TWI516383B - Mechanical pencil - Google Patents

Description

mechanical pencil

The present invention relates to a mechanical pencil that can rotate a refill (replacement core) by using a writing pressure.

When writing with a mechanical pencil, it is generally not used in a state in which the barrel is orthogonal to the writing surface (paper surface), and is often used in a state of being slightly inclined with respect to the writing surface. As described above, when writing in the state of the tilting cylinder, there is a case where the writing core has a partial wear (asymmetric wear) during the continuous writing, so that the so-called drawing line becomes thicker than at the beginning. Further, not only the thickness of the drawing line is changed, but also the contact area of the writing lead with respect to the writing surface is changed, so that the shading of the drawing line also changes during the continuous writing (the drawing line becomes thin).

When the above-mentioned problem is avoided, since the tip end of the refill is in contact with the paper surface and is written in order to continuously write the bobbin, the problem that the drawing line becomes thick during continuous writing can be avoided. However, when the cylinder is continuously rotated to perform writing, as the writing progresses, there is a problem that it is necessary to change the operation of the shaft holding method, and the writing efficiency is remarkably lowered.

At this time, when the outer casing of the shaft cylinder is formed into a cylindrical shape, it is not impossible to change the rotation of the shaft cylinder to perform the writing in sequence, but the outer casing is not cylindrical, and a projection is provided in the middle abdomen, or In the case of a side-by-side type of automatic pencil, it is also difficult to change the manner in which the method is performed by rotating the shaft in the same manner as described above.

Here, in order to eliminate the above-mentioned problems, a mechanical pencil having a rotary drive mechanism that rotates the writing reed by a chuck that constitutes a holding refill, and that rotates the refill together with the collet is provided, for example, Japanese Patent No. 3882272, Japanese Patent No. 3885315, and the like are disclosed.

However, according to the mechanical pencil disclosed in the above-mentioned prior art document, in the barrel, the vertical projections and the vertical grooves are alternately arranged, and the cam portion that spans the inclined surfaces is formed in a ring shape. Further, a rotor in which a discontinuous projection is formed in the circumferential direction is accommodated in the barrel.

Then, by retracting the refill substantially, the rotor is pushed up, and the projection of the rotor rests on the longitudinal projection of the cam portion formed in the barrel, and falls into the longitudinal groove of the partition via the inclined surface. The rotation of the rotor is achieved, and the rotational motion of the rotor is transmitted to the core case, and the refill is rotationally driven. This is a well-known Kern knock mechanism that is often used in a push-type ball pen or the like.

According to the above-described mechanical pencil, when the rotor is rotated, it is necessary to have a large reverse stroke in which the projection on the rotor side crosses the refill required for the vertical projection formed in the barrel. Therefore, when the core is asymmetrically worn due to writing, it is necessary to apply a pressure equal to or higher than the normal writing pressure to the refill to allow the rotor to retreat in the bobbin, so that the rotor-side projection is formed in the barrel. The writing of the aforementioned longitudinal projections is a different operation. Since this operation must be performed relatively frequently during each asymmetric wear process of the refill, there is a problem that the efficiency of writing is lowered.

In order to solve the problem of the automatic pencil disclosed in the above-mentioned prior art document, the applicant of the present application applied a slight use of the refill in the writing process in Japanese Patent Application No. 2007-339074 and Japanese Patent Application No. 2007-339075. The back and forward movements (this is also referred to below as the cushioning action.), which causes the refill to rotate and drive the automatic pencil.

In the mechanical pencil of the above-mentioned application, the first and second cam faces are formed on the respective end faces of the cylindrical rotor, and the first cam surface and the first fixed cam are caused by the retracting operation of the rotor by the writing pressure. The surface abuts and bites. Further, the forward movement of the rotor is caused by the release of the writing pressure, and the second cam surface and the second fixed cam surface are brought into contact with each other and engaged.

Then, by the reciprocal engagement of the aforementioned cams, the rotor is sequentially rotated in one direction. The rotation operation is transmitted to the refill via the chuck holding the refill.

According to the above configuration, the amount of backlash (buffering operation amount) of the core during writing is set to about 0.05 to 0.5 mm, so that the refill can be rotationally driven in order, thereby providing usability that the writing efficiency is not lowered. Excellent automatic pencil.

On the other hand, in the above-described mechanical pencil, since the core is accompanied by the above-described buffering operation, the refilling operation of the refill always has a "not solid" touch and a refill caused by the buffer spring. The "kaka" touch will also occur in the return action.

In order to alleviate the occurrence of discomfort caused by such a unique tactile sensation, the applicant of the present application has proposed a movable member in which an adhesive medium (adhesive grease) is interposed in the axial direction together with the refill; And a mechanical pencil that imparts a damping function to the cushioning action of the refill between the fixing member facing the movement of the movable member. This application is disclosed in the aforementioned Japanese Patent Application No. 2007-339075 (International Publication No. WO 2009/84446).

However, even in such a mechanical pencil having a revolving drive mechanism having a refill, it is necessary to diversify the needs of the customer. For example, it is conceivable to arrange a large thick wall on the front end side of the bobbin. The configuration of the grip portion formed by the coated rubber; or the configuration of the side pressing member for continuous release of the refill on the side wall of the barrel. In this case, it is necessary to arrange the above-described rotation drive mechanism on the rear half side of the barrel, and to connect the rotation drive mechanism and the grip head holding the refill to each other with a relatively long rotary relay pipe.

As described above, in particular, in the configuration in which the rotary drive mechanism is disposed in the vicinity of the rear portion of the barrel, since it is necessary to have a long-sized rotary relay tube, it is greatly affected by the molding of the components constituting the rotary drive mechanism or The assembly error and the influence of the eccentricity or the like caused by the mutual connection of the rotary driving portions of the refill including the relay pipe or the collet make it difficult to ensure the normal rotational driving operation of the refill.

The present invention provides a developer who has focused on the above-mentioned unique problem of a mechanical pencil having a rotary drive mechanism having a refill, and it is possible to overcome various factors as described above even if a long-sized rotary relay tube is used, for example. A mechanical pencil that can prevent the normal rotation of the refill from occurring as a first problem.

On the other hand, the adhesive grease which generates a damping function in the cushioning action of the refill is applied to the circumferential surface of the moment eliminator as the movable member described above, and the torque eliminator in this state is a circle along the fixed member. The inner peripheral surface of the cylindrical stopper member is attached to each other.

Therefore, according to the application and filling operation of the above-mentioned adhesive grease, even if the circumferential surface of the torque canceler is often adhered with approximately the same amount of adhesive grease, the torque canceller is mounted along the inner circumferential surface of the stopper member. There is also a problem in that the amount of lubricating oil that is filled between the two is changed by a slight difference in the assembly method of the two.

That is, the amount of the adhesive grease filled in the gap between the aforementioned torque canceller and the stopper member cannot be stabilized, and it is not ensured that the entire gap is filled with the adhesive grease. Therefore, there is a problem that the damping function is likely to be uneven and the functional stability is poor.

The present invention has been developed in view of the problem of the aforementioned damping function of a mechanical pencil having a revolving drive mechanism having a refill, and in particular, provides a filling operation that does not require proficiency and easy adhesion of an adhesive grease, and is stable and reliable. It is a second problem to perform a mechanical pencil that does not cause unevenness in the damping function by performing the filling amount of the adhesive grease filled in the gap between the two.

In order to solve the above-mentioned first problem, the mechanical pencil of the present invention developed by the present invention is configured to release and release the pen from the front side by the forward and backward movement of the chuck according to the pressing operation of the pressing member. a core, and a mechanical pencil that can be accommodated in the shaft cylinder so as to be movable forward and backward and in a state in which the core can be rotated in the state in which the chuck is held by the chuck, and is characterized in that it can reciprocate in the axial direction. a rotation driving mechanism that converts the motion into a rotary motion is housed in the shaft cylinder, and the rotation driving mechanism and the chuck are connected via a relay member formed by a flexible material, and the relay member is used to apply the The forward and backward movement caused by the writing pressure of the refill held by the chuck causes the reciprocating motion to convey the rotation driving mechanism, and the rotation motion generated by the rotation driving mechanism is transmitted to the chuck.

At this time, it is preferable that the relay member is disposed coaxially outside the core case that is connected to the rear end portion of the chuck.

Further, in a preferred aspect of the rotary drive mechanism, the rotary drive mechanism includes a rotor to which the relay member is connected, and the rotor is formed in an annular shape and formed on one end surface and the other end surface in the axial direction. There are first and second cam faces, and first and second fixed cam faces respectively facing the first and second cams, and the retracting operation of the chuck by the writing pressure is provided. The first cam surface of the annular rotor abuts against the first fixed cam surface, and the second cam surface of the rotor is abutted against the second fixed cam surface by the release of the writing pressure, and is engaged. In a state in which the first cam surface on the rotor side is engaged with the first fixed cam surface, the second cam surface on the rotor side and the second fixed cam surface are set to be offset from one tooth position of the cam in the axial direction. In a state in which 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 one tooth in the axial direction with respect to the cam. Rendering Deviation relationship.

In the above-described rotation drive mechanism, it is preferable that the second cam surface of the rotor abuts against the second fixed cam surface in a state in which the writing pressure is released, and the buffer spring is in a state in which the second fixed cam surface is engaged.

Further, in addition to the above configuration, a torque canceller that is interposed between the rear end portion of the rotor of the rotation drive mechanism and the buffer spring is formed between the rear end portion and the rear end portion of the rotor to prevent the aforementioned It is desirable that the rotational motion of the rotor is transmitted to the aforementioned buffer spring.

On the other hand, in order to solve the above-described second problem, the mechanical pencil of the present invention is configured such that the refill can be released and held by the forward and backward movement of the collet according to the pressing operation of the pressing member, and the configuration can be continuous toward the front. The cartridge is released, and the cartridge is held in the shaft cylinder so as to be rotatable forward and backward in a state in which the cartridge is held by the chuck, and has a writing pressure according to the cartridge a mechanical pencil that causes the front and rear movement of the collet to be held by the rotary drive mechanism that is driven by the reel of the collet, and is characterized in that: the forward and backward movement of the collet according to the writing pressure of the refill, the axial direction An adhesive medium is interposed between the movable member that moves and the fixed member that faces the movement of the movable member, and the adhesive medium is configured to have a damping function by the adhesive medium in the retracting and advancing movement of the refill, and the fixing is performed. The side wall of the member is formed in the state in which the movable member is located at the first relative position with respect to the fixing member, and is formed in the fixing member and A space portion communicating with the injection hole is formed between the movable members, and the movable member is formed in a second relative position with respect to the fixing member, and the movable member blocks the injection hole and the space portion. The space portion is slightly sealed, and the movable member is placed in a state of the third relative position with respect to the fixing member, and the volume of the space portion that is slightly sealed is formed.

At this time, it is preferable to form an injection hole into which the above-mentioned adhesive medium can be injected. Moreover, it is preferable that the fixing member is constituted by a cylindrical member that slidably supports the movable member while the movable member is disposed inside, and the movable member is formed with a groove portion continuous along the outer peripheral surface, with respect to the aforementioned The fixing member, in a state in which the movable member is positioned at the third relative position, constitutes an adhesive medium stored in the space portion, and is dipped in a gap between the movable member and the fixing member via the groove portion.

In addition, in the state in which the movable member is positioned at the third relative position with respect to the fixing member, the groove formed in the movable member and the second member formed between the fixed member and the movable member are formed. The configuration in which the space portions are connected is ideal.

In this case, in a preferred embodiment, the torque canceller is used as the movable member that moves in the axial direction together with the collet, and the torque canceller can be configured to have a part of the damping function.

According to the above-described mechanical pencil of the present invention, there is provided a rotary drive mechanism that receives the writing pressure and rotationally drives the rotor, and the rotational motion of the rotor is transmitted to the refill via the chuck. Therefore, during the writing operation, since the refill is slowly driven by rotation, it is possible to prevent the eccentricity of the refill during the continuous writing process, and it is possible to eliminate the thickness of the so-called drawing line or the shading of the drawing line. The problem of change.

In addition, according to the automatic pencil that solves the first problem described above, the rotary tube that functions as a relay mechanism formed of flexible material is connected to the chuck that holds the refill and the grip that holds the refill. Since the configuration is such that even when a long-sized relay pipe is used, the flexibility of the relay pipe can be utilized to ensure the normal rotational driving operation of the refill.

That is, by using the relay tube formed of the flexible material, it is possible to effectively absorb the error in the formation of the components constituting the rotary drive mechanism or the error of its assembly by the deflection of the relay tube, and to include The eccentricity or the like generated by the mutual connection of the rotary driving portions of the refills such as the relay tube or the collet.

Further, in the mechanical pencil according to the second aspect, the damping function of the adhesive medium is applied to the front and rear movement of the chuck caused by the writing pressure, and the damping function is in accordance with the movable member with respect to the fixed member. The 1st to 3rd relative positions form a series of operations that can perform an injection of an adhesive medium to the injection hole to uniformly fill the gap between the adhesive media.

Therefore, it is possible to provide a mechanical pencil that can be easily filled with an adhesive medium without being skilled, and that can stably and reliably fill the adhesive medium between the two, and that does not cause unevenness in the damping function.

The automatic pencil of the present invention will be described based on the embodiment shown in the drawings. 1 and 2 are the overall configuration of the cross-sectional view, Fig. 1 shows the front half of the mechanical pencil, and Fig. 2 shows the rear half. In the drawings, the same reference numerals are used to denote the same parts, and in the whole figures shown in FIGS. 1 and 2, the symbols are indicated in the representative parts.

The tip (pen tip) indicated by reference numeral 1 is screwed to the front end portion of the front shaft 2 constituting the barrel formed of the metal material, and is detachably attached. Further, a cylindrical core case 3 is accommodated coaxially along the center portion of the front shaft 2 and a rear shaft to be described later. A core shaft joint 4 having a short shaft as shown in FIG. 3 is attached to the front end portion of the core box 3, and a brass chuck 5 is coupled to the core box joint 4.

In the chuck 5, a through hole of a refill (not shown) is formed along the axial center thereof, and the tip end portion is divided into a plurality of portions, and the divided distal end portion is slidably fitted in a circular ring formed of brass. Inside the buckle 6. The ring-shaped clips 6 are attached to the inner surface of the pipe joint 7 that is disposed to cover the periphery of the chuck 5.

A cylindrical slider 8 accommodated in the above-described tip 1 and having a tip end portion protruding from the tip end is attached to the tip end portion of the pipe joint 7, and a tip end for guiding the lead is attached to the tip end portion of the slider 8. Tube 9. Further, on the inner surface of the slider 8, a rubber holding chuck 10 in which a through hole is formed in a shaft core portion as shown in Fig. 3 is housed.

According to the above configuration, the through hole formed in the chuck 5 is formed by the through hole formed in the axial center of the holding chuck 10, and the linear core insertion hole reaching the distal end tube 9 is formed. A refill having a non-pattern is inserted into the linear core insertion hole. Further, a spiral collet spring 11 is disposed between the pipe joint 7 and the core box joint 4 described above.

Further, the rear end portion of the collet spring 11 abuts against the front end surface of the core box joint 4, and the front end portion of the collet spring 11 abuts against the annular member formed on the inner circumferential surface of the pipe joint 7. It is contained in the state. Therefore, by the action of the chuck spring 11, the chuck 5 is pushed in the backward direction, that is, in the direction in which the pen core is gripped.

In the continuous output unit of the cartridge according to the above configuration, the core case 4 is advanced in the barrel by pressing a pressing member (pressing rod) described later. At this time, the large-diameter portion formed on the slider 8 abuts against the inner surface of the pen tip 1, and in order to prevent the advancement thereof, the tip end portion of the chuck 5 protrudes from the clip 6 and the refill of the chuck 5 is released. The state of control. Then, by the release of the pressing operation, the core case 3 and the collet 5 are retracted in the barrel by the action of the chuck spring 11.

At this time, the refill is held in the through hole of the holding collet 10, and is held by friction. In this state, the collet 5 is retracted, and the front end portion thereof is housed in the clip device 6 to form a grip. The status of the refill. In other words, the collet 5 is moved back and forth by the pressing operation of the pressing bar, which will be described later, whereby the refill is released and held, and the refill is continuously released from the collet 5 in the forward direction.

As shown in FIGS. 1 and 4, in the front shaft 2 constituting the barrel, the grip member 13 is attached so as to surround the front shaft 2. The grip member 13 is attached between the metal joint 14 fitted to the rear end portion of the front shaft 2 and the aforementioned tip 1 as shown in detail in FIG. Further, the grip member 13 is composed of an inner layer 13b formed of a rubber material and a coating layer 13a formed of the same rubber material, and is formed to be filled with a gel-like substance as needed.

Further, the shaft shutter 15 made of synthetic resin is fitted so as to shield the flange portion 14a formed at the front end portion of the shaft joint 14, and the rear end portion of the grip member 13 is shielded by the shaft shield 15. Is installed.

A spiral thread is formed on the outer circumferential surface of the shaft joint 14, and the thread is used to lock the rear shaft 17 constituting the shaft cylinder as shown in Fig. 2 to be attached. Further, an outer shaft 18 integrally formed with a pen holder portion 18a which is a stopper ring 19 which is screwed to the rear end portion of the rear axle 17 is attached so as to shield the outer side of the rear shaft 17 The shaft shield 15 is inserted between the shaft shields 15 in the axial direction.

In the embodiment of the embodiment, as described above, in the relationship in which the relatively thick-walled grip member 13 is attached to the front shaft 2 side, the reel drive mechanism 21 of the refill is disposed on the grip member 13 as shown in FIG. The mounting position is further located between the aforementioned rear axle 17 and the core box 3 at the rear. Although the configuration of the rotary drive mechanism 21 will be described in detail later, it is housed in the above-described barrel formed of one unit independent of the mechanical pencil body.

Further, as shown in FIG. 3, the above-described rotation drive mechanism 21 that can be used as a pan-product is connected to a pipe member that can be formed as a relay member by a flexible material (hereinafter also referred to as a pipe member). The rear end portion of the relay pipe 22 is connected to the pipe joint 7 of the support chuck 5 at the rear end portion of the relay pipe.

In other words, the relay tube 22 is disposed coaxially so as to shield the core case 3, and the relay tube 22 transmits the retracting and advancing operation (buffering operation) of the refill to the rotation driving mechanism 21 in accordance with the writing operation. Further, the rotary motion caused by the rotation driving mechanism 21 generated by the buffering operation is transmitted to the pipe joint 7 and the chuck 5 via the relay pipe 22.

Further, as shown in FIG. 2, the rotation drive mechanism 21 is spring-loaded toward the rear by a shaft spring 24 interposed between the front end portion and the shaft joint 14. Further, the rear end portion of the rotation driving mechanism 21 is a segment portion 17a formed by the elastic force of the shaft spring 24 and the reduced diameter in the rear shaft 17.

That is, in the embodiment of the embodiment, the unitized rotation drive mechanism 21 is restricted from rotating by the friction generated by the contact with the segment portion 17a in the rear axle 17, and acts by the aforementioned buffering operation. The resulting rotational motion of the rotary drive mechanism 21 is transmitted to the chuck 5 side. Further, the mounting in the barrel of the rotary drive mechanism 21 is not limited to the above configuration. For example, the rotary drive mechanism 21 may be attached to a part of the barrel by an inserting means.

FIG. 5 shows a configuration in which the above-described rotation drive mechanism 21 is enlarged. The rotation drive mechanism 21 includes a rotor 26 that is formed in a cylindrical shape, and the relay pipe 22 is coupled to the inner circumferential surface of the rotor 26 at the front end portion of the rotation drive mechanism 21.

The rotor 26 is a large-diameter portion having a slightly larger diameter near the tip end portion, and a first cam surface 26a is formed on one end surface (rear end surface) of the large-diameter portion, and the other end surface (front end surface of the large-diameter portion) is formed. The second cam surface 26b is formed, and the cylindrical upper cam forming member 27 that covers the rear end side of the rotor 26 is rotatably disposed between the rotors 26, and is formed on the upper cam. A cylindrical lower cam forming member 28 is fitted and fitted to the outer periphery of the front end portion of the member 27.

Then, a fixed cam surface (also referred to as a first fixed cam surface) 27a is formed on the front end surface of the upper cam forming member 27 opposed to the first cam surface 26 of the rotor 26. Further, a fixed cam surface (also referred to as a second fixed cam surface) 28a is formed on the inner surface of the front end portion of the lower cam forming member 28 opposed to the second cam surface 26b of the rotor 26.

Further, the relationship between the first and second cam faces 26a and 26b formed on the rotor 26, the first fixed cam surface 27a, and the second fixed cam surface 28a, and the mutual action are based on FIGS. 6 and 7 Explain in detail.

As shown in Fig. 5, a cylindrical member 30 is fitted to the rear end side of the upper cam forming member 27, and an insertion hole 30a through which the core case 3 can be inserted is formed at the rear end portion of the cylindrical member 30. Further, a torque canceller 31 which is formed in a cylindrical shape and movable in the axial direction is disposed in the cylindrical member 30, and the front end of the inner peripheral surface of the torque canceller 31 and the inside of the cylindrical member 30 are disposed. A spiral buffer spring 32 is mounted between the rear ends of the circumferential faces.

The buffer spring 32 acts to push the torque canceller 31 forward, and the rotor 26 is pressed by the torque canceller 31 that receives the spring force to move forward.

As described above, in the rotary drive mechanism 21 of the embodiment, the central portion thereof is a space portion through which the core case 3 passes, and is separated from the core case 3, and the members indicated by the above-described symbols 26 to 32 are integrally coupled and configured to be unitized.

According to the configuration of the above-described rotation drive mechanism 21, in a state in which the cartridge 5 grips the refill, the rotor 26 is formed to be rotatable about the axis center together with the cartridge 5 via the relay tube 22. Then, when the mechanical pencil is outside the writing state, the rotor 26 is pushed forward by the torque canceller 31 by the action of the buffer spring 32.

On the other hand, when a mechanical pencil is used, that is, when the writing pressure is applied to the refill protruding from the distal end tube 9, the collet 5 reversing against the spring force of the buffer spring 32, and the retracting rotor 26 is also in the shaft. Go back. Therefore, the first cam surface 26a formed in the rotor 26 shown in FIG. 5 is joined to the first fixed cam surface 27a to be in a state of being engaged.

6(A) to 6(C) and Figs. 7(D) and (E) are the basic actor of the rotation drive mechanism 21 for rotationally driving the rotor 26 in accordance with the above-described operation. In Fig. 6 and Fig. 7, reference numeral 26 denotes the above-described rotor in a pattern. On one end surface (the upper surface of the figure), the first cam surface 26a which is continuously formed in a zigzag shape is formed in an annular shape along the circumferential surface. Further, on the other end surface (the lower surface in the drawing) of the rotor 26, the second cam surface 26b which is continuously formed in a zigzag shape is similarly formed in an annular shape along the circumferential surface.

On the other hand, as shown in FIG. 6 and FIG. 7, the annular fixed end surface of the upper cam forming member 27 is also formed with a first fixed cam surface 27a continuously formed in a zigzag shape along the circumferential direction, and the lower cam forming member 28 is formed in the lower cam forming member 28. The annular end surface is also formed with a second fixed cam surface 28a that is continuously formed in a zigzag shape along the circumferential direction.

Further, the first cam surface 26a and the second surface of the rotor 26 are formed. The cam surface 26b, the first fixed cam surface 27a formed on the upper cam forming member 27, and the zigzag cam surfaces are formed along the circumferential direction of the second fixed cam surface 28a formed in the lower cam forming member 28, and the pitch is They are formed in substantially the same way as each other. Further, the ○ mark drawn in the central portion of the rotor 26 of FIGS. 6 and 7 indicates the rotational movement state of the rotor 26.

Fig. 6(A) shows the relationship between the upper cam forming member 27, the rotor 26, and the lower cam forming member 28 in a state in which the mechanical pencil is not used (in a state other than the writing state). In this state, the second cam surface 26b forming the rotor 26 abuts against the second fixed cam surface 28a side of the lower cam forming member 28 by the elastic thrust of the buffer spring 32 shown in FIG. 5. At this time, the first cam surface 26a on the rotor 26 side and the first fixed cam surface 27a are set to be offset from the one-half phase (half-pitch) with respect to one tooth of the cam in the axial direction.

Fig. 6(B) shows an initial state in which the writing pressure is applied to the writing core by the use of the automatic pencil. At this time, the rotor 26 is retracted in the axial direction via the chuck 5 and the relay pipe 22, and the buffer spring 32 is contracted. Thereby, the rotor 26 moves on the side of the upper cam forming member 27.

Fig. 6(C) shows a state in which the writing pressure is applied to the writing lead by the use of the automatic pencil, and the rotor 26 abuts against the upper cam forming member 27 side. At this time, the first cam surface 26a and the upper cam of the rotor 26 are formed. The first fixed cam surface 27a on the side of the forming member 27 is engaged. Thereby, the rotor 26 is rotationally driven by a half phase (half pitch) corresponding to one tooth of the first cam surface 26a. Then, in the state shown in Fig. 6(C), the second cam surface 26b on the rotor 26 side and the second fixed cam surface 28a are set to have a half phase (half pitch) with respect to one tooth of the cam in the axial direction. ) the relationship of deviation.

Next, Fig. 7(D) shows the state in which the writing by the mechanical pencil is completed, and the initial state of the writing pressure is released from the writing lead. At this time, the rotor 26 advances in the axial direction by the action of the above-described cushion spring 32. Thereby, the rotor 26 moves toward the lower cam forming member 28 side.

Further, Fig. 7(E) shows a state in which the rotor 26 abuts against the lower cam forming member 28 side by the action of the above-described buffer spring 32, and at this time, the second cam surface 26b and the lower cam formed on the rotor 26 are formed. The second fixed cam surface 28a on the side of the forming member 28 is engaged. Thereby, the rotor 26 is again subjected to rotational driving corresponding to the half phase (half pitch) of one tooth of the second cam surface 26b.

Therefore, as shown by the ○ mark printed on the central portion of the rotor 26, the rotor 26 receives a tooth corresponding to the first and second cam faces 26a, 26b in the axial direction of the rotor 26 subjected to the writing pressure. The rotation drive of (1 pitch) is also rotationally driven by the above-described relay pipe 22, pipe joint 7, and chuck 5 in the same manner.

According to the above-described mechanical pencil, the rotor 26 is reciprocated in the axial direction in accordance with writing, and the rotor is rotationally moved by one tooth of the corresponding cam in each of its operations, and is sequentially rotationally driven in one direction by the repetition. Therefore, the refills are also rotationally driven in the same order. Therefore, it is possible to prevent the occurrence of the eccentricity of the refill in the process of continuous writing, and it is possible to eliminate the problem that the thickness of the drawing line or the shading of the drawing line largely changes.

Further, according to the above-described mechanical pencil, since the distal end tube 9 and the slider 8 for guiding the refill are integrally operated with the rotor 26 via the tube joint 7 and the relay tube 22, they follow the writing action. In the reverse movement and the forward movement of the chuck 5 described above, the front end tube 9 and the slider 8 move in the same direction via the relay pipe 22.

Therefore, as the writing action progresses, even if the refill is only slightly moved forward (buffering action), since the leading end tube 9 guiding the refill moves in the same direction, the axial relative between the front end tube 9 and the refill The movement does not occur, and the size of the refill coming out of the front end tube 9 can be kept constant.

Further, since the distal end tube 9 and the slider 8 are coupled to the rotor 26 via the relay tube 22, when the refill is subjected to the rotational movement, the distal end tube 9 and the slider 8 are also subjected to the rotational motion, and the distal end tube 9 and the refill Turn it into one.

Therefore, according to the above-described mechanical pencil, it is possible to eliminate the problem of the strange feeling caused by the change of the refill from the front end tube 9 in the writing. Further, it is possible to prevent the change in the size of the refill coming out of the front end tube 9 from causing the core of the front end tube to be broken and the core to be broken, and it is also possible to eliminate the problem that the writing surface is contaminated by the chip of the core.

Further, the cylindrical torque canceller 31 that pushes the rotor 26 forward by the elastic thrust of the spiral buffer spring 32 is slid between the front end surface of the torque canceller 31 and the rear end surface of the rotor 26. Occurs to prevent the rotation of the rotor 26 caused by the repeated writing action from being transmitted to the buffer spring 32.

In other words, by interposing the torque canceller 31 between the rotor 26 and the buffer spring 32, the action of preventing the rotational movement of the rotor 26 is transmitted to the spring 32 by the aforementioned sliding action, and the so-called spring 32 can be eliminated. The occurrence of the torsional return (spring torque) causes a problem that the rotation of the rotor 26 is hindered.

However, according to the above-described rotation driving mechanism 21, the aforementioned buffering operation against the spring force of the buffer spring 32 shown in FIG. 5 may cause a problem of "not solid" or "kaka" during writing. The so-called problem of poor writing. In order to eliminate such a problem, the adhesive medium is preferably an adhesive grease interposed between the circumferential side surface of the torque canceller 31 and the inner circumferential surface of the cylindrical member 30, and moves in the axial direction in the cylindrical member 30. The torque canceller 31 is ideal for generating a cushioning effect.

Therefore, as shown in FIG. 5, the injection hole 30b of the adhesive oil and fat is formed in the 180-degree opposing position of the side wall of the cylindrical member 30, respectively. Further, on the side of the torque canceller 31, when the adhesive grease is injected through the injection hole 30b, the lubricating oil is sealed, and the lubricating oil is infiltrated into the entire convex member 31a and the groove of the circumferential side surface of the torque canceller 31. 31b.

A more detailed configuration and operation of the above-described tubular member 30 and torque canceller 31 will be described with reference to Figs. 8 to 10 . Fig. 8(A) is a cross-sectional view showing the appearance of the torque canceller 31, and Fig. 8(B) and Fig. 8(C) showing the state in which the torque canceller 31 is cut at positions orthogonal to each other in the circumferential direction.

A convex member 31a is formed at a substantially central position of the circumferential side surface of the torque canceller 31 at 180 degrees. Further, after the axial direction adjacent to the convex member 31a of the torque canceller 31 is positive, a continuous groove portion 31b is formed along the circumferential direction. Further, a peripheral side surface orthogonal to the convex member 31a of the torque canceller 31 is formed with a scraped portion 31c which is processed in a planar direction in the axial direction.

FIG. 9 is a view for explaining the procedure in which the torque canceller 31 having the above-described configuration is inserted into the tubular member 30, and the adhesive grease is injected into the injection hole 30b of the tubular member 30. In other words, on the inner circumferential surface of the cylindrical member 30, the concave portions 30c of the pair of convex members 31a in which the torque canceller 31 is accommodated are formed to communicate with the injection holes 30b in the axial direction.

FIG. 9(A) shows the positional relationship between the two when the adhesive grease is injected through the injection hole 30b of the tubular member 30. Further, Fig. 10(A) is a cross-sectional view seen from the line a-a of Fig. 9(A) in the direction of the arrow printing. That is, in this state, the convex member 31a of the torque canceller 31 is located further forward than the injection hole 30b formed in the cylindrical member 30. In this state, the injection hole 30b is inserted into the tip end portion of the nozzle (not shown), and the adhesive grease is injected. Accordingly, the lubricating oil is stored in the concave portion 30c of the tubular member 30.

Fig. 9(B) shows a state in which the torque canceller 31 is slightly pushed into the cylindrical member 30 after the injection of the adhesive grease, and Fig. 10(B) shows the direction of the arrow from the bb line of Fig. 9(B). The profile view seen. In this state, since the convex member 31a of the torque canceller 31 moves further rearward than the injection hole 30b of the cylindrical member 30, the concave portion 30c formed in the injection hole 30b of the cylindrical member 30 and the cylindrical member 30 is formed. The convex member 31a of the torque canceller 31 is blocked, and the concave portion 30c is sealed. Thereby, the inside of the concave portion 30c serves as a lubricating oil reservoir for the adhesive grease.

Next, Fig. 9(C) shows a state in which the torque canceller 31 is pushed into the cylindrical member 30, and Fig. 10(C) shows a cross-sectional view seen from the cc line of Fig. 9(C) in the direction of the arrow printing. . In this state, the adhesive grease enclosed in the concave portion 30c of the lubricating oil reservoir is reduced in volume by the pressure of the pushing of the torque canceller 31, and enters the groove portion 31b formed in the torque canceller 31. .

Then, the adhesive grease is immersed in the peripheral side surface of the torque canceller 31 via the groove portion 31b, that is, immersed in a slight gap between the torque canceller 31 and the cylindrical member 30, and completely penetrates therebetween.

At this time, the remaining adhesive grease which is sealed in the lubricating oil reservoir formed by the concave portion 30c enters the aforementioned side surface formed on the circumferential side surface of the torque canceller 31 via the groove portion 31b as shown in FIG. The gap between the scraped portion 31c and the cylindrical member 30 (indicated by the same reference numeral 31c as the scraped portion) is accumulated therein.

In addition, as the adhesive oil and fat, it is preferable to use a concentration of 100 to 400. For the adhesive grease, for example, Shin-Etsu Chemical Co., Ltd. product name "Shin-eup Rouge" product number: G330-334, G340 can be used as appropriate. ~342, G351～353, G631～633, etc.

Thereby, a large viscous impedance can be imparted to the rapid axial movement of the torque canceller 31, and a very small damping function can be given to the static load of the relatively slow operation.

Therefore, according to the above configuration, when the torque canceller is moved forward by the release of the writing pressure, the buffering function can be effectively applied, and the touch of the poor writing accompanying the aforementioned buffering operation can be effectively corrected. . In addition, according to the above configuration, the injection and application operation of the adhesive grease which realizes the damping function can be easily performed, and the amount of the adhesive grease applied to the portion which realizes the damping function can be uniform, so that the cushioning property can be extremely reduced. Uneven situation.

Further, in the above-described embodiment, the pair of injection holes 30b and the concave portion 30c are formed in the tubular member 30, and the pair of convex members 31a are formed in the torque canceller 31. The pair is formed for the convenience of the injection of the adhesive grease and the work of the coating operation, and each of these is formed to realize the function.

Referring back to Fig. 2, in the rear end portion of the inner shaft 17, the pressing rod 35 as a pressing member is slidably attached to the rear shaft 17, and a pressing rod is disposed in a space between the rear shaft 17 and the pressing rod 35. Return spring 36. Further, an abutting portion 35a including a refilling hole of the refill is formed at a rear end portion of the pressing rod 35. Further, at the rear end portion of the pressing rod 35, the eraser 37 is detachably mounted, and the pressing cover 38 covering the eraser 37 is detachably attached to the circumferential surface of the rear end portion of the pressing rod 35.

The abutting portion 35a of the above-described pressing rod 35 and the rear end portion of the above-described core case 3 are configured to form a confrontation at a predetermined interval. That is, the core case 3 is not mechanically coupled to the pressing bar 35, but is separated by the aforementioned interval.

In this configuration, when the pressing operation of the pressing rod 35 is performed, the abutting portion 35a of the pressing rod 35 comes into contact with the rear end portion of the core case 3, and thus the core case 3 is pushed forward. Thereby, as described above, the advancement of the chuck 5 is continuously released from the front end tube 9 by the front end tube 9. Then, by the release of the pressing operation described above, the pressing rod 35 is retracted by the action of the return spring 36 to return to the state shown in FIG. 2.

According to the above configuration, since the abutting portion 35a formed on the pressing rod 35 and the rear end portion of the core case 3 are opposed to each other at a predetermined interval, the chuck 5 and the core case 3 are made even if the writing operation is performed by the buffering operation. When the rearward portion is slightly retracted, the rear end portion of the core case 3 does not collide with the abutting portion 35a of the pressing rod 35, and the rotation of the rotation driving mechanism 21 can be prevented from being impaired.

FIGS. 11 and 12 show an example of a state in which the rotor 26 of the above-described rotary drive mechanism 21 is rotationally moved during the writing operation. That is, FIGS. 11(A) and (B) are perspective views of the configuration of the rotor 26 described above which changes the angle.

The rotor 26 is preferably formed of a white resin material, and the large diameter portion of the first cam surface 26a and the second cam surface 26b forming the rotor 26 is formed at a position facing the circumferential side surface thereof, for example, by A display portion 26c formed of black. That is, the display portion 26c formed of white and black is formed at intervals of 90 degrees along the circumferential direction of the large diameter portion.

On the other hand, Figs. 12(A) and (B) show the appearance of the mechanical pencil, and the display portion 26c formed by the white black applied to the rotor 26 described above can be seen from the outside. In this example, the display unit 26c formed of white black is displayed via the window portion 20 having a circular shape, and (A) shows the white and black display of the display portion 26c in the window portion 20 as the rotor 26 rotates. The look of the border. (B) is a view showing that the black portion of the display portion 26c is displayed in the window portion 20 as the rotor 26 is further rotated.

The above-described configuration is formed of a light transmissive resin: a lower cam forming member 28 that covers the outer side of the rotor 26 and a rotation driving mechanism 21 shown in FIG. 5, and is positioned outside the rotation driving mechanism 21 as shown in FIG. The rear shaft 17 and the outer shaft 18 that covers the outer side of the rear shaft 17 can be realized, for example, by applying the above-described circular window portion 20 to the circumferential side surface of the rear shaft 17.

In this manner, the configuration in which the rotation state of the rotor 26 can be seen from the outside is checked, and the operation check of the manufacture and assembly of the automatic pencil is performed, and the determination of the quality of the rotation drive mechanism can be easily performed by visual observation. It also helps the user to have a taste or a pleasure when using it, and can also contribute to the large differentiation of the product.

However, in the above-described rotation drive mechanism 21, as described above, the rotor 26 is reciprocated in the axial direction (buffering operation) by the writing pressure, so that the first and second cam faces 26a, 26b formed on the rotor 26 are formed. The first and second fixed cam faces 27a and 28a are engaged with each other, and the pen core is rotationally driven.

Therefore, in the rotation drive mechanism 21 formed as described above, the first rotor side is in the middle of the forward movement of the rotor 26 due to the release of the writing pressure in the middle of the retracting operation of the rotor 26 by the writing pressure. The second cam faces 26a and 26b are separated from the first and second fixed cam faces 27a and 28a, respectively, and the rotor 26 is instantaneously opened in the rotational direction.

At this moment, a slight external force, vibration, or the like is received, and the rotor 26 may be caught in a rotation failure. That is, in the trial and verification results of the inventors, it was confirmed that the cam teeth on the rotor side could not be placed on the next cam teeth on the fixed side of the difference half pitch. Therefore, in a state in which the aforementioned phenomena occur in succession, it is also expected that the refill cannot be rotated.

13 to 15 are diagrams for explaining the countermeasures. As shown in Figs. 8 to 10, after the cylindrical member 30 and the torque canceller 31 are configured to form a damping function by the adhesive grease, the rotation is assembled. The drive mechanism 21 is executed.

That is, FIG. 13 shows the final assembly work of the rotary drive mechanism 21 in which the cylindrical member 30 is fitted into the upper cam forming member 27, and the adhesive grease G is applied to the aforementioned rotor housed in the upper cam forming member 27 in the circumferential direction. The barrel portion of 26. In this state, the end portion of the upper cam forming member 27 is slightly inserted into the opening portion of the cylindrical member 30, and as shown in FIG. 14, the adhesive grease G is closed to the opening portion and the upper cam formed in the cylindrical member 30. A space portion between the ends of the member 27 is formed.

Further, as shown in FIG. 15, the end peripheral side surface of the upper cam forming member 27 is fitted to the inner surface of the opening of the cylindrical member 30, and the rotary driving mechanism 21 is assembled, and the adhesive grease G is formed into the upper cam. The member 27 is between the barrel portion of the rotor 26. Thereby, the rotor 26 is provided with the viscous impedance in the rotational direction by the above-mentioned adhesive grease G.

According to the configuration described above, since the rotor 26 is provided with a slight viscous impedance in the rotational direction by the adhesive grease G, the rotor 26 is subjected to vibration or the like at the instant when the rotor 26 is in the free state. 26 can also be held by the adhesive grease G. Further, when the first or second cam surface of the rotor 26 is engaged with the first or second fixed cam surface, it does not affect the rotation.

Thereby, it is possible to provide a mechanical pencil that performs a rotation motion of the refill with the writing operation. In addition, as the adhesive grease G which imparts a viscous resistance in the direction of rotation of the rotor 26, the same grease as that used for imparting a damping function to the above-described torque canceller 31 can be used.

In the embodiment described above, in a relationship in which a relatively thick grip member is attached to the barrel, the rotation driving mechanism 21 of the cartridge is housed in the rear shaft 17 that is rearward than the attachment position of the grip member, and is rotated. The drive mechanism 21 is coupled to the chuck 5 via a relay pipe 22. As in this example, when the relay tube 22 having a relatively long size is used, the relay tube 22 is preferably formed of the above-described flexible material together with the core case 3, for example, made of polypropylene or the like.

The relay tube 22 formed of the flexible material described above has an error in molding of the components constituting the rotary drive mechanism 21 or an error in assembly thereof, and a pen including the relay tube 22 or the chuck 5 The eccentricity or the like caused by the mutual connection of the rotational driving portions of the core can also utilize the flexibility of the relay tube 22 to ensure the normal rotational driving operation of the refill.

Further, the mechanical pencil of the present invention exhibits a particularly remarkable effect when a relatively long relay tube is used as shown in the embodiment, but the present invention is not limited thereto, and even if a relatively short relay tube is used, it can be enjoyed. The same effect as the small degree.

1. . . Pen tip (pen tip)

2. . . Front axle

3. . . Core box

5. . . Chuck

6. . . Clipper

8. . . Slider

13. . . Grip member

14. . . Shaft joint

17. . . Rear axle

18. . . Outer shaft

twenty one. . . Rotary drive mechanism

twenty two. . . Relay member (relay tube)

twenty four. . . Shaft spring

26. . . Rotor

26a. . . First cam surface

26b. . . Second cam surface

27. . . Upper cam forming member

27a. . . First fixed cam surface

28. . . Lower cam forming member

28a. . . Second fixed cam surface

30. . . Cylindrical member

30b. . . Injection hole

30c. . . Concave portion (space portion)

31. . . Torque eliminator

31a. . . Convex member

31b. . . Ditch

31c. . . Scratch part (second space part)

32. . . Buffer spring

35. . . Pressing bar (pressing member)

36. . . Return spring

37. . . Eraser

38. . . Press cover

Fig. 1 is a cross-sectional view showing the front half of the mechanical pencil of the present invention.

Fig. 2 also shows a cross-sectional view of the rear half.

Fig. 3 is a front elevational view and a central cross-sectional view showing the continuous release unit of the refill and the rotary drive mechanism of the refill.

4 is a cross-sectional view showing the configuration of a front axle and a grip member.

Fig. 5 is an enlarged cross-sectional view showing the rotary drive mechanism of the refill.

Fig. 6 is a schematic view showing the rotational driving action of the rotor provided in the rotation drive mechanism in order.

Fig. 7 is a schematic view showing the rotational driving action of the rotor, continued from Fig. 6;

8 is an external perspective view and a cross-sectional view of a torque canceller provided in a rotation drive mechanism.

Fig. 9 is a cross-sectional view showing the relationship between a torque canceller provided in a rotary drive mechanism and a cylindrical member.

Fig. 10 is a cross-sectional view taken along line a-a, line b-b, and line c-c of Fig. 9 as seen in the direction of arrow printing.

FIG. 11 is a perspective view of the rotor in which the angle of the configuration example of the display unit that displays the rotation state of the rotor is changed.

Fig. 12 is a view showing the appearance of the mechanical pencil of the present invention in a state of rotation of the rotor.

Figure 13 is a cross-sectional view showing the final assembly work of the rotary drive mechanism.

Figure 14 is a cross-sectional view showing the assembly work continued from Figure 13;

Figure 15 is a cross-sectional view showing the assembly work continued from Figure 14.

7. . . Pipe joint

9. . . Front end tube

8. . . Slider

twenty two. . . Trunk tube

twenty one. . . Rotary drive mechanism

3. . . Core box

10. . . Hold the chuck

5. . . Chuck

6. . . Clipper

11. . . Chuck spring

4. . . Core box connector

Claims (5)

A mechanical pencil is configured to release and retract the refill according to the forward and backward movement of the collet according to the pressing operation of the pressing member, thereby continuously releasing the refill toward the front, and constituting the state in which the collet holds the refill a mechanical pencil that can be mounted in the barrel in a manner that can be rotated forward and backward, and can be rotated around the shaft core, and the grip member is mounted to surround the shaft barrel, and is characterized in that it can reciprocate axially a rotation driving mechanism that converts the motion into a rotary motion is housed in the shaft cylinder that is located further rearward than the handle member, and connects the rotation driving mechanism and the chuck through a relay member formed by a flexible material. The relay member transmits the front and rear operations caused by the writing pressure of the cartridge held by the chuck to the reciprocating motion, and the rotation driving mechanism is configured to be generated by the rotation driving mechanism via the relay member. The rotary motion is conveyed to the collet. The mechanical pencil according to claim 1, wherein the relay member is disposed coaxially outside the core case connected to the rear end portion of the chuck. The automatic pencil according to the first or second aspect of the invention, wherein the rotary drive mechanism includes a rotor to which the relay member is connected, the rotor is formed in an annular shape, and an end surface thereof in the axial direction The other end faces are respectively formed with first and second cam faces, and first and second fixed cam faces respectively facing the first and second cams, and the aforementioned clips by the writing pressure In the retreating operation of the head, the first cam surface of the annular rotor abuts against the first fixed cam surface and engages The second cam surface of the rotor is brought into contact with the second fixed cam surface by the release of the writing pressure, and the first cam surface on the rotor side is engaged with the first fixed cam surface. The second cam surface on the side and the second fixed cam surface are set to be in a phase-shifted relationship with respect to 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. Then, the first cam surface on the rotor side and the first fixed cam surface are set to be in a phase-shifted relationship with respect to one tooth of the cam in the axial direction. In the above-described rotation driving mechanism, the rotation driving mechanism is configured such that the second cam surface of the rotor abuts against the second fixed cam surface when the writing pressure is released. A buffer spring in the state of the occlusion. The mechanical pencil according to claim 4, wherein the rear end portion of the rotor of the rotation drive mechanism and the buffer spring are interposed between the rear end portion and the rear end portion of the rotor. The torque canceller prevents the rotational motion of the aforementioned rotor from being transmitted to the aforementioned buffer spring.