JPH061832Y2 - Automatic extension type mechanical pencil lead guide pipe intermittent movement device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is directed to a lead guide pipe of an automatic feeding type mechanical pencil in which, when a certain amount of the core is worn by writing, the lead is automatically paid out by the worn amount. The present invention relates to an intermittent transfer device.

[Conventional technology]

The applicant of the present invention has disclosed Japanese Patent Application No. 62-1736 as a device for intermittent movement of the core guide pipes of an automatic feeding type mechanical pencil.
No. 3 and Japanese Patent Application No. 62-31557, which were previously filed, the ones previously filed are retainers in which both the fastening member and the flat member are fixed to the core guide pipe or the barrel and the ball is attached. When the ball is frictionally connected to the elastic body, the ball is positioned between the fastening member and the flat member to exert the intermittent movement of the core guide pipe.

[Problems to be solved by the invention]

Therefore, when the core guide pipe receives a force in the direction perpendicular to the axial direction (hereinafter referred to as the radial direction) due to writing at an angle when writing or the shaft tube is shaken laterally, There was a risk that the ball would move along the tapered surface and the retainer would move. If this retainer moves, when the bias of the lead guide pipe is released and the retainer returns to the center, the balls may be separated from the tapered surface of the fastener and the intermediary movement device of the lead guide pipe may not work.

[Means for solving problems]

This invention solves the above-mentioned problems, in an automatic feeding type mechanical pencil having a lead holding device that moves the lead axially forward with a slight force but holds it axially backward with a strong force. , A shaft tube and a core guide pipe that is slidably mounted in the shaft tube in the axial direction and urged forward in the axial direction are provided with a fastening member having a tapered surface inclined in the axial direction. At the same time, a flat member having a flat surface portion extending flat in the axial direction is provided on the other side, and at least one of the fastener member and the flat surface portion is configured to be swingable in the radial direction.

[Action]

Therefore, when writing while tilting the barrel, the core guide pipe is pushed toward the paper surface and is pushed to one side in the radial direction. However, since at least one of the fastener member and the flat surface portion is swingably attached to the barrel or the core guide pipe, the fastener or the flat surface portion is shaken by the amount that the core guide pipe is moved to one side. The ball does not move and is not pressed against the tapered surface of the fastener by a strong force, and the ball is always positioned by being pressed between the tapered surface and the flat surface portion of the fastener by an appropriate force.

〔Example〕

 Embodiments of the present invention will be described below.

First, the embodiment of FIGS. 1 and 2 will be explained.
The core guide pipe 2 is loosely fitted therein so as to be swingable in the axial direction.
A flat member 3 is fixed to the lead guide pipe 2, and a flat holder 5 for holding the lead 4 with an appropriate force is built in the flat member 3. Next, the intermittent movement device of the core guide pipe 2 will be described. A contact step 3A is provided in the front part of the flat member 3 and is stretched between the corresponding contact step 3A and the inner collar 1A of the barrel 1. The flat member 3 is always urged forward by the front spring 6 in the axial direction. A flat surface portion 3B that extends flat in the axial direction is formed on the outer periphery of the flat member 3 that is axially rearward of the contact step 3A, and a receiving step 3C is formed axially rearward of the flat surface portion 3B. . On the other hand, a fastener member 7 is loosely fitted in the recessed portion 1B of the shaft cylinder 1 so as to be swingable in the radial direction, and the fastener member 7 is provided with a tapered surface 7A that widens toward the rear in the axial direction. Moreover, the tapered surface 7A is the flat member 3
Of the flat surface portion 3B. A retainer 8 is loosely fitted between the contacting step 3A and the receiving step 3C of the flat member 3, and a ball 9 is rotatably attached to the retainer 8. The outer peripheral surface of the retainer 8 is frictionally fitted with the inner collar 10A of the elastic body 10 fixed to the fastening member 7, and the retainer 8 is biased toward the tapered surface 7A side of the fastening member 7, so that the ball 9 is The taper surface 7A and the flat surface portion 3B of the fastener member 7 are brought into contact with each other. The above is the description of the inter-moving device for the core guide pipe of the automatic drawing-out mechanical pencil. Further, in the shaft cylinder 1, a ball is used in the fastener 11 and the head, which is frequently used in the conventional automatic drawing-out mechanical pencil. Chuck 13 provided with 12 and chuck spring 14
・ Consists of wick tank 15 and return spring 16, etc.
An automatic feeding mechanical pencil is completed by incorporating a lead holding device that can move the lead 4 axially forward with a slight resistance but holds it axially backward with a strong force.

Next, the operation of the embodiment shown in FIG. 1 will be described. Writing causes the core 4 to wear and the core guide pipe 2 retracts axially rearward, but the core guide pipe 2 and the flat member 3 also retract. In this state, when the writing is temporarily stopped and the tip of the core guide pipe 2 is separated from the paper surface, the flat member 3
Does not move forward even though it is biased axially forward by the front spring 6. The reason for this is that the ball 9 and the taper surface 7A of the fastening member 7 of the inter-guide guide pipe intermittent movement device are
This is because, due to the wedge action, the flat member 3 can be moved rearward in the axial direction with a slight force, but is held forwardly in the axial direction with a strong force. Moreover, at this time, since the core tube 1 is tilted for writing, the core guide pipe 2 is moved in the radial direction or the shaft tube 1 is shaken in the radial direction, so that the flat member 3 shakes laterally and the ball 9 moves in the radial direction. Ball 9
Since the fastening member 7 can also be swung in the same direction, the ball 9 is always kept in contact with the tapered surface 7A of the fastening member 7, and the wedge action of the ball 9 is reliably operated. Then, when the flat member 3 is retracted by a certain amount, the contact step 3A of the flat member 3 is brought into contact with the front end of the retainer 8, and the retainer 8 is retracted against the friction fitting force of the elastic body 10. Then, the ball 9 attached to the retainer 8 also retreats in conjunction with the retainer 8, and the ball 9 moves toward the tapered surface 7 of the fastening member 7.
When separated from A, the wedge action is released and the state shown in FIG. 3 is obtained. Therefore, the flat member 3 biased forward by the front spring 6 advances axially forward. Then, the receiving step 3C of the flat member 3 comes into contact with the rear end of the retainer 8, and the elastic member 1
The retainer 8 is moved forward against the zero friction fitting force. Then, the ball 9 comes into contact with the tapered surface 7A of the fastening member 7 and returns to the state of FIG.

As shown in FIG. 4, the pressure contact pipe 17 is externally fitted to the flat surface portion 3B of the flat member 3 of the embodiment shown in FIG. 1, and the pressure contact spring 18 is provided between the pressure contact pipe 17 and the receiving stage 3C. If the structure in which the press-contact pipe 17 is brought into contact with the ball 9 is added by stretching, the wedge action between the ball 9 and the tapered surface 7A of the fastening member 7 becomes more reliable.

Further, in the above embodiment, the fastener member is loosely fitted to the shaft cylinder,
As shown in FIG. 5, even if the fastener member 107 is swingably fitted in the recessed portion 102A of the core guide pipe 102 as shown in FIG. And the fastening member 107 are interlocked with each other, and the same purpose as in the above-described embodiment is obtained. Moreover, if the rear end outer flange 102B of the core guide pipe 102 is provided with a plurality of cut grooves in the axial direction so as to have elasticity, the fastening member 107 can easily be provided.
It is loosely fitted in the second recess 102A.

In each of the above-mentioned embodiments, the fastener member is described as an embodiment that is swingable in the radial direction, but next, an embodiment in which the flat surface portion is a separate member and is swingable from the flat member explain.

In the embodiment of FIG. 6, the fastening member 7 is fixed to the shaft cylinder 101, the flat member 103 is fixed to the core guide pipe 2, and the flat surface portion 1 is formed in the recess 103D of the flat member 103.
03B is loosely fitted. Further, the fastener member 7 and the retainer 8 are connected by an elastic body 10 with an appropriate friction fitting force. The frictional connection between the fastener member 7 and the retainer 8 is
It is not limited to those directly connected by the elastic body 10, and although not shown, a member to which a fastening member is fixed, for example, a member such as a shaft cylinder is frictionally connected to the retainer with an elastic body, or a part of the fastening device or the retainer. There is no problem even if a tongue-like elastic piece is provided on the to form an elastic body, and the fastener and the retainer are frictionally connected by the elastic body.

In the embodiment shown in FIG. 7, the fastener member 207 is attached to the core guide pipe 2.
And the flat member 203 is fixed to the barrel 1,
The flat surface portion 203 is formed in the concave portion 203D of the flat member 203.
Fit B loosely. Further, the fastener member 207 and the retainer 8 are connected by an elastic body 10 with an appropriate friction fitting force.

FIG. 8 is an embodiment in which the intermittent movement device of the lead guide pipe described in the above embodiment is used in an automatic feeding type mechanical pencil in which a spare lead automatically follows, and a barrel 201 in which a base 19 is screwed. A core guide pipe 202 containing the core holder 5 is incorporated therein so as to be slidable in the axial direction. A fastener 111 is fixed in the shaft cylinder 201, and a front spring 6 stretched between an outer step 111A of the fastener 111 and an outer collar 202C of the core guide pipe 202 is used to guide the core guide pipe 2
02 for axially forward and lead core pipe 2
The outer collar 202C of No. 02 is brought into contact with the locking step 19A of the mouthpiece 19. The rod-shaped connecting portion 202D extending axially rearward of the lead guide pipe 202 is inserted into the through hole 111B of the fastener 111 and fixed to the flat member 303. On the other hand, a ball 12 is rotatably provided on the head of the chuck 13 built in the fastener 111, and at least the core holding portion of the chuck 13 is divided into several pieces. A chuck spring 14 is stretched between the outer stage 13A of the chuck 13 and the inner stage 111C of the fastener 111, and the chuck 13 is biased axially rearward. However, in the state shown in FIG. 8 in which the lead guide pipe 202 is positioned in the axially forward direction, the flat member 3
The pipe 20 provided on the inner side of the chuck 13
The chuck 13 is in contact with B and the chuck 13 is appropriately expanded.
Further, the fastener member 7 is loosely fitted in the recessed portion 201B of the shaft cylinder 201 so as to be swingable in the radial direction, and the core guide pipe including the flat member 303, the fastener member 7, the ball 9, the retainer 8 and the elastic body 10 is separated. If the moving device is constructed and incorporated in the same manner as in the above-described embodiment, the automatic lead-out mechanical pencil in which the spare lead automatically follows is completed.

Next, the operation of this embodiment will be described. In the state of FIG. 8, the lead 4 and the lead guide pipe 20 for writing are written.
When the tip of 2 is pressed against the paper surface, the core guide pipe 202
And the flat member 303 is slightly retracted so that the pipe 20 is separated from the chuck 13. Then, the chuck 13 is biased axially rearward by the chuck spring 14, and the ball 12 provided on the head of the chuck 13 is tightened by the fastener 111.
The core 4 is abutted against the tapered surface of the and holds the core 4 strongly against the rear in the axial direction. When writing is performed in this state and the lead 4 is worn by a certain amount, the abutment step 303A of the flat member 303 causes the retainer 8 to move.
1 is brought into contact with the front end of the ball 9 and operates in exactly the same manner as the inter-guide guide pipe intermittent movement device of FIG.
It is separated from the taper surface 7A. Therefore front spring 6
The core guide pipe 202 is forwarded to the foremost position in the axial direction by being repulsed by, and at this time, the core 4 held by the core holder 5 is also advanced together with the flat member 303, and the chuck 20 is expanded by the pipe 20. It returns to the state shown in FIG. In this state, when the core 4 in use is shortened and the rear end of the core 4 is located in front of the chuck 13, the chuck 1
Since the core 3 is widened, the core 4 in the core tank 21 is dropped into the chuck 13 by its own weight.

Even in the lead guide pipe intermittent movement device of the automatic drawing type mechanical pencil in which the spare lead automatically follows, one of the fastening member and the flat member is provided on the lead guide pipe and the other is provided on the shaft cylinder, and If at least one of the member and the flat surface portion provided on the flat member is configured to be swingable in the radial direction, the same operation as in the embodiment of FIG. 8 can be performed.

[Effect of device]

As described above, according to the present invention, the fastener member is provided on either one of the shaft cylinder and the core guide pipe axially slidably incorporated in the shaft cylinder and biased forward in the axial direction. A feature is that a flat member is provided on the other side, and at least one of the fastener member and the flat surface portion provided on the flat member is configured to be swingable in the radial direction.

As a result, even if the ball is moved in the radial direction by writing at an angle or when the barrel is shaken laterally, the fastener member or the flat surface portion that is swingable in the radial direction shakes together with the ball. Since the ball can be moved, the ball is always positioned between the tapered surface and the flat surface portion of the fastener by an appropriate force, and the intermittent movement of the core guide pipe can be reliably performed.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a main part showing an embodiment of the present invention, FIG. 2 is a lateral sectional view showing line AA of FIG. 1, and FIG. 3 shows the inter-guide guide pipe intermittent moving device in FIG. FIGS. 4 and 5, FIG. 6, FIG. 7, FIG. 8 and FIG. 8 are main-part vertical cross-sectional views showing another embodiment of the present invention in a released state. 1. 101. 201 ... Shaft barrel 1A ... Inner collar of shaft barrel 1B. 201B ... Recessed portion of shaft barrel 1.201 2. 102. 202 ... Core guide pipe 102A ... Recessed portion of core guide pipe 102. 102B ... Lead guide Rear end outer collar 202C of pipe 102 ... Outer collar 202D of core guide pipe 202 ... Connection portion of core guide pipe 202. 103. 203. 303 ... Flat member 3A / 303A ... Flat member 3303 contact step 3B. 203B ... Flat surface portion of flat member 3/203 3C ... Receiving step of flat member 3 103D / 203D ... Recessed portion of flat member 103/203 4 ... Core 5 ... Core holder 6 ... Front spring 7.107 / 207 ... Fastener Member 7A ... Fastening member Tapered surface of member 7 ... Retainer 9 ... Ball 10 ... Elastic body 10A ... Inner flange of elastic body 11 ... 111 ... Fastening tool 111A ... Fastening tool 11 Outer stage 111B ... through hole of fastener 111 111C ... inner stage of fastener 111 12 ... ball 13 ... chuck 13A ... outer stage of chuck 13B ... inner stage of chuck 13 ... chuck spring 15 ... core tank 16 ... return Spring 17 ... Pressure contact pipe 18 ... Pressure contact spring 19 ... Base 19A ... Locking stage of base 19 20 ... Pipe 21 ... Core tank

Claims (1)

[Scope of utility model registration request] 1. A lead guide pipe axially slidably housed in an axial cylinder and biased axially forward, and a lead that moves axially forward with a slight force but axially backward. Consists of a core holding device that holds with a strong force, the core guide pipe retracts with the wear of the core for writing, and when the core guide pipe moves forward in the axial direction, the core is drawn out following the core guide pipe. In the automatic pay-out mechanical pencil, a flat member in which a fastener member having a tapered surface inclined in the axial direction and a flat surface portion extending flat in the axial direction are integrally or separately formed Are arranged so as to face each other, and further, a retainer, which is attached to a flat member so as to be movable in the axial direction as appropriate, is frictionally connected to the fastener member via an elastic body and is rotatably provided on the retainer. The ball is positioned so that it can abut between the tapered surface of the fastener member and the flat surface portion of the flat member, and one of the fastener member and the flat member is provided on the core guide pipe and the other is provided on the barrel. At least one of the fastener member and the flat surface portion is configured to be swingable in a direction perpendicular to the axial direction, and a lead guide pipe intermittent movement device for an automatic pay-out mechanical pencil.