JP6645916B2 - mechanical pencil - Google Patents

Description

  The present invention relates to a mechanical pencil capable of writing by drawing out a writing lead from a tip of a base by a predetermined amount by a knocking operation or the like.

  Conventionally, there has been a problem that, when writing with a mechanical pencil, when a high writing pressure is applied to the writing core, the writing core exposed from the tip of the base is easily broken. If the writing pressure is constant, the writing lead can be broken as the angle between the axis of the barrel of the mechanical pencil and the paper surface becomes smaller (as the barrel is laid down), or the writing lead exposed from the tip of the base. This is more noticeable as the length becomes longer.

  To solve such a problem, Patent Document 1 (Japanese Patent Application Laid-Open No. 2015-123689) discloses that when a high writing pressure is applied to a writing core, an axial component of the writing pressure and a component perpendicular to the axial direction of the writing pressure are applied. There is described a mechanical pencil that absorbs components by different mechanisms to reduce breakage of a writing lead.

Specifically, in the mechanical pencil disclosed in Patent Document 1, a base is supported on a shaft cylinder via an elastic body (coil spring), and the base has a cam slope having a gradually decreasing diameter toward the rear in the axial direction. ing. Further, a pressing portion that presses the cam slope to the front in the axial direction is formed in the shaft cylinder. With such a configuration, the cam slope of the mouthpiece is pressed forward in the axial direction by the pressing portion of the barrel, due to a component of the writing pressure perpendicular to the axial direction (force in the direction outside the barrel diameter). The base slides forward (protrudes) from the tip of. As a result, the length of the writing core exposed from the tip of the base is reduced.
Further, in the mechanical pencil disclosed in Patent Document 1, the lead-out unit that feeds out a writing lead is axially moved relative to each other in a state in which the lead-out unit that feeds out the writing lead is urged axially forward (in the axial direction toward the tip of the base) by an elastic body (coil spring). It is supported by the shaft cylinder as much as possible. Then, the lead-out unit including the writing lead relatively moves rearward in the axial direction with respect to the barrel, whereby the axial component of the writing pressure is absorbed. As a result, the length of the writing lead exposed from the tip of the base is further reduced, and the breakage of the writing lead is reduced.

JP 2015-123689

  In the mechanical pencil described in Patent Literature 1, when a high writing pressure is applied to a writing core, the base is at a stroke over a maximum length (stroke) in which the base can slide forward with respect to the barrel. It slides (pops out).

On the other hand, the present inventor has developed a configuration in which the writing lead slides backward with respect to the base when high writing pressure is applied to the writing lead, and such a configuration provides a smoother writing feeling. It was confirmed that there were many users who felt that
Further, when the writing lead is broken in the lead-out unit, the user needs to be able to perform maintenance, and it has been required to easily attach and detach small components constituting the lead-out unit.

  The present invention is based on the above findings, and its purpose is to reliably avoid breakage of the writing lead when high writing pressure is applied to the writing lead, and to achieve a smooth writing feeling. And to provide a mechanical pencil with excellent maintainability.

The present invention
"With the barrel,
A core feeding unit for feeding a writing lead, wherein a rear area is supported in the barrel so that a front area can be tilted in the barrel,
A circular flange provided on the outer peripheral surface of the front area of the core feeding unit,
A protrusion provided on an inner peripheral surface axially rearward of the flange of the barrel,
A stretchable elastic body arranged in a compressed state between the flange and the protrusion,
With
The core feeding unit,
A base through which the writing core is inserted so as to be able to move back and forth,
A front cylinder member having a pressed portion on the outer peripheral surface,
A rear cylinder member provided with the flange having a larger diameter than the elastic body and having a plurality of grooves arranged radially outwardly and rearwardly,
With
A female screw provided on the front cylinder member and a male screw provided on the rear cylinder member are screwed together,
The back of the base is housed in the front cylinder member,
The barrel has a pressing portion in a front region,
At least one of the pressing portion and the pressed portion is a tapered surface that gradually increases in diameter rearward in the axial direction,
Before the front region of the core feeding unit tilts in the barrel, the pressing portion and the pressed portion are in contact with each other, and the front region of the core feeding unit tilts in the barrel. In this case, the front end edge of the flange abuts against the inner surface of the barrel, and the pressing portion moves the pressed portion relative to the barrel in the axial rearward direction. Mechanical pencil. ".

According to the present invention, when a high writing pressure is applied to the writing lead, the front area of the lead-out unit is tilted in the barrel by a component perpendicular to the axial direction of the writing pressure. Thus, the lead-out unit including the writing lead is moved relatively rearward in the axial direction with respect to the shaft cylinder against the urging force of the elastic body, so that the length of the writing lead exposed from the tip of the base is reduced. You. Further, the lead-out unit including the writing lead is further moved axially rearward with respect to the shaft cylinder against the urging force of the elastic body by the axial component of the writing pressure, and is exposed from the tip of the base. The wick length is further reduced. Thus, when a high writing pressure is applied to the writing lead, breakage of the writing lead can be reliably avoided. Also, at this time, instead of the base being relatively moved axially forward (projecting out) with respect to the barrel, the core feeding unit including the writing core is relatively moved axially rearward with respect to the base, The length of the writing core exposed from the base is reduced. This makes it possible to provide a mechanical pencil with a smooth writing feel.
When the writing core is broken in the base, the writing core broken in the base can be removed by unscrewing the front cylinder member and the rear cylinder member in the core feeding unit. The front cylinder member and the rear cylinder member of the core feeding unit disposed in the shaft cylinder are small parts, and an elastic body is in contact with the rear of the flange of the rear cylinder member, but the flange has a larger diameter than the elastic body. With the provision of a plurality of radially arranged grooves that are open outwardly and rearwardly, when the user screws the front cylinder member and the rear cylinder member or removes the screwing, Since the front cylinder member and the rear cylinder member are pinched from behind the flange, a force is applied so that the front cylinder member and the rear cylinder member approach each other. A mechanical pencil that can be easily removed and has high maintainability can be obtained.

  Preferably, the pressed portion of the core feeding unit is the tapered surface, and the tapered surface has any angle between 20 ° and 60 ° with respect to the axial direction of the barrel. The elastic body is a coil spring, and a load required to move the pressed portion relative to the axial cylinder rearward in the axial direction against the urging force of the coil spring is 0.5N to 8N. Any value between.

  In this case, when a high writing pressure is applied to the writing core, the core feeding unit including the writing core can be reliably moved relative to the axial cylinder rearward in the axial direction, so that breakage of the writing core is reliably avoided. You. On the other hand, when an appropriate writing pressure is applied to the writing lead, the lead feeding unit including the writing lead is not substantially moved relative to the axial cylinder rearward in the axial direction, so that writing quality is not spoiled.

  The mechanical pencil as described above is preferably disposed in a tip end region of the lead-out unit, and further includes a base that can move relative to the lead-out unit in the axial direction of the barrel. A core feeding unit body whose front end is surrounded by the base; and a holding member for holding the base in the core feeding unit body in a retaining state.

  In this case, at the time of assembling or disassembling the mechanical pencil, the base does not undesirably fall out of the lead-out unit, so that workability is good.

According to the present invention, when a high writing pressure is applied to the writing lead, a component perpendicular to the axial direction of the writing pressure causes the front region of the lead-out unit to tilt in the barrel. Thereby, the lead-out unit including the writing lead is moved axially rearward relative to the barrel against the urging force of the elastic body, so that the length of the writing lead exposed from the tip of the base is reduced. You. Further, the writing component including the writing core is further moved axially rearward with respect to the shaft cylinder against the urging force of the elastic body by the axial component of the writing pressure, and the writing unit exposed from the tip of the base. The wick length is further reduced. Thus, when a high writing pressure is applied to the writing lead, breakage of the writing lead can be reliably avoided. Also, at this time, instead of the base being relatively moved axially forward (projecting out) with respect to the barrel, the core feeding unit including the writing core is relatively moved axially rearward with respect to the base, The length of the writing core exposed from the base is reduced. This makes it possible to provide a mechanical pencil with a smooth writing feel.
When the writing core is broken in the base, the writing core broken in the base can be removed by unscrewing the front cylinder member and the rear cylinder member in the core feeding unit. The front cylinder member and the rear cylinder member of the core feeding unit disposed in the shaft cylinder are small parts, and an elastic body is in contact with the rear of the flange of the rear cylinder member, but the flange has a larger diameter than the elastic body. With the provision of a plurality of radially arranged grooves that are open outwardly and rearwardly, when the user screws the front cylinder member and the rear cylinder member or removes the screwing, Since the front cylinder member and the rear cylinder member are pinched from behind, a force is applied so that the front cylinder member and the rear cylinder member approach each other. In this state, a force in the rotational direction is applied, so that the front cylinder member and the rear cylinder member are attached to each other. It is possible to provide a mechanical pencil that can be easily removed and has high maintainability.

1 is a schematic longitudinal sectional view of a mechanical pencil according to an embodiment of the present invention. FIG. 2 is a schematic vertical sectional view of a front region of the mechanical pencil of FIG. 1 when no writing pressure is applied to the writing core. FIG. 2 is a schematic longitudinal sectional view of a front region of the mechanical pencil of FIG. 1 when writing pressure is applied to a writing core. FIG. 2 is a perspective view of a lead-out unit in the mechanical pencil of FIG. 1. FIG. 5 is a perspective view of the lead-out unit in a state where a writing lead broken in a base is removed.

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

  FIG. 1 is a schematic longitudinal sectional view of a mechanical pencil 100 according to a first embodiment of the present invention, and FIG. 2 is a schematic view of the mechanical pencil 100 of FIG. 1 when no writing pressure is applied to the writing lead 70. FIG. 3 is a schematic longitudinal sectional view of the front region of the mechanical pencil 100 of FIG. 1 when a writing pressure is applied to the writing lead 70.

  As shown in FIGS. 1 to 3, the mechanical pencil 100 according to the present embodiment includes a barrel 10 and a writing lead 70 supported in the barrel 10 and having a front region tiltable in the barrel 10. And a core feeding unit 40 for feeding. The barrel 10 of the present embodiment is made of polycarbonate, and includes a rear shaft 20 and a front shaft 30 whose rear region is fixed (screwed) to a front region of the rear shaft 20.

  The core feeding unit 40 according to the present embodiment is fixed to the front end of the core pipe 41 via a connector 49 with a polypropylene core pipe 41 extending in the axis direction of the axis cylinder 10 inside the axis cylinder 10. A brass chuck 43, a brass fastening ring 42 externally fitted to the front region of the chuck 43, an outer cylinder 45 surrounding the chuck 43, and a core pipe 41 attached axially rearward to the outer cylinder 45. And a return spring 44 for biasing.

  Specifically, as shown in FIGS. 2 and 3, the outer cylinder 45 supports the chuck 43 on the inner peripheral surface of the front region and has a rear cylinder member 45a having a flange 45c on the outer peripheral surface of the rear region. A front cylinder member 45b that is screwed to the front end region of the cylinder member 45a and extends axially forward beyond the front end of the chuck 43. The rear cylinder member 45a has an inner flange 45d at the front end, and a return spring 44 is arranged in a compressed state between the inner flange 45d and the connector 49. The core pipe 41 is urged rearward in the axial direction. In this state, the chuck 43 is clamped by the clamping ring 42 so as to clamp the writing lead 70 so as not to retreat.

  The shaft cylinder 10 (rear shaft 20) has a protrusion 21 on the inner peripheral surface axially rearward of the flange 45c of the outer cylinder 45, and extends and contracts between the protrusion 21 and the flange 45c. A possible coil spring 60 is arranged in a compressed state. With such a configuration, the lead-out unit 40 including the writing lead 70 can move relative to the axial cylinder 10 rearward in the axial direction against the urging force of the coil spring 60.

  The outer diameter of the flange 45c is larger than the outer diameter of the coil spring 60, and the inner diameter of the rear region of the front shaft 30 is larger than the outer diameter of the flange 45c. A gap is formed between the flange and the outer peripheral surface of the flange 45c. Thus, the tilting of the core feeding unit 40 with respect to the barrel 10 is allowed. The front end edge 45e of the flange 45c is in contact with the rear end of the rear cylinder member 45a, and when the core feeding unit 40 is tilted, the circular front end edge 45e of the flange 45c is attached to the inner peripheral surface of the front shaft 30. Abut The flange 45c is formed with a plurality of radial grooves 45f that are open outward and rearward. Since the grooves 45f are not on the front edge 45e side of the flange 45c, they are formed on the inner peripheral surface of the front shaft 30. On the other hand, the flange 45c can uniformly contact.

  Further, a ferrule 52 made of brass is attached to a distal end region of the core feeding unit 40. The base 52 according to the present embodiment is arranged in the distal end region of the core feeding unit 40 and is relatively movable with respect to the core feeding unit 40 in the axial direction of the barrel 10. As shown in FIGS. 2 and 3, the base 52 includes a cylindrical front region 52 a for guiding the writing lead 70 and a sleeve-shaped rear region 52 b having a larger diameter than the front region 52 a. . The rear region 52b has a front small diameter portion 52c and a rear large diameter portion 52d, and the small diameter portion 52c and the large diameter portion 52d are connected by a shoulder 52e.

  The base 52 is held by a front cylinder member 45b and a cylindrical holding member 40b internally fitted and fixed to the front cylinder member 45b in a state in which the base 52 is prevented from slipping off and slidable in the axial direction of the barrel 10, and the core feeding unit main body. It is attached to the tip region of 40a. Specifically, as shown in FIGS. 2 and 3, the front cylinder member 45 b includes a cylindrical main body 45 g surrounding a rear area 52 b of the base 52, and a female screw formed in a rear end area of the main body 45 g. And a portion 45h. The female screw portion 45h is screwed to a male screw portion 45i formed in a front end region of the rear cylinder member 45a, and the front cylinder member 45b, the rear cylinder member 45a, and the holding member 40b are integrally formed. . The holding member 40b has an abutment step 40c on the inner peripheral surface axially forward of the tightening ring 42 to regulate the advance of the tightening ring 42 on the way. The base 52 is held so that the rear region 52b is slidable in the axial direction inside the front cylinder member 45b, so that undesired falling off from the front cylinder member 45b is prevented. In this state, the expandable and contractible coil spring 55 is disposed in a compressed state between the stepped portion 52f formed at the center of the enlarged diameter portion 52d of the base 52 and the shoulder 40d of the holding member 40b. The front end of the front cylinder member 45b is an opening having a flange 33, and a front region 52a of the base 52 protrudes forward from this opening. With such a configuration, even when the lead-out unit 40 is relatively moved axially rearward with respect to the barrel 10, the resilient force of the coil spring 55 causes the base 52 and the inner flange 33 of the barrel 10 to contact each other. The contact state is maintained. Thus, when the lead-out unit 40 including the writing lead 70 is relatively moved axially rearward with respect to the barrel 10, the length of the writing lead 70 exposed from the front end of the base 52 is reduced. It has become.

  The front cylinder member 45b has a pressed portion 53 at the front end. The pressed portion 53 of the present embodiment is configured as a tapered surface having an angle of 40 ° with respect to the axial direction of the barrel 10. Further, the barrel 10 (the front shaft 30) has a pressing portion 32 that protrudes on the inner peripheral surface in the front region. In the present embodiment, as shown in FIG. 2, before the core feeding unit 40 is tilted, the pressing portion 32 and the pressed portion 53 are in contact with each other. Then, as shown in FIG. 3, when the core feeding unit 40 is tilted, the pressing portion 32 moves the pressed portion 53 relative to the shaft cylinder 10 in the axial rearward direction. In the present embodiment, the spring constant of the coil spring 60 is 1600 N / m, and the pressed portion 53 (tapered surface) is moved relative to the shaft cylinder 10 rearward in the axial direction against the urging force of the coil spring 60. The load required for this is 5.0N. The spring constant of the coil spring 55 is 1000 N / m, and by setting the urging force of the coil spring 55 smaller than the urging force of the coil spring 60, the outer cylinder 45 shown in FIG. Until the cylinder 45 starts to move, the contact state between the base 52 and the inner flange 33 of the shaft cylinder 10 is maintained.

  As shown in FIG. 1, the core feeding unit 40 further includes a knock portion 48 attached to the rear end of the core pipe 41 to press the core pipe 41 axially forward with respect to the outer cylinder 45. are doing. The knock portion 48 of the present embodiment has a sleeve portion 48a that is externally fitted to the rear end region of the core pipe 41 at the front in the axial direction, and makes it possible to remove the cylindrical eraser 80 at the rear in the axial direction. It has a holder 48b for holding. The internal space of the sleeve portion 48a and the internal space of the holder portion 48b are connected by an opening. Thus, by removing the eraser 80 from the holder portion 48b, the writing lead 70 can be put into the lead holder 41 from the opening. A dome-shaped knob 81 that covers the rear of the eraser 80 is detachably fitted to the holder 48b.

  Furthermore, in the present embodiment, a crown 23 is fixed to the rear end region of the rear shaft 20. A step portion 23a facing rearward in the axial direction is formed on the inner peripheral surface of the crown 23. Further, a flange portion 48c is formed on the outer periphery of the holder portion 48b, and a stretchable spring 48d is arranged in a compressed state between the flange portion 48c and the step portion 23a.

  Next, the operation of the mechanical pencil 100 according to the embodiment of the present invention will be described.

  First, prior to writing on the paper surface, the knob 81 and the eraser 80 are removed from the holder 48b as necessary, and the writing core 70 is inserted through an opening communicating the sleeve 48a and the holder 48b. It is put into the core pipe 41. Then, the eraser 80 and the knob 81 are attached to the holder portion 48b, and the knock portion 48 (knob 81) is pressed (knocked) forward in the axial direction with the front end of the mouthpiece 52 turned downward. Thus, the core pipe 41, the connector 49, the chuck 43, and the tightening ring 42 are advanced against the urging force of the return spring 44. During this forward movement, only the tightening ring 42 comes into contact with the contact step 40c formed on the front cylinder member 45b of the outer cylinder 45. As a result, the fastening ring 42 is removed from the chuck 43 rearward, the chuck 43 is opened, and the writing lead 70 is extended. At the time of pressing (knocking), an appropriate resistance is provided by the urging force of the spring 48d disposed between the flange portion 48c of the knocking portion 48 and the step portion 23a of the crown 23.

  When the pressing state of the knock portion 48 (knob 81) is released, the core pipe 41 is retracted together with the chuck 43 by the urging force of the return spring 44. Along with this, the fastening ring 42 is externally fitted to the front area of the chuck 43 again, and the chuck 43 is fastened. Thereby, the writing lead 70 is held so as not to retreat, and the state where the writing lead 70 is extended is maintained. Then, by repeating this series of pressing operations appropriately, the writing lead 70 is exposed (extended) from the tip of the base 52 to a desired length (see FIG. 2). The front shaft 30 is gripped by the user, and writing is performed by moving the barrel 10 as desired while bringing the writing lead 70 into contact with the paper surface.

  In writing, it is general that the barrel 10 is gripped so that its axial direction forms an acute angle with respect to the paper surface (see FIGS. 2 and 3). Therefore, a writing pressure including a component perpendicular to the axial direction of the barrel 10 and a component in the axial direction is applied to the writing core 70. When a high writing pressure is applied to the writing core 70 at the time of writing, the mechanical pencil 100 of the present embodiment absorbs a component of the writing pressure perpendicular to the axial direction and an axial component of the writing pressure, respectively. The exposed writing core 70 is prevented from being broken.

  Specifically, as shown in FIG. 3, the front area of the core feeding unit 40 is tilted by a component perpendicular to the axial direction of the pen pressure, and the pressed portion 32 of the front shaft member 45 b is pressed by the pressing portion 32 of the front shaft 30. Is pressed rearward in the axial direction of the shaft cylinder 10. As a result, the lead-out unit 40 including the writing lead 70 is moved axially rearward relative to the barrel 10 against the urging force of the coil spring 60. On the other hand, since the base 52 is urged axially forward by the coil spring 55 with respect to the holding member 40b, the base 52 is not moved relative to the axial cylinder 10 rearward in the axial direction. As a result, the length of the writing lead 70 exposed from the tip of the base 52 is reduced.

  At the same time, the writing lead 70 can be pressed rearward in the axial direction against the barrel 10 by the axial component of the writing pressure. Accordingly, the lead-out unit 40 including the writing lead 70 is further moved axially rearward against the urging force of the coil spring 60. That is, the length of the writing lead 70 exposed from the tip of the base 52 can be further reduced, and breakage of the writing lead 70 is avoided.

  When the writing pressure applied to the writing lead 70 is reduced, the lead-out unit 40 including the writing lead 70 is pushed back axially forward with respect to the barrel 10 by the urging force of the coil spring 60. Thus, the initial state (see FIG. 2) is restored.

  According to this embodiment as described above, when a high writing pressure is applied to the writing lead 70, the front area of the lead-out unit 40 is tilted in the barrel 10 by a component perpendicular to the axial direction of the writing pressure. You. Accordingly, the lead-out unit 40 including the writing lead 70 is moved axially rearward with respect to the barrel 10 against the urging force of the coil spring 60, so that the writing lead 70 exposed from the tip of the base 52 is moved. The length is reduced. Further, the lead-out unit 40 including the writing lead 70 is further moved axially rearward with respect to the barrel 10 against the urging force of the coil spring 60 by the axial component of the writing pressure. The length of the writing lead 70 exposed is further reduced. Thus, the breakage of the writing lead 70 when a high writing pressure is applied to the writing lead 70 is avoided. At this time, the base 52 including the writing lead 70 moves relative to the base 52 rearward in the axial direction, instead of the base 52 being relatively moved forward (moving out) relative to the barrel 10. By doing so, the length of the writing lead 70 exposed from the base 52 is reduced. Therefore, when the tip of the base 52 abuts on the paper surface, the writing core 70 exposed from the base 52 is quickly increased by the urging force of the coil spring 60 by slightly reducing the writing pressure. For this reason, it is possible to quickly eliminate the hook between the tip of the base 52 and the paper surface.

  Next, a description will be given of a state in which the writing core 70 broken inside the base 52 of the mechanical pencil 100 according to the embodiment of the present invention is removed.

  As shown in FIG. 4, the mechanical pencil 100 of the present embodiment can expose the lead-out unit 40 by releasing the screwed state between the rear shaft 20 and the front shaft 30. As shown in FIG. 5, the lead-out unit 40 releases the writing lead folded inside the base 52 (holding member 40b) by releasing the threaded state between the front tubular member 45b and the rear tubular member 45a. Can be removed. In the core feeding unit 40 of the present embodiment, since a plurality of radial grooves 45f whose outer sides and rear sides are opened are formed in the flange 45c of the rear cylinder member 45a, as shown in FIG. When screwing or unscrewing the tubular member 45b and the rear tubular member 45a, the user grips from behind the flange 45c, and as a result, as shown by arrows X and -X in FIG. A force is applied so that the front cylinder member 45b and the rear cylinder member 45a approach each other, and in this state, a force in the rotation direction indicated by the arrow Z and the arrow -Z is applied, whereby the female screw of the front cylinder member 45b is formed. The attachment and detachment of the part 45h and the male screw part 45i of the rear cylinder member 45a became easy, and a mechanical pencil with high maintainability was obtained.

10 Shaft cylinder 20 Rear shaft 21 Projecting portion 23 Crown 23a Step 30 Front shaft 32 Pressing portion 33 Flange 40 Core feeding unit 40a Core feeding unit main body 40b Holding member 40c Contact step 40d Shoulder 41 Core pipe,
42 Tightening ring 43 Chuck 44 Return spring 45 Outer cylinder 45a Rear cylinder 45b Front cylinder 45c Flange 45d Inner flange 45e Front end 45f Groove 45g Body 45h Female thread 45i Male thread 49 Connector 48 Knock 48a Sleeve 48b Holder Part 48c Flange part 48d Spring 52 Base 52a Front area 52b Back area 52c Small diameter part 52d Large diameter part 52e Shoulder part 52f Step 53 Pressed part 55 Coil spring 60 Coil spring 70 Writing core 80 Eraser 81 Knob 100 Mechanical pencil

Claims (1)

A barrel,
A core feeding unit for feeding a writing lead, wherein a rear area is supported in the barrel so that a front area can be tilted in the barrel,
A circular flange provided on the outer peripheral surface of the front area of the core feeding unit,
A protrusion provided on an inner peripheral surface axially rearward of the flange of the barrel,
A stretchable elastic body arranged in a compressed state between the flange and the protrusion,
With
The core feeding unit,
A base through which the writing core is inserted so as to be able to move back and forth,
A front cylinder member having a pressed portion on the outer peripheral surface,
A rear cylinder member provided with the flange having a larger diameter than the elastic body and having a plurality of grooves arranged radially outwardly and rearwardly,
With
A female screw provided on the front cylinder member and a male screw provided on the rear cylinder member are screwed together,
The back of the base is housed in the front cylinder member,
The barrel has a pressing portion in a front region,
At least one of the pressing portion and the pressed portion is a tapered surface that gradually increases in diameter rearward in the axial direction,
Before the front region of the core feeding unit tilts in the barrel, the pressing portion and the pressed portion are in contact with each other, and the front region of the core feeding unit tilts in the barrel. In this case, the front end edge of the flange abuts against the inner surface of the barrel, and the pressing portion moves the pressed portion relative to the barrel in the axial rearward direction. Mechanical pencil.

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