JP2012210711A - Pencil sharpener - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pencil sharpener by which even a child of less power can sharpen a pencil easily while controlling an operation handle not to be enlarged.SOLUTION: A cutting unit 4 includes: a member 11 to be mounted thereon; an operation handle 12 and a rotor 13, both rotatable around a longitudinal axis; a reduction mechanism 14 for decelerating the rotation of the operation handle 12 to transmit it to the rotor 13; and a cutting blade 15 provided on the rotor 13. The reduction mechanism 14 decelerates the rotation of the operation handle 12 and transmits it to the rotor. Accordingly, the rotor 13 provided with the cutting blade 15 can be rotated with large torque, and therefore even a child of less power can sharpen a pencil easily. Moreover, the operation handle 12 can be controlled not to be enlarged, so that the operation handle 12 hardly becomes an obstacle.

Description

  The present invention relates to a pencil sharpener having an operation handle.

  Patent Document 1 discloses a manual pencil sharpener having a handle. In this pencil sharpener, a rotating shaft provided with a cutter is connected to the center of the handle, and the pencil is sharpened by a cutter that rotates together with the rotating shaft by rotating the handle by hand.

JP-A-6-48094

  By the way, in the pencil sharpener in which the rotating shaft having the cutter is directly connected to the handle as in Patent Document 1, it is necessary to rotate the handle with a relatively large force when sharpening the pencil. For this reason, the operation | work which turns a handle | steering may become a burden especially in a powerless young child etc. Also, if the handle is enlarged and the length from the rotation center of the handle to the hand picked portion is increased, the handle can be rotated with a relatively small force. .

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a pencil sharpener that can easily sharpen a pencil even by a weak child or the like while suppressing an increase in the size of an operation handle.

  In order to solve the above problems, the pencil sharpener of the present invention includes an operation handle 12, a rotating body 13 provided with a cutting blade 15, and a speed reduction mechanism 14 that decelerates and transmits the rotation of the operation handle 12 to the rotating body 13. It is characterized by comprising.

  The rotation center of the operation handle 12 is preferably disposed above the rotation center of the rotating body 13.

  Further, it is preferable that the operation handle 12 is rotated about the vertical axis.

  Further, it is preferable that the cutting unit 4 having the cutting blade 15, the rotating body 13, the speed reduction mechanism 14, and the operation handle 12 is provided, and the cutting unit 4 is detachably attached to the main body case 2.

  In the invention according to claim 1 of the present invention, it is possible to rotate the rotating body provided with the cutting blade with a large rotational force by decelerating the rotation of the operation handle by the speed reduction mechanism and transmitting it to the rotating body. Yes, even a weak child can easily sharpen a pencil. In addition, an increase in the size of the operation handle is suppressed, and the operation handle is less likely to get in the way.

  In addition to the effect of claim 1, the invention according to claim 2 has the pencil sharpener placed on the desk by arranging the rotation center of the operation handle above the rotation center of the rotating body. In this case, the distance from the upper surface of the desk to the operation portion of the operation handle can be increased. For this reason, when the operation handle is rotated, it is difficult for the hand holding the operation portion to hit the desk. In addition, it is possible to rotate the operation handle while the operation part is firmly grasped by hand, so that a powerless child or the like can sharpen the pencil more easily.

  In addition to the effect of claim 1, the invention according to claim 3 is such that the operation handle is rotated about the vertical axis, so that when the pencil sharpener is installed on the desk, The distance from the upper surface to the operation portion of the operation handle can be increased. For this reason, when the operation handle is rotated, it is difficult for the hand holding the operation portion to hit the desk. In addition, it is possible to rotate the operation handle while the operation part is firmly grasped by hand, so that a powerless child or the like can sharpen the pencil more easily.

  According to a fourth aspect of the invention, in addition to the effect of any one of the first to third aspects, a cutting unit having a cutting blade, a rotating body, a speed reduction mechanism, and an operation handle is attached to and detached from the main body case. By making it flexible, the maintainability is improved, for example, the clogging core can be easily removed by removing the cutting unit from the main body case.

It is sectional drawing of the pencil sharpener of 1st embodiment. It is an exploded view of a cutting unit same as the above. It is a front view which shows the deceleration mechanism same as the above. It is explanatory drawing which shows the state which removed the cutting unit same as the above from the main body case. It is a front view which shows the deceleration mechanism of another example. It is sectional drawing of the pencil sharpener of 2nd embodiment.

  Hereinafter, the present invention will be described with reference to the accompanying drawings. A pencil sharpener 1 according to the first embodiment shown in FIG. 1 includes an outer main body case 2, a feed mechanism 3 housed in the main body case 2, a cutting unit 4 attached to the main body case 2, and a main body case 2. A waste box 5 is provided that is detachably stored.

  The main body case 2 formed in a vertically long shape has a horizontal lower surface so that it can be placed on a desk independently. An insertion hole 7 penetrating in the front-rear direction is formed in the upper part of the front wall portion 6 of the main body case 2. The feeding mechanism 3 has a function of feeding the pencil 8 inserted into the main body case 2 through the insertion hole 7 to the front rotating body 13 side, and is housed in the upper part of the main body case 2.

  An attachment hole 9 penetrating in the front-rear direction is formed in the upper portion of the rear wall portion 10 of the main body case 2, and the cutting unit 4 is detachably attached to the upper portion of the rear wall portion 10 of the main body case 2. As shown in FIG. 2, the cutting unit 4 includes the mounted member 11, the operating handle 12 and the rotating body 13 that are rotatable around the front and rear axes, and the rotating speed of the operating handle 12 is reduced to the rotating body 13. It comprises a speed reduction mechanism 14 for transmission and a cutting blade 15 provided on the rotating body 13.

  The mounted member 11 includes a mounted body 16 and a cover body 17. The mounted body 16 constitutes an internal gear, and includes a rear plate portion 18 disposed along the outer surface of the rear wall portion 10 of the main body case 2, and projects forward from the rear plate portion 18 to teeth on the inner peripheral surface. It is comprised with the ring-shaped internal gear part 19 in which the part was formed. A through hole 20 is formed in the rear plate portion 18 so as to communicate with the inner side of the internal gear portion 19.

  The mounted body 16 is detachably attached to the peripheral portion of the mounting hole 9 by bayonet-type locking in a state where the internal gear portion 19 is inserted into the mounting hole 9 of the main body case 2. Although not shown, a claw portion is formed on the outer peripheral surface of the internal gear portion 19, and a notch is formed on the peripheral portion of the mounting hole 9. The bayonet-type locking is performed by inserting the claw portion into the main body case 2 through the notch, and then attaching the attached body 16 to the direction operation handle 12 indicated by the arrow in FIG. This is done by rotating in the same direction as the rotation direction (hereinafter referred to as clockwise direction) and locking the claw portion to the inner surface of the rear wall portion 10.

  The cover body 17 is formed in a cap shape that opens to the front, is attached to the body to be mounted 16, and covers the rear plate portion 18 exposed to the outside of the main body case 2.

  As shown in FIG. 3, the speed reduction mechanism 14 includes gears 22 (221 to 223) provided in three stages in the vertical direction, and these gears 22 are accommodated between the cover body 17 and the rear plate portion 18. Each gear 22 is a spur gear that is supported by the rear plate portion 18 and the cover body 17 so as to be rotatable about the front-rear axis. Each gear 22 has a larger diameter as the gear 22 positioned below, and has a larger number of teeth as the gear 22 positioned below.

  At the front part of the rotating body 13, a holding cylinder part 23 is formed in which the tip part of the pencil 8 inserted into the main body case 2 through the insertion hole 7 is accommodated. The holding cylinder portion 23 is positioned at the rotation center of the rotating body 13, and a slit (not shown) that exposes the tip of the pencil 8 inserted into the holding cylinder portion 23 is part of the circumferential direction of the holding cylinder portion 23. Is formed.

  The rotating body 13 is provided with a shaft 24 that is inclined so as to move away from the diameter of the rotating body 13 toward the front side. The cutting blade 15 has a cylindrical shape, and a shaft 24 is rotatably inserted therein and is rotatably supported by the shaft 24. On the outer peripheral surface excluding the rear end portion of the cutting blade 15, a plurality of spiral blade portions 25 for cutting the tip portion of the pencil 8 exposed from the slit are formed in the circumferential direction. At the rear end portion of the cutting blade 15, a planet gear portion 26 is provided as a planetary gear that meshes with the internal gear portion 19 of the mounted body 16.

  A male screw portion 27 is formed at the rear end portion of the rotating body 13. The male screw portion 27 is passed through the through hole 20 and screwed into the gear 223 located at the lowest stage of the gear 22, whereby the rotating body 13 is connected to the gear 223. The gear 223 constitutes a planetary gear mechanism by combining the internal gear portion 19 and the planet gear portion 26, and functions as a sun gear of the planetary gear mechanism.

  The operation handle 12 is composed of a rod-shaped arm portion 28 disposed along the outer surface of the rear wall portion 10 of the main body case 2 via the attached member 11 and an operation portion 29 provided at one end of the arm portion 28. Has been. The operation portion 29 is formed in a cylindrical shape whose central axis direction is parallel to the front-rear direction, and is supported rotatably around the front-rear axis by a shaft protruding rearward from the arm portion 28.

  Of the gears 22, a screw shaft portion 31 protrudes rearward from the gear 221 located at the uppermost stage. The screw shaft portion 31 protrudes rearward through the cover body 17 and is screwed into the end portion of the arm portion 28 opposite to the operation portion 29. As a result, the operation handle 12 is connected to the gear 221. The end of the arm portion 28 serving as the rotation center of the operation handle 12 on the screw shaft portion 31 side is disposed above the male screw portion 27 serving as the rotation center of the rotating body 13, and the rotating shaft of the operation handle 12 is the rotating body 13. It is located above the rotation axis.

  The cutting unit 4 is detachably attached to the main body case 2 by attaching the attached body 16 to the main body case 2 by bayonet-type locking.

  In order to sharpen the pencil 8 using the pencil sharpener 1 of the present embodiment, with the pencil 8 inserted into the holding cylinder portion 23 through the insertion hole 7, the operation portion 29 is picked with a finger or as shown in FIG. The operation handle 12 is rotated clockwise around the screw shaft 31 with this hand. Then, the uppermost gear 221 that is integrally connected to the arm portion 28 of the gear 22 rotates in the same direction as the operation handle 12, and the middle gear 222 that meshes with the gear 221 rotates in the opposite direction to the gear 221. The lowermost gear 223 that meshes with the gear 222 rotates in the opposite direction to the gear 222, that is, in the same direction as the rotation direction of the operation handle 12.

  When the lowermost gear 223 rotates in this way, the rotating body 13 and the cutting blade 15 integrally connected to the gear 223 rotate around the male screw portion 27 together with the gear 223. At this time, the planet gear portion 26 of the cutting blade 15 meshes with the internal gear portion 19, whereby the cutting blade 15 rotates about the shaft 24. That is, the cutting blade 15 revolves around the male thread portion 27 of the rotating body 13 and rotates around the shaft 24, and the tip of the pencil 8 inserted into the holding cylinder portion 23 by the blade portion 25 of the cutting blade 15. The part is sharpened.

  The feed mechanism 3 is supported by a support 33 attached to the main body case 2, a rotating member 34 that is supported by the support 33 so as to be rotatable about the front-rear axis, and is supported by the support 33 so as to be rotatable about the vertical axis. , A pair of left and right rotating shafts 35 disposed in front of the rotating member 34, and a gear 36 and a roller 37 fixed to each rotating shaft 35.

  A fitting hole 38 that opens rearward is formed on the rear surface of the rotating member 34. The front end portion of the holding cylinder portion 23 of the rotating body 13 is fitted into the fitting hole 38 so that it cannot be rotated from the rear and can be inserted and removed.

  A pair of teeth portions (not shown) that are 180 degrees apart in the circumferential direction are formed on the outer peripheral portion of the front surface of the rotating member 34. Each time the rotating member 34 rotates by a predetermined angle in the circumferential direction, these teeth engage with the gear 36 at the corresponding position to rotate the gear 36 about the vertical axis by a predetermined angle.

  The rollers 37 provided on the respective rotation shafts 35 are opposed to each other, and the pencil 8 inserted into the main body case 2 through the insertion hole 7 is sandwiched between the rollers 37.

  When the operation handle 12 is rotated as described above, the rotating body 13 and the rotating member 34 integrally connected to the rotating body 13 are rotated, and the gears 36 are rotated by the teeth of the rotating member 34. Then, both the rotating shafts 35 and the rollers 37 provided on the respective rotating shafts 35 rotate around the vertical axis, and the pencil 8 is pressed by these both rollers 37. Therefore, when the operation handle 12 is rotated and the pencil 8 is shaved as described above, the pencil 8 is fed forward by the feeding mechanism 3.

  The waste box 5 opens upward and is stored in the lower part of the main body case 2. An outlet 39 is formed in the lower part of the front wall 6 of the main body case 2, and the waste box 5 is taken in and out of the outlet 39. The waste box 5 is disposed below the holding cylinder portion 23 and receives the shavings of the pencil 8 cut by the cutting blade 15.

  The pencil sharpener 1 of the present embodiment described above decelerates the rotation of the operation handle 12 by the speed reduction mechanism 14 and transmits it to the rotary body 13, thereby causing the rotary body 13 provided with the cutting blade 15 to have a large rotational force. Can rotate. Therefore, even a powerless child or the like can sharpen the pencil 8 easily. Further, the distance L1 (see FIG. 1) from the rotation center of the operation handle 12 to the operation unit 29 can be shortened. For this reason, the length of the arm portion 28 of the operation handle 12 can be shortened so that the operation handle 12 does not get in the way.

  Further, in the present embodiment, the rotation center of the operation handle 12 is disposed above the rotation center of the rotating body 13, and when the main body case 2 is installed on the desk, the operation handle 12 is The distance L2 (see FIG. 1) to the operation unit 29 can be increased. For this reason, when the operation handle 12 is rotated, it is difficult for the hand holding the operation unit 29 to hit the desk. In addition, as shown in FIG. 1, the operation handle 12 can be rotated while the operation unit 29 is firmly grasped by hand, whereby a powerless child or the like can sharpen the pencil 8 more easily.

  In the present embodiment, the cutting unit 4 having the cutting blade 15, the rotating body 13, the speed reduction mechanism 14, and the operation handle 12 is provided, and the cutting unit 4 is detachable from the main body case 2. For example, there is a possibility that the broken core 40 of the pencil 8 is clogged between the rotating body 13 and the cutting blade 15. In this case, the cutting unit 4 is removed from the main body case 2 as shown in FIG. The maintainability is improved. Although not shown in the drawings, for example, a pencil sharpener having a cutting unit in which the speed reduction mechanism 14 and the cover body 17 are omitted in the cutting unit 4 of the present embodiment and the operation handle 12 is directly connected to the rotating body 13 is provided. The pencil sharpener provided with the speed reduction mechanism 14 can be obtained simply by replacing the cutting unit with the cutting unit 4 of the present embodiment.

  In the present embodiment, the speed reduction mechanism 14 is configured by the three-stage gear 22, so that the rotation direction of the rotating body 13 provided with the cutting blade 15 can be the same as the rotation direction of the operation handle 12. . For this reason, the direction of rotation of the operation handle 12 and the direction of rotation of the cutting blade 15 that actually scrapes the pencil 8 (including both revolution and rotation) are aligned, and a feeling of shaving without a sense of incongruity is obtained.

  In the present embodiment, the speed reduction mechanism 14 is configured by the three-stage gear 22, but the same effect can be obtained when the speed reduction mechanism 14 is configured by five or more stages and the odd-numbered gears 22. Further, the speed reduction mechanism 14 is not limited to the one configured with the odd-numbered gears 22 and may be configured with the even-numbered gears 22.

  Further, the speed reduction mechanism 14 is not limited to a configuration including a plurality of gears 22 in which adjacent gears 22 mesh with each other. As an example of this, the speed reduction mechanism 14 is configured by a belt speed reduction device 43 as shown in FIG. The belt reduction device 43 includes an upper pulley 44 connected to the operation handle 12, a lower pulley 45 connected to the rotating body 13, and a toothed belt 46 wound around the pulleys 44 and 45. . The lower pulley 45 has a larger diameter than the upper pulley 44, and the toothed belt 46 is set such that the number of teeth 47 that mesh with the lower pulley 45 is larger than the number of teeth 47 that mesh with the upper pulley 44. Thus, even when the speed reduction mechanism 14 is configured by the belt speed reduction device 43, the same effect as that obtained when the speed reduction mechanism 14 is configured by a plurality of stages of gears 22 is obtained.

  Moreover, in this embodiment, the to-be-attached body 16 is attached to the main body case 2 by the bayonet-type latching. In this bayonet-type locking, the mounted body 16 attached to the main body case 2 is restricted from rotating clockwise by a rib or the like formed on the main body case 2, so that the operation handle 12 is removed when the pencil is sharpened. There is no problem when turning in the clockwise direction, which is the direction of rotation. However, in this embodiment, since the rotation center of the operation handle 12 is deviated from the rotation center of the rotating body 13, when the operation handle 12 is rotated counterclockwise, the mounted body 16 rotates counterclockwise. There is a risk of disengagement. Therefore, the main body case 2 is preferably provided with means for preventing the attached body 16 such as a protrusion from rotating counterclockwise, in addition to the bayonet type locking means.

  Moreover, in this embodiment, although the rotating shaft direction of the rotary body 13, each gear 22, and the operation handle 12 was made parallel to the front-back direction, you may incline with respect to the front-back direction. That is, the rotator 13, the gears 22, and the operation handle 12 only need to rotate about the horizontal axis including the direction in which the rotation axis direction is inclined with respect to the front-rear direction. In this embodiment, the rotation axis direction of the rotating body 13 and the rotation axis direction of the operation handle 12 are made parallel, but they may be made non-parallel.

  Next, the pencil sharpener 1 according to the second embodiment will be described. In the following description, the same components as those in the first embodiment are given the same numbers, and redundant descriptions are omitted.

  In the pencil sharpener 1 of this embodiment shown in FIG. 6, the cutting unit 4 does not include the operation handle 12 and the speed reduction mechanism 14, and is detachable by bayonet-type locking to the rear wall portion 10 of the main body case 2. The mounted member 48 is attached, the rotating body 13 is provided so as to be rotatable around the longitudinal axis with respect to the mounted member 48, and the cutting blade 15 is provided on the rotating body 13.

  The operation handle 12 is provided on the upper surface portion 50 of the main body case 2. The operation handle 12 is disposed along the outer surface of the upper surface portion 50 and is rotatable around the vertical axis, and on the outer end portion of the rotation plate 51. The operation unit 52 is provided. The operation unit 52 is formed in a cylindrical shape whose central axis direction is parallel to the vertical direction, and is supported rotatably around the vertical axis by an axis protruding upward from the operation handle 12.

  The speed reduction mechanism 14 has a function of converting the rotation axis direction of the operation handle 12, and includes two gears 53 housed in the upper part of the main body case 2. One gear 531 of the gears 53 is a bevel gear that rotates about the vertical axis, and the other gear 532 is a spur gear that meshes with the gear 531 and rotates about the front-rear axis.

  The central portion of the gear 531 is connected to the central portion of the rotating plate 51 by a fixing tool 54, and the front end portion of the rotating body 13 is fitted to the central portion of the gear 532 so as not to be rotatable and detachable. The number of teeth of the gear 532 is larger than the number of teeth of the gear 531.

  In order to sharpen the pencil 8 using the pencil sharpener 1 of the present embodiment, the operation part 52 is picked with a finger while the pencil 8 is inserted into the holding cylinder part 23 through the insertion hole 7, or as shown in FIG. The operating handle 12 is rotated around the fixing tool 54 with this hand. Then, the gear 531 rotates about the vertical axis, and the gear 532 engaged with the gear 531 rotates about the front-rear axis. As a result, the rotating body 13 connected to the gear 532 rotates around the longitudinal axis, and the pencil 8 is shaved by the cutting blade 15 provided on the rotating body 13.

  Note that the feed mechanism 3 of the present embodiment is configured such that the front end portion of the rotating body 13 is detachably connected to the rotating member 34 or the gear 532 is connected to the rotating member 34 via the insertion hole 7 as in the first embodiment. Then, the pencil 8 inserted into the main body case 2 is sent to the front rotating body 13 side.

  The pencil sharpener 1 of the present embodiment described above also reduces the rotation of the operation handle 12 by the speed reduction mechanism 14 and transmits it to the rotary body 13, so that the rotary body 13 provided with the cutting blade 15 can be rotated with a large rotational force. Can be rotated.

  In particular, the operation handle 12 rotates about the vertical axis, and when the main body case 2 is installed on a desk, the distance from the upper surface of the desk to the operation section 52 of the operation handle 12 can be increased. . For this reason, when the operation handle 12 is rotated, it is difficult for the hand holding the operation unit 52 to hit the desk. Further, as shown in FIG. 6, it is possible to rotate the operation handle 12 in a state in which the operation unit 52 is firmly grasped by hand, so that a powerless child or the like can sharpen the pencil 8 more easily. Further, the cutting unit 4 of this embodiment is also detachable from the main body case 2, and the core 40 can be easily removed by removing the cutting unit 4 from the main body case 2.

  In the present embodiment, the speed reduction mechanism 14 is configured by the two gears 53, but the speed reduction mechanism 14 is not limited to this, and may be configured by, for example, three or more gears 53. In the present embodiment, the rotation axis direction of the operation handle 12 is parallel to the vertical direction, but may be inclined with respect to the vertical direction. That is, the operation handle 12 only needs to rotate about the vertical axis including the direction in which the rotation axis direction is inclined with respect to the vertical direction. In the present embodiment, the example in which the cutting unit 4 does not include the operation handle 12 and the speed reduction mechanism 14 has been described. However, as in the first embodiment, the cutting blade 15, the rotating body 13, the speed reduction mechanism 14, and The cutting unit 4 having the operation handle 12 may be used.

  Further, the feeding mechanism 3 in each of the above embodiments may be configured by a longitudinally movable chuck or the like that holds the pencil 8 in a state of being inserted into the holding cylinder portion 23 through the insertion hole 7. May be omitted.

  In each of the above embodiments, the waste bin 5 can be drawn forward from the main body case 2, but the outlet 39 is provided in the lower part of the rear wall portion 10 of the main case 2, and the waste bin 5 is located behind the main case 2. You may be allowed to pull out.

DESCRIPTION OF SYMBOLS 1 Pencil sharpener 4 Cutting unit 12 Operation handle 13 Rotating body 14 Deceleration mechanism 15 Cutting blade

Claims (4)

  A pencil sharpener comprising: an operating handle; a rotating body provided with a cutting blade; and a speed reducing mechanism that decelerates the rotation of the operating handle and transmits it to the rotating body.   The pencil sharpener according to claim 1, wherein a rotation center of the operation handle is disposed above a rotation center of the rotating body.   The pencil sharpener according to claim 1, wherein the operation handle rotates about a vertical axis.   The cutting unit having the cutting blade, a rotating body, a speed reduction mechanism, and an operation handle is provided, and the cutting unit is detachable from the main body case. Pencil sharpener.

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