JP2022073560A - mechanical pencil - Google Patents

Abstract

To provide a mechanical pencil with the rotation drive mechanism that can be freely switched on and off.SOLUTION: A mechanical pencil 1 is configured so that back and forth movement of a chuck unit 20 arranged in a barrel 11 releases and grips a writing core so as to extend the writing core forward. The chuck unit 20 is held in the barrel 11 so as to be rotatable around a central axis while holding the writing core. The mechanical pencil comprises: a rotation drive mechanism 22 which has a rotor 30, and in which the rotor 30 retracts as the chuck unit 20 retracts due to writing pressure received by the writing core, causing the rotor 30 to rotate, and the rotational movement of the rotor 30 is configured to be transmitted to the writing core via the chuck unit 20; and further a rotation lock mechanism that locks the rotation of the rotor 30.SELECTED DRAWING: Figure 2

Description

The present invention relates to mechanical pencils.

A rotating member including a slider equipped with a chuck that allows the writing core to move forward and prevents it from moving backward, and an axial backward movement and release of the writing pressure due to the writing pressure received by the writing core having a rotor and being held by the chuck. It is equipped with a rotation drive mechanism that rotationally drives the rotor in one direction in response to the forward movement in the axial direction by the chuck, and the writing core is rotated by the chuck rotating in response to the rotational driving force of the rotor. A sharp pencil configured as described above is known (Patent Document 1).

International Publication No. 2007/142135

In the mechanical pencil described in Patent Document 1, since the writing core rotates as the writing progresses, uneven wear of the writing core can be prevented. On the other hand, since the writing core is slightly advanced and retracted in order to rotate the writing core by the rotation drive mechanism, the forward and backward movements of the writing core may be troublesome, for example, in the case of shorthand writing. Therefore, it is preferable to allow the user to freely switch between on (operating or enabling) and off (stopping or disabling) the rotary drive mechanism.

An object of the present invention is to provide a mechanical pencil that can freely switch on and off of a rotary drive mechanism.

According to one aspect of the present invention, the writing core is released and gripped by the back-and-forth movement of the chuck unit arranged in the barrel, so that the writing core is extended forward. A mechanical pencil held in the shaft cylinder so as to be rotatable around the central axis while holding the writing core, having a rotor, and the chuck unit due to the writing pressure received by the writing core. The rotor is retracted along with the retracting motion to provide a rotational drive mechanism for rotating the rotor, and the rotational motion of the rotor is transmitted to the writing lead via the chuck unit. A mechanical pencil is provided that further comprises a mechanical pencil that locks the rotation of the rotor.

According to another aspect of the present invention, the rotation lock mechanism may be configured to lock the rotor in a relatively retracted state in the rotation drive mechanism. The rotation lock mechanism may be configured to push the rotor backwards or push the rotation drive mechanism forwards so that the rotor is relatively retracted in the rotation drive mechanism.

The rotor or the rotation drive mechanism may be directly or indirectly pressed by the rotation lock mechanism. The rotary lock mechanism may have a rotary member provided with a cam, and the rotary motion of the rotary member may be converted into a linear motion by the action of the cam, and the rotor may be pressed.

The rotor may be pressed backward through the chuck unit. The rotation lock mechanism may have a retracting mechanism or a rotation feeding mechanism that presses the rotation driving mechanism forward.

The hoisting mechanism or the rotary feeding mechanism may have a spring and a sliding member for urging the spring, and the sliding member may be advanced to push the rotary drive mechanism forward.

When the haunting mechanism further has a knock member and a knock rotor arranged at the rear end of the barrel, and knocks the knock member to advance the knock rotor to a predetermined position, the knock rotor is moved forward. The knock rotor rotates around the central axis, the retreat of the knock rotor is locked, and the rotation drive mechanism is advanced so that the rotor is locked in a state of being relatively retracted in the rotation drive mechanism. You may do so. The rotor may be pressed backward through the spacer.

The writing core may be extended by moving the chuck unit back and forth while the rotation lock mechanism locks the rotor. The rotation drive mechanism has a first cam forming member and a second cam forming member, and the rotor is formed in an annular shape, and a first cam surface and a second cam surface are formed on one end surface and the other end surface in the axial direction thereof. The first fixed cam surface and the second fixed cam surface formed on the first cam forming member and the second cam forming member so as to face the first cam surface and the second cam surface, respectively. The cam surface is arranged, the first cam surface of the rotor is brought into contact with the first fixed cam surface by the retracting operation of the chuck unit due to the writing pressure, and the rotation is caused by the release of the writing pressure. The second cam surface of the child is configured to be in contact with the second fixed cam surface and meshed with the second cam surface, and the first cam surface of the rotor is meshed with the first fixed cam surface. The second cam surface of the rotor and the second fixed cam surface are set so as to be out of phase with respect to one tooth of the cam in the axial direction, and the second cam surface of the rotor is the second cam surface. In a state of being meshed with the fixed cam surface, the first cam surface of the rotor and the first fixed cam surface are set so as to be out of phase with respect to one tooth of the cam in the axial direction, and the rotation drive mechanism. However, the first cam surface of the rotor may be engaged with the first fixed cam surface to lock the rotor.

According to the aspect of the present invention, there is a common effect of providing a mechanical pencil that can freely switch on and off the rotation drive mechanism.

FIG. 1 is a front view of the first mechanical pencil. FIG. 2 is a vertical cross-sectional view of the first mechanical pencil. FIG. 3 is an enlarged cross-sectional view of the rotation drive mechanism. FIG. 4 is a schematic diagram illustrating the rotational drive of the rotor of the rotary drive mechanism. FIG. 5 is a schematic diagram illustrating the rotational drive of the rotor following FIG. FIG. 6 is a vertical cross-sectional view of the rear axis of the first mechanical pencil. FIG. 7 is an exploded perspective view of the changeover switch and the first rotating member. FIG. 8 is a vertical sectional view illustrating the operation of the first rotation lock mechanism. FIG. 9 is a vertical cross-sectional view of the second mechanical pencil. FIG. 10 is a vertical sectional view illustrating the operation of the second rotation lock mechanism. FIG. 11 is a vertical cross-sectional view of the third mechanical pencil. FIG. 12 is a vertical cross-sectional view of the rear end of the rear axle of the third mechanical pencil. FIG. 13 is a perspective view of the knock member of the third mechanical pencil. FIG. 14 is a perspective view of the knock rotor of the third mechanical pencil. FIG. 15 is a schematic diagram illustrating the operation of the third rotation lock mechanism. FIG. 16 is a vertical sectional view illustrating the operation of the third rotation lock mechanism. FIG. 17 is a vertical sectional view illustrating the operation of the fourth rotation lock mechanism. FIG. 18 is a vertical sectional view of the first ballpoint pen in a non-writing state. FIG. 19 is a vertical cross-sectional view of the rear end portion of the rear shaft of the first ballpoint pen. FIG. 20 is a perspective view of the third rotating member of the first ballpoint pen. FIG. 21 is a perspective view of the first sliding member of the first ballpoint pen. FIG. 22 is a perspective view of the first ballpoint pen in a non-writing state. FIG. 23 is a perspective view of the first ballpoint pen in the writing state. FIG. 24 is a cross-sectional view illustrating the operation of the first rotary feeding mechanism. FIG. 25 is a vertical cross-sectional view of the fourth mechanical pencil. FIG. 26 is a vertical cross-sectional view of the rear end of the rear axle of the fourth mechanical pencil. FIG. 27 is a perspective view of the fourth rotating member of the fourth mechanical pencil. FIG. 28 is a perspective view of the second sliding member of the fourth mechanical pencil. FIG. 29 is a cross-sectional view illustrating the operation of the second rotary feeding mechanism. FIG. 30 is a vertical cross-sectional view illustrating the operation of the fifth rotation lock mechanism and the second rotation feeding mechanism. FIG. 31 is a vertical sectional view illustrating the operation of the sixth rotation lock mechanism.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. A common reference code is attached to the corresponding components throughout the drawings.

FIG. 1 is a front view of the first mechanical pencil 1, and FIG. 2 is a vertical sectional view of the first mechanical pencil 1.

The first mechanical pencil 1 has a shaft cylinder 11 formed in a cylindrical shape. The axle cylinder 11 has a front shaft 12, a rear shaft 40 fitted or screwed to the rear end portion of the front shaft 12, and a mouthpiece member 14 fitted or screwed to the front end portion of the front shaft 12. There is. The first mechanical pencil 1 is configured such that the writing core protrudes from the tip pipe 16 provided at the tip of the mouth member 14. In the present specification, in the axial direction of the first mechanical pencil 1, the writing core side is defined as the "front" side, and the side opposite to the writing core side is defined as the "rear" side.

A rectangular through hole 43 extending along the circumferential direction is provided on the front side surface of the rear shaft 40. The switch portion 52 of the changeover switch 50 projects from the through hole 43. A knock cover 15 is attached to the rear end of the rear shaft 40 to cover the eraser 17 as an erasing member. Inside the front end portion of the shaft cylinder 11, a slider 18 is arranged so as to be slidable in the axial direction and rotatable around the central axis. The tip pipe 16 is attached to the slider 18. Inside the slider 18 behind the tip pipe 16, a holding chuck 19 having a through hole formed in the center is arranged. The through hole of the holding chuck 19 slides into contact with the outer peripheral surface of the writing core and acts to temporarily hold the writing core.

A chuck unit 20 for gripping the writing core and a relay member 21 formed in a cylindrical shape are connected to the rear end portion of the slider 18. According to the chuck unit 20, when a writing pressure is applied to the writing core, the writing core is gripped to prevent the writing core from retreating, and when a force for pulling out the writing core works, the writing core is pulled. It can be pulled forward without resistance.

The chuck unit 20 and the relay member 21 can be integrally moved in the axial direction together with the slider 18. The rear end portion of the relay member 21 is connected to the rotation drive mechanism 22. The front end portion of the core case 23 is fitted to the outer peripheral surface of the rear end portion of the chuck unit 20. The core case 23 is formed in a cylindrical shape, and a writing core is housed inside.

Inside the rear end portion of the axle cylinder 11, specifically, the rear end portion of the rear shaft 40, a knock member 24 is provided so as to be movable back and forth with respect to the axle cylinder 11. The knock member 24 is urged rearward by the coil spring 25. An eraser 17 is detachably attached to the inside of the rear end portion of the knock member 24. The above-mentioned knock cover 15 is detachably attached to the outer peripheral surface of the rear end portion of the knock member 24 to protect the eraser 17 from dirt and the like.

The core case 23 moves forward by performing a knock operation that presses the knock member 24 or the knock cover 15 forward. As a result, the writing core also advances via the chuck unit 20 and acts so as to extend the writing core from the tip pipe 16. When the pressure due to the knock operation is released, the knock member 24 retracts and returns to the original position due to the urging force of the coil spring 25. At this time, since the writing core is held by the holding chuck 19 arranged in the slider 18, the writing core is pulled out from the chuck unit 20 without resistance as an action of the chuck unit 20. As a result, since the writing core is fed out from the tip pipe 16, the writing core can be fed out by a predetermined amount each time the knocking operation is repeated.

FIG. 3 is an enlarged cross-sectional view of the rotation drive mechanism 22. The rotation drive mechanism 22 is arranged in the internal space of the rear shaft 40. The rotation drive mechanism 22 is connected to the rear end portion of the relay member 21. A shaft spring 26 is arranged between the rear end surface of the front shaft 12 and the front end surface of the rotation drive mechanism 22, and the rotation drive mechanism 22 is urged rearward. The retreat of the rotation drive mechanism 22 due to the urging force of the shaft spring 26 is restricted by the rear end surface of the rotation drive mechanism 22 coming into contact with the front end surface 42 of the regulation protrusion 41 of the rear shaft 40, which will be described later. The core case 23 penetrates the inside of the relay member 21 and the rotation drive mechanism 22 and is separated from the rotation drive mechanism 22.

The rotation drive mechanism 22 is a rotor 30 formed in a cylindrical shape, an upper cam forming member 31 which is a first cam forming member formed in a cylindrical shape, and a second cam forming member formed in a cylindrical shape. It has a lower cam forming member 32, a cylindrically formed cylinder member 33, a cylindrically formed torque canceller 34, and a coiled cushion spring 35. The rotation drive mechanism 22 is unitized by integrating these members.

As will be described later, a first rotation lock mechanism having a changeover switch 50 and a first rotation member 54 is arranged in front of the rotation drive mechanism 22.

The outer peripheral surface of the rear end portion of the relay member 21 is fitted to the inner peripheral surface of the front end portion of the rotor 30. The vicinity of the front end portion of the rotor 30 has a flange-shaped portion having a slightly larger diameter, a first cam surface 30a is formed on the rear end surface of the portion, and a second cam surface 30a is formed on the front end surface of the portion. The cam surface 30b is formed.

The upper cam forming member 31 rotatably surrounds the rotor 30 behind the first cam surface 30a of the rotor 30. The lower cam forming member 32 is fitted to the outer peripheral surface of the front end portion of the upper cam forming member 31. A first fixed cam surface 31a is formed on the front end surface of the upper cam forming member 31 facing the first cam surface 30a of the rotor 30. A second fixed cam surface 32a is formed on the inner surface of the front end portion of the lower cam forming member 32 facing the second cam surface 30b of the rotor 30.

A cylinder member 33 formed in a cylindrical shape is fitted on the outer peripheral surface of the rear end portion of the upper cam forming member 31. An insertion hole 33a through which the core case 23 can be inserted is formed at the rear end of the cylinder member 33. Inside the cylinder member 33, a torque canceller 34 that is formed in a cylindrical shape and can be moved back and forth is arranged. A cushion spring 35 is arranged between the inner surface of the front end portion of the torque canceller 34 and the inner surface of the rear end portion of the cylinder member 33. The cushion spring 35 urges the rotor 30 forward via the torque canceller 34.

Here, the relay member 21 transmits the backward and forward movements (cushion movements) of the writing core based on the writing movements to the rotation drive mechanism 22, that is, the rotor 30, and the rotor 30 in the rotation drive mechanism 22 generated by the cushion movements. The rotational movement of the above is transmitted to the chuck unit 20 in a state where the writing core is gripped. Therefore, the writing core held by the chuck unit 20 also rotates.

The rotor 30 is positioned forward by the urging force of the cushion spring 35 via the torque canceller 34, except when writing with the first mechanical pencil 1, that is, when writing pressure is not applied to the writing core. .. Therefore, the second cam surface 30b of the rotor 30 comes into contact with the second fixed cam surface 32a and is brought into a meshed state. When writing with the first mechanical pencil 1, that is, when writing pressure is applied to the writing core, the chuck unit 20 retracts against the urging force of the cushion spring 35, and the rotor 30 accompanies this. Also retreats. Therefore, the first cam surface 30a of the rotor 30 comes into contact with the first fixed cam surface 31a and is brought into a meshed state.

FIG. 4 is a schematic diagram illustrating the rotational drive of the rotor 30 of the rotary drive mechanism 22, and FIG. 5 is a schematic diagram illustrating the rotational drive of the rotor 30 following FIG. In FIGS. 4 and 5, a first cam surface 30a continuously serrated along the circumferential direction is formed in an annular shape on the rear end surface, which is the upper surface of the rotor 30, and the rotor 30 is formed. On the front end surface, which is the lower surface, a second cam surface 30b, which is also continuously sawtoothed along the circumferential direction, is formed in an annular shape.

The annular end surface of the upper cam forming member 31 facing the first cam surface 30a of the rotor 30 is also formed with a first fixed cam surface 31a continuously serrated along the circumferential direction, and the rotor 30 is formed. A second fixed cam surface 32a continuously serrated along the circumferential direction is also formed on the annular end surface of the lower cam forming member 32 facing the second cam surface 30b. The cam surfaces of the first cam surface 30a and the second cam surface 30b formed on the rotor 30, and the first fixed cam surface 31a and the lower cam forming member 32 formed on the upper cam forming member 31. 2 Each cam surface of the fixed cam surface 32a is formed so that the pitches are substantially the same as each other.

FIG. 4A shows the relationship between the rotor 30, the upper cam forming member 31, and the lower cam forming member 32 in a state where the writing pressure is not applied to the writing core. In this state, the second cam surface 30b formed on the rotor 30 is in contact with the second fixed cam surface 32a of the lower cam forming member 32 by the urging force of the cushion spring 35. At this time, the first cam surface 30a of the rotor 30 and the first fixed cam surface 31a of the upper cam forming member 31 are offset by a half phase (half pitch) with respect to one tooth of the cam in the axial direction. Is set to.

FIG. 4B shows an initial state in which writing pressure is applied to the writing core for writing with the first mechanical pencil 1. In this state, the rotor 30 retracts the cushion spring 35 as the chuck unit 20 retracts. As a result, the rotor 30 moves toward the first fixed cam surface 31a of the upper cam forming member 31.

Next, FIG. 4C shows a state in which the writing pressure is further applied to the writing core and the rotor 30 abuts on the first fixed cam surface 31a of the upper cam forming member 31 and retracts. In this state, the first cam surface 30a of the rotor 30 meshes with the first fixed cam surface 31a of the upper cam forming member 31. As a result, the rotor 30 receives a rotational drive corresponding to a half phase (half pitch) of one tooth of the first cam surface 30a.

The circles drawn at the center of the rotor 30 in FIGS. 4 and 5 indicate the amount of rotational movement of the rotor 30. Then, in the state shown in FIG. 4C, the second cam surface 30b of the rotor 30 and the second fixed cam surface 32a of the lower cam forming member 32 are half with respect to one tooth of the cam in the axial direction. It is set so that the relationship is out of phase (half pitch).

Next, FIG. 5D shows an initial state in which writing by the first mechanical pencil 1 is completed and the writing pressure on the writing core is released. In this case, the rotor 30 is advanced by the urging force of the cushion spring 35. As a result, the rotor 30 moves to the lower cam forming member 32 side.

Next, FIG. 5 (E) shows a state in which the rotor 30 abuts on the first fixed cam surface 31a of the upper cam forming member 31 by the urging force of the cushion spring 35 and advances. In this case, the second cam surface 30b of the rotor 30 meshes with the second fixed cam surface 32a of the lower cam forming member 32. As a result, the rotor 30 is again subjected to the rotational drive corresponding to the half phase (half pitch) of one tooth of the second cam surface 30b.

Therefore, as shown by a circle drawn in the center of the rotor 30, the rotor 30 is moved by the reciprocating movement in the axial direction of the rotor 30 under the writing pressure, that is, by the back-and-forth movement. A rotation drive corresponding to one tooth (1 pitch) of the second cam surface 30a and the second cam surface 30b is received, and the writing core gripped by the chuck unit 20 is also rotationally driven via the chuck unit 20. Therefore, the rotor 30 receives a rotational movement corresponding to one tooth of the cam by one forward / backward movement of the rotor 30 in the axial direction by writing, and by repeating this, the writing core is sequentially rotationally driven. Therefore, it is possible to prevent the writing core from being unevenly worn as the writing progresses, and it is possible to prevent the thickness of the drawn line and the density of the drawn line from being significantly changed.

The torque canceller 34, which receives the urging force of the cushion spring 35 and pushes the rotor 30 forward, causes slippage between the front end surface thereof and the rear end surface of the rotor 30, and the rotational movement of the rotor 30 is caused. It prevents transmission to the cushion spring 35. That is, the torque canceller 34 prevents the rotational movement of the rotor 30 from being transmitted to the cushion spring 35, thereby causing untwisting (torque) of the cushion spring 35 that hinders the rotational operation of the rotor 30. It is preventing that.

From the above, the first sharp pencil 1 has a chuck unit 20 and a rotor 30, and the writing core can be extended forward by releasing and gripping the writing core by moving the chuck unit 20 back and forth. The chuck unit 20 is held in the shaft cylinder 11 so as to be rotatable around the central axis while holding the writing core, and rotates as the chuck unit 20 retracts due to the writing pressure received by the writing core. A rotation drive mechanism 22 for retracting the child 30 to rotate the rotor 30 is provided, and the rotational movement of the rotor 30 is transmitted to the writing core via the chuck unit 20.

Here, the principle of the rotation lock mechanism that allows the user to freely switch on (operate or enable) and off (stop or disable) the rotation drive mechanism will be described.

The rotor 30 is urged forward by the urging force of the cushion spring 35 via the torque canceller 34. Therefore, when writing pressure is not applied to the writing core, the second cam surface 30b of the rotor 30 meshes with the second fixed cam surface 32a of the lower cam forming member 32, as shown in FIG. 4 (A). There is. As shown in FIG. 4C, the rotation lock mechanism uses the first cam surface 30a of the rotor 30 as the first fixed cam surface 31a of the upper cam forming member 31 in a state where the writing pressure is not applied to the writing core. It is configured to mesh with. As a result, even if the writing pressure is applied to the writing core, the rotor 30 retracts and does not rotate. Therefore, the rotation lock mechanism locks the rotation of the rotor 30.

Hereinafter, a specific configuration of the rotation lock mechanism will be described.

FIG. 6 is a vertical cross-sectional view of the rear axle 40 of the first mechanical pencil 1. In FIG. 6, the upper side is the rear side of the first mechanical pencil 1. The above-mentioned through hole 43 is provided on the front side surface of the rear shaft 40. The inner peripheral surface of the rear shaft 40 is provided with an inclined cam receiving surface 44 that extends diagonally along the circumferential direction around the central axis and faces forward. Behind the inclined cam receiving surface 44, a plurality of regulating protrusions 41 extending along the axial direction are provided at equal intervals along the circumferential direction. The front end surface 42 of the regulation protrusion 41 regulates the retreat of the rotation drive mechanism 22.

FIG. 7 is an exploded perspective view of the changeover switch 50 and the first rotating member 54. The changeover switch 50 has a C-shaped switch support portion 51 and a switch portion 52. The switch portion 52 is provided so as to project outward on the outer surface of one end of the curved switch support portion 51.

The first rotating member 54 has a cylindrical cam body 55 having a C-shaped cross-sectional shape, and a support plate 57 that partially closes the opening 56 in front of the cam body 55. Since the cam body 55 has a C-shaped cross-sectional shape, a gap 58 extending in the axial direction is defined on the side surface of the cam body 55. An inclined cam surface 59 is provided on the rear end surface of the cam body 55. The inclined cam surface 59 is formed so as to correspond to the inclined cam receiving surface 44 of the rear shaft 40.

In the axle cylinder 11, the changeover switch 50 is inserted into the opening 56 in front of the first rotating member 54 and is arranged so as to abut on the support plate 57. At this time, the switch portion 52 of the changeover switch 50 is inserted into the gap 58 of the first rotating member 54. The width of the switch portion 52 is slightly smaller than the width of the gap 58. As shown in FIG. 1, the switch portion 52 projects outward through the through hole 43 of the rear shaft 40. In FIG. 1, the switch portion 52 is located on the left side in the through hole 43, but as described below, the switch portion 52 can be slid so as to be located on the right side in the through hole 43.

FIG. 8 is a vertical sectional view illustrating the operation of the first rotation lock mechanism. The state shown in FIG. 8A is a rotation lock release state in which the rotation drive mechanism 22 is on, and the state shown in FIG. 8B is a rotation lock state in which the rotation drive mechanism 22 is off. .. Therefore, the rotation drive mechanism 22 shown in FIG. 8 (A) corresponds to the state of the rotor 30 shown in FIG. 4 (A). The state shown in FIG. 8A corresponds to the state of the switch unit 52 shown in FIG. On the other hand, since the rotation drive mechanism 22 shown in FIG. 8B corresponds to the state of the rotor 30 shown in FIG. 4C, the first cam surface 30a of the rotor 30 and the upper cam are formed. It meshes with the first fixed cam surface 31a of the member 31.

The switch portion 52 is not shown in the vertical sectional view of FIG. 8A. In the vertical cross-sectional view of FIG. 8A, the inclined cam surface 59 of the first rotating member 54 shown below is in contact with the inclined cam receiving surface 44 of the rear shaft 40, but the first shown above. The inclined cam surface 59 of the rotating member 54 does not abut on the inclined cam receiving surface 44 of the rear shaft 40. On the other hand, in the vertical cross-sectional view of FIG. 8B, all the inclined cam surfaces 59 of the first rotating member 54 are in contact with the inclined cam receiving surface 44 of the rear shaft 40. That is, the changeover switch 50 and the first rotating member 54 shown in FIG. 8A are arranged behind the changeover switch 50 and the first rotating member 54 shown in FIG. 8B in the barrel 11. ing.

By operating the changeover switch 50 from the state shown in FIG. 8A, specifically, in FIG. 1, the switch portion 52 is slid with a finger along the circumferential direction from the left in the through hole 43. By moving it to the right, the first rotating member 54 is rotated around the central axis together with the changeover switch 50. Here, the changeover switch 50 and the first rotating member 54 are always urged rearward by the shaft spring 26. Therefore, the inclined cam surface 59 of the first rotating member 54 slides while abutting along the inclined cam receiving surface 44 of the rear shaft 40, and the changeover switch 50 and the first rotating member 54 retract by the distance D according to the slide. do. As a result, the rear end surface of the first rotating member 54, specifically the support plate 57, presses the front end surface of the rotor 30 and retracts the rotor 30. When the rotor 30 retracts, the state of the rotor 30 shown in FIG. 4C is set, and the rotation of the rotor 30 is locked.

On the other hand, by operating the changeover switch 50 from the state shown in FIG. 8B, specifically, in FIG. 1, the switch portion 52 is slid with a finger along the circumferential direction in the through hole 43. By moving from right to left, the first rotating member 54 is rotated in the opposite direction around the central axis together with the changeover switch 50. As a result, the inclined cam surface 59 of the first rotating member 54 slides in the opposite direction while abutting along the inclined cam receiving surface 44 of the rear shaft 40. In response to the slide, the changeover switch 50 and the first rotating member 54 advance by a distance D against the urging force of the shaft spring 26, and are in the state shown in FIG. 8 (A). As the changeover switch 50 and the first rotating member 54 advance, the rotor 30 advances by the urging force of the cushion spring 35. When the rotor 30 moves forward, the state of the rotor 30 shown in FIG. 4A is reached, and the rotation of the rotor 30 is unlocked. The through hole 43 of the rear shaft 40 is formed slightly larger than the shape of the switch portion 52 so as not to hinder the advancement or retreat of the switch portion 52 of the changeover switch 50.

In the first rotation lock mechanism, the changeover switch 50 and the first rotation member 54 convert the rotary motion into a linear motion in response to the operation of the changeover switch 50, and press or press the rotor 30 by the first rotary member 54. It can be configured arbitrarily as long as it can be released. For example, the changeover switch 50 and the first rotating member 54 may be integrally configured. Further, the shapes of the inclined cam receiving surface 44 of the rear shaft 40 and the inclined cam surface 59 of the first rotating member 54 can be arbitrarily configured as long as they cooperate with each other.

In the first rotation lock mechanism, the changeover switch 50 is slid along the circumferential direction so that the first rotation member 54 rotates, but by sliding the changeover switch along the axial direction, the changeover switch 50 rotates more directly. The child 30 may be moved forward or backward. In this case, the changeover switch may be selectively switched between the forward position for pressing the rotor 30 and the backward position for releasing the press of the rotor 30 in the barrel 11.

The other rotation lock mechanism described below does not have the changeover switch 50 and the first rotation member 54. Therefore, the shaft spring 26 directly urges the rotation drive mechanism 22 to the rear.

9 is a vertical cross-sectional view of the second mechanical pencil 2, and FIG. 10 is a vertical cross-sectional view illustrating the operation of the second rotation lock mechanism. The second mechanical pencil 2 has a second rotation lock mechanism instead of the first rotation lock mechanism as compared with the first mechanical pencil 1. Therefore, the inclined cam receiving surface 44 and the like are not provided on the inner surface of the rear shaft 13. The second rotation lock mechanism has a second rotation member 60 and an annular elastic member 65.

The second rotating member 60 is fitted to the outer peripheral surface of the mouth member 14. A spiral cam groove 61 is provided on the inner peripheral surface of the second rotating member 60. On the other hand, a corresponding spiral cam protrusion 14a is provided on the outer peripheral surface of the mouth member 14. In short, the cam groove 61 of the second rotating member 60 corresponds to a female screw, and the cam protrusion 14a of the mouth member 14 corresponds to a male screw. Therefore, when the second rotating member 60 is rotated around the central axis with respect to the mouth member 14, the second rotating member 60 moves forward or backward according to the rotation direction. An annular recess 18a is provided on the outer peripheral surface of the slider 18. An annular elastic member 65 is fitted in the annular recess 18a. The annular elastic member 65 is, for example, an O-ring.

The state shown in FIG. 10A is a rotation lock release state in which the rotation drive mechanism 22 is on, and the state shown in FIG. 10B is a rotation lock state in which the rotation drive mechanism 22 is off. .. In the state shown in FIG. 10A, the second rotating member 60 is located forward and does not interfere with the annular elastic member 65.

When the second rotating member 60 is rotated from this state, the cam groove 61 and the cam protrusion 14a cooperate with each other, and the second rotating member 60 retracts. As the second rotating member 60 retracts, the annular elastic member 65 is pressed by the slope 62 formed on the inner surface of the second rotating member 60 and retracts, resulting in the state shown in FIG. 10B. Specifically, due to the retreat of the second rotating member 60, the slider 18, the chuck unit 20 and the relay member 21 are retracted by the distance D together with the annular elastic member 65. Since the rotor 30 is fitted to the rear end of the relay member 21, the rotor 30 retracts to the state of the rotor 30 shown in FIG. 4C, and the rotor 30 is in the state of the rotor 30. Rotation is locked.

On the other hand, when the second rotating member 60 is rotated in the opposite direction, the cam groove 61 and the cam protrusion 14a cooperate with each other, and the second rotating member 60 moves forward. As the second rotating member 60 advances, the pressing of the annular elastic member 65 by the slope 62 of the second rotating member 60 is released, and the state shown in FIG. 10A is obtained. As a result, when the rotor 30 moves forward, the state of the rotor 30 shown in FIG. 4A is reached, and the rotation of the rotor 30 is unlocked.

In the second rotary lock mechanism, the second rotary member 60 and the annular elastic member 65 are arbitrarily configured as long as the rotary motion is converted into a linear motion and the rotor 30 is pressed or released via the relay member 21. Can be. For example, the annular elastic member 65 and the slider 18 may be integrally configured. Further, in the second rotation lock mechanism, the second rotation member 60 is rotated and operated, but by sliding the fitting member fitted to the mouth member 14 along the axial direction, the annular elasticity is more directly applied. The member 65 and thus the rotor 30 may be moved forward or backward. In this case, the fitting member may be selectively switched between a forward position for pressing the rotor 30 and a retracted position for releasing the pressing of the rotor 30 on the outer surface of the mouth member 14.

FIG. 11 is a vertical sectional view of the third mechanical pencil 3. The third mechanical pencil 3 has a third rotation lock mechanism instead of the first rotation lock mechanism as compared with the first mechanical pencil 1. The third rotation lock mechanism includes a knock member 80, a knock rotor 90, and an urging spring 99, and utilizes a knock-type writing tool's appearance mechanism or knock mechanism. Therefore, a third rotation lock mechanism may be configured by applying a haunting mechanism other than the haunting mechanism described later.

FIG. 12 is a vertical cross-sectional view of the rear end portion of the rear shaft 70 of the third mechanical pencil 3. In FIG. 12, the upper side is the front side of the third mechanical pencil 3. The inner peripheral surface of the rear shaft 70 has four first protrusions 71 and four second protrusions 72 that extend in the axial direction and are connected to each other at the rear end. The first protrusions 71 and the second protrusions 72 are arranged at equal intervals and alternately along the circumferential direction.

On the upper surface of each of the first protrusions 71, that is, the surface of the rear shaft 70 facing the central axis, a cam surface 73 inclined in the circumferential direction with respect to a plane perpendicular to the front-rear direction and facing forward is provided. Has been done. Therefore, in the first protrusion 71, the rear side of the cam surface 73 is a thicker, that is, a higher protrusion. On the other hand, in the first protrusion 71, the front of the cam surface 73 is thinner, that is, a lower protrusion, and is a protrusion having the same height as the second protrusion 72. The front end surface 74 of the first protrusion 71 and the second protrusion 72 regulates the retreat of the rotation drive mechanism 22. Each of the first protrusion 71 and the second protrusion 72 has a vertical wall surface 75 which is a regulation surface extending in the front-rear direction. A contact surface 76 is formed on the front end surface of the portion connecting each of the first protrusion 71 and the second protrusion 72. The cam surface 73 and the vertical wall surface 75 form the outer cam 77.

FIG. 13 is a perspective view of the knock member 80 of the third mechanical pencil 3. In FIG. 13, the upper side is the front side of the third mechanical pencil 3. The knock member 80 is a tubular member with both ends open. Two protrusions 81 are provided at symmetrical positions on the outer peripheral surface on the front side of the knock member 80. Further, a slit portion 82 extending rearward from the front end surface of the knock member 24 is provided between the two protrusions 81. Each of the protrusions 81 is configured to move back and forth between the first protrusions 71 by a knock operation. That is, the diameter of the circumscribed circle including the outer surfaces of the two protrusions 81 is larger than the diameter of the inscribed circle in contact with the upper surface of the first protrusion 71 of the rear shaft 70, and the diameter of the second protrusion 72 of the rear shaft 70 is larger. It is set smaller than the diameter of the inscribed circle in contact with the upper surface of. A cam surface 83 is formed on the front end surface of the knock member 80. The cam surface 83 has symmetrically formed peaks 84 and valleys 85. The eight peaks 84 and valleys 85 are connected by a slope 86.

FIG. 14 is a perspective view of the knock rotor 90 of the third mechanical pencil 3. In FIG. 14, the upper side is the front side of the third mechanical pencil 3. The knock rotor 90 is a tubular member with both ends open. The knock rotor 90 has a large diameter portion 90a and a small diameter portion 90b formed behind the large diameter portion 90a and inserted into the knock member 80 to be used for alignment. The large diameter portion 90a has a larger diameter than the small diameter portion 90b. On the outer peripheral surface of the large diameter portion 90a, four vertical grooves 91 are formed which are arranged at equal intervals along the circumferential direction and extend along the front-rear direction. The depth of the vertical groove 91 is shallower than the difference in radius between the large diameter portion 90a and the small diameter portion 90b. The large diameter portion 90a is formed with an inner cam 92 composed of four protrusions 92a defined by the four vertical grooves 91. On the rear end surface of the large diameter portion 90a, a cam receiving surface 93 that is complementary to and cooperates with the cam surface 83 of the knock member 80 is formed on the inner side in the radial direction from the inner cam 92 over the entire circumference. ing. That is, the inner cam 92 and the cam receiving surface 93 are integrally provided on the large diameter portion 90a.

The cam receiving surface 93 is formed in a saw blade shape, and has a slope 94 inclined in the circumferential direction with respect to a plane perpendicular to the front-rear direction. Every other slope 94a in the eight slopes 94 is cut out by the vertical groove 91 described above. The adjacent slope 94 between the adjacent flutes 91 is connected by a vertical wall surface 95 extending in the front-rear direction. That is, the cam receiving surface 93 has four vertical wall surfaces 95. Since the cam surface 83 of the knock member 80 and the cam receiving surface 93 of the knock rotor 90 are formed in a complementary manner, the acute angle defined by the portion of the vertical groove 91 and the slope 94 and the vertical wall surface 95. A slope 94b inclined in the direction opposite to the slope 94 is provided in the portion. The slope 94b is provided at a height sufficient to cooperate with the cam surface 83 of the knock member 80, that is, a radial length.

In short, a cam receiving surface 93 that cooperates with the cam surface 83 of the knock member 80 is provided on the radial inside of the large diameter portion 90a, and the outer cam 77 of the rear shaft 70 is provided on the radial outside of the large diameter portion 90a. An inner cam 92 that cooperates with is provided. The knock rotor 90 is provided with a through hole 96 along the central axis, and the core case 23 is inserted into the through hole 96.

When the knock rotor 90 rotates around the central axis by the knock operation, the inner cam 92 engages with or disengages from the outer cam 77. That is, when the knock rotor 90 rotates around the central axis by the knock operation, the protrusion 92a of the inner cam 92 engages with the first protrusion 71 of the outer cam 77 or between the first protrusions 71 of the outer cam 77. Placed in. When the protrusion 92a of the inner cam 92 is arranged between the first protrusions 71 of the outer cam 77, the first protrusion 71 of the outer cam 77 is arranged between the protrusions 92a of the inner cam 92, that is, in the vertical groove 91. Will be done.

The cam surface 83 of the knock member 80 and the cam receiving surface 93 of the knock rotor 90 have a mountain portion 84 of the cam surface 83 of the knock member 80 when the inner cam 92 engages with or disengages the outer cam 77. It is configured to be located on the slope 94 of the cam receiving surface 93 of the inner cam 92 in the circumferential direction. That is, the slope 86 of the cam surface 83 and the slope 94 of the cam receiving surface 93 are arranged in phase with each other. Therefore, when the slope 86 of the cam surface 83 presses the slope 94 of the cam receiving surface 93 by the knock operation, the knock rotor 90 exerts a component force in the circumferential direction due to this operating load and the urging force of the urging spring 99. It receives and rotates around the central axis. On the other hand, the knock member 80 is restricted from rotating around the central axis by the protrusion 81 abutting on the vertical wall surface 95 of the outer cam 77 in the circumferential direction. Such an operation will be described with reference to FIG.

FIG. 15 is a schematic diagram illustrating the operation of the third rotation lock mechanism, that is, the operation of the haunting mechanism, and is a schematic diagram showing the relationship between the cams of the third mechanical pencil 3. That is, FIG. 15 is a schematic view showing the positional relationship between the outer cam 77 of the rear shaft 70, the knock member 80, and the knock rotor 90. More specifically, the positions of the cam surface 83 of the knock member 80 and the cam receiving surface 93 of the knock rotor 90 are shown with respect to the outer cam 77 expanded in the circumferential direction. In the figure, the upper side is the front side of the third mechanical pencil 3, and the lower side is the rear side of the third mechanical pencil 3. Further, FIG. 16 is a vertical sectional view illustrating the operation of the third rotation lock mechanism.

The operation of the third rotation lock mechanism is performed by performing a knock operation of pressing the knock member 80 or the knock cover 15 forward, similar to the appearance mechanism of the knock type writing tool. Then, the rotation drive mechanism is turned off in the state shown in FIG. 16B, which is the writing state in the knock-type writing tool, that is, the rotation lock state in which the knock rotor 90 is located forward. On the other hand, the rotation drive mechanism is turned on in the non-writing state in the knock-type writing tool, that is, the rotation lock release state shown in FIG. 16A, in which the knock rotor 90 is located rearward. The knock rotor 90 is given a rotational force by a cam mechanism of the cam surface 83 of the knock member 80 and the cam receiving surface 93 of the knock rotor 90, and moves from left to right in the figure for each knock operation.

The state shown in FIG. 15 (A) is the same as that in FIG. 16 (A). In the state shown in FIG. 15A, the inner cam 92 is not engaged with the outer cam 77. That is, the protrusion 92a of the inner cam 92 is arranged between the first protrusions 71 of the outer cam 77, and the first protrusion 71 of the outer cam 77 is arranged between the protrusions 92a of the inner cam 92, that is, in the vertical groove 91. Has been done. The cam surface 83 and the cam receiving surface 93 are arranged out of phase with each other.

From this state, when the knock member 80 is pressed against the urging force of the urging spring 99 and the knock member 80 and the knock rotor 90 are advanced, as shown in FIG. 15B, the inner cam 92 The rear end portion of the vertical groove 91 of the cam receiving surface 93 exceeds the front end portion of the first protrusion 71 of the outer cam 77 in the front-rear direction. At this time, the slope 94 of the cam receiving surface 93 of the knock rotor 90 and the cam surface 73 of the outer cam 77 coincide with each other, and the central axis of the knock rotor 90 is formed by the vertical wall surface 95 of the first protrusion 71 of the outer cam 77. The regulation of rotation around is lifted.

When the pressing of the knock member 80 is released from the state shown in FIG. 15B, the knock member 80 and the knock rotor 90 are retracted by the urging force of the urging spring 99. At this time, the rotation of the knock rotor 90 around the central axis is not regulated by the vertical wall surface 75 of the first protrusion 71 of the outer cam 77. Therefore, when the slope 94 of the cam receiving surface 93 of the knock rotor 90 presses the cam surface 73 of the outer cam 77 or the slope 86 of the cam surface 83 of the knock member 80 by the urging force of the urging spring 99, the knock rotor 90 Rotates around the central axis by receiving a component force in the circumferential direction.

The retreat and rotation of the knock rotor 90 is regulated by the inner cam 92 engaging the outer cam 77. That is, by engaging the slope 94 and the vertical wall surface 95 of the cam receiving surface 93 of the inner cam 92 with the cam surface 73 and the vertical wall surface 95 of the first protrusion 71 of the outer cam 77, the knock rotor 90 is retracted and the vertical wall surface 95 is retracted. The rotation is restricted and the state shown in FIG. 15 (C) is obtained.

The state shown in FIG. 15 (C) is the same as that in FIG. 16 (B). From this state, when the knock member 80 is pressed against the urging force of the urging spring 99 and the knock member 80 and the knock rotor 90 are advanced, as shown in FIG. 15 (D), the inner cam 92 The rear end portion of the vertical wall surface 95 of the cam receiving surface 93 exceeds the front end portion of the first protrusion 71 of the outer cam 77 in the front-rear direction. At this time, the slope 94 of the cam receiving surface 93 of the knock rotor 90 and the cam surface 73 of the outer cam 77 coincide with each other, and the central axis of the knock rotor 90 is formed by the vertical wall surface 95 of the first protrusion 71 of the outer cam 77. The regulation of rotation around is lifted.

When the pressing of the knock member 80 is released from the state shown in FIG. 15 (D), the knock member 80 and the knock rotor 90 are retracted by the urging force of the urging spring 99. At this time, the rotation of the knock rotor 90 around the central axis is not regulated by the vertical wall surface 95 of the first protrusion 71 of the outer cam 77. Therefore, when the slope 94 of the cam receiving surface 93 of the knock rotor 90 presses the cam surface 73 of the outer cam 77 or the slope 86 of the cam surface 83 of the knock member 80 by the urging force of the urging spring 99, the knock rotor 90 Rotates around the central axis by receiving a component force in the circumferential direction.

Since the knock rotor 90 retracts while rotating, the protrusion 92a of the inner cam 92 is arranged between the first protrusions 71 of the outer cam 77, and the second of the outer cam 77 is arranged as shown in FIG. 15 (E). 1 The protrusion 71 is arranged between the protrusions 92a of the inner cam 92, that is, in the vertical groove 91. As a result, the engagement between the outer cam 77 and the inner cam 92 is released. The rotation of the knock member 80 around the central axis is always restricted by the protrusion 81 abutting on the vertical wall surface 95 of the outer cam 77 in the circumferential direction. From the state shown in FIG. 15 (E), the knock member 80 and the knock rotor 90 retreat as they are, and the state shown in FIG. 15 (A) is restored.

In the rotation-locked state shown in FIG. 16B, the urging spring 99 is further compressed by the knock rotor 90 advancing. One end of the urging spring 99 is in contact with the knock rotor 90, and the other end of the urging spring 99 is in contact with the rear end surface of the rotary drive mechanism 22. Therefore, the rotary drive mechanism 22 is compared with the state shown in FIG. 16A by the balance between the forward urging force increased by the compression of the urging spring 99 and the rearward urging force of the shaft spring 26. Then, it is moving forward by the distance D.

When the rotation drive mechanism 22 advances, the minute clearance existing between each member in the barrel 11, for example, the clearance existing between the mouth member 14, the chuck unit 20, the relay member 21, and the like disappears. As a result, the rotor 30 is in a relatively retracted state in the rotation drive mechanism 22, and is in the state of the rotor 30 shown in FIG. 4C, so that the rotation of the rotor 30 is locked.

In the third mechanical pencil 3, the user can perform two knock operations, a rotary lock knock operation for turning on or off the rotary drive mechanism 22 and a feeding knock operation for feeding out the writing core. That is, when it is desired to turn the rotation drive mechanism 22 on or off, as described with reference to FIG. 15, the knock member 80 and eventually the knock rotor 90 until the inner cam 92 exceeds the outer cam 77 in the front-rear direction. To move forward. On the other hand, in the knock operation for feeding out the writing core, the knock member 80 and eventually the chuck unit 20 are advanced to the extent that the chuck unit 20 operates. That is, the rotary lock knock operation needs to be knocked deeper than the feed knock operation. The writing core is also extended in the rotary lock knock operation.

FIG. 17 is a vertical sectional view illustrating the operation of the fourth rotation lock mechanism. The fourth rotation lock mechanism has a spacer 100 in addition to the configuration of the third rotation lock mechanism. The spacer 100 is arranged in front of the rotor 30. Specifically, it is arranged so as to fit on the outer peripheral surface of the relay member 21 at the rear end portion of the front shaft 12. When the knock rotor 90 and thus the rotation drive mechanism 22 advance by the knock operation, the front end surface of the rotor 30 comes into contact with the rear end surface of the spacer 100, and the advance of the rotor 30 is restricted. As a result, the state of the rotor 30 shown in FIG. 4C is obtained, and the rotation of the rotor 30 is locked.

Since the fourth rotation lock mechanism has the spacer 100 in addition to the third rotation lock mechanism, the spacer 100 directly presses the rotor 30, so that the rotation of the rotor 30 is locked more reliably. can do.

By the way, a writing tool having a rotary feeding mechanism in which a refill appears and disappears by rotating a part of a shaft tube, that is, a front shaft or a rear shaft around a central axis, is generally known. Next, a rotation lock mechanism using a new rotation feeding mechanism will be described. Before that, first, the configuration will be described using a ballpoint pen equipped with this new rotary feeding mechanism.

FIG. 18 is a vertical sectional view of the first ballpoint pen 5 in a non-writing state. The first ballpoint pen 5 has a shaft cylinder 11 formed in a cylindrical shape. The axle cylinder 11 includes a front shaft 12, a rear shaft 110 fitted or screwed to the rear end portion of the front shaft 12, and a third rotating member formed in a tubular shape provided at the rear end portion of the rear shaft 110. It has 120 and. Further, the first ballpoint pen 5 includes a refill 7, a coil spring 8, a spring support member 9, and a first sliding member 130, which are cursives arranged in a barrel 11 and having a writing portion 6 at one end. have.

In the axial direction of the first ballpoint pen 5, the writing portion 6 side is defined as the "front" side, and the side opposite to the writing portion 6 is defined as the "rear" side. In the first ballpoint pen 5, the refill 7 moves back and forth in the barrel 11 by operating the first rotation feeding mechanism. At this time, the state in which the writing unit 6 protrudes from the barrel 11 is referred to as a writing state (FIG. 23), and the state in which the writing portion 6 is immersed in the barrel 11 is referred to as a non-writing state (FIGS. 18 and 22).

FIG. 19 is a vertical cross-sectional view of the rear end portion of the rear shaft 110 of the first ballpoint pen 5. In FIG. 19, the upper side is the rear side of the first ballpoint pen 5. An annular protrusion 111 is provided on the inner peripheral surface of the rear portion of the rear shaft 110 along the circumferential direction. As shown in FIG. 24, which will be described later, the annular protrusion 111 is not provided over the entire circumference. For example, on the inner peripheral surface of the rear shaft 110, a recess 112 is defined in place of the annular protrusion 111 on a part along the circumferential direction, for example, a quarter of the entire circumference. The recess 112 is provided with two small protrusions 113, respectively, slightly spaced from both ends of the annular protrusion 111. As a result, two locking recesses 114 are defined between the annular protrusion 111 and the small protrusion 113. A key protrusion 115 is provided at the center of the annular protrusion 111 in the circumferential direction, and a similar key protrusion 115 is provided at the center of the recess 112 in the opposite circumferential direction. The two key protrusions 115 are provided adjacent to the annular protrusion 111 in the axial direction.

FIG. 20 is a perspective view of the third rotating member 120 of the first ballpoint pen 5. In FIG. 20, the upper side is the rear side of the first ballpoint pen 5. The third rotating member 120 is rotatably attached to the rear shaft 110 around the central axis. The third rotating member 120 has a cylindrical grip portion 121 that is gripped by the user when it is rotated. A clip 121a is provided on the outer peripheral surface of the grip portion 121. In front of the grip portion 121, an insertion portion 122 which is formed to have a smaller diameter and is inserted into the rear shaft 110 is provided. The insertion portion 122 is provided with two notched portions 123 that are substantially rectangular and face each other from the front end surface toward the rear. Two notches 123 define two cam arms 124 extending forward. The front end surfaces of the two cam arms 124 are provided with cam surfaces 125 inclined in the same direction along the circumferential direction. A rectangular protrusion 126 extending forward is defined in the central portion of the front end surface of the insertion portion 122 in one notch portion. A locking protrusion 127 is provided on the outer surface of the rectangular protrusion 126. On the outer surface of each of the two cam arms 124, a sliding groove 128 is provided along the circumferential direction at the same position as the locking protrusion 127 in the axial direction.

FIG. 21 is a perspective view of the first sliding member 130 of the first ballpoint pen 5. In FIG. 21, the upper side is the rear side of the first ballpoint pen 5. The first sliding member 130 has a sliding main body portion 131. The sliding main body 131 is a tubular member whose rear end is closed. Two cam protrusions 132 are provided on the outer peripheral surface of the sliding main body 131. The two cam protrusions 132 are separated from each other by two key grooves 133 extending along the axial direction. The rear end surfaces of the two cam protrusions 132 are provided with a similarly inclined cam receiving surface 134 corresponding to the cam surface 125 of the third rotating member 120. In each of the cam receiving surfaces 134, the portion located at the front is defined as the start end portion 134a, and the portion located at the rearmost is defined as the end portion 134b.

In the axle cylinder 11, the third rotating member 120 is inserted into the inside from the rear of the rear shaft 110. At this time, the two cam arms 124 bend inward in the radial direction, and the annular protrusion 111 of the rear shaft 110 is arranged in the sliding groove 128. When the third rotating member 120 is rotated around the central axis with respect to the rear shaft 110, the sliding groove 128 acts as a rail, and the annular protrusion 111 can be relatively moved in the sliding groove 128. .. Further, by arranging the annular protrusion 111 of the rear shaft 110 in the sliding groove 128 of the third rotating member 120, the third rotating member 120 is less likely to come off from the rear shaft 110. The locking protrusion 127 of the third rotating member 120 is arranged in the recess 112.

The first sliding member 130 is inserted into the inside from the front of the rear shaft 110, and the rear end portion of the sliding main body 131 is inserted into the inside from the front of the third rotating member 120. When the first sliding member 130 is inserted, the cam arm 124 of the third rotating member 120 is placed so that the key protrusion 115 of the rear shaft 110 is arranged in the key groove 133 of the first sliding member 130. 1 Guided by the cam receiving surface 134 of the sliding member 130. By arranging the key protrusion 115 in the key groove 133, the first sliding member 130 can be moved back and forth in the shaft cylinder 11 without rotating around the central axis. By inserting the sliding main body 131 of the first sliding member 130 into the inside of the third rotating member 120, the two cam arms 124 cannot be bent inward in the radial direction. As a result, it is possible to prevent the third rotating member 120 from falling off from the rear shaft 110.

The first sliding member 130 is urged rearward by the coil spring 8. One end of the coil spring 8 abuts on the front end surface of the cam protrusion 132 of the first sliding member 130, and the other end of the coil spring 8 is supported by the spring support member 9. The spring support member 9 is restricted from retracting by the rear end surface of the front shaft 12. The refill 7 penetrates the coil spring 8 and the spring support member 9. The refill 7 is integrally attached to the first sliding member 130 by inserting the rear end portion of the refill 7 into the inside through the opening in front of the sliding main body portion 131 and fitting the refill 7 (FIG. 18). ).

FIG. 22 is a perspective view of the first ballpoint pen 5 in the non-writing state, and FIG. 23 is a perspective view of the first ballpoint pen 5 in the writing state. In FIGS. 22 and 23, the rear axle 110 is omitted.

In the non-writing state shown in FIG. 22, the retracting of the first sliding member 130 by the coil spring 8 is such that the cam arm 124 of the third rotating member 120 with respect to the key protrusion 115 of the rear shaft 110, as will be described later. The cam arm 124 is restricted by engaging with the cam protrusion 132 in a state where the rotation of the third rotating member 120 is restricted by abutting in the circumferential direction. At this time, the cam surface 125 of the third rotating member 120 is arranged at the start end portion 134a on the cam receiving surface 134 of the first sliding member 130.

From this state, when the grip portion 121 is gripped and the third rotating member 120 is rotated, the cam surface 125 of the third rotating member 120 and the cam receiving surface 134 of the first sliding member 130 cooperate with each other. 3 The force in the rotation direction applied to the rotating member 120 is converted into a force for advancing the first sliding member 130. That is, on the cam surface 125 and the cam receiving surface 134, the first sliding member 130 moves forward against the urging force of the coil spring 8 by receiving an axial component force from the slopes inclined in the same direction. When the cam surface 125 of the third rotating member 120 moves to the end portion 134b on the cam receiving surface 134 of the first sliding member 130, the advance of the first sliding member 130 is stopped, and the first ballpoint pen 5 is in the writing state. (Fig. 23).

On the other hand, in the writing state shown in FIG. 23, by rotating the third rotating member 120 in the opposite direction, the first sliding member 130 retracts under the urging force of the coil spring 8. When the cam surface 125 of the third rotating member 120 moves to the start end portion 134a on the cam receiving surface 134 of the first sliding member 130, the retreat of the first sliding member 130 stops, and the first ballpoint pen 5 is in a non-writing state. (Fig. 22).

FIG. 24 is a cross-sectional view illustrating the operation of the first rotary feeding mechanism. Specifically, FIG. 24 is a cross-sectional view of the first ballpoint pen 5 including the locking projection 127 of the third rotating member 120. FIG. 24A shows a first ballpoint pen 5 in a non-writing state corresponding to FIG. 22 in which the third rotating member 120 is rotated in one direction. On the other hand, FIG. 24B shows a first ballpoint pen 5 in a writing state corresponding to FIG. 23, in which the third rotating member 120 is rotated to the other.

As shown in FIG. 24 (A), one of the cam arms 124 is in contact with one of the key protrusions 115 in the circumferential direction. On the other hand, as shown in FIG. 24B, one of the cam arms 124 is in contact with the other of the key protrusion 115 in the circumferential direction. In each case, that is, when the cam arm 124 is in contact with the key protrusion 115, the locking protrusion 127 of the third rotating member 120 is fitted in the locking recess 114 of the rear shaft 110. In short, the locking protrusion 127 gets over the small protrusion 113 in response to the rotation of the third rotating member 120, and the cam arm 124 abuts on the key protrusion 115 and at the same time fits into the locking recess 114. As a result, the third rotating member 120 can be temporarily fixed, and the writing state or the non-writing state is prevented from being unintentionally released.

When the locking protrusion 127 gets over the small protrusion 113, the rectangular protrusion 126 bends inward in the radial direction, so that the locking protrusion 127 snaps into the locking recess 114. Therefore, the user can obtain the feedback of the completion of the feeding as a click sound or a click feeling. By changing the height of the small protrusion 113 or the locking protrusion 127, the degree of click sound or click feeling can be freely designed.

In short, the above-mentioned first rotation feeding mechanism includes a shaft cylinder 11 provided with a locking portion inside, a third rotating member 120 rotatably provided around the central axis with respect to the rear shaft 110, and a third. A first sliding member 130 that cooperates with the rotating member 120 is provided, and each of the third rotating member 120 and the first sliding member 130 has a third rotating member 120 and the other of the first sliding member 130. A cam surface that cooperates with each other is formed, and the first sliding member 130 moves back and forth in the barrel 11 according to the rotation direction of the third rotating member 120 to rotate the third rotating member 120 in one direction. The first sliding member 130 advances until the third rotating member 120 engages with the locking portion, and when the third rotating member 120 is rotated to the other side, the third rotating member 120 engages with the locking portion. The first sliding member 130 retracts until it reaches the end.

Here, the locking portion includes a first locking portion that locks the forward rotation of the third rotating member 120 and a second locking portion that locks the reverse rotation of the third rotating member 120. Have. The first locking portion is specifically a key protrusion 115, and the second locking portion is specifically a locking recess 114. The "forward direction" means the direction in which the user intentionally rotates, and the "reverse direction" means the direction opposite to the direction in which the user intentionally rotates. Further, the third rotating member 120 has a first locked portion that engages with the first locking portion and a second locked portion that engages with the second locking portion. The first locked portion is specifically a cam arm 124, and the second locked portion is specifically a locking projection 127.

The cam surface 125 of the third rotating member 120 and the cam receiving surface 134 of the first sliding member 130 are arbitrarily configured as long as the rotational motion of the third rotating member 120 can be converted into the linear motion of the first sliding member 130. obtain. Therefore, a cam surface that cooperates with the other of the third rotating member 120 or the first sliding member 130 may be formed on at least one of the third rotating member 120 or the first sliding member 130. Further, each of the cam arm 124 of the third rotating member 120 and the cam protrusion 132 of the corresponding first sliding member 130 may be at least one, and may be three or more, and may have different numbers from each other. May be good.

According to the above-mentioned first rotation feeding mechanism, as described above, when the third rotating member 120 is rotated in one direction, the first sliding member 130 advances until the third rotating member 120 is engaged with the locking portion. Then, when the third rotating member 120 is rotated to the other side, the first sliding member 130 retracts until the third rotating member 120 is engaged with the locking portion. Therefore, it is possible to reliably feed out with a lean operation and structure. Further, since it has a first locking portion for locking the forward rotation of the third rotating member 120 and a second locking portion for locking the reverse rotation of the third rotating member 120. Since the intended rotation is stopped and the reverse rotation is prevented at the same time, more reliable feeding is possible.

Further, the cam surface which is a mechanism for converting the rotational motion into a straight motion, that is, the cam surface 125 of the third rotating member 120 and the cam receiving surface 134 of the first sliding member 130 and a mechanism for locking the rotation. The stop portion, that is, the locking recess 114, the key protrusion 115, the cam arm 124, and the locking protrusion 127 are arranged apart from each other, specifically, apart from each other in the axial direction. Therefore, since separate mechanisms of motion conversion and rotation locking can be independently designed and arranged, the above-mentioned first rotation feeding mechanism enables more free design. For example, by changing the angle of inclination of the cam surface 125 of the third rotating member 120 and the cam receiving surface 134 of the first sliding member 130, the straight-ahead amount with respect to the rotation amount can be easily adjusted. Further, according to the above-mentioned first rotary feeding mechanism, the rotary feeding mechanism can be realized with a smaller number of parts than the conventional rotary feeding mechanism, and the molding or processing of the parts can be easily performed.

Since the rotation of the third rotating member 120 is restricted by the side surface of the cam arm 124 coming into contact with the side surface of the key protrusion 115 of the rear shaft 110, even if the third rotating member 120 is to be rotated by an excessive force. , The rotation can be surely regulated. Further, since the mechanism that regulates such rotation is separated from the conversion mechanism that converts the rotational movement into a straight motion and the locking mechanism that locks the rotation, the conversion mechanism and the locking mechanism are damaged by the excessive force. I won't let you.

The first rotary feeding mechanism described above can be widely applied to all coating tools. That is, the applicator includes the above-mentioned first rotation feeding mechanism and the applicator body, and the applicator body moves back and forth together with the sliding member. Here, the "applicant" is not only an applicator for correction fluid, adhesives, chemicals, etc., and a cosmetic applicator such as mascara, eyeliner, lipstick, and manicure, but also a ballpoint pen, a sign pen, a marker pen, and a mechanical pencil. It also includes a wide range of writing tools such as pencils, fountain pens, and heat-discolorable writing tools. Further, the "coating body" broadly includes a writing body such as a refill of a ballpoint pen, an ink container for an eyeliner, and the like, depending on the above-mentioned coating tool.

The refill as a cursive in a thermochromic writing instrument may contain a thermochromic ink. In this case, the handwriting can be thermally discolored by the frictional heat generated when the handwriting is scraped by the friction body which is an erasing member. Here, the thermochromic ink maintains a predetermined color (first color) at room temperature (for example, 25 ° C.), and changes to another color (second color) when the temperature is raised to a predetermined temperature (for example, 60 ° C.). The ink has the property of returning to the original color (first color) when cooled to a predetermined temperature (for example, −5 ° C.). In a heat-changing writing tool using heat-changing ink, making the second color colorless and raising the temperature of the drawn line written in the first color (for example, red) to make it colorless is, here, "erasing". And. Therefore, the drawn line is rubbed against the written surface or the like on which the drawn line is written by a friction body as an erasing portion to generate frictional heat, whereby the drawn line is changed to colorless, that is, erased. As a matter of course, the second color may be colored other than colorless.

Next, a rotation lock mechanism using the above-mentioned rotation feeding mechanism will be described. FIG. 25 is a vertical cross-sectional view of the fourth mechanical pencil 4. Compared with the first mechanical pencil 1, the fourth mechanical pencil 4 has a fifth rotation lock mechanism instead of the first rotation lock mechanism, and the second rotation extension mechanism is replaced with the first rotation extension mechanism. It has a mechanism. The fifth rotation lock mechanism has a fourth rotation member 150, a second sliding member 160, and an urging spring 169, and utilizes the above-mentioned rotation feeding mechanism. A fifth rotation lock mechanism may be configured by applying another rotation feeding mechanism. The second rotation feeding mechanism of the fourth mechanical pencil 4 differs greatly only in the length of the sliding member as compared with the first rotation feeding mechanism of the first ballpoint pen 5.

FIG. 26 is a vertical cross-sectional view of the rear end portion of the rear shaft 140 of the fourth mechanical pencil 4. In FIG. 26, the upper side is the rear side of the fourth mechanical pencil 4. An annular protrusion 141 is provided along the circumferential direction on the inner peripheral surface of the rear portion of the rear shaft 140. As shown in FIG. 29, which will be described later, the annular protrusion 141 is not provided over the entire circumference. For example, on the inner peripheral surface of the rear shaft 140, a recess 142 is defined in place of the annular protrusion 141 on a part along the circumferential direction, for example, a quarter of the entire circumference. The recess 142 is provided with two small protrusions 143, respectively, slightly spaced from both ends of the annular protrusion 141. As a result, two locking recesses 144 are defined between the annular protrusion 141 and the small protrusion 143. A key protrusion 145 is provided at the center of the annular protrusion 141 in the circumferential direction, and a similar key protrusion 145 is provided at the center of the recess 142 in the opposite circumferential direction. The two key protrusions 145 are provided adjacent to the annular protrusion 141 in the axial direction.

FIG. 27 is a perspective view of the fourth rotating member 150 of the fourth mechanical pencil 4. In FIG. 27, the upper side is the rear side of the fourth mechanical pencil 4. The fourth rotating member 150 is rotatably attached to the rear shaft 140 around the central axis. The fourth rotating member 150 has a cylindrical grip portion 151 that is gripped by the user when it is rotated. A clip 151a is provided on the outer peripheral surface of the grip portion 151. In front of the grip portion 151, an insertion portion 152 which is formed to have a smaller diameter and is inserted into the rear shaft 140 is provided. The insertion portion 152 is provided with two notched portions 153 that are substantially rectangular and face each other from the front end surface toward the rear. Two notches 153 define two cam arms 154 extending forward. The front end surfaces of the two cam arms 154 are provided with cam surfaces 125 inclined in the same direction along the circumferential direction. A rectangular protrusion 156 extending forward is defined in the central portion of the front end surface of the insertion portion 152 in one notch portion. A locking protrusion 157 is provided on the outer surface of the rectangular protrusion 156. On the outer surface of each of the two cam arms 154, a sliding groove 158 is provided along the circumferential direction at the same position as the locking protrusion 157 in the axial direction.

FIG. 28 is a perspective view of the second sliding member 160 of the fourth mechanical pencil 4. In FIG. 28, the upper side is the rear side of the fourth mechanical pencil 4. The second sliding member 160 has a sliding main body portion 161. Two cam protrusions 162 are provided on the outer peripheral surface of the sliding main body portion 161. The two cam protrusions 162 are separated from each other by two key grooves 163 extending along the axial direction. The rear end surfaces of the two cam protrusions 162 are provided with a similarly inclined cam receiving surface 164 corresponding to the cam surface 155 of the fourth rotating member 150. In each of the cam receiving surfaces 164, the portion located at the front is defined as the start end portion 164a, and the portion located at the rearmost is defined as the end portion 164b. The second sliding member 160 is provided with a through hole 165 along the central axis, and the core case 23 is inserted into the through hole 165.

In the axle cylinder 11, the fourth rotating member 150 is inserted into the inside from the rear of the rear shaft 140. At this time, the two cam arms 154 bend inward in the radial direction, and the annular protrusion 141 of the rear shaft 140 is arranged in the sliding groove 158. When the fourth rotating member 150 is rotated around the central axis with respect to the rear shaft 140, the sliding groove 158 acts as a rail, and the annular protrusion 141 can be relatively moved within the sliding groove 158. .. Further, by arranging the annular protrusion 141 of the rear shaft 140 in the sliding groove 158 of the fourth rotating member 150, the fourth rotating member 150 is less likely to come off from the rear shaft 140. The locking protrusion 157 of the fourth rotating member 150 is arranged in the recess 142.

The second sliding member 160 is inserted into the inside from the front of the rear shaft 140, and the rear end portion of the sliding main body portion 161 is inserted into the inside from the front of the fourth rotating member 150. When the second sliding member 160 is inserted, the cam arm 154 of the fourth rotating member 150 is placed so that the key protrusion 145 of the rear shaft 140 is arranged in the key groove 163 of the second sliding member 160. 2 Guided by the cam receiving surface 164 of the sliding member 160. By arranging the key protrusion 145 in the key groove 163, the second sliding member 160 can be moved back and forth in the shaft cylinder 11 without rotating around the central axis. By inserting the sliding main body 131 of the second sliding member 160 into the inside of the fourth rotating member 150, the two cam arms 154 cannot bend inward in the radial direction. As a result, it is possible to prevent the fourth rotating member 150 from falling off from the rear shaft 140.

The second sliding member 160 is urged rearward by the urging spring 169. One end of the urging spring 169 abuts on a step provided inside the second sliding member 160, and the other end of the urging spring 169 is supported by the rear end surface of the rotary drive mechanism 22. The retreat of the rotation drive mechanism 22 due to the urging force of the shaft spring 26 is restricted by the rear end surface of the rotation drive mechanism 22 abutting on the front end surface 146 of the key protrusion of the rear shaft 140.

FIG. 29 is a cross-sectional view illustrating the operation of the second rotation feeding mechanism, and FIG. 30 is a vertical cross-sectional view illustrating the operation of the fifth rotation locking mechanism and the second rotation feeding mechanism. FIG. 29 is specifically a cross-sectional view of the fourth mechanical pencil 4 including the locking protrusion 157 of the fourth rotating member 150. The state shown in FIGS. 29 (A) and 30 (A) is the rotation unlocked state in which the rotation drive mechanism 22 is on, and the state shown in FIGS. 29 (B) and 30 (B) is the state in which the rotation drive mechanism 22 is on. The rotation drive mechanism 22 is in the rotation lock state of being off.

In the rotation lock release state shown in FIGS. 29 (A) and 30 (A), the retreat of the second sliding member 160 by the urging spring 169 is caused by the cam arm 154 of the fourth rotating member 150, as will be described later. The cam arm 154 is regulated by engaging with the cam protrusion 162 in a state where the rotation of the fourth rotating member 150 is restricted by abutting on the key protrusion 145 of the rear shaft 140 in the circumferential direction. At this time, the cam surface 155 of the fourth rotating member 150 is arranged at the start end portion 164a on the cam receiving surface 164 of the second sliding member 160.

From this state, when the grip portion 151 is gripped and the fourth rotating member 150 is rotated, the cam surface 155 of the fourth rotating member 150 and the cam receiving surface 164 of the second sliding member 160 cooperate with each other. 4 The force in the rotation direction applied to the rotating member 150 is converted into a force for advancing the second sliding member 160. That is, on the cam surface 155 and the cam receiving surface 164, a component force in the axial direction is received from slopes inclined in the same direction, and the second sliding member 160 advances against the urging force of the urging spring 169. When the cam surface 155 of the fourth rotating member 150 moves to the end portion 164b on the cam receiving surface 164 of the second sliding member 160, the advance of the second sliding member 160 is stopped, and the rotation drive mechanism 22 is in the rotation locked state. (FIG. 29 (B) and FIG. 30 (B)).

In the rotation-locked state, the urging spring 169 is more compressed because the second sliding member 160 is advanced. One end of the urging spring 169 is in contact with the second sliding member 160, and the other end of the urging spring 169 is in contact with the rear end surface of the rotary drive mechanism 22. Therefore, the rotary drive mechanism 22 is compared with the state shown in FIG. 30 (A) by the balance between the forward urging force increased by the compression of the urging spring 169 and the rearward urging force of the shaft spring 26. Then, it is moving forward by the distance D.

When the rotation drive mechanism 22 advances, the minute clearance existing between each member in the barrel 11, for example, the clearance existing between the mouth member 14, the chuck unit 20, the relay member 21, and the like disappears. As a result, the rotor 30 is in a relatively retracted state in the rotation drive mechanism 22, and is in the state of the rotor 30 shown in FIG. 4C, so that the rotation of the rotor 30 is locked.

On the other hand, in the rotation lock state, by rotating the fourth rotating member 150 in the opposite direction, the second sliding member 160 retracts under the urging force of the urging spring 169. When the cam surface 155 of the fourth rotating member 150 moves to the start end portion 164a on the cam receiving surface 164 of the second sliding member 160, the retreat of the second sliding member 160 stops, and the rotation drive mechanism 22 releases the rotation lock. It becomes a state (FIG. 29 (A) and FIG. 30 (A)).

The rotation of the fourth rotating member 150 is restricted by the side surface of the cam arm 154 abutting on the side surface of the key protrusion 145 of the rear shaft 140. That is, as shown in FIG. 29 (A), one of the cam arms 154 is in contact with one of the key protrusions 145 in the circumferential direction. On the other hand, as shown in FIG. 29B, one of the cam arms 154 is in contact with the other of the key protrusion 145 in the circumferential direction. In each case, that is, when the cam arm 154 is in contact with the key protrusion 145, the locking protrusion 157 of the fourth rotating member 150 is fitted in the locking recess 144 of the rear shaft 140. In short, the locking protrusion 157 gets over the small protrusion 143 in response to the rotation of the fourth rotating member 150, and the cam arm 154 comes into contact with the key protrusion 145 and at the same time fits into the locking recess 144. As a result, the fourth rotating member 150 can be temporarily fixed, and the rotation lock state or the rotation lock release state is prevented from being unintentionally released.

When the locking protrusion 157 gets over the small protrusion 143, the rectangular protrusion 156 bends inward in the radial direction, so that the locking protrusion 157 snaps into the locking recess 144. Therefore, the user can obtain the feedback of the completion of the feeding as a click sound or a click feeling. By changing the height of the small protrusion 143 or the locking protrusion 157, the degree of click sound or click feeling can be freely designed.

In addition, a second rotation feeding mechanism that advances or retracts the second sliding member 160 by the rotation of the fourth rotating member 150, and a protruding / retracting mechanism that feeds the writing core by a knock operation that presses the knock member 24 or the knock cover 15 forward. Can be operated independently. Therefore, in the fourth mechanical pencil 4, the knock operation can be performed even if the rotation drive mechanism is turned on or off by the fifth rotation lock mechanism.

FIG. 31 is a vertical sectional view illustrating the operation of the sixth rotation lock mechanism. The sixth rotation lock mechanism has a spacer 100 in addition to the configuration of the fifth rotation lock mechanism. The spacer 100 is arranged in front of the rotor 30. Specifically, it is arranged so as to fit on the outer peripheral surface of the relay member 21 at the rear end portion of the front shaft 12. When the second sliding member 160 and, by extension, the rotary drive mechanism 22 move forward by operating the second rotary feeding mechanism, the front end surface of the rotor 30 comes into contact with the rear end face of the spacer 100, and the advance of the rotor 30 is restricted. To. As a result, the state of the rotor 30 shown in FIG. 4C is obtained, and the rotation of the rotor 30 is locked.

Since the sixth rotation lock mechanism has the spacer 100 in addition to the fifth rotation lock mechanism, the spacer 100 directly presses the rotor 30, so that the rotation of the rotor 30 is locked more reliably. can do.

The rotation lock mechanism may be arbitrarily configured as long as the rotor is configured to be locked in a relatively retracted state in the rotation drive mechanism. The rotation lock mechanism may be configured to push the rotor backwards or push the rotation drive mechanism forwards so that the rotor is relatively retracted in the rotation drive mechanism. The rotor or rotation drive mechanism may be pressed directly or indirectly by the rotation lock mechanism. The rotary lock mechanism may have a rotary member with a cam, and the rotary motion of the rotary member may be converted into a linear motion by the action of the cam so that the rotor is pressed.

As a matter of course, even when the rotation lock mechanism locks the rotor, the writing core can be extended by moving the chuck unit 20 back and forth. That is, the state in which the rotation lock mechanism locks the rotor does not affect the forward movement or backward movement of the chuck unit 20 due to the knock operation. Therefore, a mechanical pencil with the rotor locked by the rotation lock mechanism can be used in the same manner as a normal mechanical pencil. Therefore, for example, in the case of shorthand writing, if the advancement and retreat of the writing core by the rotation drive mechanism feels troublesome, the rotation drive mechanism can be turned off. On the other hand, the rotation drive mechanism can be turned on when performing careful writing in which the non-uniformity of the thickness of the handwriting due to uneven wear of the writing core is prevented. In short, the user can freely switch the rotation drive mechanism on (operate or enable) and off (stop or disable).

According to the second rotation lock mechanism, the rotor is pressed backward through the chuck unit, but the core case is retracted by pressing the core case from the front to the rear or pulling the core case from the rear. You may. By retracting the core case, the relay member 21 retracts, and as a result, the rotor can be retracted, and the rotation drive mechanism 22 can be put into the rotation lock state.

The rotation lock mechanism may have a retracting mechanism or a rotation feeding mechanism that pushes the rotation driving mechanism forward. The hoisting mechanism or the rotary feeding mechanism may have a spring and a sliding member for urging the spring, and the sliding member may be advanced to press the rotary drive mechanism forward. The haunting mechanism further has a knock member and a knock rotor arranged at the rear end of the axle tube, and when the knock rotor is knocked to advance the knock rotor to a predetermined position, the knock rotor is centered. It may rotate around the axis to lock the retreat of the knock rotor, and may advance the rotation drive mechanism so that the rotor is locked in a relatively retracted state in the rotation drive mechanism.

1 1st sharp pencil 5 1st ball pen 8 Coil spring 11 Shaft cylinder 12 Front shaft 14 Mouth member 15 Knock cover 16 Tip pipe 17 Eraser 18 Slider 19 Holding chuck 20 Chuck unit 21 Relay member 22 Rotation drive mechanism 23 Core case 24 Knock member 25 Coil spring 26 Shaft spring 30 Rotator 31 Upper cam forming member 32 Lower cam forming member 33 Cylinder member 34 Torque canceller 35 Cushion spring 40 Rear shaft 41 Regulatory protrusion 42 Front end surface 43 Through hole 44 Inclined cam receiving surface 50 Changeover switch 51 Switch support 52 Switch 54 1st rotating member 55 Cam body 56 Opening 57 Support plate 58 Gap 59 Inclined cam surface 110 Rear shaft 120 3rd rotating member 121 Gripping part 122 Inserting part 123 Notch part 124 Cam arm 125 Cam surface 130 No. 1 Sliding member 131 Sliding main body 132 Cam protrusion 133 Keyway 134 Cam receiving surface

Claims (12)

By releasing and gripping the writing core by the back-and-forth movement of the chuck unit arranged in the shaft cylinder, the writing core is configured to be extended forward, and the chuck unit is centered in a state where the writing core is gripped. A mechanical pencil held in the barrel so that it can rotate around the axis.
It has a rotor, and is provided with a rotation drive mechanism for rotating the rotor by retracting the rotor as the chuck unit retracts due to the writing pressure received by the writing core. Is transmitted to the writing core via the chuck unit in a sharp pencil.
A mechanical pencil further comprising a rotation lock mechanism for locking the rotation of the rotor. The mechanical pencil according to claim 1, wherein the rotation lock mechanism is configured to lock the rotor in a relatively retracted state in the rotation drive mechanism. According to claim 2, the rotation lock mechanism is configured to push the rotor backward or push the rotation drive mechanism forward so that the rotor is relatively retracted in the rotation drive mechanism. The sharp pencil described. The mechanical pencil according to claim 3, wherein the rotor or the rotation drive mechanism is directly or indirectly pressed by the rotation lock mechanism. The mechanical pencil according to claim 4, wherein the rotary lock mechanism has a rotary member provided with a cam, and the rotary motion of the rotary member is converted into a linear motion by the action of the cam, and the rotor is pressed. The mechanical pencil according to claim 5, wherein the rotor is pressed backward through the chuck unit. The mechanical pencil according to claim 3 or 4, wherein the rotation lock mechanism has a retracting mechanism or a rotation feeding mechanism that presses the rotation driving mechanism forward. The seventh aspect of claim 7, wherein the retracting mechanism or the rotary feeding mechanism has a spring and a sliding member for urging the spring, and the sliding member is advanced to press the rotary drive mechanism forward. mechanical pencil. The haunting mechanism further comprises a knock member and a knock rotor arranged at the rear end of the barrel.
When the knock rotor is advanced to a predetermined position by knocking the knock member, the knock rotor rotates around the central axis, the retracting of the knock rotor is locked, and the rotation drive mechanism is used. 7. The sharp pencil according to claim 7 or 8, wherein the rotor is locked in a state of being relatively retracted in the rotation drive mechanism by advancing the rotor. The mechanical pencil according to any one of claims 7 to 9, wherein the rotor is pressed backward through a spacer. The mechanical pencil according to any one of claims 1 to 10, wherein the writing core is extended by moving the chuck unit back and forth while the rotation lock mechanism locks the rotor. The rotation drive mechanism has a first cam forming member and a second cam forming member.
The rotor is formed in an annular shape, and a first cam surface and a second cam surface are formed on one end surface and the other end surface in the axial direction thereof, and the first cam surface and the second cam surface face each other, respectively. The first fixed cam surface and the second fixed cam surface formed on the first cam forming member and the second cam forming member are arranged in such a manner.
The retracting operation of the chuck unit due to the writing pressure causes the first cam surface of the rotor to abut and mesh with the first fixed cam surface, and the release of the writing pressure causes the second cam of the rotor to come into contact with the first cam surface. The surface is configured to abut and mesh with the second fixed cam surface.
In a state where the first cam surface of the rotor is meshed with the first fixed cam surface, the second cam surface of the rotor and the second fixed cam surface become one tooth of the cam in the axial direction. In a state where the second cam surface of the rotor is meshed with the second fixed cam surface, the first cam surface and the first fixed cam surface of the rotor are set to be out of phase with each other. Is set to be out of phase with respect to one tooth of the cam in the axial direction.
The mechanical pencil according to any one of claims 1 to 11, wherein the rotation drive mechanism engages the first cam surface of the rotor with the first fixed cam surface to lock the rotor.

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