JP2017013344A - Shake-out type mechanical pencil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shake-out type mechanical pencil that can have its lead projection quantity adjusted by a movement quantity of a weight body in forward/backward shaking of a barrel.SOLUTION: A shake-out type mechanical pencil is provided with an abutting part 4c provided in a barrel 2 so as to abut when a weight body 16 moves back and an operation body 14 which moves the position where the weight body 16 and abutting part 4c abut on each other forward and backward along the axis of the barrel.SELECTED DRAWING: Figure 1

Description

  In the present invention, a writing body is moved to a shaft cylinder by a chuck that pushes a pushing body provided in a core feeding mechanism with a weight body advanced by shaking the shaft cylinder back and forth, and moves forward by the advancement of the pushing body. It is related with the swing-out type mechanical pencil protruded from the front-end | tip opening part.

Conventionally, a push body is pushed by a weight body advanced by swinging the shaft cylinder back and forth, and a writing core is projected from the tip opening of the shaft cylinder by a chuck that moves forward by the advance of the push body. The swing-out mechanical pencil equipped with the lead feeding mechanism is convenient because it can feed the lead without changing the shaft tube, and has actually been highly evaluated in the market.
This swing-out mechanical pencil has a structure in which, when the shaft cylinder is shaken, the weight body moves forward and comes into contact with the pushing body to advance the pushing body and the chuck. The length of the writing core protruding from the tip opening of the shaft cylinder (hereinafter referred to as the centering amount) varies depending on the size of the shaft. This is due to a change in impact force received from the weight body that comes into contact with the pusher. If the impact force is large, the amount of advancement of the chuck that is driven by the pusher and the core held by the chuck is large and long. If the impact force is small, the centering amount is short.

  Patent Document 1 discloses a mechanical pencil in which the centering amount that changes depending on how to swing can be adjusted by an adjustment mechanism. Specifically, the mechanical pencil of Patent Document 1 is a chuck ring that is fitted to a chuck that sandwiches a writing core by rotating an adjustment ring that is rotatably attached to the tip of a shaft cylinder to move the base in the axial direction. By changing the distance that the holder can be moved, the position where the chuck ring holder opens the chuck is moved back and forth to adjust the centering amount.

JP 2012-125947 A

The mechanical pencil described in Patent Document 1 adjusts the centering amount with an adjusting mechanism provided on the base side, which is not related to the amount of movement of the weight body in the front-rear direction.
When the present inventor shakes the shaft cylinder to draw out the writing core, the inventor changes the magnitude of the sliding sound or contact sound with other members generated by the weight body moving in the front-rear direction in the shaft cylinder. Adjusting the centering amount of the writing core with the amount of movement of the weight body when the shaft cylinder is swung back and forth in consideration of the user's demand for a swing-out mechanical pencil that matches the change in the centering amount The purpose was to obtain a swing-out mechanical pencil that can be used.

The present invention
“1. A lead tank mechanism having a lead tank for storing a writing lead and a chuck for holding the writing lead inside the shaft tube, and a weight body for operating the lead feeding mechanism by swinging the shaft tube back and forth. The pusher provided in the core feeding mechanism is pushed with the weight body advanced by shaking the shaft cylinder, and the writing is performed by the chuck that moves forward by the advancement of the pusher. In the swing-out mechanical pencil that protrudes from the tip opening of the shaft cylinder, a contact portion provided in the shaft cylinder so as to contact when the weight body is retracted, and the weight body and the contact portion. An oscillating mechanical pencil comprising: an operating body that moves the contact position back and forth in the axial direction of the shaft cylinder.
2. An insertion hole through which the weight body is inserted into the operation body and a slit portion extending in the axial direction of the shaft cylinder are formed, and a through hole through which the core tank is inserted into the weight body and a slit portion of the operation body A projecting portion that moves, and an abutting portion having an inclined surface that abuts the projecting portion of the weight body on the inner surface of the shaft tube, and the operating body is rotated with respect to the shaft tube Thus, the protruding portion of the weight body is rotated by the slit portion of the operating body, and the contact position where the protruding portion formed on the weight body contacts the inclined surface formed on the inner surface of the shaft tube 2. The swing-out mechanical pencil according to the item 1, which is moved back and forth in the axial direction.
3. A front step is formed on the outer surface of the operation body, a rear step is formed on the inner surface of the shaft tube, and a resilient member is stretched between the front step and the rear step to 3. The swing-out mechanical pencil according to the item 2, wherein the shaft cylinder is always repelled rearward. It is.

The swing-out mechanical pencil of the present invention changes the amount of movement of the weight body moving in the front-rear direction within the shaft cylinder by changing the contact position when the weight body is retracted by operating the operation body in the front-rear direction. If the weight body is set to move back and forth largely even if the way of swinging the shaft cylinder is constant, the pusher provided on the core feeding mechanism is greatly increased by a large impact force. When it is set so that a long centering amount is obtained by pushing, and the weight body is moved back and forth small, the weight body pushes the pushing body provided in the center feeding mechanism small and short with a small impact force. A centering amount can be obtained.
Therefore, the user can feel that a long centering amount has been obtained with a large impact sound or vibration when the weight body comes into contact with the pushing body with a large impact force, and the weight body has a small impact force. It is possible to feel that a short centering amount has been obtained with a small impact sound or vibration when coming into contact with the pusher.

  Further, as a method of moving the contact position between the weight body and the contact portion that contacts when the weight body is retracted back and forth in the axial direction of the shaft cylinder by the operation body, the contact portion is provided on the operation body itself. A sliding method in which the contact portion is moved back and forth by moving the operating body back and forth, and an inclined surface inclined in the front-rear direction is formed on the inner surface of the shaft tube, and the position where the weight body contacts the inclined surface Examples of the rotation method include changing the operation body according to rotation.

In particular, the rotation method of rotating the operating body with respect to the shaft cylinder includes the operating direction (axial circumferential direction) of the operating body and the direction of the impact force when the weight body moves backward and contacts the contact portion ( Since the operation direction of the operating body (axial center direction) is different from that of the axial center direction, the direction of the impact force (axial center direction) when the weight body retracts and contacts the contact portion is the same. Compared to the slide method, this is superior in that it prevents the malfunction of moving the operating body due to the impact of a heavy body.
Further, in the rotation method of rotating the operating body with respect to the shaft tube, a front step portion is formed on the inner surface of the shaft tube, a rear step portion is formed on the outer surface of the operation body, and the front step portion and the rear step portion are If a resilient member is stretched between the operation body and the operation body is always repelled rearward with respect to the shaft tube, a force is applied to the operation body in the axial direction, so the operation body is rotated. Further, the position of the operating body is difficult to shift, and the rotational position of the operating body can be prevented from shifting even when the impact force of the weight body is applied to the inclined surface as the contact portion.

  According to the present invention, it is possible to obtain a swing-out type mechanical pencil capable of adjusting the centering amount of the writing core by the moving amount of the weight body when the shaft cylinder is swung back and forth.

It is a longitudinal cross-sectional view of the swing-out type mechanical pencil of a present Example. FIG. 2 is an end view taken along line AA in FIG. 1. It is explanatory drawing for demonstrating the relationship between the protrusion part of a weight body, and the contact part of the rear-shaft inner surface. FIG. 4A is an explanatory diagram for explaining the relationship between the projecting portion of the weight body and the abutting portion of the inner surface of the rear shaft, and FIG. 4B shows a state in which the projection of the weight body is at the position of the second step on the inner surface of the rear shaft, and FIG. 4C shows the position of the projection of the weight body at the position of the fifth step on the inner surface of the rear shaft. It is the figure which showed a certain state.

  Hereinafter, based on FIGS. 1-4, the swing-out type mechanical pencil of the Example in this invention is demonstrated. Moreover, in a present Example, the side with a writing front-end | tip part is expressed as the front, and the opposite side is expressed as back. Moreover, the side close to the axial center of the shaft cylinder is expressed as inward, and the opposite side is expressed as outward.

As shown in FIG. 1, the oscillating mechanical pencil 1 includes a shaft cylinder 2 having a front shaft 3, a rear shaft 4 disposed behind the front shaft 3 and screwed to the front shaft 3, and a front shaft 3. And a front end of a writing core 7 that is fed to the front end 5 by a lead feeding mechanism 6 disposed inside the front shaft 3. A tip opening 5a from which the portion 7a protrudes is provided.
Here, the lead feeding mechanism 6 includes a chuck 8, a connector 9 disposed behind the chuck 8, and a pipe-shaped lead tank that is connected to the chuck 8 via the connector 9 and accommodates a spare writing lead. 10, a fastener 11 fitted on the head 8 a of the chuck 8, a connector 12 that receives the fastener 11, and a chuck stretched between the connector 12 and the connector 9 with a load of 200 g or less. And a spring 13.
Further, the lead feeding mechanism 6 operates via the lead tank 10 that contacts when the operating body 14 moves forward by pushing the operating body 14 projected from the rear end of the shaft cylinder 2. The lead tank 10 is connected to a chuck 8 that sandwiches the writing lead 7 via a connector 9 in which a rear portion 9a is inserted into an opening 10a of the lead tank 10, and the chuck 8 is connected to the operating body 14 and the lead tank 10. It is intended to follow the back and forth movement of the.

  The connector 12 is sandwiched between the front end of the front shaft 3 and the inner stage 5b of the front end body 5 screwed to the front shaft 3, and the front end body 5 holds the writing core 7 with an appropriate force. A core holder 15 formed of an elastic body such as rubber is incorporated.

A weight body 16 obtained by cutting a metal into a cylindrical shape is externally fitted to the core tank 10 formed in a pipe shape so as to be slidable and rotatable with respect to the core tank 10.
Further, the weight body 16 is formed with a protruding portion 16a protruding outward at the rear portion, and with a through hole 16d through which the core tank 10 is inserted in the inner portion.

In addition, a cylindrical cylindrical member 17 provided with an insertion hole 17 a penetrating in the axial direction is disposed inward of the rear shaft 4 and outward of the core tank 10, and behind the cylindrical member 17. A cylindrical pressing member 18 provided with an inner stepped portion 18a that comes into contact with the rear end 10b of the lead tank 10 is disposed, and two locking holes 17b provided facing the outer periphery of the rear portion of the cylindrical member 17. Further, two locking projections 18b provided to face the front portion of the pressing member 18 are respectively locked, and the tubular member 17 and the pressing member 18 are connected so as not to rotate. Further, an eraser insertion portion 18c is formed in the rear inner hole of the pressing member 18, and an eraser 19 is detachably attached to the eraser insertion portion 18c. Further, a cap 20 is disposed behind the pressing member 18, and the front end of the cap 20 is brought into contact with a rear step portion 18 d formed by projecting to the center outer peripheral portion of the pressing member 18. 20 is detachably fitted.
Here, the operating body 14 includes a cylindrical member 17, a pressing member 18, an eraser 19, and a cap 20, and forms an outer portion so that each component member can be rotated with respect to the rear shaft 4. The operating body 14 is configured to be slidable forward and backward and rotatable with respect to the rear shaft 4. In addition, when the cap 20 is grasped and the cap 20 is rotated to the left or right with respect to the rear shaft 4, the rotation generated when the operating body 14 is rotated so that the entire operating body 14 is rotated. The fitting force between the cap 20 and the pressing member 18 is configured to be stronger than the resistance.
In addition, a coil spring 21 is stretched between the front end of the rear step portion 18d of the pressing member 18 and the front step portion 4a formed so as to protrude on the inner periphery of the rear shaft 4 to operate the rear shaft 4. The body 14 is bulleted backwards.

  The connector 9 is provided with elastic pieces 9c extending circumferentially in the circumferential direction from the base 9b at two opposing positions of the base 9b in the substantially middle part of the connector 9. In addition, a protruding portion 9d that protrudes rearward in the axial direction is formed at the tip of each of the two elastic pieces 9c. As a result, a pusher 22 is formed on the connector 9 so that the tip end 16e of the weight body 16 abuts to prevent forward movement. When the weight body 16 comes into contact with the pushing body 22, the impact force at the time of contact is absorbed by the flexure of the elastic piece 9b, and the chuck 8 and the lead tank 10 are moved forward to enter the lead tank 10. The accommodated writing core 7 can be drawn out.

As shown in FIGS. 1 and 2, the cylindrical member 17 is formed with a slit portion 17c extending rearward from the front end, and by sliding the projection portion 16a of the weight body 16 into sliding contact with the slit portion 17c, The weight body 16 is configured to be unrotatable and slidable with respect to the cylindrical member 17.
The protruding portion 16a of the weight body 16 protrudes further outward from the outer peripheral surface of the cylindrical member 17, and the outer end 16b of the protruding portion 16a is formed close to the inner peripheral surface 4b of the rear shaft 4. .

Here, the relationship between the protrusion 16a of the weight body 16 and the contact portion 4c on the inner surface of the rear shaft 4 will be described with reference to FIG. FIG. 3 is an enlarged view showing the abutting portion formed on the inner surface of the rear shaft, and the rear end of the protruding portion 16a is shown on the inner peripheral surface 4b of the rear shaft 4 when the weight body 16 is retracted. As the abutting portion 4c with which 16c abuts, six step portions are formed on a step-like inclined surface 4d extending rearward on the inner periphery.
As a result, the weight body 16 is loosely fitted between the protrusion 9 d of the connector 9 and the abutting portion 4 c of the rear shaft 4. Further, when the operating body 14 is rotated with respect to the rear shaft 4, the weight body 16 is driven and rotated by the protrusion 16a, and the contact portion 4c of the rear shaft 4 that contacts the rear end 16c of the protrusion 16a. By moving the position in the axial direction, the contact portion 4c that contacts the protrusion 16a is shifted to another stage, and the moving amount L by which the weight body 16 moves back and forth is changed.
Note that the six stepped portions make the moving amount L of the weight body 16 when contacting the first stepped portion 4e substantially zero, and the second stepped portion 4f and the third stepped portion. 4g, 4th step 4h, 5th step 4i, and 6th step 4j, the moving amount L of the weight body 16 gradually increases, and the 4th step When the protrusion 16a of the weight body 16 is aligned with the position of the portion 4h, the movement amount L is adjusted so that the centering amount is just good. Therefore, in this embodiment, the standard position is the case where the protrusion 16a of the weight body 16 abuts on the fourth step 4h.

Next, a state where the operating body 14 is rotated to change the moving amount L of the weight body 16 will be described with reference to FIG. 4 is an enlarged view showing the abutting portion 4c in order to explain the relationship between the protruding portion 16c of the weight body 16 and the abutting portion 4c on the inner surface of the rear shaft 4 as in FIG. 4A shows a state in which the protruding portion 16a of the weight body 16 is in the position of the fourth step portion 4h on the inner surface of the rear shaft 4. FIG. 4B shows a state in which the protruding portion 16c of the weight body 16 has a third surface on the inner surface of the rear shaft 4. 4C is a diagram showing a state in which the protrusion 16c of the weight body 16 is located at the position of the fifth step 4i on the inner surface of the rear shaft 4.
As shown in FIG. 4A, when the protrusion 16a of the weight body 16 is at the position of the stepped portion 4h of the four-step surface, which is the standard position of the contact portion 4c of the rear shaft 4, the weight body is shaken by shaking the shaft cylinder 2. 16 is moved between the fourth stepped portion 4h of the connector 9 and the elastic piece 9c of the connector 9, and the front end of the weight body 16 having inertia force abuts on the elastic piece 9c of the connector 9 to generate an impact force. When the connector 9 advances, the chuck connected to the connector 9 follows and advances, and the writing core 7 is fed forward from the front end opening 5 a of the front end body 5.
If the centering amount when the writing core 7 is extended is long, the entire operating body 14 is rotated with respect to the rear shaft 4 by grasping the cap 20, thereby slidingly contacting the slit portion 17 c of the cylindrical member 17. The weight body 16 having the protrusion 16a is driven and rotated, and the protrusion 16a of the weight body 16 is brought into contact with the position of the third step 4g shown in FIG. The amount of movement of the weight body is shortened from L1 to L2 by the amount the contact portion 4c is shifted forward by one step, and the inertia force obtained while the weight body 16 moves is reduced by that amount, so the impact force is reduced. . For this reason, the amount of movement of the chuck 8 is shortened, the centering amount can be shortened, and the impact sound and vibration transmitted to the user are also reduced.
Although not shown, if the centering amount is still long even when the protrusion 16a of the weight body 16 is aligned with the position of the third step 4g, the position of the second step 4f at the front of the second step is set. By aligning the protrusions 16a, the centering amount can be further shortened, and the impact sound and vibration transmitted to the user are further reduced.

Further, when the centering amount is small at the standard position, the operating body 14 is rotated in the opposite direction to the case where the centering amount is large, and the protrusion 16a of the weight body 16 is placed at the position of the fifth step 4i shown in FIG. 4C. By matching, the amount of movement of the weight body is increased from L1 to L3 by the amount of the contact portion 4c with which the protrusion 16a abuts backward, and the inertial force obtained while the weight body moves accordingly. Increases and impact force increases. For this reason, the length of advancement of the chuck is increased, the centering amount can be increased, and the impact sound and vibration transmitted to the user are also increased.
Although not shown, if the centering amount is still short even when the protruding portion 16a of the weight body 16 is aligned with the position of the fifth step portion 4i, it is positioned at the position of the sixth step portion 4j at the rear of the other step. By aligning the protrusions 16a, the centering amount can be further increased, and the impact sound and vibration transmitted to the user are further increased.
Therefore, when using the swing-out mechanical pencil 1 of the present embodiment, the user has a long centering amount due to a large impact sound or vibration when the weight body 16 abuts against the pushing body 22 with a large impact force. It is possible to feel that the weight has been obtained, and it is possible to feel that a short centering amount has been obtained with a small impact sound or vibration when the weight body 16 abuts against the pusher 22 with a small impact force. Become.

  Further, when the operating body 14 is rotated, the operating body 14 is applied to the rear in the axial direction by the elastic force of the coil spring 21, so that the cylindrical member is placed on the front end 4 k of the front step portion of the rear shaft 4. The rear end 17f of 17 is pressed, and a rotation resistance is generated. For this reason, even when the impact force of the weight body 16 is applied to the contact portion 4c, it is possible to prevent the rotational position of the operation body 14 from shifting.

Further, although not shown in the drawing, by adjusting the position of the protrusion 16a of the weight body 16 to the first step 4e, the moving amount of the weight body 16 is reduced, and the core is extended even if the shaft cylinder 2 is swung back and forth. Insufficient inertia can not be obtained. For this reason, when carrying out the swing-out type mechanical pencil of a present Example in a bag etc., even if a weight body is shaken by shaking a bag, it can prevent that a lead is drawn out accidentally.
As described above, it was possible to obtain a swing-out type mechanical pencil capable of adjusting the centering amount of the writing core by the amount of movement of the weight body when the shaft cylinder was swung back and forth.

  The present invention is a swing-type mechanical pencil capable of adjusting the amount of movement of the weight body by swinging the shaft cylinder and moving the weight body back and forth so that the chuck can be advanced to feed out the core accommodated in the core tank. This can be applied to adjust the centering amount.

1 ... swing-out mechanical pencil,
2 ... shaft tube,
3 ... Front shaft,
4 ... rear shaft, 4a ... front step portion, 4b ... inner peripheral surface, 4c ... contact portion, 4d ... inclined surface,
4e ... 1st step, 4f ... 2nd step, 4g ... 3rd step, 4h ... 4th step, 4i ... 5th step, 4j ... 6th step Step, 4k ... front end,
5 ... tip body, 5a ... tip opening, 5b ... inner stage,
6 ... Core feeding mechanism,
7 ... writing core, 7a ... front end,
8 ... chuck, 8a ... head,
9 ... Connector, 9a ... Back part, 9b ... Base part, 9c ... Elastic piece, 9d ... Projection part,
10 ... core tank, 10a ... opening, 10b ... rear end,
11 ... Fasteners,
12 ... Connector,
13 ... Chuck spring,
14 ... operating body,
15 ... Core holder,
16 ... Weight body, 16a ... Projection, 16b ... Outer end, 16c ... Rear end, 16d ... Through hole,
16e ... the tip,
17 ... Cylindrical member, 17a ... Insertion hole, 17b ... Locking hole, 17c ... Slit part,
18 ... Pushing member, 18a ... Inner step, 18b ... Locking projection, 18c ... Eraser insertion part,
18d: rear step,
19 ... Eraser,
20 ... Cap,
21 ... Coil spring,
22 ... Pushing body
L: Movement amount,
L1 ... movement amount,
L2: Movement amount,
L3: Movement amount.

Claims (3)

Inside the shaft cylinder, there are arranged a core tank for storing the writing core and a core feeding mechanism having a chuck for clamping the writing core, and a weight body for operating the core feeding mechanism by swinging the shaft cylinder back and forth. The pushing body provided in the lead feeding mechanism is pushed by the weight body advanced by shaking the shaft cylinder, and the writing lead is moved by the chuck that moves forward by the advancement of the pushing body. In a swing-out mechanical pencil that protrudes from the tip opening of the shaft tube, a contact portion provided in the shaft tube so as to contact when the weight body is retracted, and a contact position between the weight body and the contact portion And an operating body that moves the actuator back and forth in the axial direction of the shaft cylinder. An insertion hole through which the weight body is inserted into the operation body and a slit portion extending in the axial direction of the shaft cylinder are formed, and a through hole through which the core tank is inserted into the weight body and a slit portion of the operation body A projecting portion that moves, and an abutting portion having an inclined surface that abuts the projecting portion of the weight body on the inner surface of the shaft tube, and the operating body is rotated with respect to the shaft tube Thus, the protruding portion of the weight body is rotated by the slit portion of the operating body, and the contact position where the protruding portion formed on the weight body contacts the inclined surface formed on the inner surface of the shaft tube The swing-out mechanical pencil according to claim 1, which is moved back and forth in the axial direction. A front step is formed on the outer surface of the operation body, a rear step is formed on the inner surface of the shaft tube, and a resilient member is stretched between the front step and the rear step to 3. The swing-out mechanical pencil according to claim 2, wherein the shaft cylinder is always bulleted rearward.

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