WO2012176636A1 - シャープペンシル - Google Patents
シャープペンシル Download PDFInfo
- Publication number
- WO2012176636A1 WO2012176636A1 PCT/JP2012/064840 JP2012064840W WO2012176636A1 WO 2012176636 A1 WO2012176636 A1 WO 2012176636A1 JP 2012064840 W JP2012064840 W JP 2012064840W WO 2012176636 A1 WO2012176636 A1 WO 2012176636A1
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- WO
- WIPO (PCT)
- Prior art keywords
- cam
- adjustment
- cam surface
- writing
- rotor
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43K—IMPLEMENTS FOR WRITING OR DRAWING
- B43K21/00—Propelling pencils
- B43K21/02—Writing-core feeding mechanisms
- B43K21/027—Writing-core feeding mechanisms with sliding tubelike writing-core guide
- B43K21/033—Writing-core feeding mechanisms with sliding tubelike writing-core guide with automatic feed by pressure during use of pencil
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43K—IMPLEMENTS FOR WRITING OR DRAWING
- B43K21/00—Propelling pencils
- B43K21/006—Pencil-barrels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43K—IMPLEMENTS FOR WRITING OR DRAWING
- B43K21/00—Propelling pencils
- B43K21/02—Writing-core feeding mechanisms
- B43K21/16—Writing-core feeding mechanisms with stepwise feed of writing-cores
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43K—IMPLEMENTS FOR WRITING OR DRAWING
- B43K21/00—Propelling pencils
- B43K21/02—Writing-core feeding mechanisms
- B43K21/22—Writing-cores gripping means, e.g. chucks
Definitions
- the present invention relates to a mechanical pencil capable of sequentially drawing out a writing core by using writing pressure accompanying a writing operation.
- mechanical pencils operate to knock out the writing core by a fixed amount from the spout member attached to the front end side of the barrel by knocking the knocking portion projecting to the rear end of the barrel, for example. Do. That is, in order to wear the lead along with the writing operation, it is necessary to knock the knocking portion for each constant writing operation.
- the tip of the pipe-like core guide contacts the paper surface due to the wear of the core accompanying writing, and the core guide is gradually retracted. To work. As a result, even if the amount of protrusion of the core from the tip of the mouth by a single knock operation is set to be somewhat large, the writing core is protected by the pipe-like core guide and the degree of core breakage associated with writing can be reduced. it can.
- the applicant of the present invention keeps the tip pipe gradually retracting into the tip with the wear of the core by writing, thereby maintaining the amount of projection of the writing core from the tip pipe within a certain range. It has previously been proposed a mechanical pencil that can be used, which is disclosed in US Pat.
- the tip pipe which functions as a core guide is operated to be gradually retracted into the tip of the mouth by utilizing the writing pressure applied to the writing core with writing. Therefore, since the end pipe is also retracted according to the wear of the core accompanying writing, the operation of the end pipe rubbing the paper can be avoided, and at the same time, the problem of the core breakage can be solved.
- the present invention has been made based on the above technical background, and is characterized in that it operates so that the writing core is gradually drawn out in response to the wear of the core accompanying the writing operation. It is intended to realize the feeding operation of the lead by using the writing pressure applied to the writing lead, and thereby the mechanical pencil which can keep the outgoing dimension of the writing lead from the tip pipe substantially constant, or one knock It is an object of the present invention to provide a mechanical pencil that can be written long by operation.
- a ball chuck for allowing the forward movement of the writing core and preventing the backward movement is accommodated in the barrel, and the writing core gripped by the ball chuck is
- the apparatus is characterized in that a core feeding mechanism is provided which feeds the writing core forward in response to an axial backward movement by receiving writing pressure and an axial forward movement by releasing writing pressure.
- the lead-out mechanism is fed out by an axial backward movement by writing pressure received by the writing core gripped by the ball chuck and an axial forward movement by release of the writing pressure. It has a feeding amount adjustment mechanism for adjusting the feeding amount of the core.
- the rotor is moved in one direction by receiving an axial backward movement by writing pressure received by the writing core gripped by the ball chuck and an axial forward movement by releasing the writing pressure. It is preferable to further comprise a rotary drive mechanism that is driven to rotate, and the core feeding mechanism is configured to feed the writing core forward by receiving rotational driving force of the rotor in the rotary drive mechanism.
- the above-mentioned lead-out mechanism is provided with a cam surface which ascends in the circumferential direction on an annular end face, and a cam member having a step in the axial direction between the starting point and the final point of the cam surface.
- a contact element that rotates in response to the rotational drive force of the rotor in the rotational drive mechanism and partially contacts the cam surface of the cam member, and slides on the circumferential surface of the writing core in the axial center portion
- a slider provided with a holding chuck for holding the writing core in contact therewith, wherein the contact element of the slider in contact with the cam surface of the cam member falls into the step formed in the axial direction It is desirable that the writing core held in sliding contact with the holding chuck be drawn out from the ball chuck by the forward movement.
- the feeding amount adjustment mechanism adjusts the feeding amount of the writing core by adjusting the height difference of the step.
- the cam member is a beam member having one of the starting point side and the final point side of the cam surface as a fixed end and the other as a free end
- the feeding amount adjusting mechanism has an annular end face
- An adjusting cam member having an adjusting cam surface which rises up along the circumferential direction, and an adjusting contact arranged between the cam member and the adjusting cam member and in contact with the adjusting cam surface
- the cam member is a beam-like member in which one of the starting point side and the end point side of the cam surface is a fixed end and the other is a free end
- the feed amount adjustment mechanism is The adjustment slider is attached to the cam member, and by moving the adjustment slider back and forth, the free end side of the cam member is moved back and forth to adjust the height difference of the step.
- the feed amount adjustment mechanism is configured such that the height difference of the step is adjusted by replacing the cam member.
- the fore-end portion is detachably attached to the front end portion of the shaft cylinder, and the cam member is disposed in the fore-end portion and is configured to be exchangeable with the fore-end portion.
- the writing core be rotationally driven together with the ball chuck that rotates in response to the rotational driving force of the rotor in the rotational driving mechanism.
- the ball chuck is configured to move back and forth in the axial direction by a knocking operation of a knock portion disposed in a part of the shaft cylinder, and the gripping action of the writing core by the advancement of the ball chuck and the ball chuck It is desirable that the writing core be drawn forward by the releasing action of the writing core by the backward movement of the head.
- the rotary drive mechanism preferably includes a rotor and first and second cam-forming members, and the rotor is formed in an annular shape, and the first end face and the other end face in the axial direction First and second fixed cam surfaces formed on the first and second cam-forming members so as to form second cam surfaces respectively and to face the first and second cam surfaces respectively
- the first cam surface of the rotor is brought into contact with and engaged with the first fixed cam surface by the retraction operation of the ball chuck by the writing pressure, and the rotor is released by the release of the writing pressure.
- a second cam surface in the second housing is in contact with and engaged with the second stationary cam surface, and a first cam surface on the rotor side is engaged with the first stationary cam surface
- the second cam surface on the rotor side The second fixed cam surface is set to be out of phase with one tooth of the cam in the axial direction, and the second cam surface on the rotor side is engaged with the second fixed cam surface
- the first cam surface on the rotor side and the first fixed cam surface are set to be in a phase-shifted relationship with one tooth of the cam in the axial direction.
- the writing core is drawn forward in response to an axial retracting operation by the writing pressure received by the writing core gripped by the ball chuck and an axial advancing operation by the release of the writing pressure. It is done like that. Therefore, in response to the wear of the core accompanying the writing operation, the writing core acts so as to be drawn out gradually, and in spite of the wear of the core accompanying writing, the dimension of the writing core from the tip pipe etc. is made almost constant. It is also possible to provide a near ideal pencil that can write continuously for a long time with a single knock operation.
- the lead-out mechanism includes a cam member having a cam surface rising up in the circumferential direction and a step in the axial direction, a slider including an abutment element abutting on the cam surface of the cam member, and housed in the slider
- the holding chuck acts to draw the writing core out of the ball chuck as the slider moves forward when the contact of the slider falls into the step of the cam member.
- the writing core is driven to rotate together with the ball chuck that rotates in response to the rotational driving force of the rotor in the rotational drive mechanism, whereby the writing core is gradually driven to rotate along with the writing operation.
- the lead-out mechanism has a feed-out amount adjustment mechanism for adjusting the feed-out amount of the writing lead, the writing lead due to differences in writing pressure individually different for each user and the hardness of the writing lead 4 used.
- the feed amount of the writing core 4 can be individually adjusted in accordance with the degree of wear of the sheet. According to this, it is possible to provide a mechanical pencil capable of more remarkably exhibiting the above-described effects that writing can be continued for a long time by one knock operation.
- FIG. 21 is a partially broken perspective view of the front half of the mechanism shown in FIGS. 19 and 20;
- reference numeral 1 is a barrel forming an outer shell of the mechanical pencil, that is, a tip shaft, and an inner peripheral surface of a front end portion of the tip shaft 1 It is also detachably attached by screwing 2).
- the fore-end portion 2 is configured such that the inner diameter is tapered in a stepwise manner toward the front, and the slider 3 is accommodated therein so as to be axially slidable and capable of axial rotation. .
- the slider 3 is also configured so that its outer diameter is tapered in the forward direction, and the tip 3a of the slider 3 is formed in a cylindrical shape, and is tubular at the front end of the tip 2 It is accommodated in the state which protruded from the formed hole.
- a tip pipe 5 for guiding the writing core 4 is attached to the tip 3 a of the slider 3. Further, a rubber holding chuck 6 having a through hole at its center is accommodated in the inner space of the slider 3 in the immediate vicinity of the tip 3 a, and the through hole of the holding chuck 6 is the writing core 4. It works to hold the writing core temporarily by sliding contact with the peripheral surface of the.
- An annular cam member 8 is attached in the tip portion 2 slightly behind the holding chuck 6, and the cam surface of the cam member 8 is formed on the slider 3. A state in which the armature 3b abuts is made. The relationship between the cam member 8 and the contact 3b formed on the slider 3 will be described in detail later with reference to FIGS. 7 and 8.
- a ball chuck 9 for gripping the writing core 4 is disposed.
- the ball chuck 9 is formed in a cylindrical shape and includes a fastener 10 having a tapered surface whose inner peripheral surface spreads forward, and the fastener 10 is accommodated in the fastener 10 and is provided along the axial center of the writing core 4.
- a through hole is formed, and the tip end portion is disposed between the outer peripheral surface of the chuck body 11 and the inner peripheral surface of the fastener 10, and the chuck body 11 whose tip is divided into a plurality of parts along the axial direction.
- a plurality of balls 12 An annular stopper member 13 is fitted on the inner peripheral surface of the front end of the fastener 10 to prevent the chuck body 11 from advancing further than a predetermined amount and to prevent the ball 12 from falling off. It is done.
- the ball chuck 9 contacts the ball 12 with the ball 12 so that the writing core 4 abuts on the tapered surface in the cylindrical fastener 10. It is held by the main body 11. Thereby, the backward movement of the writing core 4 is prevented.
- the chuck body 11 is not affected by the fastener 10, so the writing core 4 can be pulled forward relatively without resistance. That is, the ball chuck 9 acts to allow the forward movement of the writing core 4 and to prevent the backward movement.
- the chuck body portion 11 has an outer diameter reduced at the central portion in the longitudinal direction and is formed to a large diameter at the rear end portion.
- the large diameter portion at the rear end is configured to slide axially along the inner peripheral surface of the rear end of the slider 3.
- a coiled spring 14 is disposed so as to surround the central portion in the lengthwise direction of the chuck body 11, and the front end of the spring 14 is a step formed on the inner peripheral surface of the fastener 10. When engaged, the rear end of the spring 14 is in contact with the large diameter portion on the rear end side of the chuck body 11.
- the spring 14 acts to urge the chuck body 11 rearward by an expanding action in the axial direction, whereby the ball chuck 9 is held in a state of gripping the writing core 4. Therefore, the spring 14 is referred to as a chuck spring for convenience.
- the slider 3 is axially slidable with respect to the outer peripheral surface of the fastener 10 constituting the ball chuck 9, and the fastener 10 is formed in a cylindrical shape on the rear end side. It is fitted on and attached to the inner circumferential surface of the first relay member 16. Further, the first relay member 16 is fitted and attached to the inner peripheral surface of the second relay member 17 formed in a cylindrical shape at a substantially central portion in the length direction.
- a relay material 18 in the form of a short shaft formed of a flexible material such as a synthetic resin is connected to the inner peripheral surface of the rear end portion of the second relay member 17. Is connected to a rotational drive mechanism described later.
- the above-described second relay member 17 is formed such that its inner diameter is slightly larger on the front end side thereof, and covers the rear end of the slider 3 so as to be slidable.
- a spring 20 is accommodated in the space between the front end portion of the relay member 17 whose inner diameter is formed to be slightly larger and the first relay member 16 described above. That is, the spring 20 acts to push the slider 3 forward, and acts to abut the contact 3b of the slider 3 to the cam surface of the cam member 8 which constitutes a lead-out mechanism described later. Although this lead-out mechanism will be described in detail later, the spring 20 is referred to as a cam contact spring for convenience.
- a cylindrical body 22 provided with a through hole of the writing core 4 is slidably accommodated.
- the core case 23 is fitted and attached to the rear end of the cylindrical body 22.
- the front end of the cylindrical body 22 is the chuck body as the core case 23 moves forward by knocking operation described later. It abuts on the portion 11 and acts to push the chuck body 11 forward. Therefore, for convenience, the cylindrical body 22 is referred to as a knocking cylindrical body.
- a rear shaft 25 constituting a shaft cylinder is fitted and attached to the rear end portion of the above-described front shaft 1. Further, an outer shaft 26 integrally formed with a clip portion 26a is mounted so as to cover the outer side of the rear shaft 25, and the outer shaft 26 is a retaining ring screwed to the rear end of the rear shaft 25. Attached by 27.
- the rotational drive mechanism 29 is accommodated in the internal space of the rear shaft 25.
- the rotary drive mechanism 29 is unitized, and the rear end portion of the short shaft relay pipe 18 molded of the synthetic resin is connected to the rotary drive mechanism 29. Then, as shown in FIG. 2, the rotary drive mechanism 29 is pushed rearward by the shaft spring 30 interposed between the rear drive shaft and the rear end portion of the front shaft 1, and the diameter reduction in the rear shaft 25. The biasing force of the shaft spring 30 presses against the formed step 25a.
- the rotational drive mechanism 29 is fixed in the rear shaft 25.
- the configuration and operation of the above-mentioned rotational drive mechanism 29 will be described in detail later based on FIGS. 4 to 6.
- a knock rod 31 as a knock member is slidably attached to the rear shaft 25 in a rear end portion of the rear shaft 25, and the space between the rear shaft 25 and the knock rod 31 is knocked
- a rod return spring 32 is arranged. Further, a partition portion 31 a having a supply hole of the writing core is formed on the rear end portion of the knock bar 31 slightly.
- An eraser 33 is detachably mounted on the rear end of the knock bar 31 and a knock cover 34 covering the eraser 33 is detachably mounted on the peripheral surface of the rear end of the knock bar 31.
- a cylindrical member 35 is attached to the rear end of the lead case 23, and the partition portion 31a of the knock rod 31 pushes the cylindrical member 35 forward by knocking the knock cover 34.
- the lead case 23 also operates to move forward.
- the lead case 23 is moved forward as described above by knocking the knock cover 34.
- the knocking cylinder 22 attached to the front end of the lead case 23 advances to push the chuck body 11 forward.
- the writing core 4 gripped by the chuck main body 11 also advances, and acts so as to draw out the writing core 4 from the tip pipe 5.
- the knocking rod 31 retracts by the action of the return spring 32 and returns to the state shown in FIG.
- the writing core 4 is held by the holding chuck 6 accommodated in the slider 3, so that the action of the ball chuck is The writing core 4 is pulled out of the chuck body 11 without resistance, and maintains the state of being drawn from the tip pipe 5. Therefore, the writing core 4 can be drawn out by a predetermined amount each time the above-described knocking operation is repeated. Further, by maintaining the knock cover 34 in a knocked state, the chuck body 11 protrudes from the fastener 10 and the gripping of the core 4 is released. In this state, the writing core 4 in a state of being drawn out from the end pipe 5 can be pushed back with a fingertip or the like.
- the rotational drive mechanism 29 is accommodated in the rear shaft 25.
- the rotary drive mechanism 29 includes a rotor, and receives an axial retracting operation by writing pressure received by the writing core 4 gripped by the ball chuck 9 and an axial advancing operation by releasing the writing pressure. It acts to rotationally drive the rotor in one direction.
- the writing core 4 when the writing core 4 receives writing pressure, the chuck body 11 shown in FIGS. 1 and 3 slightly retracts, and the fastener 10 also retracts via the ball 12.
- a first relay member 16, a second relay member 17, and a relay pipe 18 are connected to the fastener 10, and the retracting operation and the advancing operation (hereinafter referred to as cushioning) of the writing core 4 when receiving writing pressure Is also transmitted to the above-mentioned rotational drive mechanism 29 via the above-mentioned respective members.
- FIG. 4 is a cross-sectional view showing the entire configuration of the rotary drive mechanism 29.
- the relay pipe 18 shown in FIG. 4 is coaxially disposed so as to cover the above-described lead case 23, and the relay pipe 18 rotates the backward movement and forward movement (cushion movement) of the writing core based on the writing operation.
- the rotational motion of the rotor in the rotational drive mechanism 29 generated by the cushioning action is transmitted to the ball chuck 9 and the slider 3 and the like via the relay pipe 18 while being transmitted to the drive mechanism 29.
- the rotary drive mechanism 29 is provided with a rotor 40 formed in a cylindrical shape, and the relay pipe 18 described above is fitted to the inner peripheral surface of the rotor 40 at the front end portion of the rotary drive mechanism 29. It is connected by.
- the rotor 40 has a large diameter portion whose diameter is slightly increased in the vicinity of the front end portion, and a first cam surface 40 a is formed on one end surface (rear end surface) of the large diameter portion.
- a second cam surface 40b is formed on the other end surface (front end surface).
- a cylindrical first cam forming member (also referred to as an upper cam forming member) 41 is disposed so as to turn the rotor 40 so as to cover the rear end side of the rotor 40.
- a cylindrical second cam forming member (also referred to as a lower cam forming member) 42 is fitted on and attached to the upper cam forming member 41 on the outer periphery of the front end portion of the upper cam forming member 41. .
- a fixed cam surface (also referred to as a first fixed cam surface) 41a is formed on the front end surface of the upper cam forming member 41 facing the first cam surface 40a of the rotor 40.
- a fixed cam surface (also referred to as a second fixed cam surface) 42a is formed on the inner surface of the front end portion of the lower cam forming member 42 opposed to the second cam surface 40b of the rotor 40.
- first and second cam surfaces 40a and 40b formed on the rotor 40 and the first fixed cam surface 41a and the second fixed cam surface 42a and the mutual action thereof are as follows. Details will be described later based on FIGS. 5 and 6.
- a cylinder member 44 is fitted on the rear end side of the upper cam forming member 41, and an insertion hole 44a through which the lead case 23 can be inserted in the rear end of the cylinder member 44. Is formed. Further, a torque canceller 45 which is cylindrically formed and movable in the axial direction is disposed in the cylinder member 44, and the front end of the inner peripheral surface of the torque canceller 45 and the rear end of the inner peripheral surface of the cylinder member 44 A coiled cushion spring 46 is mounted between them.
- the cushion spring 46 acts to bias the torque canceller 45 forward, and it is pushed by the torque canceller 45 that receives this biasing force, and the rotor 40 acts to move forward.
- the central portion of the rotational drive mechanism 29 described above is a space through which the lead case 23 passes and is separated from the lead case 23, and is united by the respective members indicated by the reference numerals 40 to 46 into a unit It is done.
- the rotor 40 in a state in which the ball chuck 9 grips the writing core 4, the rotor 40 receives the ball chuck via the relay pipe 18, the second relay member 17 and the first relay member 16. 9 and the slider 3 are rotatable around the axis.
- the rotor 40 is urged forward via the torque canceller 45 by the action of the cushion spring 46.
- FIGS. 5A to 5C and FIGS. 6D and 6E sequentially explain the basic operation of the rotation drive mechanism 29 for rotating the rotor 40 by the above-described operation.
- the reference numeral 40 schematically indicates the aforementioned rotor, and one end surface (upper surface of the drawing) is continuously sawtoothed along the circumferential direction
- the first cam surface 40a is formed in an annular shape.
- a second cam surface 40b which is also formed in a serrated shape continuously along the circumferential direction is formed in an annular shape.
- a first fixed cam surface 41a is formed in a serrated shape continuously along the circumferential direction also on the annular end face of the upper cam forming member 41
- a second fixed cam surface 42a which is continuously sawtooth-shaped along the circumferential direction is also formed on the annular end face of the lower cam forming member 42.
- the cam surfaces formed in a sawtooth shape along the circumferential direction of the two fixed cam surfaces 42a are formed such that the pitches thereof are substantially the same.
- (circle) mark drawn in the center part of the rotor 40 in FIG. 5 and FIG. 6 has shown the rotational movement state of the rotor 40. As shown in FIG.
- FIG. 5A shows the relationship between the upper cam forming member 41, the rotor 40, and the lower cam forming member 42 when the mechanical pencil is not in the writing state.
- the second cam surface 40b formed on the rotor 40 abuts against the second fixed cam surface 42a of the lower cam forming member 42 by the biasing force of the cushion spring 46 shown in FIG. It is done.
- the first cam surface 40a on the side of the rotor 40 and the first fixed cam surface 41a are set so as to be shifted by a half phase (half pitch) with respect to one tooth of the cam in the axial direction. ing.
- FIG. 5B shows an initial state in which writing pressure is applied to the writing core 4 by use of a mechanical pencil.
- the rotor 40 retracts the cushion spring 46 and retracts in the axial direction via the ball chuck 9 and the relay pipe 18 and the like. Thereby, the rotor 40 moves to the upper cam forming member 41 side.
- FIG. 5C shows a state where the writing pressure is applied to the writing core 4 by use of a mechanical pencil and the rotor 40 abuts on the upper cam forming member 41 side, and in this case, it is formed on the rotor 40
- the first cam surface 40 a is engaged with the first fixed cam surface 41 a on the upper cam forming member 41 side.
- the rotor 40 receives rotational drive corresponding to a half phase (half pitch) of one tooth of the first cam surface 40a.
- the second cam surface 40b on the rotor 40 side and the second fixed cam surface 42a are in a half phase (half pitch) with respect to one cam tooth in the axial direction. It is set to be in a misaligned relationship.
- FIG. 6D shows an initial state in which writing by the mechanical pencil is finished and writing pressure on the writing core 4 is released.
- the rotor 40 is operated by the action of the cushion spring 46 described above. Advance axially. Thereby, the rotor 40 moves to the lower cam forming member 42 side.
- FIG. 6E shows a state in which the rotor 40 is in contact with the lower cam forming member 42 by the action of the cushion spring 46 described above, and in this case, the second formed on the rotor 40.
- the cam surface 40b meshes with the second fixed cam surface 42a on the lower cam forming member 42 side.
- the rotor 40 receives again the rotational drive corresponding to the half phase (half pitch) of one tooth of the second cam surface 40b.
- the rotor 40 has the first and second cam surfaces 40a, It receives rotational drive corresponding to one tooth (one pitch) of 40b.
- the writing core 4 gripped by the ball chuck 9 via the relay pipe 18, the second relay member 17 and the first relay member 16 is also rotationally driven together with the slider 3.
- the cylindrical torque canceller 45 which pushes the rotor 40 forward by receiving the biasing force of the coiled cushion spring 46 is the front end face of the torque canceller 45 and the rotation. A slippage is generated between the rear end face of the armature 40 to prevent transmission of the rotational motion of the rotor 40 to the cushion spring 46.
- FIGS. 7 and 8 illustrate the configuration of the lead-out mechanism.
- the lead-out mechanism receives the rotational driving force of the rotor 40 in the above-mentioned rotational drive mechanism 29 and acts to draw out the writing lead 4 forward.
- 7 is a perspective view showing the front half of the mechanical pencil in a state in which the fore-end portion is removed, with a portion broken away
- FIG. 8 is a view mainly showing the cam member and the state in which the fore-end portion is removed. It is the perspective view which showed the relationship with a slider.
- the cam member 8 formed in an annular shape so as to surround the cylindrical tip portion 3a formed on the slider 3 is disposed in a state of being accommodated in the above-described fore-end portion 2.
- the cam member 8 is provided with a cam surface 8a rising in the circumferential direction on an annular end surface, and a starting point (low position) and a final point (high position) of the cam surface 8a.
- a step 8b is provided in the axial direction between the position 8) and the position 2). That is, the axial step 8b connects the starting point and the final point of the cam surface 8a.
- an axially projecting contact piece 3b is integrally formed with the slider 3 at the root portion of the cylindrical tip portion 3a of the slider 3, and the action of the cam contact spring 20 is The contact element 3 b is in contact with the cam surface 8 a of the cam member 8 under the forward movement of the slider 3.
- the rotor 40 of the rotational drive mechanism 29 gradually drives to rotate the slider 3 based on the cushioning motion of the writing core. That is, in this embodiment, the slider 3 is rotated to the right when the tip 3a of the slider 3 is viewed first. As a result, the abutment 3b formed on the slider 3 operates to rise along the cam surface 8a of the cam member 8, and along with this, the slider 3 gradually retracts in the axial direction. At this time, the writing core 4 gripped by the ball chuck 9 acts so as to be drawn out relatively from the tip pipe 5.
- the contact 3b of the slider 3 When the contact 3b of the slider 3 reaches the axial step 8b formed on the cam member 8, the contact 3b drops along the step 8b by the action of the cam contact spring 20. At that moment, the slider 3 also receives forward movement corresponding to the height difference of the step 8b. At this time, since the holding chuck 6 accommodated in the slider 3 is similarly advanced, the writing core 4 held in sliding contact with the holding chuck 6 is pulled out from the ball chuck 9.
- the lead-out mechanism which receives the rotational force from the rotary drive mechanism 29, acts to gradually draw out the writing core from the tip pipe 5 in response to the wear of the writing core 4 accompanying the writing operation. Do. Thereby, despite the wear of the core accompanying writing, it is possible to keep the dimension of the writing core from the tip pipe substantially constant, and to provide a near ideal pencil that does not lower the writing efficiency. it can.
- the degree of wear of the lead 4 accompanying writing is set to substantially match the amount of extension of the writing core 4 by the above-described lead extension mechanism, the writing core from the tip pipe 5 is It is possible to expect an ideal operation that can keep the dimensions of the constant at all times.
- the setting of the core feeding amount is slightly deviated and the feeding amount of the core 4 is made larger than the wear amount of the writing core 4, the core 4 will be protruded with the writing operation to cause a problem of core breakage. .
- the amount of extension of the core 4 is set to be slightly smaller than the amount of wear of the core 4 accompanying writing, and thus setting the amount of extension of the core in this manner makes The knock operation of can provide a mechanical pencil that can keep writing for a long time.
- the writing core 4 held by the ball chuck 9 is also rotationally driven in response to the rotational driving force of the rotor 40 in the rotational driving mechanism 29. It is possible to prevent the writing core 4 from being unevenly worn as it proceeds, and it is possible to solve the problem that the thickness of the drawn line and the density of the drawn line change greatly.
- the cam member 8 constituting the above-mentioned lead-out mechanism is housed in the spout (cut-up plastic) 2 which is detachably attached to the shaft cylinder (front shaft) 1
- the cutipler 2 and the cam member 8 are formed as separate parts.
- this cam member 8 can also be molded in one piece integrally with the cutipler 2.
- the axial direction formed in the cam member 8 Preparing the plurality of sizes of the step 8b of the second embodiment so that the user can select the different cam members 8 of the step 8b with the replacement of the cutipler 2, thereby adjusting the feeding amount of the writing core in the lead feeding mechanism. Is possible.
- the writing core 4 can be replaced by replacing the cutipler 2 in accordance with the degree of wear of the writing core due to differences in writing pressure individually different for each user and the hardness of the writing core 4 used.
- the feed amount of can be adjusted individually. According to this, it is possible to provide a mechanical pencil capable of more remarkably exhibiting the above-described effects that writing can be continued for a long time by one knock operation.
- FIGS. 9 and 10 show a second embodiment of a mechanical pencil according to the present invention.
- FIG. 9 is a cross-sectional view showing the configuration of the front half, and the portions corresponding to the respective portions in the first embodiment shown in FIGS. 1 and 3 are indicated by the same reference numerals, therefore, the details thereof The description is omitted.
- a spring 50 is disposed between the slider 3 and the ball chuck 9.
- the spring 50 has a function of pushing the slider 3 forward in the axial direction, and biases the chuck main body 11 constituting the ball chuck 9 rearward in the axial direction, and the writing core 4 is moved by the ball chuck 9. It also doubles as a gripping function. That is, in the first embodiment shown in FIG. 1 and FIG. 3, the spring 50 performs an operation which doubles as the action of the cam contact spring 20 and the chuck spring 14 and therefore the spring For convenience, 50 will be referred to as a combined spring.
- the end pipe 5 is supported by the pipe support member 51, and is constituted by a member different from the slider 3 in which the holding chuck 6 is accommodated in the axial center portion.
- the slider 3 is formed with a rod-shaped contact piece 3b that protrudes in the axial direction with respect to the main body of the slider 3. This rod-shaped contact piece 3b
- the tip end portion of the spring is configured to abut on the cam surface 8 a of the cam member 8 disposed in the tip end portion 2 by the action of the dual purpose spring 50.
- the cam member 8 in the second embodiment is provided with a cam surface 8a that rises up along the circumferential direction on an annular end surface, and the starting point (low position) and the final point (high position) of the cam surface 8a.
- the rotational drive mechanism 29 operates by the cushion operation of the writing core 4 accompanying writing, and thereby the rod-like contact element 3b formed on the slider 3 is a step.
- the contact piece 3b operates to move from the final point (high position) of the cam surface 8a to the departure point (low position).
- the holding chuck 6 disposed on the slider 3 operates so as to draw the writing core 4 out of the ball chuck 9 when the contact 3b of the slider 3 drops the steps 8c and 8d. This is the same as in the first embodiment. Therefore, also in the second embodiment shown in FIGS. 9 and 10, the same function and effect as those of the first embodiment described above can be obtained.
- the cam member 8 constituting the lead-out mechanism described above forms the step 8 b or the two-step steps 8 c and 8 d at a point where the cam surface 8 a formed on the annular end face makes a round. It can also be formed at a semicircular point on the end face of the or at a point shorter than that. This combination can be appropriately set in consideration of the number of teeth of the sawtooth cam constituting the rotary drive mechanism 29 described above, that is, the amount of rotational advance of the sawtooth cam.
- FIGS. 11 to 13 show a third embodiment of the mechanical pencil according to the present invention.
- FIG. 11 is a cross-sectional view showing the configuration of the front half
- FIG. 12 is a perspective view showing the front half partially broken
- FIG. 13 is a core feeding mechanism and the feeding amount shown in FIG.
- FIG. 6 is a perspective view showing the main parts of an adjustment mechanism 60.
- the parts corresponding to the parts in the first embodiment shown in FIGS. 1 and 3 are denoted by the same reference numerals, and thus the detailed description thereof is omitted.
- the mechanical pencil is used in combination with the lead-out mechanism described above in the first and second embodiments, and adjusts the feed amount of the writing lead by the lead-out mechanism.
- a feed amount adjustment mechanism 60 is provided.
- the feed amount adjustment mechanism 60 is similar to the first embodiment and the second embodiment in the mouth tip 2 but has an adjustment mouth tip 61 having a different shape, and an adjustment cap 62 put on the adjustment mouth tip 61. Is equipped.
- a slide hole 61a extending in the axial direction is formed in the step between the cylindrical portion at the tip and the larger-diameter cylindrical portion following the rear of the cylindrical portion at the adjustment port 61.
- the adjustment port end portion 61 includes an engagement protrusion 61 b formed in an annular shape on the outer peripheral surface of the cylindrical portion formed to have the above-described large diameter.
- the engaging protrusions 61b do not have to be formed over the entire circumference of the outer peripheral surface, and may be one or a plurality of protrusions provided at equal intervals in the circumferential direction.
- a hole is formed on the front end face of the adjustment cap 62, and a cylindrical portion at the tip of the adjustment port tip 61 protrudes from the hole.
- the adjustment cap 62 includes a cylindrical portion formed to have a small diameter and a cylindrical portion formed to have a large diameter.
- the inner peripheral surface of the large diameter cylindrical portion is provided with an engagement groove 62a annularly provided in a shape complementary to the engagement protrusion 61b of the adjustment port tip portion 61.
- the adjustment cap 62 In a state in which the adjustment cap 62 is placed on the adjustment port 61, the space between the hole on the front end face of the adjustment cap 62 and the cylindrical portion at the tip of the adjustment port 61 and the inside of the large diameter cylindrical portion The peripheral surface and the outer peripheral surface of the corresponding adjustment port portion 61 are loosely fitted. Further, the rear end face of the adjustment cap 62 lightly abuts on another step of the adjustment port end 61. Therefore, the adjustment cap 62 is rotatable about the axial direction with respect to the adjustment port end 61. The axial movement of the adjustment cap 62 is restricted by the engagement between the engagement protrusion 61 b of the adjustment port portion 61 and the engagement groove 62 a of the adjustment cap 62.
- an adjustment cam member 63 formed in an annular shape so as to surround a cylindrical portion at the tip of the adjustment port tip 61 is provided.
- An adjustment contact 66 described later is in contact with an adjustment cam surface 63 a which is a cam surface of the adjustment cam member 63.
- the adjustment cam member 63 has a shape similar to that of the cam member 8 in the first embodiment and the second embodiment. That is, the adjustment cam surface 63a is configured to be lifted up along the circumferential direction on the annular end surface, and is configured to have a starting point (low position) and a final point (high position).
- a cam base member 64 formed in an annular shape is provided inside the front end of the adjustment port tip portion 61 so as to surround the cylindrical tip portion 3 a formed on the slider 3. Further, on the rear of the cam base member 64, there is provided a cam member 65 formed in an annular shape so as to surround the cylindrical tip portion 3a similarly formed on the slider 3.
- the cam member 65 has a cam surface 65a, and the start point and the end point of the cam surface 65a are separated, but they are not separated to such an extent that the circumferential movement of the contact 3b of the slider 3 is inhibited. .
- the cam member 65 is fixed to the cam base member 64 via the connecting portion 65b at or near the starting point or the final point of the cam surface 65a. Therefore, the starting point side or the end point side of the cam surface 65a of the cam member 65 fixed to the cam base member 64 is a fixed end, and the other is a free end, and such a cam member 65 is a beam member .
- the cam member 65 is fixed to the cam base member 64 via the connecting portion 65b at the starting point of the cam surface 65a. Further, the cam member 65 is formed of a flexible material.
- the adjustment abutment 66 is an elongated member, and through the holes or cutouts provided in the slide hole 61 a of the adjustment port end 61 and the corresponding cam base member 64, the adjustment cam member 63 and the cam member 65. The two ends are in contact with each other. That is, one end of the adjustment abutment 66 abuts on the adjustment cam surface 63a of the adjustment cam member 63, and the other end is a surface opposite to the cam surface 65a of the cam member 65 and separated from the fixed end Abut.
- the length of the adjustment abutment 66 is the departure point of the cam surface 65a of the cam member 65 as shown in FIG.
- the final point are determined to be at the same height, that is, the entire cam surface 65a is on the same plane.
- the contact spring of the slider 3 is applied by the cam contact spring 20 and by the dual purpose spring 50 when applied to the second embodiment.
- 3b abuts on the cam surface 65a of the cam member 65 to bias the cam member 65 forward. Therefore, the cam member 65 is in a state of being in contact with the adjustment abutment 66 by the biasing force or the restoring force of the flexible cam member 65 itself.
- the adjustment contact 66 is biased by the cam contact spring 20 or the dual purpose spring 50.
- the cam member 65 operates to move down along the adjustment cam surface 63 a of the adjustment cam member 63 via the cam member 65 or by the resilience of the cam member 65 itself.
- the adjustment abutment 66 gradually advances axially.
- the free end side of the cam member 65 is advanced with the fixed end by the connection portion 65b as a fulcrum by the action of the cam contact spring 20 or the dual purpose spring 50 or the restoring force by the elasticity of the cam member 65 itself.
- the adjustment cap 62 continues to rotate to the right and the adjustment abutment 66 reaches the starting point of the adjustment cam member 63, as shown in FIG. 11, the entire cam surface 65a is flush with the same surface.
- the adjustment cam member 63 when the adjustment cam member 63 is rotated by rotating the adjustment cap 62, the adjustment contact 66 sliding on the adjustment cam surface 63a operates in the forward and backward direction according to the rotation.
- the free end of the cam member 65 is moved back and forth by the back and forth movement of the adjustment contact 66 to adjust the height difference of the step between the starting point and the final point of the cam surface 65a.
- the slider 3 When the cam member 65 is in the state of forming the cam surface 65 a such as lifting up, the slider 3 is retracted in the axial direction based on the cushioning action of the writing core by the writing operation, and the writing core gripped by the ball chuck 9 4 acts so as to be drawn out relatively from the tip pipe 5.
- the relative extension amount of the writing core 4 at this time is determined by the degree of inclination of the cam surface 65 a, that is, the axial position of the adjustment contact 66 according to the rotation of the adjustment cap 62.
- the contact 3b of the slider 3 reaches the final point of the cam surface 65a, the contact 3b drops along the step with the departure point by the action of the cam contact spring 20 or the dual purpose spring 50. At that moment, the slider 3 also receives forward movement corresponding to the height difference of the step. At this time, since the holding chuck 6 accommodated in the slider 3 is similarly advanced, the writing core 4 held in sliding contact with the holding chuck 6 is pulled out from the ball chuck 9.
- the feed amount of the writing core 4 of the writing core 4 at this time is determined by the height difference of the step, that is, the inclination degree of the cam surface 65a, in other words, the axial direction position of the adjustment contact 66 according to the rotation of the adjustment cap 62. Be done.
- the rotational position of the adjustment cap 62 it becomes possible to adjust the amount of extension of the writing core 4 in the center extension mechanism. If this configuration is used, the feeding amount of the writing core 4 is individually adjusted in accordance with the degree of wear of the writing core due to the difference in writing pressure and the hardness of the writing core 4 used individually for each user. can do. According to this, it is possible to provide a mechanical pencil capable of more remarkably exhibiting the above-described effects that writing can be continued for a long time by one knock operation.
- the feed amount adjustment mechanism 60 according to the third embodiment, the easy method of rotating the adjustment cap 62 without requiring the work of replacing the cam member 8 as described above in the first embodiment. By this, it becomes possible to adjust the feed amount of the writing core 4.
- the adjustable maximum feed amount of the writing core 4 by the feed amount adjusting mechanism 60 is determined by the height difference of the step between the starting point and the final point of the adjusting cam surface 63 a of the adjusting cam member 63. Therefore, writing according to the preference of all users by configuring the adjustment cam member 63 so as to have the step having a length (height) which exceeds the degree of wear of the writing core 4 which is usually assumed.
- the feed amount of the core 4 can be set.
- the feed amount of the writing core 4 may be zero.
- a scale or the like indicating the relative rotational position may be provided on the outer peripheral surface of the adjustment cap 62 so that the user can visually recognize the degree of the current feed amount.
- the adjustment cam member 63 is accommodated in the adjustment cap 62 in the embodiment shown in the figure, and is configured as a separate component from the adjustment cap 62.
- the adjustment cam member 63 can also be formed in one piece integrally with the adjustment cap 62.
- the adjustment port 61 and the cam base member 64 may be integrally formed in one piece
- the cam base member 64 and the cam member 65 may be integrally formed in one piece.
- the armature 66 may be formed integrally with one piece.
- the adjustment cam surface 63a of the adjustment cam member 63 does not have to form an annular surface that covers the entire circumference, and may be partial.
- FIGS. 14 and 15 show a fourth embodiment of the mechanical pencil according to the present invention.
- FIG. 14 is a cross-sectional view showing the configuration of the front half
- FIG. 15 is a cross-sectional view showing the configuration of the front half.
- the parts corresponding to the respective parts in the first embodiment shown in FIGS. 1 and 3 and the third embodiment shown in FIGS. 11 to 13 are indicated by the same reference numerals, and therefore the detailed description thereof is omitted. Do.
- the feed amount adjustment mechanism 70 according to the fourth embodiment does not have the adjustment cam member 63. Instead, the feed amount adjustment mechanism 70 is configured to adjust the height difference of the step between the starting point and the final point of the cam surface 65 a of the cam member 65 by sliding the adjustment cap 72 in the axial direction. Is different from the feeding amount adjustment mechanism 60 according to the third embodiment in that Therefore, the adjustment cap 72 will be referred to as an adjustment slider 72 for the sake of convenience.
- the adjustment port portion 71 is formed with a slide hole 71a in which the adjustment contact 66 slides. Further, the adjustment port leading end portion 71 is provided with an engagement protrusion 71b annularly formed on the outer peripheral surface of the cylindrical portion formed to have a large diameter, similarly to the adjustment port front end portion 61 in the third embodiment. Furthermore, a locking projection 71 c is provided on the cylindrical portion at the end of the adjustment port end portion 61. Furthermore, in order to support the outer peripheral surface of the adjustment slider 72, the adjustment port tip 71 includes an annular wall 71d formed in an annular shape. The engaging projections 71b and the locking projections 71c do not have to be formed over the entire circumference of the outer peripheral surface, and may be one or a plurality of projections provided at equal intervals in the circumferential direction.
- a hole is formed on the front end face of the adjustment slider 72, and a cylindrical portion at the tip of the adjustment port tip 71 protrudes from the hole.
- the adjustment slider 72 includes a cylindrical portion formed to have a small diameter and a cylindrical portion formed to have a large diameter.
- the inner circumferential surface of the large diameter cylindrical portion is provided with a plurality of engagement grooves 72a annularly provided in a shape complementary to the engagement protrusions 61b of the adjustment port tip portion 61.
- the adjustment slider 72 can slide in the axial direction with respect to the adjustment port 71.
- the relative position of the adjustment slider 72 in the axial direction with respect to the adjustment mouth tip 71 can be adjusted stepwise by the engagement between the engagement projection 71 b of the adjustment mouth tip 71 and the plurality of engagement grooves 72 a of the adjustment slider 72. .
- the maximum advance position of the adjustment slider 72 with respect to the adjustment tip 71 is determined by the engagement between the edge of the hole of the front end face of the adjustment tip 71 and the locking projection 71 c of the adjustment slider 72. Further, the maximum retracted position is determined by the abutment of the rear end surface of the adjustment slider 72 and another step of the adjustment port tip 71.
- the adjustable maximum amount of extension of the writing core 4 by the extension amount adjusting mechanism 70 is determined by the distance between the maximum advancing position and the maximum retracted position of the adjustment slider 72 with respect to the adjustment tip 71.
- the relative position can be adjusted steplessly by strengthening the fit between the adjustment port end 71 and the adjustment slider 72 without using the engagement protrusion 71 b and the plurality of engagement grooves 72 a. Good. This enables finer adjustment of the amount of delivery.
- Both ends of the adjustment abutment 66 abut against the adjustment slider 72 and the cam member 65 through the holes or notches provided in the slide hole 71 a of the adjustment port 71 and the corresponding cam base member 64. It is made to the state. That is, one end of the adjustment abutment 66 abuts on the inner wall of the front end portion of the adjustment slider 72, and the other end is a surface opposite to the cam surface 65a of the cam member 65 and abuts on a portion separated from the fixed end .
- the length of the adjustment abutment 66 is such that the start point and the end point of the cam surface 65a of the cam member 65 become the same height as shown in FIG. 15 when the adjustment slider 72 is at the maximum forward position. That is, it is determined that the entire cam surface 65a is coplanar.
- the adjustment slider 72 when the adjustment slider 72 is at the maximum forward position, the starting point and the final point of the cam surface 65a of the cam member 65 are at the same height, the contact 3b has the cam surface 65a. It only orbits along the same plane along. Therefore, the slider 3 does not retract in the axial direction based on the cushioning motion of the writing core by the writing operation, and therefore the extension amount of the writing core 4 is zero.
- the adjustment abutment 66 when the adjustment slider 72 is gripped while being pushed in and axially retracted, the adjustment abutment 66 is also axially retracted accordingly. At this time, the cam member 65 in contact with the other end of the adjustment contact 66 is deformed so that the free end side is retracted so as to be pushed up from below with the fixed end by the connection portion 65b as a fulcrum. As a result, the cam member 65 forms a cam surface 65a which rises like the cam surface 8a in the first embodiment and the second embodiment.
- the adjustment contact 66 is inserted via the cam contact spring 20 or the cam member 65 biased by the dual purpose spring 50. Or, it is advanced in the axial direction by the restoring force of the cam member 65 itself. At this time, the free end side of the cam member 65 is advanced with the fixed end by the connection portion 65b as a fulcrum by the action of the cam contact spring 20 or the dual purpose spring 50 or the restoring force by the elasticity of the cam member 65 itself. .
- the adjustment slider 72 is continuously pulled to reach the maximum forward position, as shown in FIG. 15, the entire cam surface 65a is flush with the same surface.
- a scale or the like indicating the relative position of the adjustment slider 72 may be provided on the outer peripheral surface of the adjustment slider 72 so that the user can visually recognize the degree of the current feed amount.
- the adjustment slider 72 is configured separately from the adjustment abutment 66 in the embodiment shown in the figure.
- the adjustment slider 72 and the adjustment abutment 66 can be integrally formed in one piece.
- the cam member 65 and the adjustment abutment 66 may be integrally formed in one piece.
- FIGS. 16 to 18 show a fifth embodiment of the mechanical pencil according to the present invention.
- FIG. 16 is a cross-sectional view showing the configuration of the front half
- FIG. 17 is a cross-sectional view showing the configuration of the front half
- FIG. It is shown by the perspective view shown.
- the parts corresponding to the respective parts in the first embodiment shown in FIGS. 1 and 3 and the third embodiment shown in FIGS. 11 to 13 are indicated by the same reference numerals, and therefore the detailed description thereof is omitted. Do.
- the mechanical pencil is used in combination with the lead-out mechanism described above in the first embodiment and the second embodiment, and adjusts the feed amount of the writing lead by the lead-out mechanism.
- a feed amount adjustment mechanism 80 is provided.
- the feed amount adjustment mechanism 80 includes an adjustment port tip 81 similar to but different in shape from the feed amount adjustment mechanism 70 according to the fourth embodiment, and an adjustment slider 82 attached to the adjustment port tip 81.
- the feed amount adjustment mechanism 80 according to the fifth embodiment does not have the adjustment cap 72 and the adjustment abutment 66, and instead, the cam surface of the cam member 65 is obtained by sliding the adjustment slider 82 in the axial direction. It differs from the feed amount adjustment mechanism 70 according to the fourth embodiment in that it is configured to directly adjust the height difference of the step between the start point and the final point of 65a.
- An adjustment slide hole 81a extending in a rectangular shape in the longitudinal direction so as to allow access to the internal cam member 65 in the adjustment mouth tip portion 81 in the cylindrical portion of the tip and the larger diameter shaped cylindrical portion continuing to the rear thereof. Is formed.
- the adjustment slider 82 is disposed through the adjustment slide hole 81 a of the adjustment port end 81, and is slidably attached to the adjustment port end 81 in the axial direction.
- a plurality of projections are provided on the outer surface of the adjustment slider 82 so that the user's finger does not slip when attached to the adjustment port tip 81, and the inner surface extends inwardly and is a cam
- a support 82a is formed to support the member 65 from the side opposite to the cam surface 65a.
- the maximum forward position and the maximum reverse position of the adjustment slider 82 with respect to the adjustment opening 81 are restricted by the shape of the adjustment slide hole 81 a of the adjustment opening 81. Specifically, when the adjustment slider 82 is at the maximum forward position in the axial direction, the starting point and the final point of the cam surface 65a of the cam member 65 are at the same height as shown in FIG. , And the entire cam surface 65a is determined to be on the same plane.
- the adjustable maximum amount of extension of the writing core 4 by the extension amount adjusting mechanism 80 is the distance between the maximum advancing position and the maximum retracted position of the adjustment slider 82 with respect to the adjustment tip 81.
- the adjustment slider 82 when the adjustment slider 82 is at the maximum forward position, the starting point and the final point of the cam surface 65a of the cam member 65 are at the same height, the contact 3b has the cam surface 65a. It only orbits along the same plane along. Therefore, the slider 3 does not retract in the axial direction based on the cushioning motion of the writing core by the writing operation, and therefore the extension amount of the writing core 4 is zero.
- the cam surface 65a of the cam member 65 is also retracted axially while being supported by the support 82a.
- the cam member 65 is deformed so that the free end side is retracted so as to be pushed up from below with the fixed end by the connection portion 65b as a fulcrum.
- the cam member 65 forms a cam surface 65a which rises like the cam surface 8a in the first embodiment and the second embodiment.
- the cam member 65 has a restoring force by the action of the cam contact spring 20 or the dual purpose spring 50 or the elasticity of the cam member 65 itself.
- the free end moves forward with the fixed end by the connection portion 65b as a fulcrum.
- the adjustment slider 82 continues to be moved forward and reaches the maximum forward position, as shown in FIG. 17, the entire cam surface 65a is flush with the same surface.
- a scale or the like indicating the relative position of the adjustment slider 82 may be provided on the outer peripheral surface in the vicinity of the adjustment slide hole 81 a of the adjustment port tip 81 so that the user can visually recognize the degree of the current feed amount.
- the starting point side of the cam surface 65a of the cam member 65 is set as the fixed end, and the withdrawal amount of the writing core 4 is adjusted by retracting the final point side. It was possible. However, the final point side of the cam surface 65a of the cam member 65 may be used as a fixed end, and the feed amount of the writing core 4 may be adjustable by advancing the starting point side.
- the writing core 4 is rotationally driven together with the ball chuck 9 which is rotated by the rotational driving force of the rotor 40 in the rotational drive mechanism 29. It was configured.
- the lead-out mechanism and the feed-out amount adjustment mechanism in these embodiments can be applied to a mechanical pencil in which the writing core is not rotationally driven.
- the mechanism of the mechanical pencil which does not rotationally drive the writing core will be briefly described by taking as an example the case where it is applied to the mechanical pencil in the third embodiment described above.
- the mechanism is referred to as a non-rotational drive mechanism 90.
- FIGS. 19 to 21 show a non-rotating drive mechanism 90 of a mechanical pencil in which the writing core 4 is not driven to rotate.
- FIG. 19 is a sectional view showing a mechanism in which the ball chuck 9 and the writing core 4 do not rotate despite the rotational driving action of the rotor 40
- FIG. 20 is an axis with respect to the sectional view of FIG.
- FIG. 21 is another cross-sectional view rotated 90 degrees around the direction
- FIG. 21 is a partially broken perspective view of the front portion of the non-rotational drive mechanism 90.
- the parts corresponding to the respective parts in the first embodiment shown in FIGS. 1 and 3 and the third embodiment shown in FIGS. 11 to 13 are indicated by the same reference numerals, and therefore the detailed description thereof is omitted.
- a mechanical pencil having a non-rotational drive mechanism 90 is advantageous for the user who does not like the rotation of the writing core.
- the non-rotational drive mechanism 90 is a first relay member similar to the first relay member 16, the second relay member 17 and the knocking cylinder 22 according to the first embodiment but different in shape from each other. 91, a second relay member 92, and a cylinder 93 for knocking operation.
- the first relay member 91 is provided with a sliding contact protrusion 91 a formed in an annular shape on the outer peripheral surface thereof. Further, the first relay member 91 is provided with a pair of holding holes 91b extending in the axial direction in the cylindrical portion on the rear end side of the sliding contact protrusion 91a and disposed at a position opposed to the axial center. .
- the second relay member 92 has a sliding contact groove 92a annularly provided on the inner peripheral surface thereof at a position corresponding to the sliding contact projection 91a of the first relay member 91 and in a shape complementary thereto. .
- a pair of holding projections 93 a is provided on the outer peripheral surface of the knocking cylinder 93 at a position corresponding to the pair of holding holes 91 b of the first relay member 91.
- the first relay member 16 is fitted to the inner peripheral surface of the second relay member 17 formed in a cylindrical shape at a substantially central portion in the length direction thereof. Is attached.
- the rotational movement of the relay pipe 18 connected to the rotary drive mechanism 29 rotates the writing core 4 together with the ball chuck 9 and the slider 3 via the second relay member 17 and the first relay member 16.
- the non-rotational drive mechanism 90 the first relay member 91 and the second relay member 92 are not fitted, and therefore the rotational movement of the second relay member 92 is not transmitted to the first relay member 91. . That is, since the rotational movement of the second relay member 92 is absorbed by the sliding between the sliding contact groove 92 a and the sliding contact projection 91 a of the first relay member 91, the rotation of the first relay member 91 is Exercise is suppressed.
- the rotational movement may be transmitted due to the friction between the sliding contact projection 91a and the sliding contact groove 92a, but the holding projection 93a of the knocking cylinder 93 is a pair of holding holes of the first relay member 91.
- the holding projection 93a of the knocking cylinder 93 extends into the pair of holding holes 91b of the first relay member 91, the axial sliding movement of the knocking cylinder 93 is permitted, but the axial direction is allowed. Rotational movement around is not acceptable.
- the holding projection 93 a of the knocking cylinder 93 is adjusted to such a height that it does not abut on the inner peripheral surface of the second relay member 17. Therefore, the holding projection 93a of the knocking cylinder 93 does not inhibit the knocking operation.
Landscapes
- Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)
Abstract
Description
また一度のノック操作による芯の繰り出し量が小さいと、筆記動作により芯が摩耗するために、筆記動作中においてノック操作を頻繁に繰り返す必要があり、操作が煩わしいという問題が生ずることになる。
これにより、一度のノック操作による口先部からの芯の突出量を多少大きく設定しても、筆記芯はパイプ状の芯ガイドにより保護され、筆記に伴う芯折れが発生する度合いを低くさせることができる。
そして、ノック操作する毎に口先部から先端パイプが筆記芯と共に大きく繰り出されることになるため、筆記の感触に違和感を与えるという問題が生じ得る。
この場合、前記軸筒の前端部には口先部が着脱可能に取り付けられ、前記カム部材は、前記口先部内に配置されて当該口先部と共に交換可能に構成されている。
したがって筆記動作に伴う芯の摩耗に対応して、筆記芯が除々に繰り出されるように作用し、筆記に伴う芯の摩耗にもかかわらず、先端パイプ等からの筆記芯の出寸法をほぼ一定に、もしくは一度のノック操作で長く書き続けることができる理想に近いシャープペンシルを提供することができる。
これにより、前記回転駆動機構における回転子の回転駆動力を筆記芯の繰り出し動作に変換することができ、動作が確実な精度の高い筆記芯の繰り出し動作を実現することができる。
これにより、書き進むにしたがって筆記芯が偏摩耗するのを防止させることができ、描線の太さや描線の濃さが大きく変化するという問題を解消させることができる。
前記口先部2は前方に向かって内径が段状に細くなるように構成されており、その内部にはスライダ3が軸方向にスライド可能に、また軸回転が可能となるように収容されている。なお、前記スライダ3も前方に向かって外径が段状に細くなるように構成されており、スライダ3の先端部3aは円柱状に形成されて、前記口先部2の前端部に筒状に形成された孔より突出した状態で収容されている。
なお、前記締め具10の前端部の内周面には、前記チャック本体部11が所定よりも前進するのを阻止すると共に、前記ボール12が脱落するのを阻止する環状のストッパ部材13が嵌め込まれている。
一方、前記筆記芯4を前方に引き出す力が働く場合には、チャック本体部11は前記締め具10による作用を受けないために、筆記芯4を比較的抵抗なく前方に引き出すことができる。すなわち、ボールチャック9は、前記筆記芯4の前進を許容し後退を阻止するように作用する。
そして、チャック本体部11の長さ方向の中央部を取り囲むようにしてコイル状のスプリング14が配置されており、このスプリング14の前端は前記締め具10の内周面に形成された段部に係合し、スプリング14の後端はチャック本体部11の後端側の大径部に当接した状態になされている。
そして、第2の中継部材17の後端部内周面には、可撓性の素材、例えば合成樹脂により成形された短軸状の中継パイプ18が接続されおり、この短軸状の中継パイプ18は後述する回転駆動機構に連結されている。
すなわち、このスプリング20は前記スライダ3を前方に押し出すように作用し、後述する芯繰り出し機構を構成するカム部材8のカム面にスライダ3の当接子3bを当接させるように働く。この芯繰り出し機構については後で詳細に説明するが、前記スプリング20を便宜上、カム当接用スプリングと称呼する。
そして、前記回転駆動機構29は、図2に示されているとおり、先軸1の後端部との間に介在された軸スプリング30によって後方に押し付けられ、前記後軸25内の縮径により形成された段部25aに、前記軸スプリング30の付勢力によって押し当てられている。これにより回転駆動機構29は後軸25内に固定されている。
なお、前記した前記回転駆動機構29の構成および作用については、図4~6に基づいて後で詳細に説明する。
そして、ノック棒31の中央よりも若干後端部寄りには、筆記芯の補給孔を備えた隔壁部31aが形成されている。なお、ノック棒31の後端部には、消しゴム33が着脱可能に装着されると共に、消しゴム33を覆うノックカバー34がノック棒31の後端部の周面に着脱可能に取り付けられている。
また、前記芯ケース23の後端部には、円筒部材35が取り付けられており、前記ノックカバー34をノック操作することにより前記ノック棒31の隔壁部31aが円筒部材35を前方に押し出し、これに伴って芯ケース23も前進するように動作する。
これに伴い、チャック本体部11に把持された筆記芯4も前進し、筆記芯4を先端パイプ5より繰り出させるように作用する。そして前記したノック操作の解除によりノック棒31は、リターンスプリング32の作用により後退して図2に示す状態に復帰する。
また、前記ノックカバー34をノックした状態に維持することで、チャック本体部11は締め具10から突出して芯4の把持は解除される。この状態において、先端パイプ5から繰り出された状態の筆記芯4を指先等で押し戻すことができる。
この回転駆動機構29には、回転子が具備され、前記したボールチャック9に把持された前記筆記芯4が受ける筆記圧による軸方向の後退動作および筆記圧の解除による軸方向の前進動作を受けて前記回転子を一方向に回転駆動させるように作用する。
前記回転子40は、その前端部付近が若干径を太くした太径部になされ、その太径部の一端面(後端面)には第1のカム面40aが形成されており、太径部の他端面(前端面)には第2のカム面40bが形成されている。
前記した回転駆動機構29は、その中央部が芯ケース23を通す空間部になされて芯ケース23とは隔離されており、前記した符号40~46で示す各部材により一体に結合されてユニット化されている。
図5および図6において、符号40は前記した回転子を模式的に示したものであり、その一端面(図の上側の面)には、周方向に沿って連続的に鋸歯状になされた第1のカム面40aが円環状に形成されている。また回転子40の他端面(図の下側の面)にも、同様に周方向に沿って連続的に鋸歯状になされた第2のカム面40bが円環状に形成されている。
この時、前記回転子40側の第1カム面40aと前記第1の固定カム面41aが、軸方向においてカムの一歯に対して半位相(半ピッチ)ずれた関係となるように設定されている。
この図5(C)に示す状態においては、前記回転子40側の第2カム面40bと前記第2の固定カム面42aが、軸方向においてカムの一歯に対して半位相(半ピッチ)ずれた関係となるように設定されている。
これにより、前記した中継パイプ18、第2中継部材17および第1中継部材16を介してボールチャック9に把持された筆記芯4も、前記スライダ3と共に回転駆動を受ける。
なお、図7は口先部を除いた状態のシャープペンシルの前半部を、一部を破断した状態で示した斜視図であり、図8は同じく口先部を除いた状態において、主にカム部材とスライダとの関係を示した斜視図である。
このカム部材8は、図8に示されているように円環状の端面に周方向に沿ってせり上るカム面8aを備えると共に、前記カム面8aの出発点(低位置)と最終点(高位置)との間に軸方向に段差8bを備えた構成にされている。
すなわち、前記軸方向の段差8bが前記カム面8aの出発点と最終点とを繋いだ構成にされている。
これにより、スライダ3に形成された前記当接子3bは、前記カム部材8のカム面8aに沿ってせり上るように動作し、これに伴い前記スライダ3は除々に軸方向に後退する。この時、ボールチャック9によって把持された筆記芯4は、相対的に先端パイプ5より繰り出されるように作用する。
この時、スライダ3内に収容された保持チャック6も同様に前進するので、保持チャック6に摺接して保持された筆記芯4を前記ボールチャック9より引き出すように動作する。
このように、クチプラ2内にカム部材8を収容した前者の構成、またはクチプラ2とカム部材8とを一体に成形した後者の構成を採用するにしても、カム部材8に形成される軸方向の段差8bの大きさを複数種類用意し、使用者がクチプラ2の交換と共に前記段差8bの異なるカム部材8を選択できるようにすることで、芯繰り出し機構における筆記芯の繰り出し量を調整することが可能となる。
また、スライダ3には図10に模式図で示したように、スライダ3の本体に対して軸方向に突出するロッド状の当接子3bが形成されており、このロッド状の当接子3bの先端部は、前記兼用スプリング50の作用により、口先部2内に配置されたカム部材8のカム面8aに当接されるように構成されている。
すなわち、この第2の実施の形態においては、筆記に伴う筆記芯4のクッション動作により前記回転駆動機構29が動作し、これにより前記スライダ3に形成されたロッド状の当接子3bが、段差8cおよび8dに順次落ち込むことで、当接子3bがカム面8aの最終点(高位置)から出発点(低位置)に移動するように動作する。
続いて図6(E)に示すように回転子の第2カム面40bが下カム形成部材42側の固定カム面42aに噛み合った状態で、前記スライダ3の当接子3bが前記兼用スプリング50の作用を受けて段差8dに沿って落ち込むように動作する。
したがって、図9および図10に示した第2の実施の形態においても、すでに説明した第1の実施の形態と同様の作用効果を得ることができる。
これは前記した回転駆動機構29を構成する鋸歯状カムの歯数、すなわち鋸歯状カムの回転歩進量との兼ね合いで、その組み合わせを適宜設定することができる。
2 口先部(クチプラ)
3 スライダ
3a スライダ先端部
3b 当接子
4 筆記芯
5 先端パイプ
6 保持チャック
8 カム部材
8a カム面
8b 段差
8c,8d 二段段差
9 ボールチャック
10 締め具
11 チャック本体部
12 ボール
14 チャック用スプリング
16 第1中継部材
17 第2中継部材
18 中継パイプ
20 カム当接用スプリング
22 ノック作動用円筒体
23 芯ケース
25 後軸(軸筒)
26 外軸
29 回転駆動機構
30 軸スプリング
32 リターンスプリング
34 ノックカバー
40 回転子
40a 第1カム面
40b 第2カム面
41 上カム形成部材(第1カム形成部材)
41a 第1固定カム面
42 下カム形成部材(第2カム形成部材)
42a 第2固定カム面
44 シリンダー部材
45 トルクキャンセラー
46 クッションスプリング
50 兼用スプリング
51 パイプ支持部材
Claims (12)
- 筆記芯の前進を許容し後退を阻止するボールチャックが軸筒内に収容され、前記ボールチャックに把持された前記筆記芯が受ける筆記圧による軸方向の後退動作および筆記圧の解除による軸方向の前進動作を受けて前記筆記芯を前方に繰り出す芯繰り出し機構を具備することを特徴とするシャープペンシル。
- 前記芯繰り出し機構は、前記ボールチャックに把持された前記筆記芯が受ける筆記圧による軸方向の後退動作および筆記圧の解除による軸方向の前進動作によって繰り出される前記筆記芯の繰り出し量を調整する繰り出し量調整機構を有することを特徴とする請求項1に記載されたシャープペンシル。
- 前記ボールチャックに把持された筆記芯が受ける筆記圧による軸方向の後退動作および筆記圧の解除による軸方向の前進動作を受けて、回転子を一方向に回転駆動させる回転駆動機構をさらに具備し、前記芯繰り出し機構は、前記回転駆動機構における前記回転子の回転駆動力を受けて、前記筆記芯を前方に繰り出すように構成されていることを特徴とする請求項1または2に記載されたシャープペンシル。
- 前記芯繰り出し機構は、円環状の端面に周方向に沿ってせり上るカム面を備えると共に、前記カム面の出発点と最終点との間に軸方向に段差を備えてなるカム部材と、前記回転駆動機構における回転子の回転駆動力を受けて回転し、一部に前記カム部材のカム面に当接する当接子を備え、かつ軸芯部に前記筆記芯の周面に摺接して筆記芯を保持する保持チャックを内装したスライダとを有し、
前記カム部材のカム面に当接する前記スライダの当接子が、軸方向に形成された前記段差に落ち込む際の前記スライダの前進動作により、前記保持チャックに摺接して保持された筆記芯を前記ボールチャックより引き出すように動作することを特徴とする請求項3に記載されたシャープペンシル。 - 前記繰り出し量調整機構は、前記段差の高低差を調整して前記筆記芯の繰り出し量が調整されることを特徴とする請求項4に記載されたシャープペンシル。
- 前記カム部材は、前記カム面の出発点側または最終点側のいずれか一方を固定端とし他方を自由端とする梁状部材であり、
前記繰り出し量調整機構は、円環状の端面に周方向に沿ってせり上る調整カム面を備えてなる調整カム部材と、前記カム部材と前記調整カム部材との間に配置され、かつ前記調整カム面に当接する調整当接子とを有し、
前記調整カム部材を回転させると、当該回転に応じて前記調整カム面を摺動することによって生じる前記調整当接子の前後動によって前記カム部材の自由端側を前後動させて前記段差の高低差が調整されるように構成したことを特徴とする請求項5に記載されたシャープペンシル。 - 前記カム部材は、前記カム面の出発点側または最終点側のいずれか一方を固定端とし他方を自由端とする梁状部材であり、
前記繰り出し量調整機構は、前記カム部材に取り付けられた調整スライダを有し、
前記調整スライダを前後動させることによって前記カム部材の自由端側を前後動させて前記段差の高低差が調整されるように構成したことを特徴とする請求項5に記載されたシャープペンシル。 - 前記繰り出し量調整機構は、前記カム部材の交換によって前記段差の高低差が調整されるように構成したことを特徴とする請求項5に記載されたシャープペンシル。
- 前記軸筒の前端部には口先部が着脱可能に取り付けられ、前記カム部材は、前記口先部内に配置されて当該口先部と共に交換可能に構成されていることを特徴とする請求項8に記載されたシャープペンシル。
- 前記回転駆動機構における回転子の回転駆動力を受けて回転する前記ボールチャックと共に、前記筆記芯が回転駆動されるように構成したことを特徴とする請求項3ないし請求項9のいずれか1項に記載されたシャープペンシル。
- 前記軸筒の一部に配置されたノック部のノック操作により前記ボールチャックが軸方向に前後動するように構成され、前記ボールチャックの前進による筆記芯の把持作用、および前記ボールチャックの後退による筆記芯の解除作用により、前記筆記芯を前方に繰り出すことができるように構成したことを特徴とする請求項1ないし請求項10のいずれか1項に記載されたシャープペンシル。
- 前記回転駆動機構には、回転子および第1と第2のカム形成部材とが具備され、前記回転子は円環状に形成されてその軸方向の一端面および他端面に第1と第2のカム面がそれぞれ形成されると共に、前記第1と第2のカム面にそれぞれ対峙するように前記第1と第2のカム形成部材に形成された第1と第2の固定カム面が配置され、
前記筆記圧による前記ボールチャックの後退動作によって、前記回転子における第1のカム面が、前記第1の固定カム面に当接して噛み合わされ、前記筆記圧の解除により前記回転子における第2のカム面が、前記第2の固定カム面に当接して噛み合わされるように構成され、
前記回転子側の第1カム面が、前記第1の固定カム面に噛み合わされた状態において、前記回転子側の第2カム面と前記第2の固定カム面が、軸方向においてカムの一歯に対して位相がずれた関係に設定され、前記回転子側の第2カム面が、前記第2の固定カム面に噛み合わされた状態において、前記回転子側の第1カム面と前記第1の固定カム面が、軸方向においてカムの一歯に対して位相がずれた関係に設定されていることを特徴とする請求項3ないし請求項6のいずれか1項に記載されたシャープペンシル。
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CN107594882B (zh) * | 2017-10-13 | 2023-08-08 | 广东郦江科创实业有限公司 | 双脚升降桌的升降装置及含该升降装置的升降桌 |
EP3960485A4 (en) * | 2018-12-13 | 2023-01-04 | Mitsubishi Pencil Company, Limited | PENCIL PENCIL |
US11884093B2 (en) | 2018-12-13 | 2024-01-30 | Mitsubishi Pencil Company, Limited | Mechanical pencil |
EP3960486A4 (en) * | 2019-04-26 | 2023-01-04 | Mitsubishi Pencil Company, Limited | PENCIL PENCIL |
JP2022010698A (ja) * | 2020-06-29 | 2022-01-17 | ぺんてる株式会社 | シャープペンシル |
JP7415228B2 (ja) | 2020-06-29 | 2024-01-17 | ぺんてる株式会社 | シャープペンシル |
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JPWO2012176636A1 (ja) | 2015-02-23 |
JP6275195B2 (ja) | 2018-02-07 |
CN103619609B (zh) | 2015-09-30 |
JP6053680B2 (ja) | 2016-12-27 |
JP2016153246A (ja) | 2016-08-25 |
TW201311472A (zh) | 2013-03-16 |
KR20140045428A (ko) | 2014-04-16 |
KR101991528B1 (ko) | 2019-06-20 |
TWI561403B (ja) | 2016-12-11 |
CN103619609A (zh) | 2014-03-05 |
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