CN111670124B

CN111670124B - Pressing type writing tool

Info

Publication number: CN111670124B
Application number: CN201880088390.9A
Authority: CN
Inventors: 住吉聪; 并木义春
Original assignee: Mitsubishi Pencil Co Ltd
Current assignee: Mitsubishi Pencil Co Ltd
Priority date: 2018-01-31
Filing date: 2018-12-20
Publication date: 2021-12-10
Anticipated expiration: 2038-12-20
Also published as: JP2022137207A; WO2019150828A1; CN111670124A

Abstract

Provided is a knock-type writing instrument having a simple mechanism capable of performing a smooth rubbing operation and the like. A knock-type writing instrument (1) is provided with a pen holder (4) and an operation section, and can be switched between a writing state and a non-writing state by performing a knock operation of pushing the operation section forward, and the knock-type writing instrument (1) is further provided with: a brake lever (90) which can move in the front-rear direction in the pen holder (4) under the action of gravity; a knock ring (100) that can move together with the operation section and rotate around the central axis; and a locking part which can be locked with the pressing ring (100), when the front end of the penholder (4) faces upwards, the brake lever (90) moves backwards, the rotation of the pressing ring (100) is limited, the pressing ring (100) is locked with the locking part, thereby the forward movement of the operation part is prevented.

Description

Pressing type writing tool

Technical Field

The present invention relates to a knock type writing instrument.

Background

There is known a knock-type writing instrument having a knock lock member formed in a cylindrical shape and movable in a front-rear direction in a barrel by gravity (patent document 1). In the knock-type writing instrument described in patent document 1, the operation portion disposed at the rear end portion of the barrel is prevented from moving forward by locking the knock lock member in a state where the front end is upward, and the knock operation is not performed. Therefore, when the handwriting of the knock-type writing instrument is erased by using the erasing member provided at the rear end portion of the operation portion, a smooth rubbing operation can be performed. That is, even if the knock-type writing instrument is turned to press the erasing member against the writing surface and perform the rubbing operation, the erasing member does not shake.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2016-107615

Disclosure of Invention

Problems to be solved by the invention

In the knock-type writing instrument described in patent document 1, the tubular knock lock member moves in the front-rear direction in the vicinity of the inner peripheral surface of the barrel within a range of a predetermined distance by the action of gravity, and therefore, there are restrictions on the shape of the components of the internal mechanism and the location where the components are disposed. In order to increase the design margin of the internal mechanism, it is preferable to prevent the forward movement of the operating portion in the state where the front end is upward by another mechanism.

The invention provides a knock-type writing instrument having a simple mechanism capable of performing a smooth rubbing operation.

Means for solving the problems

According to an aspect of the present invention, there is provided a knock-type writing instrument including a barrel and an operation portion, and being switchable between a writing state and a non-writing state by performing a knock operation of pushing the operation portion forward, the knock-type writing instrument further including: a braking member movable in the cartridge in a front-rear direction under the gravity; a rotating member that is movable together with the operating portion and rotates about a central axis; and an engaging portion engageable with the rotary member, wherein when the front end of the barrel is directed upward, the brake member moves rearward, rotation of the rotary member is restricted, and the rotary member engages with the engaging portion, whereby forward movement of the operating portion is prevented.

The rotating member may be a cylindrical member. The rotation member may be provided with a protrusion on an inner surface thereof, and the braking member inserted into the rotation member may be locked to the protrusion, thereby restricting rotation of the rotation member. The rotation member may have a 1 st inclined surface inclined in a circumferential direction with respect to a plane perpendicular to the front-rear direction, the locking portion may have a 2 nd inclined surface inclined in the circumferential direction with respect to a plane perpendicular to the front-rear direction, and the operation portion may be prevented from moving forward by abutting the 1 st inclined surface of the rotation member, the rotation of which is restricted, against the 2 nd inclined surface of the locking portion. The 1 st slope or the 2 nd slope may be inclined at an angle greater than 45 degrees with respect to the axial direction of the knock-type writing instrument. The knock-type writing instrument may include: a plurality of writing bodies; sliding members to which the writing bodies are respectively connected; and a 1 st cam surface disposed in front of the slide member and cooperating with the slide members, respectively, at least one of the slide members being spaced apart from the 1 st cam surface in a writing state. The operation unit may be an erasing unit that can erase a handwriting of the knock-type writing instrument, wholly or partially. The eliminating part may be a friction body having a polypropylene resin content of 50 mass% or more and a tensile elastic modulus (JIS K7161: 2014-1) of 70MPa or more.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, the common effect is to provide a knock-type writing instrument having a simple mechanism capable of performing a smooth rubbing operation or the like.

Drawings

Fig. 1 is a perspective view of a writing instrument according to an embodiment of the present invention.

Fig. 2 is a longitudinal sectional view of the writing instrument in a non-writing state with the front end facing downward.

Fig. 3 is a longitudinal sectional view of the writing instrument in a writing state with the front end facing downward.

Fig. 4 is an enlarged longitudinal sectional view of the writing instrument with the front end upward.

Fig. 5 is a partial cutaway perspective view of the rear portion of the writing instrument.

Fig. 6 is a perspective view of the rear portion of the writing instrument in a non-writing state.

Fig. 7 is a perspective view of the opposite side of the writing instrument of fig. 6.

Fig. 8 is a longitudinal sectional view of the rear barrel.

FIG. 9 is a longitudinal sectional view of the inner cylinder.

Fig. 10 is a perspective view of the spacer.

Fig. 11 is a perspective view of the sleeve.

Fig. 12 is a rear view of the rotary cam.

Fig. 13 is a perspective view of the slider.

Fig. 14 is a perspective view of the operating member.

Fig. 15 is a perspective view of the rotor.

FIG. 16 is a perspective view of the brake lever.

Fig. 17 is a perspective view of the snap ring.

Fig. 18 is a schematic diagram illustrating an operation of the knock ring.

FIG. 19 is a cross-sectional view illustrating the operation of the brake lever.

Fig. 20 is another schematic diagram illustrating the operation of the snap ring.

Fig. 21 is another schematic diagram illustrating the operation of the snap ring.

Fig. 22 is a schematic diagram illustrating the operation of the pen core in the knock operation.

Fig. 23 is a schematic diagram illustrating a switching operation of the pen core which can be inserted into and withdrawn from the pen body.

Fig. 24 is a schematic diagram illustrating the operation of the pen core in the knock operation according to another embodiment.

Fig. 25 is a perspective view illustrating a writing instrument according to another embodiment of the present invention.

Fig. 26 is a longitudinal sectional view of the rear barrel.

Fig. 27 is a perspective view of the spacer.

Fig. 28 is a schematic diagram illustrating the operation of the pen core in the knock operation.

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Throughout the drawings, corresponding elements are designated by common reference numerals.

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 with a tip facing downward, fig. 3 is a longitudinal sectional view of the writing instrument 1 in a writing state with a tip facing downward, fig. 4 is an enlarged longitudinal sectional view of the writing instrument 1 with a tip facing upward, fig. 5 is a partially cut perspective view of a rear portion of the writing instrument 1, fig. 6 is a perspective view of a rear portion of the writing instrument 1 in a non-writing state, and fig. 7 is a perspective view of an opposite side of the writing instrument 1 of fig. 6.

The writing instrument 1 has: a barrel 4 formed in a cylindrical shape and provided with a front barrel 2 and a rear barrel 3; and a plurality of writing elements 5 as writing bodies arranged in the barrel 4 and having a writing section 5a at one end. The front barrel 2 and the rear barrel 3 may be formed as one body. In fig. 6 and 7, the barrel 3 is not depicted.

In the present specification, the writing section 5a side is defined as the "front" side and the side opposite to the writing section 5a is defined as the "rear" side in the axial direction of the writing instrument 1. The central axis or the axial direction is referred to as the central axis or the axial direction of the writing instrument 1 unless otherwise mentioned.

The writing instrument 1 is a knock-type writing instrument in which the pen core 5 is protruded and retracted into the barrel 4 by a knock operation of pushing the operation portion forward. The writing instrument 1 is also a multi-core writing instrument having a plurality of writing cores 5.

The writing instrument 1 includes an inner barrel 20 attached to a rear end portion of the rear barrel 3 and including a clip 28. And may also include an inner barrel 20 and be referred to as a barrel 4. The writing instrument 1 includes, in the barrel 4: a spacer 30; a sleeve member 40 disposed around the spacer 30; a rotary cam 50 disposed rearward of the sleeve member 40; a slide block 60 as a plurality of slide members disposed between the inner tube 20 and the sleeve member 40; an operation member 70 disposed behind the spacer 30; a rotor 80 disposed around the operating member 70; a brake lever 90 disposed inside the operating member 70; and a knock ring 100 disposed around the operating member 70 behind the rotor 80.

A cancel member 7 is attached to the rear end portion of the operating member 70 via a 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 cancellation member 7 is integrally provided to the holding member 6 by bonding, two-color molding, or the like. The erasing member 7 may be detachable from the holding member 6, and a part of the holding member 6 may function as the erasing member. The operating member 70 is moved forward and is pushed to perform the pushing operation by pushing the cover member 8 in the attached state forward or pushing the cancellation member 7 forward in the state where the cover member 8 is removed. 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 portion for the knock operation. The entire or a part of the operation unit may be an erasing unit that can erase the handwriting of the writing instrument 1. In fig. 4 and 5, the cover member 8 is not depicted.

The holding member 6 is biased rearward by a rear spring 10. Therefore, the holding member 6, the erasing member 7, and the cover member 8 are always disposed at the same position in the axial direction regardless of whether the writing instrument 1 is in the writing state or the non-writing state. In addition, the rear spring 10 may be omitted. The front spring 11 is disposed in front of the sleeve member 40, and the sleeve member 40 is biased rearward by the front spring 11. An annular display member 12 is disposed between the front barrel 2 and the rear barrel 3. Two triangular arrows pointing in opposite directions to each other in the circumferential direction are provided on the outer surface of the display member 12.

In fig. 2 to 4, the upper side is a vertical upper side, and the lower side is a vertical lower side. That is, gravity acts downward in the drawings. As described below, the brake lever 90 is movable in the front-rear direction within the barrel 4 by gravity. Therefore, in fig. 2 and 3, the front end of the writing instrument 1, that is, the front end of the barrel 4 is directed downward, and therefore the brake lever 90 is located closer to the front end side in the barrel 4. In fig. 4, since the front end of the writing instrument 1 is directed upward, the brake lever 90 is located at the rear end side in the barrel 4 as compared with fig. 2 and 3.

The structure of the main components is explained with appropriate reference to fig. 1 to 7.

Fig. 8 is a longitudinal sectional view of the rear barrel 3. The rear barrel 3 is disposed so that an upper portion in fig. 8 is a rear side of the writing instrument 1 in an assembled state of the writing instrument 1. Two T-shaped projections 13 having a substantially T-shape are provided as engaging portions on the inner peripheral surface of the rear barrel 3. The two T-shaped projections 13 are arranged 120 degrees apart around the central axis. A plurality of annular grooves 14 are formed on the inner peripheral surface of the front end of the rear barrel 3 so as to be spaced apart in the axial direction. The T-shaped projection 13 may be a separate member, for example, instead of being provided on the inner peripheral surface of the rear barrel 3.

Fig. 9 is a longitudinal sectional view of the inner cylinder 20. The inner cylinder 20 is disposed so that the upper side of fig. 9 is the rear side of the writing instrument 1 in the assembled state of the writing instrument 1. The inner cylinder 20 is fitted or press-fitted to the rear end of the rear barrel 3. A step portion 21 facing rearward is formed on the inner peripheral surface of the inner cylinder 20. Six 1 st inner protrusions 22 extending in the axial direction are provided at equal intervals in the circumferential direction at a portion of the inner peripheral surface of the inner cylinder 20 forward of the step portion 21. A slope 22a inclined in the circumferential direction is formed on the front end surface of each of the 1 st inner protrusions 22. The six 1 st inner protrusions 22 constitute the 1 st outer cam 23. A 2 nd inner protrusion 24 protruding further than the 1 st inner protrusion 22 is formed as an engaging portion at a rear end portion of each of the 1 st inner protrusions 22. A slope 24a inclined in the circumferential direction is formed on the rear end surface of each of the 2 nd inner projections 24, and a partial slope 24b inclined in the circumferential direction is formed on a part of the front end surface of each of the 2 nd inner projections 24 (see fig. 18 a described later). The six 2 nd inner protrusions 24 constitute a 2 nd outer cam 25. A recess 26 is formed by cutting out a rectangle at the front end of the inner cylinder 20.

Fig. 10 is a perspective view of septum 30. Spacer 30 is disposed so that the upper side in fig. 10 is the rear side of writing instrument 1 in the assembled state of writing instrument 1. The separator 30 includes: a cylindrical body portion 31; three guide rail portions 32 extending rearward from a rear end portion of the body portion 31; a coupling portion 33 formed to couple rear end portions of the three rail portions 32. The coupling portion 33 has: two connecting pieces 33a whose outer peripheries are formed smaller than the outer diameters of the three guide rail portions 32; and a rotation restricting piece 33b formed as an extension of the guide rail portion 32 or formed to have a larger diameter than the connecting piece 33 a. Three grooves into which the pen refill 5 can be inserted are defined by two adjacent guide rail portions 32 and the coupling portion 33. That is, in the present embodiment, the writing instrument 1 can accommodate three pen cores 5. A flange portion 34 is formed on the outer peripheral surface of the body portion 31, and the outer peripheral surface of the body portion 31 is divided into front and rear portions by the flange portion 34. A projecting mark portion 35 extending forward is formed on the front end surface of the flange portion 34. The marker 35 is fitted in the recess of the display member 12 (fig. 1). A male screw portion 36 is formed at the front portion of the body 31, and the separator 30 is screwed to the front barrel 2 by the male screw portion 36. A plurality of annular projections 37 are formed on the rear portion of the body portion 31 so as to be spaced apart in the axial direction.

Fig. 11 is a perspective view of the sleeve member 40. The sleeve member 40 is disposed so that the upper side in fig. 11 is the rear side of the writing instrument 1 in the assembled state of the writing instrument 1. The sleeve member 40 is formed in a cylindrical shape as a whole. Two T-shaped recesses 41 are formed in the outer peripheral surface of the sleeve member 40 in complementary shapes at positions corresponding to the T-shaped projections 13 of the rear barrel 3. A ridge portion 42 that rises in a stepwise manner is formed in a portion of the rear end surface corresponding to a space between the two T-shaped recessed portions 41. A cutout portion 43 (fig. 7) is formed in a part of the rear end surface of the sleeve member 40, the cutout portion being cut out so as to be inclined forward from the rear end side. The rear end surface of the sleeve member 40 including the end surface of the notch portion 43 constitutes the 1 st cam surface 44.

Fig. 12 is a rear view of the rotating cam 50. The rotary cam 50 is disposed so that the upper side in fig. 12 is the rear side of the writing instrument 1 in the assembled state of the writing instrument 1. The rotating cam 50 includes an annular portion 51 formed annularly around the center axis and a claw portion 52 formed in a claw shape. The annular portion 51 is formed to be attached to an inner surface of a rear end portion of the claw portion 52. A guide projection 53 having a projection shape 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 complementary to the recess 26 of the inner cylinder 20. Therefore, in the writing instrument 1 in the non-writing state, the claw portion 52 is fitted into the recess 26 of the inner tube 20, and the outer surface of the rotary cam 50 is flush with the outer peripheral surface of the inner tube 20. The outer diameter of the annular portion 51 is formed slightly smaller than the inner diameter of the inner cylinder 20. The front portion of the claw portion 52 has a flat surface 54 formed flatly and an end surface 55 formed obliquely. The flat surfaces 54 and the end surfaces 55 of the pawl portions 52 constitute the 2 nd 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 slide block 60. The slide block 60 is disposed so that the upper side in fig. 13 is the rear side of the writing instrument 1 in the assembled state of the writing instrument 1. The slide block 60 has an insertion portion 61 inserted into the rear end portion of the pen core 5 and a slide 62 formed on the side surface of the insertion portion 61. Since the slider 62 slides along the 1 st cam surface 44 as described later, a minute projection 63 is formed on the front end surface of the slider 62 so that the frictional resistance at the time of sliding is reduced. Since the slider 62 slides along the 2 nd cam surface 56, a similar minute projection can be formed on the rear end surface of the slider 62.

Fig. 14 is a perspective view of the operating member 70. The operating member 70 is disposed so that the upper side in fig. 14 is the rear side of the writing instrument 1 in the assembled state of the writing instrument 1. The operating member 70 is a hollow member whose front end is open and whose rear end is closed. A cam flange 71 is formed on the outer peripheral surface of the operating member 70. A rotary cam surface 72 is formed on the front end surface of the cam flange 71, and the rotary cam surface 72 includes symmetrical and continuous peaks and valleys. Six guide grooves 73 extending in the axial direction are formed at equal intervals in the circumferential direction on the outer peripheral surface of the cam flange 71. Two rectangular through holes 74 extending in the axial direction are formed around the central axis 180 degrees apart in a portion of the outer peripheral surface of the operating member 70 located rearward of the cam flange 71. A step portion 75 facing rearward is formed on the outer peripheral surface of the operation member 70 behind the through hole 74, and a fitting projection 76 is formed behind the step portion 75. When the holding member 6 is attached to the rear end portion of the operating member 70, the fitting projection 76 is fitted into an opening provided in the holding member 6.

Fig. 15 is a perspective view of the rotor 80. The rotor 80 is disposed so that the upper side in fig. 15 is the rear side of the writing instrument 1 in the assembled state of the writing instrument 1. The rotor 80 is a cylindrical member. A rotary cam support surface 81 formed complementarily to the rotary cam surface 72 of the operating member 70 is formed on the rear end surface of the rotor 80. The rotating cam bearing surface 81 cooperates with the rotating cam surface 72 of the operating member 70. Six protrusions 82 extending in the axial direction and arranged at equal intervals in the circumferential direction are formed on the outer circumferential surface of the rotor 80, and the rear end surfaces of the protrusions 82 constitute a 1 st inner cam 83. With the two adjacent projections 82, six locking grooves 84 extending in the front-rear direction are formed in a divided manner. A locking portion 85 is formed on the rear end surface of each of the projections 82.

Fig. 16 is a perspective view of the brake lever 90. The brake lever 90 is disposed so that the upper side in fig. 16 is the rear side of the writing instrument 1 in the assembled state of the writing instrument 1. The brake lever 90 is a solid member. A small diameter portion 91 is formed at the rear end of the brake lever 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. Two rectangular projections 94 extending in the axial direction are formed on the outer peripheral surface of the large diameter portion 92 at 180 degrees apart around the central axis, and a restriction portion 95 is formed by dividing a rear part of the projection 94 into rectangular sections.

Fig. 17 is a perspective view of the knock ring 100. The knock ring 100 is disposed so that an upper portion in fig. 17 is a rear side of the writing instrument 1 in an assembled state of the writing instrument 1. The snap ring 100 is a cylindrical member. Two restricting projections 101 extending in the axial direction are formed on the inner peripheral surface of the snap ring 100 180 degrees apart around the central axis. Four 1 st outer protrusions 102 having a right-angled triangle shape are formed on the outer peripheral surface of the tip end portion of the knock ring 100. Two 1 st outer protrusions 102 are arranged 60 degrees apart around the central axis, and the corresponding other two 1 st outer protrusions 102 are arranged 180 degrees apart around the central axis. A 2 nd outer protrusion 103 having a parallelogram shape is formed behind each of the 1 st outer protrusions 102. The 1 st outer protrusion 102 and the 2 nd outer protrusion 103 constitute a 2 nd inner cam 104.

Next, the combination and arrangement of the components in the writing instrument 1 are explained with reference to fig. 1 to 7.

The separator 30 is screwed to the front barrel 2 by the male screw 36. The front end of the rear barrel 3 is inserted into the rear of the body 31 of the separator 30. At this time, since the annular projections 37 of the spacer 30 are fitted into the corresponding annular grooves 14 of the rear barrel 3, the rear barrel 3 is connected to the spacer 30, and further to the front barrel 2, so as to be unlikely to fall off and to be rotatable. The front spring 11 and the sleeve 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 body portion 31 of the spacer 30, and the rear end of the front spring 11 abuts against the front end surface of the sleeve member 40. The sleeve member 40 is movable in the front-rear direction and is biased rearward by the front spring 11. The T-shaped projections 13 of the rear barrel 3 are respectively received in the corresponding T-shaped recesses 41 of the sleeve member 40, thereby restricting the rotation of the sleeve member 40 about the center axis. Thus, when the rear barrel 3 is rotated with respect to the front barrel 2, the sleeve member 40 rotates together with the rear barrel 3.

The insertion portion 61 of the slide block 60 is inserted into the rear end portion of each of the three pen cores 5, whereby the pen cores 5 and the slide block 60 are connected. In this state, the pen cores 5 are inserted into the grooves between the rail portions 32 of the spacer 30, respectively, and can move in the front-rear direction. At this time, the slider 62 of the slide block 60 protrudes radially outward from the guide rail portion 32 of the spacer 30. The slider 62 is locked to the edge of the rail portion 32, and prevents the pen core 5 from falling out from between the rail portions 32. The slider 62, particularly the minute projection 63 of the slider 62, abuts on the 1 st cam surface 44 of the sleeve member 40. At this time, one of the sliders 62 of the three slider blocks 60 is disposed on the 1 st cam surface 44 of the cutout portion 43 of the sleeve member 40, and the remaining slider 62 is disposed on the 1 st cam surface 44 of the rear end surface of the sleeve member 40.

Since the sleeve member 40 is biased rearward by the front spring 11, the slide blocks 60 are also biased rearward through the sleeve member 40, and the rotary cam 50 is also biased rearward through the slide blocks 60. The rear end surface of the slider 62 abuts on the 2 nd cam surface 56 of the rotary cam 50 including the front end surface 27 of the inner cylinder 20, whereby the sleeve member 40 and the slider 60 are restricted from moving backward. Therefore, the sliders 62 of the slide block 60 are respectively disposed between the 1 st cam surface 44 and the 2 nd cam surface 56. The pawl 52 of the rotating cam 50 is movable in the front-rear direction in the recess 26 of the inner cylinder 20. At this time, the annular portion 51 of the rotating cam 50 slides along the inner circumferential surface of the inner tube 20.

The operation member 70 is disposed in the barrel 4 such that the 1 st inner protrusion 22 of the inner tube 20 is disposed in the corresponding guide groove 73. Thus, the operation member 70 can move in the front-rear direction within the barrel 4 without rotating during the pushing operation. The front end of the rear spring 10 is supported by the step portion 21 of the inner tube 20, and the rear end of the rear spring 10 abuts on the holding member 6. As a result, the holding member 6, and further the operating member 70 to which the holding member 6 is attached, is biased rearward by the rear spring 10. The rearward movement of the operating member 70 is restricted by the rear end surface of the cam flange 71 abutting against the front end surface of the 2 nd inner projection 24 of the inner cylinder 20.

A rotor 80 is rotatably disposed in a portion of the outer peripheral surface of the operating member 70 located forward of the cam flange 71 so as to be movable in the front-rear direction. At this time, the 1 st inner cam 83 of the rotor 80 is disposed to cooperate with the 1 st outer cam 23 of the inner tube 20. In the writing instrument 1 in the non-writing state (fig. 2), the tip end portion of the rotor 80 is inserted into the annular portion 51 of the rotary cam 50, and the tip end surface of the projection 82 of the rotor 80 abuts against the rear end surface of the annular portion 51 of the rotary cam 50. At this time, the rear end surface of the rotor 80, i.e., the rotating cam bearing surface 81, abuts against the rotating cam surface 72 of the operating member 70. As described above, since the rotary cam 50 is biased rearward by the front spring 11 via the slide block 60, the rotor 80 and the operation member 70 in contact therewith are also biased rearward.

The brake lever 90 is disposed inside the operating member 70 and thus the rotor 80. The brake lever 90 is movable in the front-rear direction within the operating member 70 by gravity. The forward movement of the brake lever 90 is restricted by abutting against the rear end surface of the spacer 30, that is, the rear end surface of the coupling portion 33. The rearward movement of the brake lever 90 is restricted by the tapered surface 93 of the brake lever 90 engaging with the inner surface of the operating member 70 (fig. 4).

A snap ring 100 is rotatably disposed around the through hole 74 of the operating member 70, and the snap ring 100 is movable in the front-rear direction integrally with the operating member 70. Specifically, the snap ring 100 is disposed between the cam flange 71 of the operating member 70 and the holding member 6 attached to the operating member 70, and restricts the movement in the front-rear direction with respect to the operating member 70. At this time, as will be described later with reference to fig. 19, since the regulating projections 101 of the snap ring 100 are respectively disposed in the corresponding through holes 74 of the operating member 70, the snap ring 100 is rotatable within a predetermined angular range in the through holes 74. The 2 nd inner cam 104 of the knock ring 100 is disposed to cooperate with the 2 nd outer cam 25 of the inner cylinder 20.

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

The writing instrument 1 is switched between the writing state and the non-writing state by performing a pushing operation of pushing the operation portion at the rear end of the writing instrument 1 forward against the biasing force of the rear spring 10 and the biasing force of the front spring 11, and the basic operation thereof will be described. The 1 st inner cam 83 of the rotor 80 and the 1 st outer cam 23 of the inner cylinder 20 cooperate with each other by the cooperation of the rotary cam surface 72 of the operating member 70 and the rotary cam support surface 81 of the rotor 80, thereby switching between the writing state and the non-writing state. The cooperative operation of these cams is similar to that of a conventional knock-type writing instrument, and therefore will be briefly described below.

In the non-writing state, the projections 82 of the rotor 80 are respectively disposed between the 1 st inner projections 22 of the inner tube 20, whereby the rotation of the rotor 80 is restricted. In other words, the 1 st inner protrusion 22 of the inner cylinder 20 is disposed in the locking groove 84 of the rotor 80. Thus, the rotation of the rotor 80 is restricted. At this time, the rotating cam surface 72 of the operating member 70 abuts the rotating cam bearing surface 81 of the rotor 80, but their phases are shifted from each other.

When the operation member 70 is moved forward by the pushing operation, the rotor 80 is pushed by the cam flange 71 and moved forward. When the rotor 80 moves forward, the slide block 60 provided with the slider 62 and the sleeve member 40 disposed in the notch portion 43 of the sleeve member 40 are pushed by the pawl portion 52 and move forward. As a result, the cartridge 5 connected to the slide block 60 protrudes from the barrel 4.

When the rotor 80 moves forward and the rear end of the projection 82 passes the front end of the 1 st inner projection 22 of the inner cylinder 20 in the forward-backward direction, the restriction of the rotation of the rotor 80 is released. At this moment, a component force in the circumferential direction is applied to restore the phase difference between the rotating cam surface 72 of the operating member 70 and the rotating cam bearing surface 81 of the rotor 80, and the rotor 80 is slightly rotated by the component force.

Next, when the knock operation is stopped, the slide block 60, the rotary cam 50, the rotor 80, and the operating member 70 are slightly moved rearward via the sleeve member 40 by the urging force of the front spring 11. At this time, the 1 st inner cam 83 of the rotor 80 and the 1 st outer cam 23 of the inner cylinder 20 cooperate to further rotate the rotor 80. That is, the inclined surface 22a of the 1 st inner protrusion 22 of the inner tube 20, which is inclined in the same direction as each other, abuts against the rear end surface of the protrusion 82 of the rotor 80 to act a component force in the circumferential direction, and the rotor 80 is further slightly rotated by the component force. By this rotation, the phases of the rotating cam surface 72 of the operating member 70 and the rotating cam bearing surface 81 of the rotor 80 are shifted again. The rotation and rearward movement of the rotor 80 are restricted by locking the 1 st inner protrusion 22 of the inner tube 20 with the locking portion 85 of the rotor 80. As a result, the pen core 5 is maintained in a state of protruding from the barrel 4, and the writing instrument 1 is brought into a writing state.

The pressing operation is performed again to change the writing state to the non-writing state. When the operating member 70 is moved forward by the pushing operation, the rotor 80 is pushed by the cam flange 71 and moved forward. When the rotor 80 moves forward and the rear end of the projection 82 passes the front end of the 1 st inner projection 22 of the inner cylinder 20 in the forward-backward direction, the restriction of the rotation of the rotor 80 is released. At this moment, a component force in the circumferential direction is applied to restore the phase difference between the rotating cam surface 72 of the operating member 70 and the rotating cam bearing surface 81 of the rotor 80, and the rotor 80 is slightly rotated by the component force.

Next, when the knock operation is stopped, the slide block 60, the rotary cam 50, the rotor 80, and the operating member 70 are slightly moved rearward via the sleeve member 40 by the urging force of the front spring 11. At this time, the 1 st inner cam 83 of the rotor 80 and the 1 st outer cam 23 of the inner cylinder 20 cooperate to further rotate the rotor 80. That is, the inclined surface 22a of the 1 st inner protrusion 22 of the inner tube 20, which is inclined surfaces inclined in the same direction, abuts against the rear end surface of the protrusion 82 of the rotor 80 to apply a component force in the circumferential direction, and the component force slightly rotates the rotor 80. By this rotation, the phase between the rotating cam surface 72 of the operating member 70 and the rotating cam bearing surface 81 of the rotor 80 is shifted again. The projections 82 of the rotor 80 are arranged again between the 1 st inner projections 22 of the inner tube 20, thereby restricting the rotation of the rotor 80. The backward movement of the rotor 80 is restricted by the cam flange 71 of the operating member 70. By moving the rotor 80 rearward, the sleeve member 40, the slide block 60, and the rotary cam 50 biased by the front spring 11 also move rearward. As a result, the pen core 5 is inserted into the barrel 4, and the writing instrument 1 is set to a non-writing state.

The above-described knock operation for switching between the writing state and the non-writing state is performed in a state where the tip of the writing instrument 1 is directed downward. In addition, the knock operation cannot be performed in a state where the tip of the writing instrument 1 is directed upward. That is, even if the operation portion is pushed forward, the movement of the operation member 70 is prevented, and the operation member 70 cannot be moved forward. This point will be explained below.

Fig. 18 is a schematic diagram illustrating an operation of the knock ring 100. Fig. 18 shows a positional relationship of the 2 nd inner cam 104 of the snap ring 100, that is, a positional relationship between the 2 nd inner protrusion 24 of the inner tube 20 and the 1 st outer protrusion 102 and the 2 nd outer protrusion 103 of the snap ring 100, in a case where the 2 nd outer cam 25 is expanded in the circumferential direction. 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. Fig. 18 (a) shows a state before the knock operation is performed, fig. 18 (B) shows a state immediately after the operation section starts moving forward by the knock operation, fig. 18 (C) shows a state where the operation section has moved forward by the knock operation, and fig. 18 (D) shows a state immediately before the operation section is returned to the original position by stopping the knock operation.

Referring to fig. 18 (a), before the knock operation is performed, the 2 nd inner protrusion 24 of the inner cylinder 20 is disposed in front of the 2 nd outer protrusion 103 of the knock ring 100. When the knock 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 2 nd outer cam 25 of the inner cylinder 20 and the 2 nd inner cam 104 of the knock ring 100 cooperate to rotate the knock ring 100. That is, the inclined surface 24a of the 2 nd inner protrusion 24 of the inner tube 20, which has inclined surfaces inclined in the same direction, abuts against the distal end surface of the 2 nd outer protrusion 103 of the knock ring 100, and the knock ring 100 rotates while moving forward by applying a component force in the circumferential direction (fig. 18B). When the operating member 70 is further moved forward, the 2 nd inner projection 24 of the inner cylinder 20 passes by the 2 nd outer projection 103, and the knock ring 100 and thus the operating member 70 can be sufficiently moved forward (fig. 18C), and the knock operation can be performed.

When the knock operation is stopped from the state shown in fig. 18 (C), the operation member 70 moves backward relative to the inner cylinder 20 by the biasing force of the rear spring 10, and therefore the knock ring 100 also moves backward. At this time, the 2 nd outer cam 25 of the inner cylinder 20 and the 2 nd inner cam 104 of the knock ring 100 cooperate to rotate the knock ring 100 in the opposite direction to the previous one. That is, the partial inclined surface 24b of the 2 nd inner projection 24 of the inner tube 20, which has inclined surfaces inclined in the same direction, abuts against the rear end surface of the 1 st outer projection 102 of the knock ring 100, and a component force in the circumferential direction acts to rotate the knock ring 100 while retreating ((D) of fig. 18). As a result, the knock ring 100 and the operation member 70 return to their original positions (fig. 18 a).

As described above, in the state where the tip end of the writing instrument 1 is directed downward, the knock ring 100 is rotated in accordance with the knock operation, and thus the forward movement of the operation member 70, i.e., the operation portion, is not prevented and the knock operation is enabled. In addition, since the rotation of the knock ring 100 is restricted by the brake lever 90 in a state where the tip end of the writing instrument 1 is directed upward, the forward movement of the operation portion is prevented and the knock operation cannot be performed. Such a snap lock mechanism is described with reference to fig. 19.

Fig. 19 is a cross-sectional view for explaining the operation of the brake lever 90. Fig. 19 (a) is a cross-sectional view taken along line a-a of fig. 3 in a state where the tip of the writing instrument 1 is directed downward, and fig. 19 (B) is a cross-sectional view taken along line B-B of fig. 4 in a state where the tip of the writing instrument 1 is directed upward.

As shown in fig. 19 (a), in a state where the tip of the writing instrument 1 is directed downward, the regulating protrusions 101 of the knock ring 100 are disposed in the through holes 74 of the operating member 70. In fig. 19 (a), the restriction protrusion 101 is located near one end edge of the through hole 74 in the state before the pressing operation, as in fig. 18 (a). Therefore, the knock ring 100 can rotate within a predetermined angular range within a range in which the restricting projection 101 is restricted from the end edge of the through hole 74.

As shown in fig. 19 (B), in a state where the tip of the writing instrument 1 is directed upward, the regulating protrusions 101 of the knock ring 100 are disposed in the through holes 74 of the operating member 70, respectively, but the regulating portions 95 are disposed so as to fill the gaps of the through holes 74. That is, when the front end of the writing instrument 1 is directed upward, the brake lever 90 moves rearward by gravity. Thus, the brake lever 90 is further inserted into the operating member 70, and the restricting portion 95 is inserted into the gap of the through hole 74. As a result, the restricting projection 101 of the snap ring 100 is locked with the restricting portion 95 of the brake lever 90, and the rotation of the snap ring 100 is restricted.

When the knock ring 100 cannot be rotated, as described with reference to fig. 18 (B), the knock ring 100 does not rotate even if the inclined surface 24a of the 2 nd inner projection 24 of the inner tube 20 abuts against the tip end surface of the 2 nd outer projection 103 of the knock ring 100. As a result, the 2 nd inner protrusion 24 of the inner tube 20 is engaged with the 2 nd outer protrusion 103 of the knock ring 100, and further forward movement of the operation member 70 is prevented. Therefore, in a state where the tip end of the writing instrument 1 is directed upward, the forward movement of the operation portion is prevented, and the pressing operation cannot be performed.

When the front end of the writing instrument 1 is turned from the upward state to the downward state, the brake lever 90 moves forward, and the rotation of the knock ring 100 is not restricted. As a result, the pressing operation can be performed again.

In the writing instrument 1, since the movement of the operation portion in the forward direction is prevented in the state where the front end is directed upward, for example, when the erasing member 7 is used to erase the handwriting of the writing instrument 1, a smooth wiping operation can be performed. That is, even if the writing tool 1 is turned and the operation portion is pressed against the writing surface to perform the rubbing operation, the operation portion does not shake. According to the writing instrument 1, a smooth rubbing action can be realized with a simpler mechanism than in the past.

For example, a conventional knock lock mechanism described in patent document 1 (japanese patent application laid-open No. 2016-. In contrast, the knock lock mechanism of the writing instrument 1 includes a brake lever 90 and a knock ring 100. Thus, the members responsible for movement and rotation are separated in such a way that the brake lever 90 only moves under the influence of gravity and the snap ring 100 only rotates. As a result, the knock lock mechanism of the writing instrument 1 can be made shorter in overall length than the knock lock mechanism of patent document 1, and can be designed more freely in the shape of components of the internal mechanism, such as the vicinity of the inner peripheral surface of the barrel, and in the location where the components are disposed.

The braking lever may be a braking member having any shape as long as it can move in the front-rear direction in the barrel by gravity. The knock ring may have a C-shape that is not completely annular, and may be a rotating member having any shape as long as it can move together with the operation portion and rotate around the central axis. When the front end of the barrel is directed upward, the stopper member moves rearward, the rotation of the rotary member is restricted, and the rotary member is locked with the locking portion, whereby the forward movement of the operation portion is prevented.

Further, when the writing instrument 1 is erroneously dropped in a state where the tip end of the writing instrument 1 is directed upward, a strong impact in the axial direction is applied to the operation portion. At this time, the inclined surface 24a of the 2 nd inner projection 24 of the inner tube 20 collides with the tip surface of the 2 nd outer projection 103 of the snap ring 100, and the 2 nd inner projection 24 is deformed so as to swell in the circumferential direction. Then, the deformed 2 nd inner protrusion 24 may not pass between the adjacent 2 nd outer protrusions 103 of the snap ring 100 as shown in fig. 18 (B), and the snap operation may not be performed. Even if the deformed 2 nd inner projection 24 passes between the adjacent 2 nd outer projections 103 of the knock ring 100, the deformed 2 nd inner projection 24 may be caught between the 2 nd outer projections 103, and the operation portion may not be returned to the original position. This point will be described with reference to fig. 20.

Fig. 20 is another schematic diagram illustrating the operation of the knock ring 100. Fig. 20 is the same view as 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 snap ring 100 shown in fig. 20 is formed such that the 2 nd outer protrusion 103 corresponding to the 2 nd inner protrusion 24 passing between the adjacent 2 nd outer protrusions 103, that is, the 2 nd outer protrusion 103 on the right side in the drawing, among the adjacent 2 nd outer protrusions 103 is shorter in the axial direction. That is, the distal end surface of the 2 nd outer protrusion 103 on the right side in the drawing is formed to be disposed rearward of the distal end surface of the other 2 nd outer protrusion 103.

Fig. 20 (a) shows the moment when the rear end surface of the 2 nd inner protrusion 24 of the inner tube 20, which does not pass between the adjacent 2 nd outer protrusions 103, collides with the front end surface of the corresponding 2 nd outer protrusion 103 of the knock ring 100 due to the falling of the writing instrument 1. At this time, the other 2 nd inner projection 24 of the inner tube 20 is disposed rearward of the distal end surface of the corresponding 2 nd outer projection 103 of the knock ring 100, and therefore does not collide with the 2 nd outer projection 103. In fig. 20 (B), as a result of the collision, the 2 nd inner protrusion 24 of the inner tube 20, which does not pass between the adjacent 2 nd outer protrusions 103, has a deformed portion 24 c. At this time, since the other 2 nd inner protrusion 24 of the inner tube 20 is not deformed, it can pass through between the adjacent 2 nd outer protrusions 103 without affecting the knock operation.

In addition, in a normal knock operation, when the rear end surface of the 2 nd inner projection 24 of the inner tube 20 abuts against the front end surface of the 2 nd outer projection 103 of the knock ring 100, the 2 nd inner projection 24 of the inner tube 20 and the 2 nd outer projection 103 of the knock ring 100 are engaged with each other, and the knock ring 100 may not be rotated. This point will be described with reference to fig. 21.

Fig. 21 is another schematic diagram illustrating the operation of the knock ring 100. Fig. 21 is the same view as fig. 18, and 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 2 nd outer protrusion 103 of the snap ring 100, particularly, the angle α of the acute angle portion of the tip of the 2 nd outer protrusion 103 on the left side in the drawing is set to be in the range of 45 degrees to 90 degrees, whereby the 2 nd inner protrusion 24 of the inner tube 20 and the 2 nd outer protrusion 103 of the snap ring 100 can be prevented from being unexpectedly engaged with each other.

As described above, the operation member 70, the rotor 80, and the rotary cam 50 are moved forward by the pushing operation. When the rotary cam 50 moves forward, the slide block 60 provided with the slider 62 and the sleeve member 40 disposed in the cutout portion 43 of the sleeve member 40 are pushed by the pawl portion 52 and move forward. As a result, the writing portion 5a of the pen core 5 connected to the slide block 60 protrudes from the barrel 4. The operation of projecting the predetermined pen core 5 will be described with reference to fig. 22.

Fig. 22 is a schematic diagram illustrating the operation of the pen core in the knock operation. As described above, the sliders 62 of the slide block 60 are respectively disposed between the 1 st cam surface 44 and the 2 nd cam surface 56, and are shown as being spread in the circumferential direction in fig. 22, and therefore are connected to each other on the left and right in the drawings. The slide block 60 cooperates with the 1 st cam surface 44 and the 2 nd cam surface 56, respectively. The o mark marked on one of the three slider blocks 60 is a symbol drawn for the convenience of specifying the slider block 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. Fig. 22 (a) shows the sleeve member 40, the rotary cam 50, and the slide block 60 in the non-writing state of the writing instrument 1, fig. 22 (B) shows the sleeve member 40, the rotary cam 50, and the slide block 60 immediately after the start of the knock operation, and fig. 22 (C) shows the sleeve member 40, the rotary cam 50, and the slide block 60 in the writing state of the writing instrument 1. Fig. 22 schematically shows a T-shaped projection 13 provided on the inner peripheral surface of the rear barrel 3.

When the knock operation is performed from the state shown in fig. 22 (a), the operating member 70 is moved forward, so that the rotating cam 50 is also moved forward, and the sliding block 60 and the sleeve member 40, which are disposed in the notch portion 43 and marked with the o mark, move forward. At this time, the remaining two slide blocks 60 are engaged with the T-shaped projections 13 provided on the inner peripheral surface of the relatively stationary rear barrel 3 (fig. 22B). Therefore, the 1 st cam surface 44 can be said to include the rear end surface of the T-shaped projection 13. When the rotary cam 50 further moves, as described above, the 1 st inner cam 83 of the rotor 80 and the 1 st outer cam 23 of the inner cylinder 20 cooperate with each other, and the writing instrument 1 enters the writing state ((C) of fig. 22). At this time, the remaining two slide blocks 60 are locked to the T-shaped projection 13 provided on the inner peripheral surface of the rear barrel 3, and therefore do not move forward.

If the T-shaped projection 13 is not provided, the writing lead 5 other than the writing lead 5 protruding from the barrel 4 moves forward by gravity. Then, the plurality of refills 5 are gathered at the tapered portion of the front end of the front barrel 2, and the movement of the refills 5 to be protruded may be hindered. Then, in the writing instrument 1, the T-shaped projection 13 is provided, and the other pen core 5 is locked with the T-shaped projection, thereby restricting the unnecessary advance of the other pen core 5. Therefore, the T-shaped projection 13 can have any shape as long as it can lock the lead 5.

As is clear from fig. 22, the writing tool 1 is set to the writing state by the knock operation in which the pen core 5 connected to the relatively advancing slide block 60 among the three pen cores 5 protrudes from the distal end opening of the barrel 4. Therefore, in the non-writing state of the writing instrument 1, the writing portion 5a of the pen core 5 which is relatively advanced is disposed in the vicinity of the distal end opening of the barrel 4, and thus the pen core 5 can be made to project to a writing state with a smaller pressing operation amount, i.e., a smaller pressing stroke. Further, in the knock operation, the 2 nd cam surface 56 of the rotating cam 50 advances and presses the slide block 60, thereby suppressing the rattling between the members. Further, the rotary cam 50, particularly the claw portion 52, can be made relatively large, and the strength can be increased.

Fig. 23 is a schematic diagram for explaining a switching operation of the pen core 5 which can be inserted and retracted, that is, an operation for changing the pen core 5 for writing. Fig. 23 is the same view as fig. 22, and 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 barrel 2. The inner cylinder 20, the sleeve member 40, the rotary cam 50, and the rear barrel 3 are rotatable with respect to the front barrel 2, and constitute a rotation selecting member. In other words, the front barrel 2 is rotatable with respect to the rear barrel 3.

In fig. 23, for convenience of explanation, since the rotation of the rear barrel 3 with respect to the front barrel 2 is based on the rear barrel 3, only the slide block 60 moves in the left-right direction in fig. 23 according to the rotation of the rear barrel 3. In practice, only the slide block 60 moves in the front-rear direction in the groove between the guide rail portions 32 of the spacer 30. For convenience of explanation, the three slide blocks 60 are divided into the slide block 60A, the slide block B, and the slide block 60C. As described above, in the knock operation, the pen core 5 connected to the slide block 60 disposed in the notch 43 of the sleeve member 40, that is, the pen core 5 disposed at the selected position is pushed by the claw portion 52 and protrudes from the barrel 4. Therefore, by changing the pen core 5 arranged at the selected position, a desired pen core 5 can be made to protrude into or retract into. For convenience of explanation, the rear barrel 3 is rotatable with respect to the front barrel 2.

Fig. 23 (a) shows a state in which the slider 60A is disposed at the forward position in the writing instrument 1 in the non-writing state. When the knock operation is performed in this state, the pen core 5 connected to the slide block 60A is in the writing state as described above. At this time, the

other slide blocks

60B and 60C are locked with the T-shaped projection 13 provided on the inner peripheral surface of the rear barrel 3 as described with reference to fig. 22, and are restricted from moving forward.

In the state shown in fig. 23 (a), when the rear barrel 3 is rotated clockwise with respect to the front barrel 2 as viewed from the rear of the writing instrument 1, the slide blocks 60 are moved relative to each other in the rightward direction in the drawing. At this time, the slide block 60A disposed at the advanced position moves rearward along the inclined surface of the 1 st cam surface 44 in accordance with the rotation of the rear barrel 3, that is, the rotation of the sleeve member 40, and the slide block 60B jumps over the raised portion 42 against the biasing force of the front spring 11 (fig. 23B). By stepping the slide block 60B over the bump portion 42, the sleeve member 40 moves forward by an amount corresponding to the height of the bump portion 42 compared to the state shown in fig. 23 (a).

When the rear barrel 3 is rotated, the slide block 60B moves in the circumferential direction along the protruding portion 42, and the slide block 60C moves forward along the end surface 55 of the rotary cam 50 ((C) of fig. 23). Next, at the moment when the slide block 60B exceeds the end of the protruding portion 42, the sleeve member 40, which has moved forward by the amount corresponding to the height of the protruding portion 42, moves rearward instantaneously by the urging force of the front spring 11 (fig. 23 (D)). At this time, the slide block 60B collides with the rear end surface of the sleeve member 40. At the same time, the slide block 60C collides with the end face of the cutout portion 43 of the sleeve member 40. At the same time, the slide block 60A collides with the front end surface 27 of the inner tube 20. As a result, the slider 60C is disposed in the notch 43 of the sleeve member 40, and the switching of the pen core 5 is completed ((E) of fig. 23). Since these collisions are performed substantially simultaneously, the user who has rotated the rear barrel 3 can feel the impact and the click sound caused by the impact, and can recognize that the switching operation of the pen core 5 which can be inserted and extracted is completed. The ridge portion 42 may be omitted.

The torque required to start rotation of the rear barrel 3 for switching the retractable lead 5, that is, the starting torque, can be changed to a desired value by changing the height of the raised portion 42 which is raised in a step shape, the shape of the step-shaped portion, and the like. By appropriately adjusting the starting torque in consideration of the frictional resistance and the like accompanying the movement of the slide block 60, when the pen is rotated by applying a torque equal to or greater than the starting torque, the pen can be instantaneously switched to the adjacent pen core 5 by the subsequent inertial force.

Fig. 24 is a schematic diagram illustrating the operation of the pen core 5 in the knock operation according to another embodiment. Fig. 24 is the same view as 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 length of the pawl portion 152 of the rotary cam 150 in the axial direction is set so that the distal end surface of the pawl portion 152 is aligned with the distal end surface 27 of the inner tube 20. In this case, the pen core 5 located at the selected position is not the pen core 5 connected to the slide block 60 disposed at the forward position, that is, the cutout 43, but the pen core 5 connected to the following slide block 60: the slide block 60 is disposed at a position facing the pawl portion 152 of the rotary cam 150 in the axial direction. In the present embodiment, when the rear barrel 3 is rotated, the slide block 60 does not contact the rotary cam 150, and therefore, the switching of the pen core 5 which can be inserted and extracted can be performed more smoothly.

In the above embodiment, the rotation of the rear barrel 3 with respect to the front barrel 2, that is, the rotation of the rotation selection member is limited to the range of a predetermined angle. That is, as shown in fig. 2, in the writing instrument 1 in the non-writing state, the leading end portion of the guide projection 53 of the rotating cam 50 can be disposed outside the coupling piece 33a of the spacer 30. In other words, the coupling piece 33a of the spacer 30 does not interfere with the guide projection 53 of the rotating cam 50. In this state, when the rear barrel 3 is rotated in one direction with respect to the front barrel 2, the rotation restricting piece 33b of the spacer 30 abuts on the guide projection 53 of the rotation cam 50, and the rotation of the rear barrel 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 abuts on the guide projection 53 of the rotating cam 50. When the rear barrel 3 is rotated toward the other side with respect to the front barrel 2, the other side surface 33c of the rotation restricting piece 33b of the spacer 30 in the circumferential direction abuts on the guide projection 53 of the rotation cam 50. Therefore, the rotation of the rotation selecting member can be restricted to a range of a predetermined angle. At this time, for example, from the state shown in fig. 23 (a), the rear barrel 3 is rotated by 120 degrees to be changed to the state shown in fig. 23 (E) in which the slide block 60C is disposed in the notch portion 43 of the sleeve member 40, and thereafter, the rear barrel 3 cannot be further rotated. Therefore, in order to dispose the slide block 60B in the notch 43 of the sleeve member 40, the rear barrel 3 needs to be rotated by 240 degrees in the opposite direction. Further, the rotation of the rotation selecting member may be restricted within a range of a predetermined angle by providing a locking mechanism in the plurality of annular protrusions 37 of the separator 30, the plurality of annular grooves 14 of the rear barrel 3, or the like.

By limiting the rotatable angle of the rear barrel 3 to a predetermined range (i.e., 240 degrees), the pen core 5 protruding by the pressing operation at that time can be recognized at a glance. That is, in the state shown in fig. 23 (a), as shown in fig. 1, the clip 28 configured as the inner cylinder 20 is aligned with the marker 35 disposed on the display member 12. When the clip 28 is aligned with the marker 35, the pen core 5 connected to the slide block 60A is protruded by a knock operation. Since the marker 35 moves integrally with the front barrel 2, the positional relationship between the clip 28 and the marker 35 changes according to the rotational direction of the front barrel 2. Therefore, by observing the positional relationship between the clip and the marker 35, it is possible to determine which pen core 5 is located at the selected position and to set the writing state by the knock operation. At this time, the marking portion 35 and the two triangular marks (fig. 1) may be colored by the color of the ink of the pen core 5, so that the discrimination can be made more easily.

The front barrel 2 and the rear barrel 3 can be relatively rotated only when the writing instrument 1 is in a non-writing state. In other words, the rotation selecting member can be rotated only when the writing instrument 1 is in the non-writing state. That is, in the writing instrument 1 in the writing state, as shown in fig. 22 (C), the rotating cam 50 moves forward. At this time, the rotating cam 50 presses the corresponding slide block 60 forward, and the guide projection 53 of the rotating cam 50 is inserted into the groove between the guide rail portions 32 of the spacer 30. Therefore, even if the rotation selecting member is intended to be rotated, the rotation is restricted by the engagement between the guide projection 53 of the rotating cam 50 and the guide rail portion 32, and the rotation selecting member cannot be rotated. Therefore, when the writing instrument 1 is in the writing state, the front barrel 2 cannot be rotated with respect to the rear barrel 3. Therefore, it is possible to prevent a malfunction in which the rotary selector member is unintentionally rotated to change the pen core 5 during writing. On the other hand, when the writing instrument 1 is in the non-writing state, the guide projection 53 of the rotating cam 50 is disposed rearward of the guide rail portion 32 and is not locked to the guide rail portion 32, and therefore the rotation selecting member can be rotated.

Even if the writing instrument 1 is set from the writing state to the non-writing state by the knock operation, the same pen core 5 is located at the selected position unless the rotation selection member is rotated as described with reference to fig. 23. Therefore, for example, after writing in black, the writing pen is set to the non-writing state by performing a pressing operation, and when writing in black again, the black pen core 5 can be set to the writing state again by performing a pressing operation only on a single operation portion without performing selection of an operation portion corresponding to each pen core or the like. That is, it is not necessary to search for a predetermined operation portion from among a plurality of operation portions each time a desired pen core 5 is protruded, and it is possible to easily perform repeated loading and unloading of the same pen core 5 by performing a pressing operation on a single operation portion. On the other hand, when the writing lead 5 to be set in the writing state is switched by the knock operation, the switching can be easily performed by rotating the rotary selector around the axis as described above.

Further, since the slide blocks 60 move in the front-rear direction by rotating the rotation selecting member about the axis, it is not necessary to provide a plurality of springs for individually biasing the pen cores 5 connected to the slide blocks 60. That is, a multi-core knock type writing instrument can be realized by the single front spring 11. As a result, the writing instrument 1 can be configured to have a simple structure while reducing the ratio of the total length of the loading and unloading mechanism and the lead selection mechanism in the axial direction and making the outer diameter of the writing instrument 1 smaller. Further, by disposing the single front spring 11 outside the spacer 30, that is, in the vicinity of the inner circumferential surface of the barrel 4, the cartridge 5 can be prevented from being damaged by contact with the front spring 11. That is, since the guide rail portion 32 of the spacer 30 covers most of the outer circumferential surface of the pen core 5 facing radially outward, the pen core 5 does not contact the front spring 11. Further, since a plurality of operation portions are not disposed on the outer peripheral surface of the writing instrument 1, there are few irregularities, and it is possible to print a pattern and perform decoration.

An opening may be provided in the side surface of the barrel 4 or the barrel 4 may be made transparent or translucent so that which refill 5 is in the writing state by the pressing operation, that is, which refill 5 is located at the selected position can be determined. Specifically, when the opening is provided in the side surface of the barrel 4, the opening may be formed in a portion of the side surface of the barrel 4 corresponding to each slide block 60 so that the slide block 60 can be visually recognized from the opening only when the slide block is located at the forward position. The slider 60 may be colored in the same color as the writing color of the inserted pen core 5.

In the above-described embodiment, the writing instrument 1 has three writing cores 5, but two or four or more writing cores may be used, and a double-type writing instrument in which one writing core is another type of writing core such as a pointed pencil, a marker pen, a touch pen, an eraser, or a friction body instead of the writing core for a ballpoint pen may be used. Further, the writing instrument 1 is provided with an erasing member 7 for erasing the handwriting of the writing instrument 1 at the rear end portion thereof, but in addition to or instead of this, an erasing member may be provided at a different portion of the writing instrument 1. For example, the removing member may be provided at a part of the front barrel 2, for example, at the front end portion, or may be provided at the clip.

In the above-described embodiments, specific examples of the projection, the groove, the cam structure, and the like are shown, but the same effects can be obtained by forming the projection, the groove, the cam structure, and the like from different numbers, shapes, or from separate members.

At least one of the pen cores 5 of the above-described embodiment may be a pen core in which a thermochromic ink containing a thermochromic coloring material is stored. In this case, the writing instrument 1 is a thermochromic writing instrument, and the handwriting of the writing instrument 1 can be thermochromic by frictional heat generated when a frictional body serving as an erasing member is rubbed.

Here, the thermochromic ink refers to an ink having the following properties: the color tone is maintained at a predetermined hue (1 st color) at normal temperature (e.g., 25 ℃), is changed to another hue (2 nd color) when the temperature is raised to a predetermined temperature (e.g., 60 ℃), and is then restored to the original hue (1 st color) when the temperature is cooled to a predetermined temperature (e.g., -5 ℃). The 2 nd color is colorless for the writing instrument 1 using the thermochromic ink, and is colorless for warming up the trace written in the 1 st color (e.g., red), and is referred to herein as "erasing". Therefore, the writing surface on which the line is written is rubbed by the friction body to generate frictional heat, thereby changing the line to be colorless, i.e., erasing the line. Of these, it is needless to say that the 2 nd color may be a color other than colorless.

The thermochromic microcapsular pigment material as the thermochromic coloring material is not particularly limited as long as it is a pigment that changes color by heat such as frictional heat, and examples thereof include pigments having functions of changing color from colored to colorless, from colored to colored, and from colorless to colored.

The leuco dye that can be used is not particularly limited as long as it functions as an electron donating dye and a color former. Specifically, from the viewpoint of obtaining an ink having excellent color development characteristics, conventionally known materials such as triphenylmethane-based, spiropyran-based, fluorane-based, diphenylmethane-based, rhodamine lactam-based, indolphthalein-based, and leuco auramine-based materials can be used alone (one type) or in a mixture of two or more types (hereinafter, simply referred to as "at least one type").

Specific examples thereof include 6- (dimethylamino) -3, 3-bis [4- (dimethylamino) phenyl ] -1(3H) -isobenzofuranone, 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, and mixtures thereof, 3-dibutylamino-6-methyl-7-anilinofluoran, 3-diethylamino-6-methyl-7-xylenylaminofluoran, 2- (2-chloroanilino) -6-dibutylaminofluoran, 3, 6-dimethoxyfluoran, 3, 6-di-N-butoxyfluoran, 1, 2-benzo-6-diethylaminofluoran, 1, 2-benzo-6-dibutylaminofluoran, 1, 2-benzo-6-ethylisopentylaminofluoran, 2-methyl-6- (N-p-tolyl-N-ethylamino) fluoran, 2-chloro-6-dibutylaminofluoran, 3, 6-dimethoxyfluoran, 3, 6-di-N-butoxyfluoran, 1, 2-benzo-6-ethylidenefluoran, 1, 2-methyl-6- (N-p-tolyl-N-ethylamino) fluoran, a, 2- (N-phenyl-N-methylamino) -6- (N-p-tolyl-N-ethylamino) fluoran, 2- (3 ' -trifluoromethylanilino) -6-diethylaminofluoran, 3-chloro-6-cyclohexylaminofluoran, 2-methyl-6-cyclohexylaminofluoran, 3-di (N-butyl) amino-6-methoxy-7-anilinofluoran, 3, 6-bis (diphenylamino) fluoran, methyl-3 ', 6 ' -bis (diphenylamino) fluoran, chloro-3 ', 6 ' -bis (diphenylamino) fluoran, 3-methoxy-4-dodecyloxystyrenylquinoline, and the like.

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

The color-developing agent that can be used is a component having the ability to develop the above leuco dye, and examples thereof include phenolic resin compounds, salicylic acid metal chlorides, salicylic acid resin metal salt compounds, and solid acid compounds.

Specific examples thereof include o-cresol, t-butylcatechol, nonylphenol, n-octylphenol, n-dodecylphenol, n-stearylphenol, p-chlorophenol, p-bromophenol, o-phenylphenol, hexafluorobisphenol, n-butyl p-hydroxybenzoate, n-octyl p-hydroxybenzoate, resorcinol, dodecyl gallate, 2-bis (4 '-hydroxyphenyl) propane, 4-dihydroxydiphenylsulfone, 1-bis (4' -hydroxyphenyl) ethane, 2-bis (4 '-hydroxy-3-methylphenyl) propane, bis (4-hydroxyphenyl) sulfide, 1-phenyl-1, 1-bis (4' -hydroxyphenyl) ethane, 1-bis (4 '-hydroxyphenyl) -3-methylbutane, n-dodecylphenol, n-stearylphenol, p-chlorophenol, p-bromophenol, o-phenylphenol, p-phenylphenol, o-phenylphenol, hexafluorobisphenol, n-butylparaben, n-octylphenol, resorcinol, dodecyl gallate, 2, bis (4' -hydroxyphenyl) propane, 1-bis (4 '-hydroxyphenyl) ethane, 1-bis (4' -hydroxyphenyl) -3-methylbutane, and the like, 1, 1-bis (4 ' -hydroxyphenyl) -2-methylpropane, 1-bis (4 ' -hydroxyphenyl) n-hexane, 1-bis (4 ' -hydroxyphenyl) n-heptane, 1-bis (4 ' -hydroxyphenyl) n-octane, 1-bis (4 ' -hydroxyphenyl) n-nonane, 1-bis (4 ' -hydroxyphenyl) n-decane, 1-bis (4 ' -hydroxyphenyl) n-dodecane, 2-bis (4 ' -hydroxyphenyl) butane, 2-bis (4 ' -hydroxyphenyl) ethylpropionate, 2-bis (4 ' -hydroxyphenyl) -4-methylpentane, 2-bis (4 ' -hydroxyphenyl) hexafluoropropane, 1-bis (4 ' -hydroxyphenyl) n-heptane, 1-bis (4 ' -hydroxyphenyl) n-octane, 1-bis (4 ' -hydroxyphenyl) n-nonane, 1-bis (4 ' -hydroxyphenyl) n-decane, 2-bis (4 ' -hydroxyphenyl) hexafluoropropane, 2-bis (4 ' -hydroxyphenyl) n-ethyl-nonane, 1-bis (4 ' -hydroxyphenyl) n-decane, 1-bis (4 ' -hydroxyphenyl) n-decane, 1-bis (4 ' -hydroxyphenyl) n-decane, 2-bis (4 ' -hydroxyphenyl) n-dodecane, 2, 2, 2-bis (4 '-hydroxyphenyl) n-heptane, 2-bis (4' -hydroxyphenyl) n-nonane, and the like.

The amount of the color-developing agent to be used may be arbitrarily selected depending on the desired color density, and is not particularly limited, but is preferably selected in the range of about 0.1 to 100 parts by mass per 1 part by mass of the above leuco dye.

The discoloration temperature adjuster that can be used is a substance that controls the discoloration temperature when the above leuco dye and color developer develop color. As the discoloration temperature adjuster that can be used, conventionally known adjusters can be used. Specific examples thereof include alcohols, esters, ketones, ethers, amides, azomethines, fatty acids, and hydrocarbons.

More specifically, bis (4-hydroxyphenyl) phenylmethane dicaprylate (C)₇H₁₅) Bis (4-hydroxyphenyl) phenylmethane dilaurate (C)₁₁H₂₃) Bis (4-hydroxyphenyl) phenylmethane dimyristate (C)₁₃H₂₇) Bis (4-hydroxy)Phenyl) phenylethane dimyristate acid ester (C)₁₃H₂₇) Bis (4-hydroxyphenyl) phenylmethane dipalmitate (C)₁₅H₃₀) Bis (4-hydroxyphenyl) phenylmethane behenate (C)₂₁H₄₃) Bis (4-hydroxyphenyl) phenylethyl hexylene dimyristate acid ester (C)₁₃H₂₇) And the like.

The amount of the discoloration temperature adjuster to be used may be appropriately selected depending on the desired hysteresis time, color density at the time of color development, and the like, and is not particularly limited, but it is generally preferably used in a range of about 1 part by mass to 100 parts by mass with respect to 1 part by mass of the leuco dye.

The thermochromic microcapsular pigment material can be produced by microencapsulating a thermochromic composition containing at least the leuco dye, the color developer, and the color-changing temperature adjuster into a material having an average particle diameter of 0.1 to 5 μm. Examples of microencapsulation methods include an interfacial polymerization method, an interfacial polycondensation method, an in-situ polymerization method, a liquid internal curing coating method, a phase separation method from an aqueous solution, a phase separation method from an organic solvent, a melt dispersion cooling method (japanese: melting dispersion cooling method), an air suspension coating method, a spray drying method, and the like, and can be appropriately selected depending on the application.

For example, in the case of a phase separation method from an aqueous solution, a leuco dye, a color developer, and a color-change temperature adjuster are heated and melted, then an emulsifier solution is added thereto, heated and stirred to disperse the leuco dye in an oil droplet state, and then, as a capsule film agent, a resin material such as an amino resin solution or an isocyanate resin solution is slowly added thereto, and then, the mixture is reacted and prepared, and then, the dispersion is filtered, whereby a desired thermochromic microcapsule pigment can be produced.

The contents of the leuco dye, the color-developing agent and the color-change temperature adjuster vary depending on the kind of the leuco dye, the color-developing agent and the color-change temperature adjuster used, a microencapsulation method and the like, and the color-developing agent is 0.1 to 100 and the color-change temperature adjuster is 1 to 100 in terms of mass ratio relative to 1 of the color. The capsule film agent is 0.1-1 by mass ratio relative to the capsule content.

The thermochromic microcapsular pigment material is preferably: by appropriately combining the types, amounts, and the like of the leuco dye, the color developer, and the color-change temperature adjuster, the color development temperature (for example, at least-20 ℃) and the color erasing temperature (for example, at least 60 ℃) of each color can be set to appropriate temperatures, and the color can be changed from colored to colorless by heat such as frictional heat.

The thermochromic microcapsular pigment material is preferably formed into a wall film of a polyurethane resin, a urea/polyurethane resin, an epoxy resin, or an amino resin, from the viewpoint of further improving the line density, storage stability, and writing properties. Examples of the urethane resin include compounds of isocyanate and polyol. Examples of the epoxy resin include compounds of epoxy resins and amines. Examples of the amino resin include melamine resin, urea resin, and benzoguanamine resin. The thickness of the wall film of the microcapsule coloring material can be appropriately determined depending on the required wall film strength and line drawing density.

The average particle diameter of the thermochromic microcapsular pigment material is preferably 0.1 to 5 μm, more preferably 0.3 to 3 μm, from the viewpoints of coloring property, color-developing property, easy decolorization, stability, fluidity in ink, suppression of adverse effects on writing property, compatibility with a photochromic microcapsular pigment material described later, and the like. Here, the "average particle diameter" defined herein is a value obtained by measuring the average particle diameter (50% diameter) (refractive index 1.8) using a particle size analyzer [ Microtrac (マイクロトラック) HRA 9320-X100 (manufactured by Nikkiso Co.) ].

If the average particle diameter is less than 0.2 μm, a sufficient line density cannot be obtained, while if it exceeds 5 μm, deterioration of writing property, reduction of dispersion stability of the thermochromic microcapsule pigment, and ink recovery due to vibration are liable to occur, which is not preferable. Further, the 90% diameter is 8 μm or less, preferably 6 μm or less. If the particle diameter is larger than a certain ratio, the influence tends to become more remarkable. Among them, although the microcapsule pigment having the above-mentioned average particle diameter range (0.1 μm to 5 μm) varies depending on the microencapsulation method, it can be prepared by appropriately combining stirring conditions in producing the microcapsule pigment when a phase separation method from an aqueous solution is employed.

The specific gravity of the thermochromic microcapsular pigment material is 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, the microcapsule pigment having a specific gravity of more than 1.3 is liable to cause ink return by vibration.

In addition to the thermochromic microcapsule pigment, the water-based ink composition for writing instruments may contain, as the rest, water as a solvent (tap water, purified water, distilled water, ion-exchanged water, purified water, etc.), and depending on the application of each writing instrument (for a ball point pen, a marker pen, etc.), a water-soluble organic solvent, a thickener, a lubricant, a rust preventive, an antiseptic, an antibacterial agent, or the like as appropriate within a range in which the effects thereof are not impaired.

Examples of the water-soluble organic solvent that can be used include glycols such as ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, polyethylene glycol, 3-butanediol, thiodiethylene glycol, and glycerin, ethylene glycol monomethyl ether, and diethylene glycol monomethyl ether, either singly or in combination.

Among them, glycerin is preferably used for the purpose of suppressing ink solidification in the writing portion due to ink recovery, and the amount added is preferably 1 to 10% by mass relative to the total amount of the ink. Although the mechanism of action of glycerin is unknown, it is presumed that glycerin has an effect of reducing the cohesive force with the pigment and ink components in a dry state.

As the thickener that can be used, for example, at least one selected from the group consisting of synthetic polymers, cellulose and polysaccharides is preferable. Specific examples thereof include gum arabic, tragacanth gum, guar gum, locust bean gum, alginic acid, carrageenan, gelatin, xanthan gum, welan gum, succinoglycan, diutan gum, dextran, methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose, starch glycolic acid and salts thereof, propylene glycol alginate, polyvinyl alcohol, polyvinylpyrrolidone, polyvinyl methyl ether, polyacrylic acid and salts thereof, carboxyvinyl polymer, polyethylene oxide, copolymer of vinyl acetate and polyvinylpyrrolidone, crosslinking type acrylic acid polymer and salts thereof, non-crosslinking type acrylic acid polymer and salts thereof, styrene-acrylic acid copolymer and salts thereof, and the like.

Among them, polysaccharides are preferably used. Polysaccharides tend to be less susceptible to the influence of vibration on fluidity due to their rheological properties, and thus troubles such as poor writing due to ink recovery are less likely to occur. In particular, xanthan gum is preferred because it is well balanced with other properties required for writing instrument inks.

Examples of the lubricant 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, alkylallyl sulfonates, derivatives of polyalkylene glycols, fluorine-based surfactants, polyether-modified silicones, and the like, which are also used as surface treatment agents for pigments. Examples of the rust inhibitor include benzotriazole, tolyltriazole, dicyclohexylammonium nitrite, and saponins. Examples of the preservative or antibacterial agent include phenol, sodium pyrithione (sodium omadine), sodium benzoate, benzimidazole-based compounds, and the like.

In producing the aqueous ink composition for a writing instrument, it can be obtained by a conventionally known method, for example, by: the aqueous components are mixed in predetermined amounts in addition to the thermochromic and photochromic microcapsule pigments, and the mixture is stirred and mixed by a stirrer such as a high-speed stirrer (japanese: ホモミキサー) or a disperser (japanese: ディスパー). Thereafter, if necessary, coarse particles in the ink composition may be removed by filtration or centrifugal separation.

The viscosity number of the aqueous ink composition for writing instruments is preferably: at 25 ℃ and a shear rate of 3.83/s, from 500 mPas to 2000 mPas, and at a shear rate of 383/s, from 20 mPas to 100 mPas. By setting the viscosity within the above range, an ink having good writing properties and stability with time can be obtained. Furthermore, it is preferable to use a compound of S ═ α Dn (wherein 1 > n > 0) (S is a shear)Stress (dyn/cm)²) D is the shear rate(s)^-1) And alpha is a non-Newtonian viscosity coefficient) is 0.2 to 0.6. Within the viscosity range and the non-newtonian viscosity index n is also within the range, so that the fluidity of the ink with respect to vibration can be appropriately set, and the occurrence of ink backflow can be prevented.

The surface tension of the aqueous ink composition for a writing instrument is 25 to 45mN/m, and more preferably 30 to 40 mN/m. Within this range, the balance between the inside of the pen tip and the wettability of the ink is moderate, and the occurrence of ink backflow can be prevented.

The ink follower may be disposed immediately behind the ink in the cartridge. The material constituting the follower can include at least a nonvolatile or nonvolatile organic solvent and a thickener. The nonvolatile or nonvolatile organic solvent used for the ink follower is used as the base oil of the ink follower, and for example, fluid paraffin can be used. As the fluid wax, mineral oil or chemically synthesized oil can be used, and as the chemically synthesized oil, polybutene, polyalphaolefin, ethylene alpha-olefin oligomer, or the like can be used.

Specific examples of the mineral oils that can be used include commercially available Diana Process Oil (ダイアナプロセスオイル) NS-100, PW-32, PW-90, NR-68, AH-58 (manufactured by Shiko corporation), and the like.

Specific examples of the polybutene that can be used include commercially available Nissan (ニッサン) polybutene 200N, polybutene 30N, polybutene 10N, polybutene 5N, polybutene 3N, polybutene 015N, polybutene 06N, polybutene 0N (manufactured by Nippon fat and oil Co., Ltd.), polybutene HV-15 (manufactured by Nippon petrochemicals Co., Ltd.), and 35R (manufactured by Shikko Co., Ltd.).

Specific polyalphaolefins that can be used include commercially available Barrel Process Oil (バーレルプロセスオイル), P-26, P-46, P-56, P-150, P-350, P-1500, P-2200, (P-10000, P-37500) (available from Sonmura Petroleum Co., Ltd.), and the like.

Specific ethylene alpha-olefin oligomers that can be used include, for example, commercially available Lucants (ルーカント) HC-10, HC-20, HC-100, HC-150, (HC-600, HC-2000) (manufactured by Mitsui Chemicals Co., Ltd.).

These nonvolatile or nonvolatile organic solvents can be used singly or in combination.

Examples of the thickener used for the ink follower include calcium salts of phosphoric acid esters, microsilica, block copolymers of polystyrene-polyethylene/butylene rubber-polystyrene, block copolymers of polystyrene-polyethylene/propylene rubber-polystyrene, hydrogenated styrene-butadiene rubber, block copolymers of styrene-ethylenebutylene-olefin crystals, block copolymers of olefin crystals-ethylenebutylene-olefin crystals, and aluminum acetyl alkoxide dialkylates, and one kind or two or more kinds of these can be used.

As a preferred commercially available product of the calcium salt of a phosphate ester, CrodaxDP-301 LA (manufactured by Croda Japan (クローダジャパン)) and the like can be mentioned. The fine particle silica which can be used includes hydrophilic fine particle silica and hydrophobic fine particle silica, and preferred commercial products of hydrophilic silica include AEROSIL-300 and AEROSIL-380 (manufactured by JAPONIC (アエロジル)), and preferred commercial products of hydrophobic silica include AEROSIL-974D, AEROSIL-972 (manufactured by JAPONIC (アエロジル)).

Further, as preferable commercial products of the block copolymer of polystyrene-polyethylene/butylene rubber-polystyrene, Kraton (クレイトン) GFG-1901X, Kraton (クレイトン) GG-1650 (manufactured by Shell Japan (シェルジャパン) corporation), Septon (セプトン)8007, Septon (セプトン)8004 (manufactured by Kuraray (クラレ)) and the like can be cited. Further, as a preferable commercial product of the block copolymer of polystyrene-polyethylene/propylene rubber-polystyrene, Kraton (クレイトン) GG-1730 (manufactured by Shell Japan (シェルジャパン)), Septon (セプトン)2006, Septon (セプトン)2063 (manufactured by Kuraray (クラレ) or the like can be cited.

Preferred commercially available products of the hydrogenated styrene-butadiene rubber include DYNARON1320P, DYNARON1321P (JSR), TUFTEC (タフテック) Hl041, TUFTEC (タフテック) Hl141 (Asahi Kasei corporation), and the like.

Preferred commercial products of the styrene-ethylenebutene-olefin crystalline block copolymer include DYNARON4600P (JSR corporation), and preferred commercial products of the olefin crystalline-ethylenebutene-olefin crystalline block copolymer include DYNARON6200P and DYNARON6201B (JSR corporation).

Preferred commercial products of the alkylalkoxyaluminum dialkylate include Plenoct (プレンアクト) AL-M (manufactured by Ajinomoto Fine-Technio (Kamozuki ファインテクノ)), and the like.

Among these thickeners, thermoplastic olefin elastomers such as a styrene-ethylene butene-olefin crystal block copolymer and an olefin crystal-ethylene butene-olefin crystal block copolymer are preferably used from the viewpoint of further exhibiting the effect of the present invention.

From the viewpoint of obtaining an ink follower that prevents ink recovery, the frequency range preferably increases exponentially from 1rad/s to 63rad/s, and the average value of tan δ values measured for each frequency is 1.0 or more, and more preferably 1.7 to 3.4.

Here, tan δ is a value representing loss modulus of elasticity/storage modulus of elasticity, and conventionally, it is known that tan δ increases exponentially in the frequency region "1 rad/s to 63 rad/s" and the average value of tan δ values measured for each frequency is preferably 1.0 or less. In the present invention, the average value of tan δ values measured for each frequency in the range of 1rad/s to 63rad/s is 1.0 or more, and vibration can be absorbed to prevent occurrence of ink recovery.

Further, the frictional body is preferably colored in a color having a luminance value lower than that of the thermochromic ink stored in the writing instrument 1. That is, in the case where the thermochromic ink of the writing instrument 1 is not discolored but transferred to the surface of the frictional body when the frictional body is used, the transfer of the thermochromic ink can be made inconspicuous. In particular, by making the color of the frictional body black or making the brightness value 2.5 or less, the dirty portion of the surface of the frictional body which appears with use can be made inconspicuous.

The luminance values are derived by: using a measuring device such as a general-purpose color difference meter (TC-8600A, manufactured by Tokyo electrochrome Co., Ltd.), a Munsell color system was used to measure the surface brightness value of a rubbing body and the brightness value of a thermochromic ink by writing on a paper surface at a writing speed of 4.5m/min and a pitch of 0.1mm (JIS P3201, a former Japanese Industrial Standard; high-quality paper made of 100% chemical pulp and having a basis weight of 40g/m²～157g/m²Whiteness of 75.0% or more).

As the material constituting the friction body, a polypropylene-based resin is used in an amount of 50% by mass or more, and the tensile elastic modulus (JIS K7161: 2014-1) of the friction body is preferably 70MPa or more.

By using the friction member having such characteristics, the feeling of resistance when the handwriting formed by the thermochromic ink is discolored or decolored by rubbing is small, sufficient frictional heat can be obtained with a small force, and a thin portion or the like can be easily eliminated.

The polypropylene resin that can be used is a material to be a base material of a friction body, and examples thereof include a propylene homopolymer, and a copolymer (including a block copolymer and a random copolymer) of propylene and other small amount of α -olefin (for example, ethylene, 1-butene, 1-hexene, 1-octene, 4-methyl-1-pentene, and the like). As the polypropylene resin, one of these materials or a mixture of two or more of them can be used.

The effect of the present embodiment can be exhibited by using 50 mass% or more of the polypropylene-based resin in the total amount of the friction member.

Examples of usable resins other than the polypropylene-based resin include polyethylene and ionomers. From the viewpoint of further exhibiting the effects of the present embodiment, it is desirable that these resins are contained in an amount of 0.5 to 30% by mass based on the total mass of the friction body.

The material constituting the friction member may preferably contain at least one resin selected from rosin-based resins, terpene-based resins, petroleum-based resins, phenol-based resins, coal-based resins, and xylene-based resins, from the viewpoint of adjusting the adhesiveness and allowing sufficient frictional heat to be exhibited even with a light force.

Among these resins, a resin having a molecular weight of several hundred to several thousand is selected, and by blending the selected resin into a blending system of a polypropylene-based resin which is a main component of the friction body, adhesiveness can be imparted to the friction body, and the effects of the present embodiment can be further exhibited. Specifically, the resins described above, which have a molecular weight of preferably 500 to 5000, more preferably 700 to 4000, can be used, for example, natural resins such as rosin-based resins and terpene-based resins, petroleum-based resins, phenol-based resins, coal-based resins, and xylene-based resins.

Examples of the rosin-based resin include gum rosin, tall oil rosin, wood rosin, hydrogenated rosin, disproportionated rosin, polymerized rosin, glycerol and pentaerythritol ester of modified rosin, and examples of the terpene-based resin include terpene resins such as α -pinene-based, β -pinene-based and dipentene-based resins, aromatic modified terpene resins, terpene phenol resins and hydrogenated terpene resins.

Among these resins, from the viewpoint of further smoothness, polymerized rosin, terpene resins, hydrogenated terpene resins, aromatic-modified hydrogenated terpene resins, and terpene phenol resins are preferable.

The petroleum resin can be obtained by, for example, thermally decomposing naphtha in the petrochemical industry, and polymerizing a decomposed oil fraction containing unsaturated hydrocarbons such as olefins and diolefins, which are by-produced together with petrochemical base materials such as ethylene and propylene, in a mixed state by a Friedel Crafts type catalyst.

Examples of the petroleum resin include C obtained by thermal decomposition of naphtha₅Aliphatic petroleum resin obtained by (co) polymerization of distillate, C obtained by thermal decomposition of naphtha₉Aromatic petroleum resin obtained by (co) polymerizing distillate C₅Fraction and C₉Alicyclic compounds such as copolymerized petroleum resins, hydrogenated resins, and dicyclopentadiene obtained by copolymerization of fractionsPetroleum resins such as petroleum resins, styrene resins such as styrene, substituted styrene, and copolymers of styrene and other monomers.

For C obtained by thermal decomposition of naphtha₅The fraction usually contains olefinic hydrocarbons such as 1-pentene, 2-methyl-1-butene, 2-methyl-2-butene and 3-methyl-1-butene, and diolefinic hydrocarbons such as 2-methyl-1, 3-butadiene, 1, 2-pentadiene, 1, 3-pentadiene and 3-methyl-1, 2-butadiene.

In addition, C is added₉The aromatic petroleum resin obtained by (co) polymerization of the fraction is a resin obtained by polymerizing an aromatic polymer having 9 carbon atoms and containing vinyl toluene and indene as main monomers, and is C obtained by thermal decomposition of naphtha₉Specific examples of the fraction include styrene homologues such as α -methylstyrene, β -methylstyrene and γ -methylstyrene, indene homologues such as indene and coumarone, and the like.

The trade names include ペトロジン manufactured by Mikuni chemical Industry K.K, ペトライト manufactured by JXJ Nimi Industrial Inc., Neolymer manufactured by JX Nikko Stone energy sources, ペトコール manufactured by Tosoh, ペトロタック, and the like.

And, comprising said C₉A modified petroleum resin obtained by modifying a petroleum resin of a fraction is preferably used in the present embodiment as a resin which highly achieves both adhesiveness and adhesion durability.

Examples of the modified petroleum resin include C modified with an unsaturated alicyclic compound₉Petroleum resin, and C modified with a compound having a hydroxyl group₉Petroleum resin, C modified with unsaturated carboxylic acid compound₉Petroleum resin, etc.

Preferred unsaturated alicyclic compounds include cyclopentadiene, methylcyclopentadiene, and the like, and dicyclopentadiene, cyclopentadiene/methylcyclopentadiene codimer, tricyclopentadiene, and the like, which are diels-alder reaction products of alkylcyclopentadiene, and dicyclopentadiene is particularly preferred.

Dicyclopentadiene modified C₉The petroleum resin can exist in the presence ofCyclopentadiene and C₉Both fractions are obtained by thermal polymerization or the like in the presence of the fraction.

As dicyclopentadiene modified C₉Examples of the petroleum resin include Neoplaster 130S produced by JX Nikkai Stone energy sources.

Examples of the compound having a hydroxyl group include an alcohol compound and a phenol compound.

Specific examples of the alcohol compound include alcohol compounds having a double bond such as allyl alcohol and 2-butene-1, 4-diol.

As the phenol compound, there can be used alkylphenols such as phenol, cresol, xylenol, p-tert-butylphenol, p-octylphenol and p-nonylphenol.

These hydroxyl group-containing compounds may be used alone or in combination of two or more.

C containing hydroxy groups₉The petroleum resin may be produced by a method in which an ester group is introduced into a petroleum resin by thermally polymerizing an alkyl (meth) acrylate or the like together with a petroleum fraction and then reducing the ester group, a method in which a double bond is left in a petroleum resin or is hydrated after the double bond is introduced, or the like.

Further, as a hydroxyl group-containing C₉As the petroleum resin, resins obtained by various methods as described above can be used, but from the viewpoint of performance and production, it is preferable to use a phenol-modified petroleum resin obtained by reacting C in the presence of phenol₉Obtained by cationic polymerization of fractions, easy to modify and low in cost.

As phenol modification C₉Examples of the petroleum resin include Neoplaster-E-130 produced by JX Rijiri Rijie Stone energy sources.

And C obtained by modification with an unsaturated carboxylic acid compound₉A petroleum resin obtained by reacting C with an ethylenically unsaturated carboxylic acid₉Is a resin obtained by modifying a petroleum resin.

Representative examples of the ethylenically unsaturated carboxylic acid include maleic acid (anhydride), fumaric acid, itaconic acid, tetrahydrophthalic acid (anhydride), methacrylic acid, and citraconic acid.

Unsaturated carboxylic acid modified C₉The petroleum resin can be prepared by reacting C₉Obtained by thermal polymerization of petroleum resin and ethylenically unsaturated carboxylic acid. In the present embodiment, maleic acid-modified C is preferable₉Is petroleum resin.

As unsaturated carboxylic acid modified C₉Examples of the petroleum resin include Neoplaster 160 manufactured by JX Nikko Ore energy sources.

In addition, C obtained by thermal decomposition of naphtha can be preferably used₅Fraction and C₉A copolymer resin of fractions.

Here, as C₉The fraction is not particularly limited, but is preferably C obtained by thermal decomposition of naphtha₉And (6) cutting.

Specific examples thereof include TS30, TS30-DL, TS35 and TS35-DL of Struktol series manufactured by SCHILL & SEILACHER.

Examples of the phenol resin include alkylphenol formaldehyde resins and rosin-modified products thereof, alkylphenol acetylene resins, modified alkylphenol resins, terpene phenol resins, and the like, and specifically include the trade name hipanol 1502 (manufactured by hitachi chemical industries) which is a phenol-formaldehyde alkylphenol resin, and the trade name コレシン (manufactured by BASF) which is a p-tert-butylphenol acetylene resin.

The coal-based resin may be coumarone indene resin, and the xylene-based resin may be xylene formaldehyde resin.

Further, polybutene can also be used as a tackifying resin.

Among these resins, C is preferable from the viewpoint of adhesiveness and adhesive durability₅Fraction and C₉Copolymer resin of distillate C₉Aromatic petroleum resin, phenol resin and coumarone indene resin obtained by (co) polymerizing the fractions.

The softening point of these resins is preferably 200 ℃ or lower (measurement method: ASTM E28-58-T), and more preferably in the range of 80 ℃ to 150 ℃.

When the softening point exceeds 200 ℃, the workability may be deteriorated, and when the softening point is less than 80 ℃, the adhesive property may be deteriorated. From these viewpoints, the softening point is more preferably in the range of 90 ℃ to 120 ℃. The resins may be used alone or in combination of two or more.

From the viewpoint of further exhibiting the effects of the present embodiment, it is desirable that the amount of at least one resin selected from the rosin-based resin, the terpene-based resin, the petroleum-based resin, the phenol-based resin, the coal-based resin, and the xylene-based resin used for the purpose of adjusting the adhesiveness of these resins is preferably 0.05 to 20% by mass, more preferably 0.05 to 10% by mass, based on the total amount of the friction material.

In the friction member of the present embodiment, in addition to the polypropylene-based resin and the like, optional components such as a heat stabilizer, an antioxidant, a light stabilizer, an ultraviolet absorber, a crystal nucleating agent, an antiblocking agent, a sealing property improver, a mold release agent (e.g., stearic acid, silicone oil, and the like), a lubricant such as polyethylene wax, a colorant, a pigment, an inorganic filler (e.g., alumina, talc, calcium carbonate, mica, wollastonite, clay, and the like), a foaming agent (organic system, inorganic system), and a flame retardant (e.g., a hydrated metal compound, red phosphorus, ammonium polyphosphate, an antimony compound, silicon, and the like) may be contained in appropriate amounts as required within a range in which the effects of the present embodiment are not impaired.

The material of the friction member may further contain phenyl alkylsulfonate or cyclohexane dicarboxylate. By containing phenyl alkylsulfonate and cyclohexanedicarboxylate in the friction material, handwriting and the like can be eliminated without damaging the paper surface and without blurring printed characters and the like.

The friction member of the present embodiment can be produced by using the polypropylene resin or the like and using a method such as extrusion molding or injection molding.

The friction member of the present embodiment is required to have a tensile elastic modulus (JIS K7161: 2014-1) of 70MPa or more, preferably 80MPa to 5000MPa, in order to provide durability and to exhibit the effects of the present embodiment. If the tensile elastic modulus is less than 70MPa, the effects of the present embodiment cannot be exhibited, and this is not preferable.

In order to set the tensile elastic modulus of the friction member to 70MPa or more, the type and the amount of the polypropylene resin used, the type and the amount of other resins, the content thereof, and the like can be appropriately combined and adjusted.

More preferably, the permanent elongation of the friction member (JIS K6273: 2006) is 50% or more, and particularly preferably 50% to 100%, from the viewpoint of further exhibiting the effects of the present embodiment and reducing the resistance feeling.

The "permanent elongation" defined in the present embodiment means that the test piece is held at 23 ℃ for 6 hours in a state of being elongated twice and then the stress is removed. The length after elongation is divided by the length before elongation to obtain a value (%).

In the present embodiment, it is desirable to set the friction coefficient of the friction body to 0.3 to 0.5 from the viewpoint of providing an appropriate resistance feeling without excessive sliding.

The "coefficient of friction" defined in the present embodiment is a coefficient of friction measured by rubbing a friction body against a high-quality paper at a load of 4.9N, an angle of 90 degrees and a writing speed of 100mm/min using a commercially available surface texture measuring instrument (HEIDON-14D, New Toyobo Co., Ltd.).

In order to set the permanent elongation and the friction coefficient of the friction member in the preferable ranges, the amount of the polypropylene resin used, the type of other resin, the content thereof, and the like can be appropriately combined and adjusted.

The friction member can be applied to a touch pen or a stylus pen, and can be provided with conductivity.

According to the friction member of the present embodiment, compared with conventional elastomers such as styrene elastomers and plastic foams, etc., the friction member can exhibit excellent functions which have not been achieved so far, because the polypropylene resin is set to 50 mass% or more and the tensile elastic modulus of the friction member is set to 70MPa or more: the thermochromic ink is less resistant to a scratch or fading process, and can provide sufficient frictional heat even with a light force, and can easily remove a thin portion.

Further, the above function can be more effectively exhibited by setting the permanent elongation of the friction member to 50% or more and/or setting the friction coefficient to 0.3 to 0.5.

Fig. 25 is a perspective view of a writing instrument 201 according to another embodiment of the present invention. As compared with the writing instrument 1 according to the above-described embodiment, the writing instrument 201 is different in the shape of the rear barrel and the spacer, and is the same or substantially the same as other members, and therefore only the difference will be described.

Fig. 26 is a longitudinal sectional view of the rear barrel 203. The rear barrel 203 is disposed so that an upper portion in fig. 26 is a rear side of the writing instrument 201 in an assembled state of the writing instrument 1. Two elongated projections 213 of a substantially I-shape are provided as engaging portions on the inner peripheral surface of the rear barrel 203. The two elongated protrusions 213 are arranged 120 degrees apart around the central axis. The elongated protrusion 213 may be a separate member, for example, instead of being provided on the inner peripheral surface of the rear barrel 203. The position of the front end portion of the elongated protrusion 213 in the rear barrel 203 is the same as the position of the front end portion of the corresponding T-shaped protrusion 13 in the rear barrel 3 of the writing instrument 1. However, the position of the rear end of the elongated projection 213 in the rear barrel 203 is located forward of the position of the rear end of the T-shaped projection 13 in the rear barrel 3 of the writing instrument 1. That is, the length of the elongated projection 213 in the axial direction is formed shorter than the length of the T-shaped projection 13 in the axial direction.

Figure 27 is a perspective view of septum 230. Spacer 230 is disposed so that the upper side in fig. 27 is the rear side of writing instrument 201 in the assembled state of writing instrument 201. The spacer 230 has a coupling portion 233 formed to couple the rear end portions of the three guide rail portions 32. The coupling portion 233 has three coupling portion pieces 33a, and the three coupling portion pieces 33a have an outer shape formed slightly smaller than the outer diameter of the three guide rail portions 32. That is, spacer 230 does not include rotation restricting piece 33b of spacer 30 of writing instrument 1. Thus, in the writing instrument 201, the rear barrel 203 can freely rotate with respect to the front barrel 2. That is, the rotation of the rear barrel 203 about the axis is not restricted by the contact between the coupling portion 233 of the spacer 230 and the guide projection 53 of the rotary cam 50. A projecting mark portion 235 extending forward is formed on the front end surface of the flange portion 34. The marker 235 protrudes radially outward from the marker 35 in the writing instrument 1. Thus, in the writing instrument 201, the marker 235 protrudes from the outer surface of the barrel 4 to such an extent that it can be clearly distinguished by touching with a finger (fig. 25). This makes it possible to easily identify the connection between the front barrel 2 and the rear barrel 3.

Fig. 28 is a schematic diagram illustrating the operation of the pen core in the knock operation. The operation of the pen core at the time of the knock operation in the writing instrument 201 is basically the same as the operation of the pen core at the time of the knock operation in the writing instrument 1 described above with reference to fig. 22. However, unlike the T-shaped projection 13 of the writing instrument 1, the elongated projection 213 of the writing instrument 201 is not involved in the movement of the pen core during the knock operation, and therefore is not shown in fig. 28. In the writing instrument 1 in the writing state, as described with reference to fig. 22, two of the three slide blocks 60 are engaged with the T-shaped projection 13, and the advance of the two slide blocks 60 is restricted. However, in the writing instrument 201, since the rear end portion of the elongated projection 213 is located forward of the rear end portion of the T-shaped projection 13 of the writing instrument 1, the slide block 60 does not engage with the elongated projection 213.

Here, in the writing instrument 1, the slider 60 is locked or substantially locked to the T-shaped projection 13 in both the non-writing state (fig. 22 (a)) and the writing state (fig. 22 (C)). Therefore, if the writing instrument 1 is erroneously dropped in a state where the tip of the writing instrument 1 is directed downward, a strong impact in the axial direction is applied to the slide block 60 and the pen core 5 connected to the slide block 60. At this time, since the slide block 60 is locked with the T-shaped projection 13, the pen core 5 receives an inertial force in a direction of separating from the slide block 60.

In contrast, in the writing instrument 201, since the slide block 60 does not engage with the elongated projection 213, even if the writing instrument 201 is dropped with the tip end thereof facing downward, the pen core 5 moves forward together with the slide block 60. Thus, the pen core 5 is not detached from the slide block 60. In other words, in the writing state of the writing instrument 201, since the slide block 60 is separated from the 1 st cam surface 44, the advance of only the slide block 60 is not restricted, and the pen core 5 is not detached from the slide block 60. Further, the advance of the pen core 5 and the slide block 60 is regulated by the writing part 5a of the pen core 5 abutting against the tapered portion of the distal end of the front barrel 2.

Description of the reference numerals

1. A writing instrument; 4. a pen holder; 5. a pen core; 7. an eliminating member; 10. a rear spring; 11. a front spring; 13. t-shaped bulges are formed; 20. an inner barrel; 30. a spacer; 40. a sleeve member; 50. rotating the cam; 60. a slider; 70. an operating member; 80. a rotor; 90. a brake lever; 100. a snap ring.

Claims

1. A knock-type writing instrument having a barrel and an operation section, and capable of switching between a writing state and a non-writing state by performing a knock operation of pushing the operation section forward,

the knock-type writing instrument further includes: a braking member movable in the cartridge in a front-rear direction under the gravity; a rotating member that is movable together with the operating portion and rotates about a central axis; and a locking part which can be locked with the rotating component,

when the front end of the barrel is directed upward, the stopper member moves rearward, the rotation of the rotary member is restricted, and the rotary member engages with the engaging portion, whereby the forward movement of the operating portion is prevented.

2. The knock-type writing instrument according to claim 1,

the rotating member is a cylindrical member.

3. The knock-type writing instrument according to claim 1 or 2,

a protrusion is provided on an inner surface of the rotary member, and the rotation of the rotary member is restricted by locking the stopper member inserted into the rotary member with the protrusion.

4. The knock-type writing instrument according to claim 1 or 2,

the rotation member has a 1 st slope inclined in a circumferential direction with respect to a plane perpendicular to the front-rear direction, the locking portion has a 2 nd slope inclined in the circumferential direction with respect to a plane perpendicular to the front-rear direction,

the operation portion is prevented from moving forward by abutting the 1 st inclined surface of the rotation member, the rotation of which is restricted, with the 2 nd inclined surface of the engagement portion.

5. The knock-type writing instrument according to claim 4,

the 1 st slope or the 2 nd slope has an inclination angle of more than 45 degrees with respect to the axial direction of the knock type writing instrument.

6. The knock-type writing instrument according to claim 1 or 2,

the knock-type writing instrument includes: a plurality of writing bodies; sliding members to which the writing bodies are respectively connected; and a 1 st cam surface disposed in front of the slide member and cooperating with the slide members, respectively, at least one of the slide members being spaced apart from the 1 st cam surface in a writing state.

7. The knock-type writing instrument according to claim 1 or 2,

the whole or part of the operation part is an elimination part which can eliminate the handwriting of the pressing type writing tool.

8. The knock-type writing instrument according to claim 7,

the eliminating part is a polypropylene resin in an amount of 50% by mass or more based on JIS K7161: 2014-1 is a friction body having a tensile elastic modulus of 70MPa or more.