KR900009023Y1 - Sharp pencil - Google Patents

Abstract

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Description

Shaaf Pencil

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

2 is a sectional view taken along line A-A of FIG.

3 is an explanatory perspective view of a rotating cam mechanism.

4 is a sectional view taken along line B-B of FIG.

5 is an explanatory view of the cam.

6 is a cross-sectional view taken along line C-C of FIG.

7 is a longitudinal sectional view showing the second connecting means of the cam and the driver;

8 is a cam side view.

Fig. 9A is a cross-sectional view of the line segment D-D of Fig. 8, and Fig. 9B is a cross-sectional view of the line segment E-E of Fig. 9A.

10 is a plan view of the driver.

11A is a cross-sectional view taken along line F-F of FIG. 10, and FIG. 11B is a cross-sectional view taken along line G-G of FIG.

12 is a longitudinal sectional view showing a third connecting means.

14 is a side view of the cam.

15 is a longitudinal sectional view showing a fourth connecting means.

16 is a perspective view of a driver.

17 is a side view of the cam.

18 is a longitudinal sectional view showing a fifth connecting means.

19 is a cross-sectional view taken along line H-H of FIG.

20 is a perspective view of the press-fit locking member.

21 is a longitudinal sectional view showing a sixth connecting means.

FIG. 22 is a cross-sectional view of the segment I-I of FIG. 21. FIG.

23 is a perspective view of a sixth connecting means.

24 is a cross-sectional view of a seventh connecting means.

25 is a front view of the elastic opening and closing portion.

* Explanation of symbols for main parts of the drawings

1: outer cylinder 1a: front outer cylinder

1b: rear outer tube 6: pen delivery mechanism

9: rotating cam mechanism 18: screwdriver

20: cam

The present invention relates to an improvement of a mechanical pencil, which is designed to send a pen core through a cam barrel when the rear outer cylinder is rotated, and particularly relates to a mechanical pencil that can be efficiently assembled.

In the conventional rotary mechanical pencil, the rear outer cylinder is rotatably connected to the rear of the front outer cylinder in which the pen core pipe having the pen core feeding mechanism is inserted at its tip, so that the rear outer cylinder can be rotated freely. As the pipe was rotated, the lead was made to be sent out.

That is, the projections to move along the spiral groove formed in the outer cylinder in the lead pipe containing the lead core is formed so that when the rear outer cylinder is rotated, the lead pipe is rotated to move forward or retreat.

In the conventional rotary mechanical pencil, since it is a rotary protrusion type, only one lead can be made to the lead pipe, so it is necessary to replenish the lead frequently, and the lead is thin (0.3mm, 0.5mm). When you replenish your penmanship, the penmanship was broken. Moreover, the conventional rotary mechanical pencil as described above has a problem that the internal structure is complicated and the number of parts increases, making the manufacturing cost expensive as well as difficulty in assembling and disassembling.

In this regard, the present invention is designed to solve the above problems, and it is possible to store more of the lead in the lead core pipe by the rotary knock type, and the lead does not break when replenishing the lead. It is also an object of the present invention to provide a mechanical pencil in which the number of parts is so small that the manufacturing cost is reduced and the efficiency in assembling work is dramatically improved.

The mechanical pencil of the present invention for achieving the above object is to be able to assemble the parts arranged in the outer cylinder such as the pen core feeding mechanism from the back of the outer cylinder separately, so that the parts such as the pen core feeding mechanism can be assembled. Just insert it into the inside of the outer cylinder from the back, and the assembly is made.

Hereinafter, an embodiment according to the present invention will be described in detail with reference to the drawings.

In the mechanical pencil shown in FIG. 1, the outer cylinder 1 is composed of a rear outer cylinder 1b connected to the front outer cylinder 1a so as to be able to rotate freely with respect to the front outer cylinder 1a. When the outer cylinder 1b is rotated, as described later, an operation of discharging the pen core 2, an operation of moving the slider 3 forward, and opening the lead chuck 4 to open the slider ( 3) It will be a storage operation.

And the inside of the outer cylinder (1), the barrel adapter (5, barrel adapter), which is press-fitted and fixed to it, the pen core pipe (8) and the rotary cam mechanism (9) provided with the pen core sending mechanism (6), opening and closing mechanism (7) Is equipped.

Here, the pen core delivery mechanism 6 is disposed in the mechanism adapter 10 so as to slide in the mechanism adapter 10 and the mechanism adapter 10 fixed to the barrel adapter 5 so as not to rotate, and the protrusion 11a. Cassette adapter 11 (see Figs. 1 and 3), which is adapted to slide in a axial groove 10a formed forward from the rear end of the mechanism adapter 10, the cassette adapter 11 Lead chuck (4) fitted at the front end of the head), the chuck ring (12) inserted while covering the head of the lead chuck (4), and abutting the rear part of the chuck ring (12) in the mechanism adapter (10) A sleeve 13 arranged to be slidable, a cushioning first spring 14 mounted between the sleeve 13 and the step portion 10b of the mechanism adapter 10, and the sleeve 13 And second springs 15 for chucking mounted between and cassette adapter 11 Equipped.

And the front end of the mechanism adapter 10 is fitted so that the tip cap (16A) can be freely detachable, the rear end is fitted with a cylindrical upper housing (16).

In the tip cap 16A, the slider 3 is arranged to be slidable. As for the slider 3, a Japanese utility model registration application filed by the applicant of the utility model registration application in Japan. 114277 et al.

The slider 3 is composed of a lead guide 3a and a slider member 3b fixed to the rear end of the lead guide 3a and supporting the lead 2 with a constant frictional resistance on its inner circumferential surface.

In addition, the tip guide friction portion 17, in which the lead guide 3a slides in contact with the frictional force greater than that of the slider member 3b, is fixed to the inner wall of the tip end portion 16A. 3b) is integrally formed of a material such as ABS resin or polyacetyl.

As shown in FIGS. 1 and 3, the rotary cam mechanism 9 is firmly connected and fixed to the driver 18 so that the cam surface 19 is inserted into the upper housing 16. 20 and a cam bearing 21 and an active member 22a which is in contact with the cam surface 19 of the cam 20, are slid in the axial direction in accordance with the rotation of the cam 20, so Cam follower member 22 for achieving a pen core feeding operation or the like.

Here, a third spring 23 for restoring is mounted between the cam follower 22 and the mechanism adapter 10 so that the actuator 22a of the cam follower 22 is always pressed against the rear cam surface to be brought into contact with the cam follower. This prevents the 22 from rotating in the axial rotation direction.

In addition, at the distal end of the cam follower member 22, an adapter hole 22b is formed to receive and engage the slide adapter in the axial direction for the rear end of the cassette adapter 11.

The adapter hole 22b is engaged with the rotation stopper 11c of the cassette adapter 11, as shown in FIGS. 1, 3, and 4, and the cassette adapter 11 rotates in the axial rotation direction. The adapter rotation preventing groove 21c is formed in the axial direction so as to restrict the rotation and to rotate integrally with the cam 20.

Here, the distance a between the rear end of the cassette adapter 11 and the inner wall stairway portion 22d of the cam follower member 22 during the first period becomes the cushion distance, i.e., as described later, it is excessive to the core 2. When the writing pressure is applied, the lead chuck 4 and the cassette adapter 11 and the like become a retraction allowance as a space (retraction allowance) for allowing the retraction movement.

Next, the structures of the cam face 19 of the cam 20 and the actuator 22a of the cam follower member 22 will be described with reference to FIGS. 3 and 5.

The actor 22a has a stopper face 22a1 along the lateral direction for regulating the rotation of the cam 20 in one direction. On the other hand, the cam 19 has a knock cam surface region Z for carrying out forward movement and pen core delivery operation of the open cam surface region Y and the slider 3 for opening the lead chuck 4 around the X point. ) Here, the state where the X point and the activator 22a are positioned is normal when writing and not using a writing instrument, or a pen sending operation, a slider 3 moving operation, and a lead chuck 4 opening operation. Is with.

On the other hand, the open cam surface region Y is an open curved cam surface 19a1 extending in a curved shape from one point X to an active curved stop portion 19a2 and an active member 22a at the end of the open curved cam surface 19a1. It consists of an open stopper surface 19a3 which is in contact with the stopper surface 22a.

Here, if the cam 20 is rotated in the direction of arrow (a) shown in FIG. 3, the actor 22a moves the curved cam surface 19a1 in the direction of arrow (b) shown in FIG. As a result, the lead chuck 4 is gradually opened, and the position of the lead chuck 4 is fastened when the slider 3 can be accommodated. Meanwhile, as shown in FIG. 5, the knock cam surface area Z has a knock curved cam surface 19b1 extending from the X point to the other direction, and the knock curved cam surface 19b1 transmits a pen core and a slider. The cam surface has a dual function to move (3) forward. That is, when the cam 20 is rotated in the direction of the arrow (c) of FIG. 3, the active member 22a is placed on the knock curved cam surface 19b1. As shown by the arrow (d) in FIG., The cam follower 22, the cassette adapter 11, the lead chuck 4, such as the lead chuck 4, and the like move forward. Here, if the cam 20 rotates less (in case of a slight knock), only the pen core feeding operation is performed, and when the cam 20 rotates a lot (when the knock is large), the pen core feeding mechanism 6 is further advanced again. As a result, the slider 3 is pressed together with the heart-feeding operation to move forward.

The cam 20 has a driver 18 for fixing the rear outer cylinder 1b to be fixed by various means, and reference numeral 24 denotes a driver bearing in FIGS. 1 and 3.

1 and 6 show a first connection fixing means for connecting the cam 20 and the driver 18. In this embodiment, the step portion for engaging the driver on the outer circumferential surface of the cam rod 20a of the cam 20. 20b and the rotation stop groove 20c are formed.

On the other hand, the fitting portion 18a of the driver 18 has a substantially cylindrical shape that is enclosed from the outside of the cam rod 20a so that the inner staircase portion 18b is further inside the locking staircase 20b. The direction projection pieces 18c are engaged with the rotation stop grooves 20c, respectively, so that the two are firmly fitted.

3 and 7 to 11 show a second connecting means. In this embodiment, the locking projection piece protrudes outwardly from the rotary stop groove 20c on the cam rod 20a so that it can be heard in the radial direction. 20d is formed. On the other hand, in the fitting portion 18a of the substantially cylindrical driver 18, the inwardly projecting piece 18c engaged with the rotation stop groove 20c and the locking piece 20d can be pressed into the fitting portion 18a. The recessed part 18d is formed, and the said fitting part 18a is pressed by the cam rod 20a, and both are firmly fitted.

Then, when the cam 20 is inserted into the upper housing 16 from the direction of arrow (e) in FIG. 7 and the locking protrusion 20d of the cam rod 20a passes through the driver bearing 24, the locking protrusion 20d is removed. It protrudes in the radial direction and is formed so that it may not come out from the driver bearing 24.

Further, as shown in FIG. 3, a wedge or the like may be pressed into the groove 20d ₁ of the locking projection piece 20d so as to secure a more protruding position. The driver bearing 24 may be omitted as shown in FIG.

12 to 14 show a third connecting means, which are formed with a plurality of inward staircases 18e in the fitting portion 18a of the driver 18 to the cam rods 20a of the cam 20. It is fitted into the bent groove (20e) formed is twisted to fit.

15 to 17 show a fourth connecting means, in which a protrusion 20f is formed on the cam rod 20a of the cam 20 so that the bent groove 18f of the fitting portion 18a of the driver 18 is shown. And then twisted into place.

18 to 20 show the fifth connecting means, which presses the fitting portion 18a of the driver 18 against the cam rod 20a, and the insertion grooves 18g and 20g are formed in both of them. It is made.

Then, the cam rods 20a and the fitting members 18a are firmly fitted by pressing the press-fitting member 25 that both the insertion grooves 18g and 20g coincide with each other, thereby generating a force to push in the lateral direction. It is made. Here, the press-fit catching member 25 may have any shape as long as it can generate a pressing force in the lateral direction in which the cam rod 20a and the fitting portion 18a are fitted. For example, the 20a to 20c An example may be shown in the figure.

In this embodiment, the press-fit locking member 25 is pressed into two places, but it may be made to be one or three or more places.

21 and 23 show a sixth connecting means, which is a stop cylinder 26 shaped like an approximately 3/4 arc outside the fitting portion 18a of the driver 18 pressed against the cam rod 20a. ) Is inserted. The stop outer cylinder 26 has a bent portion 26a that is bent inwardly so that the bent portion 26a is inserted into the insertion grooves 18b and 20b of the driver 18 and the cam rod 20a. The fitting portion 18a is provided with a compressive force in a direction to reduce the diameter so that the fitted state is firm.

24 shows a seventh connecting means, which, like the sixth connecting means described above, firmly fits the fitting portion 18a and the cam rod 20a of the driver 18 to the stop cylinder 26. The difference between this and the stop cylinder of the sixth connecting means is that the bent portions 26a and 26a bent at both ends are inserted into the insertion grooves 18b and 20b while the shape becomes approximately semicircular. That's all.

As the fill pipe 8, in the present embodiment, a so-called cassette type fitted to the cassette adapter 11 to be detachably freely used is used, and the opening and closing mechanism 7 is detachable at the rear end at the front end thereof. The rubber 27 is attached.

Meanwhile, as shown in FIG. 1, the opening / closing mechanism 7 includes an end plug 28 mounted to be detachably attached to the front end of the fill pipe 8, and an elastic opening and closing fitting fitted to the end plug 28. 29).

As shown in FIG. 1, a pipe 30 which opens the elastic opening and closing portion 29 when fitting the lead pipe 8 into the cassette adapter 11 is fitted to the cassette adapter 11.

Here, the elastic opening and closing portion 29 is such that the core 2 can not conduct the groove 29a before the cassette adapter 11 is inserted, but after it is fitted, The groove 29a is not allowed to conduct as shown by the solid line in FIG. 1, but once inserted, the groove 29a is pushed and widened as shown by the solid line in FIG. This can be conducted.

The front and rear outer cylinders 1a and 1b are formed in the same size as the outer diameter of the mechanism adapter 10, the upper housing 16, the driver 18, and the like so that they can be assembled from the rear side.

Next, the assembly of the subject innovation mechanical pencil configured as described above will be described.

First, the cam bearing 21, the cam 20, and the cam follower member 22 are inserted from the front end of the upper housing 16, and then the third spring body 23 and the pen core feeding mechanism 6 unitized in advance. Insert the cassette adapter 11) from the front end of the upper housing 16 as above. Then, the tip caulking portion 18i of the driver 18 is fixed to the mechanism adapter 10.

On the other hand, the cam 20 inserted into the upper housing 16 protrudes the cam rod 20a to the rear. The cam rod 20a is described above with the driver 18 via the driver bearing 24. It is fixed by the fixed means. In addition, the rear outer cylinder 1b is press-fitted and fixed to the driver 18.

In this way, the pen core feeding mechanism 6, the rotary cam mechanism 9, the pen core pipe 8, and the rear outer cylinder 1b are inserted from the rear of the front outer cylinder 1a, respectively. In this case, the mechanism adapter 10 ) And the cassette adapter 11 and the like are easily inserted because the diameter is smaller than the front outer cylinder 1a.

Then, when the tip 16A is fitted to the tip 10j of the mechanism adapter 10, the assembly is completed.

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

The state shown in FIG. 1 is a state in which the slider 3 is fastened and stored. At this time, the actuator 22a of the cam follower member 22 is positioned at the actuator engaging portion 19a2 of FIG. In this state, when the rear outer cylinder 1b is rotated in the direction of the arrow (c) in FIG. 3, the rear outer cylinder 1b and the cam 20 rotate integrally, so that the active member 22a is relatively cam surface 19. The image is moved in the direction of arrows (f, g) in FIG. 5 to advance from the open cam surface region Y to the knock cam surface region Z.

As a result, the pen delivery mechanism 6 is also advanced, and in the process of advancing, the pen delivery operation is performed, and the larger end of the lead chuck 4 pushes the slider 3 forward. When the lead guide 3a is advanced to the dashed-dotted line position of FIG. When the hand is released from the rear outer cylinder 1b, the rotating cam mechanism 9 is pushed backward by the return third spring body 23 so that the active member 22a is moved back on the cam surface 19, It stops at the X point position, and it becomes possible to write in this state. When the core 2 is worn out, the rear outer cylinder 1b may be rotated a little in the direction of arrow (a) of FIG. 3 to perform the core discharging operation.

Also, since the slider 3 is in a position where the lead guide 3a protrudes from the tip cap 16A, when the lead guide 3a is pressed against the ground or the like in this state, the lead guide 3a and the lead ( 2) A part of the lead delivery mechanism 6, such as the lead chuck 4 and the sleeve 13, held in place, is retracted inward by the second spring body 14 for cushioning compressed by the pressed force. Will move.

Subsequently, when the compression force applied to the lead guide 3a is released, the lead guide 3a is stopped by the lead guide ejection or not 17, but the lead lead 2 caught by the lead delivery mechanism 6 is stopped. ) Is returned to its original position along with the pen core delivery mechanism 6 by the elastic force of the second spring 14, so that writing can be made such that the pen core protrudes from the front end of the pen guide 3a.

In this way, while the pen core 2 as much as the movable area of the pen lead guide 3a is consumed, no pen lead transmission by knock operation is required, and accordingly, the pencil can be changed without changing the mechanical pencil. do.

When the rear outer cylinder 1b is rotated and the knock operation is performed to return the slider 3 to the moving tip position, the front end of the lead chuck 4 pushes the slider 3 forward to move to the moving tip position. do.

Then, when the writing is finished, the end state may be left as it is, but the slider 3 stored in the tip cap 16A1 may prevent the core 2 from being broken or damaged. Thus, when the rear outer cylinder 1b is rotated in the direction of arrow (a) of FIG. 3, the actuator 22a moves relatively from the X point of the cam surface 19 to the open cam surface region Y to open the stopper surface 19al. Will come to a stop.

Since the end of the activator 22a is caught by the activator engaging portion 19a2 in this position, the position of the activator 22a is maintained against the force of the return third spring body 23 even after leaving the rear outer cylinder. In this state, since the lead chuck 4 is in an open state, when the tip of the lead guide 3a is pressed against the ground or the like, the slider 3 enters the tip cap 16A together with the lead core 2 to be stored. As a result, it is returned to the same state as the first degree.

Thus, according to this invention, since the diameter which the parts arrange | positioned in an outer cylinder can be assembled by putting together from the back side of an outer cylinder is comprised, there are various effects, such as an assembly work efficiency improves.

Claims (1)

By rotating the rear outer cylinder 1b which is freely rotatable and detachable at the rear end of the front outer cylinder 1a, the pen core delivery mechanism 6 housed in the front outer cylinder 1a is operated in a related manner. In the mechanical pencil which is made to deliver 2), the cam mechanism 9 which is arrange | positioned at the back of the said pen core sending mechanism 6, and makes this pen core sending mechanism 6 perform a pen core sending operation, and this rotation A driver 18 is provided for connecting and fixing the cam 20 of the cam mechanism 9 and the rear outer cylinder 1b. These pen core feeding mechanisms 6, the rotary cam mechanism 9, and the driver 18 are provided. Sharp pencil, characterized in that formed so as to be assembled in order from the rear of the outer cylinder (1).