JPH01317795A - Pencil sharpener - Google Patents

Abstract

PURPOSE:To cope with pencils having various diameters without displacing a roller rotary shaft by constituting elastic rollers so as to be slidable along the rotary shaft and energizing each pair of the elastic rollers in a mutual contact direction. CONSTITUTION:Rotary shafts 14, 18 are arranged at positions symmetric to a pencil piercing hole and held to the bearing parts 20, 21 formed to the first rotary member 10 in a freely rotatable manner. Rollers22, 23 and 26, 27 are respectively held to the rotary shafts 14, 18 in a freely rotatable manner and coil springs 24, 25 and 28, 29 respectively energize the rollers 22, 23 and 26, 27 in a mutual contact direction. When a pencil 8 is inserted, the rollers 22, 23 and 26, 27 are respectively separated by the pencil 8 and pushed between the rotary shafts 14, 18 and the pencil 8 by the repulsive forces of the compressed coil springs 24, 25 and 28, 29. When the rotary shafts 14, 18 are rotated, the rollers 22, 23 and 26, 27 are rotated by friction to send the pencil 8 in the direction shown by an arrow C.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a pencil sharpener.

2. Description of the Related Art Conventionally, some electric pencil sharpeners are equipped with a pencil feeding device that feeds a pencil using the rotational force of a motor. 8 and 9 show an example of a pencil sharpener equipped with a pencil feeding device. In Figures 8 and 9, 53
54 is a rotating shaft of the roller 53, and 55 is a roller gear for rotating the rotating shaft 54. 5
6 is a roller fixing plate, and the rotating shaft 54 is a roller fixing plate 5.
It is rotatably held by a roller holding section 57 provided upright at 6. 58 is a cutter holder rotated by a motor, and 59 is a cutter held by the cutter holder 58. A disk 60 is attached to the end of the cutter holder 58, and a protrusion row 61 that engages with the gear 55 is provided on the outer periphery of the disk 60. When the cutter holder 58 rotates, the disc 60 also rotates, and the rotational force is transmitted to the roller gear 55, causing the roller 53 to rotate. The roller holding portion 57 that holds the rotating shaft 54 can be elastically deformed. By deforming the roller holding portion 57, the rotating shaft 54 can be displaced, and it is possible to accommodate a plurality of types of pencils with different thicknesses.

Problem to be Solved by the Invention However, in the configuration in which the rotating shaft that holds the rollers is displaced as described above, even if the rotating shaft is largely displaced, there is no problem in transmitting the rotational force to the roller gear. However, in order to satisfy this condition, it was extremely difficult to design a rotation transmission system to the roller gear.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a pencil sharpener equipped with a pencil feeding device that can handle pencils of various thicknesses without displacing the roller rotation shaft. purpose.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention inserts a pencil into a rotating member that rotates around a central pencil insertion hole, and which rotates in response to the rotation of the rotating member. Two elastic rollers were provided so as to be sandwiched between the holes, and two elastic rollers were slidably held on each of the shafts, and the two elastic rollers were urged in the direction of contacting each other.

Effect With the above configuration, a total of four elastic rollers provided on the two shafts are pressed against the pencil by the springs, and the pencil is held between them, so that the distance between the two elastic rollers on the same shaft is By changing it, it becomes possible to handle multiple types of pencils with different thicknesses.

EXAMPLE Hereinafter, an example of a pencil sharpener according to the present invention will be described. In Fig. 5, 1 is a motor, 2 is a gear box equipped with a reduction gear, 3 is a rotating shaft for rotating the cutter, 4 is fixed to the rear end of the rotating shaft 3, and 4 is connected to a reduction gear in the gear box 2. The gears are engaged. 5
As shown in FIG. 6, the cutter is shaped like a windmill, and is fixed to the rotating shaft 3 at the center.

6 is a pencil accommodating portion that becomes narrower toward the tip. FIG. 7 is a cross-sectional view taken along a plane passing through the center of the pencil accommodating part 6, and an open lower part is formed in the part of the pencil accommodating part 6 facing the cutter 5, and it is inserted into the pencil accommodating part 6. A part of the pencil is sticking out from the lower opening. Further, the cutter 5 rotates very close to the opening lower part, and is configured to hit a pencil protruding from the opening lower part and sharpen the pencil. A pencil feeding device 9 is rotatably held at the upper part of the pencil accommodating portion 6, and feeds the pencil 8 inserted into the pencil accommodating portion 6 while rotating.

The configuration of the pencil feeding device 9 will be explained in detail below.

In FIG. 1, 10 is a first rotating member, and gear teeth 12 are formed on the outer edge. In Figure 3, 14
15 is a rotating shaft for a roller, and 15 is a gear fixed to the rotating shaft 14. The rotating shaft 14 is rotatably held in a bearing part 16.17 formed on the first rotating member 10. On the other hand 1
8 is also a rotating shaft for a roller, and 19 is a gear fixed to the rotating shaft 18. The rotating shaft 18 is disposed at a position symmetrical to the rotating shaft 14 with respect to the pencil through hole, and the first rotating member 10
A bearing formed in is rotatably held in part 20.21. 22 and 23 are rollers, each of which is rotatably held on the rotating shaft 14. Coil springs 24 and 25 bias the rollers 22 and 23, respectively, into contact with each other. On the other hand 26
and 27 are also rollers, each of which is rotatably held on the rotating shaft 18. Coil springs 28 and 29 bias rollers 26 and 27, respectively, toward contact with each other.

In FIG. 1, 30 is a second rotating member, and gear teeth 31 are formed on the outer edge. The number of teeth of the gear tooth portion 31 of the second rotating member is designed to be smaller than the number of teeth of the gear tooth portion 12 of the first rotating member.
It is a gear tooth formed inside the 0. Second rotating member 30
is rotatably fitted to the first rotating member 10. When the second rotating member 30 is fitted onto the first rotating member 10, the gear teeth 32 mesh with the gears 15, 19.

In FIG. 2, 33 is a power transmission gear for transmitting rotational force to the pencil feeding device 9, and receives the rotational force from the motor 1 via a gear group (not shown) provided separately.

34 is a gear that meshes with the gear tooth portion 12, and 35 is the gear tooth portion 3.
1, and each is fixed to a shaft 36. The diameter of the gear tooth portion 31 of the second rotating member 30 is smaller than the diameter of the gear tooth portion 12 of the first rotating member 10.
5 is larger than the gear 34, when the first rotating member 10 rotates, the second rotating member 30 rotates faster than the first rotating member 10. The difference in rotational speed is the gear tooth 1
2 and the gear ratio of the gear 34, and the gear tooth portion 31 and the gear 35
Determined by the gear ratio.

The rotating shaft 14 and the rotating shaft 18 in the first rotating member 10 rotate at a speed corresponding to the rotational speed difference between the first rotating member 10 and the second rotating member 30. FIG. 4 shows a state in which a pencil is inserted. In FIG. 4, roller 22 and roller 23
are each pulled apart by a pencil 8 and by a roller 26.
and roller 27 are similarly pulled apart by pencil 8. In this state, the compressed spring 24.25
The rollers 22, 23 are pushed between the rotating shaft 14 and the pencil 8 by the repulsive force of pushed in between.

The operation will be explained below. Pencil 8 as shown in Figure 7
When the pencil is inserted, the motor 1 is rotated by the switch device 37 for detecting a pencil, and the cutter 5 is accordingly rotated. Further, the power transmission gear 33 rotates, and its rotational force is transmitted to the first rotating member 10, so that the first rotating member 10 rotates in the direction of arrow B. The pencil 8 sandwiched between the rollers 11 and 12 also rotates in the direction of arrow B. Further, due to the rotation of the first rotating member 10, the gears 34 and 35 rotate in the direction of arrow A, and receiving rotational force from the gear 35 causes the second rotating member 30 to rotate.
rotates faster than the first rotating member 10. Therefore, the rotating shaft 14 and the rotating shaft 18 rotate. When the rotating shaft 14 and the rotating shaft 18 rotate, the rollers 22,
23 and rollers 26 and 27 rotate, and the pencil 8 is fed in the direction of arrow C. However, if the load applied to the pencil 8 is abnormally large, or if the pencil 8 is forcibly pulled back in the opposite direction, the rollers 22, 23 and rollers 26, 27
A slip occurs between the rotating shaft 14 and the rotating shaft 18.

Effects of the Invention As described above, the present invention provides a rotary member that rotates around a central pencil insertion hole, and two shafts that rotate in response to the rotation of the rotary member so as to sandwich the pencil insertion hole, Two elastic rollers are slidably held on each of the above-mentioned shafts, and a spring is provided that biases the two elastic rollers in the direction of contacting each other, so that a total of 4 The pencil is held between two elastic rollers,
The distance between the two shafts remains the same (but it can accommodate multiple types of pencils with different thicknesses. Therefore, it is easy to design the rotation transmission system to the rotation shaft.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a pencil feeding device of a pencil sharpener according to an embodiment of the present invention, FIG. 2 is a perspective view of the same pencil feeding device,
Figure 3 is a plan view of the first rotating member of the pencil feeding device;
The figure is a plan view of the first rotating member of the pencil feeding device in the pencil inserted state, FIG. 5 is a central vertical cross-sectional view of the pencil sharpener in the same embodiment, FIG. The figure is a longitudinal cross-sectional view taken along the pencil insertion hole of the same pencil sharpener.
FIG. 8 is a front view of a conventional pencil feeding device, and FIG. 9 is a side view of the same pencil feeding device. l...Motor 2...Gear box 3
... Rotating shaft 5 ... Cutter 6 ...
-Pencil storage section 9...Pencil feeding device 10...
・First rotating member 12... Gear tooth portion 14.18... Rotating shaft 15.19... Gear 22.23, 26.27... Roller 24.25, 2
8.29 Spring 30 Second rotating member 31 Gear tooth portion 32 Gear tooth 3
3... Name of power transmission gear agent Patent attorney Toshio Nakao and one other person Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 8 Figure 9

Claims (1)

[Claims] a cutter, a means for rotating the cutter, a rotating member having a pencil through hole in the center and rotating around the pencil through hole, and two supporting rollers each supporting a pair of pencil guiding elastic rollers on the rotating member. A pencil sharpener characterized in that a rotating shaft is provided, the elastic rollers are configured to be slidable along the rotating shaft, and each pair of elastic rollers is biased in a direction in which they come into contact with each other.