KR900003811Y1 - Sharp pencil - Google Patents

Abstract

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Description

Shaaf Pencil

1 is a longitudinal sectional view of a mechanical pencil according to a first embodiment of the present invention.

2 is a partial longitudinal sectional view showing the operating state of FIG.

3 is a sectional view showing main parts of a second embodiment of the present invention.

4 is a longitudinal sectional view of a mechanical pencil according to a third embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

1: outer cylinder 2: tip cap

3: slider 4: slave

5: stroke delivery mechanism 7: friction imparting member

8: first spring 9: tofu cap

10: weight 51: lead chuck

56: second spring S: core

The present invention relates to a mechanical pencil is to be sent out automatically when the writing stops.

BACKGROUND ART Conventional mechanical pencils include a pen core pipe having a lead core inserted to slide reciprocally in an outer cylinder having a tip cap, and a lead chuck disposed at the front end of the pen core pipe. A slider disposed at the front end and a friction imparting member fitted to the slider are provided, and when the rear end of the peeled pipe is knocked, the peeled delivery mechanism is operated so that the peeled heart is sent out.

By the way, the conventional pencil pencil is to be sent out only by knock operation, for example, when writing is finished during the writing, you need to fix the writing instruments and knock the back end of the lead pipe with your finger every time. There was a problem that the operation was always cumbersome.

Therefore, the present invention was devised to solve the above problems, and when writing is stopped without the need for knock operation, the writing pressure is automatically released as well as writing instruments when the writing is worn out. Its purpose is to provide a mechanical pencil that can be made smoothly by simply shaking the outer cylinder without fixing the pen.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a longitudinal sectional view of a mechanical pencil according to the first embodiment of the present invention, which includes a tip cap 2 fitted to the front end of the outer cylinder 1 so as to be detachable by means such as screwing, etc. Slider (3) is inserted into the cap (2) for sliding reciprocating movement, the sleeve (4) interposed in the tip cap (2) for sliding reciprocating movement, and this slide ( 4) a pen delivery mechanism 5 fitted therein is provided.

The front cap 2 is integrally formed with a rear cylindrical portion 21 fitted into the outer cylinder 1 while a pair of sliding grooves 22 are formed at a symmetrical position of the rear cylindrical portion 21. These sliding grooves 22 are fitted with a pair of locking projections 41 formed to protrude in a symmetrical position on the outer circumferential surface of the front end of the sleeve 4 so that the sliding reciprocation can be freely moved.

As such, the sleeve 4 which is arranged to be slidably reciprocated in the rear cylindrical portion 21 of the tip cap 2 has a weight movement in the axial direction when the outer cylinder 1 is shaken. By doing so, the pen core sending mechanism 5 sends a pen core S.

For this reason, the slab 4, which is a heavy weight portion, includes a protrusion bar 42 connected to its front end, or a weight of which one of the protrusion bar 42 and the sleeve 4 is made of metal or the like. It is formed by a member.

In addition, the protrusion bar 42 has a rear large diameter cylindrical portion 43 integrally formed at the rear end thereof to be fitted to the front end of the sleeve 4, where the front end of the sliding groove 1 (22) and In the state shown in Example 1 between the front end of the engaging projection 41, a clearance interval a is provided, and this distance a moves forward and backward in accordance with the weighting action of the sleeve 4. It becomes the allowable range.

In addition, the protrusion bar 42 is fitted inside the rear of the slider 3 so as to slide reciprocally in the axial direction, and the slider 3 has a slide pipe 30 to be integrally formed at the front end thereof. The outer staircase 31 of the slide pipe 30 is caught by the inner staircase 23 in the forward direction of the tip cap 2 so that further forward movement is restricted.

Inside the slider 3, a non-directional bilaterally symmetrical frictional imparting member 7 is inserted into the core S, where the frictional imparting member 7 is a slider 3. It may be considered that the integral formation can be considered, so that only a predetermined friction force may be applied to the lead S.

Here, the lead chuck 51 provided with the lead delivery mechanism 5 has the force that the slider 3 advances in the state where the frictional imparting member 7 is caught by the friction core S with friction force. It is set larger than the force to be grabbed.

In addition, the frictional force that the friction imparting member (7) bites the pen core (S) is a forward friction force and a retraction friction force for the pen core (S), the forward friction force is greater than the force that the lead chuck 51 bites the pen core The retraction frictional force is set smaller than the force that the lead chuck 51 holds the core.

Therefore, when the slider 3 moves forward, the lead chuck 51 holding the lead S from the back while the frictional imparting member 7 holds the lead S with its forward frictional force is caught. The lead chuck 51 is advanced together to a release position, and when the slider 3 is retracted, the lead chuck 51 is simply retracted without catching the lead S.

In this way, the frictional imparting member 7 not only firmly grabs the pen core S when the slider 3 is moved forward, and smoothly discharges it, and also bites the pen core S when the slider 3 is retracted. In this case, it is possible to reliably withdraw the lead S from the lead chuck 51 in any case, such as during the weighting operation by the sleeve 4 or the automatic stroke sending operation described in detail later.

The sleeve 4 is pushed in the retraction direction by the first spring 8 mounted between the front end of the rear large diameter cylindrical portion 43 and the rear end of the inward stairway portion 61, and the retraction position thereof. As the locking protrusion 41 is engaged with the rear end of the sliding groove 1 (22), the retreat direction movement of the sleeve 4 is restricted.

In this state, a constant distance b is provided between the rearward inner staircase 24 of the tip cap 2 and the front end of the rear large diameter cylindrical portion 43, which distance b is described later. This is the distance corresponding to the amount of strokes that will be sent out automatically when you stop writing.

On the other hand, the rear end of the outer cylinder (1) is fitted so that the head cap (9) is detachable in advance, the head cap (9) is integrally formed in the outer cylinder (1) as shown in FIG. The head cap 9 is provided with a lead introduction pipe 91 formed integrally with the shaft center.

And the front end of the lead pipe 91 is close to the inside of the rear end of the sleeve 4, the rear end is in communication with the lead lead opening 92 opened at the outer end shaft center of the head cap (9) However, the lead lead inlet 92 and the lead lead pipe 19 are formed with a diameter into which only one lead can be inserted.

Therefore, in the present pencil shaft, only one lead S is inserted from the lead lead inlet 92 through the lead lead pipe 91, and thus the lead lead S is used as the lead lead inlet 92. With a length equal to the total length of the mechanical pencil, provided that the tip thereof is at least such that the leading end reaches at least the grip position by the pen delivery mechanism (5). It may be anything.

Moreover, the pen core feeding mechanism 5 mounted in the sleeve 4 is supported by the lead chuck 51 divided into two along the axis and the retaining portion 52 of the head of the lead chuck 51. Bowl 53, a metal barrel 54 is inserted into the front end of the sleeve (4) as needed to support the bowl (53) in a rotational contact state between the bowl support portion 52 and the, A second spring 56 for tightening the chuck mounted between the inner wall staircase 45 of the sleeve 4 and the outer engaging staircase 55 of the lead chuck 51 is provided. 5) is configured to allow the forward (S) but prevent the retreat.

The other detailed configuration of the pen delivery mechanism 5 is described in detail in Japanese Patent Application No. 62-94905 filed by the present applicant in Japan.

Herein, the elastic modulus of the second spring 56 is, for example, 8 to 10 g, which is set to be larger than 6 g, which is the elastic modulus of the first spring 8.

Next, the core delivery operation of the present invention will be described.

The handwriting transmission operation according to the present invention is made through the following two means, the first of which is to send the heartwriting automatically when the writing stops.

That is, writing is usually performed in a state in which the pen core S protrudes by the amount of correction X from the front end of the slider 3, as shown in FIG. 1, and the pen core S gradually wears off as the writing proceeds. When the front end of the lead (S) and the front end of the slider (3) is in a state of being in a planar state, even in this state, the slider (3) can be retracted against the pushing force of the first spring (8) It will be retracted to the distance b shown in 1 degree.

However, in order to achieve the wear amount due to the writing (S) as much as the retraction distance (b), the writing must be performed for a very long time. When writing a Chinese character, the wear amount of the lead (S) is only about 0.01mm.

Therefore, it is conceivable that the writing is not continued until the slider 3 is retracted by the distance b, and the writing is always stopped or the writing is stopped.

In addition, if the slide pipe 30 protrudes from the tip cap 2 to a distance b or less, it is possible to ensure automatic delivery of the core.

Thus, for example, when writing is stopped in the state shown in FIG. 2 and the front end of the slider 3 is displaced from the ground, the slider 3 is advanced by the elastic force of the first spring 8 and the pendulum S Is also attracted in the forward direction together with the slider 3 by a predetermined frictional force from the frictional imparting member 7).

On the other hand, since the lead chuck 51 also holds the lead S, it moves forward with the lead S. In this case, the lead chuck 51 moves forward a little while the lead lead S releases the bite. I will let you.

That is, when the lead chuck 51 is advanced, the lid 53 of the head cap moves forward as described above because the inner surface of the metal cylinder 54 contacts the tapered wall 54a with the lead chuck 51. The force to hold this pen will weaken the sending of the pen (S).

By this series of operations, the state is returned to the state shown in FIG. 1, and the automatic hand-delivering operation is performed so that the handwriting can be performed and the handwriting can be continuously performed up to the retreat distance b of the slider 3 as much as possible.

As a next second means, the outer cylinder 1 is shaken to send the lead.

First, shake the outer cylinder 1 in the state where the pen core S is inserted from the pen core introduction port 92 of the head cap 9 to the pen core grip position of the lead chuck 51 through the pen core introduction pipe 91. When the sleeve 4 is moved, the weight 4 moves forward against the first spring 8. Thus, when the sleeve 4 moves forward, the sleeve S in the sleeve 4 is moved. The lead S is advanced together with the lead chuck 51 holding the lead, so that the lead S is caught by the friction applying member 7.

As the weight 4 of the sleeve 4 moves forward and backward, the lead S is sent out from the front end of the slider 3.

That is, as described above, the frictional imparting member 7 which grips the pen core S permits the forward movement of the pen core S but prevents the retraction, while the lead chuck 51 of the pen core S is retracted when retracting. Since the lead chuck 51 releases the noise, the lead chuck 51 bites the lead S when it moves forward according to the weight movement of the sleeve 4, and the friction applying member 7 when it retracts. The captured pen (S) is left behind.

Therefore, as described above, since the sleeve 4 is repeatedly moved forward and backward by the weighting operation, the pen core transmission is made.

4 shows another embodiment, in this embodiment, the weight 10 is loosely inserted in the pen core introduction pipe 91 integrated with the head cap 9 so as to slide freely in a reciprocating manner. The head cap 9 is fitted to the inside of the rear end of the outer cylinder (1).

In this embodiment, when the outer cylinder (1) is shaken, the weight (10) is weighted axially along the guiding pipe (91), and when the weight (10) moves forward according to this weight, the weight (10) The sleeve 4 is moved forward by lowering the rear end of (4), and the lead delivery mechanism 5 is moved forward by the lead delivery mechanism 5 as in the previous embodiment.

As described above, according to the present invention, the pen pressure is automatically released when the pen pressure is released by stopping the writing without the need for the end knock, and also the pen is sent out in accordance with the weight movement of the internal mechanism by shaking the outer cylinder. It is effective.

Claims (3)

A sleeve 4 disposed so as to slide freely in the tip cap 2 of the outer cylinder 1, and a pen core feeding mechanism fitted in the sleeve 4 to allow the advance of the pen core S and to prevent retreat; 5) a slider (3), which is arranged to slide in the tip cap (2) and has a friction imparting member (7) to impart a predetermined frictional force to the pen core (S) therein; The first spring 8 to advance the slider 3 so that the pendulum S is automatically sent out when the writing is stopped by pushing forward) and the back of the outer cylinder 1 as an integral or separate body. The pencil pencil is provided with a lead lead pipe 91 which is installed to guide one lead core (S) from the outside to the pen core sending mechanism (5). Shake according to claim 1, characterized in that when the outer cylinder (1) is shaken, the pendulum delivery mechanism (5) is advanced together with the sleeve (4) so that a weight portion for discharging the pen core is installed at a predetermined position. Pencil. According to claim 1, wherein the lead pipe (91) is disposed on the rear end of the sleeve (4) is to lower the rear end of the sleeve (4) by the weighting action according to the shaking motion of the outer cylinder (1) The pencil pencil is characterized in that the weight (1) is loosely fitted so as to slide back and forth in the axial direction.