JP5647542B2 - Knock mechanical pencil - Google Patents

Description

  The present invention relates to a knock-type mechanical pencil capable of writing with a certain amount of core protruding from the tip by a single knock operation.

  Conventionally, when the notch is pressed, the writing core stopper collet chuck is in a non-stopping state, allowing the writing core to enter and exit freely, and when the pressing against the notch is released, the writing core stopper collet chuck is In the writing core holder of the type that stops the writing core in a state, it is structured so that the same pressure is not transmitted to the collet chuck at the initial stage of the pressing of the notch, and the inner diameter on the front surface of the chuck is almost the same as the diameter of the writing core. An annular stopper equipped with an anti-scratch function is placed in contact with the chuck, and a support arm is provided on both sides of the stopper, and the base end of the support arm is fixed to the tip of the notch. The stopper is exposed to the front of the collet chuck opening at a predetermined interval by the initial operation of pressing the notch, and the notched state is maintained during the latter operation and the initial return operation of the notch, and the notch is returned. Writing lead holder made as occupied Fukuse the former shape has been known by late operation. (See Patent Document 1)

  However, the writing core holder is inserted into the stopper (8) when knocked, and the writing core (I) protrudes from the stopper (8) when the knock is released. In order to do this, while knocking, the stopper (8) side must be faced up and the writing core (a) must be dropped into the collet chuck (4), which is very difficult to operate.

Japanese Utility Model Publication No. 55-99887

  The problem to be solved is that it is not necessary to point the writing tip upward when immersing the protruding core.

  According to the present invention, a fastener is externally fitted to the head of the chuck, the fastener is loosely fitted in a concave groove of the coupling tool so as to be appropriately movable in the longitudinal direction, a core tank is fixed to the rear part of the chuck, A chuck spring is installed between the lead tanks, the head of the chuck is pressed by the fastener, the fastener is pressed by the connector, the chuck is closed and the lead is held, and the slider is fixed to the connector in the longitudinal direction. The connector and the slider are configured to be movable in the longitudinal direction with respect to the tip member connected to the shaft cylinder so as to be displaceable, and the connector is moved in the longitudinal direction by a return spring having a mounting load weaker than the chuck spring. The engagement portion provided on the tip member and the engagement portion provided on the slider are configured to be able to engage with a force weaker than the load when the return spring is mounted. Weaker take The slider is urged rearward in the longitudinal direction by the front spring provided in the tip member with an hour load, and the lead holder provided on the slider holds the lead with a holding force weaker than the load at the time of mounting the front spring. Is the most important feature.

  The present invention is capable of feeding and returning the lead by a normal small knock operation, and also performs a knock operation and presses the lead against the paper or the like to retract to the tip of the slider, and then the knock is terminated. The advantage that the core can be protruded from the tip of the slider by the amount is obtained.

FIG. 1 is a cross-sectional view of the main part showing a knock mechanical pencil according to a first embodiment of the present invention. Example 1 FIG. 2 is an enlarged plan view of a main part showing a slider and a connector in the knock mechanical pencil of FIG. Example 1 FIG. 3 is a cross-sectional view of the main part of the knock type mechanical pencil according to the first embodiment of the present invention showing a state where the core is pressed against the paper surface while the slider is advanced and the chuck is expanded. Example 1 FIG. 4 is a cross-sectional view of the main part of the knock type mechanical pencil according to the first embodiment of the present invention, showing a state in which the chuck protrusion is locked to the inner flange of the locking member and the chuck is closed. Example 1 FIG. 5 is a cross-sectional view of the main part of the knock type mechanical pencil according to the first embodiment of the present invention, showing a state in which the front end edge of the sliding groove of the coupler is in contact with the protrusion of the slider locked to the inner collar of the locking member. It is. Example 1 FIG. 6 is a cross-sectional view of the main part showing a state in which the protrusion of the slider comes off from the inner collar of the locking member and contacts the sliding groove rear end edge of the coupling member in the knock type mechanical pencil according to the first embodiment of the present invention. It is. Example 1 FIG. 7 is a cross-sectional view of the main part of the knock type mechanical pencil according to the first embodiment of the present invention, in which a small knock operation is performed, the chuck is expanded, abuts against the slider, and the core is pressed against the paper surface. Example 1 FIG. 8 is a cross-sectional view of the main part showing a knock type mechanical pencil of Example 2 of the present invention. (Example 2) FIG. 9 is a cross-sectional view of the main part showing a knock type mechanical pencil of Example 3 of the present invention. (Example 3) FIG. 10 is an enlarged plan view showing a slider in the knock mechanical pencil of FIG. (Example 3) FIG. 11 is a cross-sectional view of the main part of the knock type mechanical pencil according to the third embodiment of the present invention showing a state where the core is pressed against the paper surface while the slider is advanced and the chuck is expanded. (Example 3) FIG. 12 is a cross-sectional view of the main part of the knock type mechanical pencil according to the third embodiment of the present invention, in which a small knock operation is performed, the chuck is expanded, abuts against the slider, and the core is pressed against the paper surface. (Example 3) FIG. 13: is principal part sectional drawing which shows the knock type mechanical pencil of Example 4 of this invention. Example 4 FIG. 14 is a cross-sectional view of the main part showing a state in which the lead is pressed against the paper surface in a state where the slider is advanced and the chuck is expanded in the knock type mechanical pencil of Example 4 of the present invention. Example 4 FIG. 15 is a cross-sectional view of the main part showing a state in which the chuck is closed by locking the protrusion of the slider to the inner collar of the locking member in the knock type mechanical pencil of Example 4 of the present invention. Example 4

  A knock-type mechanical pencil that can be used to perform normal lead-out and lead-back operations with a small knock, and to allow the lead to protrude from the tip of the slider by a fixed amount by performing the knock operation.

  Hereinafter, based on FIG.1, FIG.2, FIG.3, FIG.4, FIG.5 and FIG. 6, the knock type mechanical pencil of Example 1 in this invention is demonstrated. Moreover, let the left side of FIG. 1 be the front, and let the right side be back. First, the writing state of FIG. 1 will be described. The fastener 2 is externally fitted to the head 1A of the chuck 1 whose front part is divided into a plurality of parts, and the pipe-shaped core tank 3 is press-fitted and fixed to the rear part of the chuck 1. The fastener 2 is loosely fitted in the concave groove 4A of the connector 4 so as to be appropriately movable in the longitudinal direction. A chuck spring 5 having a loading load of about 400 g is attached between the inner flange 4B of the connector 4 and the front end of the lead tank 3. The chuck spring 5 biases the chuck 1 backward in the longitudinal direction, the head 1A of the chuck 1 is pressed against the fastener 2, the chuck 1 is closed, and the core 6 is strongly held. A through-sliding groove 4C is formed at a relative position in the front portion of the connector 4, and an engaging groove 4D having a width narrower than the sliding groove 4C is continuously formed in the front portion of each sliding groove 4C. Is done.

  Two engaging projections 7A projecting outward are formed at the rear portion of the slider 7 at relative positions. A lead holder 8 for holding the lead 6 with a force of about 10 g is built in the front portion of the slider 7. The engaging projection 7A of the slider 7 is inserted into the sliding groove 4C through the engaging groove 4D of the connecting tool 4, so that the connecting tool 4 and the slider 7 cannot rotate and can slide in the longitudinal direction. Connected.

  The connecting tool 4 and the slider 7 incorporating the chuck 1 and the fastener 2 are inserted from the front of the shaft tube 9. Furthermore, the tip member 10 is removably screwed onto the front portion of the shaft tube 9 and attached. An engagement member 11 is built in the tip member 10, and an inner collar 11 </ b> A is formed at the front portion of the engagement member 11. The inner flange 11A of the engaging member 11 is divided into a plurality of kerfs so as to be able to bend, and can be engaged with the engaging protrusion 7A of the slider 7 with a force of about 50 g. The engaging member 11 and the engaging protrusion 7 </ b> A constitute an engaging portion between the tip member 10 and the slider 7. A return spring 12 is attached between the engaging member 11 and the outer flange 4E of the connector 4 with a load at the time of attachment of about 200 g, and urges the connector 4 rearward in the longitudinal direction. Further, a front spring 13 having a load of about 20 g is attached between the inner step 10A of the tip member 10 and the step portion 7B of the slider 7, and the slider 7 is urged rearward in the longitudinal direction to engage the slider 7. The joint protrusion 7A is brought into contact with the rear end edge 4F of the sliding groove 4C of the connector 4 to constitute a knock type mechanical pencil. The knock type mechanical pencil has a larger load when the front spring 13 is attached than the lead holding force of the lead holder 8, and the engagement protrusion 7 A of the slider 7 and the inner flange of the engagement member 11 than the load when the front spring 13 is attached. The engaging force of 11A is configured to be large. Further, the load at the time of attaching the return spring 12 is larger than the engaging force of the engaging projection 7A of the slider 7 and the inner flange 11A of the engaging member 11, and the load at the time of attaching the chuck spring 5 is larger than the load at the time of attaching the return spring 12. To do.

  In the writing state of FIG. 1, when writing is performed and the lead 6 is worn, a knocking operation is performed to press the lead tank 3 to advance the chuck 1. Then, since the load at the time of attachment of the chuck spring 5 is larger than that of the return spring 12, the coupler 4 moves forward together with the chuck 1. Further, the slider 7 is advanced by being pushed by the connector 4. Then, when the front end of the connector 4 comes into contact with the locking step 10B of the tip member 10, the advancement of the connector 4 stops. Further, when the chuck 1 is advanced, the lead 6 is fed out by the distance the fastener 2 has advanced in the concave groove 4A of the connector 4. Thereafter, the head 1A of the chuck 1 is detached from the fastener 2 and spreads. Further, when knocking is performed, the front end of the chuck 1 comes into contact with the rear end of the slider 7, and the slider 7 is advanced together with the chuck 1 to engage the engaging protrusion 7 </ b> A of the slider 7 with the inner flange 11 </ b> A of the engaging member 11. . Then, the engagement protrusion 7A of the slider 7 comes into contact with the front end edge 4G of the sliding groove 4C of the connector 4, and the advancement of the chuck 1 is stopped. In this state, the core 6 protrudes from the tip of the slider 7, but when the core 6 is pressed against the paper surface or the like, the core 6 is immersed in the slider 7 to be in the state shown in FIG.

  Next, when the knocking operation is stopped, the chuck 1 retreats, the head 1A of the chuck 1 is pressed against the fastener 2, the chuck 1 is closed, and the lead 6 is held again to be in the state shown in FIG.

  Then, since the slider 7 has the engaging projection 7A engaged with the inner flange 11A of the engaging member 11, the connecting tool 4 urged rearward by the return spring 12 moves backward by the distance L1, and the connecting tool 4 The front end edge 4G of the sliding groove 4C comes into contact with the engaging projection 7A of the slider 7, and the state shown in FIG. In this state, the core 6 is immersed from the tip of the slider 7 by a distance L1.

  Further, when the connecting tool 4 is moved rearward by the return spring 12, the slider 7 moves backward together with the connecting tool 4, and the engaging protrusion 7 </ b> A of the slider 7 is disengaged from the inner flange 11 </ b> A of the engaging member 11. It contacts the rear edge 4F of the sliding groove 4C. That is, the slider 7 moves backward by a distance L2 with respect to the connector 4. Then, the core 6 protrudes from the tip of the slider 7 by a distance of (L2−L1 = L3) to be in the state of FIG. Further, the coupling tool 4 and the slider 7 are moved back together, and the outer collar 4E of the coupling tool 4 comes into contact with the inner stage 9A of the shaft tube 9 to return to the state shown in FIG.

  Therefore, in the knock type mechanical pencil of Example 1, the lead 6 is pressed against the paper surface in the state of FIG. 3 without affecting the wear of the lead 6 and without affecting the length of the lead 6 protruding from the slider 7. As a result, the front end of the slider 7 and the front end of the core 6 coincide. Therefore, in the state of FIG. 6, the lead 6 can always be protruded from the tip of the slider 7 by the length of L3, and the user does not need to adjust the protruding length of the lead 6 each time the lead 6 is extended.

  Further, when the writing is finished and the protruding core 6 is returned into the slider 7, a small knock is made to advance the chuck 1 and the connector 4 is advanced, and the front end of the connector 4 is locked to the tip member 10. It contacts the step 10B. Further, a small knocking operation is performed, and the chuck 1 moves forward in the connector 4 to expand the chuck 1. When the chuck 1 comes into contact with the slider 7, the core 6 is pressed against the paper surface so that the core 6 is immersed in the slider 7 to obtain the state shown in FIG. 7. When the small knocking is finished, the slider 7 moves backward together with the chuck 1, and when the outer flange 4E of the connecting tool 4 comes into contact with the inner stage 9A of the shaft tube 9, the connecting tool 4 and the slider 7 stop, but the chuck 1 further moves backward. Since the head 1A of the chuck 1 is pressed by the fastener 2 and the chuck 1 is closed, the core 6 does not protrude from the tip of the slider 7 and is in a portable state.

  Hereinafter, based on FIG. 8, the knock type mechanical pencil of Example 2 in this invention is demonstrated. In addition, the same member as FIG. 1 attaches | subjects the same code | symbol, and abbreviate | omits the description. The connector is divided into a front member 14 and a rear member 15, and the front member 14 and the rear member 15 are press-fitted and fixed integrally.

  Hereinafter, based on FIG.9, FIG10 and FIG.11, the knock type mechanical pencil of Example 3 in this invention is demonstrated. In addition, the same member as FIG. 1 attaches | subjects the same code | symbol, and abbreviate | omits the description. First, as shown in FIG. 10, an elastic piece 107D is formed in the rear portion of the slider 107 by two kerfs 107C extending forward from the rear end, and the elastic piece 107D is configured in a relative position. Further, an engagement protrusion 107A protruding outward is formed on each elastic piece 107D. In addition, a lead holder 8 that holds the lead 6 with a force of about 10 g is built in the front portion of the slider 107. The engaging projection 107A of the slider 107 is loosely fitted in a sliding groove 104C formed through the front portion of the connecting member 104, so that the connecting member 104 and the slider 107 cannot rotate but can slide in the longitudinal direction. Connected to

  The connecting tool 104 and the slider 107 including the chuck 1 and the fastener 2 are inserted from the front of the shaft tube 9. Further, the tip member 110 is detachably screwed onto the front portion of the shaft tube 9. A concave groove 110C extending circumferentially is formed on the inner surface of the tip member 110, and is configured to be able to engage with the engaging protrusion 107A of the slider 107 with a force of about 50 g. The recessed groove 110 </ b> C and the engaging protrusion 107 </ b> A constitute an engaging portion between the tip member 110 and the slider 107. Further, the return spring 12 is attached between the rear inner stage 110D of the tip member 110 and the outer collar 104E of the connector 104 with a load at the time of attachment of about 200 g, and urges the connector 104 rearward in the longitudinal direction. Further, a front spring 13 having a load of about 20 g is attached between the inner step 110A of the tip member 110 and the step portion 107B of the slider 107, and the slider 107 is urged rearward in the longitudinal direction to engage the slider 107. The protrusion 107A presses against the inner surface of the tip member 110 and the elastic piece 107D bends inward, and the engagement protrusion 107A of the slider 107 abuts on the rear edge 104F of the sliding groove 104C of the connector 104, as shown in FIG. A knock type mechanical pencil is constructed.

  In the writing state of FIG. 9, when writing is performed and the lead 6 is worn, a knocking operation is performed to push the lead tank 3 and advance the chuck 1. Then, since the load at the time of attachment of the chuck spring 5 is larger than that of the return spring 12, the coupler 104 moves forward together with the chuck 1. Further, the slider 107 is moved forward by being pushed by the connector 104. Then, the engaging protrusion 107 </ b> A of the slider 107 engages with the concave groove 110 </ b> C of the tip member 110, and the front end of the connector 104 comes into contact with the locking step 110 </ b> B of the tip member 110. Further, when the chuck 1 is advanced, the core 6 is fed out by the distance that the fastener 2 has advanced in the concave groove 104A of the connector 104, and then the head 1A of the chuck 1 is disengaged from the fastener 2 and expands. At the same time, the front end of the chuck 1 comes into contact with the rear end of the slider 107 and the advance of the chuck 1 is stopped. In this state, the core 6 protrudes from the tip of the slider 107. However, when the core 6 is pressed against the paper surface or the like, the core 6 is immersed in the slider 107 and the state shown in FIG.

  Next, when the pressing of the chuck 1 is stopped, the chuck 1 moves backward, the head 1A of the chuck 1 is pressed by the fastener 2, the chuck 1 is closed, and the core 6 is held again.

  Then, since the engaging protrusion 107A is engaged with the concave groove 110C of the tip member 110, the connecting member 104 urged rearward by the return spring 12 moves backward in the slider 107, and the sliding groove 104C of the connecting member 104 is retracted. The front end edge 104 </ b> G contacts the engaging protrusion 107 </ b> A of the slider 107. In this state, the core 6 is slightly immersed from the tip of the slider 107.

  Further, when the connecting tool 104 is moved rearward by the return spring 12, the slider 107 moves backward together with the connecting tool 104, and the engaging protrusion 107 </ b> A of the slider 107 is disengaged from the concave groove 110 </ b> C of the tip member 110 and the connecting tool 104 slides. It abuts on the rear end edge 104F of the moving groove 104C. Further, the coupling tool 104 and the slider 107 are moved backward in conjunction with each other, and the outer rod 104E of the coupling tool 104 comes into contact with the inner stage 9A of the shaft tube 9 to return to the state shown in FIG.

  Therefore, in the knock type mechanical pencil of Example 3, the lead 6 is pressed against the paper surface in the state of FIG. 11 without affecting the wear of the lead 6 and without affecting the length of the lead 6 protruding from the slider 107. As a result, the tip of the slider 107 and the front end of the core 6 coincide. Further, in the writing state after knocking, the lead 6 can always be protruded from the tip of the slider 107 by the same length, and the user does not need to adjust the protruding length of the lead 6 each time the lead 6 is unwound.

  Further, when the writing is finished and the protruding core 6 is returned into the slider 107, a small knock is made to advance the chuck 1 and the connection tool 104 is advanced, and the front end of the connection tool 104 is locked to the tip member 110. Abuts on step 110B. Further, a small knocking operation is performed, and the chuck 1 moves forward in the coupling tool 104 to expand the chuck 1. Then, when the chuck 1 comes into contact with the slider 107, the core 6 is pressed against the paper surface so that the core 6 is immersed in the slider 107 to obtain the state shown in FIG. When the small knocking is finished, the slider 107 moves backward together with the chuck 1, and when the outer flange 104E of the coupling member 104 contacts the inner stage 9A of the shaft tube 9, the coupling member 104 and the slider 107 stop, but the chuck 1 further moves backward. Since the head 1A of the chuck 1 is pressed by the fastener 2 and the chuck 1 is closed, the core 6 does not protrude from the tip of the slider 107 and is in a portable state.

  Hereinafter, the knock type mechanical pencil according to the fourth embodiment of the present invention will be described with reference to FIGS. 13, 14, and 15. In addition, the same member as FIG. 1 attaches | subjects the same code | symbol, and abbreviate | omits the description. In the knock type mechanical pencil of the fourth embodiment, the protruding amount of the core 6 after knocking can be adjusted to the length desired by the user by moving the piece 16 back and forth. If the piece 16 is moved forward with respect to the slider 207, the protruding amount of the lead 6 increases, and if the piece 16 is moved backward, the protruding amount of the lead 6 decreases. First, the writing state of FIG. 13 will be described. A penetrating slide groove 204 </ b> C is formed at a relative position in the front portion of the connector 204. The sliding groove 204C is configured to be longer in the rear in the longitudinal direction than the sliding groove 4C of the connector 4 of the first embodiment. Further, an engaging groove 204D narrower than the sliding groove 204C is continuously formed at the front part of each sliding groove 204C of the connector 204.

  Two engaging projections 207A projecting outward are formed at the relative positions on the rear portion of the slider 207. A male screw portion 207E is formed on the outer surface of the front portion of the slider 207, and a lead holder 8 for holding the lead 6 with a force of about 10 g is built in the front portion of the slider 207. The engagement protrusion 207A of the slider 207 is inserted into the slide groove 204C through the engagement groove 204D of the connection tool 204, so that the connection tool 204 and the slider 207 cannot rotate and can slide in the longitudinal direction. Connected.

  The connecting tool 204 and the slider 207 including the chuck 1 and the fastener 2 are inserted from the front of the shaft tube 9. Further, the tip member 210 is detachably screwed to the front portion of the shaft tube 9 and attached. The tip member 210 incorporates the engaging member 11, and the return spring 12 is attached between the engaging member 11 and the outer flange 204 </ b> E of the connecting member 204 with a load of about 200 g. The piece 16 is screwed into the male screw portion 207E of the slider 207, and the rear portion of the piece 16 is fitted to the front portion 210E of the tip member 210 so as to be slidable in the longitudinal direction. Further, a front spring 13 having a load of about 20 g is attached between the inner step 210A of the tip member 210 and the step portion 207B of the slider 207, and the slider 207 is urged rearward in the longitudinal direction to be screwed onto the slider 207. The rear end of the joined piece 16 is brought into contact with the outer stage 210F of the tip member 210 to form a knock type mechanical pencil.

  In the writing state of FIG. 13, when the lead tank 3 is pressed to advance the chuck 1, the load at the time of attaching the chuck spring 5 is larger than the return spring 12, so that the coupler 204 moves forward together with the chuck 1. Further, the slider 207 advances by being pushed by the connector 204. Then, the engaging protrusion 207A of the slider 207 passes through the inner collar 11A of the engaging member 11, and the front end of the connector 204 comes into contact with the locking step 210B of the tip member 210. Therefore, the engagement protrusion 207 </ b> A of the slider 207 is engaged with the inner collar 11 </ b> A of the engagement member 11. Further, when the chuck 1 is advanced, the core 6 is fed out by the distance that the fastener 2 has advanced in the concave groove 204A of the connector 204, and then the head 1A of the chuck 1 is detached from the fastener 2 and expands. At the same time, the front end of the chuck 1 comes into contact with the rear end of the slider 207 and the advance of the chuck 1 is stopped. In this state, the core 6 protrudes from the tip of the slider 207. However, when the core 6 is pressed against the paper surface or the like, the core 6 enters the slider 207 and the state shown in FIG.

  In this state, the piece 16 is moved forward to increase the amount of protrusion of the lead 6, and the piece 16 is moved backward to reduce the amount of protrusion of the lead 6.

  Next, when the pressing of the chuck 1 is stopped, the chuck 1 moves backward, the head 1A of the chuck 1 is pressed by the fastener 2, the chuck 1 is closed, and the core 6 is held again. Then, since the engaging projection 207 </ b> A is engaged with the inner flange 11 </ b> A of the engaging member 11, the connecting member 204 urged rearward by the return spring 12 moves backward in the slider 207, and the sliding groove of the connecting member 204 is retracted. The front end edge 204G of 204C abuts on the engaging protrusion 207A of the slider 207, and the state shown in FIG.

  Further, when the connecting tool 204 is moved rearward by the return spring 12, the slider 207 moves backward together with the connecting tool 204, and the engaging projection 207 </ b> A of the slider 207 moves away from the inner flange 11 </ b> A of the engaging member 11. Then, the outer flange 204E of the connector 204 comes into contact with the inner stage 9A of the shaft tube 9, and the rear end of the piece 16 screwed into the slider 207 comes into contact with the outer stage 210F of the tip member 210, so that the state shown in FIG. Return.

  In the knock type mechanical pencil of the fourth embodiment, the protruding amount of the core 6 after knocking can be adjusted to the length desired by the user, and the practical effect is enhanced. Further, the operation of finishing writing and returning the lead 6 into the slider 207 is performed by performing a small knocking operation and pressing the lead against the paper as in the first embodiment.

  The present invention is not limited to the above-described embodiments, and the members such as the shaft tube, the core tank, the coupling tool, the chuck, the tip member, and the slider can be configured by fixing and integrating a plurality of members. is there. Further, the core holder may be configured by integrally forming an elastic piece on the slider.

  It is possible to write with a certain amount of lead protruding from the tip with a single knock operation, and it can be applied to a knock-type mechanical pencil that inserts the lead into the slider with a small knock operation.

DESCRIPTION OF SYMBOLS 1 Chuck 1A Chuck 1 head 2 Clamping tool 3 Core tank 4 Connecting tool 4A Recessed groove of connecting tool 4 5 Chuck spring 6 Core 7 Slider 8 Core holder 9 Shaft cylinder 10 Tip member 12 Return spring 13 Front spring 104 Connecting tool 104A Concave groove 107 of the coupling tool 107 Slider 110 Tip member 204 Coupling tool 204A Concave groove 207 of the joint tool 204

Claims (1)

  A fastener is externally fitted to the chuck head, and the fastener is loosely fitted in the groove of the coupler so as to be movable in the longitudinal direction as appropriate. A core tank is fixed to the rear part of the chuck, and between the coupler and the core tank. A chuck spring is attached to the chuck, the chuck head is pressed by the clamp, the clamp is pressed by the connector, the chuck is closed and the core is held, and the slider can be moved in the connector in the longitudinal direction by a certain distance. The connecting tool and the slider are configured to be movable in the longitudinal direction with respect to the tip member engaged and connected to the shaft cylinder, and the connecting tool is urged rearward in the longitudinal direction by a return spring having a load that is weaker than that of the chuck spring. The engagement portion provided on the tip member and the engagement portion provided on the slider can be engaged with a force weaker than the load when the return spring is attached, and the load when the attachment is weaker than the engagement force between the tip member and the slider. Ahead The slider is urged backward in the longitudinal direction by a front spring provided in the material, and the lead holder provided on the slider holds the lead with a holding force weaker than the load at the time of mounting the front spring. Knock mechanical pencil.

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