JP7433002B2 - double writing instrument - Google Patents

Description

TECHNICAL FIELD The present invention relates to a compound writing instrument equipped with a plurality of writing fonts.

BACKGROUND ART Compound writing instruments are known that include a plurality of cursive fonts and can put one selected cursive font into a writing state by operating an operation unit (for example, Patent Document 1 and Patent Document 2). In order to easily identify the cursive font that is desired to be in a writing state from among a plurality of cursive fonts, in the compound writing instrument described in Patent Document 1, marks are attached to the surface of the barrel barrel. On the other hand, in the dual writing instrument described in Patent Document 2, a separate identification member is provided on the barrel.

Japanese Patent Application Publication No. 2002-337498 JP2009-208258A

In the double writing instrument described in Patent Document 1, there is a risk that the mark may disappear due to peeling or the like over time. Furthermore, in the double writing instrument described in Patent Document 2, the identification member is provided to protrude from the outer surface of the barrel, so if the double writing instrument is accidentally dropped, the identification member may fall off from the barrel. There is a risk of it getting lost. As a result, it may become difficult to specify the cursive font that is desired to be written. There is also a need to identify which of a plurality of cursive fonts a cursive font in a writing state is.

SUMMARY OF THE INVENTION An object of the present invention is to provide a compound writing instrument that allows easy identification of a cursive font that is desired to be in a writing state or a cursive font that is in a writing state.

According to one aspect of the present invention, a barrel, a plurality of writing fonts, an operating section, a rotation selection member, and an identification section corresponding to each of the plurality of writing fonts and disposed inside the barrel. and, by operating the rotation selection member to select one of the plurality of cursive fonts and performing a knocking operation of pressing the operating section forward, writing about the selected cursive font. A dual writing instrument capable of switching between a writing state and a non-writing state, wherein a window portion is formed in the barrel, and the identification portion corresponding to the selected writing body is visible through the window portion. A dual-action writing instrument is provided.

The identification section may include a first identification section, and the first identification section may be visible in both a writing state and a non-writing state. The writing apparatus may further include a spacer in which each of the plurality of cursive characters can be arranged, and the divided first identification part may be provided on an outer surface of the spacer. The identification section may include a second identification section, and the second identification section may be visible only in either a writing state or a non-writing state. The writing device may further include a plurality of sliding pieces connected to each of the plurality of cursive letters, and each of the plurality of sliding pieces may be provided with the second identification portion. The identification section may include a third identification section, and the third identification section may be visible only in either a writing state or a non-writing state. The third identification portion may be provided in each of the plurality of cursive letters. The shaft tube may be configured such that the inside thereof cannot be visually recognized except for the window portion. The plurality of writing fonts may include a refill containing a chromatic thermochromic ink and a refill containing an achromatic non-thermochromic ink. a brake member movable in the longitudinal direction within the shaft cylinder by gravity; a cylindrical rotary member movable together with the operating portion and rotatable around a central axis; and a locking portion capable of locking with the rotary member. further comprising, when the front end of the shaft cylinder is directed upward, the brake member moves rearward, the rotation of the rotary member is restricted, and the rotary member is locked with the locking portion, whereby the operation is performed. A protrusion is provided on the inner surface of the rotary member, and the brake member inserted into the rotary member engages with the protrusion, thereby restricting rotation of the rotary member. You may also do so. All or part of the operating section may be an erasing section capable of erasing handwriting of the dual writing instrument, and the erasing section may be detachable from the barrel.

According to the aspect of the present invention, a common effect is provided in that a double writing instrument is provided that allows easy identification of a cursive font that is desired to be in a writing state or a cursive font that is in a writing state.

FIG. 1 is a perspective view of a writing instrument according to an embodiment of the present invention. FIG. 2 is a longitudinal cross-sectional view of the writing instrument in a non-writing state with the front end facing downward. FIG. 2 is a longitudinal cross-sectional view of the writing instrument in a writing state with the front end facing downward. FIG. 3 is an enlarged longitudinal cross-sectional view of the writing instrument with the front end facing upward. FIG. 3 is a perspective view illustrating switching of erasing members. It is a perspective view of the rear part of a 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. 3 is a longitudinal cross-sectional view of the rear shaft. It is a longitudinal cross-sectional view of an inner cylinder. FIG. 3 is a perspective view of a spacer. It is a perspective view of a collar. FIG. 3 is a rear view of the rotating cam. It is a perspective view of a sliding piece. It is a perspective view of an operation member. It is a perspective view of a rotor. It is a perspective view of a brake rod. It is a perspective view of a knock ring. It is a schematic diagram explaining operation of a knock ring. FIG. 3 is a cross-sectional view illustrating the operation of the brake rod. It is another schematic diagram explaining the operation|movement of a knock ring. It is another schematic diagram explaining the operation|movement of a knock ring. It is a schematic diagram explaining the operation|movement of a refill at the time of a knock operation. It is a schematic diagram explaining the switching operation of the refill which can appear.

Embodiments of the present invention will be described in detail below with reference to the drawings. Corresponding components are given common reference numerals throughout the drawings.

FIG. 1 is a perspective view of a writing instrument 1 according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional view of the writing instrument 1 in a non-writing state with the front end facing downward, and FIG. 3 is a longitudinal sectional view of the writing instrument 1 in a writing state with the front end facing downward. FIG. 4 is an enlarged vertical cross-sectional view of the writing instrument 1 with the front end facing upward; FIG. 5 is a perspective view illustrating switching of the erasing member; and FIG. 7 is a perspective view of the rear side of the writing instrument 1 in a writing state, and FIG. 7 is a perspective view of the opposite side of the writing instrument 1 of FIG. 6.

The writing instrument 1 includes a barrel 4 that is formed in a cylindrical shape and includes a front shaft 2 and a rear shaft 3, and a plurality of refills 5 that are cursive writing instruments that are arranged inside the barrel 4 and have a writing part 5a at one end. have. The front shaft 2 and the rear shaft 3 may be formed integrally. Note that in FIGS. 6 and 7, the rear shaft 3 is omitted. In this embodiment, the front shaft 2 is made of metal. The outer peripheral surface of the front shaft 2 has grooves in a lattice pattern with a groove width of 0.1 to 0.3 mm and a pitch of 0.2 to 0.8 mm, which is effective against fingerprint streaks when gripping. It plays the role of anti-slip effect.

In this specification, in the axial direction of the writing instrument 1, 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. Unless otherwise specified, the central axis or axial direction refers to the central axis or axial direction of the writing instrument 1.

The writing instrument 1 is a knock-type writing instrument in which the refill 5 comes out and retracts from the barrel 4 by a knocking operation in which the operating portion is pressed forward. Further, the writing instrument 1 is also a multiple writing instrument equipped with a plurality of refills 5.

The writing instrument 1 has an inner cylinder 20 attached to the rear end of the rear shaft 3 and provided with a separate metal clip 28. The inner cylinder 20 may also be referred to as the shaft cylinder 4. The writing instrument 1 includes a spacer 30 , a collar member 40 disposed around the spacer 30 , a rotary cam 50 disposed behind the collar member 40 , an inner tube 20 and a collar member 40 in the barrel 4 . The sliding pieces 60, which are a plurality of sliding members arranged between them, the operating member 70 arranged behind the spacer 30, the rotor 80 arranged around the operating member 70, and the inside of the operating member 70 and a knock ring 100 arranged around the operating member 70 behind the rotor 80.

An erasing member 7 is attached to the rear end of the operating member 70 via a holding member 6. A cover member 8 made of resin is removably attached to the holding member 6 , and the erasing member 7 is covered by the cover member 8 . By pressing forward the cover member 8 in an attached state, or the erasing member 7 in a state in which the cover member 8 is removed, the operating member 70 moves forward, and a knocking operation is performed. In other words, the rear end of the writing instrument 1, that is, the erasing member 7 or the cover member 8 functions as an operating section for the knock operation. Note that all or part of the operating section may be an erasing section that can erase the handwriting of the writing instrument 1. In FIG. 4, the cover member 8 is omitted.

As shown in FIG. 4, the erasing member 7 includes a first erasing member 7a and a second erasing member 7b. The first erasing member 7a is a cylindrical member. A flange portion 7c is formed on the outer peripheral surface of one end of the first erasing member 7a. The other end edge of the first erasing member 7a is rounded. The second erasing member 7b is a cylindrical member having the same outer diameter as the first erasing member 7a, and has a cylindrical cylindrical projection 7d formed on one end surface. The cylindrical projection 7d of the second erasing member 7b is arranged in a hole provided in the end face of the first erasing member 7a on the side where the flange portion 7c is formed. The first erasing member 7a and the second erasing member 7b are integrally formed by adhesion, fitting, two-color molding, or the like.

Referring to FIGS. 4 and 5, the erasing member 7 is removably fitted into a cylindrical fitting hole 6a formed at the rear end of the holding member 6. That is, the inner diameter of the fitting hole 6a of the holding member 6 is formed to be approximately the same as the outer diameter of the first erasing member 7a and the second erasing member 7b. Therefore, in the erasing member 7, the first erasing member 7a and the second erasing member 7b can be selectively inserted into and fitted into the fitting hole 6a of the holding member 6. Insertion of the first erasing member 7a and the second erasing member 7b is regulated by the contact between the flange portion 7c and the rear end surface of the holding member 6. When the first erasing member 7a is inserted into the fitting hole 6a, the second erasing member 7b is exposed to the outside, and handwriting can be erased using the second erasing member 7b. On the other hand, when the second erasing member 7b is inserted into the fitting hole 6a, the first erasing member 7a is exposed to the outside, and the handwriting can be erased using the first erasing member 7a. The erasing member 7 may be removed from the holding member 6 and erasing may be performed by the erasing member 7 alone.

As shown in FIG. 5, the outer circumferential surface of the cover member 8 has an uneven portion 8a to prevent slipping when gripped by a user. The uneven portion 8a includes a plurality of protrusions 8b that extend along the circumferential direction and are aligned along the axial direction, and a plurality of vertical grooves 8c that cross the plurality of protrusions 8b. The pattern formed by the uneven portion 8a of the cover member 8 is similar to the pattern formed by the knurling process on the outer peripheral surface of the front shaft 2. As a result, the writing instrument 1 has a uniform design as a whole. Further, since the cover member 8 is provided with the uneven portion 8a, the user can remove the cover member 8 from the holding member 6 without slipping his or her fingers. Note that a circular ventilation hole 8d is formed at the end of the cover member 8.

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

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

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

FIG. 8 is a longitudinal sectional view of the rear shaft 3. When the writing instrument 1 is assembled, the rear shaft 3 is arranged such that the upper side is on the rear side of the writing instrument 1 in FIG. 8 . Two substantially I-shaped protrusions 13 are provided on the inner circumferential surface of the rear shaft 3 as locking portions. The two I-shaped protrusions 13 are spaced apart by 120 degrees around the central axis. A plurality of annular grooves 14 are formed on the inner peripheral surface of the front end of the rear shaft 3 and are spaced apart in the axial direction. Note that the I-shaped protrusion 13 may not be provided on the inner circumferential surface of the rear shaft 3, but may be provided as a separate member, for example. A first window portion 111 and a second window portion 112, which are through holes, are formed in the rear shaft 3. The first window section 111 is formed forward of the second window section 112.

FIG. 9 is a longitudinal sectional view of the inner cylinder 20. When the writing instrument 1 is assembled, the inner cylinder 20 is arranged such that the upper side is on the rear side of the writing instrument 1 in FIG. 9 . The inner cylinder 20 is attached to the rear end of the rear shaft 3 by fitting or press fitting. A step portion 21 facing rearward is formed on the inner circumferential surface of the inner cylinder 20. Six first inner protrusions 22 extending in the axial direction are provided at equal intervals along the circumferential direction on the inner circumferential surface of the inner cylinder 20 in front of the step portion 21 . A slope 22a inclined in the circumferential direction is formed on the front end surface of each of the first inner protrusions 22. The six first inner protrusions 22 constitute a first outer cam 23. A second inner protrusion 24 that protrudes further than the first inner protrusion 22 is formed at the rear end of each of the first inner protrusions 22 as a locking part. A slope 24a inclined in the circumferential direction is formed on the rear end surface of each of the second 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 second inner projection 24. has been done. The six second inner protrusions 24 constitute a second outer cam 25. A rectangular notched recess 26 is formed at the front end of the inner cylinder 20.

FIG. 10 is a perspective view of the spacer 30. When the writing instrument 1 is assembled, the spacer 30 is arranged such that the upper side is on the rear side of the writing instrument 1 in FIG. 10 . The spacer 30 includes a cylindrical main body 31, three rail parts 32 extending rearward from the rear end of the main body 31, and a connection formed to connect the rear ends of the three rail parts 32. 33. Three grooves into which the refill 5 can be inserted and placed are defined by the two adjacent rail parts 32 and the connecting part 33. That is, in this embodiment, the writing instrument 1 can accommodate three refills 5. A flange portion 34 is formed on the outer circumferential surface of the main body portion 31, and the outer circumferential surface of the main body portion 31 is divided into front and rear portions by the flange portion 34. A protruding mark portion 35 extending forward is formed on the front end surface of the flange portion 34 . The mark portion 35 fits into the recessed portion of the display member 12 (FIG. 1). A male threaded portion 36 is formed at the front of the main body portion 31, and the spacer 30 is screwed into the front shaft 2 by the male threaded portion 36. A plurality of annular protrusions 37 are formed at the rear portion of the main body portion 31 and spaced apart in the axial direction.

A part of the outer surface of the main body 31 of the spacer 30 is divided into equal intervals corresponding to each of the refills 5 disposed between the rail parts 32, and colored bands are colored to correspond to the divided parts. 38 are provided. In this embodiment, the colored band 38 is divided into three sections corresponding to the three refills 5, namely, a first section 38a, a second section 38b, and a third section 38c. Each section is colored, for example, in the same color as the writing color of the corresponding refill 5.

FIG. 11 is a perspective view of the collar member 40. When the writing instrument 1 is assembled, the collar member 40 is arranged such that the upper side is on the rear side of the writing instrument 1 in FIG. 11 . The collar member 40 is formed into a cylindrical shape as a whole. Two approximately T-shaped recesses 41 having complementary shaped portions are formed at positions corresponding to the I-shaped protrusions 13 of the rear shaft 3 on the outer peripheral surface of the collar member 40 . In a portion of the rear end surface corresponding to between the two T-shaped recesses 41, a stepped raised portion 42 is formed. A notch 43 is formed in a part of the rear end surface of the collar member 40, which is diagonally cut out from the rear end side toward the front (FIG. 7). The rear end surface of the collar member 40 including the end surface of the notch portion 43 constitutes a first cam surface 44 .

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

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

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

FIG. 15 is a perspective view of the rotor 80. When the writing instrument 1 is assembled, the rotor 80 is arranged such that the upper side is on the rear side of the writing instrument 1 in FIG. 15 . The rotor 80 is a cylindrical member. A rotating cam receiving surface 81 is formed on the rear end surface of the rotor 80 and is complementary to the rotating cam surface 72 of the operating member 70 . The rotating cam receiving 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 along the circumferential direction are formed on the outer peripheral surface of the rotor 80, and the rear end surface of the protrusions 82 constitutes a first inner cam 83. Two adjacent protrusions 82 define six locking grooves 84 that extend in the front-rear direction. A locking portion 85 is formed on the rear end surface of each of the protrusions 82 .

FIG. 16 is a perspective view of the brake rod 90. When the writing instrument 1 is assembled, the brake rod 90 is arranged such that the upper side is on the rear side of the writing instrument 1 in FIG. 16 . Brake rod 90 is a solid member. A small diameter portion 91 is formed at the rear end of the brake rod 90, and a large diameter portion 92 having a larger diameter is formed in front of the small diameter portion 91. The small diameter portion 91 and the large diameter portion 92 are connected by a tapered surface 93. Two rectangular protrusions 94 are formed on the outer peripheral surface of the large diameter portion 92 and extend in the axial direction at a distance of 180 degrees around the central axis, and a portion of the rear part of the protrusions 94 is cut out into a rectangular shape. A regulating portion 95 is defined.

FIG. 17 is a perspective view of the knock ring 100. When the writing instrument 1 is assembled, the knock ring 100 is arranged such that the upper side is on the rear side of the writing instrument 1 in FIG. 17 . Knock ring 100 is a cylindrical member. Two regulating protrusions 101 are formed on the inner circumferential surface of the knock ring 100, extending in the axial direction and spaced apart by 180 degrees around the central axis. Four right triangular first outer protrusions 102 are formed on the outer peripheral surface of the front end of the knock ring 100. The two first outer projections 102 are spaced apart by 60 degrees around the central axis, and the other two corresponding first outer projections 102 are spaced apart from each other by 180 degrees around the center axis. . A parallelogram-shaped second outer protrusion 103 is formed behind each of the first outer protrusions 102 . The first outer protrusion 102 and the second outer protrusion 103 constitute a second inner cam 104.

Next, the combination and arrangement of each component in the writing instrument 1 will be described with reference to FIGS. 1 to 7.

The spacer 30 is threadedly engaged with the front shaft 2 through a male threaded portion 36. The front end of the rear shaft 3 is inserted into the rear of the main body 31 of the spacer 30. At this time, each of the annular protrusions 37 of the spacer 30 fits into the corresponding annular groove 14 of the rear shaft 3, so that the rear shaft 3 is prevented from easily coming off from the spacer 30 and, by extension, the front shaft 2. Rotatably connected. A front spring 11 and a collar member 40 are arranged around the rail portion 32 of the spacer 30. The front end of the front spring 11 is supported by the rear end surface of the main body 31 of the spacer 30, and the rear end of the front spring 11 is in contact with the front end surface of the collar member 40. The collar member 40 is movable in the front-rear direction and is biased rearward by the front spring 11. Each of the I-shaped protrusions 13 of the rear shaft 3 is accommodated in the T-shaped recess 41 of the corresponding collar member 40, thereby restricting rotation of the collar member 40 about the central axis. Therefore, when the rear shaft 3 is rotated with respect to the front shaft 2, the collar member 40 rotates together with the rear shaft 3.

The refill 5 and the sliding piece 60 are connected by inserting the insertion portion 61 of the sliding piece 60 into the rear end of each of the three refills 5. In this state, each of the refills 5 is inserted into the groove between the rail portions 32 of the spacer 30, and is movable in the front-rear direction. At this time, the slider 62 of the sliding piece 60 projects radially outward from the rail portion 32 of the spacer 30. The slider 62 locks onto the edge of the rail portion 32 and prevents the refill 5 from falling off between the rail portions 32. The slider 62 , particularly the minute protrusions 63 of the slider 62 , are in contact with the first cam surface 44 of the collar member 40 . At this time, one of the sliders 62 of the three sliding pieces 60 is arranged on the first cam surface 44 of the notch 43 of the collar member 40, and the remaining sliders 62 are arranged on the first cam surface 44 of the notch 43 of the collar member 40. It is arranged on the first cam surface 44 on the rear end surface.

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

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

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

A brake rod 90 is arranged inside the operating member 70 and thus the rotor 80 . The brake rod 90 is movable in the front-rear direction within the operating member 70 by gravity. The forward movement of the brake rod 90 is regulated by coming into contact with the rear end surface of the spacer 30, that is, the rear end surface of the connecting portion 33. Rearward movement of the brake rod 90 is restricted by the tapered surface 93 of the brake rod 90 engaging with the inner surface of the operating member 70 (FIG. 4).

A knock ring 100 is rotatably arranged around the through hole 74 of the operating member 70, and the knock ring 100 is movable together with the operating member 70 in the front-rear direction. Specifically, the knock 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 movement in the front and rear directions with respect to the operating member 70 is restricted. At this time, as will be described later with reference to FIG. 74 within a predetermined angular range. Further, the second inner cam 104 of the knock ring 100 is arranged to cooperate with the second outer cam 25 of the inner cylinder 20.

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

The writing instrument 1 can be switched between a writing state and a non-writing state by performing a knocking operation in which the operating section at the rear end of the writing instrument 1 is pressed forward against the urging force of the rear spring 10 and the front spring 11. The basic operation will be explained below. Switching between the writing state and the non-writing state is achieved by the cooperation of the rotary cam surface 72 of the operating member 70 and the rotary cam receiving surface 81 of the rotor 80. This is done by the cooperation of the outer cams 23. The cooperative operation between these cams is similar to that of a conventional knock-type writing instrument, so a brief explanation will be given below.

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

When the operating member 70 moves forward by the knocking operation, the rotor 80 is moved forward by being pressed by the cam flange 71. When the rotor 80 moves forward, it is pressed by the claw portion 52, and the sliding piece 60 including the slider 62 disposed in the cutout portion 43 of the collar member 40 and the collar member 40 move forward. Move to. As a result, the refill 5 connected to this sliding piece 60 protrudes from the shaft tube 4.

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

Next, when the knocking operation is stopped, the sliding piece 60, the rotary cam 50, the rotor 80, and the operating member 70 move slightly rearward via the collar member 40 due to the biasing force of the front spring 11. At this time, the first inner cam 83 of the rotor 80 and the first outer cam 23 of the inner cylinder 20 cooperate to further rotate the rotor 80. That is, the slope 22a of the first inner projection 22 of the inner cylinder 20 and the rear end surface of the projection 82 of the rotor 80, which are slopes inclined in the same direction, come into contact with each other, and a component force in the circumferential direction acts. The force causes rotor 80 to rotate slightly more. Due to this rotation, the phases of the rotating cam surface 72 of the operating member 70 and the rotating cam receiving surface 81 of the rotor 80 are shifted again. The rotation and rearward movement of the rotor 80 are regulated by the first inner protrusion 22 of the inner cylinder 20 being engaged with the engagement portion 85 of the rotor 80 . As a result, the refill 5 is maintained in a state protruding from the barrel 4, and the writing instrument 1 is in a writing state.

To change from the writing state to the non-writing state, perform the knock operation again. When the operating member 70 moves forward by the knocking operation, the rotor 80 is moved forward by being pressed by the cam flange 71. When the rotor 80 moves forward and the rear end of the protrusion 82 passes over the front end of the first inner protrusion 22 of the inner cylinder 20 in the front-rear direction, the restriction on the rotation of the rotor 80 is released. At that moment, a component force in the circumferential direction acts to restore the phase difference between the rotating cam surface 72 of the operating member 70 and the rotating cam receiving surface 81 of the rotor 80, and this component force acts on the rotor 80. Rotate it slightly.

Next, when the knocking operation is stopped, the sliding piece 60, the rotary cam 50, the rotor 80, and the operating member 70 move slightly rearward via the collar member 40 due to the biasing force of the front spring 11. At this time, the first inner cam 83 of the rotor 80 and the first outer cam 23 of the inner cylinder 20 cooperate to further rotate the rotor 80. That is, the slope 22a of the first inner projection 22 of the inner cylinder 20 and the rear end surface of the projection 82 of the rotor 80, which are slopes inclined in the same direction, come into contact with each other, and a component force in the circumferential direction acts. The force causes rotor 80 to rotate slightly more. Due to this rotation, the phases of the rotating cam surface 72 of the operating member 70 and the rotating cam receiving surface 81 of the rotor 80 are shifted again. Rotation of the rotor 80 is regulated by each of the protrusions 82 of the rotor 80 being repositioned between the first inner protrusions 22 of the inner cylinder 20 . Rearward movement of the rotor 80 is regulated by the cam flange 71 of the operating member 70. As the rotor 80 moves rearward, the collar member 40, the sliding piece 60, and the rotary cam 50, which are biased by the front spring 11, also move rearward. As a result, the refill 5 is recessed into the barrel 4, and the writing instrument 1 is in a non-writing state.

The above-described knocking operation for switching between the writing state and the non-writing state is performed with the front end of the writing instrument 1 facing downward. On the other hand, when the front end of the writing instrument 1 is facing upward, the knocking operation cannot be performed. That is, even if an attempt is made to press the operating portion forward, movement of the operating member 70 is blocked, and the operating member 70 cannot be moved forward. This will be explained below.

FIG. 18 is a schematic diagram illustrating the operation of the knock ring 100. FIG. 18 shows the positional relationship of the second inner cam 104 of the knock ring 100 with respect to the second outer cam 25 expanded in the circumferential direction, that is, the second inner protrusion 24 of the inner cylinder 20 and the second inner cam 104 of the knock ring 100. The positional relationship between the first outer protrusion 102 and the second outer protrusion 103 is shown. In FIG. 18, the upper side is the rear side of the writing instrument 1, and the lower side is the front side of the writing instrument 1. FIG. 18(A) shows the state before the knocking operation, FIG. 18(B) shows the state immediately after the operating part starts moving forward due to the knocking operation, and FIG. FIG. 18(D) shows a state in which the operating section has moved forward due to the knocking operation, and FIG. 18(D) shows a state immediately before the operating section returns to its original position due to the stopping of the knocking operation.

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

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

As described above, when the front end of the writing instrument 1 is facing downward, the knock ring 100 rotates in response to the knock operation, so that the knock operation can be performed without blocking the forward movement of the operation member 70, that is, the operation section. becomes possible. On the other hand, when the front end of the writing instrument 1 is facing upward, the rotation of the knock ring 100 is restricted by the brake rod 90, thereby preventing the operating section from moving forward, making it impossible to perform a knock operation. Such a knock-lock mechanism will be explained with reference to FIG. 19.

FIG. 19 is a cross-sectional view illustrating the operation of the brake rod 90. 19(A) is a sectional view taken along line AA in FIG. 3 with the front end of the writing instrument 1 facing downward, and FIG. 19(B) is a sectional view of FIG. 4 with the front end of the writing instrument 1 facing upward. FIG. 3 is a cross-sectional view taken along line BB.

As shown in FIG. 19(A), when the front end of the writing instrument 1 is facing downward, the regulating protrusions 101 of the knock ring 100 are arranged in the through holes 74 of the operating member 70, respectively. Similar to FIG. 18(A), FIG. 19(A) shows a state before a knocking operation is performed, and at this time, the regulating protrusion 101 is close to one edge of the through hole 74. Therefore, the knock ring 100 is rotatable within a predetermined angular range within the restriction that the restriction protrusion 101 receives from the edge of the through hole 74 .

As shown in FIG. 19(B), when the front end of the writing instrument 1 is facing upward, the regulating protrusions 101 of the knock ring 100 are arranged in the through holes 74 of the operating member 70, but the through holes 74 The regulating portion 95 is arranged so as to fill the gap. That is, when the front end of the writing instrument 1 is turned upward, the brake rod 90 moves rearward due to gravity. As a result, the brake rod 90 is inserted deeper into the operating member 70, and the regulating portion 95 is inserted into the gap of the through hole 74. As a result, the regulation protrusion 101 of the knock ring 100 engages with the regulation part 95 of the brake rod 90, thereby regulating the rotation of the knock ring 100.

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

Note that when the front end of the writing instrument 1 is turned from an upward position to a downward position, the brake rod 90 moves forward and the restriction on the rotation of the knock ring 100 is released. As a result, the knocking operation can be performed again.

Since the operating portion of the writing instrument 1 is prevented from moving forward when the front end thereof is facing upward, it is possible to perform a stable scratching operation when erasing handwriting with the writing instrument 1 using the erasing member 7, for example. Become. That is, even if the writing instrument 1 is changed and the operating part is pressed against the writing surface to perform a scratching operation, the operating part will not shake. According to the writing instrument 1, a stable scratching operation can be realized with a mechanism simpler than the conventional one.

For example, the conventional knock-lock mechanism described in Japanese Patent Application Laid-Open No. 2016-107615 has a single knock-lock member, and the front of the operating portion is moved and rotated by the force of gravity of the knock-lock member. It was configured to prevent movement to. On the other hand, the knock lock mechanism of the writing instrument 1 includes a brake rod 90 and a knock ring 100. Therefore, the members responsible for movement and rotation are separated, with the brake rod 90 only moving due to gravity and the knock ring 100 only rotating. As a result, the knock-lock mechanism of the writing instrument 1 can have a shorter overall length as a mechanism than the knock-lock mechanism of Patent Document 1, and the shape and arrangement of parts of the internal mechanism such as near the inner peripheral surface of the barrel. You can have more freedom in designing the location.

The brake rod 90 as a brake member may have any shape as long as it is movable in the longitudinal direction within the shaft cylinder by gravity. Further, the knock ring 100 as a rotating member may have a C-shape that is not a complete annular shape, or may have any shape as long as it can move together with the operating section and rotate around the central axis. Then, when the front end of the shaft cylinder 4 is directed upward, the brake rod 90 moves rearward, the rotation of the knock ring 100 is restricted, and the knock ring 100 is locked with the locking portion. As long as the forward movement of the operating section is thereby prevented, the brake member and the rotating member can have any shape.

By the way, if the writing instrument 1 is accidentally dropped while the front end of the writing instrument 1 is facing upward, a strong impact in the axial direction will be applied to the operating section. At this time, the slope 24a of the second inner protrusion 24 of the inner cylinder 20 collides with the front end surface of the second outer protrusion 103 of the knock ring 100, and the second inner protrusion 24 deforms so as to swell in the circumferential direction. In this case, the deformed second inner protrusion 24 may not be able to pass between the adjacent second outer protrusions 103 of the knock ring 100, as shown in FIG. 18(B), and there is a possibility that a knocking operation cannot be performed. Moreover, even if the deformed second inner protrusion 24 were able to pass between the adjacent second outer protrusions 103 of the knock ring 100, the deformed second inner protrusion 24 would be caught between the second outer protrusions 103, There is a possibility that the operating section may not be able to return to its original position. This will be explained with reference to FIG. 20.

FIG. 20 is another schematic diagram illustrating the operation of the knock ring 100. 20 is a diagram similar to FIG. 18, and in FIG. 20, the upper side is the rear side of the writing instrument 1, and the lower side is the front side of the writing instrument 1. The knock ring 100 shown in FIG. 20 has a second outer protrusion 103 corresponding to a second inner protrusion 24 passing between the adjacent second outer protrusions 103, that is, the right side in the figure. The second outer protrusion 103 is formed shorter in the axial direction. That is, the front end surface of the second outer protrusion 103 on the right side in the figure is formed to be located more rearward than the front end surface of the other second outer protrusion 103.

FIG. 20(A) shows the rear end surface of the second inner protrusion 24 of the inner cylinder 20 that does not pass between the adjacent second outer protrusions 103 when the writing instrument 1 falls, and the second outer protrusion 103 of the corresponding knock ring 100. This shows the moment of collision with the front end surface. At this time, the other second inner protrusion 24 of the inner cylinder 20 collides with the second outer protrusion 103 of the corresponding knock ring 100 because the front end surface of the second outer protrusion 103 is disposed further rearward. I haven't. In FIG. 20(B), as a result of the collision, the second inner protrusion 24 of the inner cylinder 20 that does not pass between the adjacent second outer protrusions 103 has a deformed portion 24c. At this time, since the second inner protrusion 24 of the other inner cylinder 20 is not deformed, it can pass between the adjacent second outer protrusions 103 and does not affect the knocking operation.

By the way, in a normal knocking operation, when the rear end surface of the second inner protrusion 24 of the inner cylinder 20 and the front end face of the second outer protrusion 103 of the knock ring 100 come into contact, the second inner protrusion of the inner cylinder 20 The protrusion 24 and the second outer protrusion 103 of the knock ring 100 may engage with each other, and the knock ring 100 may become unable to rotate. This will be explained with reference to FIG. 21.

FIG. 21 is another schematic diagram illustrating the operation of the knock ring 100. 21 is a diagram similar to 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 angle α of the front end of the second outer protrusion 103 of the knock ring 100, especially the second outer protrusion 103 on the left side in the figure, is set in the range of 45 degrees to 90 degrees, so that the inner cylinder 20 Unintended engagement between the second inner protrusion 24 and the second outer protrusion 103 of the knock ring 100 can be prevented.

As described above, by performing the knocking operation, the operating member 70, rotor 80, and rotating cam 50 move forward. When the rotary cam 50 moves forward, it is pressed by the claw portion 52, and the sliding piece 60 having the slider 62 disposed in the cutout portion 43 of the collar member 40 and the collar member 40 move forward. Move to. As a result, the writing portion 5a of the refill 5 connected to this sliding piece 60 protrudes from the shaft tube 4. The operation of protruding a predetermined refill 5 will be explained with reference to FIG. 22.

FIG. 22 is a schematic diagram illustrating a refill operation during a knock operation. As described above, each of the sliders 62 of the sliding piece 60 is arranged between the first cam surface 44 and the second cam surface 56, and in FIG. 22, these are expanded in the circumferential direction. As shown, in each figure, the left and right sides are connected. Each of the sliding pieces 60 cooperates with the first cam surface 44 and the second cam surface 56. The circle marked on one of the three sliding pieces 60 is a mark drawn for convenience to identify the sliding piece 60. In FIG. 22, the upper side is the rear side of the writing instrument 1, and the lower side is the front side of the writing instrument 1. FIG. 22(A) shows the collar member 40, rotating cam 50, and sliding piece 60 in a non-writing state of the writing instrument 1, and FIG. 22(B) shows the collar member 40, rotating cam 50 immediately after the start of the knocking operation. and a sliding piece 60, and FIG. 22(C) shows the collar member 40, the rotary cam 50, and the sliding piece 60 in the writing state of the writing instrument 1.

When a knocking operation is performed from the state shown in FIG. The sliding piece 60 and the collar member 40 move forward (FIG. 22(B)). Next, when the rotary cam 50 moves further, the first inner cam 83 of the rotor 80 and the first outer cam 23 of the inner cylinder 20 cooperate with each other as described above, and the writing instrument 1 enters the writing state (see FIG. 22). C)).

As is clear from FIG. 22, by the knocking operation, the refill 5 connected to the sliding piece 60, which is moving relatively forward among the three refills 5, protrudes from the front end opening of the barrel 4, and the writing instrument 1 It becomes a writing state. Therefore, in the non-writing state of the writing instrument 1, by arranging the writing part 5a of the refill 5, which is relatively moving forward, in the vicinity of the front end opening of the barrel barrel 4, the amount of knock operation can be reduced. With a smaller knock stroke, the refill 5 can be protruded into a writing state. Further, during a knocking operation, the second cam surface 56 of the rotary cam 50 moves forward and presses the sliding piece 60, so that rattling between the parts can be suppressed. Furthermore, the rotary cam 50, particularly the claw portion 52, can be a relatively large component, and its strength can be increased.

FIG. 23 is a schematic diagram illustrating the switching operation of the refill 5 that can appear, that is, the operation for changing the refill 5 used for writing. 23 is a diagram similar to 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 to the front shaft 2. On the other hand, the inner cylinder 20, the collar member 40, the rotary cam 50, and the rear shaft 3 are rotatable with respect to the front shaft 2, and constitute a rotation selection member. In other words, the front shaft 2 is rotatable with respect to the rear shaft 3.

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

FIG. 23(A) shows a state in which the sliding piece 60A is placed in a forward position in the writing instrument 1 in a non-writing state. When a knocking operation is performed in this state, the refill 5 connected to the sliding piece 60A enters the writing state as described above.

When the rear shaft 3 is rotated clockwise relative to the front shaft 2 when viewed from the rear of the writing instrument 1 in the state shown in FIG. 23(A), each of the sliding pieces 60 moves to the right in the figure. Move relatively. At this time, with the rotation of the rear shaft 3, that is, the rotation of the collar member 40, the sliding piece 60A that has been placed in the forward position moves backward along the slope of the first cam surface 44, and the sliding piece 60A moves backward along the slope of the first cam surface 44. 60B rides on the protrusion 42 against the biasing force of the front spring 11 (FIG. 23(B)). As the sliding piece 60B rides on the raised portion 42, the collar member 40 has moved forward by the height of the raised portion 42 compared to the state shown in FIG. 23(A).

Furthermore, when the rear shaft 3 is rotated, the sliding piece 60B moves relatively circumferentially along the raised portion 42, and the sliding piece 60C moves forward along the end surface 55 of the rotary cam 50 (Fig. 23(C)). Next, at the moment when the sliding piece 60B exceeds the end of the raised part 42, the collar member 40, which had been moved forward by the height of the raised part 42, is momentarily moved backward by the biasing force of the front spring 11. (FIG. 23(D)). At this time, the sliding piece 60B collides with the rear end surface of the collar member 40. At the same time, the sliding piece 60C collides with the end face of the notch 43 of the collar member 40. At the same time, the sliding piece 60A collides with the front end surface 27 of the inner cylinder 20. As a result, the sliding piece 60C is placed in the notch 43 of the collar member 40, and switching of the refill 5 is completed (FIG. 23(E)). Since these collisions occur almost simultaneously, the user who was rotating the rear shaft 3 can feel the impact and the clicking sound caused by the impact, indicating that the switching operation of the retractable refill 5 has been completed. can be recognized. Note that the raised portion 42 may be omitted.

The torque required to start rotating the rear shaft 3 in order to switch the retractable refill 5, that is, the initial torque, can be determined by changing the height of the stepped raised portion 42, the shape of the stepped portion, etc. can be changed to a desired value. By appropriately adjusting the initial torque in consideration of the frictional resistance caused by the movement of the sliding piece 60, when a torque higher than the initial torque is applied and rotated, the subsequent inertia force instantly causes the refill 5 to move toward the adjacent refill 5. It is possible to cause the switching to take place.

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

Further, even if the writing instrument 1 is changed from the writing state to the non-writing state by a knock operation, the same refill 5 remains in the selected position unless the rotation selection member is rotated as explained with reference to FIG. . Therefore, for example, after writing in black, if you perform a knock operation to switch to a non-writing state and then try to write in black again, you can use a single refill without having to select the operation part corresponding to each refill. The black refill 5 can be put into the writing state again by simply knocking the operating section. In other words, the same refill 5 can repeatedly appear and disappear by knocking a single operation part without having to search for a predetermined operation part each time to make the desired refill 5 protrude from a plurality of operation parts. can be done easily. On the other hand, switching the refill 5 to the writing state by the knocking operation can be easily done by rotating the rotation selection member around the axis, as described above.

Moreover, since each of the sliding pieces 60 moves in the front-back direction by rotating the rotation selection member around the axis, a plurality of springs that individually bias each of the refills 5 connected to the sliding piece 60 are used. There is no need to place That is, with a single front spring 11, a dual-type and knock-type writing instrument can be realized. As a result, the writing instrument 1 can reduce the ratio of the protruding/retracting mechanism and the refill selection mechanism to the total length in the axial direction, and can also make the outer diameter of the writing instrument 1 thinner, and can have a simple mechanism. . Further, by arranging the single front spring 11 outside the spacer 30, that is, near the inner peripheral surface of the shaft cylinder 4, it is possible to prevent the refill 5 from coming into contact with the front spring 11 and being damaged. That is, since the rail portion 32 of the spacer 30 covers a large portion of the outer peripheral surface of the refill 5 facing outward in the radial direction, the refill 5 does not come into contact with the front spring 11. Furthermore, since a plurality of operation parts are not arranged on the outer circumferential surface of the writing instrument 1, there are few irregularities, and a pattern can be printed or decorations can be applied.

By the way, according to the writing instrument 1, it is possible to easily specify the refill 5 that is desired to be in the writing state or identify the refill 5 that is in the writing state. This will be explained with reference to FIGS. 1 to 4.

As described above, the first window portion 111 and the second window portion 112 are formed in the rear shaft 3, and the inside of the shaft cylinder 4 is visible from the outside. Therefore, a part of the colored band 38 provided on the main body part 31 of the spacer 30 can be visually recognized through the first window part 111. In other words, in the barrel 4, the first window is located in the colored band 38 at a position where the section corresponding to the refill 5 that enters the writing state by the knocking operation, that is, the section corresponding to the refill 5 that is in the writing state is visible. A section 111 is provided. Therefore, by checking the division of the colored band 38 that is visible from the first window 111, it is possible to determine which refill 5 will be in the writing state by a knock operation when it is in the non-writing state, or which refill 5 will be in the writing state. You can identify whether it is in If the refill 5 identified through the first window 111 in the non-writing state is not the desired refill 5 desired to be in the writing state, operate the rotation selection member as described above, A desired refill 5 may be placed at the above-mentioned selected position.

In this embodiment, each of the sliding pieces 60, particularly the outer surface of each slider 62, is colored in a color corresponding to the connected refill 5, for example, in the same color as the writing color. One of the sliding pieces 60 is visible through the second window 112. In other words, as shown in FIG. 3, in the barrel 4, the sliding piece 60 connected to the refill 5 in the writing state, that is, the sliding piece 60 moving relatively forward, is in a visible position. A second window portion 112 is provided.

Note that, unlike the colored band 38 of the spacer 30, each of the sliding pieces 60 moves in the front-back direction depending on the writing state or non-writing state of the connected refill 5. Therefore, in the present embodiment, when the refill 5 placed at the selected position is in the writing state, the sliding piece 60 is visible through the second window 112, whereas the sliding piece 60 is visible when the refill 5 placed at the selected position is in the writing state. When the placed refill 5 is in a non-writing state, the sliding piece 60 cannot be visually recognized. Therefore, on the contrary, when the refill 5 placed at the selected position is in the non-writing state, the sliding piece 60 is visible, and the refill 5 placed at the selected position is in the writing state. In some cases, the second window portion 112 may be formed at a position where the sliding piece 60 is not visible, that is, at a position further rearward in the shaft tube 4. Note that the second window portion 112 may be formed longer in the axial direction so that the sliding piece 60 can be visually recognized at all times.

As shown in FIG. 1, three third windows 113, which are through holes, are formed at equal intervals along the circumferential direction at the tapered front end of the front shaft 2. The inside of the shaft tube 4 is visible from the outside through the third window portion 113. In this embodiment, any part of the refill 5, for example, the joint 5b that connects the ballpoint pen tip at the tip and the ink storage tube, is colored to correspond to the refill 5, for example, the same color as the writing color. The joint 5b is visible through the third window 113. In other words, as shown in FIG. 3, the third window 113 is provided in the barrel 4 at a position where the joint 5b of the refill 5 in the writing state can be visually recognized.

Note that, unlike the colored band 38 of the spacer 30, each of the joints 5b moves in the front-back direction depending on the writing state or non-writing state of the refill 5. Therefore, in the present embodiment, when the refill 5 placed at the selected position is in the writing state, the joint 5b is visible through the third window 113, whereas the joint 5b is visible when the refill 5 placed at the selected position is in the writing state. When the refill 5 is in a non-writing state, the joint 5b is not visible. Therefore, on the contrary, when the refill 5 placed at the selected position is in the non-writing state, the joint 5b is visible, and when the refill 5 placed at the selected position is in the writing state, the joint 5b is visible. The third window portion 113 may be formed at a position where the joint 5b is not visible, that is, at a position further rearward in the shaft tube 4. Note that the third window portion 113 may be formed longer in the axial direction so that the joint 5b can be visually recognized at all times. By forming the three third windows 113, the joint 5b can be visually recognized through any of the third windows 113, no matter how the user holds the writing instrument 1. However, one, two, or four or more through holes may be provided as the third window portion 113.

The first window section 111, the second window section 112, and the third window section 113 constitute a window section. Furthermore, each section of the colored band 38 of the spacer 30 constitutes a first identification part, each of the colored sliding pieces 60 constitutes a second identification part, and each of the colored joints 5b constitutes a third identification part. Configure. Each of the identification sections constitutes an identification section that enables identification of each of the plurality of refills 5. Note that the identification section may identify the plurality of refills 5 by gloss, shape, etc. instead of or in addition to color. Instead of indicating the writing color, the identification section may identify the type of writing, for example, a refill containing thermochromic ink and a refill containing non-thermochromic ink.

In the embodiment described above, the first window section 111, the second window section 112, and the third window section 113 were included as the window sections, but it is also possible to have any one or any two of them. . Further, in the case where at least the second window section 112 and the third window section 113 are provided, when the refill 5 placed at the selected position is in a non-writing state, the identification section is visible and the selected When the refill 5 placed at the selected position is in the writing state, the identification part is provided at a position that cannot be seen, and the other is provided at a position where the identification part is not visible when the refill 5 placed at the selected position is in the writing state. The identification part may be provided at a position where it is visible and cannot be seen when the refill 5 placed at the selected position is in a non-writing state.

In the embodiment described above, the window portion was a through hole. However, as long as the shaft tube 4 is configured so that the inside thereof cannot be visually recognized except for the window, the window can be configured as desired. For example, the window portion may be formed by forming the shaft tube 4 from a transparent or semi-transparent resin and covering the portion other than the portion corresponding to the window portion with an opaque seal or paint. In this case, the brand name of the writing instrument, a cautionary note, etc. can be attached to the opaque seal or coating.

In the embodiment described above, the writing instrument 1 has three refills 5, but it may have two or four or more, and one of them may be used as a mechanical pencil or a marking pen instead of a ballpoint pen refill. , a touch pen, an eraser, or other types of writing instruments such as a friction body may be used. Furthermore, although the writing instrument 1 was provided with an erasing member 7 at the rear end portion for erasing the handwriting made by the writing instrument 1, in addition to or in place of this, an erasing member may be provided at a different location on the writing instrument 1. . For example, the erasing member may be provided on a portion of the front shaft 2, such as the front end, or may be provided on the clip.

In the embodiment described above, specific examples of protrusions, grooves, cam structures, etc. are shown, but as long as the same effect is achieved, the structure may be composed of different numbers, shapes, or independent separate parts.

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

As described above, the erasing member 7 includes the first erasing member 7a and the second erasing member 7b. Therefore, each of the first erasing member 7a and the second erasing member 7b can be a different erasing member, such as an eraser, a sand eraser, or a friction body, depending on the type of the plurality of refills 5 of the writing instrument 1. . For example, a mechanical pencil refill, a refill containing a chromatic thermochromic ink, and a refill containing an achromatic thermochromic ink are housed in the barrel 4, and the first erasing member 7a and the second erasing member 7a One of the members 7b may be an eraser that does not contain phthalic acid, and the other may be a friction body, thereby creating an erasing member that has less burden on the environment. Further, a refill for a mechanical pencil, a refill containing a chromatic thermochromic ink, and a refill containing an achromatic non-thermochromic ink may be accommodated in the barrel 4. Further, the holding member 6 or the cover member 8 may be used as an erasing member. In this case, each of the holding member 6, the erasing member 7, and the cover member 8 may be a different erasing member depending on the type of the plurality of refills 5 of the writing instrument 1, or at least two may be the same erasing member. .

The first erasing member 7a and the second erasing member 7b may be the same erasing member made of the same material. Thereby, even if one of the first erasing member 7a and the second erasing member 7b is worn out due to use, the other can be used as a spare. Furthermore, the ends of the first erasing member 7a and the second erasing member 7b may have the same shape. Further, since the first erasing member 7a and the second erasing member 7b have different shapes, they may be used depending on the range to be erased. For example, by using the rounded edge of the first erasing member 7a, a wider range of handwriting can be erased. On the other hand, by using the edge of the second erasing member 7b that is not rounded compared to the edge of the first erasing member 7a, it is possible to erase a narrower range, that is, finer handwriting. By removing the erasing member 7 from the holding member 6, the flange portion 7c can also be used. Furthermore, the end portions of the first erasing member 7a and the second erasing member 7b may have a shape other than that of this embodiment, such as a truncated cone shape or a prismatic shape.

Here, thermochromic ink maintains a predetermined color (first color) at room temperature (e.g. 25°C) and changes to a different color (second color) when heated to a predetermined temperature (e.g. 60°C). This refers to ink that has the property of returning to its original color (first color) when it is cooled to a predetermined temperature (for example, -5° C.). In the writing instrument 1 using thermochromic ink, the second color is colorless, and the process of increasing the temperature of the drawn line written in the first color (for example, red) to make it colorless is referred to as "erasing" here. . Therefore, the friction body rubs the drawn line against the writing surface or the like to generate frictional heat, thereby turning the drawn line colorless, that is, erasing it. Note that, as a matter of course, the second color may be colored other than colorless.

Thermochromic microcapsule pigments that can be used as thermochromic coloring materials include those that change color due to heat such as frictional heat, for example, those that have the function of changing color from colored to colorless, from colored to colored, from colorless to colored, etc. There are no particular limitations, and various materials can be used, including microencapsulated thermochromic compositions containing at least a leuco dye, a color developer, and a color change temperature regulator.

The leuco dye that can be used is not particularly limited as long as it is an electron-donating dye and functions as a coloring agent. Specifically, in order to obtain inks with excellent coloring properties, conventionally known inks such as triphenylmethane, spiropyran, fluoran, diphenylmethane, rhodamine lactam, indolylphthalide, and leucoauramine are used. They can be used alone (one type) or in combination of two or more types (hereinafter simply referred to as "at least one type").

Specifically, 6-(dimethylamino)-3,3-bis[4-(dimethylamino)phenyl]-1(3H)-isobenzofuranone, 3,3-bis(p-dimethylaminophenyl)-6 -dimethylaminophthalide, 3-(4-diethylaminophenyl)-3-(1-ethyl-2-methylindol-3-yl)phthalide, 3-(4-diethylamino-2-ethoxyphenyl)-3-(1 -ethyl-2-methylindol-3-yl)-4-azaphthalide, 1,3-dimethyl-6-diethylaminofluorane, 2-chloro-3-methyl-6-dimethylaminofluorane, 3-dibutylamino-6 -Methyl-7-anilinofluorane, 3-diethylamino-6-methyl-7-anilinofluorane, 3-diethylamino-6-methyl-7-xylidinofluorane, 2-(2-chloroanilino)-6- Dibutylaminofluoran, 3,6-dimethoxyfluoran, 3,6-di-n-butoxyfluoran, 1,2-benz-6-diethylaminofluoran, 1,2-benz-6-dibutylaminofluoran, 1,2-Benz-6-ethylisoamylaminofluorane, 2-methyl-6-(N-p-tolyl-N-ethylamino)fluorane, 2-(N-phenyl-N--methylamino)-6- (N-p-tolyl-N-ethylamino)fluorane, 2-(3'-trifluoromethylanilino)-6-diethylaminofluorane, 3-chloro-6-cyclohexylaminofluorane, 2-methyl-6- Cyclohexylaminofluorane, 3-di(n-butyl)amino-6-methoxy-7-anilinofluorane, 3,6-bis(diphenylamino)fluorane, methyl-3',6'-bisdiphenylaminofluorane , chloro-3',6'-bisdiphenylaminofluorane, 3-methoxy-4-dodecoxystyrinoquinoline, and the like.

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

The color developer that can be used is a component that has the ability to color the leuco dye, such as phenol resin compounds, salicylic acid metal chlorides, salicylic acid resin metal salt compounds, solid acid compounds, etc. can be mentioned.

Specifically, o-cresol, tert-butylcatechol, nonylphenol, n-octylphenol, n-dodecylphenol, n-stearylphenol, p-chlorophenol, p-bromophenol, o-phenylphenol, hexafluorobisphenol, p - n-butyl hydroxybenzoate, n-octyl p-hydroxybenzoate, resorcinol, dodecyl gallate, 2,2-bis(4'-hydroxyphenyl)propane, 4,4-dihydroxydiphenylsulfone, 1,1-bis (4'-hydroxyphenyl) ethane, 2,2-bis(4'-hydroxy-3-methylphenyl)propane, bis(4-hydroxyphenyl) sulfide, 1-phenyl-1,1-bis(4'-hydroxy phenyl)ethane, 1,1-bis(4'-hydroxyphenyl)-3-methylbutane, 1,1-bis(4'-hydroxyphenyl)-2-methylpropane, 1,1-bis(4'-hydroxyphenyl) ) n-hexane, 1,1-bis(4'-hydroxyphenyl) n-heptane, 1,1-bis(4'-hydroxyphenyl) n-octane, 1,1-bis(4'-hydroxyphenyl) n -nonane, 1,1-bis(4'-hydroxyphenyl)n-decane, 1,1-bis(4'-hydroxyphenyl)n-dodecane, 2,2-bis(4'-hydroxyphenyl)butane, 2 , 2-bis(4'-hydroxyphenyl)ethylpropionate, 2,2-bis(4'-hydroxyphenyl)-4-methylpentane, 2,2-bis(4'-hydroxyphenyl)hexafluoropropane, At least one of 2,2-bis(4'-hydroxyphenyl)n-heptane, 2,2-bis(4'-hydroxyphenyl)n-nonane, and the like can be mentioned.

The amount of the color developer to be used may be arbitrarily selected depending on the desired color density and is not particularly limited, but is usually 0.1 to 1 part by mass per 1 part by mass of the above-mentioned leuco dye. It is suitable to select within a range of about 100 parts by mass.

The color change temperature adjusting agent that can be used is a substance that controls the color change temperature in the color development of the above-mentioned leuco dye and color developer. As the discoloration temperature adjusting agent that can be used, conventionally known ones can be used. Specific examples include alcohols, esters, ketones, ethers, acid amides, azomethines, fatty acids, and hydrocarbons.

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

The amount of the discoloration temperature regulator to be used may be appropriately selected depending on the desired hysteresis width and color density during color development, and is not particularly limited, but is usually based on 1 part by mass of the leuco dye. , preferably within a range of about 1 to 100 parts by mass.

The thermochromic microcapsule pigment is obtained by microcapsulating a thermochromic composition containing at least the above leuco dye, color developer, and color change temperature regulator so that the average particle size is 0.1 to 5 μm. can be manufactured. Examples of microencapsulation methods include interfacial polymerization, interfacial polycondensation, in situ polymerization, in-liquid curing coating, phase separation from aqueous solutions, phase separation from organic solvents, melting and dispersion cooling, and in-air cooling. Examples include a suspension coating method and a spray drying method, which can be appropriately selected depending on the application.

For example, in the phase separation method from an aqueous solution, a leuco dye, a color developer, and a discoloration temperature regulator are heated and melted, then added to an emulsifier solution, heated and stirred to disperse in the form of oil droplets, and then, as a capsule membrane agent, Using a resin raw material, for example, gradually adding an amino resin solution, an isocyanate resin solution, etc., and subsequently reacting, the dispersion is filtered to produce the desired thermochromic microcapsule pigment. be able to.

The contents of these leuco dyes, color developers, and color change temperature regulators vary depending on the type of leuco dye, color developer, and color change temperature regulator used, and the microencapsulation method, but for the dye 1, The mass ratio is 0.1 to 100 for the color developer and 1 to 100 for the color change temperature regulator. Furthermore, the mass ratio of the capsule membrane agent to the capsule contents is 0.1 to 1.

Thermochromic microcapsule pigments can be produced by suitably combining the types, amounts, etc. of the leuco dye, color developer, and color change temperature regulator, so that the color development temperature of each color (for example, color development at -20°C or higher) and color decolorization temperature can be adjusted. (For example, decolorization at 60° C. or higher) can be set at a suitable temperature, and it is preferable that the color changes from colored to colorless due to heat such as frictional heat.

In the thermochromic microcapsule pigment, the wall film is preferably formed of urethane resin, urea/urethane resin, epoxy resin, or amino resin from the viewpoint of further improving drawing density, storage stability, and writability. Examples of the urethane resin include compounds of isocyanate and polyol. Examples of epoxy resins 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 is appropriately determined depending on the required strength of the wall film and the density of drawn lines.

The average particle diameter of the thermochromic microcapsule pigment is determined in terms of colorability, color development, easy decolorization, stability, fluidity in ink, as well as suppressing adverse effects on writability and photochromic properties as described below. From the viewpoint of compatibility with microcapsule pigments, the thickness is preferably 0.1 to 5 μm, more preferably 0.3 to 3 μm. The "average particle diameter" defined here is the value obtained by measuring the average particle diameter (50% diameter) using a particle size analyzer [Microtrac HRA9320-X100 (manufactured by Nikkiso Co., Ltd.)] (refractive index 1.8). It is.

If the average particle size is less than 0.2 μm, sufficient line density cannot be obtained, while if it exceeds 5 μm, the writing performance deteriorates, the dispersion stability of the thermochromic microcapsule pigment decreases, and the ink is affected by vibrations. This is undesirable as backing tends to occur. Furthermore, the 90% diameter is 8 μm or less, preferably 6 μm or less. When a certain proportion or more of particles with large diameters are present, the above-mentioned influence tends to become more pronounced. Note that the average particle diameter of the microcapsule pigment in the above-mentioned range (0.1 to 5 μm) varies depending on the microcapsule method, but in the phase separation method from an aqueous solution, stirring during production of the microcapsule pigment It can be prepared by suitably combining conditions.

The specific gravity of the thermochromic microcapsule pigment is in the range of 0.9 to 1.3, preferably 1.0 to 1.2. When the specific gravity is outside this range, the dispersion stability of the microcapsule pigment tends to decrease. Further, microcapsule pigments with a specific gravity exceeding 1.3 are likely to cause ink back due to vibration.

In the aqueous ink composition for writing instruments, in addition to the above-mentioned thermochromic microcapsule pigment, the balance is water as a solvent (tap water, purified water, distilled water, ion exchange water, pure water, etc.), and ink compositions for each writing instrument (ballpoint pen). Water-soluble organic solvents, thickeners, lubricants, rust preventives, preservatives, or antibacterial agents may be added as appropriate depending on the intended use (e.g., for marking pens, marking pens, etc.), to the extent that their effectiveness is not impaired. can.

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

Among these, glycerin is preferably used for the purpose of suppressing ink solidification in the writing area due to ink back, and the amount added is preferably 1 to 10% by mass based on the total amount of ink. Although the mechanism of action of glycerin is unknown, it is presumed that it has the effect of reducing the cohesive force between 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. Specifically, gum arabic, gum tragacanth, guar gum, locust bean gum, alginic acid, carrageenan, gelatin, xanthan gum, welan gum, succinoglycan, diutan gum, dextran, methylcellulose, ethylcellulose, hydroxyethylcellulose, carboxymethylcellulose, starch glycolic acid, and its salts, alginate propylene glycol ester, polyvinyl alcohol, polyvinylpyrrolidone, polyvinyl methyl ether, polyacrylic acid and its salts, carboxyvinyl polymers, polyethylene oxide, copolymers of vinyl acetate and polyvinylpyrrolidone, crosslinked acrylic acid polymers, Examples thereof include salts thereof, non-crosslinked acrylic acid polymers and salts thereof, styrene acrylic acid copolymers and salts thereof, and the like.

Among these, it is preferable to use polysaccharides. Due to its rheological properties, polysaccharides tend to be less susceptible to the influence of vibration on their fluidity, and are less prone to problems such as poor writing due to ink back. In particular, xanthan gum is preferable because it has an excellent balance with other properties required for writing instrument ink.

As lubricants, fatty acid esters of polyhydric alcohols, which are also used as surface treatment agents for pigments, higher fatty acid esters of sugars, polyoxyalkylene higher fatty acid esters, alkyl phosphoric acid esters, alkyl sulfonates of higher fatty acid amides, and alkylaryl sulfones are used as lubricants. Examples include acid salts, polyalkylene glycol derivatives, fluorosurfactants, and polyether-modified silicones. Further, examples of rust preventives include benzotriazole, tolyltriazole, dicyclohexylammonium nitrite, and saponins. Examples of preservatives or antibacterial agents include phenol, sodium omazine, sodium benzoate, and benzimidazole compounds.

In order to produce this aqueous ink composition for writing instruments, conventionally known methods can be adopted. For example, in addition to the thermochromic and photochromic microcapsule pigments, predetermined amounts of each of the above aqueous components are added. It is obtained by blending and stirring and mixing using a stirrer such as a homomixer or a disper. Further, if necessary, coarse particles in the ink composition may be removed by filtration or centrifugation.

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

The surface tension of the aqueous ink composition for writing instruments is preferably 25 to 45 mN/m, more preferably 30 to 40 mN/m. Within this range, the wettability of the inside of the pen tip and the ink will be appropriately balanced, making it possible to prevent ink back from occurring.

In the refill, an ink follower may be placed immediately behind the ink. The material constituting the follower may include at least a nonvolatile or hardly volatile organic solvent and a thickener. The nonvolatile or hardly volatile organic solvent used in the ink follower is used as a base oil for the ink follower, and for example, liquid paraffin is used. As the liquid paraffin, mineral oil or chemically synthesized oil can be used, and as the chemically synthesized oil, polybutene, polyα-olefin, ethylene α-olefin oligomer, etc. can be used.

Specific mineral oils that can be used include, for example, commercially available Diana process oils NS-100, PW-32, PW-90, NR-68, and AH-58 (manufactured by Idemitsu Kosan Co., Ltd.).

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

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

Specific examples of ethylene α-olefin oligomers that can be used include commercially available Lucant HC-10, HC-20, HC-100, HC-150, (HC-600, HC-2000) (all of which are manufactured by Mitsui). (manufactured by Kagakusha), etc.

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

Examples of thickeners used in the ink follower include calcium salts of phosphoric acid esters, fine particle silica, polystyrene-polyethylene/butylene rubber-polystyrene block copolymers, polystyrene-polyethylene/propylene rubber-polystyrene block copolymers, and hydrogenated styrene. -butadiene rubber, a block copolymer of styrene-ethylene butylene-olefin crystals, a block copolymer of olefin crystals-ethylene butylene-olefin crystals, and acetalkoxyaluminum dialkylate, and one or more of these can be used.

Preferred commercially available calcium salts of phosphate esters that can be used include Crodax DP-301LA (manufactured by Crodax Japan). Particulate silica that can be used includes hydrophilic particulate silica and hydrophobic particulate silica, and preferred commercial products of hydrophilic silica include AEROSIL-300 and AEROSIL-380 (manufactured by Nippon Aerosil Co., Ltd.), and Preferred commercially available hydrophobic silicas include AEROSIL-974D and AEROSIL-972 (manufactured by Nippon Aerosil Co., Ltd.).

Preferred commercially available polystyrene-polyethylene/butylene rubber-polystyrene block copolymers include Kraton GFG-1901X, Kraton GG-1650 (manufactured by Shell Japan), Septon 8007, Septon 8004 (manufactured by Kuraray), etc. can be mentioned. Further, preferred commercially available polystyrene-polyethylene/propylene rubber-polystyrene block copolymers include Kraton GG-1730 (manufactured by Shell Japan), Septon 2006, and Septon 2063 (all manufactured by Kuraray).

Preferred commercially available hydrogenated styrene-butadiene rubbers include DYNARON 1320P, DYNARON 1321P (manufactured by JSR), Tuftec HI041, Tuftec HI141 (manufactured by Asahi Kasei Industries, Ltd.), and the like.

Preferred commercially available block copolymers of styrene-ethylene butylene-olefin crystals include DYNARON4600P (manufactured by JSR), and preferred commercially available block copolymers of olefin crystals-ethylene butylene-olefin crystals include DYNARON6200P and DYNARON6201B ( (manufactured by JSR), etc.

Preferred commercially available acetalkoxyaluminum dialkylates include PreneAct AL-M (manufactured by Ajinomoto Fine Techno Co., Ltd.).

Among these thickeners, thermoplastic olefin elastomers such as block copolymers of styrene-ethylene butylene-olefin crystals and block copolymers of olefin crystals-ethylene butylene-olefin crystals are preferred in order to further exhibit the effects of the present invention. Use is preferred.

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

Here, tan δ is a value meaning loss modulus/storage modulus, and conventionally, the average value of tan δ values measured for each frequency while increasing exponentially in the frequency region "1 to 63 rad/s" It was known that it is preferable that the value is 1.0 or less. In the present invention, by setting the average value of the tan δ values measured for each frequency from 1 to 63 rad/s to be 1.0 or more, it is possible to absorb vibrations and prevent the occurrence of ink back.

Further, it is preferable that the friction body is colored with a color having a lower brightness value than the color of the thermochromic ink contained in the writing instrument 1. That is, when the thermochromic ink of the writing instrument 1 is transferred to the surface of the friction body without changing color when the friction body is used, the transfer of the thermochromic ink can be made inconspicuous. In particular, by setting the color of the friction body to black or having a brightness value of 2.5 or less, stains on the surface due to use of the friction body can be made less noticeable.

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

It is preferable that 50% by mass or more of polypropylene resin is used as the material constituting the friction body, and the tensile modulus of elasticity (JIS K 7161:2014-1) of the friction body is 70 MPa or more.
By using a friction body with this characteristic, there is less resistance when rubbing handwriting formed with thermochromic ink to discolor or erase the color, and sufficient frictional heat can be obtained even with a light force. This also makes it easier to erase small parts.

Polypropylene resins that can be used are those that serve as the base material of the friction body, and include, for example, propylene homopolymers, propylene and small amounts of other α-olefins (e.g., ethylene, 1-butene, 1-hexene, 1 -octene, 4-methyl-1-pentene, etc.) (including block copolymers and random copolymers). As the polypropylene resin, one type or a mixture of two or more of these can be used.
The effects of this embodiment can be exhibited by using the polypropylene resin in an amount of 50% by mass or more based on the total amount of the friction body.

Examples of resins that can be used other than the polypropylene resins mentioned above include polyethylene and ionomers. These resins are desirably contained in an amount of 0.5 to 30% by mass based on the total amount of the friction body in order to further exhibit the effects of this embodiment.

Furthermore, the materials constituting the friction body are preferably rosin resin, terpene resin, petroleum resin, phenolic resin, coal, etc., in order to adjust the tackiness and generate sufficient frictional heat even with a light force. At least one resin selected from xylene-based resins and xylene-based resins can be contained.
Among these resins, resins with a molecular weight of several hundred to several thousand are selected and added to the blending system of polypropylene resin, which is the main component of the friction body, to impart tackiness to the friction body. The effect can be further demonstrated. Specifically, natural resins such as rosin-based resins and terpene-based resins, petroleum-based resins, phenolic resins, coal-based resins, xylene-based resins, etc., preferably have a molecular weight of 500 to 5000, more preferably 700 to 4000. The various resins mentioned above can be used.

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

Petroleum-based resins are, for example, a mixture of cracked oil fractions containing unsaturated hydrocarbons such as olefins and diolefins produced as by-products along with basic petrochemical raw materials such as ethylene and propylene during the thermal decomposition of naphtha in the petrochemical industry. Obtained by polymerization using a Friedel-Crafts type catalyst.
The petroleum resins include aliphatic petroleum resins obtained by (co)polymerizing a C ₅ fraction obtained by pyrolysis of naphtha, and aliphatic petroleum resins obtained by (co)polymerizing a C ₉ fraction obtained by pyrolysis of naphtha. Aromatic petroleum resins obtained by copolymerizing the C ₅ fraction and C ₉ fraction, hydrogenated petroleum resins, alicyclic petroleum resins such as dicyclopentadiene petroleum resins, Examples include petroleum resins such as styrene resins such as styrene, substituted styrene, and copolymers of styrene and other monomers.
The _C5 fraction obtained by thermal decomposition of naphtha usually contains olefins such as 1-pentene, 2-pentene, 2-methyl-1-butene, 2-methyl-2-butene, and 3-methyl-1-butene. Hydrocarbons, diolefin hydrocarbons such as 2-methyl-1,3-butadiene, 1,2-pentadiene, 1,3-pentadiene, 3-methyl-1,2-butadiene, and the like are included.
In addition, aromatic petroleum resin obtained by (co)polymerizing _C9 fraction is a resin obtained by polymerizing an aromatic group having 9 carbon atoms with vinyltoluene and indene as main monomers, and Specific examples of the C ₉ fraction obtained by the method include styrene analogs such as α-methylstyrene, β-methylstyrene, and γ-methylstyrene, and indene analogs such as indene and coumaron.
Product names include Petrozine manufactured by Mitsui Chemicals, Petrite manufactured by Mikuni Chemical, Neopolymer manufactured by JX Nippon Oil & Energy, Petcol manufactured by Tosoh, and Petrotac.

Furthermore, a modified petroleum resin obtained by modifying a petroleum resin made of the _C9 fraction is preferably used in this embodiment as a resin that has both high adhesion and long-lasting adhesion.
Examples of modified petroleum resins include C9 petroleum resins modified with unsaturated alicyclic compounds, _C9 petroleum resins modified with compounds having hydroxyl groups, _C9 petroleum resins modified with unsaturated carboxylic acid compounds, etc. .
Preferred unsaturated alicyclic compounds include cyclopentadiene, methylcyclopentadiene, etc. Diels-Alder reaction products of alkylcyclopentadiene include dicyclopentadiene, cyclopentadiene/methylcyclopentadiene co-dimer, tricyclopentadiene, etc. are mentioned, with dicyclopentadiene being particularly preferred.
The dicyclopentadiene-modified C ₉ petroleum resin can be obtained by thermal polymerization or the like in the presence of both dicyclopentadiene and the C ₉ fraction.
Examples of the dicyclopentadiene-modified C ₉ petroleum resin include Neopolymer 130S manufactured by JX Nippon Oil & Energy Corporation.

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

Hydroxyl group-containing C9 _- based petroleum resins can be produced by thermally polymerizing (meth)acrylic acid alkyl esters together with petroleum fractions to introduce ester groups into the petroleum resin, and then reducing the ester groups. It can also be produced by a method in which a double bond remains or is introduced and then the double bond is hydrated.
In addition, as the hydroxyl group-containing _C9 petroleum resin, those obtained by various methods as mentioned above can be used, but from the viewpoint of performance and production, it is preferable to use phenol-modified petroleum resin, etc. Petroleum resins are obtained by cationic polymerization of _C9 fractions in the presence of phenol, are easy to modify, and are inexpensive.
Examples of the phenol-modified C ₉ petroleum resin include Neopolymer-E-130 manufactured by JX Nippon Oil & Energy Corporation.

Further, as the C ₉ petroleum resin modified with an unsaturated carboxylic acid compound, a C ₉ petroleum resin modified with an ethylenically unsaturated carboxylic acid can be used.
Representative examples of such ethylenically unsaturated carboxylic acids include maleic acid (anhydride), fumaric acid, itaconic acid, tetrahydrophthalic acid (anhydride), (meth)acrylic acid, and citraconic acid.
The unsaturated carboxylic acid-modified C ₉ petroleum resin can be obtained by thermally polymerizing a C ₉ petroleum resin and an ethylenically unsaturated carboxylic acid. In this embodiment, maleic acid-modified _C9 petroleum resin is preferred.

Examples of the unsaturated carboxylic acid-modified C ₉ petroleum resin include Neopolymer 160 manufactured by JX Nippon Oil & Energy Corporation.
Further, a copolymer resin of a C ₅ fraction and a C ₉ fraction obtained by thermal decomposition of naphtha can be suitably used.
Here, the _C9 fraction is not particularly limited, but is preferably a _C9 fraction obtained by thermal decomposition of naphtha.
Specific examples include Struktol series TS30, TS30-DL, TS35, and TS35-DL manufactured by SCHILL & SEILACHER.

Examples of the phenolic resin include alkylphenol formaldehyde resin and its modified rosin, alkylphenol acetylene resin, modified alkylphenol resin, and terpene phenol resin. (manufactured by Kasei Kogyo Co., Ltd.), pt-butylphenol acetylene resin (trade name Colesin (manufactured by BASF), etc.).
Furthermore, examples of the coal-based resin include coumaron indene resin, and examples of the xylene-based resin include xylene formaldehyde resin.
In addition, polybutene can also be used as a resin having tackifying properties.
Among these resins, from the viewpoint of adhesiveness and adhesive persistence, copolymer resins of C ₅ fraction and C ₉ fraction, aromatic petroleum resins obtained by (co)polymerizing C ₉ fractions, Phenolic resins and coumaron indene resins are preferred.

The softening point of these resins is preferably 200°C (measurement method: ASTM E28-58-T) or lower, and more preferably in the range of 80 to 150°C.
When the softening point exceeds 200°C, processability may be deteriorated, and when the softening point is below 80°C, adhesive performance may deteriorate. From these viewpoints, the softening point is more preferably in the range of 90 to 120°C. The above resins may be used alone or in combination of two or more.

The blending amount of at least one resin selected from the above rosin resin, terpene resin, petroleum resin, phenol resin, coal resin, and xylene resin used for the purpose of adjusting these tackiness is determined according to the present embodiment. In order to further exhibit the above effects, it is desirable that the amount is preferably 0.05 to 20% by mass, more preferably 0.05 to 10% by mass, based on the total amount of the friction body.

In addition to the above-mentioned polypropylene resin, the friction body of this embodiment may optionally contain a heat stabilizer, an oxidation inhibitor, etc., as long as it does not impair the effects of this embodiment. agents, light stabilizers, ultraviolet absorbers, crystal nucleating agents, antiblocking agents, sealing properties improvers, mold release agents (e.g. stearic acid, silicone oil, etc.), lubricants such as polyethylene wax, colorants, pigments, inorganic Fillers (e.g., alumina, talc, calcium carbonate, mica, wallastenite, and clay), blowing agents (organic and inorganic), and flame retardants (e.g., hydrated metal compounds, red phosphorus, ammonium polyphosphate, An appropriate amount of optional components such as antimony compounds, silicon, etc.) can be included.
Further, the material of the friction body may further contain an alkylsulfonic acid phenyl ester or a cyclohexanedicarboxylic acid ester. By containing an alkylsulfonic acid phenyl ester or a cyclohexane dicarboxylic acid ester in the friction body, handwriting can be erased without damaging the paper surface or blurring printed characters.
The friction body of this embodiment can be manufactured using the above-mentioned polypropylene resin, for example, by extrusion molding, injection molding, or the like.

The friction body of this embodiment needs to have a tensile modulus of elasticity (JIS K 7161:2014-1) of 70 MPa or more, and preferably, in order to impart durability and exhibit the effects of this embodiment. is preferably 80 to 5000 MPa. If the tensile modulus is less than 70 MPa, the effects of this embodiment cannot be exhibited, which is not preferable.
The tensile modulus of this friction body can be adjusted to 70 MPa or more by suitably combining the type and amount of the polypropylene resin used, other resin types, their contents, etc.

More preferably, the permanent elongation (JIS K 6273:2006) of the friction body is 50% or more, particularly preferably 50 to 100%, in order to further exhibit the effects of this embodiment and reduce the feeling of resistance. is desirable.
"Permanent elongation" as defined in this embodiment means that the test piece is stretched twice and held at 23° C. for 6 hours, and then the stress is removed. It is the value (%) obtained by dividing the stretched length by the length before stretching.

In addition, in this embodiment, it is desirable that the friction coefficient of the friction body is 0.3 to 0.5 in order to provide an appropriate sense of resistance without excessively slipping.
The "friction coefficient" defined in this embodiment is measured using a commercially available surface property measuring device (HEIDON-14D, Shinto Kagaku Co., Ltd.), and applying a friction body to high-quality paper at a load of 4.9 N and an angle of 90. It refers to the friction coefficient measured by rubbing at a writing speed of 100 mm/min.
The permanent elongation and friction coefficient of the friction body can be adjusted within suitable ranges by suitably combining the amount of the polypropylene resin used, other resin types, their contents, etc.
Note that the friction body can be used as a touch pen or a stylus pen, and may be provided with electrical conductivity.

According to the friction body of this embodiment, compared to conventional elastomers such as styrene-based elastomers, plastic foams, etc., the content of polypropylene resin is 50% by mass or more and the tensile modulus of the friction body is 70 MPa or more. There is less resistance when handwriting formed with thermochromic ink is rubbed to discolor or erase the color, and sufficient frictional heat can be obtained even with a light force, and it is also easy to erase fine parts. It will be able to demonstrate superior functionality that has never existed before.
Further, by setting the permanent elongation of the friction body to 50% or more and/or a friction coefficient of 0.3 to 0.5, the above-mentioned functions can be exhibited even more effectively.

The knock-type writing instrument is equipped with a barrel and an operating part, and is capable of switching between a writing state and a non-writing state by performing a knocking operation of pressing the operating part forward, and the barrel is moved by gravity. further comprising: a brake member movable in the front-rear direction; a rotating member movable together with the operating portion and rotatable around a central axis; and a locking portion capable of locking with the rotating member; When the front end of the brake member is directed upward, the brake member moves rearward, the rotation of the rotary member is restricted, and the rotary member engages with the locking portion, thereby preventing forward movement of the operating portion. A knock type writing instrument may be provided. As a result, the common effect of providing a knock-type writing instrument equipped with a simple mechanism that enables stable scratching operations, etc. is achieved.

At this time, the rotating member may be a cylindrical member. A protrusion may be provided on the inner surface of the rotary member, and the brake member inserted into the rotary member may be engaged with the protrusion, thereby restricting rotation of the rotary member. The rotating member has a first slope inclined in the circumferential direction with respect to a plane perpendicular to the front-rear direction, and the locking part has a second slope inclined in the circumferential direction with respect to the plane perpendicular to the front-rear direction. The rotation member may have a slope, and a first slope of the rotating member whose rotation is regulated may come into contact with a second slope of the locking portion, thereby preventing forward movement of the operating portion. . The first slope or the second slope may have an inclination angle of greater than 45 degrees with respect to the axial direction of the knock-type writing instrument. A writing device comprising a plurality of writing bodies, a sliding member to which each of the writing bodies is connected, and a first cam surface disposed in front of the sliding member and cooperating with each of the sliding members, In this state, at least one of the sliding members and the first cam surface may be separated from each other. All or part of the operating section may be an erasing section capable of erasing handwriting of the knock-type writing instrument. The erasing portion may be a friction body containing 50% by mass or more of a polypropylene resin and having a tensile modulus (JIS K 7161:2014-1) of 70 MPa or more.

1 Writing instrument 4 Shaft tube 5 Refill 5b Joint 7 Erasing member 7a First erasing member 7b Second erasing member 10 Rear spring 11 Front spring 13 I-shaped protrusion 20 Inner cylinder 30 Spacer 38 Colored band 40 Collar member 50 Rotating cam 60 Sliding piece 70 operating member 80 rotor 90 brake rod 100 knock ring 111 first window 112 second window 113 third window

Claims (5)

comprising a barrel, a plurality of writing fonts, an operating section, a rotation selection member, and an identification section corresponding to each of the plurality of writing fonts and disposed inside the barrel;
By operating the rotation selection member to select one of the plurality of cursive fonts and performing a knocking operation of pressing the operating portion forward, the selected cursive font can be put into a writing state or a non-writing state. is a dual writing instrument that can be switched,
A window is formed in the barrel, and the identification part corresponding to the selected cursive is visible through the window,
further comprising a spacer capable of arranging each of the plurality of cursive fonts,
the identification section has a first identification section,
The first identification part is a colored band divided on the outer surface of the spacer corresponding to each of the plurality of cursive letters, and colored corresponding to the divided part,
A double writing instrument characterized in that the colored band corresponding to the cursive hand selected according to the operation of the rotation selection member is visible in both a writing state and a non-writing state. comprising a barrel, a plurality of writing fonts, an operating section, a rotation selection member, and an identification section corresponding to each of the plurality of writing fonts and disposed inside the barrel;
By operating the rotation selection member to select one of the plurality of cursive fonts and performing a knocking operation of pressing the operating portion forward, the selected cursive font can be put into a writing state or a non-writing state. is a dual writing instrument that can be switched,
A window is formed in the barrel, and the identification part corresponding to the selected cursive is visible through the window,
further comprising a plurality of sliding pieces connected to each of the plurality of cursive fonts,
the identification section has a second identification section,
The second identification section is provided on each of the plurality of sliding pieces,
A double writing instrument, characterized in that the plurality of sliding pieces corresponding to the selected writing style are visible only in either a writing state or a non-writing state. comprising a barrel, a plurality of writing fonts, an operating section, a rotation selection member, and an identification section corresponding to each of the plurality of writing fonts and disposed inside the barrel;
By operating the rotation selection member to select one of the plurality of cursive fonts and performing a knocking operation of pressing the operating portion forward, the selected cursive font can be put into a writing state or a non-writing state. is a dual writing instrument that can be switched,
A window is formed in the barrel, and the identification part corresponding to the selected cursive is visible through the window,
Each of the plurality of writing fonts has a ballpoint pen tip, an ink storage tube, and a joint that connects the ballpoint pen tip and the ink storage tube ,
The identification section has a third identification section,
the third identification part is provided on the joint,
A compound writing instrument characterized in that the joint corresponding to the selected writing style is visible only in either a writing state or a non-writing state. comprising a barrel, a plurality of writing fonts, an operating section, a rotation selection member, and an identification section corresponding to each of the plurality of writing fonts and disposed inside the barrel;
By operating the rotation selection member to select one of the plurality of cursive fonts and performing a knocking operation of pressing the operating portion forward, the selected cursive font can be put into a writing state or a non-writing state. is a dual writing instrument that can be switched,
A window is formed in the barrel, and the identification part corresponding to the selected cursive is visible through the window,
The identification section has a second identification section and a third identification section, and the second identification section and the third identification section are visible only in either a writing state or a non-writing state. A double writing instrument. a brake member movable in the longitudinal direction within the shaft cylinder by gravity; a cylindrical rotary member movable together with the operating portion and rotatable around a central axis; and a locking portion capable of locking with the rotary member. further comprising;
When the front end of the shaft cylinder is directed upward, the brake member moves rearward, the rotation of the rotating member is restricted, and the rotating member engages with the locking portion, thereby causing the operating portion to move forward. movement is prevented,
Any one of claims 1 to 4, wherein a protrusion is provided on the inner surface of the rotary member, and the brake member inserted into the rotary member engages with the protrusion, thereby regulating rotation of the rotary member. Double writing instruments as described in Section.

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