JP7088710B2 - Knock type writing tool - Google Patents

Description

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

Refilling by having an operation unit on the rear end of the cylinder or on the outer peripheral surface of the cylinder and performing a knock operation to push the operation unit forward against the urging force of the spring arranged in the cylinder. That is, a so-called knock-type writing instrument is known in which the writing state in which the writing portion, which is the pen tip of the cursive, protrudes from the tip of the barrel and the non-writing state in which the writing portion is immersed in the barrel can be switched. For example, Patent Document 1 discloses a knock-type writing tool in which an operation portion is provided at a rear end portion of a barrel.

Generally, knock-type writing tools have a rotor. A protruding cam portion is provided on the outer peripheral surface of the rotor, and a protruding cam portion that cooperates with the cam portion of the rotor is provided on the barrel side, for example, the inner peripheral surface of the inner cylinder. There is. By the knock operation, the cam portion of the rotor and the cam portion on the barrel side are locked or unlocked, so that the writing state and the non-writing state can be switched.

The knock operation is performed by pressing the operation unit forward and moving the rotor together with the operation unit forward to a predetermined position in the axle cylinder. That is, in order for the cam portion of the rotor and the cam portion on the axle cylinder side to be engaged, the rear end surface of the cam portion of the rotor is at least in front of the front end surface of the cam portion on the axle cylinder side in the axial direction. It is necessary to move the rotor to a predetermined position where it is placed. After moving the rotor to a predetermined position, when the force applied to the operation unit is released, the rotor rotates slightly and retracts slightly due to the urging force of the spring, and the rear end surface of the cam portion of the rotor and the axle tube. The front end surface of the cam portion on the side is engaged, and the knock-type writing tool is in the writing state.

In the writing state, when the operation unit is pressed forward by a knock operation and the rotor is moved forward again to a predetermined position, the rear end surface of the cam portion of the rotor and the front end surface of the cam portion on the axle cylinder side are contacted. The lock is released and the rotor rotates. After that, when the force applied to the operation unit is released, the rotor moves further backward due to the urging force of the spring, and the knock-type writing tool is put into the non-writing state again.

Japanese Unexamined Patent Publication No. 2016-107615

In the conventional knock-type writing instrument, not only when changing from the non-writing state to the writing state, but also when changing from the writing state to the non-writing state, it is necessary to perform a knock operation for pressing the operation unit forward. When changing from the non-writing state to the writing state, the knocking operation can be said to be an intuitive operation because the operating direction of the operation unit and the moving direction of the cursive are the same in that they are forward. On the other hand, when changing from the writing state to the non-writing state, the operation unit is moved forward even though the cursive is moved backward, so the knock operation at this time is not an intuitive operation. ..

Further, since the spring that urges the operation unit to the rear in the writing state is in the compressed state, the force required for the knock operation in the writing state is larger than the force required for the knock operation in the non-writing state. big. Therefore, it may be difficult for small children and old people to knock.

An object of the present invention is to provide a knock-type writing tool that can be knocked more intuitively and easily.

According to one aspect of the present invention, it is a knock-type writing instrument including a shaft cylinder and an operation unit provided so as to be movable back and forth with respect to the shaft cylinder, and moves back and forth integrally with the operation unit. The locking portion and the locked portion provided on the inner peripheral surface of the barrel are further provided, and by moving the operating portion forward in a non-writing state, the locking portion and the covered portion are provided. The feature is that the locking portion is locked to enter the writing state, and in the writing state, the locking portion is released and the writing state is entered by moving the operation portion backward without moving the operation portion forward. A knock-type writing instrument is provided. In the axial direction of the knock-type writing instrument, the writing part side is defined as the "front" side, and the side opposite to the writing part is defined as the "rear" side.

The operating portion may have a locking member that can rotate around an axis, and the locking portion may be provided on the locking member. Further, a cam member is further provided, the locking member has a cam surface, the cam member has a cam receiving surface that cooperates with the cam surface, and the operation unit is moved forward in a non-writing state. Then, the cam surface and the cam receiving surface may cooperate to rotate the locking member so that the locking portion and the locked portion are locked. When the operating portion is moved backward in the writing state, the locking portion abuts on the locked portion and the locking member is rotated in the direction in which the locking is released. A slope may be formed on the portion or the locked portion. The surface of the operating portion may be exposed to the outside so as to be flush with the outer peripheral surface of the barrel. An elastic member that urges the operation portion rearward may be further provided.

According to the aspect of the present invention, there is a common effect of providing a knock-type writing tool that can be knocked more intuitively and easily.

It is a perspective view of the knock type writing tool according to 1st Embodiment of this invention. It is a vertical sectional view of the knock type writing instrument of FIG. 1 in the non-writing state. It is a vertical sectional view of the writing state of the knock type writing instrument of FIG. It is an enlarged view of the rear part of the knock type writing tool of FIG. It is a perspective view of the knock button of the knock type writing tool of FIG. It is a perspective view of the sliding member of the knock type writing tool of FIG. It is a perspective view of the locking member of the knock type writing tool of FIG. It is a perspective view of the holding member of the knock type writing tool of FIG. It is a vertical sectional view of the rear axis of the knock type writing tool of FIG. It is a schematic diagram which shows the switching between the non-writing state and the writing state of the knock type writing instrument of FIG. It is a perspective view of the knock-type writing instrument according to the 2nd Embodiment of this invention. FIG. 12 is a vertical cross-sectional view of the rear part of the knock-type writing instrument of FIG. 12 in a non-writing state. It is a vertical sectional view of the rear part of the writing state of the knock type writing instrument of FIG. FIG. 12 is a partial cross-sectional perspective view of the rear part of the knock-type writing instrument of FIG. It is a perspective view of the knock button of the knock type writing tool of FIG. It is a perspective view of the locking member of the knock type writing tool of FIG. It is a perspective view of the holding member of the knock type writing tool of FIG. It is a vertical sectional view of the rear axis of the knock type writing tool of FIG. It is a perspective view of the inner cylinder of the knock type writing tool of FIG. It is a vertical sectional view of the inner cylinder of the knock type writing tool of FIG.

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

1 is a perspective view of the knock-type writing instrument 1 according to the first embodiment of the present invention, FIG. 2 is a vertical sectional view of the knock-type writing instrument 1 of FIG. 1 in a non-writing state, and FIG. 3 is FIG. It is a vertical sectional view of the writing state of the knock-type writing instrument 1 of FIG. 4, and FIG. 4 is an enlarged view of the rear part of the knock-type writing instrument 1 of FIG. In FIG. 4, the rear axle 3 is omitted. Further, in FIG. 4, the third locking protrusion 50 on the shaft cylinder 4 side, which will be described later, is virtually shown.

The knock-type writing tool 1 includes a cylinder 4 formed in a cylindrical shape and having a front shaft 2 and a rear shaft 3, and a refill 5 which is a writing body arranged in the shaft cylinder 4 and having a writing portion 5a at one end. It has a spring 6 which is an elastic member for urging the refill 5 rearward, and a tail plug 7 which is fitted to the rear end portion of the rear shaft 3. A through hole for projecting the writing portion 5a of the refill 5 is formed at the front end portion of the front shaft 2. The rear end portion of the front shaft 2 is screwed with the front end portion of the rear shaft 3. The front shaft 2 and the rear shaft 3, and further, in the embodiment described later, may be referred to as a shaft cylinder including the inner cylinder. In this specification, in the axial direction of the knock-type writing tool 1, the writing portion 5a side is defined as the "front" side, and the other end, the tail plug 7 side, is defined as the "rear" side.

The knock-type writing tool 1 further includes a knock button 10, a sliding member 20, a locking member 30, and a holding member 40. In the knock-type writing tool 1, the refill 5 moves in the front-rear direction in the barrel 4 by the knock operation of the knock button 10. The state in which the writing unit 5a is immersed in the cylinder 4 is referred to as a non-writing state (FIGS. 1 and 2), and the state in which the writing unit 5a protrudes from the cylinder 4 is referred to as a writing state (FIG. 3). FIG. 4A is a knock-type writing instrument 1 in a non-writing state, and FIG. 4B is a knock-type writing instrument 1 in a writing state.

FIG. 5 is a perspective view of the knock button 10 of the knock-type writing tool 1 of FIG. The knock button 10 is arranged on the knock-type writing tool 1 so that the lower side is the front side in FIG. The knock button 10 has an elongated plate-shaped button body 11. A raised portion 12 is formed on one surface of the button body 11, and a fitting portion 13 projecting vertically is formed on the other surface of the button body 11. The raised portion 12 is a portion that the user directly touches when knocking, and the fitting portion 13 is a portion that fits into the sliding member 20 as described later.

FIG. 6 is a perspective view of the sliding member 20 of the knock-type writing tool 1 of FIG. The sliding member 20 is arranged in the knock-type writing tool 1 so that the lower side is the front side in FIG. The sliding member 20 is a tubular member. Two bent grooves 22 having a bent shape are formed axially symmetrically on the front portion of the sliding member 20. The bending groove 22 extends rearward from the front end surface 21 of the sliding member 20, then bends, and extends in the circumferential direction. A fitting hole 23 into which the fitting portion 13 of the knock button 10 is fitted is formed on the outer peripheral surface of one of the sliding members 20 between the two bending grooves 22. Two substantially rectangular notches 24 are formed axisymmetrically at the rear portion of the sliding member 20. The cutout portion 24 is formed so as to accommodate a part of the tail plug 7 (FIG. 4).

FIG. 7 is a perspective view of the locking member 30 of the knock-type writing tool 1 of FIG. The locking member 30 is arranged on the knock-type writing tool 1 so that the lower side is the front side in FIG. 7. The locking member 30 is a tubular member. The locking member 30 has a large diameter portion 31 arranged on the front side and a small diameter portion 32 arranged on the rear side. A cam surface 33 is formed on the front end surface of the large diameter portion 31. The cam surface 33 has four peaks 33a and 33b valleys. Specifically, the mountain portion 33a and the mountain portion 33a so that the cam surface 33 has an inclined portion 33c inclined in the circumferential direction with respect to a plane perpendicular to the front-rear direction and a vertical wall portion 33d extending in the front-rear direction. The valley portion 33b is configured.

Two pairs of first locking protrusions 34 and second locking protrusions 35 are formed axially symmetrically on the outer peripheral surface of the large diameter portion 31 of the locking member 30 as locking portions. The first locking projection 34 has a rear surface 34a inclined in the circumferential direction with respect to a plane perpendicular to the front-rear direction, and a side surface 34b in the circumferential direction. The corresponding second locking projection 35 is located rearward on the extension of the side surface 34b of the first locking projection 34. The second locking projection 35 has a front surface 35a inclined in the circumferential direction with respect to a plane perpendicular to the front-rear direction. The rear surface 34a of the first locking protrusion 34 and the front surface 35a of the second locking protrusion 35 are inclined in the same direction and may have the same inclination with each other, or have different inclinations with each other. May be. Two engaging protrusions 36 are formed axially symmetrically on the outer peripheral surface of the small diameter portion 32 of the locking member 30.

FIG. 8 is a perspective view of the holding member 40 of the knock-type writing tool 1 of FIG. In FIG. 8, the holding member 40 is arranged on the knock-type writing tool 1 so that the lower side is on the front side. The holding member 40 is a tubular member. The holding member 40 has a holding portion main body 41 and an insertion portion 42 having a smaller diameter formed at the rear portion of the holding portion main body 41. The holding portion main body 41 of the holding member 40 receives and holds the rear end portion of the refill 5. Therefore, the holding member 40 moves back and forth integrally with the refill 5. Two slide grooves 43 extending in the axial direction are formed symmetrically on the outer peripheral surface of the rear portion of the holding portion main body 41.

A cam receiving surface 44 having a shape complementary to the cam surface 33 of the locking member 30 is formed on the outer peripheral surface of the insertion portion 42 of the holding member 40. Therefore, the holding member 40 is a cam member. The cam receiving surface 44 has four peaks 44a and valleys 44b, similarly to the cam surface 33 of the locking member 30. That is, the cam receiving surface 44 of the holding member 40 has a mountain portion 44c inclined in the circumferential direction with respect to a plane perpendicular to the front-rear direction and a vertical wall portion 44d extending along the front-rear direction. A portion 44a and a valley portion 44b are configured.

FIG. 9 is a vertical cross-sectional view of the rear shaft 3 of the knock-type writing tool 1 of FIG. The rear shaft 3 is arranged on the knock-type writing tool 1 so that the lower side is the front side in FIG. A vertical groove 3a extending in the axial direction is formed on the outer peripheral surface of the rear portion of the rear shaft 3 in order to operably expose the knock button 10 to the outside. Two slide protrusions 3b extending in the axial direction are formed symmetrically on the inner peripheral surface of the rear shaft 3. Two third locking projections 50 are formed axially symmetrically on the inner peripheral surface of the rear shaft 3 as locked portions. The third locking projection 50 has a front surface 50a and a rear surface 50b inclined in the circumferential direction with respect to a plane perpendicular to the front-rear direction. The front surface 50a of the third locking protrusion 50 is inclined in the same direction as the rear surface 34a of the first locking protrusion 34, and has the same inclination but different inclinations. May be good. The rear surface 50b of the third locking protrusion 50 is inclined in the same direction as the front surface 35a of the second locking protrusion 35, and has the same inclination but different inclinations. May be good.

Next, the arrangement of each member in the knock-type writing tool 1 will be described with reference to FIGS. 2 to 4 again.

The knock button 10 is integrally attached to the sliding member 20 by fitting the fitting portion 13 into the fitting hole 23 of the sliding member 20. The knock button 10 constitutes an operation unit provided so as to be movable back and forth with respect to the barrel 4. That is, the knock button 10 is exposed to the outside through the vertical groove 3a of the rear shaft 3 and can move in the front-rear direction along the vertical groove 3a. As shown in FIGS. 1 to 3, the surface of the knock button 10 is substantially included in the outer peripheral surface of the axle cylinder 4, that is, the rear shaft 3, and is flush with the outer peripheral surface. However, the knock button 10 may be made to protrude from the outer peripheral surface of the barrel 4.

The locking member 30 is arranged in front of the sliding member 20. The sliding member 20 to which the knock button 10 is attached is inserted into the small diameter portion 32 of the locking member 30. In this state, each of the engaging protrusions 36 of the locking member 30 is arranged in the bending groove 22 of the corresponding sliding member 20 at a position extending in the bending groove 22 in the circumferential direction. Therefore, the locking member 30 can rotate about the axis with respect to the sliding member 20 within the range of the bending groove 22. In other words, the operating unit has a locking member 30 that can rotate around the axis. The rotation of the locking member 30 is not transmitted to the sliding member 20 due to slippage between the rear end surface of the large diameter portion 31 and the front end surface 21 of the sliding member 20. The first locking protrusion 34 and the second locking protrusion 35, which are locking portions provided on the locking member 30, move back and forth integrally with the operating portion.

The holding member 40 is arranged in front of the locking member 30, and the insertion portion 42 of the holding member 40 is inserted into the front end of the locking member 30. In this state, as will be described later with reference to FIG. 10, the cam surface 33 of the locking member 30 and the cam receiving surface 44 of the holding member 40 cooperate with each other, and the first locking protrusion of the locking member 30 cooperates. The 34 and the second locking protrusion 35 and the third locking protrusion 50 of the rear shaft 3 cooperate with each other. In other words, the locking member 30 and the holding member 40 are arranged with respect to the barrel 4 so that these cams and protrusions cooperate with each other.

The front end of the spring 6 is supported by the rear end surface of the front shaft 2, and the rear end of the spring 6 is in contact with the front end surface of the holding member 40. As a result, the spring 6 always urges the holding member 40 holding the refill 5 backward. The locking member 30 is urged rearward via the holding member 40, and the sliding member 20, that is, the operating portion to which the knock button 10 is attached is urged rearward via the locking member 30. A slide protrusion 3b of the corresponding rear shaft 3 is arranged in each of the slide grooves 43 of the holding member 40. Therefore, the holding member 40 is restricted from rotating around the axis and can move only in the front-rear direction.

In the forward knock operation, the sliding member 20 is pressed via the knock button 10. Next, the front end surface 21 of the sliding member 20 and the rear end surface of the large diameter portion 31 of the locking member 30 come into contact with each other, and the locking member 30 is pressed by the sliding member 20. The holding member 40 is then pressed by the locking member 30. In the backward knock operation, the sliding member 20 is pressed via the knock button 10. Next, the locking member 30 is pressed by engaging the edge portion 25 of the bending groove 22 of the sliding member 20 with the engaging protrusion 36 of the locking member 30.

The knocking operation of the knock-type writing tool 1 will be described with reference to FIG. FIG. 10 is a schematic diagram showing switching between the non-writing state and the writing state of the knock-type writing instrument 1 of FIG. 1. That is, FIG. 10 shows the cam surface 33 of the locking member 30, the first locking protrusion 34 and the second locking protrusion 35, the cam receiving surface 44 of the holding member 40, and the third locking of the axle cylinder 4. In order to show the positional relationship with the protrusion 50, the position of each member is shown with respect to the one in which the cylindrical surface around the central axis including the two third locking protrusions 50 is developed in the circumferential direction. In FIG. 10, the lower side is the front side. Further, in FIG. 10, the direction from (A) to (D) (direction from left to right in the figure) indicates switching from the non-writing state to the writing state, and goes from (D) to (A). The direction (direction from right to left in the figure) indicates switching from the written state to the non-written state.

First, switching from the non-written state to the written state will be described. In the non-writing state of FIG. 10A (see also FIG. 4A), the cam surface 33 of the locking member 30 and the cam receiving surface 44 of the holding member 40 are arranged out of phase with each other. The inclined portion 33c and the inclined portion 44c of the cam receiving surface 44 are in contact with each other. Therefore, the locking member 30 receives a component force in the circumferential direction so that the cam surface 33 and the cam receiving surface 44 coincide with each other due to the urging force of the spring 6. At this time, the locking member 30 is restricted from rotating by locking the first locking protrusion 34, specifically, the side surface 34b to the third locking protrusion 50 of the barrel 4. Has been done.

Next, a knock operation is performed in which the operation unit, that is, the knock button 10 is pressed forward against the urging force of the spring 6. As a result, the locking member 30 moves forward together with the holding member 40 in the barrel 4 while the rotation of the locking member 30 is restricted by the locking of the first locking protrusion 34 with the third locking protrusion 50. (FIG. 10 (B)).

When the knock button 10 is pressed further forward, the locking member 30 moves further forward, the first locking protrusion 34 exceeds the third locking protrusion 50 in the axial direction, and the locking member 30 rotates. The regulation is lifted (Fig. 10 (C)). At this time, the front surface 35a of the second locking protrusion 35 of the locking member 30 may be brought into contact with the rear surface 50b of the third locking protrusion 50 of the barrel 4.

When the restriction on the rotation of the locking member 30 is lifted, the locking member 30 is subjected to the circumferential direction ( Rotate to the right in the figure). This rotation may be assisted by a circumferential component force due to contact between the front surface 35a of the second locking protrusion 35 and the rear surface 50b of the third locking protrusion 50. The rotation of the locking member 30 is caused by the coincidence of the cam surface 33 and the cam receiving surface 44, that is, by locking the vertical wall portion 33d of the cam surface 33 and the vertical wall portion 44d of the cam receiving surface 44. Stop (see also FIG. 10 (D)) (see also FIG. 4 (B)).

In the state of FIG. 10D, when the forward pressing on the knock button 10 is released, the holding member 40 and thus the locking member 30 are urged backward by the spring 6. The rearward movement of the locking member 30 and the holding member 40 is restricted by locking the rear surface 34a of the first locking protrusion 34 to the front surface 50a of the third locking protrusion 50. At this time, since the holding member 40 is sufficiently advanced and the writing portion 5a of the refill 5 protrudes from the tip of the barrel 4, the knock-type writing tool 1 is in the writing state. Further, even if the pressure on the knock button 10 is released, the locking member 30 and the holding member 40 hardly move backward.

The rear surface 34a of the first locking protrusion 34 is pressed against the front surface 50a of the third locking protrusion 50 by the urging force of the spring 6, and is in the opposite circumferential direction (left direction in the figure). Receive a component. Therefore, in the state of FIG. 10D, due to the urging force of the spring 6, the component force between the rear surface 34a of the first locking protrusion 34 and the front surface 50a of the third locking protrusion 50 and the cam surface 33 And two components in opposite directions, the component force between the cam receiving surfaces 44, acts on the locking member 30. However, since the component forces in these two circumferential directions and the frictional force received from the abutting surface between the members are balanced, the locking member 30 does not rotate. In other words, the urging force of the spring 6, the angle of the slope, the frictional force, and the like are adjusted so that the locking member 30 does not rotate in the state of FIG. 10D in which the pressing force due to the knock operation does not act.

Next, switching from the written state to the non-written state will be described. In the writing state of FIG. 10D, a knock operation is performed by pressing the operation unit, that is, the knock button 10 backward. As a result, the rear surface 34a of the first locking protrusion 34 is pressed against the front surface 50a of the third locking protrusion 50. Since the rear surface 34a and the front surface 50a are inclined surfaces, the locking member 30 receives a component force in the circumferential direction and rotates in the circumferential direction (leftward in the figure) due to the pressing force of the knock operation. Further, since the backward pressing force due to the knock operation does not act on the holding member 40, the cam surface 33 of the locking member 30 and the cam receiving surface 44 of the holding member 40 are arranged out of phase again. To. The locking member 30 rotates in the circumferential direction until the rear surface 34a of the first locking protrusion 34 exceeds the front surface 50a of the third locking protrusion 50 (FIG. 10 (C)).

By further pushing the knock button 10 backward, the locking member 30 moves further backward (FIG. 10 (B)), and the knock-type writing tool 1 is put into the non-writing state again (FIG. 10 (A)). In switching from the writing state to the non-writing state, the user may only perform a knock operation in which a pressing force is applied to shift from the state shown in FIG. 10 (D) to the state shown in FIG. 10 (C). Even if the pressing force is subsequently released, the transition from FIG. 10 (C) to the state of FIG. 10 (A) is performed by the urging force of the spring 6.

When the writing pressure at the time of writing is applied to the holding member 40, the locking member 30 receives a component force in the circumferential direction so that the cam surface 33 and the cam receiving surface 44 coincide with each other. Therefore, in the locking member 30, the locking member 30 rotates despite the circumferential component force due to the contact between the rear surface 34a of the first locking protrusion 34 and the front surface 50a of the third locking protrusion 50. There is nothing to do.

11 is a perspective view of the knock-type writing instrument 100 according to the second embodiment of the present invention, FIG. 12 is a vertical sectional view of the rear portion of the knock-type writing instrument 100 of FIG. 12 in a non-writing state, and FIG. 12 is a vertical cross-sectional view of the rear part of the knock-type writing instrument 100 in FIG. 12, and FIG. 14 is a partial cross-sectional perspective view of the rear part of the knock-type writing instrument 100 of FIG.

The knock-type writing tool 100 is a cursive that is formed in a cylindrical shape and has a front shaft 102, a rear shaft 103, and an inner cylinder 160, and a cursive that is arranged in the shaft cylinder 104 and has a writing portion at one end. It has a refill 105, a spring 106 which is an elastic member for urging the refill 105 rearward, and a tail plug 107 fitted to the rear end portion of the rear shaft 103. A through hole for projecting the writing portion of the refill 105 is formed at the front end portion of the front shaft 102. The rear end portion of the front shaft 102 is screwed with the front end portion of the rear shaft 103.

The knock-type writing tool 100 further includes a knock button 110, a locking member 130, and a holding member 140. In the knock-type writing tool 100, the refill 105 moves in the front-rear direction in the barrel 104 by the knock operation of the knock button 110. The knock-type writing tool 100 of the present embodiment is a knock-type writing tool 100 of the first embodiment in that the knock button 10 and the sliding member 20 are integrally formed as the knock button 110 and have an inner cylinder 160. It is very different from writing tool 1.

FIG. 15 is a perspective view of the knock button 110 of the knock-type writing tool 100 of FIG. The knock button 110 is arranged on the knock-type writing tool 100 so that the lower side faces the front side in FIG. 15. The knock button 110 has an elongated plate-shaped button body 111. A raised portion 112 is formed on a part of one surface of the button body 111. The raised portion 112 is a portion that the user directly touches during the knock operation. Two vertically projecting legs 113 are formed on the other surface of the button body 111. The tips of the two legs 113 are integrally attached to the outer peripheral surface of the tubular sliding portion 114. A guide protrusion 115 is formed on the outer peripheral surface of the sliding portion 114 on the side opposite to the leg portion 113. Two window holes 116 having a fan-shaped cross section having a predetermined central angle α are formed axially symmetrically on the outer peripheral surface of the sliding portion 114.

FIG. 16 is a perspective view of the locking member 130 of the knock-type writing tool 100 of FIG. The locking member 130 is arranged on the knock-type writing tool 100 so that the lower side is the front side in FIG. The locking member 130 is a tubular member. The locking member 130 has a large diameter portion 131 arranged on the front side and a small diameter portion 132 arranged on the rear side. A cam surface 33 is formed on the front end surface of the large diameter portion 131. The cam surface 33 is the same as the cam surface 33 of the knock-type writing tool 1 of the first embodiment described above.

Two pairs of first locking protrusions 34 and second locking protrusions 35 are formed axially symmetrically on the outer peripheral surface of the large diameter portion 131 of the locking member 130 as locking portions. The first locking protrusion 34 and the second locking protrusion 35 are the same as the first locking protrusion 34 and the second locking protrusion 35 of the knock-type writing tool 1 of the first embodiment described above. Two engaging protrusions 136 are formed axisymmetrically on the outer peripheral surface of the small diameter portion 132 of the locking member 130. Two rectangular through holes 137 extending in the axial direction are formed axially symmetrically between the two engaging protrusions 136.

FIG. 17 is a perspective view of the holding member 140 of the knock-type writing tool 100 of FIG. In FIG. 17, the holding member 140 is arranged on the knock-type writing tool 100 so that the lower side is on the front side. The holding member 140 is a tubular member. The holding member 140 has a holding portion main body 141 and an insertion portion 142 having a smaller diameter formed at the rear portion of the holding portion main body 141. The holding portion main body 141 of the holding member 140 receives and holds the rear end portion of the refill 105. Therefore, the holding member 140 moves back and forth integrally with the refill 105. Two slide protrusions 143 are formed axisymmetrically on the outer peripheral surface of the rear portion of the holding portion main body 141.

A cam receiving surface 44 having a shape complementary to the cam surface 33 of the locking member 130 is formed on the outer peripheral surface of the insertion portion 142 of the holding member 140. Therefore, the holding member 140 is a cam member. The cam receiving surface 44 is the same as the cam receiving surface 44 of the knock-type writing tool 1 of the first embodiment described above. The front portion of the holding portion main body 141 is formed to have a smaller diameter, whereby a support surface 145 facing forward is formed.

FIG. 18 is a vertical cross-sectional view of the rear shaft 103 of the knock-type writing tool 100 of FIG. The rear shaft 103 is arranged on the knock-type writing tool 100 so that the lower side is the front side in FIG. A vertical groove 103a for operably exposing the knock button 110 to the outside is formed on the outer peripheral surface of the rear portion of the rear shaft 103. On the inner peripheral surface of the rear shaft 103, six protrusions extending in the axial direction from the front end toward the rear are provided at equal intervals along the circumferential direction. Two of the six protrusions are long protrusions 103b, which are thinner and longer protrusions, and are arranged axisymmetrically. The remaining four of the six protrusions are two pairs of short protrusions 103c, which are thicker and shorter protrusions, and are arranged axisymmetrically between the two long protrusions 103b. Each of the long protrusion 103b and the short protrusion 103c is formed with a stepped portion 103d facing rearward at the same position in the axial direction.

19 is a perspective view of the inner cylinder 160 of the knock-type writing tool 100 of FIG. 12, and FIG. 20 is a vertical sectional view of the inner cylinder 160 of the knock-type writing tool 100 of FIG. The inner cylinder 160 is arranged on the knock-type writing tool 100 so that the lower side faces the front side in FIGS. 19 and 20. A vertical groove 161 extending in the axial direction is formed on the outer peripheral surface of the rear portion of the inner cylinder 160 in order to operably expose the knock button 110 to the outside. A guide groove 162 extending in the axial direction is formed on the outer peripheral surface of the inner cylinder 160 on the side opposite to the vertical groove 161. Two rectangular slide grooves 163 extending in the axial direction are formed symmetrically on the outer peripheral surface of the inner cylinder 160 in front of each of the vertical groove 161 and the guide groove 162. Two pairs of notches 164 are formed on the front end surface of the inner cylinder 160. Two rectangular planes 165 extending in the axial direction are formed symmetrically on the outer peripheral surface of the inner cylinder 160. Two third locking projections 50 are formed axially symmetrically on the inner peripheral surface of the inner cylinder 160 as locked portions. The third locking protrusion 50 is the same as the third locking protrusion 50 of the knock-type writing tool 1 of the first embodiment described above.

Next, the arrangement of each member in the knock-type writing tool 100 will be described with reference to FIGS. 11 to 14 again.

The inner cylinder 160 is inserted into the rear shaft 103 from the rear and attached to the rear shaft 103. That is, the two pairs of short protrusions 103c of the rear shaft 103 are inserted into the corresponding two pairs of notches 164 of the inner cylinder 160, and the movement of the inner cylinder 160 in the axial direction is fixed. Further, the rectangular plane 165 of the inner cylinder 160 is sandwiched between the long protrusions 103b of the rear shaft 103, and the radial movement of the inner cylinder 160 is fixed.

The knock button 110 constitutes an operation unit provided so as to be movable back and forth with respect to the shaft cylinder 104. The knock button 110 is exposed to the outside through the vertical groove 103a of the rear shaft 103 and the vertical groove 161 of the inner cylinder 160. Further, the guide protrusion 115 of the knock button 110 is arranged in the guide groove 162 of the inner cylinder 160. Therefore, the knock button 110 can move in the front-rear direction along the vertical groove 103a, the vertical groove 161 and the guide groove 162. The knock button 110 slightly protrudes from the outer peripheral surface of the axle cylinder 104, that is, the rear axle 103. However, the surface of the knock button 110 may be substantially included in the outer peripheral surface of the barrel 104 and may be flush with the outer surface.

The locking member 130 is arranged in front of the knock button 110 and is attached to the sliding portion 114. That is, the small diameter portion 132 of the locking member 130 is inserted into the cylindrical sliding portion 114 of the knock button 110. At the time of insertion, the through hole 137 is formed in the small diameter portion 132, so that the small diameter portion 132 is easily bent in the radial direction, and each of the engaging protrusions 136 is the window hole 116 of the corresponding sliding portion 114. (Fig. 12). Therefore, the locking member 130 can rotate about the axis with respect to the sliding portion 114 of the knock button 110. In other words, the operating unit has a locking member 130 that is rotatable about an axis. The range in which the locking member 130 can rotate is the range of the central angle α of the window hole 116. The rotation of the locking member 130 is not transmitted to the knock button 110 due to slippage between the rear end surface of the large diameter portion 131 and the front end surface 117 of the sliding portion 114. The first locking protrusion 34 and the second locking protrusion 35, which are locking portions provided on the locking member 130, move back and forth integrally with the operating portion.

The holding member 140 is arranged in front of the locking member 130, and the insertion portion 142 of the holding member 140 is inserted into the front end of the locking member 130. In this state, as described above with reference to FIG. 10, the cam surface 33 of the locking member 130 and the cam receiving surface 44 of the holding member 140 cooperate with each other, and the first locking protrusion of the locking member 130 cooperates. The 34 and the second locking protrusion 35 and the third locking protrusion 50 of the inner cylinder 160 cooperate with each other. In other words, the locking member 130 and the holding member 140 are arranged with respect to the barrel 104 so that these cams and protrusions cooperate with each other.

The front end of the spring 106 is supported by the stepped portion 103d of the front shaft 102, and the rear end thereof is in contact with the support surface 145 of the holding member 140. As a result, the spring 106 always urges the holding member 140 holding the refill 105 backward. The locking member 130 is urged rearward via the holding member 140, and the knock button 110, that is, the operating portion is urged rearward via the locking member 130. Each of the slide protrusions 143 of the holding member 140 is arranged in the slide groove 163 of the corresponding inner cylinder 160. Therefore, the holding member 140 is restricted from rotating around the axis and can move only in the front-rear direction.

In the forward knock operation, the front end surface 117 of the knock button 110 and the rear end surface of the large diameter portion 131 of the locking member 130 come into contact with each other, and the locking member 130 is pressed by the knock button 110. The holding member 140 is then pressed by the locking member 130. In the rearward knock operation, the window hole 116 of the knock button 110, that is, the locking surface 118 (FIG. 12) on the front side and the engaging protrusion 136 of the locking member 130 engage with each other to engage the locking member 130. Is pressed.

Since the knocking operation of the knock-type writing tool 100 is the same as the knocking operation described with reference to FIG. 10, the description thereof will be omitted.

According to the knock-type writing instrument according to the embodiment of the present invention, in the non-writing state, by moving the operating portion forward, the locked portion and the locked portion are locked to be in the writing state, and in the writing state, the locked portion is in the writing state. By moving the operation unit backward without moving it forward, the locking is released and the writing state is entered. When the operating portion is moved forward in the non-writing state, the cam surface and the cam receiving surface cooperate to rotate the locking member, and the locking portion and the locked portion are locked. In the writing state, when the operation unit is moved backward, the locking portion abuts on the locked portion and the locking portion or the locked portion is rotated so as to rotate the locking member in the direction in which the locking is released. A slope is formed on.

As long as such an operation is possible, the locking portion may have a shape other than the shapes of the first locking protrusion 34 and the second locking protrusion 35 shown in the above-described embodiment. Further, the locked portion may have a shape other than the shape of the third locking protrusion 50 shown in the above-described embodiment. For example, the first locking protrusion 34 and the second locking protrusion 35 may be integrally formed as one locking protrusion, and the first locking protrusion 34 may be formed on the rear surface 34a and the side surface 34b. It may be divided into two locking protrusions, each having a corresponding surface. Further, the cam surface and the cam receiving surface may have a shape other than the shapes of the cam surface 33 and the cam receiving surface 44 shown in the above-described embodiment. The second locking protrusion 35 may be omitted.

According to the knock-type writing tool according to the embodiment of the present invention, since the operation direction of the operation unit and the movement direction of the refill are always the same, the user can intuitively perform the knock operation. Further, the operation amount of the operation unit, that is, the movement amount of the operation unit can be minimized, that is, the distance between the refill position in the written state and the refill position in the non-writing state. Thereby, the knock operation can be performed more easily. In addition, the total length of the refill can be increased so that the ink can be stored more.

The force required for the knock operation in the writing state is assisted by the urging force of the spring rather than resisting the urging force of the spring as in the conventional knock-type writing instrument, so it is necessary for the knock operation in the non-writing state. It can be made smaller than the force. Therefore, even a small child or an elderly person can easily perform a knock operation. In addition, the spring constant of the spring that urges the operation unit to the rear can be made smaller than that of the conventional knock-type writing tool. By minimizing the amount of operation of the operation unit, by reducing the spring constant of the spring, or by moving the user's finger backward together with the operation unit, the writing state is changed to the non-writing state. At the time of switching, the collision noise and impact caused by the repulsion of the spring can be reduced.

Since the pressing force required by the series of knock operations is smaller than that of the conventional knock-type writing tool, the amount of protrusion of the operation portion from the outer peripheral surface of the barrel can be reduced. That is, in the conventional knock-type writing tool, it is necessary to increase the amount of protrusion of the operation portion from the outer peripheral surface of the barrel so that the finger can be easily caught during the knock operation in the writing state where a particularly large force is required. rice field. However, according to the knock-type writing tool according to the embodiment of the present invention, since the knock operation can be performed with a smaller force, the protrusion amount can be reduced, and further, the protrusion amount can be reduced to zero so as to be flush with the outer peripheral surface of the barrel. Can be. When the surface of the operation portion is flush with the outer peripheral surface of the barrel, a locking groove may be formed on the surface of the operation portion in order to increase the frictional force with the finger. Since the amount of protrusion of the operation unit and the size of the operation unit itself can be reduced, and the vertical groove of the cylinder required for the operation unit can be shortened, the area of the cylinder surface required for the knock operation mechanism can be minimized. The knock-type writing tool as a whole can be made to have a higher design. Also, the clip can be placed at any position.

In the knock-type writing tool 100 according to the second embodiment, the knock mechanism portion can be unitized. That is, the knock mechanism can be configured as a unit including a knock button, a locking member, a holding member, and an inner cylinder. As a result, it can be replaced or repaired, applied to existing writing tools, sold as a single unit, and the like.

The refill described above may be a refill for a ballpoint pen, or may be another type of refill such as a mechanical pencil, a marking pen, a touch pen, an eraser, or a friction body. Further, the tail plug may be used as an erasing member for erasing the handwriting by refilling by adhering or performing two-color molding or the like on the entire tail plug or a part of the tail plug. Further, other parts of the knock-type writing tool, for example, the front end of the front shaft or the clip may be used as the erasing member.

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

The thermochromic microcapsule pigment used as a thermochromic coloring material is a pigment that changes color due to heat such as frictional heat, for example, if it has a function of changing from colored to colorless, colored to colored, colorless to colored, and the like. The present invention is not particularly limited, and various substances can be used, and examples thereof include microencapsulated heat-discoloring compositions containing at least a leuco dye, a color-developing agent, and a discoloration temperature-adjusting agent.

The leuco dye that can be used is not particularly limited as long as it is an electron donating dye and functions as a color former. Specifically, conventionally known inks such as triphenylmethane type, spiropyran type, fluorane type, diphenylmethane type, rhodamine lactam type, indrill phthalide type, and leucooramine type are used from the viewpoint of obtaining an ink having excellent color development characteristics. It can be used alone (1 type) or in combination of 2 or more (hereinafter, simply referred to as "at least 1 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-methylindole-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-Methyl-7-Methyl-7-Xylidinofluolane, 2- (2-Chloroanilino) -6- Dibutylaminofluorane, 3,6-dimethoxyfluorine, 3,6-di-n-butoxyfluorane, 1,2-benz-6-diethylaminofluorane, 1,2-benz-6-dibutylaminofluorane, 1,2-Benz-6-ethylisoamylaminofluorane, 2-methyl-6- (N-p-tolyl-N-ethylamino) fluorane, 2- (N-phenyl-N-methylamino) -6- (Np-tolyl-N-ethylamino) fluorane, 2- (3'-trifluoromethylanilino) -6-diethylaminofluorane, 3-chloro-6-cyclohexylaminofluorane, 2-methyl-6- Cyclohexylaminofluorane, 3-di (n-butyl) amino-6-methoxy-7-anilinofluorane, 3,6-bis (diphenylamino) fluorane, methyl-3', 6'-bisdiphenylaminofluorane , Chloro-3', 6'-bisdiphenylaminofluorane, 3-methoxy-4-dodecoxystylinoquinolin, and the like.

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

The color developer that can be used is a component having an ability to develop the color of the leuco dye, and is, for example, a phenol resin compound, a salicylic acid metal chloride, a salicylic acid resin metal salt compound, a solid acid compound, or the like. Can be mentioned.

Specifically, o-cresol, tertiary butylcatechol, nonylphenol, n-octylphenol, n-dodecylphenol, n-stearylphenol, p-chlorophenol, p-bromophenol, o-phenylphenol, hexafluorobisphenol, p. -Hydroxybenzoate n-butyl, p-hydroxybenzoate n-octyl, resorcin, dodecyl gallate, 2,2-bis (4'-hydroxyphenyl) propane, 4,4-dihydroxydiphenylsulfone, 1,1-bis (4'-Hydroxyphenyl) ethane, 2,2-bis (4'-hydroxy-3-methylphenyl) propane, bis (4-hydroxyphenyl) sulfide, 1-phenyl-1,1-bis (4'-hydroxy) Phenyl) ethane, 1,1-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 -Nonan, 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) ethyl propionate, 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 developer to be used may be arbitrarily selected according to the desired color density, and is not particularly limited, but is usually 0.1 to 1 part by mass with respect to 1 part by mass of the above-mentioned leuco dye. It is preferable to select within the range of about 100 parts by mass.

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

More specifically, bis (4-hydroxyphenyl) phenylmethane dicaprylate (C ₇ H ₁₅ ), bis (4-hydroxyphenyl) phenylmethane dilaurate (C ₁₁ H ₂₃ ), bis (4-hydroxyphenyl) phenyl. Methanedimilistate (C ₁₃ H ₂₇ ), bis (4-hydroxyphenyl) phenylethane dimiristate (C ₁₃ H ₂₇ ), bis (4-hydroxyphenyl) phenylmethane dipalmitate (C ₁₅ H ₃₀ ), bis At least one such as (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 adjusting agent used may be appropriately selected depending on the desired hysteresis width, the color density at the time of color development, and the like, and is not particularly limited, but is usually, with respect to 1 part by mass of the leuco dye. It is preferably used within the range of about 1 to 100 parts by mass.

The thermochromic microcapsule pigment is obtained by microencapsulating a thermochromic composition containing at least the leuco dye, a color developer, and a color change temperature adjusting agent so that the average particle size is 0.2 to 5 μm. Can be manufactured. Examples of the microencapsulation method include an interfacial polymerization method, an interfacial polycondensation method, an insitu polymerization method, an in-liquid curing coating method, a phase separation method from an aqueous solution, a phase separation method from an organic solvent, a melting dispersion cooling method, and an air vapor. Examples thereof include a suspension coating method and a spray drying method, which can be appropriately selected depending on the intended use.

For example, in the phase separation method from an aqueous solution, a leuco dye, a color developer, and a discoloration temperature adjuster are heated and melted, then put into an emulsifier solution, heated and stirred to disperse them in the form of oil droplets, and then used as a capsule film agent. Using a resin raw material, for example, an amino resin solution, an isocyanate-based resin solution, etc. are gradually added, and the reaction is continued to prepare the mixture, and then the dispersion is filtered to produce the desired thermochromic microcapsule pigment. be able to.

The contents of these leuco dyes, color developeres, and color change temperature adjusters vary depending on the leuco dye, color developer, type of color change temperature adjuster, microencapsulation method, etc. used. The color-developing agent is 0.1 to 100 and the discoloration temperature adjusting agent is 1 to 100 in terms of mass ratio. The mass ratio of the capsule membrane agent to the capsule contents is 0.1 to 1.

The thermochromic microcapsule pigment can be obtained by appropriately combining the types and amounts of the leuco dye, the color developer, and the color change temperature adjusting agent to obtain the color development temperature (for example, color development at 0 ° C. or higher) and the decolorization temperature (for example, 0 ° C. or higher) of each color. For example, (decoloring at 50 ° C. or higher) can be set to 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 the drawing density, storage stability, and writability. Examples of the urethane resin include a compound of isocyanate and a polyol. Examples of the epoxy resin include a compound of an epoxy resin and an amine. Examples of the amino resin include melamine resin, urea resin, benzoguanamine resin and the like. The thickness of the wall film of the microcapsule coloring material is appropriately determined according to the required strength of the wall film and the drawing density.

The average particle size of the heat-discolorable microcapsule pigment is colorability, color-developing property, easy-decoloring property, stability, fluidity in ink, and suppresses adverse effects on writability. From the viewpoint of compatibility with the microcapsule pigment, the thickness is preferably 0.2 to 5 μm, more preferably 0.3 to 3 μm. The "average particle size" specified here is a value obtained by measuring the average particle size (50% diameter) (refractive index 1.8) with a particle size analyzer [Microtrack HRA9320-X100 (manufactured by Nikkiso Co., Ltd.)]. 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 property is deteriorated, the dispersion stability of the heat-discolorable microcapsule pigment is lowered, and the ink due to vibration is generated. It is not preferable because backing is likely to occur. Further, the 90% diameter is 8 μm or less, preferably 6 μm or less. When particles having a large diameter are present in a certain proportion or more, the above-mentioned influence tends to become more remarkable. The microcapsule pigment in the above-mentioned average particle size range (0.2 to 5 μm) varies depending on the microencapsulation method, but in the phase separation method from an aqueous solution or the like, stirring is performed when producing the microcapsule pigment. It can be prepared by appropriately combining the conditions.

The specific gravity of the heat-discolorable microcapsule pigment is in the range of 0.9 to 1.3, preferably 1.0 to 1.2. When the specific gravity is out of this range, the dispersion stability of the microcapsule pigment tends to decrease. Further, microcapsule pigments having a specific gravity of more than 1.3 are liable to cause ink back due to vibration.

In the water-based ink composition for writing tools, in addition to the above-mentioned heat-discoloring microcapsule pigment, water (tap water, purified water, distilled water, ion-exchanged water, pure water, etc.) as a solvent as a balance, and for each writing tool (ballpoint pen). Depending on the application (for marking pens, etc.), a water-soluble organic solvent, thickener, lubricant, rust preventive, preservative or antibacterial agent, etc. may be appropriately contained within the range that does not impair the effect. can.

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

Of these, glycerin is preferably used for the purpose of suppressing ink solidification in the writing portion due to ink back, and the amount of glycerin added is preferably 1 to 10% by mass with respect to the total amount of ink. The mechanism of action by glycerin is unknown, but it is presumed to have the effect of reducing the cohesive force of pigments 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, Arabic gum, tragacant gum, guar gum, locust bean gum, arginic acid, carrageenan, gelatin, xanthan gum, welan gum, succinoglycan, dieutan gum, dextran, methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose, starch glycolic acid and The salt, arginate propylene glycol ester, polyvinyl alcohol, polyvinylpyrrolidone, polyvinylmethyl ether, polyacrylic acid and its salts, carboxyvinyl polymer, polyethyresioxide, vinyl acetate and polyvinylpyrrolidone copolymer, crosslinked acrylic acid polymer and Examples thereof include the salt thereof, the non-bridged acrylic acid polymer and its salt, the styrene acrylic acid copolymer and its salt, and the like.

Of these, it is preferable to use polysaccharides. Due to its rheological properties, polysaccharides tend to be less susceptible to the effects of vibration on fluidity, and are less likely to cause problems such as writing defects due to ink back. In particular, xanthan gum is preferable because it has an excellent balance with other characteristics required for writing tool ink.

As the lubricant, fatty acid ester of polyhydric alcohol, which is also used as a surface treatment agent for pigments, higher fatty acid ester of sugar, polyoxyalkylene higher fatty acid ester, alkyl phosphate ester, alkyl sulfonate of higher fatty acid amide, alkyl allyl sulfone. Examples thereof include acid salts, derivatives of polyalkylene glycols, fluorosurfactants, and polyether-modified silicones. Examples of the rust preventive include benzotriazole, tolyltriazole, dicyclohexylammonium nitrate, and saponins. Examples of the preservative or antibacterial agent include phenol, sodium omadin, sodium benzoate, benzimidazole compounds and the like.

In order to produce this water-based ink composition for writing tools, a conventionally known method can be adopted. For example, in addition to the above-mentioned heat-discoloring and photo-discoloring microcapsule pigments, a predetermined amount of each component in the above-mentioned water-based is used. It is obtained by blending and stirring and mixing with 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 water-based ink composition for writing tools is preferably 500 to 2000 mPa · s at a shear rate of 3.83 / s and 20 to 100 mPa · s at a shear rate of 383 / s. By setting the viscosity in the above range, it is possible to obtain an ink having excellent writability and stability over time. Further, S = αD ⁿ (where 1>n> 0) (S is shear stress (dyn / cm ² ), D is shear rate (s ^-1 ), α is non-Newtonian viscosity coefficient). The required non-Newtonian viscosity index n is preferably 0.2 to 0.6. By setting the non-Newtonian viscosity index n in the above range in addition to the above viscosity range, it is possible to appropriately set the fluidity of the ink with respect to vibration, and it is possible to prevent the occurrence of ink back.

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

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

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

Specific examples of the polybutene that can be used include commercially available Nissan polybutene 200N, polybutene 30N, polybutene 10N, polybutene 5N, polybutene 3N, polybutene 015N, polybutene 06N, polybutene 0N (all manufactured by Nippon Oil & Fat Co., Ltd.), and polybutene. Examples include HV-15 (manufactured by Nippon Petrochemical Co., Ltd.) and 35R (manufactured by Idemitsu Kosan Co., Ltd.).

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

Specific ethylene α-olefin oligomers that can be used include, for example, commercially available Lucant HC-10, HC-20, HC-100, HC-150, (HC-600, HC-2000) (above, Mitsui). (Made by Chemicals), etc.

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

Examples of the thickener used for the ink follower include calcium salt of phosphate ester, fine particle silica, polystyrene-polyethylene / butylene rubber-polystyrene block copolymer, polystyrene-polyethylene / propylene rubber-polystyrene block copolymer, and hydrogenated styrene. -Butadiene rubber, block copolymer of styrene-ethylenebutylene-olefin crystal, block copolymer of olefin crystal-ethylenebutylene-olefin crystal, acetalkoxyaluminum dialchelate and the like can be mentioned, and these can be used alone or in combination of two or more.

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

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

Preferred commercially available hydrogenated styrene-butadiene rubbers include DYNARON1320P, DYNARON1321P (above, manufactured by JSR), Toughtech Hl041, Toughtech Hl141 (above, manufactured by Asahi Kasei Kogyo Co., Ltd.) and the like.

Preferred commercial products of the block copolymer of styrene-ethylenebutylene-olefin crystal include DYNARON4600P (manufactured by JSR), and preferred commercial products of the block copolymer of olefin crystal-ethylenebutylene-olefin crystal include DYNARON6200P and DYNARON6201B (manufactured by JSR). JSR Corporation) and the like.

Preferred commercially available products of acetalkoxyaluminum dialchelates include Plenact AL-M (manufactured by Ajinomoto Fine-Techno Co., Ltd.) and the like.

Among these thickeners, thermoplastic olefin-based elastomers such as styrene-ethylenebutylene-olefin crystal block copolymers and olefin crystals-ethylenebutylene-olefin crystal block copolymers are used from the viewpoint of further exerting the effects of the present invention. Preferable to use.

Further, from the viewpoint of obtaining an ink follower that prevents the occurrence of ink back, the average value of the tan δ values measured for each frequency while increasing exponentially in the frequency domain 1 to 63 rad / s shall be 1.0 or more. Is preferable, and 1.7 to 3.4 is more preferable.

Here, tan δ is a value meaning a loss elastic modulus / storage elastic modulus, and conventionally, it is an average value of tan δ values measured for each frequency while increasing exponentially in the frequency domain “1 to 63 rad / s”. It has been known that a value of 1.0 or less is preferable. 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 1.0 or more, it is possible to absorb vibration and prevent the occurrence of ink back.

Materials that form the friction material include thermosetting rubbers such as silicone rubber, nitrile rubber, ethylene propylene rubber, and ethylene propylene diene rubber, and thermoplastic elastomers such as styrene elastomers, olefin elastomers, polyester elastomers, and urethane elastomers. A mixture of two or more kinds of rubber elastic materials and a mixture of rubber elastic materials and synthetic resin can be used, and this is loaded by a wear test (ASTM D1044) specified in JIS K7204. In an environment of 8N and 1000 rpm, the amount of Taber wear on the wear wheel CS-17 of the Taber wear tester is configured to be less than 25 mg, and a friction body is formed.

Further, an alkyl sulphonic acid phenyl ester or a cyclohexanedicarboxylic acid ester may be added to the material of the friction body. Since the friction body contains an alkylsulphonic acid phenyl ester and a cyclohexanedicarboxylic acid ester, it is possible to erase the handwriting without damaging the paper surface and blurring the printed characters and the like. Further, the friction body preferably has a durometer A hardness of 60 or more specified in JIS K6203. As a result, a predetermined hardness can be secured, and a more stable scraping operation becomes possible. The friction body can also be applied as a touch pen or a stylus pen, and may be provided with conductivity.

Further, it is preferable that the friction body is colored with a color having a lightness value lower than that of the heat-discolorable ink contained in the refill. That is, when the heat-discoloring ink of the writing tool 1 is transferred to the surface of the friction body without discoloration when the friction body is used, the transfer of the heat-discoloring ink can be made inconspicuous. In particular, by setting the color of the friction body to black or the brightness value to 2.5 or less, it is possible to make the surface stains due to the use of the friction body inconspicuous.

The brightness value uses the Mansell 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 measures the surface of the heat-discolorable ink. The brightness value is a writing speed of 4.5 m / min on a paper surface (former JIS P3201; high-quality paper made from 100% chemical pulp, basis weight range 40 to 157 g / m2, whiteness 75.0% or more). It is obtained by measuring the ink on the drawn line written with a pitch interval of 0.1 mm.

1 Knock type writing tool 4 Axle cylinder 5 Refill 6 Spring 7 Breechblock 10 Knock button 20 Sliding member 30 Locking member 33 Cam surface 34 1st locking protrusion 34a Rear surface 34b Side side 35 2nd locking protrusion 35a Front 40 holding Member 44 Cam receiving surface 50 Third locking protrusion 50a Front surface 50b Rear surface

Claims (1)

A knock-type writing tool provided with a shaft cylinder and an operation unit provided so as to be movable back and forth with respect to the shaft cylinder.
Further, a locking portion that moves back and forth integrally with the operating portion and a locked portion provided on the inner peripheral surface of the barrel are further provided.
By moving the operation unit forward in the non-writing state, the locking portion and the locked portion are locked to enter the writing state.
In the writing state, by moving the operation unit backward without moving it forward, the locking is released and the writing state is set .
The operating portion has a locking member that can rotate around an axis, and the locking portion is provided on the locking member and is provided with the locking member.
A cam member is further provided, the locking member has a cam surface, and the cam member has a cam receiving surface that cooperates with the cam surface.
When the operating portion is moved forward in the non-writing state, the cam surface and the cam receiving surface cooperate to rotate the locking member, and the locking portion and the locked portion are engaged with each other. A knock-type writing tool characterized by stopping .

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