JPS5831317B2 - rotary writing instrument - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary writing instrument in which the main body is rotated to extrude the lead while rotating it by an appropriate amount.

Recently, most mechanical pencils use a knock type, but the knock type has the following drawbacks.

That is, in the knock type, the lead is held by a chuck, but in order to securely hold the lead, the chuck part is designed to bite into the lead to some extent, and as a result, the lead is likely to break.

In addition, the amount pushed out with each knock is fixed and cannot be adjusted, and since the lead does not rotate, it wears unevenly during writing, and it is necessary to hold the main body again and rotate it.

Rotary writing instruments have also been proposed, but with conventional ones, the leads are inserted one by one into the lead holding pipe from the tip, so when the lead becomes shorter, a new lead is inserted from the tip each time. It is very inconvenient to use,
The structure was also complex.

This invention was made to solve these drawbacks, and has a simple structure that prevents core breakage, allows the amount of core extrusion to be adjusted arbitrarily, and eliminates the need to replace the core when it wears out. The purpose is to provide a writing instrument that is not available in the market.

Hereinafter, the present invention will be explained with reference to drawings of embodiments.

In FIGS. 1 and 2, 1 is a front main body, 2 is a rear main body, and 3 is a tapered tip member, and a core pipe 8 is inserted into the main bodies 1 and 2.

The outer circumferential portion of the core pipe 8 is knurled at the portion to be inserted into the rear body 2 to form a fitting portion 9, and a retaining protrusion 16 is formed at the portion to be inserted into the front body 1. By attaching a retaining ring 11 to this portion and inserting it into the front body 1, the core pipe 8 is rotatably attached to the front body 1.

The fitting portion 9 of the core pipe 8 is fitted into the rear body whose inner peripheral surface is knurled, so that the rear body 2 and the core pipe 8 are coupled together so as not to rotate relative to each other.

6 is a rotary mechanism, the rear end of which is fitted into the tip of the core pipe 8 and rotates together with the core pipe 8; a core hole 61 through which only one core passes is formed at the center of the shaft; The rear part of the core hole expands into a trumpet shape and communicates with the core storage section 80.

A core hole 6 is formed around the core hole 61 on the outer periphery of the rotary mechanism 6.
Three rolls 7 are arranged rotatably through the rolls 7 at a constant inclination angle with respect to the direction of the front body 1, and the outer circumferential surfaces of both ends of the rolls 7 are exposed so as to contact the inner surface of the front body 1, and the center of the rolls 7 The portion is arranged so as to come into contact with the core 20 within the core hole 61.

In the above embodiment, a core pipe for storing a plurality of spare cores is connected to the rear part of the rotary mechanism 6, and this is inserted into the rear body 2. However, various modifications may be made to this configuration. For example, it is possible to expose the core pipe 8 from the rear end of the rear body, or to form the core pipe and the rear body integrally, or to extend the rear part of the rotary mechanism and connect the rotary mechanism behind the front body. It may be configured so that it can be rotated.

A slide pipe 4 is installed inside the tapered tip member 3, and a lead holding member 13 that provides an appropriate amount of movement resistance when the lead moves is fitted into the tip of the slide pipe 4.
The pipe itself can be moved by a fixed amount in the axial direction by a stopper 5.

Note that this pipe may be fixed, or the core hole may be formed directly in the tapered tip member without providing the pipe.

Reference numeral 15 denotes an eraser, which also serves as a lid for a lead storage section 80 into which a plurality of spare leads are inserted.

Next, the function of this writing instrument will be explained.

When a plurality of cores are placed in the core storage section 80, one of the cores is passed through the core hole 61 by its own weight.

Then, when the rear body 2 is rotated relative to the front body 1,
The core pipe 8 connected at the fitting part 9 also rotates, rotating the rotary mechanism 6 connected to its tip.

When the rotary mechanism 6 rotates within the front body 1, the roll 7
The rolls 7 are rotated because both ends thereof are in contact with the inner surface of the front body 1, and each roll 7 is in contact with the core 20 at its center as shown in FIGS. A rotational force is applied to the core while holding it, and since the roll 7 and the core 20 have a constant inclination angle, the core 20 is rotated and moved in the axial direction.

The amount of this movement is determined by the inclination angle α of both and the diameter of the core, and it moves by a for one rotation of the core.

When the rear main body 2 is rotated in this way, the core pipe 8 and the rotary mechanism 6 are also rotated, and the roll 7 revolves around the revolution and also rotates by being in contact with the inner surface of the front main body 1.

Then, the core 20 is rotated and moved by the rotation of the roll 7, and is caused to pass through the slide pipe 4 and project to the tip.

Therefore, the core 20 moves in proportion to the amount of rotation of the rear main body 1,
The amount of core extrusion can be freely and steplessly adjusted by changing the amount of rotation.

In response to pen pressure during writing, the roll 7 presses the lead 20 from the outer periphery, thereby fixing the lead 20.

In this way, with this structure, the lead is held by a smooth cylindrical surface, and unlike the conventional chuck type, the lead is not scratched, thereby eliminating the drawback of the lead breaking due to the holding part.

In addition, if the lead is worn out by writing, the rear main body 2 is rotated to make the lead protrude by an appropriate amount, but since the lead remover rotates according to the amount of protrusion, uneven wear caused by wear and tear on the lead is avoided. There is no need to rotate the main body to change the grip.

When the core becomes short due to use and the rear end of the core passes through the rolls 7, the spare core in the core pipe 8 is fed into the core hole 61, held by the rolls 7, and fed. Push out the shortened wick.

Therefore, unlike conventional rotary writing instruments, there is no need to replace the lead each time the lead becomes shorter.

Note that the number of rolls 7 for holding and feeding the core does not necessarily have to be three; for example, as shown in FIG. It is also possible to hold and feed the book by pressing it with the roll 7 of the book.

In this case, the operation and effect are the same as in the above case, and the roll 7 contacts the inner surface of the main body 1 at both ends and rotates, and this rotational force contacts the core 7 at the center of the roll 7. It is transmitted to the core by the core 20, and the core 20 is transferred in the axial direction while rotating.

As explained above, this invention uses a rotary mechanism to rotate and send out the core,
With a simple structure, the amount of protrusion of the lead can be set freely.Since the lead rotates and is fed out, there is no need to change the lead as it wears out.Also, since the lead is held without damaging it, the lead does not break. <<Furthermore, unlike the conventional rotary type, the spare cores are sent out one after another, so there is no need to replace the cores one by one.

[Brief Description of the Drawings] Fig. 1 is a longitudinal sectional view showing an embodiment of the present invention, Fig. 2 is an exploded perspective view thereof, Fig. 3 is a perspective view of only the core holding part, and Fig. 4 is a side view thereof. , Fig. 5 is a sectional view taken along the line ■-v in Fig. 4, Fig. 6
The figure is a cross-sectional view showing another embodiment of the rotary mechanism. 1...Front body, 2...Rear body, 6
......Rotary mechanism, 7...Roll, 8...Core pipe, 9...Fitting part, 20...Core,
61... Core hole.

Claims (1)

[Claims] 1. It has a tapered tip member, a front body connected thereto, and a rotary mechanism rotatably inserted into the front body, and the rotary mechanism has a core hole through which the core passes one by one. At the same time, at least one columnar roller is inserted into the core hole at a constant angle of inclination, and the roller is mounted so that both ends of the roller are in contact with the inner surface of the front body and the center part is in contact with the core, and the rotary mechanism is moved forward. The rotary mechanism is rotated by rotating the front body from the rear, and the columnar roller contacts the inner surface of the front body and rotates, thereby rotating and sending out the core in the core hole. Rotary writing instrument.