JP6971483B2 - Pencil sharpener - Google Patents

Description

The present invention relates to a pencil sharpener used on a tabletop in which the sharpening angle of a pencil can be selected.

Some pencil sharpeners that are generally used on the table have a function that allows you to select the sharpened state of the pencil lead. In such a pencil sharpener, a member that contacts the tip of the pencil lead and determines the position of the lead is placed inside the rotary blade of the pencil sharpener so that the position can be changed with respect to the rotary blade of the pencil. The insertion position is set and the sharpened state of the core is set.

However, when sharpening a pencil, it is desirable to be able to select the sharpening angle of the pencil shaft in addition to the sharpened state of the core.

That is, the pencil lead used by children in the lower grades of elementary school is soft (for example, 2B-4B) and is used with strong writing pressure. Therefore, in order to prevent the core from breaking, it is desirable to set the sharpening angle (for example, 26 degrees) larger than the sharpening angle (for example, 20 degrees) of a commonly used pencil (for example, hardness is H, HB, B, etc.).

Further, since the strength of the core of the colored pencil is weaker than that of a general pencil, it is desirable to set a large sharpening angle (for example, 35 degrees) as well.

For this reason, conventionally, as a pencil sharpener used on a tabletop, a pencil sharpener that can set the sharpening angle to the optimum angle depending on the application and the type of pencil has been desired.

As a pencil sharpener that can change the sharpening angle of a pencil, Patent Document 1 describes a pencil sharpener that can change the inclination of a cutting roll by supporting one end of the shaft of the cutting roll with a wedge that can be freely moved in and out. ing.

Jikken Akira 38-23952 Gazette

However, although the pencil sharpener described in Patent Document 1 can change the sharpening angle of the pencil shaft, the set sharpening angle is difficult to understand, and it is difficult to set the sharpening angle optimal for the type and hardness of the pencil. Is.

The present invention has been made in view of the above-mentioned problems, and provides a pencil sharpener capable of easily and surely designating a sharpening angle of a pencil shaft to an optimum angle according to the hardness of a pencil lead. The purpose is.

The invention according to claim 1, which solves the above-mentioned problems, is arranged with a holding portion into which a pencil is inserted along an insertion axis and an inclination angle set with respect to the insertion axis, and has a handle. In a pencil sharpener having a rotary blade portion that is rotationally driven with respect to the tip portion of the pencil by rotation and sharpening the tip portion at a set sharpening angle, the rotary blade portion is set to the holding portion. A blade holding member that holds the rotary blade portion at a predetermined tilt angle so as to be tiltable about the tilting axis, an elastic member that applies an urging force to the rotary blade portion in a direction in which the tilt angle increases, and the rotation. A blade angle holding member that holds the tilt angle of the blade at a predetermined angle, and an angle determining member that can determine the tilt angle of the rotary blade based on a cutting angle that matches the hardness of the pencil lead. The blade angle holding member comprises an angle holding inner surface portion formed by a rotating surface along the insertion axis and having different radii around the insertion axis, and the blade holding member comprises the blade angle. A rolling member that rolls in contact with the angle holding inner surface portion of the holding member is provided, the angle determining member is configured to rotate around the insertion shaft, and the blade angle holding member is inserted into the insertion shaft. It is characterized by moving back and forth along the direction of.

Here, the "hardness of the core" of the pencil includes the hardness (H, HB, B, etc.) defined by the JIS standard and the hardness of the core of a colored pencil that is softer than a normal pencil.

According to the present invention, when sharpening a pencil, the rotary blade portion is held so as to be able to tilt around the tilt axis, and the rotary blade portion is an elastic member and is provided with an urging force in a direction in which the tilt angle increases. ing. Further, the blade holding member comes into contact with the blade angle holding member, and the tilt angle of the rotary blade is held at a predetermined angle. Then, the angle determining member determines the inclination angle of the rotary blade portion based on the cutting angle suitable for the hardness of the pencil lead.

Therefore, the angle of the rotary blade with respect to the insertion axis can be selected and set simply by operating the blade angle holding member, and the optimum angle according to the type and application of the pencil can be easily and reliably specified. Can be scraped.

According to the present invention, the angle of the blade holding member is determined by the radius of the angle holding inner surface portion on which the rolling member of the blade angle holding member rolls. Since this angle holding inner surface portion has a rotating surface having a different radius with the insertion axis as an axis, the blade holding is performed by moving the blade angle holding member back and forth along the insertion axis with the angle determining member and setting the arrangement position. The rolling member rolling radius of the member, that is, the tilt angle of the blade holding member can be set. Therefore, by rotating the angle determining member, it is possible to easily and surely specify the optimum angle according to the type and application of the pencil and sharpen the pencil.

Similarly, according to the second aspect of the present invention, in the pencil sharpener according to the first aspect, the blade angle holding member is formed in a cylindrical shape, and the angle holding inner surface portion has an inner circumference having a different radius. A plurality of short cylinder inner surface portions arranged at predetermined intervals in the insertion axis direction, and a conical inner surface portion having a different radius formed between the short cylinder inner surface portions and connected to the short cylinder inner surface portion. It is characterized by being formed from.

According to the present invention, since the angle holding inner surface portion includes a plurality of short cylinder inner surface portions and a conical inner surface portion connected to these, the blade angle holding member is moved back and forth along the insertion axis by the angle determining member. By selecting the inner surface portion of the short cylinder on which the rolling member rolls, the revolution radius of the rolling member of the blade holding member, that is, the inclination angle of the blade holding member can be set. Further, when the rolling member moves back and forth from one short cylinder inner surface portion to another short cylinder inner surface portion, the rolling member moves while rolling on the conical inner surface portion connecting them. Therefore, the movement in the front-rear direction when the inclination angle is changed becomes smooth.

Therefore, by rotating the angle determining member, it is possible to easily specify the tilt angle suitable for the hardness of the pencil step by step, and further, the rolling member is moved by operating the angle determining member at the time of selecting the step. The operation can be performed smoothly.

Similarly, according to the third aspect of the present invention, in the pencil sharpener according to the first aspect, the radius of the inner surface of the angle holding inner surface portion of the blade angle holding member changes linearly along the insertion axis. It is characterized by having a conical inner surface portion.

According to the present invention, since the angle holding inner surface portion includes a conical inner surface portion in which the radius of the inner surface changes linearly along the insertion axis, the blade angle holding member is linearly moved along the insertion axis by the angle determining member. By selecting the position, that is, the radius of the conical inner surface portion on which the rolling member rolls, the revolving radius of the rolling member of the blade holding member, that is, the inclination angle of the blade holding member can be set.

Therefore, by rotating the angle determining member, it is possible to continuously and easily specify the inclination angle suitable for the hardness of the pencil.

Similarly, the invention according to claim 4 is the pencil sharpener according to any one of claims 1 to 3, wherein the blade angle holding member is provided with a protrusion on an outer peripheral surface portion, and the angle is determined. The member is formed in a cylindrical shape having a diameter larger than that of the blade angle holding member, is formed so as to be rotatable and rotatable from the outside of the pencil sharpener, covers the outside of the blade angle holding member, and has the blade angle. It is characterized by having a cam groove formed so as to move the blade angle holding member back and forth when the protrusion of the holding member is inserted and the angle determining member is rotated.

According to the present invention, the angle determining member is formed in a cylindrical shape having a larger diameter than the blade angle holding member and can be rotationally driven from the outside of the pencil sharpener, covers the outside of the blade angle holding member, and has a blade portion. It is provided with a cam groove formed so as to move the blade angle holding member back and forth when the protrusion of the angle holding member is inserted and the angle determining member is rotated. Therefore, by rotating the angle determining member, the protrusion inserted into the cam groove moves in the front-rear direction, and the blade angle holding member moves in the front-rear direction accordingly.

Then, as the blade angle holding member moves, the angle of the blade holding member changes. Therefore, the sharpening angle of the pencil can be changed by a simple and easy-to-understand operation of rotating the angle determining member.

Similarly, according to claim 5, in the pencil sharpener according to claim 1, the angle determining member includes a rotary dial arranged on the side of the pencil sharpener into which the pencil is inserted, and the rotary dial. Is characterized in that a pencil image representing the shape of the sharpener of the selected pencil is displayed as an icon.

According to the present invention, the angle determining member for determining the sharpening angle of the pencil includes a rotary dial arranged on the side of the pencil sharpener into which the pencil is inserted. Then, an icon indicating the shape of the sharpening angle of the selected pencil is displayed on this rotary dial. Therefore, by checking the displayed icon and operating the rotary dial, the angle determining member is rotated and the blade angle holding member operates. Thereby, the angle of the blade holding member is determined.

Therefore, the sharpening angle of the pencil can be changed and set by a simple and easy-to-understand operation of rotating the rotary dial while checking the icon displaying the sharpening angle.

Similarly, the invention according to claim 6 is characterized in that, in the pencil sharpener according to claim 4, a knob member protruding from the upper surface of the pencil sharpener and rotationally driving the angle determining member is provided.

According to the present invention, the angle determining member includes a knob member that rotationally drives the angle determining member.
Therefore, by rotating the angle determining member with the knob, the protrusion inserted in the cam groove moves in the front-rear direction, and the blade angle holding member moves in the front-rear direction accordingly. Then, as the blade angle holding member moves, the angle of the blade holding member changes.

Therefore, the sharpening angle of the pencil can be changed by a simple and easy-to-understand operation of rotating the knob.

Similarly, the invention according to claim 7 is arranged with a holding portion into which a pencil is inserted along an insertion axis and an inclination angle set with respect to the insertion axis, and is described by rotation of a handle. In a pencil sharpener that has a rotary blade portion that is rotationally driven with respect to the tip portion of a pencil and that sharpens the tip portion at a set sharpening angle, the tilting shaft that has the rotary blade portion set as the holding portion. A blade holding member that holds the rotary blade portion at a predetermined tilt angle so as to be tiltable about the center, an elastic member that applies an urging force to the rotary blade portion in a direction in which the tilt angle increases, and a rotary blade portion. It is provided with a blade angle holding member that holds the tilt angle at a predetermined angle, and an angle determining member that can determine the tilt angle of the rotary blade based on a cutting angle that matches the hardness of the pencil lead. The angle determining member is provided with a fulcrum arranged on the main body of the pencil sharpener on one end side, the other end is a force point, and the blade angle holding member is straight along the insertion axis between the force point and the fulcrum. It is characterized by being provided with a lever member to be operated.

According to the present invention, the angle determining member includes a lever member, and the lever member has a fulcrum arranged on the main body of the pencil sharpener on one end side and a fulcrum on the other end, and a blade portion between the fulcrum and the fulcrum. The angle holding member is operated linearly along the insertion axis.

Therefore, by operating the lever member, the protrusion inserted into the cam groove moves in the front-rear direction, and the blade angle holding member moves in the front-rear direction accordingly. Then, as the blade angle holding member moves, the angle of the blade holding member determined by the blade angle holding member changes. Therefore, the sharpening angle of the pencil can be changed by a simple and easy-to-understand operation of rotating the lever member.

Similarly, the invention according to claim 8 is arranged with a holding portion into which a pencil is inserted along an insertion axis and an inclination angle set with respect to the insertion axis, and is described by rotation of a handle. In a pencil sharpener that has a rotary blade portion that is rotationally driven with respect to the tip portion of a pencil and that sharpens the tip portion at a set sharpening angle, the tilting shaft that has the rotary blade portion set as the holding portion. A blade holding member that holds the rotary blade portion at a predetermined tilt angle so as to be tiltable about the center, an elastic member that applies an urging force to the rotary blade portion in a direction in which the tilt angle increases, and a rotary blade portion. It is provided with a blade angle holding member that holds the tilt angle at a predetermined angle, and an angle determining member that can determine the tilt angle of the rotary blade based on a cutting angle that matches the hardness of the pencil lead. The blade angle holding member is a plate formed so as to come into contact with the side of the blade holding member opposite to the insertion side of the pencil and change the inclination angle between the rotary blade and the insertion shaft. A cam is provided, and the angle determining member is arranged on a handle shaft portion of the pencil sharpener, and is characterized by being a selection dial for rotationally driving the plate cam.

According to the present invention, the blade angle holding member includes a plate cam formed so as to contact the side of the blade holding member opposite to the insertion side of the pencil to change the tilt angle, and the plate cam is sharpened with a pencil. It is rotationally driven by a selection dial located on the handle shaft of the device.

Then, when the plate cam is rotated by the operation of the selection dial, the contact position between the plate cam and the blade holding member changes, and the angle of the blade holding member is set. Therefore, the sharpening angle of the pencil can be changed by a simple and easy-to-understand operation of rotating the selection dial.

According to the pencil sharpener according to the present invention, the sharpening angle of the sharpening portion can be easily and surely specified to the optimum angle according to the type of pencil and the hardness of the core.

According to the pencil sharpener according to claim 1, when sharpening a pencil, the rotary blade portion is held so as to be tiltable about the tilt axis, and the rotary blade portion is an elastic member in a direction in which the tilt angle increases. Is given an encouraging force.

Further, the blade holding member comes into contact with the blade angle holding member, and the tilt angle of the rotary blade is held at a predetermined angle. Then, the angle determining member determines the inclination angle of the rotary blade portion based on the cutting angle suitable for the hardness of the pencil lead.

Therefore, the angle of the rotary blade with respect to the insertion axis can be selected and set simply by operating the blade angle holding member, and the optimum angle according to the type and application of the pencil and the hardness of the core can be easily and surely set. You can specify and sharpen a pencil.

Further, according to the pencil sharpener according to claim 1, the angle of the blade holding member is determined by the radius of the angle holding inner surface portion on which the rolling member of the blade angle holding member rolls. Since this angle holding inner surface portion has a rotating surface having a different radius around the insertion axis, the blade holding is performed by linearly moving the blade angle holding member along the insertion axis with the angle determining member and setting the arrangement position. The rolling member rolling radius of the member, that is, the tilt angle of the blade holding member can be set.

Therefore, by rotating the angle determining member, it is possible to easily and surely specify the optimum angle according to the type and use of the pencil and the hardness of the core to sharpen the pencil.

Further, according to the pencil sharpener according to claim 2, since the angle holding inner surface portion includes a plurality of short cylinder inner surface portions and a conical inner surface portion connected to these, the angle of the blade portion angle holding member is determined. By making the member move back and forth by linear motion along the insertion axis and selecting the inner surface of the short cylinder where the rolling member rolls, the revolution radius of the rolling member of the blade holding member, that is, the tilt angle of the blade holding member. Can be set. Further, when the rolling member moves back and forth from one short cylinder inner surface portion to another short cylinder inner surface portion, the rolling member moves while rolling on the conical inner surface portion connecting them.

Therefore, the movement in the front-rear direction when the inclination angle is changed becomes smooth. Therefore, by rotating the angle determining member, it is possible to easily specify the tilt angle suitable for the hardness of the pencil step by step, and further, the rolling member is moved by operating the angle determining member at the time of selecting the step. The operation can be performed smoothly.

Further, according to the pencil sharpener according to claim 3, since the angle holding inner surface portion includes a conical inner surface portion in which the radius of the inner surface changes linearly along the insertion axis, the angle of the blade angle holding member is determined. By linearly moving the member along the insertion axis and selecting the position, that is, the radius of the conical inner surface on which the rolling member rolls, the revolving radius of the rolling member of the blade holding member, that is, the inclination of the blade holding member. You can set the angle.

Therefore, by rotating the angle determining member, it is possible to continuously and easily specify the inclination angle suitable for the hardness of the pencil lead.

Further, according to the pencil sharpener according to claim 4, the angle determining member is formed in a cylindrical shape having a larger diameter than the blade angle holding member and can be rotationally driven from the outside of the sharpener to hold the blade angle. It covers the outside of the member and includes a cam groove formed so that the protrusion of the blade angle holding member is inserted and the blade angle holding member is moved back and forth when the angle determining member is rotated. Therefore, by rotating the angle determining member, the protrusion inserted into the cam groove moves in the front-rear direction, and the blade angle holding member moves in the front-rear direction accordingly.

Then, as the blade angle holding member moves, the angle of the blade holding member determined by the blade angle holding member changes. Therefore, the sharpening angle of the pencil can be changed by a simple and easy-to-understand operation of rotating the angle determining member.

Further, according to the pencil sharpener according to claim 5, the angle determining member for determining the sharpening angle of the pencil includes a rotary dial arranged on the side of the pencil sharpener into which the pencil is inserted. Then, an icon indicating the shape of the sharpening angle of the selected pencil is displayed on this rotary dial. Therefore, by checking the displayed icon and operating the rotary dial, the angle determining member is rotated and the blade angle holding member operates. Thereby, the angle of the blade holding member is determined.

Therefore, the sharpening angle of the pencil can be changed and set by a simple and easy-to-understand operation of rotating the rotary dial while checking the icon displaying the sharpening angle.

Further, according to the pencil sharpener according to claim 6, the angle determining member includes a knob member that rotationally drives the angle determining member. Therefore, by rotating the angle determining member with the knob, the protrusion inserted in the cam groove moves in the front-rear direction, and the blade angle holding member moves in the front-rear direction accordingly. Then, as the blade angle holding member moves, the angle of the blade holding member changes. Therefore, the sharpening angle of the pencil can be changed by a simple and easy-to-understand operation of rotating the knob.

Further, according to the pencil sharpener according to claim 7, the angle determining member includes a lever member, and the lever member has a fulcrum arranged on the main body of the pencil sharpener on one end side and a power point on the other end. The blade angle holding member is operated linearly along the insertion axis between the force point and the fulcrum.

Therefore, by operating the lever member, the protrusion inserted into the cam groove moves in the front-rear direction, and the blade angle holding member moves in the front-rear direction accordingly. Then, as the blade angle holding member moves, the angle of the blade holding member changes. Therefore, the sharpening angle of the pencil can be changed by a simple and easy-to-understand operation of rotating the lever member.

Further, according to the pencil sharpener according to claim 8, the blade angle holding member is a plate cam formed so as to contact the side of the blade holding member opposite to the insertion side of the pencil to change the inclination angle. This plate cam is rotationally driven by a selection dial located on the handle shaft of a pencil sharpener.

Then, when the plate cam is rotated by the operation of the selection dial, the contact position between the plate cam and the blade holding member changes, and the angle of the blade holding member is set. Therefore, the sharpening angle of the pencil can be changed by a simple and easy-to-understand operation of rotating the selection dial.

The appearance of the pencil sharpener which concerns on 1st Embodiment of this invention is shown, (a) is a front view, (b) is a side view, (c) is a rear view, (d) is a plan view. It shows the internal structure of the sharpener of the pencil sharpener, (a) shows the case where the sharpening angle is 20 degrees, (b) shows the case where the sharpening angle is 26 degrees, (c) shows the case where the sharpening angle is 35 degrees, and (i) is each. A front view showing a dial, (ii) is a secondary cross section of FIG. 1 (a) showing an internal state. It is sectional drawing which shows the internal structure of the pencil sharpener. The setting state of the sharpening angle in the pencil sharpener is shown. (A) is a sharpening angle of 20 degrees, (b) is a sharpening angle of 26 degrees, and (c) is a perspective showing the inside of the pencil sharpener at a sharpening angle of 35 degrees. It is a figure. It shows the setting state of the sharpening angle of the pencil sharpener, (a) is a cross-sectional view showing an internal state of a sharpening angle of 35 degrees, (b) a sharpening angle of 26 degrees, and (c) a sharpening angle of 20 degrees. be. A pencil sharpener according to another embodiment of the present invention is shown, (a) is a partial front view of the pencil sharpener according to the second embodiment, and (b) is a pencil sharpener according to the second embodiment. FIG. 3C is a cross-sectional view of the pencil sharpener according to the third embodiment. The appearance of the pencil sharpener according to another embodiment of this invention is shown, (a) is a sectional view of the pencil sharpener which concerns on 4th Embodiment, and (b) is the pencil sharpener which concerns on 5th Embodiment. It is a subordinate cross-sectional view of a vessel. The appearance of the pencil sharpener according to another embodiment of the present invention is shown, (a) is a sectional view of the pencil sharpener according to a sixth embodiment, and (b) is a pencil sharpener according to a seventh embodiment. A cross-sectional view of the vessel, (c) is a front view showing an example of a cam, and (d) is a front view showing another example of a cam. It shows the pencil sharpener which concerns on 8th Embodiment of this invention, (a) is a secondary sectional view of the pencil sharpener, (b) is the perspective view of the mechanism part of the pencil sharpener. It is a schematic diagram which shows the sharpening state of a pencil.

A pencil sharpener according to a mode for carrying out the present invention will be described.

<First Embodiment>
Hereinafter, the pencil sharpener according to the first embodiment of the present invention will be described. 1A and 1B show the appearance of the pencil sharpener according to the first embodiment of the present invention, where FIG. 1A is a front view, FIG. 1B is a side view, FIG. 1C is a rear view, and FIG. 1D is a plan view. Is.

First, the appearance of the pencil sharpener 10 will be described. As shown in FIG. 1, the pencil sharpener 10 has a main body 11 formed of a front member 11A and a rear member 11B, a rotary dial 12 for setting a sharpening angle, a pencil insertion hole 13, a handle 14, and a sharpener case. It is configured with 15.

The rotary dial 12 is provided with a pair of display windows 16 and 17 for visually recognizing a pencil icon and hardness (characters such as HB and B) displayed on the main body 11 located on the back surface to indicate the degree of scraping. A direction display unit 18 indicating the rotation position of the rotation dial 12 is arranged on the rotation dial 12. The shapes of the rotary dial 12, the display windows 16, 17, and the direction display unit 18 are not limited to this example, and other shapes and designs may be used.

In the pencil sharpener 10 according to the present embodiment, as shown in FIG. 10, the pencil is sharpened in three stages, the sharpening angle is 20 degrees suitable for the hardness HB-2B, the sharpening angle is 26 degrees suitable for the hardness 2B-4B, and the hardness is 6B. It can be sharpened at a sharpening angle of 35 degrees, which is suitable for colored pencils.

In this way, in order to be able to select the sharpening angle of the pencil, the pencil sharpener 10 according to the present embodiment is inserted into the sharpening mechanism 20 of the pencil P and the insertion hole 13 as shown in FIGS. 2 and 3. It is provided with a feed mechanism 70 that holds the pencil P in the rotation direction and feeds it in the sharpening direction. In the pencil sharpener 10 according to the present embodiment, the configuration of the feed mechanism 70 is known and has the same configuration as a general pencil sharpener.

FIG. 2 shows the internal structure of the sharpener of the pencil sharpener, (a) shows a sharpening angle of 20 degrees, (b) shows a sharpening angle of 26 degrees, and (c) shows a sharpening angle of 35 degrees. i) is a front view showing a dial, (ii) is a secondary cross-sectional view of FIG. 1 (a) showing an internal state, and FIG. 3 is a cross-sectional view showing the internal structure of the pencil sharpener. Further, FIG. 4 shows the setting state of the sharpening angle in the same pencil sharpener, in which (a) is a sharpening angle of 20 degrees, (b) is a sharpening angle of 26 degrees, and (c) is a sharpening angle of 35 degrees. A perspective view showing the inside of the above, FIG. 5 shows a setting state of the sharpening angle of the pencil sharpener, (a) is a sharpening angle of 35 degrees, (b) is a sharpening angle of 26 degrees, and (c) is a sharpening angle. It is sectional drawing which shows the internal state of 20 degrees.

As shown in FIGS. 3 and 5, the shaving mechanism 20 includes a rotary blade portion 21, a blade holding member 22, a holding portion 23, an elastic member 24, and a first cylindrical member 40 that functions as an angle determining member. It includes a second cylindrical member 50 that functions as a blade angle holding member.

In the present embodiment, the first cylindrical member 40 can be rotationally driven by an external rotary dial 12, and the side wall portion 42 is provided with a cam groove 43. Similarly, the second cylindrical member 50 is arranged in the first cylindrical member 40 and includes a protrusion 58 that fits into the cam groove 43. When the first cylindrical member 40 is rotationally driven, the second cylindrical member 50 moves back and forth along the insertion shaft OP to change the angle of the blade holding member 22 in contact with the angle holding inner surface portion 50A with respect to the insertion shaft OP.

The rotary blade portion 21 is rotationally driven with respect to the tip portion of the pencil P by the handle gear 60 driven by the rotation of the handle 14. The rotary blade portion 21 includes known spiral teeth. The rotary blade portion 21 revolves around the pencil P and rotates on its axis to sharpen the pencil P.

The blade holding member 22 rotatably holds the rotary blade portion 21. Further, the blade holding member 22 can swing around the tilting shaft O set in the blade holding member 22, and the angle formed by the blade holding member 22, that is, the rotary blade portion 21 with the insertion shaft OP is variable.

Further, the blade holding member 22 revolves around the pencil P held by the holding portion 23 by the rotation operation of the handle 14. This mechanism is known, and the blade holding member 22 includes a rolling shaft holding portion 22A that holds the shaft 26 of the rolling member 25 configured as a roller member. In the present embodiment, the revolution radius of the rolling member 25 is determined by the contact position of the second cylindrical member 50 with respect to the angle holding inner surface portion 50A described later, whereby the tilt angle of the rotary blade portion 21 with respect to the insertion shaft OP is set. Will be done.

The elastic member 24 applies a rotational force (clockwise force in the figure) as an urging force to the blade holding member 22 holding the rotary blade portion 21 in a direction in which the inclination angle with the insertion shaft OP increases. In this embodiment, a torsion spring is used as the elastic member 24.

Next, the first cylindrical member 40 will be described. As shown in FIGS. 2 and 3, the first cylindrical member 40 is formed to have a larger diameter than the second cylindrical member 50. The first cylindrical member 40 includes a bottom portion 41 and a side wall portion 42. The first cylindrical member 40 is connected to the rotary dial 12 at the bottom 41 by a connecting member 31, and when the rotary dial 12 is rotated, it is rotationally driven and rotates. The rotary dial 12 constitutes an angle determining member.

Two cam grooves 43, 43 are formed in the side wall portion 42 of the first cylindrical member 40. A protrusion 58 formed on the outer peripheral surface of the second cylindrical member 50, which will be described later, engages with the cam grooves 43, 43 to cause the second cylindrical member 50 to linearly move (forward and backward) along the insertion shaft OP. .. The cam grooves 43, 43 are inclined with respect to the generatrix of the first cylindrical member 40 and are formed at symmetrical positions with respect to the insertion axis OP. By rotating the first cylindrical member 40, the protrusions 58, 58 of the engaged second cylindrical member 50 are driven in the front-rear direction, and the second cylindrical member 50 is moved back and forth.

Next, the second cylindrical member 50 will be described. As shown in FIGS. 2 and 4, in the second cylindrical member 50, the angle holding inner surface portion 50A contacts the rolling member 25 of the blade holding member 22 described above, and the tilt angle of the rotary blade portion 21 is designated. Hold at an angle.

The second cylindrical member 50 is arranged so that it can move back and forth only, and protrusions 58 and 58 that fit into the cam grooves 43 and 43 of the first cylindrical member 40 are formed on the outer peripheral surface. By rotationally driving the first cylindrical member 40, the second cylindrical member 50 moves in the front-rear direction along the insertion shaft OP.

The second cylindrical member 50 is arranged along the insertion axis OP. The second cylindrical member 50 includes an angle-holding inner surface portion 50A formed by a rotating surface having a different radius along the insertion shaft OP with the insertion shaft OP as the axis. Further, on the outer surface of the second cylindrical member 50, the above-mentioned two protrusions 58, 58 are formed so as to project.

Further, the second cylindrical member 50 is fitted into two sets of guide rails 19 and 19 formed so as to face the inside of the main body 11 to prohibit the rotation of the second cylindrical member 50, and the second cylindrical member 50. Is provided with two guide projections 56, 56 that allow only linear motion along the insertion axis OP.

In the present embodiment, as shown in FIG. 3, the angle holding inner surface portion 50A includes a plurality of short cylinder inner surface portions 51, 52, 53 having inner circumferences having different radii, and in this example, three short cylinder inner surface portions 51, 52, 53, and the short cylinder inner surface portion. It is provided with two conical inner surface portions 54, 55 connecting 51, 52, 53. The rolling member 25 rolls along the surface of the short cylindrical inner surface portions 51, 52, 53 of the angle holding inner surface portion 50A, which is set by the operation of the rotary dial 12 and the first cylindrical member 40.

In this example, the cutting angle is set to 20 degrees by the rolling member 25 coming into contact with the short cylinder inner surface portion 51, the cutting angle 26 degrees by the short cylinder inner surface portion 52, and the cutting angle 35 degrees by the short cylinder inner surface portion 53. .. As the rolling member, a member having another configuration of the roller member, for example, a rolling spherical member or the like can be used.

Next, the rotary dial 12 will be described. As shown in FIGS. 1 and 2, the rotary dial 12 includes two display windows 16 and 17, and a direction display unit 18. In the present embodiment, the display windows 16 and 17 are open so that the icons, characters, and the like written on the dial board 30 formed on the back surface of the rotary dial 12 can be visually recognized.

Three types of icons (pencil images) showing the sharpening state of the pencil shown in FIG. 10 are displayed on the dial substrate 30, and can be observed through the display window 16. Further, on the dial substrate 30, characters of the type indicating the hardness of the core (“HB-2B”, “2B-4B”, “6B-colored pencil”) shown in FIG. 10 are displayed and can be observed through the display window 17. .. Further, on the upper surface of the main body 11, a sharpened pencil icon is displayed at a position indicated by the direction display unit 18. The shapes of the rotary dial 12, the display windows 16 and 17, and the direction display unit 18 are. The shape can be changed as needed.

As shown in FIG. 2A, when the direction display unit 18 of the rotary dial 12 faces upward and is set to 20 degrees, the pencil sharpener 10 is set to sharpen the pencil with a sharpening angle of 20 degrees. ing. At this time, the display window 16 displays the pencil icon shown in FIG. 10A, and the display window 17 displays the hardness (HB-2B) of the matching pencil. Similarly, by rotating the rotary dial 12, the 26 degree icon and the matching pencil icon and hardness (2B-4B) in the state of FIG. 2 (b), and the 35 degree icon and the state of FIG. 2 (c). The hardness (6B-colored pencil) is displayed. The shapes and contents of these icons and characters can be changed as needed.

Therefore, the user can use the current pencil with the position of the direction display unit 18, the icon on the upper surface of the main body 11 indicated by the direction display unit 18, the icon that can be observed from the display window 16, and the hardness of the core that can be observed from the display window 17. The sharpening state of the sharpener 10 can be grasped.

Next, the operation of the pencil sharpener 10 according to the first embodiment will be described. First, the user selects the sharpening state of the pencil. This selection depends on the type of pencil, the hardness of the pencil and the condition of use. When the hardness is HB-2B, the shaving angle is 20 degrees, when the hardness is 2B-4B, the shaving angle is 26 degrees, and when the hardness is 6B or more or the colored pencils, the shaving angle is 35 degrees. When the user is a child in the lower grades of elementary school, it is desirable to increase the cutting angle.

As shown in FIGS. 2, 4 and 5, the cutting angle is arranged at a position where a desired angle is set by rotating the rotary dial 12. The user visually recognizes the position of the direction display unit 18 of the rotary dial 12, the icon on the upper surface of the main body 11 instructed by the direction display unit 18, the icon displayed on the display window 16, and the hardness of the pencil displayed on the display window 17. And select the sharpening angle of the pencil.

When the rotary dial 12 is rotated, as shown in FIGS. 2, 4 and 5, the first cylindrical member 40 rotates with the rotation of the rotary dial 12. As a result, the cam groove 43 of the first cylindrical member 40 rotates to guide the protrusion 58 of the second cylindrical member 50. At this time, since the second cylindrical member 50 can only move along the insertion axis OP, it moves in the front-rear direction along the insertion axis OP and is arranged at a designated position.

Then, the rolling member 25 of the blade holding member 22 rolls on the inner surface of the angle holding inner surface portion 50A from an arbitrary position and comes into contact with a position designated by the rotary dial 12, for example, the short cylinder inner surface portion 51. If the handle 14 is rotated when the rotary dial 12 is rotated, the rolling member 25 on the angle holding inner surface portion 50A moves smoothly.

In this state, the blade holding member 22 has a designated angle with respect to the insertion shaft OP, and when the pencil is inserted into the insertion hole 13 and held by the holding portion 23 while the handle 14 is rotated, the pencil P is fed. While being fed by the mechanism 70, it can be cut at a cutting angle specified by the rotary blade portion 21.

Next, the effect of the pencil sharpener 10 will be described. According to the pencil sharpener 10 according to the present embodiment, the sharpening angle suitable for the hardness of the core can be easily specified by the rotary dial 12.

Further, in the cutting mechanism 20, the rotary blade portion 21 is securely held by the rolling member 25 of the blade holding member 22 and the angle holding inner surface portion 50A of the second cylindrical member 50, so that the rotary blade portion 21 shakes. You can sharpen a pencil in a stable manner without having to.

In the above embodiment, the number of the short cylinder inner surface portion of the angle holding inner surface portion 50A is set to 3, but this number can be 2 or 4 or more.

<Second Embodiment>
FIG. 6A is a partial front view of the pencil sharpener according to the second embodiment, and FIG. 6B is a cross-sectional view of the pencil sharpener according to the second embodiment. The pencil sharpener 110, which is the second actual form of the present invention, will be described. The pencil sharpener 110 according to the present embodiment includes a knob member 111 that protrudes from the upper surface of the main body 11 of the pencil sharpener 110 and rotationally drives the first cylindrical member 40 as an angle determining member.

Since other configurations are the same as those of the pencil sharpener according to the first embodiment, the same members are designated by the same reference numerals and omitted.

According to the pencil sharpener 110 according to the present embodiment, since the number of constituent members can be reduced to make a simple configuration, it is possible to provide a pencil sharpener that can easily and stably set the sharpening angle at low cost.

<Third Embodiment>
FIG. 6C is a cross-sectional view of the pencil sharpener according to the third embodiment. In the pencil sharpener 120 according to the present embodiment, the angle holding inner surface portion 50A of the second cylindrical member 50, which is the blade angle holding member, has a conical inner surface portion in which the radius of the inner surface linearly changes along the insertion axis OP. It is set to 121. Since other configurations are the same as those of the pencil sharpener according to the first embodiment, the same members are designated by the same reference numerals and omitted.

According to the pencil sharpener 120 according to the present embodiment, the sharpening angle of the rotary blade portion 21 with respect to the insertion shaft OP can be continuously set to a desired angle that matches the hardness of the core, and the sharpening angle of the pencil is continuously changed. can.

<Fourth Embodiment>
FIG. 7A is a cross-sectional view of the pencil sharpener according to the fourth embodiment. The pencil sharpener 130 according to the present embodiment protrudes from the upper surface of the main body 11 of the pencil sharpener 130, is connected to the second cylindrical member 50 by the connecting member 132, and moves the second cylindrical member 50 along the insertion shaft OP. The slide member 131 is provided as an angle determining member. The pencil sharpener 130 is not provided with the rotary dial 12 of the pencil sharpener 10 of the first embodiment or the first cylindrical member 40. Since other configurations are the same as those of the pencil sharpener 10 according to the first embodiment, the same members are designated by the same reference numerals and omitted.

According to the pencil sharpener 130 according to the present embodiment, it is possible to provide a pencil sharpener that can easily and stably set the sharpening angle at low cost.

<Fifth Embodiment>
FIG. 7B is a cross-sectional view of the pencil sharpener according to the fifth embodiment. The pencil sharpener 140 according to the present embodiment includes a lever member 141 as an angle determining member. The lever member 141 is provided with a fulcrum 142 arranged on the main body 11 of the pencil sharpener on one end side, and as a force point for operating the other end, a second cylindrical member which is a blade angle holding member between the force point and the fulcrum 142. A joint portion 143 with 50 is provided. As a result, the second cylindrical member 50 is linearly operated along the insertion shaft OP. The pencil sharpener 140 is not provided with the rotary dial 12 of the pencil sharpener 10 of the first embodiment or the first cylindrical member 40. Since other configurations are the same as those of the pencil sharpener 10 according to the first embodiment, the same members are designated by the same reference numerals and omitted.

According to the pencil sharpener 140 according to the present embodiment, the lever member 141 can easily and stably set the sharpening angle with a small force.

<Sixth Embodiment>
FIG. 8A is a cross-sectional view of the pencil sharpener according to the sixth embodiment. In the pencil sharpener 150 according to the present embodiment, the second rolling member 151 is arranged at a position symmetrical with the rolling member 25 with the blade holding member 22 of the rotary blade portion 21 on the mounting side and the insertion shaft OP as the axis of symmetry. ing. The second rolling member 151 is rotatably arranged at the tip of the arm member 152 that swings around the tilting shaft O1, and comes into contact with the angle holding inner surface portion 50A as the second cylindrical member 50 moves. Roll.

According to the pencil sharpener 150 according to the present embodiment, since the rolling member 25 and the second rolling member 151 are provided at the target position, the second cylindrical member 50 is not subjected to a biased force. 50 can be driven stably.

<7th Embodiment>
FIG. 8B is a cross-sectional view of the pencil sharpener according to the seventh embodiment, and FIG. 8C is a front view showing an example of a cam. The pencil sharpener 160 according to the present embodiment includes a plate cam 161 as a blade angle holding member and a selection dial 163 as an angle determining member. The plate cam 161 contacts the rear end portion 162 of the blade holding member 22 on the side opposite to the insertion side of the pencil to change the inclination angle of the rotary blade portion 21 with the insertion shaft OP. As shown in FIG. 8 (c), the plate cam 161 is provided with a contour shape having a step portion for gradually changing the angle of the rotary blade portion 21.

Further, the angle determining member is arranged as a shaft portion (handle shaft portion) of the handle 14 of the pencil sharpener and is configured as a selection dial 163 for rotationally driving the plate cam 161.

According to the pencil sharpener 160 according to the present embodiment, the plate cam 161 is rotated by the operation of the selection dial 163, and the contact position with the rear end portion 162 of the blade holding member 22 is applied to the insertion shaft OP of the blade holding member 22. The angle changes. Therefore, the sharpening angle of the pencil can be changed according to the hardness of the core by a simple and easy-to-understand operation of rotating the selection dial 163.

In the above embodiment, the contour shape of the plate cam 161 is provided with a stepped portion (stepped cam), but as shown in FIG. 8D, there is no step and the angle of the blade holding member 22 is continuously changed. It may have a contour shape (stepless cam).

<8th Embodiment>
9A and 9B show a pencil sharpener according to an eighth embodiment of the present invention, FIG. 9A is a cross-sectional view of the pencil sharpener, and FIG. 9B is a perspective view of a mechanical portion of the pencil sharpener. The pencil sharpener 170 according to the present embodiment rotates the pencil and rotates the rotary blade portion 21 by driving the handle 14. Further, by changing the position of the blade holding member 22 by the position changing mechanism 171, the inclination angle of the rotary blade portion 21 with the insertion shaft OP is set.

The rotation mechanism 180 meshes with the first gear 181 rotated by the handle 14, the extension shaft 183 rotating coaxially with the first gear 181 and the second gear 184 rotationally driven by the extension shaft 183, and the second gear 184. A third gear 185 for rotating the feed mechanism 70 is provided. Then, a fourth gear 182 that rotates the rotary blade portion 21 is arranged on the first gear 181 so as to mesh with the first gear 181. By this mechanism, the pencil P and the rotary blade portion 21 are relatively rotated while the rotary blade portion 21 is rotated by the drive of the handle 14, and the pencil P is sharpened.

Further, in the pencil sharpener 170, the position of the blade angle holding member and the angle determining member is changed so as to contact the upper end portion of the blade holding member 22 and determine the position from the direction perpendicular to the insertion axis OP (upper in the figure). A mechanism 171 is provided. The blade holding member 22 is pushed by the elastic member 24 in a direction in which the angle with the insertion shaft OP opens.

Further, the position changing mechanism 171 contacts the position changing mechanism 171 from above to determine the position of the blade holding member 22. The position changing mechanism 171 includes a rotary handle 172 and a feed screw mechanism 173.

According to the pencil sharpener 170 according to the present embodiment, since the rotary blade portion 21 does not revolve, it is not necessary to hold and determine the angle of the revolving rotary blade portion 21 over the entire circumference, and the angle with the blade portion angle holding member is eliminated. The determining member can be made simple as a position changing mechanism 171.

The pencil sharpener according to the present invention can be sharpened by freely and surely specifying the sharpening angle of the sharpening portion according to the type and use of the pencil, and has industrial applicability.

10: Pencil sharpener 11: Main body 11A: Front member 11B: Rear member 12: Rotating dial (angle determination member)
13: Insertion hole 14: Handle 15: Shavings case 16: Display window 17: Display window 18: Direction display unit 19: Guide rail 20: Shaving mechanism 21: Rotary blade part 22: Blade holding member 22A: Rolling shaft holding part 23: Holding portion 24: Elastic member 25: Rolling member 26: Shaft 30: Dial substrate 31: Connecting member 40: First cylindrical member (angle determining member)
41: Bottom 42: Side wall 43: Cam groove 50: Second cylindrical member (blade angle holding member)
50A: Angle holding inner surface
51: Short cylinder inner surface portion 52: Short cylinder inner surface portion 53: Short cylinder inner surface portion 54: Conical inner surface portion 55: Conical inner surface portion 56: Guide protrusion
58: Protrusion 60: Handle gear 70: Feed mechanism 110: Pencil sharpener 111: Knob member (angle determination member)
120: Pencil sharpener 121: Conical inner surface 130: Pencil sharpener 131: Slide member (angle determining member)
132: Connecting member 140: Pencil sharpener 141: Lever member (angle determining member)
142: fulcrum 143: joint 150: pencil sharpener 151: second rolling member 152: arm member 160: pencil sharpener 161: plate cam (blade angle holding member)
162: Rear end 163: Selection dial (angle determination member)
170: Pencil sharpener 171: Position change mechanism (blade angle holding member, angle determining member)
172: Rotating handle 173: Feed screw mechanism 180: Rotating mechanism 181: 1st gear 182: 4th gear 183: Extension shaft 184: 2nd gear 185: 3rd gear O: Tilt shaft O1: Tilt shaft OP: Insertion shaft P :pencil

Claims (8)

A holding portion into which a pencil is inserted along the insertion axis is arranged with an inclination angle set with respect to the insertion axis, and is rotationally driven with respect to the tip portion of the pencil by rotation of the handle. In a pencil sharpener that has a rotary blade and sharpens the tip at a set sharpening angle.
A blade holding member that holds the rotary blade portion in the holding portion at a predetermined tilt angle so that the rotary blade portion can be tilted about a tilting axis set in the holding portion.
An elastic member that applies an urging force to the rotary blade portion in a direction in which the inclination angle increases,
A blade angle holding member that holds the tilt angle of the rotary blade at a predetermined angle,
A member for determining an angle capable of determining the inclination angle of the rotary blade portion based on a cutting angle suitable for the hardness of the pencil lead is provided.
The blade angle holding member includes an angle holding inner surface portion formed by a rotating surface having a different radius with the insertion shaft as an axis along the insertion shaft.
The blade holding member includes a rolling member that rolls in contact with the angle holding inner surface portion of the blade angle holding member.
The angle determining member is a pencil sharpener configured to rotate around the insertion shaft and to move the blade angle holding member back and forth along the direction of the insertion shaft. The blade angle holding member is formed in a cylindrical shape, and the angle holding inner surface portion has an inner circumference having different radii, and a plurality of short cylindrical inner surface portions arranged at predetermined intervals in the insertion axis direction, and the said. The pencil sharpener according to claim 1, wherein the pencil sharpener is formed between an inner surface portion of a short cylinder and is connected to the inner surface portion of the short cylinder and is formed from a conical inner surface portion having a different radius. The pencil sharpener according to claim 1, wherein the angle holding inner surface portion of the blade angle holding member includes a conical inner surface portion whose inner surface radius changes linearly along the insertion axis. The blade angle holding member is provided with a protrusion on the outer peripheral surface portion, and the angle determining member is formed in a cylindrical shape having a larger diameter than the blade angle holding member and can be rotationally driven from the outside of the pencil sharpener. Then, when the outside of the blade angle holding member is covered and the protrusion of the blade angle holding member is inserted and the angle determining member is rotated, the blade angle holding member is moved back and forth. The pencil sharpener according to any one of claims 1 to 3, further comprising a cam groove formed in. The angle determining member includes a rotary dial located on the side of the pencil sharpener into which the pencil is inserted.
The pencil sharpener according to claim 1, wherein a pencil image representing the shape of the sharpening angle of the selected pencil is displayed as an icon on the rotary dial. The pencil sharpener according to claim 4, further comprising a knob member protruding from the upper surface of the pencil sharpener to rotationally drive the angle determining member. A holding portion into which a pencil is inserted along the insertion axis is arranged with an inclination angle set with respect to the insertion axis, and is rotationally driven with respect to the tip portion of the pencil by rotation of the handle. In a pencil sharpener that has a rotary blade and sharpens the tip at a set sharpening angle.
A blade holding member that holds the rotary blade portion in the holding portion at a predetermined tilt angle so that the rotary blade portion can be tilted about a tilting axis set in the holding portion.
An elastic member that applies an urging force to the rotary blade portion in a direction in which the inclination angle increases,
A blade angle holding member that holds the tilt angle of the rotary blade at a predetermined angle,
A member for determining an angle capable of determining the inclination angle of the rotary blade portion based on a cutting angle suitable for the hardness of the pencil lead is provided.
The angle determining member is provided with a fulcrum arranged on the main body of the pencil sharpener on one end side, the other end is a force point, and the blade angle holding member is straight along the insertion axis between the force point and the fulcrum. A pencil sharpener characterized by having a lever member to operate. A holding portion into which a pencil is inserted along the insertion axis is arranged with an inclination angle set with respect to the insertion axis, and is rotationally driven with respect to the tip portion of the pencil by rotation of the handle. In a pencil sharpener having a rotary blade portion and sharpening the tip portion at a set sharpening angle, the rotary blade portion can be tilted around a tilt axis set in the holding portion at a predetermined tilt angle. A blade holding member that holds the rotary blade portion, an elastic member that applies an urging force to the rotary blade portion in a direction in which the tilt angle increases, and a blade that holds the tilt angle of the rotary blade portion at a predetermined angle. The portion angle holding member includes an angle determining member capable of determining the inclination angle of the rotary blade portion based on a cutting angle suitable for the hardness of the pencil lead, and the blade portion angle holding member is said to hold the blade portion. The angle-determining member comprises a plate cam formed to contact the side of the member opposite to the insertion side of the pencil and to change the tilt angle between the rotary blade portion and the insertion shaft. A pencil sharpener that is arranged on the handle shaft of the pencil sharpener and is a selection dial that rotationally drives the plate cam.

Images