle 3 (FIG. 22(B)). Therefore, it can be said that the first cam surface 44 includes the rear end surface of the T-shaped projection 13 . Next, when the rotating cam 50 moves further, the first inner cam 83 of the rotor 80 and the first outer cam 23 of the inner cylinder 20 cooperate as described above, and the writing instrument 1 enters the writing state (FIG. 22 ( C)). At this time, since the remaining two sliding pieces 60 are engaged with the T-shaped projections 13 provided on the inner peripheral surface of the rear axle 3, they do not move forward.

If the T-shaped protrusion 13 were not present, the refills 5 other than the refills 5 protruding from the barrel 4 would also move forward due to gravity. As a result, a plurality of refills 5 are gathered at the tapered portion of the front end of the front barrel 2, which may hinder the movement of the refills 5 to be protruded. Therefore, the writing instrument 1 is provided with a T-shaped projection 13, and by locking the other refill 5 to this, the unnecessary forward movement of the other refill 5 is restricted. Therefore, the T-shaped protrusion 13 can have any shape as long as it can lock the refill 5 .

As is clear from FIG. 22, by knocking, the refill 5 connected to the sliding piece 60 moving relatively forward among the three refills 5 protrudes from the front end opening of the barrel 4, and the writing instrument 1 is It becomes a writing state. Therefore, by arranging the writing portion 5a of the refill 5, which moves relatively forward in the non-writing state of the writing instrument 1, in the vicinity of the front end opening of the barrel 4, a smaller knocking operation amount, i.e., With a smaller knock stroke, the refill 5 can be protruded into a writing state. Further, when the knocking operation is performed, the second cam surface 56 itself of the rotating cam 50 advances and presses the sliding piece 60, so that rattling between parts can be suppressed. Also, the rotary cam 50, particularly the pawl portion 52, can be a relatively large component, and the strength thereof can be increased.

23A and 23B are schematic diagrams for explaining the switching operation of the refill 5 that can appear, that is, the operation for changing the refill 5 for writing. 23 is a view similar to FIG. 22, in which the upper side is the rear side of the writing instrument 1 and the lower side is the front side of the writing instrument 1. FIG. Spacer 30 is fixed to front axle 2 . On the other hand, the inner cylinder 20, the collar member 40, the rotating cam 50 and the rear shaft 3 are rotatable with respect to the front shaft 2 and constitute a rotation selection member. In other words, the front axle 2 is rotatable with respect to the rear axle 3 .

23, the rotation of the rear axle 3 with respect to the front axle 2 is based on the rear axle 3 for convenience of explanation. Moving. Actually, the sliding piece 60 only moves in the groove between the rail portions 32 of the spacer 30 in the front-rear direction. For convenience of explanation, the three sliding pieces 60 are distinguished as a sliding piece 60A, a sliding piece B and a sliding piece 60C. As described above, when the knocking operation is performed, the refill 5 connected to the slide piece 60 arranged in the cutout portion 43 of the collar member 40 , that is, the refill 5 arranged at the selected position is pushed into the claw portion 52 . It is pressed and protrudes from the barrel 4 . Therefore, by changing the refill 5 arranged at the selected position, the desired refill 5 can appear and disappear. Furthermore, for convenience of explanation, it is assumed that the rear axle 3 is freely rotatable with respect to the front axle 2 .

FIG. 23(A) shows a state in which the sliding piece 60A is arranged at the advanced position in the writing instrument 1 in the non-writing state. When the knocking operation is performed in this state, the refill 5 connected to the slide piece 60A is brought into the writing state as described above. At this time, as described with reference to FIG. 22, the other sliding pieces 60B and 60C engage with the T-shaped projection 13 provided on the inner peripheral surface of the rear axle 3, and move forward. movement is restricted.

In the state shown in FIG. 23(A), when the rear barrel 3 is rotated clockwise with respect to the front barrel 2 as seen from the rear of the writing instrument 1, each of the sliding pieces 60 moves rightward in the drawing. Move relatively. At this time, as the rear axle 3 rotates, that is, the collar member 40 rotates, the sliding piece 60A, which has been disposed in the forward position, moves rearward along the slope of the first cam surface 44, and the sliding piece 60A moves backward. 60B rides on the raised portion 42 against the biasing force of the front spring 11 (FIG. 23(B)). Since the sliding piece 60B rides on the raised portion 42, the collar member 40 moves forward by the height of the raised portion 42 compared to the state shown in FIG. 23(A).

Further, when the rear shaft 3 is rotated, the sliding piece 60B relatively moves along the raised portion 42 in the circumferential direction, and the sliding piece 60C moves forward along the end surface 55 of the rotating cam 50 (Fig. 23(C)). Next, at the moment when the sliding piece 60B passes over the end of the raised portion 42, the collar member 40, which had moved forward by the height of the raised portion 42, momentarily moves backward due to the biasing force of the front spring 11. (Fig. 23(D)). At this time, the sliding piece 60B collides with the rear end face of the collar member 40. As shown in FIG. At the same time, the sliding piece 60C collides with the end surface of the notch 43 of the collar member 40. As shown in FIG. At the same time, the sliding piece 60A collides with the front end face 27 of the inner cylinder 20. As shown in FIG. As a result, the sliding piece 60C is arranged in the notch 43 of the collar member 40, and the switching of the refill 5 is completed (FIG. 23(E)). Since these collisions occur substantially at the same time, the user who is rotating the rear axle 3 can feel the impact and the click sound caused by the impact, indicating that the switching operation of the refillable refills 5 has been completed. can recognize. Note that the raised portion 42 may be omitted.

The torque required to start rotating the rear barrel 3 for switching the retractable refill 5, that is, the initial torque, can be obtained by changing the height of the stepped raised portion 42, the shape of the stepped portion, and the like. can be changed to the desired value. By appropriately adjusting the initial torque in consideration of the frictional resistance, etc. associated with the movement of the slide piece 60, when a torque greater than the initial torque is applied and rotated, the inertial force will cause the refill 5 to instantly move to the adjacent refill 5. can be switched.

24A and 24B are schematic diagrams illustrating the operation of the refill 5 at the time of the knocking operation in another embodiment. FIG. 24 is a view similar to FIG. 22, with the upper side being the rear side of the writing instrument 1 and the lower side being the front side of the writing instrument 1. FIG. 24, the axial length of the claw portion 152 of the rotating cam 150 is set so that the front end surface of the claw portion 152 is aligned with the front end surface 27 of the inner cylinder 20. In FIG. In this case, the refill 5 in the selected position is not the refill 5 connected to the sliding piece 60 located in the advanced position, ie, the notch 43 , but to the pawl 152 of the rotating cam 150 in the axial direction. The refill 5 is connected to the sliding piece 60 arranged at the opposite position. In this embodiment, when the rear axle 3 is rotated, the sliding piece 60 and the rotating cam 150 do not come into contact with each other, so that the refills 5 that can appear and retract can be switched more smoothly.

In the embodiment described above, the rotation of the rear axle 3 with respect to the front axle 2, that is, the rotation of the rotation selection member, is restricted within a predetermined angle range. That is, as shown in FIG. 2, the front end of the guide projection 53 of the rotating cam 50 can be arranged outside the connecting piece 33a of the spacer 30 in the writing instrument 1 in the non-writing state. In other words, the connecting piece 33a of the spacer 30 and the guide protrusion 53 of the rotating cam 50 do not interfere. In this state, when the rear axle 3 is rotated in one direction with respect to the front axle 2, the rotation restricting piece 33b of the spacer 30 and the guide projection 53 of the rotating cam 50 come into contact with each other, and the rotation of the rear axle 3 is restricted. That is, one circumferential side surface 33c (FIG. 10) of the rotation restricting piece 33b of the spacer 30 and the guide projection 53 of the rotating cam 50 are brought into contact with each other. When the rear shaft 3 is rotated in the other direction with respect to the front shaft 2, the other circumferential side surface 33c of the rotation restricting piece 33b of the spacer 30 and the guide projection 53 of the rotating cam 50 come into contact with each other. Therefore, the rotation of the rotation selection member can be restricted within a predetermined angle range. At this time, for example, from the state shown in FIG. After transitioning to the indicated state, the rear axle 3 is configured so that it cannot be rotated any more. Therefore, in order to arrange the slide piece 60B in the notch 43 of the collar member 40, the rear axle 3 must be rotated 240 degrees in the opposite direction. The rotation of the rotation selection member may be restricted within a predetermined angle range by providing a locking mechanism in the plurality of annular protrusions 37 of the spacer 30 or the plurality of annular grooves 14 of the rear axle 3 or the like.

By restricting the rotatable angle of the rear barrel 3 to a predetermined range (that is, the range of 240 degrees), the refill 5 protruding by the knocking operation at that time can be made identifiable at a glance. That is, in the state shown in FIG. 23A, the clip 28 of the inner cylinder 20 and the mark portion 35 arranged on the display member 12 are aligned as shown in FIG. When the clip 28 and the mark portion 35 are aligned, the refill 5 connected to the slide piece 60A projects by knocking. Since the mark portion 35 moves integrally with the front shaft 2 , the positional relationship between the clip 28 and the mark portion 35 changes according to the rotation direction of the front shaft 2 . Therefore, by looking at the positional relationship between the clip and the mark portion 35, it is possible to determine which refill 5 is in the selected position and which is brought into the writing state by the knocking operation. At this time, the mark portion 35 and the two triangular marks (FIG. 1) may be colored with the color of the ink of the refill 5 to make them easier to distinguish.

The front barrel 2 and the rear barrel 3 are relatively rotatable only when the writing instrument 1 is in a non-writing state. In other words, the rotation selection member can be rotated only when the writing instrument 1 is in the non-writing state. That is, in the writing instrument 1 in the writing state, the rotary cam 50 moves forward as shown in FIG. 22(C). At this time, the rotating cam 50 presses the corresponding sliding piece 60 forward, and the guide protrusion 53 of the rotating cam 50 is inserted into the groove between the rail portions 32 of the spacer 30 . Therefore, even if an attempt is made to rotate the rotation selection member, the rotation is restricted by the engagement between the guide projection 53 of the rotation cam 50 and the rail portion 32, and the rotation cannot be performed. Therefore, when the writing instrument 1 is in the writing state, the front barrel 2 cannot be rotated with respect to the rear barrel 3 . Therefore, an erroneous operation in which the refill 5 is changed by unintentionally rotating the rotation selection member during writing is prevented. On the other hand, when the writing instrument 1 is in a non-writing state, the guide projection 53 of the rotary cam 50 is arranged behind the rail portion 32 and does not engage with the rail portion 32, so that the rotation selection member can be rotated.

Further, even if the writing instrument 1 is changed from the writing state to the non-writing state by the knocking operation, the same refill 5 remains in the selected position unless the rotation selection member is rotated as described with reference to FIG. . Therefore, for example, after writing in black, knocking to a non-writing state, when trying to write in black again, there is no need to select the operation unit corresponding to each refill. Only by knocking the operation part, the black refill 5 can be put into the writing state again. That is, each time, the same refill 5 appears and disappears repeatedly by knocking a single operation portion without searching for a predetermined operation portion in order to protrude the desired refill 5 from a plurality of operation portions. can be done easily. On the other hand, switching the refill 5 to the writing state by the knocking operation can be easily performed by rotating the rotation selection member around the axis as described above.

Further, since each of the sliding pieces 60 is moved in the front-rear direction by rotating the rotation selection member about the axis, a plurality of springs individually bias the refills 5 connected to the sliding piece 60. need not be placed. That is, a single front spring 11 can be used to realize a multi-pin and knock-type writing instrument. As a result, the proportion of the retractable mechanism and the refill selection mechanism to the overall length of the writing instrument 1 in the axial direction can be reduced, the outer diameter of the writing instrument 1 can be made thinner, and the mechanism can be simplified. . Further, by arranging the single front spring 11 outside the spacer 30, that is, near the inner peripheral surface of the barrel 4, it is possible to prevent the refill 5 from coming into contact with the front spring 11 and being damaged. That is, since the rail portion 32 of the spacer 30 covers most of the radially outwardly facing outer peripheral surface of the refill 5 , the refill 5 does not come into contact with the front spring 11 . Furthermore, since a plurality of operating parts are not arranged on the outer peripheral surface of the writing instrument 1, there are few irregularities, and patterns can be printed or decorations can be applied.

An opening is provided on the side surface of the barrel 4 or the barrel 4 is made transparent or translucent so that it can be determined which refill 5 is in the writing state by the knocking operation, that is, which refill 5 is in the selected position. can be Specifically, when an opening is provided in the side surface of the barrel 4, the side surface of the barrel 4 corresponding to each sliding piece 60 is visible from the opening only when the sliding piece 60 is in the advanced position. An opening may be formed in the The slide piece 60 may be colored in the same color as the refill 5 to be inserted.

In the above-described embodiment, the writing instrument 1 has three refills 5, but it may have two or four or more, one of which may be a mechanical pencil or a marking pen instead of a ballpoint pen refill. , a stylus, an eraser, or other types of refills such as friction bodies. Also, the writing instrument 1 is provided with the erasing member 7 for erasing the handwriting of the writing instrument 1 at its rear end, but in addition or instead of this, the erasing member may be provided at a different location on the writing instrument 1. . For example, part of the front barrel 2, for example the front end, may be provided with an erasing member, or the clip may be provided with an erasing member.

In the above-described embodiments, specific examples of protrusions, grooves, cam structures, etc. were shown, but as long as the same effect is achieved, different numbers, different shapes, or independent separate parts may be used.

At least one of the refills 5 in the above-described embodiment may be a refill containing thermochromic ink containing a thermochromic coloring material. In this case, the writing instrument 1 is a thermochromic writing instrument, and the handwriting of the writing instrument 1 can be thermally discolored by frictional heat or the like generated when rubbed by a friction body as an erasing member.

Here, the thermochromic ink maintains a predetermined color (first color) at room temperature (e.g., 25°C) and changes to another color (second color) when heated to a predetermined temperature (e.g., 60°C). , and then returns to the original color (first color) when cooled to a predetermined temperature (eg, −5° C.). In the writing instrument 1 using the thermochromic ink, the second color is made colorless, and the drawing line drawn with the first color (for example, red) is heated to become colorless. . Therefore, the writing surface or the like on which the drawn line is written is rubbed by the frictional body to generate frictional heat, thereby making the drawn line colorless, that is, erasing it. It should be noted that, as a matter of course, the second color may be colored other than colorless.

As the thermochromic microcapsule pigment to be a thermochromic coloring material, those that change color due to heat such as frictional heat, for example, if they have the function of changing from color to colorless, from color to color, from colorless to color, etc. There are no particular restrictions, and various types can be used, including microencapsulated thermochromic compositions containing at least a leuco dye, a developer, and a color change temperature adjuster.

The leuco dye that can be used is not particularly limited as long as it is an electron-donating dye and functions as a color former. Specifically, from the viewpoint of obtaining an ink having excellent color development properties, conventionally known compounds such as triphenylmethane, spiropyran, fluorane, diphenylmethane, rhodamine lactam, indolylphthalide, and leuco auramine It can be used singly (one kind) or in combination of two or more kinds (hereinafter simply referred to as "at least one kind").

Specifically, 6-(dimethylamino)-3,3-bis[4-(dimethylamino)phenyl]-1(3H)-isobenzofuranone, 3,3-bis(p-dimethylaminophenyl)-6 -dimethylaminophthalide, 3-(4-diethylaminophenyl)-3-(1-ethyl-2-methylindol-3-yl)phthalide, 3-(4-diethylamino-2-ethoxyphenyl)-3-(1 -ethyl-2-methylindol-3-yl)-4-azaphthalide, 1,3-dimethyl-6-diethylaminofluorane, 2-chloro-3-methyl-6-dimethylaminofluorane, 3-dibutylamino-6 -methyl-7-anilinofluorane, 3-diethylamino-6-methyl-7-anilinofluorane, 3-diethylamino-6-methyl-7-xyridinofluorane, 2-(2-chloroanilino)-6- dibutylaminofluorane, 3,6-dimethoxyfluorane, 3,6-di-n-butoxyfluorane, 1,2-benz-6-diethylaminofluorane, 1,2-benz-6-dibutylaminofluorane, 1,2-benz-6-ethylisoamylaminofluorane, 2-methyl-6-(Np-tolyl-N-ethylamino)fluorane, 2-(N-phenyl-N--methylamino)-6- (Np-tolyl-N-ethylamino)fluorane, 2-(3′-trifluoromethylanilino)-6-diethylaminofluorane, 3-chloro-6-cyclohexylaminofluorane, 2-methyl-6- Cyclohexylaminofluorane, 3-di(n-butyl)amino-6-methoxy-7-anilinofluorane, 3,6-bis(diphenylamino)fluorane, methyl-3',6'-bisdiphenylaminofluorane , chloro-3′,6′-bisdiphenylaminofluorane, 3-methoxy-4-dodecoxystyrinoquinoline, and the like.

These leuco dyes have a lactone skeleton, a pyridine skeleton, a quinazoline skeleton, a bisquinazoline skeleton, or the like, and develop color by ring-opening of these skeletons (rings).

The developer that can be used is a component that has the ability to develop the color of the leuco dye. are mentioned.

Specifically, o-cresol, tertiary butyl catechol, nonylphenol, n-octylphenol, n-dodecylphenol, n-stearylphenol, p-chlorophenol, p-bromophenol, o-phenylphenol, hexafluorobisphenol, p -n-butyl hydroxybenzoate, n-octyl p-hydroxybenzoate, resorcinol, dodecyl gallate, 2,2-bis(4'-hydroxyphenyl)propane, 4,4-dihydroxydiphenylsulfone, 1,1-bis (4'-hydroxyphenyl)ethane, 2,2-bis(4'-hydroxy-3-methylphenyl)propane, bis(4-hydroxyphenyl)sulfide, 1-phenyl-1,1-bis(4'-hydroxy phenyl)ethane, 1,1-bis(4'-hydroxyphenyl)-3-methylbutane, 1,1-bis(4'-hydroxyphenyl)-2-methylpropane, 1,1-bis(4'-hydroxyphenyl ) n-hexane, 1,1-bis(4′-hydroxyphenyl)n-heptane, 1,1-bis(4′-hydroxyphenyl)n-octane, 1,1-bis(4′-hydroxyphenyl)n -nonane, 1,1-bis(4′-hydroxyphenyl)n-decane, 1,1-bis(4′-hydroxyphenyl)n-dodecane, 2,2-bis(4′-hydroxyphenyl)butane, 2 , 2-bis(4′-hydroxyphenyl)ethyl propionate, 2,2-bis(4′-hydroxyphenyl)-4-methylpentane, 2,2-bis(4′-hydroxyphenyl)hexafluoropropane, At least one of 2,2-bis(4′-hydroxyphenyl)n-heptane, 2,2-bis(4′-hydroxyphenyl)n-nonane and the like can be mentioned.

The amount of the developer to be used may be arbitrarily selected according to the desired color density, and is not particularly limited. It is preferable to select within the range of about 100 parts by mass.

The discoloration temperature control agent that can be used is a substance that controls the discoloration temperature in the coloration of the leuco dye and developer. Conventionally known discoloration temperature regulators can be used. Specific examples include alcohols, esters, ketones, ethers, acid amides, azomethines, fatty acids, hydrocarbons and the like.

More specifically, bis(4-hydroxyphenyl)phenylmethane dicaprylate (C ₇ H ₁₅ ), bis(4-hydroxyphenyl)phenylmethane dilaurate (C ₁₁ H ₂₃ ), bis(4-hydroxyphenyl)phenyl methane dimyristate (C ₁₃ H ₂₇ ), bis(4-hydroxyphenyl)phenylethane dimyristate (C ₁₃ H ₂₇ ), bis(4-hydroxyphenyl)phenylmethane dipalmitate (C ₁₅ H ₃₀ ), bis At least one of (4-hydroxyphenyl)phenylmethane dibehenate (C ₂₁ H ₄₃ ), bis(4-hydroxyphenyl)phenylethylhexylidene dimyristate (C ₁₃ H ₂₇ ) and the like can be mentioned.

The amount of the discoloration temperature adjusting agent to be used may be appropriately selected depending on the desired hysteresis width and color density at the time of color development, and is not particularly limited, but is usually per 1 part by mass of the leuco dye. , about 1 to 100 parts by mass.

The thermochromic microcapsule pigment is obtained by microencapsulating a thermochromic composition containing at least the leuco dye, a developer, and a color change temperature adjuster so that the average particle size is 0.1 to 5 μm. can be manufactured. Microencapsulation methods include, for example, an interfacial polymerization method, an interfacial polycondensation method, an in situ polymerization method, an in-liquid curing coating method, a phase separation method from an aqueous solution, a phase separation method from an organic solvent, a melting dispersion cooling method, an air A suspension coating method, a spray lining method, and the like can be mentioned, and can be appropriately selected according to the application.

For example, in the phase separation method from an aqueous solution, a leuco dye, a developer, and a discoloration temperature adjusting agent are heated and melted, then added to an emulsifier solution, heated and stirred to disperse them in the form of oil droplets, and then, as a capsule film agent, Using a resin raw material, for example, an amino resin solution, an isocyanate resin solution, etc. are gradually added, followed by reaction, and after preparation, the dispersion is filtered to produce the desired thermochromic microcapsule pigment. be able to.

The contents of these leuco dye, color developer, and color change temperature adjuster vary depending on the type of leuco dye, color developer, and color change temperature adjuster used, the microencapsulation method, and the like. The weight ratio of the developer is 0.1 to 100 and the discoloration temperature regulator is 1 to 100. The mass ratio of the capsule film agent to the capsule content is 0.1 to 1.

The thermochromic microcapsule pigment can be obtained by appropriately combining the types and amounts of the leuco dye, developer, and color change temperature adjusting agent, so that the color development temperature of each color (e.g., color development at -20 ° C. or higher), color disappearance temperature (for example, the color is erased at 60° C. or higher) can be set to a suitable temperature, and it is preferable that the color is changed from color to colorless by heat such as frictional heat.

In the thermochromic microcapsule pigment, the wall film is preferably made of a urethane resin, a urea/urethane resin, an epoxy resin, or an amino resin in order to further improve drawing density, storage stability, and writability. Examples of urethane resins include compounds of isocyanate and polyol. Epoxy resins include, for example, compounds of epoxy resins and amines. Amino resins include melamine resins, urea resins, benzoguanamine resins, and the like. The thickness of the wall film of the microcapsule colorant is appropriately determined according to the required wall film strength and drawing density.

The average particle size of the thermochromic microcapsule pigment is good for colorability, color development, easy decolorization, stability, fluidity in ink, and suppresses adverse effects on writing, and photodiscoloration, which will be described later. From the viewpoint of compatibility with the microcapsule pigment, it is preferably 0.1 to 5 μm, more preferably 0.3 to 3 μm. The "average particle diameter" defined here is the value obtained by measuring the average particle diameter (50% diameter) with a particle size analyzer [Microtrac HRA9320-X100 (manufactured by Nikkiso Co., Ltd.)] (refractive index 1.8). is.

If the average particle size is less than 0.2 μm, a sufficient drawn line density cannot be obtained. Backing tends to occur, which is not preferable. Furthermore, the 90% diameter is 8 μm or less, preferably 6 μm or less. When particles having a large diameter are present in a certain proportion or more, the above-mentioned influence tends to become more pronounced. In addition, the microcapsule pigment having the above average particle size range (0.1 to 5 μm) varies depending on the microencapsulation method. It can be prepared by appropriately combining conditions.

The specific gravity of the thermochromic microcapsule pigment ranges from 0.9 to 1.3, preferably from 1.0 to 1.2. If the specific gravity is outside this range, the dispersion stability of the microcapsule pigment tends to decrease. In addition, microcapsule pigments having a specific gravity exceeding 1.3 tend to cause ink back due to vibration.

In the water-based ink composition for writing instruments, in addition to the thermochromic microcapsule pigment, the balance is water as a solvent (tap water, purified water, distilled water, ion-exchanged water, pure water, etc.), and for each writing instrument (ballpoint pen (for marking pens, etc.), water-soluble organic solvents, thickeners, lubricants, rust inhibitors, antiseptics, antibacterial agents, etc. can.

Examples of water-soluble organic solvents that can be used include glycols such as ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, polyethylene glycol, 3-butylene glycol, thiodiethylene glycol, and glycerin, ethylene glycol monomethyl ether, and diethylene glycol monomethyl. Ethers can be used singly or in combination.

Among these, glycerin is preferably used for the purpose of suppressing ink solidification in the writing portion due to ink back, and the amount added is preferably 1 to 10% by mass based on the total amount of ink. Although the mechanism of action of glycerin is unknown, it is presumed that it has the effect of reducing the cohesive force between pigments and ink components in a dry state.

As a thickener that can be used, for example, at least one selected from the group consisting of synthetic polymers, cellulose and polysaccharides is preferable. Specifically, gum arabic, tragacanth gum, guar gum, locust bean gum, alginic acid, carrageenan, gelatin, xanthan gum, welan gum, succinoglycan, diutan gum, dextran, methylcellulose, ethylcellulose, hydroxyethylcellulose, carboxymethylcellulose, starch glycolic acid and its salt, propylene glycol alginate, polyvinyl alcohol, polyvinylpyrrolidone, polyvinyl methyl ether, polyacrylic acid and its salt, carboxyvinyl polymer, polyethylene oxide, copolymer of vinyl acetate and polyvinylpyrrolidone, crosslinked acrylic acid polymer and Examples thereof include salts thereof, non-crosslinked acrylic acid polymers and salts thereof, styrene-acrylic acid copolymers and salts thereof.

Among these, it is preferable to use polysaccharides. Due to their rheological properties, polysaccharides tend to be less susceptible to fluidity due to vibration, and problems such as poor writing due to ink back are less likely to occur. Xanthan gum is particularly preferred because it has an excellent balance with other properties required for writing inks.

Examples of lubricants include fatty acid esters of polyhydric alcohols, higher fatty acid esters of sugar, polyoxyalkylene higher fatty acid esters, alkyl phosphates, alkyl sulfonates of higher fatty acid amides, and alkyl allyl sulfones, which are also used as surface treatment agents for pigments. Acid salts, derivatives of polyalkylene glycol, fluorosurfactants, polyether-modified silicones, and the like. Examples of rust preventives include benzotriazole, tolyltriazole, dicyclohexylammonium nitrite, saponins and the like. Examples of antiseptics or antibacterial agents include phenol, sodium omadine, sodium benzoate, and benzimidazole compounds.

Conventionally known methods can be employed for producing this water-based ink composition for writing instruments. It is obtained by blending and stirring and mixing with a stirrer such as a homomixer or a disper. Further, if necessary, coarse particles in the ink composition may be removed by filtration or centrifugation.

The viscosity of the water-based ink composition for writing instruments is preferably 500 to 2000 mPa·s at 25° C. and a shear rate of 3.83/s, and preferably 20 to 100 mPa·s at a shear rate of 383/s. By setting the viscosity within the above range, it is possible to obtain an ink having excellent writing properties and stability over time. Further, S = αD ⁿ (where 1>n>0) (S is shear stress (dyn/cm ² ), D is shear rate (s ⁻¹ ), and α is non-Newtonian viscosity coefficient). The desired non-Newtonian viscosity index n is preferably 0.2 to 0.6. By setting the non-Newtonian viscosity index n to the above range in addition to the above viscosity range, it is possible to appropriately set the fluidity of the ink against vibration, and to prevent the occurrence of ink back.

The surface tension of the water-based ink composition for writing instruments is preferably 25-45 mN/m, more preferably 30-40 mN/m. Within this range, the wettability balance between the inside of the pen tip and the ink becomes appropriate, and it is possible to prevent the occurrence of ink back.

An ink follower may be positioned immediately behind the ink in the refill. The material constituting the follower can be composed of at least a non-volatile or hardly volatile organic solvent and a thickening agent. The non-volatile or hardly volatile organic solvent used in the ink follower is used as the base oil of the ink follower, and for example, liquid paraffin is used. Mineral oil and chemically synthesized oil are used as liquid paraffin, and polybutene, polyα-olefin, ethylene α-olefin oligomer and the like can be used as chemically synthesized oil.

Specific mineral oils that can be used include, for example, commercially available Diana Process Oils NS-100, PW-32, PW-90, NR-68, and AH-58 (manufactured by Idemitsu Kosan Co., Ltd.).

Specific polybutenes that can be used include, for example, commercially available Nissan polybutene 200N, polybutene 30N, polybutene 10N, polybutene 5N, polybutene 3N, polybutene 015N, polybutene 06N, polybutene 0N (manufactured by NOF CORPORATION), and polybutene. HV-15 (manufactured by Nippon Petrochemical Co., Ltd.), 35R (manufactured by Idemitsu Kosan Co., Ltd.), and the like.

Specific polyα-olefins that can be used include, for example, commercially available barrel process oils P-26, P-46, P-56, P-150, P-350, P-1500, P-2200, (P-10000, P-37500) (manufactured by Matsumura Oil Co., Ltd.) and the like.

Specific ethylene α-olefin oligomers that can be used include, for example, commercially available Lucant HC-10, HC-20, HC-100, HC-150, (HC-600, HC-2000) (the above, Mitsui chemical company) and the like.

These nonvolatile or hardly volatile organic solvents can be used singly or in combination of two or more.

Examples of thickeners used in the ink follower include calcium salts of phosphoric acid esters, fine silica particles, block copolymers of polystyrene-polyethylene/butylene rubber-polystyrene, block copolymers of polystyrene-polyethylene/propylene rubber-polystyrene, and hydrogenated styrene. -butadiene rubber, styrene-ethylenebutylene-olefin crystal block copolymer, olefin crystal-ethylenebutylene-olefin crystal block copolymer, acetoalkoxyaluminum dialkylate, and the like, and one or more of these may be used.

Preferable commercial products of calcium salts of phosphoric acid esters that can be used include Crodax DP-301LA (manufactured by Croda Japan). Fine particle silica that can be used includes hydrophilic fine particle silica and hydrophobic fine particle silica, and preferred commercial products of hydrophilic silica include AEROSIL-300 and AEROSIL-380 (manufactured by Nippon Aerosil Co., Ltd.). Preferred commercial products of hydrophobic silica include AEROSIL-974D and AEROSIL-972 (manufactured by Nippon Aerosil Co., Ltd.).

Preferred commercial products of block copolymers of polystyrene-polyethylene/butylene rubber-polystyrene include Kraton GFG-1901X, Kraton GG-1650 (manufactured by Shell Japan Co., Ltd.), Septon 8007, Septon 8004 (manufactured by Kuraray Co., Ltd.), and the like. is mentioned. Preferred commercial products of block copolymers of polystyrene-polyethylene/propylene rubber-polystyrene include Kraton GG-1730 (manufactured by Shell Japan), Septon 2006 and Septon 2063 (manufactured by Kuraray Co., Ltd.).

Preferable commercially available hydrogenated styrene-butadiene rubbers include DYNARON1320P, DYNARON1321P (manufactured by JSR Corporation), Tuftec H1041 and Tuftec H1141 (manufactured by Asahi Chemical Industry Co., Ltd.).

Preferable commercially available styrene-ethylenebutylene-olefin crystal block copolymers include DYNARON4600P (manufactured by JSR Corporation), and preferable commercially available olefin crystal-ethylenebutylene-olefin crystal block copolymers include DYNARON6200P and DYNARON6201B ( manufactured by JSR) and the like.

Plenact AL-M (manufactured by Ajinomoto Fine-Techno Co., Ltd.) and the like can be mentioned as preferred commercial products of acetoalkoxyaluminum dialkylate.

Among these thickeners, thermoplastic olefin-based elastomers such as block copolymers of styrene-ethylenebutylene-olefin crystals and block copolymers of olefin crystals-ethylenebutylene-olefin crystals are preferred from the viewpoint of further exerting the effects of the present invention. Use is preferred.

Furthermore, in order to obtain an ink follower that prevents the occurrence of ink back, the average value of the tan δ values measured for each frequency while exponentially increasing in the frequency range of 1 to 63 rad/s should be 1.0 or more. is preferred, and 1.7 to 3.4 is more preferred.

Here, tan δ is a value that means loss elastic modulus/storage elastic modulus, and conventionally, the average value of tan δ values measured for each frequency while increasing exponentially in the frequency range “1 to 63 rad/s” is 1.0 or less is preferred. In the present invention, by setting the average value of the tan δ values measured for each frequency at 1 to 63 rad/s to 1.0 or more, it is possible to absorb vibrations and prevent the occurrence of ink back.

Thermosetting rubbers such as silicone rubber, nitrile rubber, ethylene propylene rubber and ethylene propylene diene rubber, thermoplastic elastomers such as styrene elastomers, olefin elastomers, polyester elastomers and urethane elastomers are used as materials for forming the friction body. A rubber elastic material, a mixture of two or more rubber elastic materials, and a mixture of a rubber elastic material and a synthetic resin can be used. A friction body is formed so that the amount of Taber wear on wear wheel CS-17 of a Taber abrasion tester is less than 25 mg under an environment of 8 N and 1000 rpm.

Also, phenyl alkylsulfonate and cyclohexanedicarboxylate may be added to the material of the friction body. By including phenyl alkylsulfonate and cyclohexanedicarboxylate in the friction body, handwriting can be erased without damaging the paper surface and without blurring printed characters. Further, the friction body preferably has a durometer A hardness of 60 or more as defined in JIS K6203. Thereby, a predetermined hardness can be secured, and a more stable rubbing operation becomes possible. In addition, the friction body can be applied as a touch pen or a stylus pen, and may be provided with conductivity.

Moreover, the friction body is preferably colored with a color having a lower lightness value than the color of the thermochromic ink contained in the writing instrument 1 . That is, when the thermochromic ink of the writing instrument 1 is transferred to the surface of the friction body without being discolored when the friction body is used, the transfer of the thermochromic ink can be made inconspicuous. In particular, by making the color of the friction body black or having a brightness value of 2.5 or less, dirt on the surface caused by use of the friction body can be made inconspicuous.

The brightness value uses the Munsell color system using a measuring device such as a general-purpose color difference meter (TC-8600A, manufactured by Tokyo Denshoku Co., Ltd.), and the brightness value of the friction body is measured on the surface. The lightness value is written on paper (old JIS P3201; fine paper made from 100% chemical pulp, basis weight range 40-157 g/m2, whiteness 75.0% or more) at a writing speed of 4.5 m/min. It is obtained by measuring the ink on a drawn line with a pitch interval of 0.1 mm.

Also, at least one of the plurality of refills 5 in the above-described embodiment is a refill containing mechanical pencil lead, pencil lead, or eraser erasable ink, and at least one of the remaining refills 5 contains thermochromic ink. It can also be used as a refill. In this case, by using a plastic eraser or an eraser as the erasing member 7, it is possible to erase handwriting with a mechanical pencil lead, pencil lead, or eraser-erasable ink. In addition, a plastic eraser or an eraser can be used to rub the handwriting of the thermochromic ink, and the handwriting can be thermally discolored by generating frictional heat.

Therefore, the plastic eraser or eraser can be used as an erasing member for different types of writing, i.e. a mechanical pencil lead, a pencil lead or an erasing member for erasing writing with erasable ink, and an erasing member for erasing writing with thermochromic ink. It can be used as a friction body for thermally discoloring (erasing) handwriting. It should be noted that the term “erasable handwriting with a plastic eraser or eraser” as used herein means that the handwriting can be erased by rubbing the handwriting with a plastic eraser or eraser without staining the paper surface, etc. around the handwriting. Say things.

The sharp lead or pencil lead is, for example, an average thickness of 0 in which at least one fine particle (excluding glass powder) selected from inorganic pigments, organic pigments, and dyes is dispersed or included as a compounding composition before firing. .1 to 2 μm, an aspect ratio of 5 to 150, and a flatness of 200 nm or less in the form of flakes or granules with an average particle diameter of 0.1 to 50 μm and a sphericity of 0.1 to 50 μm. It is preferable to contain 3 to 80% by weight of the glass powder with respect to the total weight of the pencil lead.

The eraser erasable ink has an average particle size of 2 to 20 μm, a non-thermoplastic colored resin particle in an amount of 5 to 30% by weight based on the total amount of the ink composition, and a glass transition point of less than 0°C. It preferably contains at least non-colored particles. The "average particle size" defined here is the average particle size (50% diameter) measured with a particle size analyzer [Microtrac HRA9320-X100 (manufactured by Nikkiso Co., Ltd.)] as described above (refractive index 1 .8).

In this case, the friction body is composed of a shell having a relatively high glass transition temperature (Tg) and a core having a glass transition temperature (Tg) relatively lower than that of the shell, in addition to the friction body described above. It contains an acrylic thermoplastic resin powder, a plasticizer and an inorganic powder having a diameter of 20 to 80 μm, and a thermoplastic resin, the thermoplastic resin being a polyvinyl chloride resin or a copolymer thereof, and the inorganic powder being calcium carbonate and /or Magnesium carbonate is preferred because both the thermochromic ink and the erasable ink can be rubbed together. The term "glass transition temperature (Tg)" refers to the boundary temperature at which the amorphous portion of the acrylic resin powder becomes more mobile and becomes rubbery.

FIG. 25 is a perspective view of writing instrument 201 according to another embodiment of the present invention. The writing instrument 201 differs from the writing instrument 1 according to the above-described embodiment in the shape of the rear barrel and the spacer, and the other members are the same or substantially the same, so only the differences will be described.

FIG. 26 is a longitudinal sectional view of the rear axle 203. FIG. When the writing instrument 1 is assembled, the rear barrel 203 is arranged such that the upper side thereof faces the rear side of the writing instrument 201 in FIG. 26 . Two substantially I-shaped elongated protrusions 213 are provided on the inner peripheral surface of the rear axle 203 as a locking portion. The two elongated projections 213 are spaced apart by 120 degrees around the central axis. The elongated protrusion 213 may be provided as a separate member instead of being provided on the inner peripheral surface of the rear axle 203, for example. The position of the front end of the elongated projection 213 on the rear barrel 203 is the same as the position of the front end of the T-shaped projection 13 on the corresponding rear barrel 3 of the writing instrument 1 . However, the position of the rear end of the elongated projection 213 on the rear barrel 203 is positioned forward of the position of the rear end of the T-shaped projection 13 on the rear barrel 3 of the writing instrument 1 . That is, the length of the elongated projection 213 in the axial direction is shorter than the length of the T-shaped projection 13 in the axial direction.

FIG. 27 is a perspective view of spacer 230. As shown in FIG. The spacer 230 is arranged such that the upper side thereof is the rear side of the writing instrument 201 in FIG. 27 when the writing instrument 201 is assembled. The spacer 230 has a connecting portion 233 formed to connect the rear ends of the three rail portions 32 . The connecting portion 233 has three connecting pieces 33 a each having an outer shape slightly smaller than the outer diameters of the three rail portions 32 . That is, the spacer 230 does not have the rotation restricting piece 33b of the spacer 30 of the writing instrument 1. As shown in FIG. Therefore, in the writing instrument 201 , the rear barrel 203 is freely rotatable with respect to the front barrel 2 . That is, the rotation of the rear axle 203 about the axis is not restricted by the contact between the connecting portion 233 of the spacer 230 and the guide projection 53 of the rotating cam 50 . A projecting mark portion 235 extending forward is formed on the front end surface of the flange portion 34 . The mark portion 235 protrudes radially outward from the mark portion 35 of the writing instrument 1 . Therefore, in the writing instrument 201, the mark portion 235 protrudes from the outer surface of the barrel 4 to such an extent that it can be clearly identified by touching it with a finger (FIG. 25). This makes it possible to easily identify the joint between the front axle 2 and the rear axle 3 .

28A and 28B are schematic diagrams for explaining the operation of the refill at the time of the knocking operation. The operation of refilling the writing instrument 201 when the knocking operation is performed is basically the same as the operation of refilling the writing instrument 1 when the knocking operation is performed as described above with reference to FIG. 22 . However, unlike the T-shaped protrusion 13 on the writing instrument 1, the elongated protrusion 213 on the writing instrument 201 is not associated with the refill action during the knocking operation, and is therefore not shown in FIG. In the writing instrument 1 in the writing state, as described with reference to FIG. advance was restricted. However, in the writing instrument 201 , the rear end of the elongated projection 213 is located forward of the rear end of the T-shaped projection 13 of the writing instrument 1 , so that the sliding piece 60 is engaged with the elongated projection 213 . never stop.

Here, in the writing instrument 1, in both the non-writing state (FIG. 22(A)) and the writing state (FIG. 22(C)), the sliding piece 60 is locked or substantially locked to the T-shaped projection 13. is doing. Therefore, if the writing instrument 1 is accidentally dropped with the front end of the writing instrument 1 facing downward, a strong axial impact is applied to the sliding piece 60 and the refill 5 connected to the sliding piece 60 . At this time, since the slide piece 60 is engaged with the T-shaped projection 13 , the refill 5 receives an inertial force in the direction away from the slide piece 60 .

On the other hand, in the writing instrument 201, the sliding piece 60 does not engage with the elongated projection 213. Therefore, even if the writing instrument 201 is dropped with the front end facing downward, the refill 5 will move forward together with the sliding piece 60. Move to Therefore, there is no possibility that the refill 5 will come off the slide piece 60 . In other words, in the writing state of the writing instrument 201, since the sliding piece 60 and the first cam surface 44 are separated from each other, only the sliding piece 60 is not restricted in its forward movement, and the refill 5 can move forward. There is no danger of deviating from 60. The forward movement of the refill 5 and the slide piece 60 is restricted by the contact of the writing portion 5a of the refill 5 with the tapered portion at the front end of the front barrel 2. As shown in FIG.

1 writing instrument 4 barrel 5 refill 7 erasing member 10 rear spring 11 front spring 13 T-shaped projection 20 inner cylinder 30 spacer 40 collar member 50 rotating cam 60 sliding piece 70 operating member 80 rotor 90 brake rod 100 knock ring

Claims (7)

A knock-type writing instrument comprising a barrel and an operating portion, and capable of switching between a writing state and a non-writing state by performing a knocking operation to press the operating portion forward,
It further comprises a brake member that can move in the longitudinal direction within the shaft cylinder by gravity, a rotating member that moves together with the operating portion and can rotate about the central axis, and an engaging portion that can be engaged with the rotating member. death,
When the front end of the shaft cylinder is directed upward, the brake member moves rearward, the rotation of the rotating member is restricted, and the rotating member is locked with the locking portion, thereby moving the operating portion forward. A retractable writing instrument characterized by being prevented from moving. 2. A retractable writing instrument according to claim 1, wherein said rotating member is a cylindrical member. 2. A protrusion is provided on the inner surface of the rotating member, and the brake member inserted into the rotating member engages with the protrusion, thereby restricting the rotation of the rotating member. 2. The knock-type writing instrument according to 2. The rotating member has a first inclined surface that is circumferentially inclined with respect to a plane perpendicular to the front-rear direction, and the locking portion has a second inclined surface that is circumferentially inclined with respect to a plane perpendicular to the front-rear direction. having a slope,
4. A forward movement of the operating portion is prevented by contacting a first inclined surface of the rotating member whose rotation is restricted with a second inclined surface of the engaging portion. The retractable writing instrument according to any one of . 5. The retractable writing instrument according to claim 4, wherein the first slope or the second slope is greater than 45 degrees with respect to the axial direction of the retractable writing instrument. a writing device comprising a plurality of writing bodies, a sliding member to which each of the writing bodies is connected, and a first cam surface disposed in front of the sliding member and cooperating with each of the sliding members; The knock-type writing instrument according to any one of claims 1 to 5, wherein in a state, at least one of said sliding members and said first cam surface are separated from each other. The retractable writing instrument according to any one of claims 1 to 6, wherein all or part of the operation section is an erasing section capable of erasing handwriting of the retractable writing instrument.

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