WO2019150828A1

WO2019150828A1 - Click-type writing instrument

Info

Publication number: WO2019150828A1
Application number: PCT/JP2018/047095
Authority: WO
Inventors: 聡住吉; 義春並木
Original assignee: 三菱鉛筆株式会社
Priority date: 2018-01-31
Filing date: 2018-12-20
Publication date: 2019-08-08
Also published as: CN111670124B; CN111670124A; JP2022137207A

Abstract

Provided is a click-type writing instrument with a simple structure which enables stable scratching movement and the like. A click-type writing instrument 1 is equipped with a shaft tube 4 and an operation part. With a clicking operation in which the operation part is pushed forward, a writing state and a non-writing state can be switched therebetween. The click-type writing instrument 1 is further equipped with a brake rod 90 that is movable inside the shaft tube 4 in the forward and backward direction with gravity, a click ring 100 that is movable with the operation part and rotatable around the central axis, and a locking part that is capable of locking the click ring 100. When the forward end of the shaft tube 4 is pointed upward, the brake rod 90 moves backward, the rotation of the click ring 100 is restricted, the click ring 100 is locked by the locking part, and thereby the forward movement of the operation part is inhibited.

Description

Knock-type writing instrument

The present invention relates to a knock-type writing instrument.

A knock-type writing instrument that has a knock-lock member that is movable in the axial direction in the axial direction by gravity and has a cylindrical shape is known (Patent Document 1). In the knock type writing instrument described in Patent Document 1, when the front end is in the upward state, the knocking member is locked, so that the operation portion disposed at the rear end portion of the shaft cylinder is prevented from moving forward. The operation is disabled. Therefore, a stable rubbing operation can be performed at the time of erasing the handwriting with the knock type writing instrument using the erasing member provided at the rear end portion of the operation unit. That is, even if the knocking writing instrument is changed and the erasing member is pressed against the writing surface to perform the rubbing operation, the erasing member will not rattle.

JP 2016-107615 A

In the knock type writing instrument described in Patent Document 1, the cylindrical knocking member moves in the front-rear direction over a predetermined distance in the vicinity of the inner peripheral surface of the shaft cylinder by gravity, so that the shape of the internal mechanism and the arrangement of the parts There are restrictions on location. In order to widen the design range of the internal mechanism, it is preferable that other mechanisms prevent the forward movement of the operation unit when the front end is in the upward state.

An object of the present invention is to provide a knock-type writing instrument having a simple mechanism that enables a stable rubbing operation and the like.

According to an aspect of the present invention, there is provided a knock type writing instrument that includes a shaft cylinder and an operation unit, and is capable of switching between a writing state and a non-writing state by performing a knocking operation that presses the operation unit forward. A brake member that can move in the longitudinal direction in the shaft cylinder by gravity, a rotating member that can move together with the operating portion and rotate about a central axis, and a locking portion that can be locked with the rotating member. Further, when the front end of the shaft cylinder is directed upward, the brake member moves rearward, the rotation of the rotating member is restricted, and the rotating member is locked with the locking portion, whereby the operation portion A knock-type writing instrument is provided that is prevented from moving forward.

The rotating member may be a cylindrical member. A protrusion may be provided on the inner surface of the rotating member, and the rotation of the rotating member may be restricted by the brake member inserted into the rotating member engaging with the protrusion. The rotating member has a first slope inclined in the circumferential direction with respect to a plane perpendicular to the front-rear direction, and the second locking part is inclined in the circumferential direction with respect to a plane perpendicular to the front-rear direction. The first inclined surface of the rotating member that has an inclined surface and whose rotation is restricted may be in contact with the second inclined surface of the locking portion, thereby preventing the operation portion from moving forward. . The first slope or the second slope may be larger than 45 degrees in an inclination angle with respect to the axial direction of the knock type writing instrument. A plurality of writing bodies; a sliding member to which each of the writing bodies is connected; and a first cam surface disposed in front of the sliding member and cooperating with each of the sliding members. In the state, at least one of the sliding members and the first cam surface may be separated from each other. All or part of the operation unit may be an erasing unit capable of erasing the handwriting of the knock type writing instrument. The erasing part may be a friction body having a polypropylene-based resin of 50 mass% or more and a tensile elastic modulus (JIS K 7161: 2014-1) of 70 MPa or more.

According to the aspect of the present invention, there is a common effect of providing a knock type writing instrument having a simple mechanism that enables a stable rubbing operation and the like.

It is a perspective view of the writing instrument by embodiment of this invention. It is a longitudinal cross-sectional view of the writing instrument which is a non-writing state and the front end faces downward. It is a longitudinal cross-sectional view of the writing instrument in the writing state and the front end facing downward. It is an enlarged vertical sectional view of a writing instrument whose front end is upward. It is a partial section perspective view of the rear part of a writing instrument. It is a perspective view of the rear part of the writing instrument of a non-writing state. It is a perspective view of the opposite side of the writing instrument of FIG. It is a longitudinal cross-sectional view of a rear axis. It is a longitudinal cross-sectional view of an inner cylinder. It is a perspective view of a spacer. It is a perspective view of a color. It is a rear view of a rotating cam. It is a perspective view of a sliding piece. It is a perspective view of an operation member. It is a perspective view of a rotor. It is a perspective view of a brake rod. It is a perspective view of a knock ring. It is a schematic diagram explaining operation | movement of a knock ring. It is a cross-sectional view explaining operation | movement of a brake rod. It is another schematic diagram explaining operation | movement of a knock ring. It is another schematic diagram explaining operation | movement of a knock ring. It is a schematic diagram explaining the operation | movement of the refill at the time of knock operation. It is a schematic diagram explaining the switching operation | movement of the refill which can appear and disappear. It is a schematic diagram explaining the operation | movement of the refill at the time of knock operation in another embodiment. It is a perspective view of the writing instrument by another embodiment of the present invention. It is a longitudinal cross-sectional view of a rear axis. It is a perspective view of a spacer. It is a schematic diagram explaining the operation | movement of the refill at the time of knock operation.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Corresponding components are denoted by common reference symbols throughout the drawings.

FIG. 1 is a perspective view of a writing instrument 1 according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional view of the writing instrument 1 in a non-writing state and the front end is downward, and FIG. 3 is a writing state and the front end is 4 is a longitudinal sectional view of the writing instrument 1 facing downward, FIG. 4 is an enlarged longitudinal sectional view of the writing instrument 1 with the front end facing upward, FIG. 5 is a partial sectional perspective view of the rear part of the writing instrument 1, and FIG. FIG. 7 is a perspective view of the rear portion of the writing instrument 1 in a writing state, and FIG. 7 is a perspective view of the opposite side of the writing instrument 1 of FIG.

The writing instrument 1 is formed in a cylindrical shape and includes a shaft cylinder 4 provided with a front shaft 2 and a rear shaft 3, and a plurality of refills 5 that are arranged in the shaft tube 4 and are provided with a writing portion 5 a at one end. have. The front shaft 2 and the rear shaft 3 may be integrally formed. 6 and 7, the rear shaft 3 is omitted.

In the present specification, in the axial direction of the writing instrument 1, the writing part 5a side is defined as the “front” side, and the opposite side of the writing part 5a is defined as the “rear” side. Unless otherwise stated, the central axis or axial direction refers to the central axis or axial direction of the writing instrument 1.

The writing instrument 1 is a knock-type writing instrument in which the refill 5 appears and disappears from the shaft cylinder 4 by a knocking operation that presses the operation unit forward. The writing instrument 1 is also a multi-core writing instrument having a plurality of refills 5.

The writing instrument 1 has an inner cylinder 20 attached to the rear end of the rear shaft 3 and provided with a clip 28. The inner cylinder 20 may also be referred to as the shaft cylinder 4. The writing instrument 1 includes a spacer 30, a collar member 40 disposed around the spacer 30, a rotating cam 50 disposed behind the collar member 40, the inner cylinder 20, and the collar member 40 in the shaft cylinder 4. A sliding piece 60 that is a plurality of sliding members disposed therebetween, an operation member 70 disposed behind the spacer 30, a rotor 80 disposed around the operation member 70, and the inside of the operation member 70 And a knock ring 100 disposed around the operation member 70 at the rear of the rotor 80.

The erasing member 7 is attached to the rear end portion of the operation member 70 via the holding member 6. A cover member 8 is detachably attached to the holding member 6, and the erasing member 7 is covered with the cover member 8. The erasing member 7 is provided integrally with the holding member 6 by bonding or two-color molding. The erasing member 7 may be detachable from the holding member 6, or a part of the holding member 6 may function as an erasing member. By pressing the cover member 8 in the attached state or the erasing member 7 forward when the cover member 8 is removed, the operation member 70 moves forward, and a knocking operation is performed. In other words, the rear end of the writing instrument 1, that is, the erasing member 7 or the cover member 8 functions as an operation unit for knocking operation. Note that all or part of the operation unit may be an erasing unit that can erase the handwriting of the writing instrument 1. 4 and 5, the cover member 8 is omitted.

The holding member 6 is urged rearward by the rear spring 10. Therefore, regardless of whether the writing instrument 1 is in a writing state or a non-writing state, the holding member 6, the erasing member 7, and the cover member 8 are always arranged at the same position in the axial direction. The rear spring 10 may be omitted. A front spring 11 is disposed in front of the collar member 40, and the collar member 40 is urged rearward by the front spring 11. An annular display member 12 is disposed between the front shaft 2 and the rear shaft 3. On the outer surface of the display member 12, there are provided two triangular marks that point in opposite directions in the circumferential direction.

2 to 4, the upper part is vertically upward, and the lower part is vertically downward. That is, gravity acts downward in each figure. As will be described later, the brake rod 90 is movable in the longitudinal direction in the shaft cylinder 4 by gravity. Therefore, in FIG. 2 and FIG. 3, the front end of the writing instrument 1, that is, the front end of the shaft cylinder 4 faces downward, so the brake rod 90 is close to the front end side in the shaft cylinder 4. On the other hand, in FIG. 4, since the front end of the writing instrument 1 is upward, the brake rod 90 is closer to the rear end side in the shaft cylinder 4 than in FIGS. 2 and 3.

The configuration of main parts will be described with reference to FIGS. 1 to 7 as appropriate.

FIG. 8 is a longitudinal sectional view of the rear shaft 3. In the assembled state of the writing instrument 1, the rear shaft 3 is arranged so that the upper side is the rear side of the writing instrument 1 in FIG. On the inner peripheral surface of the rear shaft 3, two substantially T-shaped protrusions 13 are provided as locking portions. The two T-shaped protrusions 13 are arranged apart from each other by 120 degrees around the central axis. A plurality of annular grooves 14 spaced apart in the axial direction are formed on the inner peripheral surface of the front end portion of the rear shaft 3. Note that the T-shaped protrusion 13 is not provided on the inner peripheral surface of the rear shaft 3 but may be provided as a separate member, for example.

FIG. 9 is a longitudinal sectional view of the inner cylinder 20. In the assembled state of the writing instrument 1, the inner cylinder 20 is arranged so that the upper side is the rear side of the writing instrument 1 in FIG. 9. The inner cylinder 20 is attached to the rear end portion of the rear shaft 3 by fitting or press-fitting. A stepped portion 21 facing rearward is formed on the inner peripheral surface of the inner cylinder 20. Six first inner protrusions 22 extending in the axial direction are provided at equal intervals along the circumferential direction on the inner circumferential surface of the inner cylinder 20 in front of the stepped portion 21. A slope 22 a that is inclined in the circumferential direction is formed on the front end face of each first inner protrusion 22. The six first inner protrusions 22 constitute a first outer cam 23. A second inner protrusion 24 that protrudes further than the first inner protrusion 22 is formed as a locking portion at the rear end of each of the first inner protrusions 22. A slope 24a inclined in the circumferential direction is formed on the rear end surface of each second inner protrusion 24, and a partial slope 24b (described later) is formed on a part of the front end face of each second inner protrusion 24. 18A) is formed. The six second inner protrusions 24 constitute a second outer cam 25. At the front end portion of the inner cylinder 20, a concave portion 26 cut out in a rectangular shape is formed.

FIG. 10 is a perspective view of the spacer 30. In the assembled state of the writing instrument 1, the spacer 30 is arranged so that the upper side is the rear side of the writing instrument 1 in FIG. 10. The spacer 30 includes a cylindrical main body 31, three rail portions 32 extending rearward from the rear end portion of the main body portion 31, and a connection formed to connect the rear end portions of the three rail portions 32. Part 33. The connecting portion 33 has two connecting portion pieces 33a whose outer periphery is formed to be smaller than the outer diameter of the three rail portions 32, and is formed as an extension of the rail portion 32 or has a larger diameter than the connecting portion piece 33a. Two rotation restricting pieces 33b. The adjacent two rail portions 32 and the connecting portion 33 define three grooves into which the refill 5 can be inserted. That is, in the present embodiment, the writing instrument 1 can accommodate three refills 5. A flange portion 34 is formed on the outer peripheral surface of the main body portion 31, and the outer peripheral surface of the main body portion 31 is divided into front and rear portions by the flange portion 34. On the front end surface of the flange portion 34, a projecting mark portion 35 extending forward is formed. The mark part 35 fits into the recessed part of the display member 12 (FIG. 1). A male screw part 36 is formed in the front part of the main body part 31, and the spacer 30 is screwed to the front shaft 2 by the male screw part 36. A plurality of annular protrusions 37 that are spaced apart in the axial direction are formed at the rear of the main body 31.

FIG. 11 is a perspective view of the collar member 40. In the assembled state of the writing instrument 1, the color member 40 is arranged so that the upper side is the rear side of the writing instrument 1 in FIG. 11. The collar member 40 is formed in a cylindrical shape as a whole. Two T-shaped concave portions 41 are formed on the outer peripheral surface of the collar member 40 at positions corresponding to the T-shaped projections 13 of the rear shaft 3 and in a complementary shape. A portion of the rear end surface corresponding to the space between the two T-shaped concave portions 41 is formed with a raised portion 42 that is raised in a stepped manner. A part of the rear end surface of the collar member 40 is formed with a cutout portion 43 that is cut obliquely from the rear end side toward the front (FIG. 7). The rear end surface of the collar member 40 including the end surface of the notch 43 constitutes a first cam surface 44.

FIG. 12 is a rear view of the rotary cam 50. In the assembled state of the writing instrument 1, the rotating cam 50 is arranged so that the upper side is the rear side of the writing instrument 1 in FIG. 12. The rotating cam 50 has an annular portion 51 formed in an annular shape around the central axis, and a claw-shaped claw portion 52. The annular portion 51 is formed so as to be attached to the inner surface of the rear end portion of the claw portion 52. A protruding guide protrusion 53 is formed on the inner surface of the claw portion 52 so as to extend forward from the front end surface of the annular portion 51. As shown in FIG. 7, the outer shape of the rear portion of the claw portion 52 is formed in a rectangular shape that is complementary to the concave portion 26 of the inner cylinder 20. Therefore, in the writing instrument 1 in a non-writing state, the claw portion 52 is fitted into the concave portion 26 of the inner cylinder 20, and the outer surface of the rotating cam 50 is flush with the outer peripheral surface of the inner cylinder 20. Further, the outer diameter of the annular portion 51 is formed slightly smaller than the inner diameter of the inner cylinder 20. The front part of the nail | claw part 52 has the flat surface 54 formed flat, and the end surface 55 formed diagonally. The flat surface 54 and the end surface 55 of the claw portion 52 constitute a second cam surface 56 together with the front end surface 27 (FIG. 9) of the inner cylinder 20.

FIG. 13 is a perspective view of the sliding piece 60. In the assembled state of the writing instrument 1, the sliding piece 60 is arranged so that the upper side is the rear side of the writing instrument 1 in FIG. 13. The sliding piece 60 has an insertion portion 61 inserted into the rear end portion of the refill 5 and a slider 62 formed on the side surface of the insertion portion 61. Since the slider 62 slides along the first cam surface 44 as will be described later, a minute projection 63 is formed on the front end surface of the slider 62 so as to reduce the frictional resistance during sliding. . Since the slider 62 slides along the second cam surface 56, the same minute protrusion may be formed on the rear end surface of the slider 62.

FIG. 14 is a perspective view of the operation member 70. In the assembled state of the writing instrument 1, the operation member 70 is arranged such that the upper side is the rear side of the writing instrument 1 in FIG. 14. The operation member 70 is a hollow member having a front end opened and a rear end closed. A cam flange 71 is formed on the outer peripheral surface of the operation member 70. On the front end surface of the cam flange 71, a rotating cam surface 72 composed of symmetrical and continuous peaks and valleys is formed. On the outer peripheral surface of the cam flange 71, six guide grooves 73 extending in the axial direction are formed at equal intervals along the circumferential direction. Two rectangular through-holes 74 extending in the axial direction are formed on the outer peripheral surface of the operation member 70 behind the cam flange 71 and spaced apart by 180 degrees around the central axis. On the outer peripheral surface of the operation member 70, a stepped portion 75 facing rearward is formed behind the through hole 74, and a fitting protrusion 76 is formed behind the stepped portion 75. When the holding member 6 is attached to the rear end portion of the operation member 70, the fitting protrusion 76 is fitted into the opening provided in the holding member 6.

FIG. 15 is a perspective view of the rotor 80. In the assembled state of the writing instrument 1, the rotor 80 is arranged so that the upper side is the rear side of the writing instrument 1 in FIG. 15. The rotor 80 is a cylindrical member. On the rear end surface of the rotor 80, a rotating cam receiving surface 81 formed in a complementary manner with the rotating cam surface 72 of the operation member 70 is formed. The rotating cam receiving surface 81 cooperates with the rotating cam surface 72 of the operation member 70. Six protrusions 82 extending in the axial direction and arranged at equal intervals along the circumferential direction are formed on the outer peripheral surface of the rotor 80, and the rear end surface of the protrusion 82 constitutes a first inner cam 83. Six adjacent locking grooves 84 extending in the front-rear direction are defined by two adjacent protrusions 82. A locking portion 85 is formed on each rear end surface of the protrusion 82.

FIG. 16 is a perspective view of the brake rod 90. In the assembled state of the writing instrument 1, the brake rod 90 is arranged so that the upper side is the rear side of the writing instrument 1 in FIG. 16. The brake rod 90 is a solid member. A small diameter portion 91 is formed at the rear end portion of the brake rod 90, and a large diameter portion 92 having a larger diameter is formed in front of the small diameter portion 91. The small diameter portion 91 and the large diameter portion 92 are connected by a tapered surface 93. On the outer peripheral surface of the large-diameter portion 92, two rectangular protrusions 94 that are spaced apart by 180 degrees around the central axis line and extend in the axial direction are formed, and a part of the rear part of the protrusion 94 is cut out into a rectangular shape. A regulation unit 95 is defined.

FIG. 17 is a perspective view of the knock ring 100. In the assembled state of the writing instrument 1, the knock ring 100 is arranged so that the upper side is the rear side of the writing instrument 1 in FIG. 17. The knock ring 100 is a cylindrical member. On the inner peripheral surface of the knock ring 100, two restricting protrusions 101 extending in the axial direction are formed apart from each other by 180 degrees around the central axis. On the outer peripheral surface of the front end portion of the knock ring 100, four first outer protrusions 102 having a right triangle shape are formed. The two first outer protrusions 102 are arranged 60 degrees apart around the central axis, and the other two corresponding first outer protrusions 102 are arranged 180 degrees apart from each other around the central axis. . A parallelogram-shaped second outer protrusion 103 is formed behind each of the first outer protrusions 102. The first outer protrusion 102 and the second outer protrusion 103 constitute a second inner cam 104.

Next, the combination and arrangement of each component in the writing instrument 1 will be described with reference to FIGS.

The spacer 30 is screwed with the front shaft 2 by a male screw portion 36. The front end portion of the rear shaft 3 is inserted into the rear portion of the main body portion 31 of the spacer 30. At this time, each of the annular protrusions 37 of the spacer 30 is fitted into the corresponding annular groove 14 of the rear shaft 3, so that the rear shaft 3 does not easily come out of the spacer 30 and thus the front shaft 2. It is connected so that it can rotate. The front spring 11 and the collar member 40 are disposed around the rail portion 32 of the spacer 30. The front end of the front spring 11 is supported by the rear end surface of the main body 31 of the spacer 30, and the rear end of the front spring 11 is in contact with the front end surface of the collar member 40. The collar member 40 is movable in the front-rear direction and is urged rearward by the front spring 11. Each of the T-shaped protrusions 13 of the rear shaft 3 is accommodated in the T-shaped recess 41 of the corresponding collar member 40, so that the rotation of the collar member 40 around the central axis is restricted. Therefore, when the rear shaft 3 is rotated with respect to the front shaft 2, the collar member 40 rotates together with the rear shaft 3.

The refill 5 and the sliding piece 60 are connected by inserting the insertion portion 61 of the sliding piece 60 into the rear end of each of the three refills 5. In this state, each of the refills 5 is inserted into a groove between the rail portions 32 of the spacer 30 and is movable in the front-rear direction. At this time, the slider 62 of the sliding piece 60 protrudes radially outward from the rail portion 32 of the spacer 30. The slider 62 is locked to the edge portion of the rail portion 32 to prevent the refill 5 from falling off between the rail portions 32. The slider 62, in particular, the minute protrusion 63 of the slider 62 is in contact with the first cam surface 44 of the collar member 40. At this time, one of the sliders 62 of the three sliding pieces 60 is disposed on the first cam surface 44 of the notch 43 of the collar member 40, and the remaining sliders 62 are arranged on the collar member 40. It arrange | positions at the 1st cam surface 44 of a rear-end surface.

Since the collar member 40 is urged rearward by the front spring 11, each of the sliding pieces 60 is also urged rearward via the collar member 40, and further, the rotating cam 50 via the sliding piece 60. Is also urged backwards. The rearward movement of the collar member 40, and consequently the sliding piece 60, is restricted by the rear end surface of the slider 62 coming into contact with the second cam surface 56 of the rotating cam 50 including the front end surface 27 of the inner cylinder 20. The Accordingly, each of the sliders 62 of the sliding piece 60 is disposed between the first cam surface 44 and the second cam surface 56. The claw portion 52 of the rotating cam 50 is movable in the front-rear direction within the recess 26 of the inner cylinder 20. At this time, the annular portion 51 of the rotating cam 50 slides along the inner peripheral surface of the inner cylinder 20.

The operating member 70 is disposed in the shaft tube 4 so that each of the first inner protrusions 22 of the inner tube 20 is disposed in the corresponding guide groove 73. Thereby, during the knocking operation, the operation member 70 can move in the axial direction in the axial tube 4 without rotating. The front end of the rear spring 10 is supported by the step portion 21 of the inner cylinder 20, and the rear end of the rear spring 10 is in contact with the holding member 6. As a result, the holding member 6 and eventually the operation member 70 to which the holding member 6 is attached are urged rearward by the rear spring 10. The rearward movement of the operation member 70 is restricted by the rear end surface of the cam flange 71 coming into contact with the front end surface of the second inner protrusion 24 of the inner cylinder 20.

The rotor 80 is disposed on the outer peripheral surface of the operation member 70 in front of the cam flange 71 so as to be movable in the front-rear direction and to be rotatable. At this time, the first inner cam 83 of the rotor 80 is arranged to cooperate with the first outer cam 23 of the inner cylinder 20. In the writing instrument 1 in a non-writing state (FIG. 2), the front end portion of the rotor 80 is inserted into the annular portion 51 of the rotating cam 50, and the front end surface of the protrusion 82 of the rotor 80 is the annular portion 51 of the rotating cam 50. It is in contact with the rear end surface. At this time, the rear end surface of the rotor 80, that is, the rotating cam receiving surface 81 is in contact with the rotating cam surface 72 of the operation member 70. As described above, since the rotary cam 50 is urged rearward by the front spring 11 via the sliding piece 60, the rotor 80 and, consequently, the operation member 70 in contact therewith is also urged rearward. Yes.

The brake rod 90 is disposed inside the operation member 70 and thus the rotor 80. The brake rod 90 is movable in the front-rear direction within the operation member 70 by gravity. The forward movement of the brake rod 90 is regulated by contacting the rear end surface of the spacer 30, that is, the rear end surface of the connecting portion 33. The rearward movement of the brake rod 90 is restricted by the taper surface 93 of the brake rod 90 engaging with the inner surface of the operation member 70 (FIG. 4).

The knock ring 100 is rotatably disposed around the through hole 74 of the operation member 70, and the knock ring 100 can be moved together with the operation member 70 in the front-rear direction. Specifically, the knock ring 100 is disposed between the cam flange 71 of the operation member 70 and the holding member 6 attached to the operation member 70, and movement in the front-rear direction with respect to the operation member 70 is restricted. At this time, as will be described later with reference to FIG. 19, each of the restricting protrusions 101 of the knock ring 100 is disposed in the corresponding through hole 74 of the operation member 70. In 74, it can rotate within the range of a predetermined angle. Further, the second inner cam 104 of the knock ring 100 is arranged to cooperate with the second outer cam 25 of the inner cylinder 20.

Next, the operation of the writing instrument 1 will be described.

The writing instrument 1 switches between the writing state and the non-writing state by performing a knocking operation that presses the operation portion at the rear end of the writing instrument 1 forward against the urging force of the rear spring 10 and the front spring 11. The basic operation will be described. Switching between the writing state and the non-writing state is performed by the cooperation of the rotating cam surface 72 of the operation member 70 and the rotating cam receiving surface 81 of the rotor 80, and the first inner cam 83 of the rotor 80 and the first of the inner cylinder 20. This is done by the cooperation of the outer cam 23. Since the cooperative operation between these cams is the same as that of a conventional knock type writing instrument, it will be briefly described below.

In the non-writing state, each of the protrusions 82 of the rotor 80 is disposed between the first inner protrusions 22 of the inner cylinder 20, thereby restricting the rotation of the rotor 80. In other words, the first inner protrusion 22 of the inner cylinder 20 is disposed in the locking groove 84 of the rotor 80. Therefore, the rotation of the rotor 80 is restricted. At this time, the rotating cam surface 72 of the operating member 70 and the rotating cam receiving surface 81 of the rotor 80 are in contact with each other, but their phases are shifted from each other.

When the operation member 70 moves forward by a knock operation, the rotor 80 moves forward due to being pressed by the cam flange 71. When the rotor 80 moves forward, the sliding piece 60 having the slider 62 disposed in the notch 43 of the collar member 40 and the collar member 40 are pushed forward by being pressed by the claw portion 52. Move to. As a result, the refill 5 connected to the sliding piece 60 protrudes from the shaft cylinder 4.

When the rotor 80 moves forward and the rear end of the protrusion 82 exceeds the front end of the first inner protrusion 22 of the inner cylinder 20 in the front-rear direction, the restriction on the rotation of the rotor 80 is released. At that moment, a circumferential component force is applied to restore the phase shifted between the rotating cam surface 72 of the operating member 70 and the rotating cam receiving surface 81 of the rotor 80, and this component force is applied to the rotor 80. Rotate slightly.

Next, when the knocking operation is stopped, the sliding piece 60, the rotating cam 50, the rotor 80, and the operating member 70 are moved slightly rearward through the collar member 40 by the biasing force of the front spring 11. At this time, the first inner cam 83 of the rotor 80 and the first outer cam 23 of the inner cylinder 20 cooperate to further rotate the rotor 80. That is, the slope 22a of the first inner protrusion 22 of the inner cylinder 20, which is a slope inclined in the same direction, and the rear end face of the protrusion 82 of the rotor 80 are brought into contact with each other, and a circumferential component force acts. The force causes the rotor 80 to rotate a little further. By this rotation, the phases of the rotating cam surface 72 of the operating member 70 and the rotating cam receiving surface 81 of the rotor 80 are shifted again. The rotation and backward movement of the rotor 80 are restricted by the first inner protrusion 22 of the inner cylinder 20 being locked to the locking portion 85 of the rotor 80. As a result, the refill 5 is maintained in a state of protruding from the shaft tube 4, and the writing instrument 1 is in a writing state.

In order to change from the written state to the non-written state, the knocking operation is performed again. When the operation member 70 moves forward by the knocking operation, the rotor 80 moves forward by being pressed by the cam flange 71. When the rotor 80 moves forward and the rear end of the protrusion 82 exceeds the front end of the first inner protrusion 22 of the inner cylinder 20 in the front-rear direction, the restriction on the rotation of the rotor 80 is released. At that moment, a circumferential component force is applied to restore the phase shifted between the rotating cam surface 72 of the operating member 70 and the rotating cam receiving surface 81 of the rotor 80, and this component force is applied to the rotor 80. Rotate slightly.

Next, when the knocking operation is stopped, the sliding piece 60, the rotating cam 50, the rotor 80, and the operating member 70 are moved slightly rearward through the collar member 40 by the biasing force of the front spring 11. At this time, the first inner cam 83 of the rotor 80 and the first outer cam 23 of the inner cylinder 20 cooperate to further rotate the rotor 80. That is, the slope 22a of the first inner protrusion 22 of the inner cylinder 20, which is a slope inclined in the same direction, and the rear end face of the protrusion 82 of the rotor 80 are brought into contact with each other, and a circumferential component force acts. The force causes the rotor 80 to rotate a little further. By this rotation, the phases of the rotating cam surface 72 of the operating member 70 and the rotating cam receiving surface 81 of the rotor 80 are shifted again. The rotation of the rotor 80 is restricted by repositioning each of the protrusions 82 of the rotor 80 between the first inner protrusions 22 of the inner cylinder 20. The rearward movement of the rotor 80 is restricted by the cam flange 71 of the operation member 70. As the rotor 80 moves rearward, the collar member 40, the sliding piece 60, and the rotating cam 50 that are urged by the front spring 11 also move rearward. As a result, the refill 5 is immersed in the shaft tube 4, and the writing instrument 1 is in a non-writing state.

The above-described knocking operation for switching between the writing state and the non-writing state is performed with the front end of the writing instrument 1 facing downward. On the other hand, when the front end of the writing instrument 1 is facing upward, the knocking operation cannot be performed. That is, even if it tries to push an operation part ahead, the movement of the operation member 70 is blocked | prevented and the operation member 70 cannot be moved ahead. This will be described below.

FIG. 18 is a schematic diagram for explaining the operation of the knock ring 100. FIG. 18 shows the positional relationship of the second inner cam 104 of the knock ring 100 with respect to the second outer cam 25 deployed in the circumferential direction, that is, the second inner protrusion 24 of the inner cylinder 20 and the knock ring 100. The positional relationship between the first outer protrusion 102 and the second outer protrusion 103 is shown. In FIG. 18, the upper side is the rear side of the writing instrument 1, and the lower side is the front side of the writing instrument 1. 18A shows a state before the knocking operation, FIG. 18B shows a state immediately after the operation unit starts moving forward by the knocking operation, and FIG. FIG. 18D shows a state immediately before the operation unit returns to the original position due to the stop of the knocking operation.

18A, the second inner protrusion 24 of the inner cylinder 20 is disposed in front of the second outer protrusion 103 of the knock ring 100 before the knocking operation is performed. When the knocking operation is performed from this state, the operation member 70 moves forward relative to the inner cylinder 20, and therefore the knock ring 100 also moves forward. At this time, the second outer cam 25 of the inner cylinder 20 and the second inner cam 104 of the knock ring 100 cooperate to rotate the knock ring 100. That is, the slope 24a of the second inner protrusion 24 of the inner cylinder 20 and the front end face of the second outer protrusion 103 of the knock ring 100, which have slopes inclined in the same direction, contact each other, and a circumferential component force acts. Then, the knock ring 100 rotates while moving forward (FIG. 18B). When the operation member 70 moves further forward, the second inner protrusion 24 of the inner cylinder 20 passes by the second outer protrusion 103, and the knock ring 100 and thus the operation member 70 can be moved sufficiently forward. (FIG. 18C), a knock operation is performed.

When the knock operation is stopped from the state shown in FIG. 18C, the operation member 70 is moved rearward relative to the inner cylinder 20 by the urging force of the rear spring 10, and therefore the knock ring 100 is also moved rearward. Moving. At this time, the second outer cam 25 of the inner cylinder 20 and the second inner cam 104 of the knock ring 100 cooperate to rotate the knock ring 100 in the opposite direction. That is, the partial inclined surface 24b of the second inner protrusion 24 of the inner cylinder 20 and the rear end surface of the first outer protrusion 102 of the knock ring 100, which have inclined surfaces inclined in the same direction, contact each other, and a circumferential component force acts. Then, the knock ring 100 rotates while retreating (FIG. 18D). As a result, the knock ring 100 and thus the operation member 70 are returned to their original positions (FIG. 18A).

As described above, in a state where the front end of the writing instrument 1 is facing downward, the knock ring 100 rotates in response to the knock operation, so that the operation member 70, that is, the operation portion is moved forward without being blocked. Is possible. On the other hand, in a state where the front end of the writing instrument 1 is facing upward, the rotation of the knock ring 100 is restricted by the brake rod 90, so that the forward movement of the operation unit is prevented, and the knock operation cannot be performed. Such a knock clock mechanism will be described with reference to FIG.

FIG. 19 is a cross-sectional view for explaining the operation of the brake rod 90. 19A is a cross-sectional view taken along line AA of FIG. 3 in which the front end of the writing instrument 1 is downward, and FIG. 19B is a cross-sectional view of FIG. 4 in which the front end of the writing instrument 1 is upward. It is sectional drawing in line BB.

As shown in FIG. 19 (A), when the front end of the writing instrument 1 is facing downward, the restriction projections 101 of the knock ring 100 are disposed in the through holes 74 of the operation member 70, respectively. FIG. 19A shows a state before the knocking operation, as in FIG. 18A, and at this time, the restricting projection 101 is close to one end edge of the through hole 74. Therefore, the knock ring 100 is rotatable within a predetermined angle range within the range of regulation that the regulation projection 101 receives from the end edge of the through hole 74.

As shown in FIG. 19 (B), when the front end of the writing instrument 1 is facing upward, the restricting projections 101 of the knock ring 100 are disposed in the through holes 74 of the operation member 70 respectively. The restricting portion 95 is arranged so as to fill the gap. That is, when the front end of the writing instrument 1 is directed upward, the brake rod 90 moves rearward due to gravity. As a result, the brake rod 90 is further inserted inside the operation member 70, and the restricting portion 95 is inserted into the clearance of the through hole 74. As a result, the restriction protrusion 101 of the knock ring 100 is engaged with the restriction portion 95 of the brake rod 90, so that the rotation of the knock ring 100 is restricted.

If the knock ring 100 cannot rotate, the inclined surface 24a of the second inner protrusion 24 of the inner cylinder 20 and the front end surface of the second outer protrusion 103 of the knock ring 100 will contact each other as described with reference to FIG. Even if it contacts, knock ring 100 does not rotate. As a result, the second inner protrusion 24 of the inner cylinder 20 and the second outer protrusion 103 of the knock ring 100 are locked, and further forward movement of the operation member 70 is prevented. Therefore, when the front end of the writing instrument 1 is facing upward, the operation unit is prevented from moving forward, and a knock operation cannot be performed.

When the front end of the writing instrument 1 is changed from the upward state to the downward state, the brake rod 90 moves forward, and the restriction on the rotation of the knock ring 100 is released. As a result, the knock operation can be performed again.

Since the writing instrument 1 is prevented from moving forward with the operating portion when the front end is upward, for example, when the writing instrument 1 using the erasing member 7 is erased, it is possible to perform a stable rubbing operation. Become. That is, even if the writing instrument 1 is changed and the operation unit is pressed against the writing surface to perform a rubbing operation, the operation unit does not rattle. According to the writing instrument 1, a stable rubbing operation can be realized with a simpler mechanism than in the past.

For example, a conventional knock clock mechanism described in Patent Document 1 (Japanese Patent Application Laid-Open No. 2016-107615) has a single knock clock member, and the knock clock member is moved and rotated in the front-rear direction by gravity. It was the structure which prevents the movement to the front of an operation part. On the other hand, the knocking mechanism of the writing instrument 1 has a brake rod 90 and a knock ring 100. Therefore, the members responsible for movement and rotation are separated such that the brake rod 90 only moves by gravity and the knock ring 100 only rotates. As a result, the knocking mechanism of the writing instrument 1 can have a shorter overall length as the mechanism than the knocking mechanism of Patent Document 1, and the shape and arrangement of components of the internal mechanism such as the vicinity of the inner peripheral surface of the shaft cylinder. You can make the design more freely about the place.

The brake rod may be a brake member of any shape as long as it can move in the longitudinal direction in the shaft cylinder by gravity. Further, the knock ring may be a C-shape that is not completely annular, and may be a rotating member of any shape as long as it can move with the operation unit and rotate around the central axis. Then, when the front end of the shaft cylinder is directed upward, the brake member moves backward, the rotation of the rotating member is restricted, and the rotating member is locked with the locking portion, thereby preventing the operation portion from moving forward. As long as the brake member and the rotation member are arbitrary, arbitrary shapes can be adopted.

By the way, if the writing instrument 1 is accidentally dropped while the front end of the writing instrument 1 is facing upward, a strong impact in the axial direction is applied to the operation unit. At this time, the inclined surface 24a of the second inner protrusion 24 of the inner cylinder 20 and the front end surface of the second outer protrusion 103 of the knock ring 100 collide, and the second inner protrusion 24 is deformed so as to expand in the circumferential direction. Then, the deformed second inner protrusion 24 cannot pass between adjacent second outer protrusions 103 of the knock ring 100 as shown in FIG. 18B, and there is a possibility that the knocking operation cannot be performed. In addition, even if the deformed second inner protrusion 24 can pass between the adjacent second outer protrusions 103 of the knock ring 100, the deformed second inner protrusion 24 is caught between the second outer protrusions 103, There is a possibility that the operation unit cannot be returned to the original position. This will be described with reference to FIG.

FIG. 20 is another schematic diagram for explaining the operation of the knock ring 100. FIG. 20 is a view similar to FIG. 18, and in FIG. 20, the upper side is the rear side of the writing instrument 1, and the lower side is the front side of the writing instrument 1. The knock ring 100 shown in FIG. 20 is the second outer protrusion 103 corresponding to the second inner protrusion 24 passing between the adjacent second outer protrusions 103 among the adjacent second outer protrusions 103, that is, the right side in the figure. The second outer protrusion 103 is formed shorter in the axial direction. That is, the front end surface of the second outer protrusion 103 on the right side in the drawing is formed so as to be arranged behind the front end surface of the other second outer protrusion 103.

20A shows the rear end surface of the second inner protrusion 24 of the inner cylinder 20 that does not pass between the adjacent second outer protrusions 103 due to the drop of the writing instrument 1, and the corresponding second outer protrusion 103 of the knock ring 100. FIG. It shows the moment when the front end face collides. At this time, the other second inner protrusion 24 of the inner cylinder 20 collides with the second outer protrusion 103 because the front end surface of the second outer protrusion 103 of the corresponding knock ring 100 is disposed further rearward. I have not done it. In FIG. 20B, as a result of the collision, the second inner protrusion 24 of the inner cylinder 20 that does not pass between the adjacent second outer protrusions 103 has a deformed deformed portion 24c. At this time, since the second inner protrusion 24 of the other inner cylinder 20 is not deformed, the second inner protrusion 24 can pass between the adjacent second outer protrusions 103 without affecting the knocking operation.

By the way, in a normal knock operation, the second inner side of the inner cylinder 20 is triggered by the contact between the rear end surface of the second inner protrusion 24 of the inner cylinder 20 and the front end surface of the second outer protrusion 103 of the knock ring 100. The protrusion 24 and the second outer protrusion 103 of the knock ring 100 may engage with each other, and the knock ring 100 may not be able to rotate. This will be described with reference to FIG.

FIG. 21 is another schematic diagram for explaining the operation of the knock ring 100. FIG. 21 is a view similar to FIG. 18. In FIG. 21, the upper side is the rear side of the writing instrument 1, and the lower side is the front side of the writing instrument 1. In FIG. 21, the angle α of the acute angle portion of the front end of the second outer protrusion 103 of the knock ring 100, in particular, the second outer protrusion 103 on the left side in the drawing, is in the range of 45 degrees to 90 degrees. Unintentional engagement between the second inner protrusion 24 and the second outer protrusion 103 of the knock ring 100 can be prevented.

As described above, by performing the knocking operation, the operation member 70, the rotor 80, and the rotating cam 50 move forward. When the rotary cam 50 moves forward, the sliding piece 60 having the slider 62 disposed in the notch 43 of the collar member 40 and the collar member 40 are pushed forward by being pressed by the claw portion 52. Move to. As a result, the writing portion 5 a of the refill 5 connected to the sliding piece 60 protrudes from the shaft tube 4. The operation of projecting the predetermined refill 5 will be described with reference to FIG.

FIG. 22 is a schematic diagram for explaining the refill operation during the knocking operation. As described above, each of the sliders 62 of the sliding piece 60 is disposed between the first cam surface 44 and the second cam surface 56. In FIG. 22, these are developed in the circumferential direction. Since it shows, in each figure, right and left are connected. Each of the sliding pieces 60 cooperates with the first cam surface 44 and the second cam surface 56. A circle attached to one of the three sliding pieces 60 is a mark drawn for convenience in order to identify the sliding piece 60. In FIG. 22, the upper side is the rear side of the writing instrument 1, and the lower side is the front side of the writing instrument 1. 22A shows the collar member 40, the rotating cam 50, and the sliding piece 60 in a non-writing state of the writing instrument 1, and FIG. 22B shows the collar member 40 and the rotating cam 50 immediately after the start of the knocking operation. 22C shows the collar member 40, the rotating cam 50, and the sliding piece 60 in the writing state of the writing instrument 1. FIG. Further, in FIG. 22, a T-shaped protrusion 13 provided on the inner peripheral surface of the rear shaft 3 is schematically shown.

When the knocking operation is performed from the state shown in FIG. 22A, the rotary cam 50 is also moved forward by the forward movement of the operation member 70, and the mark “◯” arranged in the notch 43 is attached. The sliding frame 60 and the collar member 40 move forward. At this time, the remaining two sliding pieces 60 are locked to the T-shaped protrusions 13 provided on the inner peripheral surface of the rear shaft 3 that is relatively stationary (FIG. 22B). Therefore, it can be said that the first cam surface 44 includes the rear end surface of the T-shaped protrusion 13. Next, when the rotating cam 50 further moves, as described above, the first inner cam 83 of the rotor 80 and the first outer cam 23 of the inner cylinder 20 cooperate, and the writing instrument 1 enters the writing state (FIG. 22 ( C)). At this time, the remaining two sliding pieces 60 are locked to the T-shaped protrusions 13 provided on the inner peripheral surface of the rear shaft 3 and therefore do not move forward.

If there is no T-shaped protrusion 13, other refills 5 other than the refill 5 protruding from the shaft tube 4 also move forward due to gravity. If it does so, a plurality of refills 5 will gather in the taper-shaped part of the front end of front axis 2, and there is a possibility of inhibiting the movement of refills 5 which want to make it project. Therefore, the writing instrument 1 is provided with a T-shaped projection 13 and the other refill 5 is locked to this, thereby restricting unnecessary advancement of the other refill 5. Therefore, the T-shaped protrusion 13 can have any shape as long as the refill 5 can be locked.

As apparent from FIG. 22, the refill 5 connected to the sliding piece 60 relatively advanced in the three refills 5 protrudes from the front end opening of the shaft cylinder 4 by the knocking operation, and the writing instrument 1 is Written state. Therefore, when the writing instrument 1 is in the non-writing state, the writing portion 5a of the refill 5 that is relatively advanced is arranged in the vicinity of the front end opening of the shaft tube 4, so that a smaller knock operation amount, that is, With a smaller knock stroke, the refill 5 can be projected to be in a written state. Further, during the knocking operation, the second cam surface 56 itself of the rotating cam 50 moves forward and presses the sliding piece 60, so that rattling between components can be suppressed. Further, the rotating cam 50, particularly the claw portion 52, can be a relatively large component, and the strength can be increased.

FIG. 23 is a schematic diagram for explaining the switching operation of the refill 5 that can appear and disappear, that is, the operation for changing the refill 5 to be written. FIG. 23 is a view similar to FIG. 22. In FIG. 23, the upper side is the rear side of the writing instrument 1, and the lower side is the front side of the writing instrument 1. The spacer 30 is fixed with respect to the front shaft 2. On the other hand, the inner cylinder 20, the collar member 40, the rotary cam 50, and the rear shaft 3 are rotatable with respect to the front shaft 2, and constitute a rotation selection member. In other words, the front shaft 2 can rotate with respect to the rear shaft 3.

In FIG. 23, for convenience of explanation, the rotation of the rear shaft 3 with respect to the front shaft 2 is based on the rear shaft 3, so that only the sliding piece 60 moves in the left-right direction in FIG. 23 according to the rotation of the rear shaft 3. Moving. Actually, the sliding piece 60 only moves in the front-rear direction in the groove between the rail portions 32 of the spacer 30. For convenience of explanation, the three sliding pieces 60 are distinguished as a sliding piece 60A, a sliding piece B, and a sliding piece 60C. As described above, during the knocking operation, the refill 5 connected to the sliding piece 60 disposed in the notch 43 of the collar member 40, that is, the refill 5 disposed at the selected position, is applied to the claw portion 52. It is pressed and protrudes from the shaft cylinder 4. Therefore, by changing the refill 5 arranged at the selected position, it is possible to make the desired refill 5 appear and disappear. Further, for convenience of explanation, it is assumed that the rear shaft 3 is freely rotatable with respect to the front shaft 2.

FIG. 23A shows a state in which the sliding piece 60A is arranged at the advanced position in the writing instrument 1 in the non-writing state. When the knocking operation is performed in this state, as described above, the refill 5 connected to the sliding piece 60A is in a writing state. At this time, the other sliding

pieces

60B and 60C are engaged with the T-shaped protrusions 13 provided on the inner peripheral surface of the rear shaft 3 as described with reference to FIG. Movement is restricted.

In the state shown in FIG. 23A, when the rear shaft 3 is rotated clockwise with respect to the front shaft 2 as viewed from the rear of the writing instrument 1, each of the sliding pieces 60 moves in the right direction in the figure. Move relatively. At this time, along with the rotation of the rear shaft 3, that is, the rotation of the collar member 40, the sliding piece 60A arranged at the advanced position moves rearward along the slope of the first cam surface 44, and the sliding piece 60B rides on the raised portion 42 against the urging force of the front spring 11 (FIG. 23B). As the sliding piece 60B rides on the raised portion 42, the collar member 40 moves forward by the height of the raised portion 42 as compared to the state shown in FIG.

Further, when the rear shaft 3 is rotated, the sliding piece 60B moves in the circumferential direction relatively along the raised portion 42, and the sliding piece 60C moves forward along the end surface 55 of the rotating cam 50 (see FIG. 23 (C)). Next, at the moment when the sliding piece 60 </ b> B exceeds the end of the raised portion 42, the collar member 40 that has moved forward by the height of the raised portion 42 is instantaneously moved backward by the biasing force of the front spring 11. (FIG. 23D). At this time, the sliding piece 60B collides with the rear end surface of the collar member 40. At the same time, the sliding piece 60 </ b> C collides with the end surface of the notch 43 of the collar member 40. At the same time, the sliding piece 60 </ b> A collides with the front end surface 27 of the inner cylinder 20. As a result, the sliding piece 60C is disposed in the cutout portion 43 of the collar member 40, and the switching of the refill 5 is completed (FIG. 23E). Since these collisions are performed almost simultaneously, the user who has rotated the rear shaft 3 can feel the impact and the click sound resulting from the impact, and the switching operation of the refillable 5 can be completed. Can be recognized. The raised portion 42 may be omitted.

The torque necessary for starting the rotation of the rear shaft 3 for switching the refillable refill 5, that is, the initial torque, is to change the height of the raised portion 42 that is raised stepwise, the shape of the stepped portion, etc. Can be changed to a desired value. By considering the frictional resistance associated with the movement of the sliding piece 60 and appropriately adjusting the initial torque, when rotating by applying a torque greater than the initial torque, the subsequent inertial force instantaneously refills the adjacent refill 5. Can be switched.

FIG. 24 is a schematic diagram for explaining the operation of the refill 5 during the knocking operation according to another embodiment. FIG. 24 is a view similar to FIG. 22, with the upper side being the rear side of the writing instrument 1 and the lower side being the front side of the writing instrument 1. In FIG. 24, the axial length of the claw portion 152 of the rotating cam 150 is set so that the front end surface of the claw portion 152 is aligned with the front end surface 27 of the inner cylinder 20. In this case, the refill 5 at the selected position is not in the advanced position, that is, the refill 5 connected to the sliding piece 60 disposed in the notch 43, but in the claw portion 152 of the rotary cam 150 in the axial direction. It is the refill 5 connected to the sliding piece 60 arrange | positioned in the position which opposes. In the present embodiment, when the rear shaft 3 is rotated, the sliding piece 60 and the rotating cam 150 are not in contact with each other, so that the refill 5 that can appear and disappear more smoothly can be switched.

In the above-described embodiment, the rotation of the rear shaft 3 relative to the front shaft 2, that is, the rotation of the rotation selection member is restricted within a predetermined angle range. That is, as shown in FIG. 2, in the writing instrument 1 in a non-writing state, the front end portion of the guide projection 53 of the rotating cam 50 can be disposed outside the connecting piece 33 a of the spacer 30. In other words, the connecting piece 33a of the spacer 30 and the guide protrusion 53 of the rotating cam 50 do not interfere with each other. When the rear shaft 3 is rotated in one direction with respect to the front shaft 2 in this state, the rotation restricting piece 33b of the spacer 30 and the guide protrusion 53 of the rotating cam 50 come into contact with each other, and the rotation of the rear shaft 3 is restricted. That is, one side surface 33c (FIG. 10) in the circumferential direction of the rotation restricting piece 33b of the spacer 30 and the guide protrusion 53 of the rotating cam 50 abut. When the rear shaft 3 is rotated to the other side with respect to the front shaft 2, the other side surface 33 c in the circumferential direction of the rotation restricting piece 33 b of the spacer 30 and the guide protrusion 53 of the rotating cam 50 come into contact with each other. Therefore, the rotation of the rotation selection member can be restricted within a predetermined angle range. At this time, for example, from the state shown in FIG. 23A, the sliding shaft 60C is arranged in the notch 43 of the collar member 40 by rotating the rear shaft 3 by 120 degrees in FIG. After the transition to the indicated state, the rear shaft 3 cannot be rotated any more. Therefore, in order to place the sliding piece 60B in the notch 43 of the collar member 40, it is necessary to rotate the rear shaft 3 by 240 degrees in the reverse direction. The rotation of the rotation selection member may be restricted to a predetermined angle range by providing a locking mechanism in the plurality of annular protrusions 37 of the spacer 30 or the plurality of annular grooves 14 of the rear shaft 3.

By restricting the angle at which the rear shaft 3 can rotate to a predetermined range (that is, a range of 240 degrees), the refill 5 protruding by the knocking operation at that time can be distinguished at a glance. That is, in the state shown in FIG. 23A, the clip 28 of the inner cylinder 20 and the mark portion 35 arranged on the display member 12 are arranged to be aligned as shown in FIG. When the clip 28 and the mark portion 35 are aligned, the refill 5 connected to the sliding piece 60A is projected by a knocking operation. Since the mark portion 35 moves integrally with the front shaft 2, the positional relationship between the clip 28 and the mark portion 35 changes according to the rotation direction of the front shaft 2. Therefore, by looking at the positional relationship between the clip and the mark portion 35, it can be determined which refill 5 is in the selected position and is in the writing state by the knocking operation. At this time, the mark portion 35 and the two triangular marks (FIG. 1) may be colored with the ink color of the refill 5 to facilitate the determination.

The front shaft 2 and the rear shaft 3 can rotate relatively only when the writing instrument 1 is in a non-writing state. In other words, the rotation selection member can be rotated only when the writing instrument 1 is in a non-writing state. That is, in the writing instrument 1 in the writing state, as shown in FIG. 22C, the rotating cam 50 moves forward. At this time, the rotating cam 50 presses the corresponding sliding piece 60 forward, and the guide protrusion 53 of the rotating cam 50 is inserted into the groove between the rail portions 32 of the spacer 30. For this reason, even if the rotation selection member is to be rotated, the rotation is restricted by the engagement between the guide projection 53 of the rotating cam 50 and the rail portion 32, and cannot be rotated. Therefore, when the writing instrument 1 is in the writing state, the front shaft 2 cannot be rotated with respect to the rear shaft 3. Therefore, the malfunction that the rotation selection member is rotated unintentionally during writing and the refill 5 is changed is prevented. On the other hand, when the writing instrument 1 is in a non-writing state, the guide protrusion 53 of the rotating cam 50 is disposed behind the rail portion 32 and does not engage with the rail portion 32, so that the rotation selection member can be rotated.

Further, even if the writing instrument 1 is changed from the writing state to the non-writing state by the knocking operation, the same refill 5 is in the selected position unless the rotation selection member is rotated as described with reference to FIG. . Therefore, for example, when writing in black and then knocking to make a non-writing state and writing again in black, without selecting an operation unit corresponding to each refill, a single operation is performed. The black refill 5 can be put into the writing state again only by knocking the operation portion. That is, the appearance of the same refill 5 is repeated by knocking a single operation unit without searching for a predetermined operation unit to project a desired refill 5 from a plurality of operation units each time. Can be done easily. On the other hand, as described above, switching the refill 5 in the writing state by a knocking operation can be easily performed by rotating the rotation selection member around the axis.

In addition, by rotating the rotation selection member about the axis, each of the sliding pieces 60 moves in the front-rear direction, and thus a plurality of springs that individually urge each of the refills 5 connected to the sliding piece 60. There is no need to place. That is, with a single front spring 11, a multi-core and knock-type writing instrument can be realized. As a result, the writing instrument 1 can reduce the proportion of the protrusion / retraction mechanism and the refill selection mechanism relative to the total length in the axial direction, and can further reduce the outer diameter of the writing instrument 1, and can be a simple mechanism. . Further, by disposing the single front spring 11 outside the spacer 30, that is, in the vicinity of the inner peripheral surface of the shaft cylinder 4, it is possible to prevent the refill 5 from coming into contact with the front spring 11 and being damaged. That is, since the rail portion 32 of the spacer 30 covers many portions of the outer peripheral surface facing the radially outward direction of the refill 5, the refill 5 does not contact the front spring 11. Furthermore, since a plurality of operation units are not arranged on the outer peripheral surface of the writing instrument 1, there are few irregularities, and it is possible to print a pattern or decorate.

An opening is provided on the side surface of the shaft tube 4 or the shaft tube 4 is transparent or semi-transparent so that it can be determined which refill 5 is in the writing state by the knocking operation, that is, which refill 5 is at the selected position. It may be. Specifically, in the case where an opening is provided on the side surface of the shaft cylinder 4, the side surface of the corresponding shaft cylinder 4 of each sliding piece 60 is visible from the opening only when the sliding piece 60 is in the advanced position. An opening may be formed in the surface. The sliding piece 60 may be colored with the same color as the writing color of the refill 5 to be inserted.

In the embodiment described above, the writing instrument 1 has the three refills 5, but may be two or more, and one of them may be a mechanical pencil or a marking pen instead of the ballpoint pen refill. It is good also as a double-type writing instrument made into other kinds of refills, such as a touch pen, an eraser, or a friction body. Moreover, although the erasing member 7 which erase | eliminates the handwriting by the writing instrument 1 was provided in the rear end part of the writing instrument 1, in addition to this, you may provide an erasing member in the different location of the writing instrument 1 in addition to this. . For example, an erasing member may be provided on a part of the front shaft 2, for example, the front end portion, or an erasing member may be provided on the clip.

In the above-described embodiment, specific examples of protrusions, grooves, cam structures, and the like have been shown. However, as long as they have the same effect, they may be configured with different numbers, shapes, or independent separate parts.

At least one of the refills 5 in the above-described embodiment may be a refill containing a thermochromic ink containing a thermochromic color material. In this case, the writing instrument 1 is a thermochromic writing instrument, and the handwriting of the writing instrument 1 can be discolored by frictional heat generated when it is rubbed by a friction body as an erasing member.

Here, the thermochromic ink means that a predetermined color (first color) is maintained at room temperature (for example, 25 ° C.), and when the temperature is raised to a predetermined temperature (for example, 60 ° C.), the color changes to another color (second color). The ink has the property of returning to the original color (first color) when cooled to a predetermined temperature (for example, −5 ° C.). In the writing instrument 1 using the thermochromic ink, the second color is made colorless and the stroke drawn with the first color (for example, red) is heated to make it colorless, which is herein referred to as “erasing”. . Accordingly, the frictional body rubs against the writing surface on which the drawn line is written to generate frictional heat, thereby changing the drawn line to colorless, that is, erasing it. Of course, the second color may be a color other than colorless.

As the thermochromic microcapsule pigment that becomes a thermochromic color material, those that change color due to heat such as frictional heat, for example, those that have a function from colored to colorless, colored to colored, colorless to colored, etc. There are no particular limitations, and various types can be used. Examples include microencapsulated thermochromic compositions containing at least a leuco dye, a developer, and a color change temperature adjusting agent.

The leuco dye that can be used is not particularly limited as long as it is an electron-donating dye and functions as a color former. Specifically, from the viewpoint of obtaining an ink having excellent color development characteristics, conventionally known ones such as triphenylmethane, spiropyran, fluoran, diphenylmethane, rhodamine lactam, indolylphthalide, leucooramine, It can be used alone (one kind) or in a mixture of two or more kinds (hereinafter simply referred to as “at least one kind”).

Specifically, 6- (dimethylamino) -3,3-bis [4- (dimethylamino) phenyl] -1 (3H) -isobenzofuranone, 3,3-bis (p-dimethylaminophenyl) -6 -Dimethylaminophthalide, 3- (4-diethylaminophenyl) -3- (1-ethyl-2-methylindol-3-yl) phthalide, 3- (4-diethylamino-2-ethoxyphenyl) -3- (1 -Ethyl-2-methylindol-3-yl) -4-azaphthalide, 1,3-dimethyl-6-diethylaminofluorane, 2-chloro-3-methyl-6-dimethylaminofluorane, 3-dibutylamino-6 -Methyl-7-anilinofluorane, 3-diethylamino-6-methyl-7-anilinofluorane, 3-diethylamino-6-methyl-7-xylidino Luolan, 2- (2-chloroanilino) -6-dibutylaminofluorane, 3,6-dimethoxyfluorane, 3,6-di-n-butoxyfluorane, 1,2-benz-6-diethylaminofluorane, 1 2-benz-6-dibutylaminofluorane, 1,2-benz-6-ethylisoamylaminofluorane, 2-methyl-6- (Np-tolyl-N-ethylamino) fluorane, 2- (N -Phenyl-N-methylamino) -6- (Np-tolyl-N-ethylamino) fluorane, 2- (3'-trifluoromethylanilino) -6-diethylaminofluorane, 3-chloro-6 -Cyclohexylaminofluorane, 2-methyl-6-cyclohexylaminofluorane, 3-di (n-butyl) amino-6-methoxy-7-anilinofluor Lan, 3,6-bis (diphenylamino) fluorane, methyl-3 ', 6'-bisdiphenylaminofluorane, chloro-3', 6'-bisdiphenylaminofluorane, 3-methoxy-4-dedecoxy Stylinoquinoline, etc.

These leuco dyes have a lactone skeleton, a pyridine skeleton, a quinazoline skeleton, a bisquinazoline skeleton, etc., and develop color when these skeletons (rings) are opened.

The developer that can be used is a component having the ability to develop the leuco dye, such as a phenol resin compound, a salicylic acid metal chloride, a salicylic acid resin metal salt compound, a solid acid compound, etc. Is mentioned.

Specifically, o-cresol, tertiary butylcatechol, nonylphenol, n-octylphenol, n-dodecylphenol, n-stearylphenol, p-chlorophenol, p-bromophenol, o-phenylphenol, hexafluorobisphenol, p N-butyl hydroxybenzoate, n-octyl p-hydroxybenzoate, resorcin, dodecyl gallate, 2,2-bis (4′-hydroxyphenyl) propane, 4,4-dihydroxydiphenylsulfone, 1,1-bis (4′-hydroxyphenyl) ethane, 2,2-bis (4′-hydroxy-3-methylphenyl) propane, bis (4-hydroxyphenyl) sulfide, 1-phenyl-1,1-bis (4′-hydroxy Phenyl) ethane, 1,1-bi (4′-hydroxyphenyl) -3-methylbutane, 1,1-bis (4′-hydroxyphenyl) -2-methylpropane, 1,1-bis (4′-hydroxyphenyl) n-hexane, 1,1- Bis (4′-hydroxyphenyl) n-heptane, 1,1-bis (4′-hydroxyphenyl) n-octane, 1,1-bis (4′-hydroxyphenyl) n-nonane, 1,1-bis ( 4′-hydroxyphenyl) n-decane, 1,1-bis (4′-hydroxyphenyl) n-dodecane, 2,2-bis (4′-hydroxyphenyl) butane, 2,2-bis (4′-hydroxy) Phenyl) ethyl propionate, 2,2-bis (4′-hydroxyphenyl) -4-methylpentane, 2,2-bis (4′-hydroxyphenyl) hexafluoropropane 2,2-bis (4'-hydroxyphenyl) n- heptane, 2,2-bis (4'-hydroxyphenyl) n- nonane at least one, and the like.

The amount of the developer to be used may be arbitrarily selected according to the desired color density, and is not particularly limited, but is usually 0.1 to 1 part by weight with respect to 1 part by mass of the leuco dye described above. It is preferable to select within a range of about 100 parts by mass.

The color change temperature adjusting agent that can be used is a substance that controls the color change temperature in the coloration of the leuco dye and the developer. Conventionally known color change temperature adjusting agents can be used. Specific examples include alcohols, esters, ketones, ethers, acid amides, azomethines, fatty acids, hydrocarbons and the like.

More specifically, bis (4-hydroxyphenyl) phenylmethane dicaprylate (C ₇ H ₁₅ ), bis (4-hydroxyphenyl) phenylmethane dilaurate (C ₁₁ H ₂₃ ), bis (4-hydroxyphenyl) phenyl Methane dimyristate (C ₁₃ H ₂₇ ), bis (4-hydroxyphenyl) phenylethane dimyristate (C ₁₃ H ₂₇ ), bis (4-hydroxyphenyl) phenyl methane dipalmitate (C ₁₅ H ₃₀ ), bis Examples thereof include at least one of (4-hydroxyphenyl) phenylmethane dibehenate (C ₂₁ H ₄₃ ), bis (4-hydroxyphenyl) phenylethylhexylidene dimyristate (C ₁₃ H ₂₇ ), and the like.

The amount of the color-change temperature adjusting agent used may be appropriately selected according to the desired hysteresis width and color density at the time of color development, and is not particularly limited, but is usually based on 1 part by mass of the leuco dye. It is preferably used within the range of about 1 to 100 parts by mass.

The thermochromic microcapsule pigment is obtained by microencapsulating a thermochromic composition containing at least the leuco dye, the developer, and the color change temperature adjusting agent so that the average particle diameter is 0.1 to 5 μm. Can be manufactured. Examples of the microencapsulation method include interfacial polymerization method, interfacial polycondensation method, in situ polymerization method, liquid curing coating method, phase separation method from aqueous solution, phase separation method from organic solvent, melt dispersion cooling method, air A suspension coating method, a spray drying method, etc. can be mentioned, and can be appropriately selected according to the application.

For example, in a phase separation method from an aqueous solution, a leuco dye, a developer, and a color change temperature adjusting agent are heated and melted, then charged into an emulsifier solution, heated and stirred to disperse into oil droplets, and then as a capsule film agent, Use resin raw materials, for example, gradually add amino resin solution, isocyanate resin solution, etc., and continue to react to prepare, then filter this dispersion to produce the desired thermochromic microcapsule pigment be able to.

The content of these leuco dyes, developer, and color change temperature adjusting agent varies depending on the type of leuco dye, developer, color change temperature adjusting agent used, microencapsulation method, etc. In terms of mass ratio, the developer is 0.1 to 100, and the color change temperature adjusting agent is 1 to 100. The capsule membrane agent is 0.1 to 1 in mass ratio with respect to the capsule contents.

The thermochromic microcapsule pigment is a combination of the above-described leuco dye, color developer and color change temperature adjusting agent in appropriate combination, amount, etc., to develop the color temperature of each color (for example, color development at -20 ° C. or higher), decolorization temperature. (For example, decoloration at 60 ° C. or higher) can be set to a suitable temperature, and it is preferable that the color is changed from colorless to colorless by heat such as frictional heat.

In the thermochromic microcapsule pigment, the wall film is preferably formed of a urethane resin, a urea / urethane resin, an epoxy resin, or an amino resin from the viewpoint of further improving the drawing density, storage stability, and writing property. As a urethane resin, the compound of isocyanate and a polyol is mentioned, for example. As an epoxy resin, the compound of an epoxy resin and an amine is mentioned, for example. Examples of amino resins include melamine resins, urea resins, and benzoguanamine resins. The thickness of the wall film of the microcapsule coloring material is appropriately determined according to the required strength of the wall film and the drawn line density.

The average particle size of the thermochromic microcapsule pigment is low in color, color developability, easy decoloring, stability, fluidity in ink, and adverse effects on writing properties. From the viewpoint of compatibility with the microcapsule pigment, it is preferably 0.1 to 5 μm, and more preferably 0.3 to 3 μm. The “average particle diameter” defined here is a value obtained by measuring the average particle diameter (50% diameter) with a particle size analyzer [Microtrac HRA9320-X100 (Nikkiso Co., Ltd.)] (refractive index 1.8). It is.

If the average particle size is less than 0.2 μm, sufficient line density cannot be obtained. On the other hand, if it exceeds 5 μm, the writing property is deteriorated, the dispersion stability of the thermochromic microcapsule pigment is lowered, and the ink is caused by vibration. Back is likely to occur, which is not preferable. Further, the 90% diameter is 8 μm or less, preferably 6 μm or less. When particles having a large diameter are present in a certain ratio or more, the above-described influence tends to become more prominent. The microcapsule pigment having the above average particle size range (0.1 to 5 μm) varies depending on the microencapsulation method. However, in the phase separation method from an aqueous solution, stirring during the production of the microcapsule pigment is possible. It can be prepared by suitably combining conditions.

The specific gravity of the thermochromic microcapsule pigment is in the range of 0.9 to 1.3, preferably 1.0 to 1.2. If the specific gravity is outside this range, the dispersion stability of the microcapsule pigment tends to be lowered. In addition, microcapsule pigments having a specific gravity exceeding 1.3 are liable to generate ink back due to vibration.

In the water-based ink composition for writing instruments, in addition to the thermochromic microcapsule pigment, the balance is water (tap water, purified water, distilled water, ion-exchanged water, pure water, etc.), and other writing instruments (ballpoint pens) Depending on the purpose of use, for marking pens, etc., water-soluble organic solvents, thickeners, lubricants, rust preventives, antiseptics or antibacterial agents may be appropriately contained within a range that does not impair the effect. it can.

Examples of water-soluble organic solvents that can be used include glycols such as ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, polyethylene glycol, 3-butylene glycol, thiodiethylene glycol, and glycerin, ethylene glycol monomethyl ether, and diethylene glycol monomethyl. Ethers can be used alone or in combination.

Among these, glycerin is preferably used for the purpose of suppressing ink solidification in the writing part due to ink back, and the amount added is preferably 1 to 10% by mass with respect to the total amount of ink. Although the mechanism of action by glycerin is unknown, it is presumed that it has the effect of reducing the cohesive strength with the pigment and ink components in the dry state.

As the thickener that can be used, for example, at least one selected from the group consisting of synthetic polymers, celluloses and polysaccharides is preferable. Specifically, gum arabic, gum tragacanth, guar gum, locust bean gum, alginic acid, carrageenan, gelatin, xanthan gum, welan gum, succinoglycan, diutane gum, dextran, methylcellulose, ethylcellulose, hydroxyethylcellulose, carboxymethylcellulose, starch glycolic acid and Salts thereof, propylene glycol alginate, polyvinyl alcohol, polyvinyl pyrrolidone, polyvinyl methyl ether, polyacrylic acid and salts thereof, carboxyvinyl polymer, polyethylene oxide, copolymer of vinyl acetate and polyvinyl pyrrolidone, cross-linked acrylic acid polymer and Examples thereof include non-crosslinked acrylic acid polymers and salts thereof, styrene acrylic acid copolymers and salts thereof, and the like. That.

Of these, it is preferable to use polysaccharides. Polysaccharides tend to be less susceptible to fluidity due to vibrations due to their rheological properties, and problems such as poor writing due to ink back are less likely to occur. Xanthan gum is particularly preferable because it is excellent in balance with other properties required for writing instrument inks.

Lubricants include fatty acid esters of polyhydric alcohols, higher fatty acid esters of sugars, polyoxyalkylene higher fatty acid esters, alkyl phosphate esters, alkyl sulfonates of higher fatty acid amides, alkyl allyl sulfones, which are also used in pigment surface treatment agents. Examples thereof include acid salts, polyalkylene glycol derivatives, fluorine-based surfactants, and polyether-modified silicones. Examples of the rust inhibitor include benzotriazole, tolyltriazole, dicyclohexylammonium nitrite, and saponins. Examples of the antiseptic or antibacterial agent include phenol, sodium omadin, sodium benzoate, and benzimidazole compounds.

In order to produce this water-based ink composition for writing instruments, a conventionally known method can be employed. For example, in addition to the thermochromic and photochromic microcapsule pigments, a predetermined amount of each component in the water is used. It is obtained by mixing and stirring and mixing with a homomixer or a stirrer such as a disper. Furthermore, if necessary, coarse particles in the ink composition may be removed by filtration or centrifugation.

The viscosity value of the water-based ink composition for writing instruments is preferably 500 to 2000 mPa · s at 25 ° C. and a shear rate of 3.83 / s, and 20 to 100 mPa · s at a shear rate of 383 / s. By setting the viscosity within the above range, the ink can be excellent in writability and stability over time. Furthermore, S = αD ⁿ (where 1>n> 0) (S is the shear stress (dyn / cm ² ), D is the shear rate (s ⁻¹ ), α is the non-Newtonian viscosity coefficient) The required non-Newtonian viscosity index n is preferably 0.2 to 0.6. By setting the non-Newtonian viscosity index n in the above range in addition to the above viscosity range, it is possible to appropriately set the fluidity of the ink with respect to vibration and to prevent the occurrence of ink back.

The surface tension of the water-based ink composition for writing instruments is preferably 25 to 45 mN / m, more preferably 30 to 40 mN / m. Within this range, the balance between the inside of the pen tip and the ink wettability becomes appropriate, and the occurrence of ink back can be prevented.

In the refill, an ink follower may be arranged immediately behind the ink. The material constituting the follower can be composed of at least a non-volatile or hardly volatile organic solvent and a thickener. The non-volatile or hardly volatile organic solvent used for the ink follower is used as a base oil for the ink follower, and for example, liquid paraffin is used. As the liquid paraffin, mineral oil or chemically synthesized oil is used. As the chemically synthesized oil, polybutene, poly α-olefin, ethylene α-olefin oligomer, or the like can be used.

Specific examples of the mineral oil that can be used include commercially available Diana Process Oil NS-100, PW-32, PW-90, NR-68, AH-58 (manufactured by Idemitsu Kosan Co., Ltd.).

Specific polybutenes that can be used include, for example, the commercially available products Nissan Polybutene 200N, Polybutene 30N, Polybutene 10N, Polybutene 5N, Polybutene 3N, Polybutene 015N, Polybutene 06N, Polybutene 0N (above, manufactured by NOF Corporation), Polybutene Examples thereof include HV-15 (manufactured by Nippon Petrochemical Co., Ltd.) and 35R (manufactured by Idemitsu Kosan Co., Ltd.).

Specific poly α-olefins that can be used include, for example, commercially available barrel process oils P-26, P-46, P-56, P-150, P-350, P-1500, P-2200, (P-10000, P-37500) (manufactured by Matsumura Oil Co., Ltd.).

Specific ethylene α-olefin oligomers that can be used include, for example, commercially available Lucant HC-10, HC-20, HC-100, HC-150, (HC-600, HC-2000) (and above, Mitsui). Chemical Co., Ltd.).

These non-volatile or hardly volatile organic solvents can be used alone or in combination of two or more.

Examples of thickeners used in ink followers include calcium phosphate phosphate, fine particle silica, polystyrene-polyethylene / butylene rubber-polystyrene block copolymer, polystyrene-polyethylene / propylene rubber-polystyrene block copolymer, and hydrogenated styrene. -Butadiene rubber, block copolymer of styrene-ethylenebutylene-olefin crystal, block copolymer of olefin crystal-ethylenebutylene-olefin crystal, acetoalkoxyaluminum dialchelate, and the like, and these can be used alone or in combination.

As a preferable commercial product of a calcium salt of a phosphate ester that can be used, Crodax DP-301LA (manufactured by Croda Japan) and the like can be mentioned. The fine particle silica that can be used includes hydrophilic fine particle silica and hydrophobic fine particle silica. Preferred commercially available products of hydrophilic silica include AEROSIL-300 and AEROSIL-380 (manufactured by Nippon Aerosil Co., Ltd.). Preferred examples of commercially available hydrophobic silica include AEROSIL-974D, AEROSIL-972 (manufactured by Nippon Aerosil Co., Ltd.) and the like.

Preferred examples of commercially available polystyrene-polyethylene / butylene rubber-polystyrene block copolymers include Kraton GFG-1901X, Kraton GG-1650 (above, Shell Japan), Septon 8007, Septon 8004 (above, Kuraray), etc. Is mentioned. Further, examples of preferable commercially available polystyrene-polyethylene / propylene rubber-polystyrene block copolymers include Kraton GG-1730 (manufactured by Shell Japan), Septon 2006, Septon 2063 (manufactured by Kuraray Co., Ltd.), and the like.

Preferred examples of commercially available hydrogenated styrene-butadiene rubber include DYNARON 1320P, DYNARON 1321P (manufactured by JSR Corporation), Tuftec H1041, Tuftech H141 (manufactured by Asahi Kasei Kogyo Co., Ltd.), and the like.

DYNARON 4600P (manufactured by JSR Corporation) and the like are preferable styrene-ethylene butylene-olefin crystal block copolymers, and DYNARON 6200P, DYNARON 6201B (DYNARON 6201B) JSR) and the like.

Preferred commercial products of acetoalkoxyaluminum dialchelate include Plenact AL-M (manufactured by Ajinomoto Fine Techno Co.).

Among these thickeners, from the standpoint of further exerting the effects of the present invention, thermoplastic olefin elastomers such as block copolymers of styrene-ethylenebutylene-olefin crystals and block copolymers of olefin crystals-ethylenebutylene-olefin crystals are used. Use is preferred.

Furthermore, in order to obtain an ink follower that prevents the occurrence of ink back, the average value of the tan δ values measured for each frequency while increasing exponentially in the frequency range of 1 to 63 rad / s should be 1.0 or more. Is preferable, and 1.7 to 3.4 is more preferable.

Here, tan δ is a value meaning loss elastic modulus / storage elastic modulus, and conventionally, an average value of tan δ values measured for each frequency while increasing exponentially in the frequency region “1 to 63 rad / s”. Has been known to be preferably 1.0 or less. In the present invention, when the average value of the tan δ values measured for each frequency at 1 to 63 rad / s is 1.0 or more, it is possible to absorb vibration and prevent ink back.

Further, it is preferable that the friction body is colored with a color having a lightness value lower than that of the thermochromic ink accommodated in the writing instrument 1. That is, when the thermochromic ink of the writing instrument 1 is transferred to the surface of the friction body without being discolored when the friction body is used, the transfer of the thermochromic ink can be made inconspicuous. In particular, when the color of the friction body is black or the lightness value is 2.5 or less, the surface contamination due to the use of the friction body can be made inconspicuous.

The lightness value is a Munsell color system using a measuring device such as a general-purpose color difference meter (TC-8600A, manufactured by Tokyo Denshoku Co., Ltd.). The lightness value is a writing speed of 4.5 m / min on paper (former JIS P3201; high quality paper made from 100% chemical pulp, basis weight range of 40 to 157 g / m2, whiteness of 75.0% or more), It is obtained by measuring the ink on the drawn line written at a pitch interval of 0.1 mm.

As a material constituting the friction body, a polypropylene resin is used in an amount of 50% by mass or more, and the tensile modulus (JIS K 7161: 2014-1) of the friction body is preferably 70 MPa or more.
By using a friction body having this characteristic, there is little resistance when the handwriting formed with the thermochromic ink is discolored or discolored by rubbing, and sufficient frictional heat can be obtained even with a light force. In addition, it is easy to erase fine parts.

The polypropylene-based resin that can be used is a base material for the friction body. For example, propylene homopolymer, propylene and other small amount of α-olefin (for example, ethylene, 1-butene, 1-hexene, 1 -Octene, 4-methyl-1-pentene and the like) and the like (including block copolymers and random copolymers). As said polypropylene resin, these 1 type, or 2 or more types of mixtures can be used.
By using 50% by mass or more of the polypropylene resin in the total amount of the friction body, the effect of the present embodiment can be exhibited.

Examples of resins that can be used in addition to the polypropylene resin include polyethylene and ionomer. These resins are desirably used in an amount of 0.5 to 30% by mass based on the total amount of the friction body from the viewpoint of further exerting the effects of the present embodiment.

Furthermore, the material constituting the friction body is preferably a rosin resin, a terpene resin, a petroleum resin, a phenolic resin, coal from the viewpoint of adjusting the tackiness and exhibiting sufficient frictional heat even with a light force. At least one resin selected from a series resin and a xylene series resin can be contained.
Among these resins, those having a molecular weight of several hundred to several thousand are selected, and by adding them to a blending system of polypropylene resin which is the main component of the friction body, the friction body is given tackiness, and this embodiment The effect of can be further demonstrated. Specifically, the molecular weight of natural resins such as rosin resins and terpene resins, petroleum resins, phenolic resins, coal resins, xylene resins, etc. is preferably 500 to 5000, more preferably 700 to 4000. The above various resins can be used.

Examples of rosin resins include gum rosin, tall oil rosin, wood rosin, hydrogenated rosin, disproportionated rosin, polymerized rosin, modified rosin glycerin, pentaerythritol ester, and the like, and terpene resins include α-pinene, Examples thereof include terpene resins such as β-pinene and dipentene, aromatic modified terpene resins, terpene phenol resins, and hydrogenated terpene resins.
Among these resins, polymerized rosin, terpene resin, hydrogenated terpene resin, aromatic modified hydrogenated terpene resin, and terpene phenol resin are preferable from the viewpoint of further stability.

Petroleum resins, for example, as a mixture of cracked oil fractions containing unsaturated hydrocarbons such as olefins and diolefins by-produced together with petrochemical basic raw materials such as ethylene and propylene by thermal decomposition of naphtha in the petrochemical industry It is obtained by polymerization with a Friedel-Crafts type catalyst.
The petroleum-based resin, C ₅ fraction (co) polymer obtained by aliphatic petroleum resin, a C ₉ fraction obtained by thermal cracking of naphtha (co) polymerization obtained by thermal cracking of naphtha aromatic petroleum resin obtained Te, the C ₅ fraction and C ₉ fraction copolymerized copolymerization petroleum resin obtained, hydrogenation system, dicyclopentadiene-based such as alicyclic compound-based petroleum resins, Examples thereof include petroleum resins such as styrene resins such as styrene, substituted styrene, and copolymers of styrene and other monomers.
C ₅ fraction obtained by thermal decomposition of naphtha usually contains olefins such as 1-pentene, 2-pentene, 2-methyl-1-butene, 2-methyl-2-butene and 3-methyl-1-butene. Examples include hydrocarbons, diolefin hydrocarbons such as 2-methyl-1,3-butadiene, 1,2-pentadiene, 1,3-pentadiene, 3-methyl-1,2-butadiene, and the like.
Also, the C ₉ fraction (co) polymerized aromatic petroleum resin obtained, a vinyl toluene, a resin obtained by polymerizing an aromatic carbon atoms 9, indene major monomer, the thermal decomposition of naphtha Specific examples of the C ₉ fraction obtained by styrene include styrene homologues such as α-methylstyrene, β-methylstyrene, and γ-methylstyrene, and indene homologues such as indene and coumarone.
Trade names include Mitsui Chemicals Petrogin, Mikuni Chemical Petlite, JX Nippon Oil & Energy Neopolymer, Tosoh Petcole, PetroTac and the like.

Furthermore, modified petroleum resin modified petroleum resin comprising the C ₉ fraction, as a sticky, resin highly compatible adhesive persistence, in this embodiment, is suitably used.
The modified petroleum resins, C9 petroleum resins modified with an unsaturated alicyclic compound, C ₉ petroleum resins modified with a compound having a hydroxyl group, C ₉ petroleum resins modified with unsaturated carboxylic acid compounds, and the like .
Preferred unsaturated cycloaliphatic compounds include cyclopentadiene, methylcyclopentadiene, and the like, and Dielspenter reaction products of alkylcyclopentadiene include dicyclopentadiene, cyclopentadiene / methylcyclopentadiene co-dimer, tricyclopentadiene, etc. And dicyclopentadiene is particularly preferable.
Dicyclopentadiene-modified C ₉ petroleum resin in the presence of dicyclopentadiene and C ₉ fraction both can be obtained by thermal polymerization or the like.
The dicyclopentadiene-modified C ₉ petroleum resin include, for example, JX Nippon Oil & Energy Ltd. Neo polymer 130S.

Examples of the compound having a hydroxyl group include alcohol compounds and phenol compounds.
Specific examples of the alcohol compound include alcohol compounds having a double bond such as allyl alcohol, 2-butene-1, and 4 diol.
As the phenol compound, alkylphenols such as phenol, cresol, xylenol, pt-butylphenol, p-octylphenol and p-nonylphenol can be used.
These hydroxyl group-containing compounds may be used alone or in combination of two or more.

Hydroxyl group-containing C ₉ petroleum resin, after introducing the ester group in the petroleum resin by thermal polymerization with petroleum distillate (meth) acrylic acid alkyl ester, a method of reducing the ester group, in the petroleum resin two It can also be produced by a method of hydrating the double bond after remaining or introducing the heavy bond.
Further, as the hydroxyl group-containing C ₉ petroleum resin, can be used those obtained by the various methods as, Performance, viewed from the manufacturing aspect, it is preferred to use a phenol-modified petroleum resins, phenol-modified petroleum resin, obtained by cationic polymerization of the C ₉ fraction in the presence of phenol, modified is easy and low cost.
The phenol-modified _{C 9} petroleum resin, for example, JX Nippon Oil & Energy Ltd. Neo polymer -E-130.

Further, as a modified C ₉ petroleum resin with an unsaturated carboxylic acid compound, it is possible to use those obtained by modifying the C ₉ petroleum resin in an ethylenically unsaturated carboxylic acid.
Typical examples of such ethylenically unsaturated carboxylic acids include (anhydrous) maleic acid, fumaric acid, itaconic acid, tetrahydro (anhydrous) phthalic acid, (meth) acrylic acid or citraconic acid.
Unsaturated carboxylic acid-modified C ₉ petroleum resin can be obtained by thermally polymerizing C ₉ petroleum resin and ethylenically unsaturated carboxylic acid. In the present embodiment, the maleic acid-modified C ₉ petroleum resin is preferable.

Examples of the unsaturated carboxylic acid-modified C ₉ petroleum resin, for example, JX Nippon Oil & Energy Ltd. Neo polymer 160.
Further, it can be suitably used C ₅ fraction and C ₉ fraction copolymer resin obtained by thermal cracking of naphtha.
Examples of the C ₉ fraction is not particularly limited, it is preferably a C ₉ fraction obtained by thermal cracking of naphtha.
Specific examples include Struktol series TS30, TS30-DL, TS35, TS35-DL manufactured by SCHILL & SEILACHER.

Examples of the phenol resins include alkylphenol formaldehyde resins and rosin-modified products thereof, alkylphenol acetylene resins, modified alkylphenol resins, terpene phenol resins, and the like. Specifically, the product name Hitanol 1502 (Hitachi, which is a novolac type alkylphenol resin). Kasei Kogyo Co., Ltd.) and trade name colesin (manufactured by BASF) which is a pt-butylphenol acetylene resin.
Coal-based resins include coumarone indene resins and the like, and xylene-based resins include xylene formaldehyde resins and the like.
Other polybutenes can also be used as a resin having tackiness.
Among these resins, adhesive, from the viewpoint of adhesive persistence, C ₅ fraction and C ₉ fraction copolymer resin, C ₉ fraction (co) polymer obtained by aromatic petroleum resins, Phenol resins and coumarone indene resins are preferred.

These resins preferably have a softening point of 200 ° C. or less (measurement method: ASTM E28-58-T), and more preferably in the range of 80 to 150 ° C.
If the softening point exceeds 200 ° C, the workability may be deteriorated, and if it is less than 80 ° C, the adhesive performance may be inferior. From these viewpoints, the softening point is more preferably in the range of 90 to 120 ° C. The above resins may be used alone or in combination of two or more.

The blending amount of at least one resin selected from the rosin resin, terpene resin, petroleum resin, phenol resin, coal resin, and xylene resin used for the purpose of adjusting the tackiness is as follows. From the viewpoint of further exerting the above effect, the total amount of the friction body is preferably 0.05 to 20% by mass, and more preferably 0.05 to 10% by mass.

In addition to the polypropylene resin and the like used for the purpose of adjusting the adhesiveness, the friction body of the present embodiment includes a heat stabilizer and an antioxidant as desired, as long as the effects of the present embodiment are not impaired. Agents, light stabilizers, ultraviolet absorbers, crystal nucleating agents, antiblocking agents, sealability improvers, mold release agents (eg, stearic acid and silicone oil), lubricants such as polyethylene wax, colorants, pigments, inorganic Fillers (eg, alumina, talc, calcium carbonate, mica, wollastonite, and clay), foaming agents (organic, inorganic), and flame retardants (eg, hydrated metal compounds, red phosphorus, ammonium polyphosphate, An optional component such as an antimony compound and silicon can be included in an appropriate amount.
Further, alkylsulfonic acid phenyl ester and cyclohexanedicarboxylic acid ester may be further contained in the friction material. By including the alkyl sulfonic acid phenyl ester and cyclohexane dicarboxylic acid ester in the friction body, it is possible to erase the handwriting without damaging the paper surface and without making printed characters or the like distorted.
The friction body of the present embodiment can be manufactured using the above-described polypropylene resin and the like, for example, by a method such as extrusion molding or injection molding.

The friction body of this embodiment needs to have a tensile elastic modulus (JIS K 7161: 2014-1) of 70 MPa or more from the viewpoint of imparting durability and exhibiting the effects of this embodiment. Is preferably 80 to 5000 MPa. If the tensile elastic modulus is less than 70 MPa, the effect of this embodiment cannot be exhibited, which is not preferable.
In order to set the tensile elastic modulus of the friction body to 70 MPa or more, it can be adjusted by suitably combining the type of polypropylene resin to be used, the blending amount, other resin types, the content thereof, and the like.

More preferably, the permanent elongation of the friction body (JIS K 6273: 2006) is set to 50% or more, particularly preferably 50 to 100% from the viewpoint of further exerting the effect of the present embodiment and reducing resistance. Is desirable.
“Permanent elongation” defined in the present embodiment refers to removing stress after holding a test piece in a state of being doubled at 23 ° C. for 6 hours. The value (%) obtained by dividing the stretched length by the length before stretching.

Further, in the present embodiment, it is desirable that the friction coefficient of the friction body be 0.3 to 0.5 from the viewpoint of providing an appropriate resistance without slipping excessively.
The “friction coefficient” defined in the present embodiment uses a commercially available surface property measuring instrument (HEIDON-14D, Shinto Kagaku Co., Ltd.), and the friction body is made of high-quality paper with a weight of 4.9 N and an angle of 90 ° Refers to the coefficient of friction measured by rubbing at a writing speed of 100 mm / min.
In order to set the permanent elongation and friction coefficient of the friction body within suitable ranges, the blending amount of the polypropylene-based resin to be used, other resin types, the content thereof, and the like can be adjusted appropriately.
Note that the friction body can also be applied as a touch pen or a stylus pen, and may impart conductivity.

According to the friction body of the present embodiment, compared to conventional elastomers such as styrene-based elastomers, plastic foams and the like, polypropylene resin is 50% by mass or more, and the tensile elastic modulus of the friction body is 70 MPa or more. There is little resistance when the handwriting formed with thermochromic ink is rubbed and discolored or decolored, sufficient frictional heat can be obtained even with a light force, and erasure of fine parts becomes easy. It will be able to demonstrate unprecedented functions.
Furthermore, by setting the permanent elongation of the friction body to 50% or more and / or the friction coefficient of 0.3 to 0.5, the above functions can be exhibited more effectively.

FIG. 25 is a perspective view of a writing instrument 201 according to another embodiment of the present invention. The writing instrument 201 differs from the writing instrument 1 according to the above-described embodiment in the shape of the rear shaft and the spacer, and the other members are the same or substantially the same, so only the differences will be described.

FIG. 26 is a longitudinal sectional view of the rear shaft 203. In the assembled state of the writing instrument 1, the rear shaft 203 is arranged so that the upper side is the rear side of the writing instrument 201 in FIG. On the inner peripheral surface of the rear shaft 203, two substantially I-shaped elongated protrusions 213 are provided as locking portions. The two elongate protrusions 213 are spaced apart by 120 degrees around the central axis. The elongated protrusion 213 is not provided on the inner peripheral surface of the rear shaft 203, but may be provided as a separate member, for example. The position of the front end portion of the elongated protrusion 213 on the rear shaft 203 is the same as the position of the front end portion of the T-shaped protrusion 13 on the rear shaft 3 of the corresponding writing instrument 1. However, the position of the rear end portion of the elongated protrusion 213 on the rear shaft 203 is located in front of the position of the rear end portion of the T-shaped protrusion 13 on the rear shaft 3 of the writing instrument 1. That is, the length of the elongated protrusion 213 in the axial direction is shorter than the length of the T-shaped protrusion 13 in the axial direction.

FIG. 27 is a perspective view of the spacer 230. In the assembled state of the writing instrument 201, the spacer 230 is arranged so that the upper side is the rear side of the writing instrument 201 in FIG. The spacer 230 has a connecting portion 233 formed so as to connect the rear end portions of the three rail portions 32. The connecting portion 233 has three connecting portion pieces 33 a having an outer shape formed slightly smaller than the outer diameter of the three rail portions 32. That is, the spacer 230 does not have the rotation restricting piece 33 b in the spacer 30 of the writing instrument 1. Therefore, in the writing instrument 201, the rear shaft 203 can freely rotate with respect to the front shaft 2. That is, the rotation of the rear shaft 203 around the axis is not restricted by the contact between the connecting portion 233 of the spacer 230 and the guide protrusion 53 of the rotating cam 50. On the front end surface of the flange portion 34, a projecting mark portion 235 extending forward is formed. The mark part 235 protrudes outward in the radial direction from the mark part 35 in the writing instrument 1. Therefore, in the writing instrument 201, the mark portion 235 protrudes from the outer surface of the shaft tube 4 to such an extent that it can be clearly discriminated by touching with a finger (FIG. 25). Thereby, the connection part of the front axis | shaft 2 and the rear axis | shaft 3 can be discriminate | determined easily.

FIG. 28 is a schematic diagram for explaining the refilling operation during the knocking operation. The refilling operation at the time of the knocking operation on the writing instrument 201 is basically the same as the refilling operation at the time of the knocking operation on the writing instrument 1 described above with reference to FIG. However, unlike the T-shaped projection 13 in the writing instrument 1, the elongated projection 213 in the writing instrument 201 is not related to the refilling operation during the knocking operation, and is therefore not shown in FIG. In the writing instrument 1 in the writing state, as described with reference to FIG. 22, two sliding pieces 60 out of the three sliding pieces 60 are locked to the T-shaped protrusions 13, and the two sliding pieces 60. The advance of was regulated. However, in the writing instrument 201, the position of the rear end portion of the elongated protrusion 213 is positioned forward of the position of the rear end portion of the T-shaped protrusion 13 of the writing instrument 1, so that the sliding piece 60 is engaged with the elongated protrusion 213. There is no stopping.

Here, in the writing instrument 1, the sliding piece 60 is locked or substantially locked to the T-shaped protrusion 13 in both the non-writing state (FIG. 22A) and the writing state (FIG. 22C). doing. Therefore, if the writing instrument 1 is accidentally dropped with the front end of the writing instrument 1 facing downward, a strong impact in the axial direction is applied to the sliding piece 60 and the refill 5 connected to the sliding piece 60. At this time, since the sliding piece 60 is locked to the T-shaped protrusion 13, the refill 5 receives an inertial force in a direction away from the sliding piece 60.

On the other hand, in the writing instrument 201, the sliding piece 60 is not locked to the elongated protrusion 213, so even if the front end of the writing instrument 201 falls downward, the refill 5 moves forward together with the sliding piece 60. Move to. Therefore, there is no possibility that the refill 5 is detached from the sliding piece 60. In other words, since the sliding piece 60 and the first cam surface 44 are separated from each other in the writing state of the writing instrument 201, only the sliding piece 60 is not restricted from moving forward, and the refill 5 is the sliding piece. There is no risk of coming off from 60. The advance of the refill 5 and the sliding piece 60 is restricted by the writing portion 5a of the refill 5 coming into contact with the tapered portion of the front end of the front shaft 2.

DESCRIPTION OF SYMBOLS 1 Writing instrument 4 Shaft cylinder 5 Refill 7 Erasing member 10 Rear spring 11 Front spring 13 T-shaped protrusion 20 Inner cylinder 30 Spacer 40 Collar member 50 Rotating cam 60 Sliding piece 70 Operation member 80 Rotor 90 Brake rod 100 Knock ring

Claims

A knock type writing instrument comprising a shaft cylinder and an operation unit, and capable of switching between a writing state and a non-writing state by performing a knocking operation of pressing the operation unit forward,
A brake member that can move in the longitudinal direction in the shaft cylinder by gravity, a rotating member that moves together with the operating portion and that can rotate around a central axis, and a locking portion that can be locked with the rotating member. And
When the front end of the shaft tube is directed upward, the brake member moves rearward, the rotation of the rotating member is restricted, and the rotating member is locked with the locking portion, so that the operation portion is moved forward. Knock-type writing instrument characterized by being prevented from moving.
The knock type writing instrument according to claim 1, wherein the rotating member is a cylindrical member.
The protrusion is provided in the inner surface of the said rotation member, The rotation of the said rotation member is controlled when the said brake member inserted in the said rotation member latches with the said protrusion. 2. Knock type writing instrument according to 2.
The rotating member has a first slope inclined in the circumferential direction with respect to a plane perpendicular to the front-rear direction, and the second locking part is inclined in the circumferential direction with respect to a plane perpendicular to the front-rear direction. Has a slope,
4. The forward movement of the operation unit is prevented when the first inclined surface of the rotating member whose rotation is restricted comes into contact with the second inclined surface of the locking portion. 5. The knock-type writing instrument as described in any one of.
The knock-type writing instrument according to claim 4, wherein the first slope or the second slope is larger than 45 degrees in an inclination angle with respect to the axial direction of the knock-type writing instrument.
A plurality of writing bodies; a sliding member to which each of the writing bodies is connected; and a first cam surface disposed in front of the sliding member and cooperating with each of the sliding members. The knock type writing instrument according to any one of claims 1 to 5, wherein at least one of the sliding members and the first cam surface are separated from each other in a state.
The knock-type writing instrument according to any one of claims 1 to 6, wherein all or part of the operation unit is an erasing unit capable of erasing the handwriting of the knock-type writing instrument.
The knock-type writing instrument according to claim 7, wherein the erasing portion is a friction body having a polypropylene resin of 50 mass% or more and a tensile elastic modulus (JIS K 7161: 2014-1) of 70 MPa or more. .