KR20230096997A - mechanical pencil - Google Patents

Abstract

The writing lead is released and gripped by the back and forth movement of the chuck unit 20 disposed in the barrel 11, so that the writing lead is drawn forward, and the chuck unit 20 moves along the central axis line in a state where the writing lead is held. The first mechanical pencil 1 held in the barrel 11 so as to be able to rotate around has a rotor 30, and the chuck unit 20 moves backward due to the writing pressure applied to the writing lead so that the rotor rotates. 30 is retracted, and the rotor 30 is provided with a rotational drive mechanism 22 that rotates the rotor 30, and the rotational motion of the rotor 30 is transmitted to the writing lead via the chuck unit 20 And, a rotation lock mechanism for locking the rotation of the rotor 30 is further provided.

Description

mechanical pencil

The present invention relates to a mechanical pencil.

A rotational member including a slider having a chuck for allowing advancement of a writing lead and preventing retraction, a retreating operation in an axial direction by a writing pressure applied to a writing lead held by a rotor and a writing lead held by the chuck, and release of the writing pressure A mechanical pencil having a rotation drive mechanism for rotationally driving a rotor in one direction in response to forward movement in an axial direction, and configured such that a writing lead rotates when a chuck rotates by receiving rotational driving force of the rotor is known (patented). Literature 1).

International Publication No. 2007/142135

In the mechanical pencil described in Patent Literature 1, since the writing lead rotates as you write, uneven wear of the writing lead can be prevented. On the other hand, in order to rotate the writing lead by the rotational drive mechanism, the writing lead advances and retreats, albeit in a small way, for example, in the case of shorthand writing, etc., when such advances and retreats are cumbersome. there is Therefore, it is desirable to allow the user to freely switch between on (activation or activation) and off (stopping or inactivation) of the rotary drive mechanism.

An object of the present invention is to provide a mechanical pencil capable of freely switching on and off a rotation drive mechanism.

According to one aspect of the present invention, the writing lead is released and gripped by forward and backward movement of a chuck unit disposed in a barrel, so that the writing lead is drawn out forward, and the chuck A mechanical pencil held in the barrel so that the unit is rotatable around a central axis while holding the writing lead, has a rotor, and moves the chuck unit to retract by the writing pressure applied to the writing lead, A mechanical pencil having a rotational drive mechanism for rotating the rotor by retracting the rotor, and transmitting the rotational motion of the rotor to the writing lead via the chuck unit, wherein the rotation of the rotor There is provided a mechanical pencil characterized in that it further comprises a rotation lock mechanism for locking.

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 backward or press the rotation drive mechanism forward to cause the rotor to move relatively backward in the rotation drive mechanism.

The rotor or the rotation drive mechanism may be directly or indirectly pressed by the rotation lock mechanism. The rotation lock mechanism may include a rotating member with a cam, and rotational motion of the rotating member may be converted into linear motion by an action of the cam, and the rotor may be pressed.

The rotor may be pressed backward via the chuck unit. The rotation lock mechanism may have a protruding/retracting mechanism or a rotation drawing mechanism for pressing the rotation drive mechanism forward.

The protruding/retracting mechanism or the rotary drawing/out mechanism may have a spring and a sliding member that urges the spring, and may advance the sliding member to press the rotary driving mechanism forward.

The projecting/retracting mechanism further has a knock member and a knock rotor arranged at the rear end of the barrel, and when a knock operation of the knock member is performed to advance the knock rotor to a predetermined position, the knock rotor rotates around the central axis. It may be rotated to stop the retraction of the knock rotor, and the rotation drive mechanism may be advanced so that the rotor is locked in a relatively retracted state in the rotation drive mechanism. The rotor may be pressed backward via a spacer.

The lead may be drawn out by moving the chuck unit back and forth in a state where 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 a ring 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, respectively. , a first fixed cam surface and a second fixed cam surface formed on the first cam forming member and the second cam forming member are disposed to face the first cam surface and the second cam surface, respectively, and the chuck unit by the writing pressure by the retracting operation, the first cam surface of the rotor abuts against and engages with the first fixed cam surface, and by releasing the writing pressure, the second cam surface of the rotor engages with the second fixed cam surface. configured to abut and engage with each other, and in a state in which the first cam surface of the rotor is engaged with the first fixed cam surface, the second cam surface and the second fixed cam surface of the rotor are in an axial direction In a state in which the phase is set in an out of phase relationship with respect to one tooth of the cam, and the second cam surface of the rotor is engaged with the second fixed cam surface, the first cam surface of the rotor and The first fixed cam surface is set to be out of phase with respect to one tooth of the cam in the axial direction, and the rotation drive mechanism engages the first cam surface of the rotor with the first fixed cam surface. Thus, the rotor may be locked.

ADVANTAGE OF THE INVENTION According to the aspect of this invention, the common effect of providing the mechanical pencil which can freely switch ON and OFF of a rotary drive mechanism is achieved.

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

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described in detail, referring drawings. Throughout all figures, corresponding elements are given common reference numerals.

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

The first mechanical pencil 1 has a barrel 11 formed in a cylindrical shape. The barrel 11 has a front shaft 12, a rear shaft 40 fitted or screwed to the rear end of the front shaft 12, and an inlet member 14 fitted or screwed to the front end of the front shaft 12. there is. The first mechanical pencil 1 is configured such that a writing lead protrudes from a tip pipe 16 provided at the tip of an inlet member 14. In this specification, in the axial direction of the first mechanical pencil 1, the lead side is defined as the "front" side, and the side opposite to the lead side is defined as the "rear" side.

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

To the rear end of the slider 18, a chuck unit 20 for gripping a writing lead and a relay member 21 formed in a cylindrical shape are connected. According to the chuck unit 20, when a writing pressure is applied to the writing lead, the writing lead is gripped to prevent the writing lead from retracting, and when a force for pulling the writing lead forward is applied, the writing lead is pulled forward without resistance. can do.

The chuck unit 20 and the relay member 21 are integrally movable together with the slider 18 in the axial direction. The rear end of the relay member 21 is connected to the rotation drive mechanism 22 . The front end of the shim case 23 is fitted to the outer circumferential surface of the rear end of the chuck unit 20 . The lead case 23 is formed in a cylindrical shape, and a writing lead is accommodated therein.

Inside the rear end of the barrel 11, specifically, the rear end of the rear barrel 40, a knocking member 24 is provided with respect to the barrel 11 so as to be movable back and forth. The knock member 24 is biased backward by the coil spring 25. Inside the rear end of the knock member 24, the eraser 17 is attached detachably. The knock cover 15 described above is detachably attached to the outer circumferential surface of the rear end of the knock member 24 to protect the eraser 17 from dirt and the like.

The shim case 23 advances by carrying out a knocking operation of pressing the knock member 24 or the knock cover 15 forward. This also advances the writing lead via the chuck unit 20 and acts to draw the writing lead out of the tip pipe 16 . When the pressing by the knocking operation is released, the knocking member 24 retreats and returns to the original position by the biasing force of the coil spring 25 . At this time, since the lead is held by the holding chuck 19 disposed within the slider 18, the lead is pulled out of the chuck unit 20 without resistance as a function of the chuck unit 20. As a result, since the lead is drawn out from the tip pipe 16, it is possible to draw out the lead by a predetermined amount each time the knocking operation is repeated.

3 is an enlarged sectional view of the rotary drive mechanism 22 . The rotation drive mechanism 22 is disposed in the inner space of the rear shaft 40 . The rotation drive mechanism 22 is connected to the rear end of the relay member 21 . An axial spring 26 is disposed 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 biased backward. Retraction of the rotation drive mechanism 22 by the biasing force of the shaft spring 26 occurs when the rear end face of the rotation drive mechanism 22 abuts against the front end face 42 of the regulating projection 41 of the rear shaft 40 described later. regulated by The shim 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 includes a rotor 30 formed in a cylindrical shape, an upper cam forming member 31 as a first cam forming member formed in a cylindrical shape, and a lower cam forming member as a second cam forming member formed in a cylindrical shape. It has a member 32, a cylinder member 33 formed in a cylindrical shape, a torque canceller 34 formed in a cylindrical shape, and a coil-shaped cushion spring 35. In the rotation drive mechanism 22, these members are integrated and unitized.

Further, in front of the rotation drive mechanism 22, a first rotation lock mechanism having a selector switch 50 and a first rotation member 54 is disposed so as to be described later.

The outer circumferential surface of the rear end of the relay member 21 is fitted to the inner circumferential surface of the front end of the rotor 30 . The vicinity of the front end of the rotor 30 has a portion formed in a flange shape with a slightly larger diameter, a first cam surface 30a is formed on the rear end surface of the portion, and a second cam surface 30b is formed on the front end surface of the portion. ) is formed.

The upper cam forming member 31 surrounds the rotor 30 so as to be able to rotate, behind the first cam surface 30a of the rotor 30 . The lower cam forming member 32 is fitted to the outer circumferential surface of the front end 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 . On the inner surface of the front end of the lower cam forming member 32 facing the second cam surface 30b of the rotor 30, a second fixed cam surface 32a is formed.

A cylinder member 33 formed in a cylindrical shape is fitted to the outer circumferential surface of the rear end of the upper cam forming member 31 . At the rear end of the cylinder member 33, an insertion hole 33a through which the shim case 23 can be inserted is formed. Inside the cylinder member 33, a torque canceller 34 formed in a cylindrical shape and movable forward and backward is disposed. A cushion spring 35 is disposed between the inner surface of the front end of the torque canceller 34 and the inner surface of the rear end of the cylinder member 33 . The cushion spring 35 presses the rotor 30 forward through the torque canceller 34 .

Here, the relay member 21 transmits the retracting and advancing motions (cushion motion) of the writing lead based on the writing motion to the rotation driving mechanism 22, that is, the rotor 30, and rotational drive generated by the cushion motion. The rotational motion of the rotor 30 in the mechanism 22 is transmitted to the chuck unit 20 holding the writing lead. Accordingly, the lead held in the chuck unit 20 also rotates.

Except when writing with the first mechanical pencil 1, that is, when writing pressure is not applied to the writing lead, the rotor 30 uses a cushion spring 35 via the torque canceller 34 It is located in the front by the pressing force of Accordingly, the second cam surface 30b of the rotor 30 comes into contact with the second fixed cam surface 32a and is engaged with each other. When writing with the first mechanical pencil 1, that is, when writing pressure is applied to the writing lead, the chuck unit 20 resists the urging force of the cushion spring 35 and retreats. The rotor 30 also retracts. Accordingly, the first cam surface 30a of the rotor 30 comes into contact with the first fixed cam surface 31a and is engaged with each other.

FIG. 4 is a schematic view illustrating the rotation drive of the rotor 30 of the rotation drive mechanism 22, and FIG. 5 is a schematic diagram illustrating the rotation drive of the rotor 30 following FIG. 4 and 5, on the rear end surface, which is the upper surface of the rotor 30, a first cam surface 30a continuously serrated along the circumferential direction is formed in a ring shape, On the front end surface, which is the lower surface, similarly, a second cam surface 30b continuously serrated along the circumferential direction is formed in a ring shape.

The ring-shaped end surface of the upper cam forming member 31 opposing 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. Also, the ring-shaped end face of the lower cam forming member 32 opposing the second cam surface 30b of the rotor 30 is also formed with a second fixed cam surface 32a continuously serrated along the circumferential direction. there is. 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 formed on the upper cam forming member 31 and the lower cam forming member 32 Each cam surface of the formed second fixed cam surface 32a is formed so that the pitch is substantially equal to each other.

4(A) shows the relationship between the rotor 30, the upper cam forming member 31 and the lower cam forming member 32 in a state when writing pressure is not applied to the writing lead. . In this state, the second cam surface 30b formed on the rotor 30 abuts against the second fixed cam surface 32a of the lower cam forming member 32 by the biasing 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 halved with respect to one tooth of the cam in the axial direction. It is set so that it has a phase (half-pitch) shifted relationship.

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

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

4 and 5, the circle drawn at the center of the rotor 30 indicates the amount of rotational movement of the rotor 30. And in the state shown in FIG. 4(C), the 2nd cam surface 30b of the rotor 30 and the 2nd fixed cam surface 32a of the lower cam forming member 32 are the cams in the axial direction. It is set so that it becomes a half-phase (half-pitch) shifted relationship with respect to one tooth.

Next, FIG. 5(D) shows an initial state in which writing with the first mechanical pencil 1 is finished and the writing pressure applied to the writing lead is released. In this case, the rotor 30 advances by the urging force of the cushion spring 35. By this, the rotor 30 moves toward the lower cam forming member 32 side.

Next, FIG. 5(E) shows a state in which the rotor 30 moves forward while abutting against the second fixed cam surface 32a of the lower cam forming member 32 by the biasing force of the cushion spring 35. . In this case, the second cam face 30b of the rotor 30 is engaged with the second fixed cam face 32a of the lower cam forming member 32 . Thereby, the rotor 30 again receives a rotational drive corresponding to a half-phase (half pitch) of one tooth of the second cam surface 30b.

Therefore, as indicated by the circle drawn in the center of the rotor 30, the rotor 30 moves along the axial direction of the reciprocating motion of the rotor 30 receiving the writing pressure, that is, moving back and forth, the rotor 30 moves along the first cam surface. 30a and the second cam surface 30b receive rotational drive corresponding to one tooth (one pitch), and via the chuck unit 20, the lead held by this is also rotationally driven in the same way. Therefore, by one back-and-forth movement of the rotor 30 in the axial direction by writing, the rotor 30 receives a rotational motion corresponding to one tooth of the cam, and by repeating this, the writing lead sequentially rotates. driven In this way, it is possible to prevent the lead from being biased and abraded as the writing progresses, and it is possible to prevent a large change in the thickness of the drawn line or the density of the drawn line.

In addition, the torque canceller 34, which receives the pressing force of the cushion spring 35 and pushes the rotor 30 forward, generates a slip between the front end surface and the rear end surface of the rotor 30, Transmission of the rotational motion of the rotor 30 to the cushion spring 35 is prevented. That is, the cushion spring 35 prevents the rotational motion of the rotor 30 from being transmitted to the cushion spring 35 by the torque canceller 34, thereby inhibiting the rotational motion of the rotor 30. ) to prevent detorsion (torque) from occurring.

From the foregoing, the first mechanical pencil 1 has the chuck unit 20 and the rotor 30, and the lead is released and gripped by the back and forth movement of the chuck unit 20, thereby drawing the lead forward. The chuck unit 20 is held in the barrel 11 so as to be rotatable around the central axis while holding the writing lead, and the chuck unit 20 responds to the retracting operation by the writing pressure applied to the writing lead. As a result, the rotor 30 retracts, and a rotation drive mechanism 22 for rotating the rotor 30 is provided, and the rotation of the rotor 30 moves through the chuck unit 20 to the writing lead. It is configured to be forwarded to.

Here, the principle of the rotary lock mechanism that enables the user to freely switch between on (activation or activation) and off (stopping or invalidation) of the rotation drive mechanism will be described.

The rotor 30 is biased forward by the biasing force of the cushion spring 35 via the torque canceller 34 . Therefore, in a state where writing pressure is not applied to the writing lead, as shown in FIG. They are engaged with each other on the fixed cam face 32a. The rotation lock mechanism locks the first cam surface 30a of the rotor 30 to the upper cam forming member 31 as shown in FIG. 4(C) in a state where writing pressure is not applied to the writing lead. ) are configured to engage with each other on the first fixed cam surface 31a. As a result, even if writing pressure is applied to the writing lead, the rotor 30 retreats and does not rotate. Therefore, rotation of the rotor 30 is locked by the rotation lock mechanism.

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

6 is a longitudinal sectional view of the rear shaft 40 of the first mechanical pencil 1 . In FIG. 6 , the upper side is the rear side of the first mechanical pencil 1 . The through hole 43 described above is provided on the side surface of the front side of the rear shaft 40 . On the inner circumferential surface of the rear shaft 40, an inclined cam receiving surface 44 extending obliquely along the circumferential direction around the central axis and facing forward is provided. At the rear of the inclined cam receiving surface 44, a plurality of regulating projections 41 extending along the axial direction are provided at regular intervals along the circumferential direction. The front end surface 42 of the regulating protrusion 41 restricts the retraction of the rotary driving mechanism 22 .

7 is an exploded perspective view of the changeover switch 50 and the first rotating member 54. As shown in FIG. 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 protrude outward from one end of the outer surface 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 formed 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 to correspond to the inclined cam receiving surface 44 of the rear shaft 40 .

In barrel 11, selector switch 50 is inserted into opening 56 in front of first rotating member 54, and is disposed so as to abut against 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 section 52 is provided only slightly smaller than the width of the gap 58. As shown in FIG. 1 , the switch portion 52 protrudes to the outside through the through hole 43 of the rear shaft 40 . In FIG. 1 , the switch portion 52 is located on the left side within the through hole 43 , but as described below, the switch portion 52 can be slid so as to be located on the right side within the through hole 43 .

Fig. 8 is a longitudinal sectional view explaining the operation of the first rotation lock mechanism. The state shown in FIG. 8(A) is a rotation lock release state in which the rotation drive mechanism 22 is ON, and the state shown in FIG. 8(B) is a rotation lock state in which the rotation drive mechanism 22 is OFF. am. 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. 8(A) corresponds to the state of the switch section 52 shown in FIG. 1 . On the other hand, since the rotation drive mechanism 22 shown in FIG. 8(B) corresponds to the state of the rotor 30 shown in FIG. 4(C), the first cam surface of the rotor 30 ( 30a) and the first fixed cam surface 31a of the upper cam forming member 31 are engaged with each other.

In the longitudinal sectional view of Fig. 8 (A), the switch section 52 is not shown. In the longitudinal sectional view of FIG. 8(A), the inclined cam surface 59 of the first rotating member 54 shown below abuts against the inclined cam receiving surface 44 of the rear shaft 40, but shown upward. The inclined cam surface 59 of the first rotating member 54 does not abut against the inclined cam receiving surface 44 of the rear axle 40 . On the other hand, in the longitudinal cross-sectional view of FIG. 8(B) , all of 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 rotation member 54 shown in FIG. 8(A) have a lower shaft than the changeover switch 50 and the first rotation member 54 shown in FIG. 8(B). In (11), it is arranged at the rear.

By operating the changeover switch 50 from the state shown in FIG. 8(A), specifically, in FIG. 1, the switch portion 52 is slid along the circumferential direction with a finger, By moving from left to right inside, the first rotating member 54 together with the selector switch 50 is rotated around the central axis. Here, the changeover switch 50 and the first rotating member 54 are always pushed backward 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) retreats by the distance D. As a result, the rear end surface of the first rotating member 54, specifically, the support plate 57 presses against the front surface of the rotor 30, causing the rotor 30 to retreat. When the rotor 30 retreats, the state of the rotor 30 shown in FIG. 4(C) is obtained, and the rotation of the rotor 30 is locked.

On the other hand, by operating the selector switch 50 from the state shown in FIG. 8(B), specifically, in FIG. By moving from right to left in 43), the first rotating member 54 together with the changeover switch 50 is reversely rotated around the central axis. As a result, the inclined cam face 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 accordance with the slide, the changeover switch 50 and the first rotating member 54 resist the urging force of the axial spring 26 and move forward by the distance D, resulting in a state shown in FIG. 8(A). As the changeover switch 50 and the first rotating member 54 move forward, the rotor 30 moves forward by the urging force of the cushion spring 35 . When the rotor 30 moves forward, the state of the rotor 30 shown in FIG. 4(A) is obtained, and the rotation lock of the rotor 30 is released. In addition, the through hole 43 of the rear shaft 40 is formed only slightly larger than the shape of the switch portion 52 so as not to hinder the forward or backward movement of the switch portion 52 of the changeover switch 50.

In the first rotational lock mechanism, the changeover switch 50 and the first rotation member 54 convert rotational motion into linear motion according to the operation of the changeover switch 50, and the first rotational member 54 The pressing of the rotor 30 or the release of the pressing can be configured arbitrarily as much as possible. For example, you may configure the changeover switch 50 and the 1st rotation member 54 integrally. 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 also be configured arbitrarily as long as they cooperate with each other.

In the first rotation lock mechanism, the selector switch 50 is slid along the circumferential direction so that the first rotary member 54 rotates, but by sliding the selector switch along the axial direction, the rotor 30 is more directly ) may be advanced or retreated. In this case, the changeover switch may alternatively be switched between an advanced position for pressing the rotor 30 and a retracted position for releasing the pressure on the rotor 30 in the barrel 11 .

In addition, other rotation lock mechanisms described below do not have the selector switch 50 and the first rotation member 54. Therefore, the axial spring 26 is directly urging the rotation drive mechanism 22 backward.

Fig. 9 is a longitudinal sectional view of the second mechanical pencil 2, and Fig. 10 is a longitudinal sectional view explaining the operation of the second rotation lock mechanism. Compared to the first mechanical pencil 1, the second mechanical pencil 2 has a second rotation lock mechanism instead of the first rotation lock mechanism. Therefore, the inclined cam receiving surface 44 or the like is 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 circumferential surface of the inlet member 14 . A spiral cam groove 61 is provided on the inner circumferential surface of the second rotating member 60 . On the other hand, on the outer circumferential surface of the inlet member 14, a corresponding helical cam protrusion 14a is provided. In short, the cam groove 61 of the second rotating member 60 corresponds to a female thread, and the cam projection 14a of the inlet member 14 corresponds to a male thread. Accordingly, when the second rotational member 60 is rotated about the central axis relative to the inlet member 14, the second rotational member 60 advances or retreats along the direction of rotation. An annular concave portion 18a is provided on the outer circumferential surface of the slider 18 . An annular elastic member 65 fits into the annular concave portion 18a. The annular elastic member 65 is, for example, an O-ring.

The state shown in FIG. 10(A) is the rotation lock release state in which the rotation drive mechanism 22 is on, and the state shown in FIG. 10 (B) is the rotation lock state in which the rotation drive mechanism 22 is off. am. In the state shown in FIG. 10(A), the second rotating member 60 is positioned 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 protruding portion 14a cooperate to cause the second rotating member 60 to retreat. As the second rotational member 60 retracts, the annular elastic member 65 is pressed by the inclined surface 62 formed on the inner surface of the second rotational member 60 and retreats, as shown in FIG. 10(B). state shown. In detail, when the second rotating member 60 retreats, the slider 18 together with the annular elastic member 65, and consequently the chuck unit 20 and relay member 21 retreat by the distance D. . Since the rotor 30 is fitted to the rear end of the relay member 21, when the rotor 30 retreats, the state of the rotor 30 shown in FIG. Rotation of the rotor 30 is locked.

On the other hand, when the second rotating member 60 is rotated in the reverse direction, the cam groove 61 and the cam protruding portion 14a cooperate to advance the second rotating member 60. As the second rotational member 60 advances, the pressing of the annular elastic member 65 by the inclined surface 62 of the second rotational member 60 is released, and the state shown in FIG. 10(A) becomes As a result, when the rotor 30 moves forward, the state of the rotor 30 shown in FIG. 4(A) is obtained, and the rotation lock of the rotor 30 is released.

In the second rotational lock mechanism, the second rotational member (60) and the annular elastic member (65) convert rotational motion into linear motion, and the rotor (30) is pressed via the relay member (21). Alternatively, release of the pressure can be configured arbitrarily as much as possible. For example, the annular elastic member 65 and the slider 18 may be formed integrally. Further, in the second rotational lock mechanism, the second rotational member 60 is rotated and operated, but by sliding the fitting member fitted to the inlet member 14 along the axial direction, the annular elastic member 65), and furthermore, the rotor 30 may be moved forward or backward. In this case, the fitting member can be alternately switched between an advanced position for pressing the rotor 30 on the outer surface of the inlet member 14 and a retracted position for releasing the pressure on the rotor 30. You can do it.

Fig. 11 is a longitudinal sectional view of the third mechanical pencil 3. Compared to the first mechanical pencil 1, the third mechanical pencil 3 has a third rotation lock mechanism instead of the first rotation lock mechanism. The third rotational lock mechanism has a knock member 80, a knock rotator 90, and a pressure spring 99, and uses a knock mechanism of a writing instrument of a knock type or a knock mechanism. Therefore, a third rotation lock mechanism may be constituted by applying a projecting/retracting mechanism other than the projecting/retracting mechanism described later.

12 is a longitudinal sectional view of the rear end 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 . On the inner peripheral surface of the rear shaft 70, it has four first projections 71 and four second projections 72 extending in the axial direction and connecting to each other at the rear end. The first projections 71 and the second projections 72 are alternately arranged at equal intervals along the circumferential direction.

On the upper surface of each of the first projections 71, that is, the surface facing the central axis of the rear shaft 70, a cam surface 73 inclined in the circumferential direction with respect to a plane perpendicular to the front-back direction and facing forward is provided. . Therefore, in the first protrusion 71, the rear of the cam surface 73 is a thicker, that is, higher, protrusion. On the other hand, in the first projection 71, the front of the cam surface 73 is a projection that is thinner, that is, lower, and is the same height as the second projection 72. Front end surfaces 74 of the first protrusion 71 and the second protrusion 72 restrict the retraction of the rotary drive mechanism 22 . Each of the first projection 71 and the second projection 72 has a vertical wall surface 75 that is a regulating surface extending in the front-back direction. An abutment surface 76 is formed on the front end surface of the portion connecting the first protrusion 71 and the second protrusion 72, respectively. The cam surface (73) and the vertical wall surface (75) constitute an external cam (77).

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 cylindrical member with both ends open. On the outer circumferential surface of the front side of the knock member 80, two projections 81 are provided in symmetrical positions. Further, between the two projections 81, a slit portion 82 extending from the front end surface of the knock member 24 toward the rear is provided. Each of the projections 81 is configured to move back and forth between the first projections 71 by a knock operation. That is, the diameter of the circumscribed circle that includes the outer surfaces of the two protrusions 81 is larger than the diameter of the inscribed circle contacting the upper surface of the first protrusion 71 of the rear shaft 70, and the second protrusion 72 of the rear shaft 70 ) is set smaller than the diameter of the inscribed circle tangent to the upper surface of A cam face 83 is formed on the front end face of the knock member 80 . The cam surface 83 has peaks 84 and valleys 85 formed symmetrically. Eight ridges 84 and valleys 85 are connected by inclined surfaces 86 .

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 open ends. The knock rotor 90 has a large diameter portion 90a and a small diameter portion formed behind the large diameter portion 90a and inserted into the knock member 80 to be used for seam fitting. It has a subsection (90b). The large-diameter portion 90a has a larger diameter than the small-diameter portion 90b. On the outer circumferential surface of the large-diameter portion 90a, four longitudinal grooves 91 are formed that are arranged at equal intervals along the circumferential direction and extend along the front-back direction. The depth of the vertical groove 91 is smaller than the difference in radius between the large-diameter portion 90a and the small-diameter portion 90b. In the large-diameter portion 90a, an inner cam 92 composed of four projections 92a formed by four longitudinal grooves 91 is formed. At the rear end surface of the large-diameter portion 90a, a cam receiving surface 93 cooperating with the cam surface 83 of the knock member 80 is formed complementary to the cam surface 83 of the knock member 80 over the entire circumference radially inside of the inner cam 92. ) is formed. That is, the internal cam 92 and the cam receiving surface 93 are integrally provided in the large-diameter portion 90a.

The cam receiving surface 93 is formed in the shape of a saw blade, and has an inclined surface 94 inclined in the circumferential direction with respect to a plane perpendicular to the front-back direction. In the eight inclined surfaces 94, every other inclined surface 94a is cut by the vertical groove 91 described above. The inclined surfaces 94 adjacent to the adjacent vertical grooves 91 are connected by vertical wall surfaces 95 extending along the front-back 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 complementary, the part of the vertical groove 91, the inclined surface 94 and the vertical wall surface ( An inclined surface 94b inclined in the opposite direction to the inclined surface 94 is provided in the acute angle portion formed by 95). The inclined surface 94b is provided with a height sufficient to cooperate with the cam surface 83 of the knock member 80, that is, a length in the radial direction.

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

The inner cam 92 engages or disengages from the outer cam 77 when the knock rotor 90 rotates around the central axis by a knock operation. That is, the protrusion 92a of the inner cam 92 engages with the first protrusion 71 of the outer cam 77 or the outer cam when the knock rotor 90 rotates around the central axis by a knock operation. It is disposed between the first projections 71 of (77). When the protrusion 92a of the inner cam 92 is disposed between the first protrusions 71 of the outer cam 77, the first protrusion 71 of the outer cam 77 is the protrusion of the inner cam 92 ( 92a), that is, within the flutes 91.

The cam face 83 of the knock member 80 and the cam receiving face 93 of the knock rotator 90, when the inner cam 92 is engaged or disengaged from the outer cam 77, knock member 80 The ridge portion 84 of the cam surface 83 of ) is configured to be located on the inclined surface 94 of the cam receiving surface 93 of the inner cam 92 in the circumferential direction. That is, the inclined surface 86 of the cam surface 83 and the inclined surface 94 of the cam receiving surface 93 are disposed out of phase. For this reason, when the inclined surface 86 of the cam surface 83 presses the inclined surface 94 of the cam receiving surface 93 by knocking operation, the operation load and the urging force by the pressure spring 99 result in knocking. The former 90 rotates around the central axis by receiving a component force in the circumferential direction. On the other hand, the rotation of the knock member 80 around the central axis is restricted by the projection 81 abutting against the vertical wall surface 75 of the outer cam 77 in the circumferential direction. These operations will be described with reference to FIG. 15 .

FIG. 15 is a schematic diagram explaining the operation of the third rotational lock mechanism, that is, the operation of the retracting mechanism, and is a schematic diagram showing the relationship between the respective cams of the third mechanical pencil 3. As shown in FIG. That is, FIG. 15 is a schematic diagram showing the positional relationship among the outer cam 77 of the rear shaft 70, the knock member 80, and the knock rotor 90. More specifically, positions of the cam surface 83 of the knock member 80 and the cam receiving surface 93 of the knock rotor 90 are shown when the outer cam 77 is developed 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. 16 is a longitudinal sectional view explaining the operation of the third rotation lock mechanism.

The operation of the third rotational lock mechanism is performed by carrying out a knocking operation to press the knock member 80 or the knock cover 15 forward, similar to the protruding/retracting mechanism of a knock-type writing instrument. Then, in the writing state in the knock-type writing instrument, that is, in the state shown in FIG. 16(B) in which the knock rotator 90 is in the forward locked state, the rotary driving mechanism is turned off. On the other hand, in the non-writing state in the knock-type writing instrument, that is, in the state in which the knock rotor 90 is located at the rear, the rotation lock release state shown in FIG. . The knock rotor 90 is given rotational force by the cam mechanism of the cam surface 83 of the knock member 80 and the cam receiving surface 93 of the knock rotor 90, and each knock operation is performed from the left in FIG. 15 move right

The state shown in FIG. 15(A) is the same state as that of FIG. 16(A). In the state shown in FIG. 15(A), the inner cam 92 is not engaged with the outer cam 77. That is, the protrusion 92a of the inner cam 92 is disposed between the first protrusion 71 of the outer cam 77, and the first protrusion 71 of the outer cam 77 is the protrusion of the inner cam 92. It is disposed between (92a), that is, within the longitudinal groove (91). The cam surface 83 and the cam receiving surface 93 are disposed out of phase.

From this state, when the knock member 80 is pressed against the urging force of the bias spring 99 to advance the knock member 80 and the knock rotor 90, as shown in FIG. 15(B) , the rear end of the longitudinal groove 91 of the cam receiving surface 93 of the inner cam 92 exceeds the front end of the first projection 71 of the outer cam 77 in the front-back direction. At this time, the inclined surface 94 of the cam receiving surface 93 of the knock rotor 90 coincides with the cam surface 73 of the outer cam 77, and the vertical wall surface of the first projection 71 of the outer cam 77. The restriction of rotation of the knock rotor 90 around the central axis by (75) is released.

When the pressing of the knock member 80 is released from the state shown in FIG. 15(B), the knock member 80 and the knock rotor 90 retreat by the biasing force of the bias spring 99. At this time, rotation of the knock rotor (90) around the central axis is not restricted by the vertical wall surface (75) of the first projection (71) of the outer cam (77). Therefore, the inclined surface 94 of the cam receiving surface 93 of the knock rotor 90 moves toward the cam surface 73 of the outer cam 77 or the cam surface of the knock member 80 by the biasing force of the bias spring 99. When the inclined surface 86 of 83 is pressed, the knock rotor 90 receives component force in the circumferential direction and rotates around the central axis.

The retraction and rotation of the knock rotor 90 is regulated by the engagement of the inner cam 92 with the outer cam 77. That is, the inclined surface 94 and the vertical wall surface 95 of the cam receiving surface 93 of the inner cam 92 are aligned with the cam surface 73 and the vertical wall surface 75 of the first protrusion 71 of the outer cam 77. By engaging with , the retreat and rotation of the knock rotor 90 are restricted, resulting in a state shown in FIG. 15(C).

The state shown in FIG. 15(C) is the same state as that of FIG. 16(B). From this state, when the knock member 80 is pressed against the urging force of the bias spring 99 and the knock member 80 and the knock rotor 90 are advanced, as shown in FIG. 15(D) , the rear end of the vertical wall surface 95 of the cam receiving surface 93 of the inner cam 92 exceeds the front end of the first projection 71 of the outer cam 77 in the front-back direction. At this time, the inclined surface 94 of the cam receiving surface 93 of the knock rotor 90 coincides with the cam surface 73 of the outer cam 77, and the vertical wall surface of the first projection 71 of the outer cam 77. The restriction of rotation of the knock rotor 90 around the central axis by (75) is released.

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 retreat by the biasing force of the bias spring 99. At this time, rotation of the knock rotor (90) around the central axis is not restricted by the vertical wall surface (75) of the first projection (71) of the outer cam (77). Therefore, the inclined surface 94 of the cam receiving surface 93 of the knock rotor 90 moves toward the cam surface 73 of the outer cam 77 or the cam surface of the knock member 80 by the biasing force of the bias spring 99. When the inclined surface 86 of 83 is pressed, the knock rotor 90 receives component force in the circumferential direction and rotates around the central axis.

Since the knock rotor 90 retracts while rotating, the projection 92a of the inner cam 92 is between the first projection 71 of the outer cam 77, as shown in FIG. The first protrusion 71 of the outer cam 77 is disposed between the protrusions 92a of the inner cam 92, that is, in the longitudinal groove 91. As a result, the engagement of the outer cam 77 and the inner cam 92 is released. When the projection 81 abuts against the vertical wall surface 75 of the outer cam 77 in the circumferential direction, rotation of the knock member 80 around the central axis is always restricted. From the state shown in FIG. 15(E), the knock member 80 and the knock rotor 90 are retracted as they are, and again come to the state shown in FIG. 15(A).

In the rotation locked state shown in FIG. 16(B), the knock rotor 90 advances, thereby compressing the bias spring 99 more. One end of the pressure spring 99 abuts on the knock rotor 90, and the other end of the pressure spring 99 abuts on the rear end surface of the rotary driving mechanism 22. Accordingly, the rotation driving mechanism 22 is in the state shown in FIG. 16(A) by balancing the forward biasing force increased by the compression of the bias spring 99 and the rearward biasing force of the axial spring 26. Compared to , it is moving forward by a distance D.

When the rotation drive mechanism 22 advances, there is a small clearance existing between each member in the barrel 11, for example, between the inlet member 14, the chuck unit 20, the relay member 21, and the like. The existing clearance is lost. As a result, the rotor 30 is in a relatively retracted state in the rotation drive mechanism 22, and the state of the rotor 30 shown in FIG. rotation is locked.

In the third mechanical pencil 3, the user can perform two knock operations: a rotary lock knock operation for turning the rotary drive mechanism 22 on or off, and an extraction knock operation for drawing out the writing lead. That is, when it is desired to turn on or off the rotary drive mechanism 22, as described with reference to FIG. 15, the knock member ( 80), and further advances the knock rotor 90. On the other hand, the knocking operation for drawing out the lead advances the knock member 80 and consequently the chuck unit 20 to the extent that the chuck unit 20 operates. That is, the rotary lock knock operation needs to be knocked deeper than the draw-out knock operation. In addition, drawing-out of a writing lead is performed also in rotation lock knock operation.

Fig. 17 is a longitudinal sectional view explaining the operation of the fourth rotational lock mechanism. The fourth rotation lock mechanism has a spacer 100 in addition to the structure of the third rotation lock mechanism. The spacer 100 is disposed in front of the rotor 30 . Specifically, it is arranged so as to fit the outer circumferential surface of the relay member 21 at the rear end of the front shaft 12 . When the knock rotor 90 and hence the rotary drive mechanism 22 move forward by the knocking operation, the front end surface of the rotor 30 abuts against the rear end surface of the spacer 100, and the rotor 30 advance is regulated. As a result, the state of the rotor 30 shown in FIG. 4(C) is obtained, and the rotation of the rotor 30 is locked.

Since the spacer 100 directly presses the rotor 30 because the fourth rotation lock mechanism has the spacer 100 in addition to the third rotation lock mechanism, the rotation of the rotor 30 is more reliable. Rotation can be locked.

[0003] By the way, a writing instrument equipped with a rotary drawing mechanism in which a refill emerges and retracts by rotating a part of the barrel, that is, a front shaft or a rear shaft around a central axis, is generally known. Next, a rotation lock mechanism using a novel rotation drawing mechanism will be described. Before that, first, the configuration will be described using a ballpoint pen equipped with this novel rotary drawing mechanism.

Fig. 18 is a longitudinal sectional view of the first ballpoint pen 5 in a non-writing state. The 1st ballpoint pen 5 has the barrel 11 formed in the shape of a cylinder. The barrel 11 is formed in a tubular shape provided at the front axle 12, the rear axle 110 fitted or screwed to the rear end of the front axle 12, and the rear end of the rear axle 110. It has member 120. In addition, the first ballpoint pen 5 includes a refill 7, which is a writing body disposed in the barrel 11 and having a writing portion 6 at one end, a coil spring 8, and a spring supporting member ( 9) and the first sliding member 130.

In the axial direction of the first ballpoint pen 5, the side of the writing portion 6 is defined as the "front" side, and the side opposite to the writing portion 6 is defined as the "rear" side. In the 1st ballpoint pen 5, the refill 7 moves back and forth in the barrel 11 by operation of the 1st rotary drawing mechanism. At this time, a state in which the writing unit 6 protrudes from the barrel 11 is referred to as a writing state (FIG. 23), and a state in which the writing unit 6 is immersed in the barrel 11 is referred to as a non-writing state (Fig. 23). 18 and Fig. 22).

19 is a longitudinal sectional view of the rear end 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 circumferential surface of the rear portion of the rear shaft 110 along the circumferential direction. As shown in Fig. 24 described later, the annular projection 111 is not provided over the entire circumference. For example, on the inner circumferential surface of the rear shaft 110, a concave portion 112 is formed in place of the annular protrusion 111 at a portion along the circumferential direction, for example, at a portion of 1/4 of the entire circumference. . The concave portion 112 is provided with two small protrusions 113 slightly separated from both end portions of the annular protrusion 111 . As a result, two locking recesses 114 are formed between the annular projection 111 and the small projection 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 opposite concave portion 112 in the circumferential direction. . The two key projections 115 are provided adjacent to the annular projection 111 in the axial direction.

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 mounted around the central axis with respect to the rear shaft 110 . The third rotating member 120 has a cylindrical gripping portion 121 that the user grips when rotating. A clip 121a is provided on the outer circumferential surface of the gripping portion 121 . In front of the gripping portion 121, an insertion portion 122 formed with a smaller diameter and inserted into the rear shaft 110 is provided. The insertion portion 122 is provided with two cutouts 123 that are substantially rectangular and face each other from the front end toward the rear. Two cam arms 124 extending forward are formed by the two cutouts 123 . Front end faces of the two cam arms 124 are provided with cam faces 125 inclined in the same direction along the circumferential direction. A rectangular protrusion 126 extending forward is formed in a central portion of the front end face of the insertion portion 122 in one of the notches. 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.

21 is a perspective view of the first sliding member 130 of the first ballpoint pen 5. As shown in FIG. In Fig. 21, the upper side is the rear side of the first ballpoint pen 5. The first sliding member 130 has a sliding body portion 131 . The sliding body portion 131 is a tubular member with a closed rear end. On the outer circumferential surface of the sliding body portion 131, two cam projections 132 are provided. The two cam projections 132 are separated from each other by two key grooves 133 extending along the axial direction. The rear end surfaces of the two cam projections 132 are provided with cam receiving surfaces 134 inclined similarly to the cam surfaces 125 of the third rotating member 120 . In each of the cam receiving surfaces 134, the most forward portion is defined as a start end portion 134a, and the rearmost portion is defined as a terminal portion 134b.

In the barrel 11, the third rotating member 120 is inserted into the rear axle 110 from the rear. At this time, the two cam arms 124 are bent radially inward, and the annular protrusion 111 of the rear shaft 110 is disposed 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 serves as a rail, and the annular projection 111 is relatively moved within the sliding groove 128. can be moved In addition, since the annular protrusion 111 of the rear shaft 110 is disposed in the sliding groove 128 of the third rotating member 120, the third rotating member 120 is difficult to separate from the rear shaft 110. . The locking protrusion 127 of the third rotating member 120 is disposed within the concave portion 112 .

The first sliding member 130 is inserted from the front of the rear shaft 110 into the inside, and the rear end of the sliding main body 131 is inserted from the front of the third rotating member 120 into the inside. When the first sliding member 130 is inserted, the cam arm of the third rotating member 120 is disposed so that the key protrusion 115 of the rear shaft 110 is disposed within the key groove 133 of the first sliding member 130. 124 is guided by the cam receiving surface 134 of the first sliding member 130 . By disposing the key protrusion 115 in the key groove 133, the first sliding member 130 can move back and forth within the barrel 11 without rotating around the central axis. When the sliding main body 131 of the first sliding member 130 is inserted into the third rotating member 120, the two cam arms 124 cannot bend inward in the radial direction. As a result, it is possible to prevent the third rotating member 120 from being separated from the rear shaft 110 .

The first sliding member 130 is biased backward by the coil spring 8 . One end of the coil spring 8 abuts against 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 supporting member 9. Advancement of the spring support member 9 is restricted by the rear end face of the front shaft 12 . The refill 7 passes through the coil spring 8 and the spring supporting member 9 . The rear end of the refill 7 is inserted into the interior from the front opening of the sliding main body 131 and fitted therein, so that the refill 7 is integrally attached to the first sliding member 130 (FIG. 18). ).

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

In the non-writing state shown in FIG. 22, retraction of the first sliding member 130 by the coil spring 8 causes the cam arm 124 of the third rotating member 120 to move the rear shaft ( In a state in which rotation of the third rotating member 120 is regulated by abutting against the key protrusion 115 of 110 in the circumferential direction, the cam arm 124 is regulated by being engaged with the cam protrusion 132 . At this time, the cam surface 125 of the third rotating member 120 is disposed at the starting end 134a of the cam receiving surface 134 of the first sliding member 130 .

From this state, when the third rotating member 120 is rotated by gripping the gripping portion 121, the cam surface 125 of the third rotating member 120 and the cam receiving surface 134 of the first sliding member 130 By this cooperation, the force in the rotational direction applied to the third rotating member 120 is converted into a force for moving the first sliding member 130 forward. That is, in the cam surface 125 and the cam receiving surface 134, component force in the axial direction is received from inclined surfaces inclined in the same direction, and the first sliding member 130 moves forward against the biasing force of the coil spring 8. do. When the cam surface 125 of the third rotating member 120 moves from the cam receiving surface 134 of the first sliding member 130 to the end portion 134b, the forward movement of the first sliding member 130 is stopped. Thus, the first ballpoint pen 5 enters a 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 reverse direction, the first sliding member 130 retreats under the urging force of the coil spring 8. When the cam surface 125 of the third rotating member 120 moves from the cam receiving surface 134 of the first sliding member 130 to the starting end 134a, the retraction of the first sliding member 130 is stopped. Thus, 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 drawing mechanism. Specifically, FIG. 24 is a cross section including the locking protrusion 127 of the third rotating member 120 in the first ballpoint pen 5 . Fig. 24(A) shows the 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, (B) of FIG. 24 shows the first ballpoint pen 5 in the writing state corresponding to FIG. 23 with the third rotating member 120 rotated in the other direction.

As shown in FIG. 24(A) , one side of the cam arm 124 abuts against one side of the key protrusion 115 in the circumferential direction. In contrast, as shown in FIG. 24(B) , the one side of the cam arm 124 abuts against the other side of the key protrusion 115 in the circumferential direction. In each case, that is, when the cam arm 124 abuts on the key protrusion 115, the locking protrusion 127 of the third rotating member 120 fits into the locking concave portion 114 of the rear shaft 110. are doing In short, the locking protrusion 127 rides over the small protrusion 113 according 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, the locking concave portion 114 fits within As a result, the third rotating member 120 can be temporarily fixed, preventing the writing state or the non-writing state from being released unintentionally.

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

In short, the above-described first rotation drawing mechanism includes a shaft cylinder 11 provided with a locking portion therein, a third rotation member 120 provided rotatably around the central axis with respect to the rear shaft 110, and a third rotation member ( 120) and a first sliding member 130 cooperating with each other, the third rotating member 120 and the first sliding member 130, respectively, the third rotating member 120 and the first sliding member 130. A cam surface that cooperates with the other side is formed, and along the rotation direction of the third rotating member 120, the first sliding member 130 moves back and forth in the shaft cylinder 11 to move the third rotating member 120 to one side. When rotated, the first sliding member 130 advances until the third rotational member 120 is engaged with the locking portion, and when the third rotational member 120 is rotated in the other direction, the third rotational member 120 The first sliding member 130 retracts until it engages with the hooking portion.

Here, the locking portion has a first locking portion that stops the forward rotation of the third rotating member 120 and a second locking portion that stops the reverse rotation of the third rotating member 120 . The first locking portion is specifically the key protrusion 115, and the second locking portion is specifically the locking concave portion 114. The "forward direction" refers to the direction in which the user intends to rotate, and the "reverse direction" refers to the direction opposite to the direction in which the user intends to rotate. Further, the third rotating member 120 has a first engaged portion engaged with the first engaging portion and a second engaged portion engaged with the second engaging portion. The first engaged portion is specifically the cam arm 124, and the second engaged portion is specifically the engaging protrusion 127.

The cam surface 125 of the third rotational member 120 and the cam receiving surface 134 of the first sliding member 130 convert the rotational motion of the third rotational member 120 to the linear motion of the first sliding member 130. As long as it can be converted to , it can be configured arbitrarily. Therefore, a cam surface that cooperates with the other of the third rotation member 120 or the first sliding member 130 may be formed on at least one of the third rotation member 120 and the first sliding member 130 . In addition, each of the cam arm 124 of the third rotating member 120 and the corresponding cam protrusion 132 of the first sliding member 130 may be at least one, or may be three or more, and may have different numbers. do.

According to the above-described first rotation drawing mechanism, as described above, when the third rotational member 120 is rotated in one direction, the first sliding member 130 moves until the third rotational member 120 engages with the locking portion. When moving forward and rotating the third rotational member 120 in the other direction, the first sliding member 130 retreats until the third rotational member 120 engages with the locking portion. Therefore, it is possible to reliably draw out with a waste-free operation and structure. In addition, since it has a first locking portion for stopping the forward rotation of the third rotating member 120 and a second locking portion for stopping the reverse rotation of the third rotating member 120, the intended rotation is stopped and at the same time Since reverse rotation is also prevented, more reliable drawing-out is attained.

In addition, the cam surface, which is a mechanism for converting rotational motion into linear 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 stopping rotation The locking parts, that is, the locking concave portion 114, the key projection 115, the cam arm 124, and the locking projection 127 are spaced apart from each other, specifically, are disposed apart from each other in the axial direction. Therefore, since it is possible to independently design and arrange separate mechanisms for converting motion and stopping rotation, more free design is possible according to the above-described first rotation drawing mechanism. For example, by changing the inclination angles of the cam surface 125 of the third rotating member 120 and the cam receiving surface 134 of the first sliding member 130, the amount of straight movement relative to the amount of rotation can be easily adjusted. can be adjusted Further, according to the above-described first rotary drawing mechanism, the rotary drawing mechanism can be realized with a smaller number of parts than the conventional rotary drawing mechanism, and molding or processing of parts can be performed easily.

Since the rotation of the third rotating member 120 is restricted by the side surface of the cam arm 124 abutting against the side surface of the key protrusion 115 of the rear shaft 110, the third rotating member 120 is subjected to excessive force. Even if you try to rotate it, you can reliably regulate the rotation. Further, since the mechanism for regulating rotation is separated from the conversion mechanism for converting rotational motion into linear motion and the locking mechanism for stopping rotation, the conversion mechanism and locking mechanism are not damaged by excessive force.

The above-described first rotary drawing mechanism can be widely applied to the overall applicator. That is, the applicator includes the above-described first rotary drawing mechanism and the coating body, and the coating body moves forward and backward together with the sliding member. Here, "applicator" refers to applicators such as correction fluid, adhesives, and chemicals, and applicators for cosmetics such as mascara, eyeliner, lipstick, and nail polish, as well as ballpoint pens, marker pens, marker pens, mechanical pencils, fountain pens, and thermal discoloration. Writing instruments such as castle writing instruments are also widely included. In addition, the "applicator" broadly includes, for example, a writing object such as a refill for a ballpoint pen, an ink container for eyeliner, and the like, depending on the applicator described above.

A refill as a writing body in a thermochromic writing instrument may contain thermochromic ink. In this case, the handwriting can be thermally discolored by the frictional heat generated when rubbed by the friction body as an erasing member. Here, the thermochromic ink maintains a predetermined color (first color) at room temperature (eg, 25 ° C.), and when the temperature is raised to a predetermined temperature (eg, 60 ° C.), a different color (second color) ), and then cooled to a predetermined temperature (for example, -5 ° C), it refers to an ink having a property of returning to the original color (first color) again. In a thermochromic writing instrument using thermochromic ink, making the second color colorless and heating the drawn lines written in the first color (for example, red) to make them colorless is referred to as "erasing" here. do. Therefore, the writing surface or the like on which the drawn lines are written is rubbed by the friction body as the erasing portion to generate frictional heat, whereby the drawn lines are changed to colorless, that is, erased. In addition, as a matter of course, the second color may be colored other than colorless.

Next, a rotation lock mechanism using the rotation drawing mechanism described above will be described. Fig. 25 is a longitudinal sectional view of the fourth mechanical pencil 4. Compared to the first mechanical pencil 1, the fourth mechanical pencil 4 has a fifth rotation lock mechanism instead of the first rotation lock mechanism, and a second rotation lock mechanism instead of the first rotation drawing mechanism. It has an ejection device. The 5th rotation lock mechanism has the 4th rotation member 150, the 2nd sliding member 160, and the pressure spring 169, and uses the above-mentioned rotation drawing mechanism. A fifth rotation lock mechanism may be constituted by applying another rotation drawing mechanism. The second rotational drawing mechanism of the fourth mechanical pencil 4 differs greatly from the first rotational drawing mechanism of the first ballpoint pen 5 only in the length of the sliding member.

26 is a longitudinal sectional view of the rear end 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 on the inner circumferential surface of the rear portion of the rear shaft 140 along the circumferential direction. As shown in FIG. 29 described later, the annular projection 141 is not provided over the entire circumference. For example, on the inner circumferential surface of the rear shaft 140, a concave portion 142 is formed in place of the annular protrusion 141 at a portion along the circumferential direction, for example, at a portion of 1/4 of the entire circumference. . The concave portion 142 is provided with two small protrusions 143 slightly separated from both end portions of the annular protrusion 141 . As a result, two locking recesses 144 are formed between the annular projection 141 and the small projection 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 opposite concave portion 142 in the circumferential direction. . The two key projections 145 are provided adjacent to the annular projection 141 in the axial direction.

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 mounted around the central axis with respect to the rear shaft 140 . The fourth rotating member 150 has a cylindrical gripping portion 151 that the user grips when rotating. A clip 151a is provided on the outer circumferential surface of the gripping portion 151 . In front of the gripping portion 151, an insertion portion 152 formed with a smaller diameter and inserted into the rear shaft 140 is provided. The insertion portion 152 is provided with two cutout portions 153 that are substantially rectangular and face each other from the front end toward the rear. Two cam arms 154 extending forward are formed by the two cutouts 153 . On the front end surfaces of the two cam arms 154, cam surfaces 125 inclined in the same direction along the circumferential direction are provided. A rectangular protrusion 156 extending forward is formed at the center of the front end surface of the insertion portion 152 in one of the notches. 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.

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 body portion 161 . Two cam protrusions 162 are provided on the outer circumferential surface of the sliding body portion 161 . The two cam projections 162 are separated from each other by two key grooves 163 extending along the axial direction. The rear end surfaces of the two cam projections 162 are provided with cam receiving surfaces 164 inclined similarly to the cam surfaces 155 of the fourth rotating member 150 . In each of the cam receiving surfaces 164, the frontmost portion is defined as the start end portion 164a, and the rearmost portion 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 shim case 23 is inserted into the through hole 165 .

In the barrel 11, the fourth rotating member 150 is inserted into the rear axle 140 from the rear. At this time, the two cam arms 154 are bent radially inward, and the annular protrusion 141 of the rear shaft 140 is disposed 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 serves as a rail, and the annular projection 141 is relatively moved within the sliding groove 158. can be moved In addition, since the annular protrusion 141 of the rear shaft 140 is disposed within the sliding groove 158 of the fourth rotational member 150, the fourth rotational member 150 is difficult to separate from the rear shaft 140. . The locking protrusion 157 of the fourth rotating member 150 is disposed within the concave portion 142 .

The second sliding member 160 is inserted from the front of the rear shaft 140 into the inside, and the rear end of the sliding body 161 is inserted from the front of the fourth rotational member 150 into the inside. When the second sliding member 160 is inserted, the cam arm of the fourth rotation member 150 is disposed so that the key protrusion 145 of the rear shaft 140 is disposed within the key groove 163 of the second sliding member 160. 154 is guided by the cam receiving surface 164 of the second sliding member 160 . By disposing the key protrusion 145 in the key groove 163, the second sliding member 160 can move back and forth within the barrel 11 without rotating around the central axis. When the sliding main body 131 of the second sliding member 160 is inserted into 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 being separated from the rear shaft 140 .

The second sliding member 160 is biased backward by the pressure spring 169 . One end of the pressure spring 169 abuts against a step provided inside the second sliding member 160 , and the other end of the pressure spring 169 is supported by the rear end surface of the rotary driving mechanism 22 . Retraction of the rotary driving mechanism 22 by the biasing force of the shaft spring 26 is restricted by the rear end surface of the rotary driving mechanism 22 abutting against the front end surface 146 of the key projection of the rear shaft 140 .

Fig. 29 is a cross-sectional view illustrating the operation of the second rotary drawing mechanism, and Fig. 30 is a longitudinal cross-sectional view illustrating the operation of the fifth rotary locking mechanism and the second rotary drawing mechanism. 29 is, specifically, a cross section including the locking protrusion 157 of the fourth rotating member 150 in the fourth mechanical pencil 4 . The state shown in FIG. 29(A) and FIG. 30(A) is a rotation lock release state in which the rotation driving mechanism 22 is ON, and the state shown in FIG. 29(B) and FIG. 30(B) is a rotation lock state in which the rotation drive mechanism 22 is off.

In the rotation lock released state shown in FIGS. 29(A) and 30(A) , retraction of the second sliding member 160 by the biasing spring 169, as described later, the fourth rotating member ( In a state where the cam arm 154 of 150 abuts against the key projection 145 of the rear shaft 140 in the circumferential direction and the rotation of the fourth rotating member 150 is regulated, the cam arm 154 moves along the cam projection. It is regulated by (162) and caught. At this time, the cam surface 155 of the fourth rotating member 150 is disposed at the starting end 164a of the cam receiving surface 164 of the second sliding member 160 .

From this state, when the fourth rotating member 150 is rotated by gripping the gripping portion 151, the cam surface 155 of the fourth rotating member 150 and the cam receiving surface 164 of the second sliding member 160 By this cooperation, the force in the rotational direction applied to the fourth rotation member 150 is converted into a force for moving the second sliding member 160 forward. That is, in the cam surface 155 and the cam receiving surface 164, component force in the axial direction is received from inclined surfaces inclined in the same direction, and the second sliding member 160 moves forward against the biasing force of the pressure spring 169. do. When the cam surface 155 of the fourth rotating member 150 moves from the cam receiving surface 164 of the second sliding member 160 to the end portion 164b, the forward movement of the second sliding member 160 is stopped. 29(B) and 30(B)).

In the rotationally locked state, the biasing spring 169 is further compressed as the second sliding member 160 moves forward. One end of the pressure spring 169 abuts against the second sliding member 160, and the other end of the pressure spring 169 abuts against the rear end surface of the rotary driving mechanism 22. Accordingly, the rotation driving mechanism 22 is in the state shown in FIG. 30(A) by balancing the forward biasing force increased by the compression of the biasing spring 169 and the rearward biasing force of the axial spring 26. Compared to , it is moving forward by a distance D.

When the rotation drive mechanism 22 advances, there is a small clearance existing between each member in the barrel 11, for example, between the inlet member 14, the chuck unit 20, the relay member 21, and the like. The existing clearance is lost. As a result, the rotor 30 is in a relatively retracted state in the rotation drive mechanism 22, and the state of the rotor 30 shown in FIG. rotation is locked.

On the other hand, in the rotation lock state, by rotating the fourth rotation member 150 in the reverse direction, the second sliding member 160 retreats under the urging force of the pressure spring 169 . When the cam surface 155 of the fourth rotating member 150 moves from the cam receiving surface 164 of the second sliding member 160 to the starting end 164a, the second sliding member 160 stops retracting. and the rotation drive mechanism 22 enters the rotation lock release state (Fig. 29(A) and Fig. 30(A)).

The rotation of the fourth rotating member 150 is regulated by the side surface of the cam arm 154 abutting against the side surface of the key protrusion 145 of the rear shaft 140 . That is, as shown in FIG. 29(A), one side of the cam arm 154 abuts against one side of the key projection 145 in the circumferential direction. In contrast, as shown in FIG. 29(B) , the above-mentioned one side of the cam arm 154 abuts against the other side 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 fits into the locking concave portion 144 of the rear shaft 140. are doing In short, the locking protrusion 157 rides over the small protrusion 143 according to the rotation of the fourth rotating member 150, and the cam arm 154 abuts on the key protrusion 145, and at the same time, the locking concave portion 144 fits within As a result, it is possible to temporarily fix the fourth rotational member 150, so that the rotation lock state or the rotation lock release state is prevented from being unintentionally released.

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

In addition, a second rotary drawing mechanism for advancing or retracting the second sliding member 160 by the rotation of the fourth rotating member 150, and a knocking operation for pressing the knock member 24 or the knock cover 15 forward As a result, the protruding/retracting mechanism for drawing out the writing lead can be operated independently. Therefore, in the fourth mechanical pencil 4, the knock operation can be performed even when the rotation drive mechanism is turned on or off by the fifth rotation lock mechanism.

Fig. 31 is a longitudinal sectional view explaining the operation of the sixth rotation lock mechanism; The sixth rotation lock mechanism has a spacer 100 in addition to the structure of the fifth rotation lock mechanism. The spacer 100 is disposed in front of the rotor 30 . Specifically, it is arranged so as to fit the outer circumferential surface of the relay member 21 at the rear end of the front shaft 12 . When the second sliding member 160 and, consequently, the rotation driving mechanism 22 move forward by the operation of the second rotary drawing mechanism, the front end face of the rotor 30 abuts against the rear end face of the spacer 100, , advancement of the rotor 30 is regulated. As a result, the state of the rotor 30 shown in FIG. 4(C) is obtained, and the rotation of the rotor 30 is locked.

Since the 6th rotation lock mechanism has the spacer 100 in addition to the 5th rotation lock mechanism, since the spacer 100 directly presses the rotor 30, the rotor 30 is more reliable Rotation can be locked.

Further, as long as the rotor is configured to be locked in a relatively retracted state in the rotation drive mechanism, the rotation lock mechanism can be configured arbitrarily. The rotation lock mechanism may be configured to push the rotor backward or press the rotation drive mechanism forward to cause the rotor to move relatively backward in the rotation drive mechanism. The rotor or rotation drive mechanism may be directly or indirectly pressed by the rotation lock mechanism. The rotation lock mechanism may have a rotating member with a cam, and the rotational motion of the rotating member may be converted into linear motion by the action of the cam so that the rotor is pressed.

As a matter of course, even in a state where the rotation lock mechanism locks the rotor, the writing lead can be drawn out 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 advancement or retraction of the chuck unit 20 by the knocking operation. Therefore, a mechanical pencil in a state where the rotation lock mechanism locks the rotor can be used in the same way as a normal mechanical pencil. For this reason, for example, in the case of shorthand writing, when it is felt that the advancement and retraction of the writing lead by the rotation drive mechanism is cumbersome, the rotation drive mechanism can be turned off. On the other hand, in the case of careful writing in which non-uniformity in handwriting thickness due to uneven wear of the writing lead is prevented, the rotation driving mechanism can be turned on. In short, the user can freely switch between on (activation or activation) and off (stopping or invalidation) of the rotary drive mechanism.

According to the second rotation lock mechanism, the rotor is pressed backward through the chuck unit, but the shim case may be pushed backward from the front or pulled from the rear to cause the shim case to be retracted. By retracting the shim case, the relay member 21 is retracted, and as a result, the rotor is retracted, so that the rotation drive mechanism 22 can be locked in rotation.

The rotational locking mechanism may have a protruding/retracting mechanism or a rotational drawing-out mechanism that presses the rotational drive mechanism forward. The protruding/retracting mechanism or the rotary drawing/out mechanism may have a spring and a sliding member that urges the spring, and may advance the sliding member to press the rotary driving mechanism forward. The protruding/retracting mechanism further has a knock member and a knock rotor disposed at the rear end of the barrel, and when a knock operation of the knock member is performed to advance the knock rotor to a predetermined position, the knock rotor rotates around the central axis, and the knock rotor rotates around the central axis. In addition to stopping the retraction of the electrons, the rotary driving mechanism may be advanced so that the rotor is locked in a relatively retracted state in the rotary driving mechanism.

1: first mechanical pencil 5: first ballpoint pen
8: coil spring 11: barrel
12: front axis 14: entrance 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: shim case 24: knock member
25: coil spring 26: axial spring
30: rotor 31: upper cam forming member
32: lower cam forming member 33: cylinder member
34: torque canceller 35: cushion spring
40: rear axis 41: regulatory protrusion
42: shear surface 43: through hole
44: inclined cam receiving surface 50: changeover switch
51: switch support part 52: switch part
54: first rotating member 55: cam body
56: opening 57: support plate
58: spacing 59: inclined cam surface
110: rear shaft 120: third rotating member
121: gripping part 122: insertion part
123: cutout 124: cam arm
125: cam surface 130: first sliding member
131: sliding body part 132: cam protrusion part
133: key groove 134: cam receiving surface

Claims (12)

The writing lead is released and gripped by the forward and backward movement of a chuck unit disposed in the barrel, so that the writing lead is drawn forward, and the chuck unit is rotatable around a central axis while holding the writing lead. As a mechanical pencil held in the barrel,
a rotation drive mechanism having a rotor and causing the rotor to retract in response to a retracting operation of the chuck unit by writing pressure applied to the writing lead, thereby causing rotational motion of the rotor; In the mechanical pencil configured to be delivered to the writing lead via a chuck unit,
The mechanical pencil, characterized in that it further comprises a rotation lock mechanism for locking the rotation of the rotor. The method of claim 1,
The mechanical pencil in which the rotational locking mechanism locks the rotor in a relatively retracted state in the rotational driving mechanism. The method of claim 2,
The mechanical pencil in which the rotation lock mechanism is configured to push the rotor backward or press the rotation drive mechanism forward to cause the rotor to move relatively backward in the rotation drive mechanism. The method of claim 3,
The mechanical pencil in which the rotor or the rotation drive mechanism is directly or indirectly pressed by the rotation lock mechanism. The method of claim 4,
The mechanical pencil according to claim 1 , wherein the rotating lock mechanism has a rotating member with a cam, and rotational motion of the rotating member is converted into linear motion by an action of the cam, so that the rotor is pressed. The method of claim 5,
A mechanical pencil in which the rotor is pressed backward through the chuck unit. According to claim 3 or claim 4,
The mechanical pencil wherein the rotational lock mechanism has a protruding/retracting mechanism or a rotational drawing mechanism that presses the rotational driving mechanism forward. The method of claim 7,
The mechanical pencil wherein the retracting mechanism or the rotary drawing mechanism has a spring and a sliding member that presses the spring, and advances the sliding member to press the rotary driving mechanism forward. According to claim 7 or claim 8,
The retracting mechanism further has a knock member and a knock rotor disposed at the rear end of the barrel,
When the knock operation of the knock member is performed to advance the knock rotor to a predetermined position, the knock rotor rotates around the central axis, the retraction of the knock rotor stops, and the rotation driving mechanism advances to rotate the knock rotor. A mechanical pencil that is locked in a relatively retracted state in the rotation driving mechanism. The method according to any one of claims 7 to 9,
A mechanical pencil in which the rotor is pressed backward through a spacer. The method according to any one of claims 1 to 10,
The mechanical pencil in which the writing lead is drawn out by moving the chuck unit back and forth in a state where the rotation lock mechanism locks the rotor. According to any one of claims 1 to 11,
The rotation drive mechanism has a first cam forming member and a second cam forming member,
The rotor is formed in a ring shape, a first cam surface and a second cam surface are formed on one end surface and the other end surface in the axial direction, respectively, and the first cam forming member so as to face the first cam surface and the second cam surface, respectively. and a first fixed cam surface and a second fixed cam surface formed on the second cam forming member are disposed;
By the retracting operation of the chuck unit by the writing pressure, the first cam surface of the rotor abuts and engages with the first fixed cam surface, and by release of the writing pressure, the second cam surface of the rotor The cam surface is configured to contact and engage with the second fixed cam surface,
In a state where the first cam face of the rotor is engaged with the first fixed cam face, the second cam face of the rotor and the second fixed cam face are formed by one tooth of the cam in the axial direction. ), and in a state where the second cam surface of the rotor is engaged with the second fixed cam surface, the first cam surface of the rotor and the first fixed cam surface are in an axial direction In, the phase is set in a relationship that is out of phase with respect to one tooth of the cam,
The mechanical pencil 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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