JPS6339106Y2 - - Google Patents

Description

[Detailed description of the invention] This invention uses a pencil sharpener to sharpen the pencil lead along with the pencil shaft, or simply to sharpen the pencil lead, by leaving a rounded edge on the tip of the pencil lead or sharpening it.
In order to sharpen to the desired thickness (hereinafter referred to as the lead diameter), the pencil is configured so that the minute dimensions can be moved freely, and it can be adapted to allow the user to sharpen to the desired lead diameter. It has a simple structure and is designed to prevent failures.

Conventionally, a configuration for adjusting the sharpening of the tip of a pencil lead has already been proposed, for example, in Japanese Utility Model Publication No. 49-6707. In this proposal, a thread is engraved on the outer circumferential surface of the adjustment rod to correspond to the rotary cutting blade and screwed together.
Since this screw is adjusted by rotating in the direction of screwing in and screwing out, vibration during cutting may cause the screw to be misaligned in the set position, resulting in variations in the core diameter to be cut, and the desired core diameter. However, the present invention is an improvement on this point.

Below, the drawings showing the embodiments will be explained.
Figure 1 is a longitudinal sectional view of the lead diameter adjustment mechanism in a state where the lead diameter adjustment mechanism is fitted and fixed into a part of the outer case of the pencil sharpener, and Figure 2 is a diagram of the threaded portion between the rotating shaft and the lead diameter adjustment shaft. In the partially enlarged vertical cross-sectional view, A is a lead diameter adjustment mechanism, which includes a rotating shaft 1 and a central hole 10 into which a pencil is inserted into the front shaft portion 1a of the rotating shaft 1.
A rotary cutting blade 2 that cuts the rotary shaft 1 and a boss portion 3a of a holder 3 that rotatably supports the rotary shaft 1 are inserted around the outer periphery of the rear shaft portion 1b of the rotary shaft 1, and a rotary shaft 1 is provided at the rear end of the rotary shaft 1. Handle 4 and center hole 1 for inserting a pencil
A lead stopper 5 that comes into contact with the end of the pencil to be inserted into the center and limits the insertion depth, and a lead diameter adjustment shaft 6 that abuts the front end surface of the lead stopper 5 to limit the retreat of the lead stopper 5. It is an integrated unit structure. This lead diameter adjusting mechanism part A is constructed by inserting the front shaft part 1a at one end in the axial direction of the rotating shaft 1 into the pencil insertion opening tube 7 provided on the front wall of the outer case B of the pencil sharpener, and also by inserting the holder 3
is fitted into the mounting hole 8 opened at the rear end of the outer case B, and engaged with a small protrusion 9 provided inside the mounting hole 8 to be attached to the rotation itself.

The center hole 10 has a pencil insertion hole 10a on the front shaft portion 1a side of the rotating shaft 1, a female screw hole 10b on the rear shaft portion 1b side, and a pencil insertion hole 10c therebetween. The stopper 5 is connected to the pencil insertion hole 1
It is in a suspended state at 0c and can freely move back and forth along the rotary cutting blade 2, abutting the inner step 10d at the forwardmost position and abutting and receiving the end surface of the tip 6a of the core diameter adjusting shaft 6 at the rear. The depth at which the pencil is inserted can be arbitrarily adjusted using the stopper piece 5a.

Next, the core diameter adjusting shaft 6 screws the male threaded part 6b into the female threaded hole 10b of the rotary shaft 1, and can freely move back and forth within the length range of this threaded hole 10b. Push the stopper 5 forward to sharpen the pencil lead by setting the lead insertion depth of the pencil lead insertion hole 10c to the shortest dimension, and on the other hand, at the maximum retracted position, set the lead insertion depth of the pencil lead insertion hole 10c to the maximum length. It is capable of retracting the core stopper 5 in a free state with a pencil lead and sharpening it into a fine lead.
This core diameter adjusting shaft 6 has a large-diameter cylindrical portion formed in the same body approximately in the middle of the length, and this has a male thread 6b on the outer peripheral surface.
Since the pitch is carved finely and accurately, fine adjustment can be made using the core diameter adjusting shaft 6.
In addition, a small-diameter recessed hole 11 is formed at the tip of the female screw hole 10b with which the male screw 6b engages, and an inner step 11a is provided at the border with the pencil lead insertion hole 10c. The front end of the coil spring 12 inserted into the inner outer circumferential surface of the coil spring 12 is received, and the rear end is received and attached to the inner end surface of the large diameter male threaded portion 6b of the core diameter adjustment shaft 6, so that the core diameter adjustment shaft 6 is always adjusted. The force is applied to the rear, that is, toward the rotating knob 6c, and the rear side of the thread of the male thread 6b of the core adjustment shaft 6 is brought into close contact with the front side of the thread of the female thread 10b of the rotating shaft 1, as shown in FIG. This prevents rotation between the male screw 6b and the female screw 10b due to the screw. In addition, an annular protrusion is formed on the outer periphery of the core diameter adjusting shaft 6 at the front side of the male threaded portion to lock one end of the spring 12 to the inner step portion 11a.
It can also be replaced by Furthermore, instead of this coil spring 12, it is also possible to convert it into a cylinder made of a rubber material.

In the drawing, reference numeral 13 denotes an internal gear provided in the holder 3, which meshes with the gear 2a of the rotary cutting blade 2.

As described above, in the present invention, a large diameter part is formed in the same body approximately in the middle of the core diameter adjusting shaft 6, and a male thread 6b is carved on the outer periphery of the large diameter part, so that the thread pitch can be formed accurately and easily, and fine adjustments can be made. can be done. Further, a small-diameter recessed hole 11 is formed in front of the female thread 10b that engages with the male thread 6b to form an inner step 11, and the front end of the coil spring 12 is received in this, and the rear end is connected to the large-diameter male thread 10b. Since it is in contact with and received by the inner end surface of the core diameter adjustment shaft 6, the core diameter adjustment shaft 6 is always urged in the backward direction to eliminate looseness at the threaded part of the male screw 6b and female screw 10b, and to prevent vibrations during cutting. It is possible to always form a core of a desired thickness uniformly without causing any inadvertent positional deviation from the set position of the core diameter, and the above-described fine adjustment of the core diameter can be performed more accurately and smoothly.

Furthermore, since the rear end of the coil spring is directly abutted against the inner end surface of the large diameter male thread 6b, no receiving parts or machining is required, reducing the number of steps required for machining the parts and assembly, and the object can be achieved with a simple configuration.

[Brief explanation of the drawing]

Figure 1 is a longitudinal cross-sectional view of the core diameter adjustment mechanism, Figure 2 is a longitudinal sectional view of the core diameter adjustment mechanism.
The figure shows an enlarged sectional view of a part of the screw fitting part. A... Lead diameter adjustment mechanism part, B... Outer case of pencil sharpener, 1... Rotating shaft, 2... Rotating sharpening blade, 3...
...Holder, 4... Rotating handle, 5... Core stopper, 6... Core diameter adjustment shaft, 6b... Male thread part, 10
...Center hole, 10a...Pencil insertion hole, 10b...
...Female screw hole, 12...Spring.

Claims (1)

[Scope of utility model registration request] The rotary sharpening blade 2 is fixed to the pencil insertion hole 10a of the rotary shaft 1 so as to create a cutting surface, and by operating the rotary handle 4 provided at the rear end of the rotary shaft 1, the rotary shaft 1 rotates and the inside is removed. In a pencil sharpener that cuts a pencil inserted into the pencil insertion hole 10a while the rotary sharpening blade 2 engaged with the contact gear 13 rotates on its own axis, the core stop contacts the insertion end of the pencil to limit the insertion depth. A large-diameter cylinder is formed approximately in the middle of a screw-type core diameter adjustment shaft 6 whose front end surface is in contact with the body 5, and this has a male thread 6b carved on its outer circumferential surface, and a female threaded hole in the rear shaft portion 1b of the rotating shaft 1. A small-diameter recessed hole 11 is formed in front of the spring 10b to provide an inner step 11a, and the front end of the spring 12 inserted into the core diameter adjusting shaft 6 is received in the inner step 11a, and the rear end is connected to the male screw. 6b
A screw for a pencil sharpener, which is received by the inner end surface of a large-diameter cylinder, and its elastic force causes the threads of the male screw 6b and female screw 10b to stick together to prevent the lead diameter adjustment shaft 6 from rotating due to vibration. Type core diameter adjustment device.