JP5806538B2 - mechanical pencil - Google Patents

Description

  The present invention relates to a mechanical pencil in which a lead holder rotates in one direction by a reciprocating movement of a tip member caused by writing pressure, and the lead and chuck are rotated as the lead holder rotates.

In general, writing instruments are written with a slight tilt, but when writing with a mechanical pencil tilted, the lead is reduced by one piece, so the end face of the lead becomes elliptical and the writing width gradually increases. It was. Therefore, it was necessary to rotate the mechanical pencil in order to maintain a narrow writing width.
In order to eliminate this point, an opening groove is formed in the inner shaft, and one side wall of the opening groove is largely inclined at the front part and formed substantially perpendicular to the rear part, and the other side wall is substantially the same. In addition to forming a protrusion that is engaged with the opening groove on the coupling tool, a locking claw is formed at the rear end of the coupling tool, and the coupling tool is provided so as to be rotatable with respect to the inner shaft. A number of cam teeth are formed in the circumferential direction at the front end of the rotating member, the chuck is configured to be slidable in the longitudinal direction with respect to the rotating member and cannot be rotated, and a return spring is provided between the coupling tool and the rotating member. The rotating member is stretched, and the rotating member is urged forward in the longitudinal direction by a spring having a larger mounting load than the return spring to press the rotating member against the inner shaft. The cam teeth are separated from each other as appropriate, and the pen pressure is applied to the core. As a result, the protrusion of the connecting tool connecting the core guide member moves backward along the right side wall of the inner shaft while rotating counterclockwise, and when the locking claw of the connecting tool comes into contact with the cam teeth of the rotating member, the rotating member is moved together with the connecting tool. There is also known a mechanical pencil that rotates counterclockwise and the chuck and the core rotate counterclockwise by a certain amount together with the rotating member. (See Patent Document 1)

  However, in the above mechanical pencil, since the lead, chuck and lead guide member reciprocate simultaneously in the shaft tube and the tip member, the movement of the lead is directly transmitted to the hand holding the shaft tube and is very difficult to write. It was. In addition, when writing pressure is applied to the lead, the lead guide member protruding from the tip member and the retreat of the lead enter the eyes, resulting in discomfort. Moreover, it was not possible to write without rotating the lead by writing pressure.

JP 2010-36391 A

  The problem to be solved is that the core, the chuck and the core guide member reciprocate simultaneously in the shaft cylinder and the tip member, so that the movement of the core is directly transmitted to the hand holding the shaft cylinder, and the writing is difficult. The movement of the core and the core guide member protruding from the tip member enters the eyes, causing discomfort. Furthermore, it is a point which cannot write without rotating the core by writing pressure.

The present invention
“1. It has a front shaft and a rear shaft, a gripping member is fixedly attached to the front shaft, a chuck for holding a core is arranged inside the front shaft, and a fastener is attached to the head of the chuck. fitted to, biasing the chuck longitudinally rearward by the chuck spring, a connector for receiving the fastener that is pressed against the chuck rotatable with respect to appropriate movable slide member in the longitudinal direction by the front inner shaft When the writing is performed by removably screwing a tip member disposed in front of the front shaft to the slide member and writing, the forward movement is performed when the core is pressed against the paper surface and receiving pressure. The gripping member gripped by hand moves forward with respect to the slide member that stops, and the slide member moves forward with respect to the gripping member gripped by hand when the core is separated from the paper surface. A lock having a latching portion that can contact the front end of the shaft. A member is screwed to the tip member so as to be movable in the longitudinal direction, and the lock member is rotated with respect to the tip member to retract the lock member, thereby locking the lock member to the front end of the front shaft. parts abuts, the relative screwed were previously member to the slide member provided with a locking mechanism that can be selectably either impossible to move in the longitudinal direction of the gripping member, first member screwed to the slide member On the other hand, a sliding member formed with a front cam and a rear cam is movable in the longitudinal direction and built in a non - rotatable manner, and a rotating member formed with a front cam and a rear cam is built in the tip member so as to be rotatable. The front cam of the rotating member, the front cam of the sliding member, the rear cam of the rotating member, and the rear cam of the sliding member are configured to contact each other, and a core guide pipe is fixed inside the rotating member. Place the core piece in place and remove the lead holder that holds the lead With the said in piece and the wick holder in the longitudinal direction and configured to non-rotatably moveable relative to the rotating member, the longitudinal said slide member against the previously member screwed to the slide member by writing By reciprocating in the direction, the front cam of the rotating member, the front cam of the sliding member, the rear cam of the rotating member, and the rear cam of the sliding member come into contact with each other, and the rotating member rotates in one direction. , constitute a rotating mechanism for rotating the wick holder every predetermined angle in one direction together with the rotary member, by operating the locking mechanism, allowing moving the slide member in a longitudinal direction relative to the sliding member in this case, writing the rotated core with the rotation of the wick holder by performing, also when the immovable said sliding member relative to said sliding member, the core even if the writing That does not rotate The most important feature.
2. It has a front shaft and a rear shaft, a fixing member is fixedly attached to the front shaft, a chuck for holding a core is arranged inside the front shaft, and a fastener is externally fitted to the head of the chuck, The chuck is urged rearward in the longitudinal direction by a chuck spring, and a coupling member that receives the fastener pressed by the chuck is configured to be rotatable with respect to a slide member that can be appropriately moved in the longitudinal direction within the front shaft. When the tip member arranged in front of the front shaft is detachably screwed onto the slide member and writing is performed, the forward movement stops in a state where the core is pressed against the paper surface and receiving writing pressure. The gripping member gripped by hand with respect to the slide member moves forward, and when the core is separated from the paper surface, the slide member moves forward with respect to the gripping member gripped by hand, and the cam portion is moved backward. The lock member formed by stretching the tip portion A locking portion is formed on the cam portion of the lock member, a cam portion having a recess notched rearward is formed on the front shaft, and the cam portion of the lock member is In a state where it is aligned with the recess of the front shaft, the front shaft can be moved forward in the longitudinal direction with respect to the tip member screwed to the slide member, the lock member is rotated with respect to the tip member, and the lock member in the state in which the engaging portion of the is in contact with the cam portion deviated from the recess of the front axle, a locking mechanism the front axle relative to the destination member screwed to the slide member that such stuck longitudinally forward A sliding member formed with a front cam and a rear cam with respect to a tip member screwed to the slide member is movable in the longitudinal direction and cannot be rotated, and the front member has a front cam and a rear cam. The rotating member formed with The front cam of the rolling member, the front cam of the sliding member, the rear cam of the rotating member, and the rear cam of the sliding member are configured to contact each other, and a core guide pipe is fixed inside the rotating member. A piece holder is arranged, a lead holder for holding a lead is attached to the middle piece, the middle piece and the lead holder are movable with respect to the rotating member in the longitudinal direction and are not rotatable, and the slide is formed by writing. By reciprocating the sliding member in the longitudinal direction with respect to the tip member screwed to the member, the front cam of the rotating member, the front cam of the sliding member, the rear cam of the rotating member, and the sliding member The rotating cam rotates in one direction when the rear cam comes into contact, and the rotating member is configured to rotate the core holder in one direction at a predetermined angle together with the rotating member. Longitudinal direction of the sliding member relative to the member If the stylus holder is rotated, the wick is rotated along with the rotation of the wick holder, and if the sliding member is not movable relative to the slide member, the writing is performed. The most important feature is that the core does not rotate even if the process is performed.
3. It has a front shaft and a rear shaft, a fixing member is fixedly attached to the front shaft, a chuck for holding a core is arranged inside the front shaft, and a fastener is externally fitted to the head of the chuck, The chuck is urged rearward in the longitudinal direction by a chuck spring, and a coupling member that receives the fastener pressed by the chuck is configured to be rotatable with respect to a slide member that can be appropriately moved in the longitudinal direction within the front shaft. When the tip member arranged in front of the front shaft is detachably screwed onto the slide member and writing is performed, the forward movement stops in a state where the core is pressed against the paper surface and receiving writing pressure. When the gripping member gripped by hand with respect to the slide member advances and the core is separated from the paper surface, the slide member moves forward with respect to the gripping member gripped by hand, and the front end of the front shaft Member having an engaging portion capable of contacting By engaging with the tip member so as to be movable in the longitudinal direction and rotating the lock member relative to the tip member to retract the lock member, a locking portion of the lock member is placed at the front end of the front shaft. A locking mechanism is provided that can select whether or not the gripping member can be moved in the longitudinal direction with respect to the tip member screwed to the slide member, and the front member is forward of the tip member screwed to the slide member. A sliding member formed with a cam and a rear cam is movable in the longitudinal direction and built in a non-rotatable manner, and a rotating member formed with a front cam and a rear cam is built in the tip member so as to be pivotable, A front cam of the rotating member, a front cam of the sliding member, a rear cam of the rotating member, and a rear cam of the sliding member are configured to come into contact with each other, and a core holder that holds the core is attached to the rotating member. With respect to the tip member screwed to the slide member by By reciprocating the sliding member in the longitudinal direction, the front cam of the rotating member, the front cam of the sliding member, the rear cam of the rotating member, and the rear cam of the sliding member come into contact with each other. Comprises a rotation mechanism that rotates in one direction and rotates the core holder in one direction at a predetermined angle, and operates the lock mechanism so that the slide member is elongated relative to the slide member. When it is possible to move in the direction, by rotating the core with the rotation of the core holder by writing, and when the sliding member is not movable with respect to the slide member, The main feature is that the core does not rotate even when writing.
4). It has a front shaft and a rear shaft, a fixing member is fixedly attached to the front shaft, a chuck for holding a core is arranged inside the front shaft, and a fastener is externally fitted to the head of the chuck, The chuck is urged rearward in the longitudinal direction by a chuck spring, and a coupling member that receives the fastener pressed by the chuck is configured to be rotatable with respect to a slide member that can be appropriately moved in the longitudinal direction within the front shaft. When the tip member arranged in front of the front shaft is detachably screwed onto the slide member and writing is performed, the forward movement stops in a state where the core is pressed against the paper surface and receiving writing pressure. The gripping member gripped by hand with respect to the slide member moves forward, and when the core is separated from the paper surface, the slide member moves forward with respect to the gripping member gripped by hand. Front cam and rear A sliding member formed with a front cam and a rear cam formed in the tip member is rotatably incorporated, and is movable in the longitudinal direction. A cam, a front cam of the sliding member, a rear cam of the rotating member, and a rear cam of the sliding member are configured to come into contact with each other, and an inner frame having a core guide pipe fixed inside the rotating member is disposed. A core holder for holding a core is attached to the middle piece, the middle piece and the core holder are movable in the longitudinal direction with respect to the rotating member, and cannot be rotated, and are screwed into the slide member by writing. By reciprocating the sliding member in the longitudinal direction with respect to the tip member, the front cam of the rotating member, the front cam of the sliding member, the rear cam of the rotating member, and the rear cam of the sliding member abut against each other. The rotating member rotates in one direction in contact with the rotating member. Constitute a rotation mechanism for rotating at each predetermined angle wick holder in one direction, arranged locking member exposed to the outside to form a large diameter rear inwardly of the front axle, it is formed in the front shaft A front threaded portion of the front shaft is formed by screwing a male thread portion formed on the lock member into a female thread portion so as to be movable in the longitudinal direction and rotating the lock member to move the front shaft forward in the longitudinal direction. A lock mechanism that prevents the sliding member from reciprocating in the longitudinal direction when the protruding portion formed at the rear portion of the sliding member is pushed by a key formed on the inner surface to move the sliding member forward; Provided, when the lock mechanism is operated and the sliding member is movable in the longitudinal direction with respect to the sliding member, the core is rotated along with the rotation of the core holder by writing, In addition, the sliding member is connected to the sliding member. When the movement is impossible, the most important feature is that the core does not rotate even if writing is performed. Is.

  According to the present invention, by operating the lock mechanism, the lead holder rotates in one direction by the reciprocating motion of the tip member due to the writing pressure, and the lead and the chuck rotate as the lead holder rotates. The advantage that the state in which the is not rotated can be arbitrarily selected is obtained.

FIG. 1 is a cross-sectional view showing a mechanical pencil of Example 1 of the present invention. (Example 1) FIG. 2 is an enlarged cross-sectional view of a main part showing the mechanical pencil according to the first embodiment of the present invention. (Example 1) 3 is an enlarged cross-sectional view taken along line AA of FIG. (Example 1) FIG. 4 is an enlarged explanatory view of a main part showing a developed state of the rotating mechanism by the sliding member and the rotating member in FIG. (Example 1) FIG. 5 is a cross-sectional view of the main part showing a state in which writing pressure is applied to the mechanical pencil of the first embodiment. (Example 1) FIG. 6 is an enlarged explanatory view of a main part showing a developed state of the rotating mechanism of the sliding member and the rotating member in FIG. (Example 1) FIG. 7 is an enlarged explanatory view of a main part showing a developed state of the rotating mechanism of the sliding member and the rotating member in a state where the writing pressure is released from the state of FIG. (Example 1) FIG. 8 is an enlarged cross-sectional view of the main part of the mechanical pencil of the first embodiment showing a state in which the core is prevented from rotating by the lock mechanism. (Example 1) FIG. 9 is an enlarged cross-sectional view showing a main part of the mechanical pencil according to the second embodiment of the present invention. (Example 2) FIG. 10 is an enlarged explanatory view of a main part showing a developed state of the cam part of the lock member and the cam part of the front shaft in FIG. 9. (Example 2) FIG. 11 is an enlarged cross-sectional view of a main part of the mechanical pencil according to the second embodiment, showing a state in which the core is prevented from rotating by the lock mechanism. (Example 2) FIG. 12 is an enlarged explanatory view of a main part showing a developed state of the cam portion of the lock member and the cam portion of the front shaft in FIG. (Example 2) FIG. 13 is an enlarged cross-sectional view of a main part showing a mechanical pencil of Example 3 of the present invention. (Example 3) FIG. 14 is a cross-sectional view of the main part of the mechanical pencil of the third embodiment showing a state in which the core is prevented from rotating by the lock mechanism. (Example 3) FIG. 15 is an enlarged cross-sectional view of a main part showing a mechanical pencil according to a fourth embodiment of the present invention. (Example 4) FIG. 16 is an enlarged explanatory view of a main part showing a developed state of the rotating mechanism by the sliding member and the rotating member in FIG. (Example 4) FIG. 17 is an enlarged cross-sectional view of a main part showing a state in which writing pressure is applied to the mechanical pencil of Example 4. (Example 4) FIG. 18 is an enlarged explanatory view of a main part showing a developed state of the rotating mechanism of the sliding member and the rotating member in FIG. (Example 4) FIG. 19 is an enlarged cross-sectional view of a main part showing a state in which the lead is prevented from rotating by the lock mechanism in the mechanical pencil of the fourth embodiment. (Example 4) FIG. 20 is an enlarged cross-sectional view of the main part showing the mechanical pencil of Example 5 of the present invention. (Example 5) FIG. 21 is an enlarged plan view of a main part showing the mechanical pencil of FIG. (Example 5)

  The present invention rotates the lead holder by reciprocating the slide member with respect to the gripping member in the longitudinal direction by writing pressure, and the lead and chuck are rotated by rotating the lead holder, and the gripping mechanism is operated by operating the lock mechanism. A mechanical pencil has been realized that allows the sliding member to move in the longitudinal direction relative to the member.

  Hereinafter, the mechanical pencil according to the first embodiment of the present invention will be described with reference to FIGS. 1, 2, 3, 4, 5, 6, 7, and 8. Moreover, let the left side of FIG. 1 be the front, and let the right side be back. First, in FIG.1 and FIG.2, the holding member 1 comprised with soft materials, such as a silicone rubber, is fixed and attached to the front shaft 2. FIG. The slide member 3 is inserted into the front shaft 2 from the front and the fixed piece 4 is inserted from the rear, and the slide member 3 and the fixed piece 4 are press-fitted and fixed. An inner flange 2A of the front shaft 2 is positioned between the rear end of the slide member 3 and the outer stage 4A of the fixed piece 4, and the inner flange 2A of the front shaft 2 is located between the rear end of the slide member 3 and the fixed piece 4. The outer stage 4A is configured to be movable back and forth as appropriate. Further, four key grooves 3A penetrating at equal intervals in the circumferential direction are formed in the front portion of the slide member 3, and the key 2B formed inwardly projecting on the inner surface of the front portion of the front shaft 2 in the key groove 3A. Are engaged, and the slide member 3 and the front shaft 2 are configured to be appropriately movable in the longitudinal direction and not rotatable. Further, a part of the key 2B of the front shaft 2 is configured to protrude inward from the key groove 3A through which the slide member 3 passes.

  The mechanical part of the mechanical pencil includes a chuck 5 having a head portion 5A divided into several parts, a fastener 6 fitted to the head portion 5A of the chuck 5, a connector 7 fixed to the rear portion of the chuck 5, and a connector 7. A pipe-shaped core tank 8 to be press-fitted and fixed, a connecting tool 9 for receiving the fastener 6, and a chuck spring 10 attached between the connecting tool 9 and the connector 7 with a load of about 100 g. Further, a front O-ring 11 made of a soft material such as rubber is attached to the front portion of the core tank 8 in contact with the outer casing 7 A of the connector 7.

  The mechanism portion is inserted from the front of the slide member 3, the rear outer collar 9 </ b> A of the coupling member 9 is inserted through the inner collar 3 </ b> B of the sliding member 3, and the inner collar 3 </ b> B of the sliding member 3 is inserted into the front outer collar 9 </ b> B of the coupling tool 9. And the rear outer casing 9A are rotatably engaged.

  A male threaded portion 12A is formed at the rear surface of the front member 12, and a rear male threaded portion 12B is formed at the rear portion located behind the male threaded portion 12A. The keyway is cut out from the rear end and extends forward. 12C is formed at a relative position.

  Next, the lock mechanism will be described. First, a female screw portion 13A is formed on the lock member 13 and a locking portion 13B is extended rearward. The lock member 13 is screwed to the tip member 12 so as to be movable in the longitudinal direction. In addition, the locking portion 13B of the lock member 13 is configured to be able to contact the front end of the front shaft 2. Normally, the locking portion 13B of the lock member 13 and the front end of the front shaft 2 are appropriately separated from each other. If the state shown in FIGS. The shaft 2 is movable in the longitudinal direction.

  Further, a rotating mechanism for rotating the rotating member 14 will be described. As shown in FIG. 4, the rotating member 14 includes a front cam 14A formed on the rear surface of the front outer casing and a rear cam 14B formed on the front surface of the rear outer casing. The front cam 14A of the rotating member 14 includes a large number of inclined surfaces 14C that are inclined rearward in the right rotation direction, and a vertical surface 14D that is positioned between the inclined surfaces 14C and 14C. Further, the rear cam 14B of the rotating member 14 includes a large number of inclined surfaces 14E that are inclined forward in the right rotation direction, and a vertical surface 14F that is positioned between the inclined surfaces 14E and 14E. Further, a front cam 15A formed on the front end surface and a rear cam 15B formed on the rear stage surface are formed on the inner side of the sliding member 15. The front cam 15A of the sliding member 15 includes a large number of inclined surfaces 15C that are inclined forward in the left rotation direction, and a vertical surface 15D that is positioned between the inclined surfaces 15C and 15C. Further, the rear cam 15B of the sliding member 15 includes a large number of inclined surfaces 15E that are inclined rearward in the counterclockwise direction, and a vertical surface 15F that is positioned between the inclined surfaces 15E and 15E. Further, the inclined surface 15C of the front cam 15A of the sliding member 15 and the inclined surface 15E of the rear cam 15B are the same number, and the vertical surface 15D of the front cam 15A and the vertical surface 15F of the rear cam 15B are aligned in the longitudinal direction. Further, the inclined surface 14C of the front cam 14A of the rotating member 14 and the inclined surface 14E of the rear cam 14B are the same in number as the inclined surface 15C of the front cam 15A and the inclined surface 15E of the rear cam 15B of the sliding member 15, and the front cam 14A. The vertical surface 14F of the rear cam 14B is located substantially at the center of the inclined surface 14C. The inner portion of the sliding member 15 is attached between the front cam 14A and the rear cam 14B of the rotating member 14, the front cam 14A of the rotating member 14 and the front cam 15A of the sliding member 15 face each other, and the rotating member 14 The rear cam 14B and the rear cam 15B of the sliding member 15 are configured to face each other. Further, the sliding member 15 is configured to be able to move back and forth appropriately in the longitudinal direction with respect to the rotating member 14, and slides with the front cam 14A of the rotating member 14, the front cam 15A of the sliding member 15, and the rear cam 14B of the rotating member 14. The rear cam 15B of the member 15 is configured to be able to abut.

  Further, a key groove 14G extending from the rear to the front in the longitudinal direction is formed on the inner surface of the rotating member 14 at a relative position. Further, a lead holder 18 is attached to the middle piece 17 having the lead guide pipe 16 fixed to the front part. A key 17 </ b> A is formed at a relative position on the outer surface of the intermediate piece 17. The middle piece 17 is inserted from the rear side of the rotating member 14, and the key 17 </ b> A of the inner piece 17 is engaged with the key groove 14 </ b> G of the rotating member 14, whereby the middle piece 17 and the core holder 18 are elongated with respect to the rotating member 14. It is configured to be slidable in the direction but not rotatable. The lead holder 18 is made of rubber and holds the lead 19 with a frictional force of about 50 g.

  The rotating member 14 and the sliding member 15 are built in the tip member 12, but a protrusion 15 </ b> G formed at a relative position of the sliding member 15 is inserted into the key groove 12 </ b> C of the tip member 12. Thus, the sliding member 15 is configured to be movable in the longitudinal direction but not rotatable. Further, the protrusion 15G of the sliding member 15 protrudes outward in the circumferential direction from the rear peripheral surface of the tip member 12. Further, a front spring 20 is attached between the inner stage 12D of the tip member 12 and the outer stage 15H of the sliding member 15, and the sliding member 15 is urged rearward in the longitudinal direction.

  The tip member 12 is detachably screwed onto the slide member 3, and a rotating member 14 is rotatably incorporated between the locking step 12E of the tip member 12 and the front end of the connector 9. The rear cam 15B of the sliding member 15 urged rearward in the longitudinal direction by the front spring 20 attached to the extent is brought into contact with the rear cam 14B of the rotating member 14, and the protrusion 15G of the sliding member 15 is brought into contact with the front shaft 2. The key 2B is brought into contact. Then, the inner flange 2 </ b> A of the front shaft 2 is brought into contact with the outer stage 4 </ b> A of the fixed piece 4.

  Further, a cylindrical weight body 21 is inserted from the rear of the front shaft 2, and the weight body 21 is loosely fitted between the outer surface of the core tank 8 and the inner surface of the fixed piece 4 so as to be slidable in the longitudinal direction. The gap between the outer surface of the weight body 21 and the inner surface of the fixed piece 4 is narrower than the gap between the outer surface of the core tank 8 and the inner surface of the weight body 21.

  A clip 23 is integrally formed on the rear shaft 22 and a core 24 is inserted from the front of the rear shaft 22. A rear O-ring 25 made of a soft material such as rubber is press-fitted and fixed to the front end of the inner collar 24A of the core 24. Further, the pressing member 26 is inserted from the rear of the rear shaft 22, the locking protrusion 26 </ b> A of the pressing member 26 is locked to the opening window 24 </ b> B of the core 24, and the front end of the pressing member 26 is connected to the inner flange 24 </ b> A of the core 24. It abuts and connects the core 24 and the pressing member 26. Further, a return spring 27 is attached between the inner flange 22A of the rear shaft 22 and the outer stage 26B of the pressing member 26 with an attachment load of about 300 g, and the pressing member 26 is urged rearward in the longitudinal direction. An inner hole 26 </ b> C is formed in the pressing member 26 so that the core 19 can pass therethrough, and an eraser 28 is attached to the rear inner side 26 </ b> D of the pressing member 26. A knob 29 is detachably fitted to the rear outer side 26E of the pressing member 26 so as to cover the eraser 28.

  The rear shaft 22 is detachably screwed to the front shaft 2 and a spare core 19 is accommodated in the core tank 8 to form a swing-out type mechanical pencil.

  When writing with the mechanical pencil, the core 19 is pressed against the paper surface, and as shown in FIG. 5, the chuck 5 that receives the writing pressure, the fastener 6, the connector 9, the slide member 3, the fixing piece 4, and the tip member 12. Although the rotary member 14 is stopped, the front shaft 2 and the gripping member 1 gripped by hand with respect to the slide member 3 move forward, and the sliding member 15 in which the protrusion 15G is in contact with the key 2B of the front shaft 2. Further, the front spring 2 moves forward while compressing the front spring 20. Then, the front cam 15A of the sliding member 15 contacts the front cam 14A of the rotating member 14, and the inclined surface 15C of the front cam 15A of the sliding member 15 contacts the inclined surface 14C of the front cam 14A of the rotating member 14. However, since the protrusion 15G is inserted into the key groove 12C of the tip member 12 and the sliding member 15 cannot rotate, the inclined surface 14C of the front cam 14A of the rotating member 14 is the front cam of the sliding member 15. By sliding substantially half of the inclined surface 15C of 15A, the rotating member 14 rotates clockwise with respect to the front as shown in FIG. Then, since the center piece 17, the core guide pipe 16, and the core holder 18 together with the rotating member 14 rotate to the right, the core 19 also rotates to the right.

  Next, when writing is stopped and the lead core 19 is separated from the paper surface, the tip member 12 and the slide member 3 urged forward by the front spring 20 are moved forward with respect to the front shaft 2 and the gripping member 1 gripped by hand. . Then, together with the slide member 3, the connector 9, the fastener 6, the chuck 5, the rotating member 14, the center piece 17, the lead guide pipe 16, and the lead holder 18 move forward together with the lead 19. Then, the inclined surface 14E of the rear cam 14B of the rotating member 14 contacts the inclined surface 15E of the rear cam 15B of the sliding member 15, and the inclined surface 14E of the rear cam 14B of the rotating member 14 is the rear cam 15B of the sliding member 15. As shown in FIG. 7, the rotating member 14 rotates to the right with respect to the front. Further, the outer stage 4A of the fixed piece 4 comes into contact with the inner flange 2A of the front shaft 2 and returns to the state shown in FIGS. Then, the inclined surface 14E of the rear cam 14B of the rotating member 14 passes over the inclined surface 15E of the rear cam 15B of the sliding member 15 and comes into contact with the inclined surface 15E on the right side, as shown in FIG. 19 rotates to the right by one inclined surface 14E dimension of the rear cam 14B of the rotating member 14. The chuck 5, the connector 7 and the core tank 8 are separated from the pressing member 26, and the gap between the weight body 21 and the core tank 8 is larger than the gap between the fixed piece 4 and the weight body 21, so that the core There is no fear that the rotation of the tank 8 is hindered by the pressing member 26 or the weight body 21.

  When the core 19 is worn by writing, when the gripping member 1 gripped by hand is shaken, the weight body 21 first moves rearward and comes into contact with the rear O-ring 25. When the gripping member 1 is shaken forward by the reaction, the weight body 21 moves forward and contacts the front O-ring 11. The chuck 5, the connector 7 and the lead tank 8 are moved forward by the inertial force of the weight body 21, and a fixed amount of lead 19 is fed out in the same manner as a conventionally known swing-out mechanical pencil.

  When it is desired to stop the rotation of the core 19, the lock member 13 constituting the lock mechanism is rotated and retracted, and the locking portion 13B is brought into contact with the front shaft 2 to be in the state shown in FIG. Then, the front shaft 2 cannot move in the longitudinal direction with respect to the tip member 12 and the slide member 3, and the core 19 does not rotate even if writing is performed.

  Further, if the middle piece 17 and the core guide pipe 16 are retracted when being carried, the core guide pipe 16 can be immersed in the tip member 12.

  Hereinafter, the mechanical pencil according to the second embodiment of the present invention will be described with reference to FIGS. 9, 10, 11, and 12. The same members as those in FIG. 2 are denoted by the same reference numerals, and the description thereof is omitted. First, the surface rear portion 112F of the tip member 112 is formed to be raised, and a protrusion 112G extending in the circumferential direction is formed on the surface rear portion 112F. A key groove 112 </ b> C that is cut out from the rear end and extends at the rear portion of the tip member 112 is formed at a relative position. Moreover, while forming the recessed strip part 113C extended in the circumferential direction on the inner surface of the lock member 113, the cam part 113D extended backward is formed in a relative position. The cam portion 113D is formed with a locking portion 113B and a stopper portion 113E extending further rearward than the locking portion 113B. In addition, the cam portion 102 </ b> C of the front shaft 102 is formed with a recess 102 </ b> D notched rearward at a relative position. The recess 113C of the lock member 113 is attached to the protrusion 112G of the tip member 112 so as to be rotatable. Further, the lock mechanism can be configured such that the cam portion 113D of the lock member 113 and the cam portion of the front shaft 102 are formed when the cam portion 113D of the lock member 113 is brought into the state shown in FIGS. The front shaft 102 can move in the longitudinal direction with respect to the tip member 112 and the slide member 3 by appropriately separating 102C. Therefore, in this state, the rotating mechanism of the rotating member 14 works, and the core 19 rotates when writing is performed.

  Further, when writing is to be performed while stopping the rotation of the lead 19, if the lock member 113 constituting the lock mechanism is rotated to the right with respect to the front, the stopper portion 113 </ b> E of the lock member 113 becomes the cam portion 102 </ b> C of the front shaft 102. 11A and 12B, the rotation of the lock member 113 is stopped by abutting against the edge 102E of the recess 102D formed in FIG. 11, and the locking portion 113B of the lock member 113 contacts the cam portion 102C of the front shaft 102. It becomes a state. In this state, the front shaft 102 cannot move forward in the longitudinal direction with respect to the tip member 112 and the slide member 3, and the core 19 does not rotate even if writing is performed.

  Hereinafter, the mechanical pencil according to the third embodiment of the present invention will be described with reference to FIGS. 13 and 14. In addition, the same member as FIG. 1 attaches | subjects the same code | symbol, and abbreviate | omits the description. First, the gripping member 1 made of a soft material is fixedly attached to the front shaft 202. In addition, the locking mechanism forms a female screw portion 202F at the rear portion of the front shaft 202. Further, the male screw portion 213F is formed at the front portion of the lock member 213, and the rear portion 213G is formed with a large diameter. The male screw portion 213F of the lock member 213 is screwed into the female screw portion 202F of the front shaft 202 so as to be movable in the longitudinal direction, and the rear portion 213G of the lock member 213 covers the outer casing 104B of the fixing piece 104. The In the state shown in FIG. 13, the sliding member 15 is configured to be movable in the longitudinal direction with respect to the tip member 212. Therefore, in this state, the rotating mechanism of the rotating member 14 works, and the core 19 rotates when writing is performed.

  When it is desired to stop the rotation of the core 19, the lock member 213 constituting the lock mechanism is rotated to move the front shaft 202 forward in the longitudinal direction. Then, the state shown in FIG. 14 is obtained, the slide member 15 is moved forward by being pushed by the key 202B of the front shaft 202, and the protrusion 15G of the slide member 15 is formed at the front end edge of the key groove 212C of the tip member 212. Abut. In this state, the front shaft 202 and the sliding member 15 cannot reciprocate in the longitudinal direction with respect to the tip member 212 and the slide member 3, and the core 19 does not rotate even if writing is performed.

  In the case of the third embodiment, since the lock member 213 does not hit the finger during writing, there is less possibility of malfunction.

  Hereinafter, a mechanical pencil according to a fourth embodiment of the present invention will be described with reference to FIGS. 15, 16, 17, and 18. The same members as those in FIG. 2 are denoted by the same reference numerals, and the description thereof is omitted. First, in FIG. 15, a male screw portion 312A is formed at the rear surface of the front member 312 and a rear male screw portion 312B is formed at a rear portion located behind the male screw portion 312A and is cut out from the rear end. A key groove 312C extending forward is formed at a relative position. In addition, a rotating member 114 having a lead guide pipe 16 fixed to the front portion is rotatably incorporated in the tip member 312. A rubber core holder 18 that holds the core 19 with a frictional force of about 50 g is attached to the rotating member 114.

  Next, a rotating mechanism for rotating the rotating member 114 will be described. A protrusion 114H is formed on the rotating member 114, a front cam 114A is formed on the front surface of the protrusion 114H, and a rear cam 114B is formed on the rear surface of the protrusion 114H. As shown in FIG. 16, the front cam 114A of the rotating member 114 includes a large number of inclined surfaces 114C inclined forward in the right rotation direction, and a vertical surface 114D positioned between the inclined surfaces 114C and 114C. It consists of. Further, the rear cam 114B of the rotating member 114 includes a large number of inclined surfaces 114E that are inclined rearward in the right rotation direction, and a vertical surface 114F that is positioned between the inclined surfaces 114E and 114E. The sliding member 115 includes a front cam 115A formed on the rear surface of the front inner flange 115I and a rear cam 115B formed on the front surface of the rear inner flange 115J. The front cam 115A of the sliding member 115 is constituted by a large number of inclined surfaces 115C inclined rearward in the counterclockwise direction and a vertical surface 115D positioned between the inclined surfaces 115C and 115C. Further, the rear cam 115B of the sliding member 115 is configured by a large number of inclined surfaces 115E that are inclined forward in the counterclockwise direction, and a vertical surface 115F that is positioned between the inclined surfaces 115E and 115E. Further, the inclined surface 115C of the front cam 115A of the sliding member 115 and the inclined surface 115E of the rear cam 115B are the same in number, and the vertical surface 115F of the rear cam 115B is located at the approximate center of the inclined surface 115C of the front cam 115A. Further, the inclined surface 114C of the front cam 114A of the rotating member 114 and the inclined surface 114E of the rear cam 114B are the same in number as the inclined surface 115C of the front cam 115A and the inclined surface 115F of the rear cam 115B of the sliding member 115, and the front cam 115A. The vertical surface 115D and the vertical surface 115F of the rear cam 115B are aligned in the longitudinal direction. A protrusion 114H of the rotating member 114 is attached between the front cam 115A and the rear cam 115B of the sliding member 115 so that the front cam 114A of the rotating member 114 and the front cam 115A of the sliding member 115 face each other. The rear cam 114B and the rear cam 115B of the sliding member 115 are configured to face each other. Further, the sliding member 115 is configured to be movable back and forth appropriately in the longitudinal direction with respect to the rotating member 114, and slides with the front cam 114A of the rotating member 114, the front cam 115A of the sliding member 115, and the rear cam 114B of the rotating member 114. The rear cam 115B of the member 115 is configured to be able to contact.

  The rotating member 114 and the sliding member 115 are built in the tip member 312, but a protrusion 115 </ b> G formed at a relative position of the sliding member 115 is inserted into the key groove 312 </ b> C of the tip member 312. Thus, the sliding member 115 is configured to be movable in the longitudinal direction but not rotatable. Further, the protrusion 115G of the sliding member 115 protrudes outward from the rear surface of the tip member 312. Further, the front spring 20 is attached between the inner stage 312D of the tip member 312 and the outer stage 115H of the sliding member 115, and the sliding member 115 is urged rearward in the longitudinal direction.

  The tip member 312 is detachably screwed to the slide member 3, and a rotating member 114 is rotatably incorporated between the locking step 312 </ b> E of the tip member 312 and the front end of the connector 9. The front cam 115A of the sliding member 115 urged rearward in the longitudinal direction by the front spring 20 attached at the position is brought into contact with the front cam 114A of the rotating member 114, and the protrusion 115G of the sliding member 115 is brought into contact with the front shaft 2. It is brought into contact with the key 2B. Then, the inner flange 2A of the front shaft 2 is brought into contact with the outer stage 4A of the fixed piece 4 to constitute a swing-out mechanical pencil.

  When writing with the mechanical pencil, the core 19 is pressed against the paper surface, and as shown in FIG. 17, the chuck 5 receiving the writing pressure, the fastener 6, the connecting tool 9, the slide member 3, the fixing piece 4, and the tip member 312. The rotating member 114 is stopped, but the front shaft 2 and the gripping member 1 gripped by hand with respect to the slide member 3 move forward, and the sliding member 115 in which the protrusion 115G is in contact with the key 2B of the front shaft 2. Further, the front spring 2 moves forward while compressing the front spring 20. Then, the rear cam 115B of the sliding member 115 contacts the rear cam 114B of the rotating member 114, and the inclined surface 115E of the rear cam 115B of the sliding member 115 contacts the inclined surface 114E of the rear cam 114B of the rotating member 114. However, since the projecting portion 115G is inserted into the key groove 312C of the leading member 312 and the sliding member 115 cannot rotate, the inclined surface 114E of the rear cam 114B of the rotating member 114 is the rear cam 115B of the sliding member 115. As shown in FIG. 16, the rotation member 114 rotates to the right with respect to the front side. When the lead holder 18 attached to the rotating member 114 is rotated to the right together with the rotating member 114, the lead 19 is also rotated to the right. At this time, the chuck 5 holding the lead 19 also rotates to the right with respect to the slide member 3 together with the fastener 6 and the connector 9.

  Next, when writing is stopped and the core 19 is separated from the paper surface, the tip member 312 and the slide member 3 urged forward by the front spring 20 are moved forward with respect to the front shaft 2 and the gripping member 1 gripped by hand. . Then, together with the slide member 3, the connector 9, the fastener 6, the chuck 5, the rotating member 114, and the lead holder 18 move forward together with the lead 19. Then, the inclined surface 114C of the front cam 114A formed on the rotating member 114 contacts the inclined surface 115C of the front cam 115A formed on the sliding member 115, and the inclined surface 114C of the front cam 114A of the rotating member 114 slides. The rotating member 114 rotates clockwise with respect to the front by sliding along substantially half of the inclined surface 115C of the front cam 115A of the member 115. Further, the outer stage 4A of the fixed piece 4 comes into contact with the inner collar 2A of the front shaft 2 and returns to the state shown in FIG. Then, the inclined surface 114C of the front cam 114A of the rotating member 114 gets over one inclined surface 115C of the front cam 115A of the sliding member 115 and comes into contact with the inclined surface 115C adjacent to the right, and the core 19 is moved to the rear of the rotating member 114. The cam 114B rotates to the right by the dimension of one inclined surface 114E. When the chuck 5, the connector 7 and the lead tank 8 rotate, the lead tank 8 and the pressing member 26 are separated, and the gap between the weight body 21 and the lead tank 8 is larger than the gap between the fixed piece 4 and the weight body 21. Since it is configured to be large, there is no possibility that the rotation of the lead tank 8 is hindered by the pressing member 26 and the weight body 21.

  When the core 19 is worn by writing, when the gripping member 1 gripped by hand is shaken, the weight body 21 first moves rearward and comes into contact with the rear O-ring 25. When the gripping member 1 is shaken forward by the reaction, the weight body 21 moves forward and contacts the front O-ring 11. The chuck 5, the connector 7 and the lead tank 8 are moved forward by the inertial force of the weight body 21, and a fixed amount of lead 19 is fed out in the same manner as a conventionally known swing-out mechanical pencil.

  Further, when it is desired to stop the rotation of the core 19, the lock member 13 constituting the lock mechanism is rotated and retracted, and the locking portion 13B is brought into contact with the front shaft 2 to be in the state shown in FIG. Then, the front shaft 2 cannot move in the longitudinal direction with respect to the tip member 312 and the slide member 3, and the core 19 does not rotate even if writing is performed.

  Hereinafter, based on FIG.20 and FIG.21, the mechanical pencil of Example 5 in this invention is demonstrated. The same members as those in FIG. 2 are denoted by the same reference numerals, and the description thereof is omitted. First, the tip member 412 is made of a transparent or colored synthetic resin, and is printed or transferred with a satin finish or opaque ink on the surface, and a transparent window portion 412H having a part thereof. Are formed at relative positions. Further, a key groove 412C that is cut out from the rear end and extends at the rear portion of the front member 412 is formed at a relative position. Further, the display member 30 is press-fitted and attached to the rotating member 214. The display member 30 is provided with a display 30A so that the rotation of the core 19 can be visually observed. The display 30A of the display member 30 is configured by printing, transferring, sealing, or the like. Although not shown, the display member may be integrated with the rotating member.

  The rotating member 214 is built in the tip member 412 and the protrusion 15G of the sliding member 15 is inserted into the key groove 412C of the tip member 412. Then, the tip member 412 is detachably screwed to the slide member 3 and attached. Then, the display 30 </ b> A formed on the display member 30 becomes visible from the window 412 </ b> H of the tip member 412. Therefore, the rotating member 214 can always be visually observed from the window 412H of the tip member 412.

  In addition, it is preferable to form the window part 412H of the front member 412 in the shape of a circumference, or to form two or more at equal intervals in the circumference direction.

  In the case of the mechanical pencil of Example 5, the display 30A indicating the rotation of the core 19 can be viewed through the window 412H of the tip member 412, and the advantage that the display 30A can be easily viewed during writing is obtained.

  In addition, this invention is not limited to the said Example, In order to simplify description, members, such as a holding member, a front shaft, a tip member, a slide member, a fixed piece, a rotation member, a sliding member, and a connection tool. However, it is only necessary to integrate two or more members by screwing, press-fitting, or the like. Moreover, the core holder attached to the rotating member, the middle piece, and the core guide pipe is not limited to rubber, but a metal plate is formed in a cylindrical shape, and an elastic portion is formed in a part thereof, or the core holder is rotated. An elastic part may be formed on a part of the member, the middle piece, the core guide pipe, or the like to be integrated. Further, in the above embodiment, the vertical surface of the rear cam is positioned substantially at the center of the inclined surface of the front cam. This is for the sake of clarity, and the present invention is not limited to the above embodiment. It is not limited, and when the inclined surfaces of the front cams that contact each other come into contact with each other, the contact surfaces of the rear cams that can contact each other are separated from each other and are approximately half the inclined surface dimension in the circumferential direction. It is only necessary that the front and rear cam inclined surfaces and the rear cam inclined surface are inclined in opposite directions with respect to the circumferential direction.

  The lead can be rotated by the forward / backward movement of the tip member by writing pressure, and can be applied to a mechanical pencil in which the forward / backward movement of the tip member can be selected by a lock mechanism.

DESCRIPTION OF SYMBOLS 1 Gripping member 3 Slide member 5 Chuck 5A Head of chuck 5 6 Fastening tool 9 Connecting tool 10 Chuck spring 15 Sliding member 18 Core holder 19 Core 115 Sliding member

Claims (4)

It has a front shaft and a rear shaft, a fixing member is fixedly attached to the front shaft, a chuck for holding a core is arranged inside the front shaft, and a fastener is externally fitted to the head of the chuck, the chuck urges longitudinally rearward by a chuck spring, and configured to be rotatable with respect to appropriate movable slide member connector for receiving the fastener that is pressed against the chuck longitudinally the front in the axial When the tip member arranged in front of the front shaft is detachably screwed onto the slide member and writing is performed, the forward movement stops in a state where the core is pressed against the paper surface and receiving writing pressure. said slide member said gripping member which is gripped by the hand to move forward, the core release from paper, configured to the slide member relative to said gripping member which is gripped by the hand is advanced, the front end of the front shaft Member having an engaging portion capable of contacting By engaging with the tip member so as to be movable in the longitudinal direction and rotating the lock member relative to the tip member to retract the lock member, a locking portion of the lock member is placed at the front end of the front shaft. contact, the relative screwed were previously member to the slide member provided with a locking mechanism that can be selectably either impossible to move in the longitudinal direction of the gripping member, prior to the previous member screwed to the slide member A sliding member formed with a cam and a rear cam is movable in the longitudinal direction and built in a non - rotatable manner, and a rotating member formed with a front cam and a rear cam is built in the tip member so as to be pivotable, The front cam of the rotating member, the front cam of the sliding member, the rear cam of the rotating member, and the rear cam of the sliding member are configured to contact each other, and a core guide pipe is fixed inside the rotating member. Place the piece and attach the lead holder to hold the lead to the middle piece The in piece and the wick holder in the longitudinal direction and configured to non-rotatably movable relative to the rotating member, the sliding member against the previously member screwed to the slide member by writing in the longitudinal direction By reciprocating, the front cam of the rotating member, the front cam of the sliding member, the rear cam of the rotating member, and the rear cam of the sliding member come into contact with each other, and the rotating member rotates in one direction. constitute a rotation mechanism for rotating at every predetermined angle with the rotating member to the wick holder in one direction, by operating the locking mechanism, when the movable said sliding member in the longitudinal direction relative to the sliding member , the rotate the core with the rotation of the wick holder, also when the immovable said sliding member relative to said sliding member, the core even if the writing is rotated by performing the writing Not to feature Mechanical pencil to do. It has a front shaft and a rear shaft, a fixing member is fixedly attached to the front shaft, a chuck for holding a core is arranged inside the front shaft, and a fastener is externally fitted to the head of the chuck, The chuck is urged rearward in the longitudinal direction by a chuck spring, and a coupling member that receives the fastener pressed by the chuck is configured to be rotatable with respect to a slide member that can be appropriately moved in the longitudinal direction within the front shaft. When the tip member arranged in front of the front shaft is detachably screwed onto the slide member and writing is performed, the forward movement stops in a state where the core is pressed against the paper surface and receiving writing pressure. The gripping member gripped by hand with respect to the slide member moves forward, and when the core is separated from the paper surface, the slide member moves forward with respect to the gripping member gripped by hand, and the cam portion is moved backward. The lock member formed by stretching the tip portion A locking portion is formed on the cam portion of the lock member, a cam portion having a recess notched rearward is formed on the front shaft, and the cam portion of the lock member is In a state where it is aligned with the recess of the front shaft, the front shaft can be moved forward in the longitudinal direction with respect to the tip member screwed to the slide member, the lock member is rotated with respect to the tip member, and the lock member in the state in which the engaging portion of the is in contact with the cam portion deviated from the recess of the front axle, a locking mechanism the front axle relative to the destination member screwed to the slide member that such stuck longitudinally forward A sliding member formed with a front cam and a rear cam with respect to a tip member screwed to the slide member is movable in the longitudinal direction and cannot be rotated, and the front member has a front cam and a rear cam. The rotating member formed with The front cam of the rolling member, the front cam of the sliding member, the rear cam of the rotating member, and the rear cam of the sliding member are configured to contact each other, and a core guide pipe is fixed inside the rotating member. A piece holder is arranged, a lead holder for holding a lead is attached to the middle piece, the middle piece and the lead holder are movable with respect to the rotating member in the longitudinal direction and are not rotatable, and the slide is formed by writing. By reciprocating the sliding member in the longitudinal direction with respect to the tip member screwed to the member, the front cam of the rotating member, the front cam of the sliding member, the rear cam of the rotating member, and the sliding member The rotating cam rotates in one direction when the rear cam comes into contact, and the rotating member is configured to rotate the core holder in one direction at a predetermined angle together with the rotating member. Longitudinal direction of the sliding member relative to the member If the stylus holder is rotated, the wick is rotated along with the rotation of the wick holder, and if the sliding member is not movable relative to the slide member, the writing is performed. A mechanical pencil characterized in that the core does not rotate even if the stylus is used. It has a front shaft and a rear shaft, a fixing member is fixedly attached to the front shaft, a chuck for holding a core is arranged inside the front shaft, and a fastener is externally fitted to the head of the chuck, The chuck is urged rearward in the longitudinal direction by a chuck spring, and a coupling member that receives the fastener pressed by the chuck is configured to be rotatable with respect to a slide member that can be appropriately moved in the longitudinal direction within the front shaft. When the tip member arranged in front of the front shaft is detachably screwed onto the slide member and writing is performed, the forward movement stops in a state where the core is pressed against the paper surface and receiving writing pressure. When the gripping member gripped by hand with respect to the slide member advances and the core is separated from the paper surface, the slide member moves forward with respect to the gripping member gripped by hand, and the front end of the front shaft Member having an engaging portion capable of contacting By engaging with the tip member so as to be movable in the longitudinal direction and rotating the lock member relative to the tip member to retract the lock member, a locking portion of the lock member is placed at the front end of the front shaft. A locking mechanism is provided that can select whether or not the gripping member can be moved in the longitudinal direction with respect to the tip member screwed to the slide member, and the front member is forward of the tip member screwed to the slide member. A sliding member formed with a cam and a rear cam is movable in the longitudinal direction and built in a non-rotatable manner, and a rotating member formed with a front cam and a rear cam is built in the tip member so as to be pivotable, A front cam of the rotating member, a front cam of the sliding member, a rear cam of the rotating member, and a rear cam of the sliding member are configured to come into contact with each other, and a core holder that holds the core is attached to the rotating member. With respect to the tip member screwed to the slide member by By reciprocating the sliding member in the longitudinal direction, the front cam of the rotating member, the front cam of the sliding member, the rear cam of the rotating member, and the rear cam of the sliding member come into contact with each other. Comprises a rotation mechanism that rotates in one direction and rotates the core holder in one direction at a predetermined angle, and operates the lock mechanism so that the slide member is elongated relative to the slide member. When it is possible to move in the direction, by rotating the core with the rotation of the core holder by writing, and when the sliding member is not movable with respect to the slide member, A mechanical pencil characterized in that the core does not rotate even when writing. It has a front shaft and a rear shaft, a fixing member is fixedly attached to the front shaft, a chuck for holding a core is arranged inside the front shaft, and a fastener is externally fitted to the head of the chuck, The chuck is urged rearward in the longitudinal direction by a chuck spring, and a coupling member that receives the fastener pressed by the chuck is configured to be rotatable with respect to a slide member that can be appropriately moved in the longitudinal direction within the front shaft. When the tip member arranged in front of the front shaft is detachably screwed onto the slide member and writing is performed, the forward movement stops in a state where the core is pressed against the paper surface and receiving writing pressure. The gripping member gripped by hand with respect to the slide member moves forward, and when the core is separated from the paper surface, the slide member moves forward with respect to the gripping member gripped by hand. Front cam and rear A sliding member formed with a front cam and a rear cam formed in the tip member is rotatably incorporated, and is movable in the longitudinal direction. A cam, a front cam of the sliding member, a rear cam of the rotating member, and a rear cam of the sliding member are configured to come into contact with each other, and an inner frame having a core guide pipe fixed inside the rotating member is disposed. A core holder for holding a core is attached to the middle piece, the middle piece and the core holder are movable in the longitudinal direction with respect to the rotating member, and cannot be rotated, and are screwed into the slide member by writing. By reciprocating the sliding member in the longitudinal direction with respect to the tip member, the front cam of the rotating member, the front cam of the sliding member, the rear cam of the rotating member, and the rear cam of the sliding member abut against each other. The rotating member rotates in one direction in contact with the rotating member. Constitute a rotation mechanism for rotating at each predetermined angle wick holder in one direction, arranged locking member exposed to the outside to form a large diameter rear inwardly of the front axle, it is formed in the front shaft A front threaded portion of the front shaft is formed by screwing a male thread portion formed on the lock member into a female thread portion so as to be movable in the longitudinal direction and rotating the lock member to move the front shaft forward in the longitudinal direction. A lock mechanism that prevents the sliding member from reciprocating in the longitudinal direction when the protruding portion formed at the rear portion of the sliding member is pushed by a key formed on the inner surface to move the sliding member forward; Provided, when the lock mechanism is operated and the sliding member is movable in the longitudinal direction with respect to the sliding member, the core is rotated along with the rotation of the core holder by writing, In addition, the sliding member is connected to the sliding member. A mechanical pencil characterized in that the core does not rotate even if writing is performed when it is made impossible to move.

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