JP2017105054A - Knock-type writing utensil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a knock-type writing utensil that can relax shock which is applied to a refill when switching a writing state into a non-writing state, with a simple mechanism.SOLUTION: A knock-type writing utensil 1 comprises a barrel 2, a refill 3 arranged in the barrel 2, a spring 4 for energizing the refill 3 rearward, an operation part 20 which is pressed forward against energizing force of the spring 4 at the time of knocking operation and a main rotator 30, which further comprises: a decelerating rotator 40 which moves in a longitudinal direction together with the refill 3 resulting from switching between a writing state and a non-writing state which is performed by engagement or disengagement of the main rotator 30 with or from an engagement portion provided at the barrel 2 side; and a slope 13 on which the decelerating rotator 40 is rotated around a center shaft line in cooperation with the decelerating rotator 40 during rearward movement of the refill 3.SELECTED DRAWING: Figure 3

Description

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

  A refill containing ink by a knock operation that has an operation portion at the rear end of the shaft tube and presses the operation portion forward against the urging force of a spring disposed in the shaft tube, that is, writing The writing part which is the pen tip of the body switches to the writing state protruding from the tip of the shaft cylinder, and the writing part is immersed in the shaft cylinder by the knocking operation again or the pressing of the release part different from the operation part There are known knock-type writing instruments which are so-called knock-type switches.

  In general, in a knock type writing instrument, bubbles may be generated in ink in a refill due to an impact applied to the refill when switching from a writing state to a non-writing state. That is, when switching from the writing state to the non-writing state, the refill moves vigorously backward by the urging force of the spring, and an impact is applied when the refill is stopped. In particular, when low viscosity ink or shear thinning ink is contained in the refill, the ink may retreat due to the impact, and air may be mixed into the refill from the writing portion. In this case, bubbles may be generated in the ink, which may cause poor writing. (Hereinafter, the phenomenon that air is mixed into the refill due to the ink retreating is referred to as “ink back”.)

  In the knock-type writing instrument described in Patent Document 1, in addition to the first spring that biases the normal refill backward, the second spring that biases the refill forward is disposed at the rear end of the refill, whereby the impact described above. Has eased. Moreover, in the knock type writing instrument of patent document 1, the refill at the time of writing is stabilized by comprising so that all the wire materials of a 2nd spring may closely_contact | adhere at the time of writing.

  In the knock type writing instrument described in Patent Document 2, the protrusions and / or cam grooves of the rotor (rotating cam) are formed of an elastic body such as silicone rubber, butyl rubber, or thermoplastic elastomer. Thereby, the impact applied to the refill at the time of switching to the non-writing state is mitigated by elastic deformation of the protrusion of the rotor or the cam groove.

JP 2012-91468 A JP 2008-1000040 A

  However, in the knock type writing instrument of Patent Document 1, since the second spring is always in a fully compressed state during writing, the spring is deteriorated due to plastic deformation due to repeated use, and a sufficient impact relaxation effect is obtained. Disappear.

  Further, in the knock type writing instrument of Patent Document 2, the protrusion or cam groove formed of an elastic body is easily worn or deformed by repeated use compared to plastic or the like. Cannot be obtained sufficiently.

  An object of the present invention is to provide a knock-type writing instrument that can always relieve an impact applied to a refill when switching to a non-writing state despite long-term use.

  According to one aspect of the present invention, a shaft tube, a writing body disposed in the shaft tube, an elastic member that biases the writing body rearward, and a biasing force of the elastic member during a knocking operation. An operation portion that is pushed forward against the engagement member, and an engagement member, and the engagement member engages with or disengages from an engagement portion provided on the shaft cylinder side, A knock-type writing instrument that can be switched between a non-writing state, a reduction rotator that moves in the front-rear direction together with the writing body, and the reduced-speed rotation in cooperation with the reduction rotator during the backward movement of the writing body A knock type writing instrument is provided, further comprising a first cam surface that rotates the child about the central axis.

  According to another aspect, the engagement member rotates around the central axis in response to a knocking operation to switch between a writing state and a non-writing state.

  According to another aspect, the first cam surface is formed on the inner surface on the shaft cylinder side, and the reduction rotor has a first cam receiving surface that cooperates with the first cam surface, During the backward movement of the body, the first cam receiving surface acts on the first cam surface, and the reduction rotor rotates while moving backward.

  According to another aspect, the engagement member has a second cam surface, the reduction rotor has a second cam receiving surface that cooperates with the second cam surface, and the rear side of the writing body. The second cam receiving surface slides with respect to the second cam surface during the movement to.

  According to another aspect, the first cam receiving surface and the corresponding second cam receiving surface have slopes inclined in opposite directions.

  According to another aspect, there is provided a knock type writing instrument characterized in that the rotation of the reduction rotor stops by a collision with a regulating surface provided on the inner surface on the shaft cylinder side.

  According to another aspect, the first cam surface and the engaging portion are the same.

  According to another aspect, a closed space is defined by the engagement member and the reduction rotor, and the volume of the space changes during the backward movement of the writing body.

  According to the aspect of the present invention, it is possible to always alleviate the impact applied to the refill when switching to the non-writing state, regardless of long-term use. Further, it is possible to prevent the occurrence of ink back.

It is a longitudinal cross-sectional view of the writing state of the knock type writing instrument by 1st Embodiment of this invention. It is a longitudinal cross-sectional view of the non-writing state of the knock type writing instrument of FIG. It is an expanded sectional view of the rear-end part in the writing state of the knock type writing instrument of FIG. It is a perspective view of the inner cylinder of the knock type writing instrument of FIG. It is a longitudinal cross-sectional view of the inner cylinder of the knock type writing instrument of FIG. It is a perspective view of the operation part of the knock type writing instrument of FIG. It is a perspective view of the main rotor of the knock type writing instrument of FIG. It is another perspective view of the main rotor of the knock type writing instrument of FIG. It is a longitudinal cross-sectional view of the main rotor of the knock type writing instrument of FIG. It is a perspective view of the deceleration rotor of the knock type writing instrument of FIG. It is another perspective view of the reduction | decrease rotor of the knock type writing instrument of FIG. It is a schematic diagram which shows the relationship of each cam of the knock type writing instrument of FIG. It is a schematic diagram which shows switching from the writing state of the knock type writing instrument of FIG. 1 to a non-writing state. It is a longitudinal cross-sectional view in the writing state of the knock-type writing instrument by 2nd Embodiment of this invention, and the front end is facing upward. FIG. 15 is a longitudinal sectional view of the knocking writing instrument of FIG. 14 in a writing state and a front end facing downward. FIG. 15 is a longitudinal sectional view of the knocking writing instrument of FIG. 14 in a non-writing state and having a front end facing downward. FIG. 15 is a longitudinal sectional view of the knock-type writing instrument in FIG. 14 in a non-writing state with the front end facing upward. It is an expanded sectional view of the rear end part of the knock type writing instrument of FIG. It is a longitudinal cross-sectional view of the rear axis | shaft of the knock type writing instrument of FIG. It is a perspective view of the inner cylinder of the knock type writing instrument of FIG. It is a longitudinal cross-sectional view of the inner cylinder of the knock type writing instrument of FIG. It is a perspective view of the operation part of the knock type writing instrument of FIG. It is another perspective view of the operation part of the knock type writing instrument of FIG. It is a longitudinal cross-sectional view of the operation part of the knock type writing instrument of FIG. It is a perspective view of the main rotor of the knock type writing instrument of FIG. It is another perspective view of the main rotor of the knock type writing instrument of FIG. It is a longitudinal cross-sectional view of the main rotor of the knock type writing instrument of FIG. FIG. 15 is a perspective view of a reduction rotor of the knock type writing instrument in FIG. 14. FIG. 15 is another perspective view of the reduction rotor of the knock type writing instrument in FIG. 14. It is a longitudinal cross-sectional view of the deceleration rotor of the knock type writing instrument of FIG. It is a perspective view of the knocking member of the knock type writing instrument of FIG. It is another perspective view of the knocking member of the knock type writing instrument of FIG. It is a perspective view of the erasing member of the knock type writing instrument of FIG. It is a schematic diagram which shows the relationship of each cam of the knock type writing instrument of FIG. It is a schematic diagram which shows switching from the writing state of the knocking-type writing instrument of FIG. 14 to a non-writing state. It is a schematic diagram which shows switching from the non-writing state of the knocking-type writing instrument of FIG. 14 to a writing state.

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

  FIG. 1 is a longitudinal sectional view of a writing state of the knock type writing instrument 1 according to the first embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of the knocking type writing instrument 1 of FIG. These are the expanded sectional views of the rear-end part in the writing state of the knock type writing instrument 1 of FIG.

  The knock-type writing instrument 1 includes a cylindrical tube 2, a refill 3 that is a writing body that is disposed in the cylindrical tube 2 and includes a writing portion 3 a at one end, and an elasticity that biases the refill 3 backward. A spring 4 as a member, an inner cylinder 10 provided with a clip that is attached to the rear end of the shaft cylinder 2 and grips an article, a hollow operation unit 20 disposed in the inner cylinder 10, It has the main rotor 30 which is an engaging member arrange | positioned ahead, and the deceleration rotor 40 arrange | positioned ahead of the main rotor 30. FIG. As will be described later, the main rotor 30 cooperates with the outer cam 11 and the operation unit 20 of the inner cylinder 10, and the reduction rotor 40 cooperates with the outer cam 11 of the inner cylinder 10 and the main rotor 30.

  In the present specification, in the axial direction of the knock-type writing instrument 1, the writing part 3a side is defined as the “front” side, and the opposite side of the writing part 3a is defined as the “rear” side. The inner cylinder, the front shaft and the rear shaft described later are collectively referred to as a shaft cylinder. Unless otherwise specified, the center axis refers to the center axis of the knock type writing instrument 1. In the knock type writing instrument 1, the refill 3 moves in the axial direction in the axial tube 2 by a knocking operation that presses the operation unit 20 forward against the urging force of the spring 4. At this time, the state in which the writing unit 3a protrudes from the shaft tube 2 is referred to as a writing state (FIG. 1), and the state in which the writing unit 3a is immersed in the shaft tube 2 is referred to as a non-writing state (FIG. 2).

  4 is a perspective view of the inner cylinder 10 of the knock type writing instrument 1 of FIG. 1, and FIG. 5 is a longitudinal sectional view of the inner cylinder 10 of the knock type writing instrument 1 of FIG. In FIG. 5, the upper side is the front side of the knock type writing instrument 1. The inner cylinder 10 is fitted to the rear end portion of the shaft cylinder 2. An outer cam 11 is provided on the inner surface of the inner cylinder 10. The outer cam 11 has four protrusions 12 that extend in the front-rear direction and are connected to each other at the rear end. The four protrusions 12 are arranged at equal intervals along the circumferential direction. On the front end face of each of the protrusions 12, a slope 13 is formed that is inclined in the circumferential direction with respect to a plane perpendicular to the front-rear direction. The slope 13 constitutes a first cam surface. Each of the protrusions 12 has a vertical wall surface 14 that is a restricting surface extending along the front-rear direction. A contact surface 15 is formed on the front end surface of the portion connecting the four protrusions 12.

  FIG. 6 is a perspective view of the operation unit 20 of the knock type writing instrument 1 of FIG. In FIG. 6, the upper side is the front side of the knock type writing instrument 1. On the outer peripheral surface on the front side of the operation unit 20, eight protrusions 21 are provided at equal intervals along the circumferential direction. Each of the protrusions 21 is configured to move in the front-rear direction between the protrusions 12 of the outer cam 11 by a knocking operation. A cam surface 22 is formed on the front end surface of the operation unit 20. The cam surface 22 has eight peaks 23 and valleys 24 formed symmetrically. The eight peaks 23 and valleys 24 are connected by a slope 25.

  7 is a perspective view of the main rotor 30 of the knock type writing instrument 1 of FIG. 1, FIG. 8 is another perspective view of the main rotor 30 of the knock type writing instrument 1 of FIG. 1, and FIG. It is a longitudinal cross-sectional view of the main rotor 30 of the knock type writing instrument 1 of FIG. 7 to 9, the upper side is the front side of the knock type writing instrument 1.

  The main rotor 30 includes a large-diameter portion 30a and a small-diameter portion 30b that is formed behind the large-diameter portion 30a and is inserted into the operation unit 20 and used for centering. The large diameter portion 30a has a larger diameter than the small diameter portion 30b. Four longitudinal grooves 31 are formed on the outer peripheral surface of the large-diameter portion 30a at regular intervals along the circumferential direction and extending along the front-rear direction. The depth of the longitudinal groove 31 is shallower than the difference in radius between the large diameter portion 30a and the small diameter portion 30b. The large-diameter portion 30 a is formed with an inner cam 32 including four projecting portions 32 a defined by four vertical grooves 31. A cam receiving surface 33 that cooperates with the cam surface 22 of the operation unit 20 is formed on the rear end surface of the large-diameter portion 30a over the entire circumference. That is, the inner cam 32 has a cam receiving surface 33.

  The cam receiving surface 33 is formed in a saw blade shape and has eight inclined surfaces 34 inclined in the circumferential direction with respect to a plane perpendicular to the front-rear direction. In the eight inclined surfaces 34, every other inclined surface 34a is notched by the vertical groove 31 described above. Adjacent slopes 34 between adjacent longitudinal grooves 31 are connected by longitudinal wall surfaces 35 extending in the front-rear direction. That is, the cam receiving surface 33 has four vertical wall surfaces 35. Unlike the cam surface 22 of the operation unit 20, the cam receiving surface 33 of the main rotor 30 is formed in an asymmetric saw blade shape, but may be formed symmetrically similarly to the cam surface 22.

  A hole 36 having a cylindrical inner surface concentric with the central axis of the main rotor 30 is formed in the flat front end surface of the large diameter portion 30a. The reduction rotor 40 is inserted into the hole 36. The inner surface of the cylinder of the hole 36 has two different diameters, each of which is slightly larger than a later-described medium diameter portion 40b and small diameter portion 40c of the reduction rotor 40. In the hole 36, a deceleration cam surface 37, which is a second cam surface, is formed on the rear end surface of the small diameter portion arranged on the rear end side.

  The deceleration cam surface 37 is formed in a saw blade shape and has eight inclined surfaces 38 inclined in the circumferential direction with respect to a plane perpendicular to the front-rear direction. The adjacent slopes 38 of the deceleration cam surface 37 are connected by a vertical wall surface 39 extending along the front-rear direction. The slope 38 of the deceleration cam surface 37 and the slope 34 of the cam receiving surface 33 are inclined in opposite directions.

  The inner cam 32 engages with or disengages from the outer cam 11 when the main rotor 30 rotates around the central axis by a knocking operation. That is, the protrusion 32 a of the inner cam 32 engages with the protrusion 12 of the outer cam 11 or is disposed between the protrusions 12 of the outer cam 11 when the main rotor 30 rotates around the central axis by a knocking operation. . When the protrusion 32 a of the inner cam 32 is disposed between the protrusions 12 of the outer cam 11, the protrusion 12 of the outer cam 11 is disposed between the protrusions 32 a of the inner cam 32, that is, in the vertical groove 31.

  The cam surface 22 of the operation unit 20 and the cam receiving surface 33 of the main rotor 30 are such that when the inner cam 32 is engaged with or disengaged from the outer cam 11, the peak portion 23 of the cam surface 22 of the operation unit 20 is In the circumferential direction, the inner cam 32 is configured to be positioned on the slope 34 of the cam receiving surface 33. In other words, the inclined surface 25 of the cam surface 22 and the inclined surface 34 of the cam receiving surface 33 are arranged out of phase. For this reason, when the inclined surface 25 of the cam surface 22 presses the inclined surface 34 of the cam receiving surface 33 by the knocking operation, the main rotor 30 receives a circumferential component force due to the operation load and the urging force of the spring 4. Rotate around the central axis. On the other hand, the rotation of the operation unit 20 around the central axis is restricted by the protrusion 21 contacting the vertical wall surface 14 of the outer cam 11 in the circumferential direction.

  FIG. 10 is a perspective view of the reduction rotator 40 of the knock type writing instrument 1 of FIG. 1, and FIG. 11 is another perspective view of the reduction rotator 40 of the knock type writing instrument 1 of FIG. 10 and 11, the upper side is the front side of the knock type writing instrument 1. The reduction rotor 40 is made of the same material as that of the main rotor 30, but may be made of a different material.

  The reduction rotor 40 includes a large diameter portion 40a, a medium diameter portion 40b formed behind the large diameter portion 40a, and a small diameter portion 40c formed behind the medium diameter portion 40b. The large diameter portion 40a has a larger diameter than the medium diameter portion 40b, and the medium diameter portion 40b has a larger diameter than the small diameter portion 40c. The medium diameter part 40 b and the small diameter part 40 c are inserted into the holes 36 of the main rotor 30.

  An annular protrusion is formed on the outer peripheral surface of the large-diameter portion 40a, and a first deceleration cam receiving surface 41, which is a first cam receiving surface, is formed on the front end surface of the annular protrusion. The first deceleration cam receiving surface 41 is formed in a saw blade shape and has eight inclined surfaces 42 inclined in the circumferential direction with respect to a plane perpendicular to the front-rear direction. The adjacent inclined surfaces 42 of the first deceleration cam receiving surface 41 are connected by a vertical wall surface 43 extending along the front-rear direction.

  A rear end surface of the middle diameter portion 40 b is a second cam receiving surface that is disposed opposite to the speed reduction cam surface 37 of the main rotor 30 and that is complementary to the speed reduction cam surface 37. Two deceleration cam receiving surfaces 44 are formed. Therefore, the second deceleration cam receiving surface 44 is formed in a saw blade shape like the deceleration cam surface 37 of the main rotor 30, and is inclined in the circumferential direction with respect to a plane perpendicular to the front-rear direction. A slope 45 is provided. The adjacent inclined surfaces 45 of the second deceleration cam receiving surface 44 are connected by a vertical wall surface 46 extending along the front-rear direction. The slope 42 of the first deceleration cam receiving surface 41 and the slope 45 of the second deceleration cam receiving surface 44 are inclined in opposite directions. The slope 42 of the first deceleration cam receiving surface 41 is inclined in the same direction as the slope 13 of the outer cam 11.

  A flat refill support surface 47 is formed on the rear end surface of the large diameter portion 40 a, that is, on the front end surface of the reduction rotor 40. The refill support surface 47 is always in contact with the rear end surface of the refill 3 urged rearward by the spring 4. Therefore, the reduction rotor 40 moves in the front-rear direction together with the refill 3. A flat rotor contact surface 48 is formed on the front end surface of the large diameter portion 40a. The rotor contact surface 48 contacts the rear end surface of the main rotor 30 when the reduction cam surface 37 of the main rotor 30 and the second reduction cam receiving surface 44 of the reduction rotor 40 mesh with each other. .

  The urging force of the spring 4 is transmitted to the operation unit 20 and the main rotor 30 mainly via the refill support surface 47 and the rotor contact surface 48 of the reduction rotor 40. In other words, except when the outer cam 11 and the inner cam 32 are engaged, the operation unit 20, the main rotor 30, and the reduction rotor 40 move together.

  FIG. 12 is a schematic diagram showing the relationship between the cams of the knocking type writing instrument 1 of FIG. That is, FIG. 12 is a schematic diagram showing a positional relationship among the outer cam 11 of the inner cylinder 10, the operation unit 20, the main rotor 30, and the reduction rotor 40 in the writing state of the knock type writing instrument 1. More specifically, with respect to the outer cam 11 developed in the circumferential direction, the projection 21 and the cam surface 22 of the operation unit 20, the cam receiving surface 33 and the deceleration cam surface 37 of the main rotor 30, and the reduced rotation The positions of the first deceleration cam receiving surface 41 and the second deceleration cam receiving surface 44 of the child 40 are shown. However, since the speed reduction cam surface 37 of the main rotor 30 and the second speed reduction cam receiving surface 44 of the speed reduction rotor 40 are disposed radially inward from the other cams, in FIG. The corresponding positions are similarly shown. In the drawing, the upper side is the front side of the knocking type writing instrument 1, and the lower side is the rear side of the knocking type writing instrument 1.

  In the writing state of the knock type writing instrument 1, the inner cam 32 is engaged with the outer cam 11, thereby maintaining the writing state. That is, the inclined surface 34 and the vertical wall surface 35 of the cam receiving surface 33 of the inner cam 32 are engaged with the inclined surface 13 and the vertical wall surface 14 of the projection 12 of the outer cam 11, thereby restricting the backward movement and rotation of the main rotor 30. Has been. At this time, the deceleration cam surface 37 of the main rotor 30 and the second deceleration cam receiving surface 44 of the deceleration rotor 40 are engaged with each other.

  FIG. 13 is a schematic diagram showing switching from the writing state to the non-writing state of the knock type writing instrument 1 of FIG. The main rotor 30 is given a rotational force by the cam mechanism of the cam surface 22 of the operation unit 20 and the cam receiving surface 33 of the main rotor 30 described above, and moves from the left to the right in the figure for every knock operation. The schematic diagram in FIG. 13 is shown in FIG. 12 except that the speed reduction cam surface 37 of the main rotor 30 and the second speed reduction cam receiving surface 44 of the speed reduction rotor 40 are shifted downward in the drawing for convenience. This is the same as the schematic diagram.

  FIG. 13A shows the knock-type writing instrument 1 in a writing state, which is the same state as FIG. From this state, when the operating portion 20 is pressed against the urging force of the spring 4 and the operating portion 20 and the main rotor 30 are moved forward, the inner cam 32 is moved as shown in FIG. The rear end portion of the vertical wall surface 35 of the cam receiving surface 33 exceeds the front end portion of the protrusion 12 of the outer cam 11 in the front-rear direction. At this time, the inclined surface 34 of the cam receiving surface 33 of the main rotor 30 and the inclined surface 13 of the outer cam 11 coincide with each other, and the rotation about the central axis of the main rotor 30 by the vertical wall surface 14 of the protrusion 12 of the outer cam 11. Will be lifted. The deceleration cam surface 37 of the main rotor 30 and the second deceleration cam receiving surface 44 of the deceleration rotor 40 are engaged with each other.

  When the pressing of the operation unit 20 is released from the state of FIG. 13B, the operation unit 20, the main rotor 30 and the reduction rotor 40 are moved backward by the biasing force of the spring 4. At this time, the rotation of the main rotor 30 around the central axis is not restricted by the vertical wall surface 14 of the protrusion 12 of the outer cam 11. Therefore, due to the biasing force of the spring 4 via the refill 3 and the reduction rotor 40, the inclined surface 34 of the cam receiving surface 33 of the main rotor 30 moves along the inclined surface 13 of the outer cam 11 or the inclined surface 25 of the cam surface 22 of the operation unit 20. When pressed, the main rotor 30 receives a circumferential force and rotates around the central axis (counterclockwise when the knocking writing instrument 1 is viewed from the front).

  Since the main rotor 30 moves backward while rotating, as shown in FIG. 13C, the protrusion 32 a of the inner cam 32 is disposed between the protrusions 12 of the outer cam 11, and the protrusion 12 of the outer cam 11. Are arranged between the protrusions 32 a of the inner cam 32, that is, in the longitudinal groove 31. As a result, the engagement between the outer cam 11 and the inner cam 32 is released. Since the protrusion 21 abuts on the vertical wall surface 14 of the outer cam 11 in the circumferential direction, the rotation of the operation unit 20 around the central axis is always restricted.

  From the state of FIG. 13C, when the operation unit 20, the main rotor 30 and the reduction rotor 40 are integrally moved backward more vigorously, immediately before the switching of the knock type writing instrument 1 to the non-writing state, that is, refilling. In this embodiment, immediately before the refill 3 stops moving backward, the slope of the first reduction cam receiving surface 41 of the reduction rotor 40 as shown in FIG. 42 abuts on the slope 13 of the outer cam 11.

  In the state of FIG. 13 (d), when the inclined surface 42 of the first deceleration cam receiving surface 41 of the deceleration rotor 40 presses the inclined surface 13 of the outer cam 11 by the biasing force of the spring 4 through the refill 3, the deceleration rotor 40. Rotates around the central axis in response to the circumferential force. That is, the slope 13 of the outer cam 11 rotates the reduction rotor 40 around the central axis in cooperation with the first reduction cam receiving surface 41 of the reduction rotor 40 during the rearward movement of the refill 3. In other words, the slope 42 of the first deceleration cam receiving surface 41 of the reduction rotor 40 slides with respect to the slope 13 of the outer cam 11. That is, the speed reduction rotor 40 rotates while the first speed reduction cam receiving surface 41 acts on the outer cam 11 while the refill 3 is moving rearward, whereby the speed reduction rotor 40 moves rearward. Simultaneously with this sliding, the inclined surface 45 of the second deceleration cam receiving surface 44 of the deceleration rotor 40 slides against the inclined surface 38 of the deceleration cam surface 37 of the main rotor 30, and the deceleration cam surface of the main rotor 30. 37 and the second reduction cam receiving surface 44 of the reduction rotor 40 are disengaged.

  The rotation of the reduction rotor 40 stops when the vertical wall surface 43 of the first deceleration cam receiving surface 41 collides with the vertical wall surface 14 of the protrusion 12 of the outer cam 11. The rotation direction of the reduction rotor 40 is the same as the rotation direction of the main rotor 30.

  FIG. 13 (e) shows a state in which the rotation of the reduction rotor 40 has stopped and the switching to the non-writing state has been completed, that is, a state in which the backward movement of the refill 3 has been stopped. At this time, the inclined surface 42 and the vertical wall surface 43 of the first deceleration cam receiving surface 41 are engaged with the inclined surface 13 and the vertical wall surface 14 of the projection 12 of the outer cam 11, thereby restricting the backward movement and rotation of the reduction rotor 40. Has been. Therefore, the backward movement of the operation unit 20 and the main rotor 30 is similarly restricted. Further, the backward movement of the operation unit 20 and the main rotor 30 is also restricted by the rear end surface of the projection 21 of the operation unit 20 coming into contact with the contact surface 15 of the outer cam 11. Since the operation unit 20, the main rotor 30, and the reduction rotor 40 are prevented from moving backward, the refill 3 is also prevented from moving backward. As a result, the non-writing state of the knock type writing instrument 1 is maintained.

  From the writing state of the knock-type writing instrument 1 shown in FIG. 13A to the time when the inclined surface 42 of the reduction rotor 40 contacts the inclined surface 13 of the outer cam 11 as shown in FIG. The deceleration cam surface 37 of the rotor 30 and the second deceleration cam receiving surface 44 of the deceleration rotor 40 are engaged with each other. On the other hand, as described above, the reduction rotator 40 rotates during the backward movement of the refill 3, whereby the reduction cam surface 37 of the main rotor 30 and the second reduction cam receiving surface 44 of the reduction rotator 40. The meshing is released.

  The rotation of the reduction rotor 40, in other words, the sliding of the inclined surface 42 of the first reduction cam receiving surface 41 of the reduction rotor 40 with respect to the inclined surface 13 of the outer cam 11, and the inclined surface 38 of the reduction cam surface 37 of the main rotor 30. The sliding of the slope 45 of the second deceleration cam receiving surface 44 of the reduction rotor 40 is performed against the frictional resistance between these slopes. That is, when the refill 3 is switched to the non-writing state, the refill 3 moves backward vigorously by the urging force of the spring 4, but part of the kinetic energy is reduced when the refill 3 moves backward. It is converted into frictional heat generated by the kinetic energy by the rotation of the above and the slide of the slope described above. As a result, the impact applied when the refill 3 is stopped is reduced and mitigated by the amount of kinetic energy due to rotation and the kinetic energy converted into frictional heat.

  Ink back that occurs as a result of the impact applied to the refill 3 is particularly likely to be caused by an impact in the front-rear direction applied by stopping the refill 3, but the occurrence of ink back can be suppressed by simultaneously applying impact in a different direction. Can do. Specifically, when the rotation of the reduction rotor 40 is stopped, that is, when the vertical wall surface 43 of the first deceleration cam receiving surface 41 collides with the vertical wall surface 14 of the protrusion 12 of the outer cam 11 in the circumferential direction. The impact of can be used.

  Furthermore, a closed space, that is, a substantially sealed space is defined by the main rotor 30 and the reduction rotor 40. Specifically, a space S <b> 1 is defined between the inner peripheral surface of the hole 36 of the main rotor 30 and the medium diameter portion 40 b and the small diameter portion 40 c of the reduction rotor 40 inserted into the hole 36. As described above, the rotation of the reduction rotor 40 with respect to the main rotor 30 and the reduction cam surface 37 of the main rotor 30 and the second reduction cam receiving surface 44 of the reduction rotor 40 due to the rotation of the reduction rotor 40. Due to the change in meshing, the volume of the space S1 is changed, that is, compressed and expanded. Due to the change in the volume of the space S1, the internal pressure changes in a complicated manner, thereby causing a damper effect that reduces the moving speed of the refill 3 during the rearward movement of the refill 3. As a result, the impact applied when the refill 3 is stopped can be reduced.

  14 is a longitudinal sectional view of the knock type writing instrument 100 according to the second embodiment of the present invention in the writing state and the front end is upward, and FIG. 15 is a writing state of the knock type writing instrument 100 in FIG. 14 and the front end is downward. 16 is a vertical sectional view of the knocking writing instrument 100 of FIG. 14 in a non-writing state and the front end is downward, and FIG. 17 is a non-writing state of the knocking writing instrument 100 of FIG. And it is a longitudinal cross-sectional view with the front end facing upward. FIG. 18 is an enlarged cross-sectional view of the rear end portion of the knock type writing instrument 100 of FIG. 14 to 17, the upper part is vertically upward, and the lower part is vertically downward. That is, gravity acts downward in each figure.

  The knock-type writing instrument 100 includes a cylindrical tube 102 formed in a cylindrical shape, a refill 3 which is a writing body disposed in the cylindrical tube 102 and provided with a writing portion 3a at one end, and an elastic force which urges the refill 3 backward. A spring 4 as a member, an inner cylinder 110 provided with a clip attached to the rear end portion of the shaft cylinder 102 and gripping an article, a hollow operation section 120 disposed in the inner cylinder 110, and an inside of the operation section 120 The main rotor 130 which is an engaging member disposed in the main body 130, the reduction rotor 140 disposed in front of the main rotor 130 in the operation unit 120, and the cylinder disposed in front of the operation unit 120. Further, it has a knocking member 150, a locking part 160 that locks the knocking clock member 150, and an erasing member 170 attached to the rear end of the operation part 120. The shaft cylinder 102 has a front shaft 102a and a rear shaft 102b. The inner cylinder 110, the front shaft 102a, and the rear shaft 102b are collectively referred to as a shaft cylinder.

  The main rotor 130 cooperates with the outer cam 111 and the operation unit 120 of the inner cylinder 110, and the reduction rotor 140 cooperates with the outer cam 111 and the main rotor 130 of the inner cylinder 110. In addition, the lock cam surface 122 of the operation portion 120 and the lock cam receiving surface 151 of the knock clock member 150 cooperate to rotate the knock clock member 150 about the central axis, thereby engaging the knock clock member 150 and the locking portion 160. Let it stop. Details will be described below.

  The knock lock member 150 can move in the longitudinal direction in the shaft cylinder 102 by gravity. 14 and 15 show the same writing state of the knock-type writing instrument 100. In FIG. 14, the front end of the knock-type writing instrument 100, that is, the front end of the shaft cylinder 102 faces upward. Reference numeral 150 denotes a rear end side in the shaft cylinder 102. On the other hand, in FIG. 15, since the front end of the knock type writing instrument 100, that is, the front end of the shaft cylinder 102 faces downward, the knock clock member 150 is closer to the front end side in the shaft cylinder 102 than in FIG. 14. .

  Similarly, FIG. 16 and FIG. 17 show the same non-writing state of the knock type writing instrument 100, but in FIG. 16, since the front end of the knock type writing instrument 100, that is, the front end of the shaft cylinder 102 is facing downward, The lock member 150 is close to the front end side in the shaft cylinder 102. On the other hand, in FIG. 17, since the front end of the knock type writing instrument 100, that is, the front end of the shaft cylinder 102 is upward, the knock clock member 150 is closer to the rear end side in the shaft cylinder 102 than in FIG. Yes.

  FIG. 19 is a longitudinal sectional view of the rear shaft 102b of the knock type writing instrument 100 of FIG. In FIG. 19, the upper side is the front side of the knock type writing instrument 100. A locking portion 160 is provided at an intermediate portion of the inner surface of the rear shaft 102b. The locking part 160 has six second protrusions 161 arranged at equal intervals along the circumferential direction as second protrusions with respect to the first protrusion 152 of the knock clock member 150 described later. The second protrusion 161 has a parallelogram in cross section. In addition, a slope 162 that is inclined in the circumferential direction with respect to a plane perpendicular to the front-rear direction is formed on the rear end face of the second protrusion 161.

  20 is a perspective view of the inner cylinder 110 of the knock type writing instrument 100 of FIG. 14, and FIG. 21 is a longitudinal sectional view of the inner cylinder 110 of the knock type writing instrument 100 of FIG. In FIG. 21, the upper side is the front side of the knock type writing instrument 100. The inner cylinder 110 is fitted to the rear end portion of the shaft cylinder 102. An outer cam 111 is provided on the inner surface of the inner cylinder 110. The outer cam 111 has three projections 112 arranged at equal intervals along the circumferential direction. On the front end surface of each of the protrusions 112, a slope 113 is formed that is inclined in the circumferential direction with respect to a plane perpendicular to the front-rear direction. The slope 113 constitutes a first cam surface. Each of the protrusions 112 has a vertical wall surface 114 that is a restriction surface extending along the front-rear direction. Each of the protrusions 112 is provided on the inner surface of the inner cylinder 110 via a guide protrusion 115 having a larger cross-sectional area.

  22 is a perspective view of the operation unit 120 of the knock type writing instrument 100 of FIG. 14, FIG. 23 is another perspective view of the operation unit 120 of the knock type writing instrument 100 of FIG. 14, and FIG. It is a longitudinal cross-sectional view of the operation part 120 of the knock type writing instrument 100. 22 to 24, the upper side is the front side of the knock type writing instrument 100.

  The operation unit 120 is a cylindrical member. The operation unit 120 includes a cylindrical portion 121 having a smooth outer peripheral surface at the central portion in the axial direction. The front of the cylindrical portion 121 is formed to have a slightly larger outer diameter, and a saw blade-like lock cam surface 122 is formed on the front end surface thereof. The lock cam surface 122 has six peaks 122a and valleys 122b. Specifically, the peak portion 122a and the locking cam surface 122 have an inclined portion 122c inclined in the circumferential direction with respect to a plane perpendicular to the front-rear direction, and a vertical wall portion 122d extending along the front-rear direction. A trough 122b is configured. The crest 122a of the lock cam surface 122 of the operation unit 120 is asymmetrical along the circumferential direction, but may be symmetrical.

  A guide part 123 is formed behind the cylindrical part 121. A rear wall 123 a is provided at the rear end of the guide portion 123. In the guide portion 123, three slits 123b are formed along the axial direction. The three slits 123b are provided at equal intervals along the circumferential direction so as to penetrate to the inside. Accordingly, the three slits 123b define the three pillar portions 124 having a substantially fan-shaped cross section.

  On each inner surface of the pillar portion 124, a protrusion portion 124a extending forward from the inner surface of the rear wall 123a is formed. A V-shaped cam surface 125 defined in a V shape that opens obtusely toward the front is formed on the front end surface of each protrusion 124a. That is, three V-shaped cam surfaces 125 are formed on the inner surface of the guide portion 123. A hollow fitting portion 126 extending rearward is formed on the rear end surface of the guide portion 123, that is, on the rear end surface of the rear wall 123 a of the guide portion 123. A fitting protrusion 126 a extending radially outward is formed on the outer peripheral surface of the fitting portion 126.

  The operation unit 120 is inserted into the inner cylinder 110 from the front. At that time, the guide protrusion 115 of the inner cylinder 110 is disposed in the slit 123 b of the operation unit 120, and thus the column part 124 of the operation unit 120 is disposed between the guide protrusions 115 of the inner cylinder 110. By arranging the guide protrusion 115 of the inner cylinder 110 in the slit 123b of the operation unit 120, the operation unit 120 is restricted from rotating around the central axis and can be moved in the front-rear direction along the slit 123b. Become. In addition, each of the protrusions 112 provided on the guide protrusion 115 protrudes into the guide part 123 of the operation part 120 through the slit 123b, and the protrusion amount is the protrusion of the protrusion 124a from the inner surface of the column part 124. It is almost the same as the amount. Therefore, the projection 112 of the inner cylinder 110 and the projection 124a of the operation unit 120 work together on the inner cam 132 of the main rotor 130 described later.

  25 is a perspective view of the main rotor 130 of the knocking writing instrument 100 of FIG. 14, FIG. 26 is another perspective view of the main rotor 130 of the knocking writing instrument 100 of FIG. 14, and FIG. It is a longitudinal cross-sectional view of the main rotor 130 of the knock type writing instrument 100 of FIG. 25 to 27, the upper side is the front side of the knock type writing instrument 100.

  The main rotor 130 includes a large-diameter portion 130a and a small-diameter portion 130b that is formed behind the large-diameter portion 130a and is inserted into the operation unit 120 and used for centering. The large diameter portion 130a has a larger diameter than the small diameter portion 130b. The outer diameter of the large-diameter portion 130a is set slightly smaller than the inner diameter of the cylindrical portion 121 of the operation unit 120 to be inserted.

  On the outer peripheral surface of the large-diameter portion 130a, six vertical grooves 131 that are arranged at equal intervals along the circumferential direction and extend along the front-rear direction are formed. The depth of the vertical groove 131 is shallower than the difference in radius between the large diameter portion 130a and the small diameter portion 130b. The large-diameter portion 130 a is formed with an inner cam 132 including three protrusions 132 a defined by three vertical grooves 131. A cam receiving surface 133 that cooperates with the V-shaped cam surface 125 of the operation unit 120 is formed on the rear end surface of the large-diameter portion 130a over the entire circumference. That is, the inner cam 132 has a cam receiving surface 133.

  The cam receiving surface 133 is formed in a saw blade shape and has twelve inclined surfaces 134 inclined in the circumferential direction with respect to a plane perpendicular to the front-rear direction. In the three inclined surfaces 134, every other inclined surface 134a is notched by the vertical groove 131 described above. Adjacent slopes 134 between adjacent longitudinal grooves 131 are connected by longitudinal wall surfaces 135 extending in the front-rear direction. That is, the cam receiving surface 133 has three vertical wall surfaces 135. The cam receiving surface 133 of the main rotor 130 is formed in an asymmetric saw blade shape, but may be formed symmetrically.

  A hole 136 having a cylindrical inner surface concentric with the central axis of the main rotor 130 is formed in the flat front end surface of the large diameter portion 130a. The reduction rotor 140 is inserted into the hole 136. The inner surface of the cylinder of the hole 136 has two different diameters, each of which is slightly larger than a later-described medium diameter portion 140b and small diameter portion 140c of the reduction rotor 140. In the hole 136, a deceleration cam surface 137, which is a second cam surface, is formed on the rear end surface of the small diameter portion disposed on the rear end side.

  The deceleration cam surface 137 is formed in a saw blade shape and has six inclined surfaces 138 inclined in the circumferential direction with respect to a plane perpendicular to the front-rear direction. The adjacent slope 138 of the deceleration cam surface 137 is connected by a vertical wall surface 139 extending along the front-rear direction. The slope 138 of the deceleration cam surface 137 and the slope 134 of the cam receiving surface 133 are inclined in opposite directions.

  The main rotor 130 is inserted into the operation unit 120 from the front. The inner cam 132 of the main rotor 130 is engaged with or disengaged from the outer cam 111 when the main rotor 130 rotates around the central axis by a knocking operation. That is, the protrusion 132a of the inner cam 132 engages with the protrusion 112 of the outer cam 111 protruding into the operation portion 120 via the slit 123b when the main rotor 130 rotates around the central axis by a knocking operation. It is disposed between the protrusions 112 of the outer cam 111. When the inner cam 132 is disposed between the outer cams 111, the protrusion 112 of the outer cam 111 is disposed between the protrusions 132 a of the inner cam 132, that is, in the vertical groove 131.

  The V-shaped cam surface 125 of the operation unit 120 and the cam receiving surface 133 of the main rotor 130 are connected to the V-shaped cam surface 125 and the cam receiving surface 133 when the inner cam 132 is engaged with or disengaged from the outer cam 111. Are configured to be out of phase. For this reason, when the inclined surface of the V-shaped cam surface 125 presses the inclined surface 134 of the cam receiving surface 133 by a knocking operation, the main rotor 130 receives a circumferential component force due to the operation load and the urging force of the spring 4. Rotate around the center axis. On the other hand, as described above, the operation unit 120 is restricted from rotating around the central axis by disposing the guide protrusion 115 of the inner cylinder 110 in the slit 123b.

  28 is a perspective view of the reduction rotator 140 of the knock type writing instrument 100 of FIG. 14, FIG. 29 is another perspective view of the reduction rotator 140 of the knock type writing instrument 100 of FIG. 14, and FIG. It is a longitudinal cross-sectional view of the reduction | restoration rotor 140 of the knock type writing instrument 100 of FIG. 28 to 30, the upper side is the front side of the knock type writing instrument 100. Reduction rotor 140 is formed of the same material as main rotor 130, but may be formed of a different material.

  The reduction rotor 140 includes a large-diameter portion 140a, a medium-diameter portion 140b formed behind the large-diameter portion 140a, and a small-diameter portion 140c formed behind the medium-diameter portion 140b. The large diameter portion 140a has a larger diameter than the medium diameter portion 140b, and the medium diameter portion 140b has a diameter larger than that of the small diameter portion 140c. The medium diameter portion 140b and the small diameter portion 140c are inserted into the hole 136 of the main rotor 130.

  An annular protrusion is formed on the outer peripheral surface of the large-diameter portion 140a, and a first deceleration cam receiving surface 141 that is a first cam receiving surface is formed on the front end surface of the annular protrusion. The first deceleration cam receiving surface 141 is formed in a saw blade shape and has six inclined surfaces 142 inclined in the circumferential direction with respect to a plane perpendicular to the front-rear direction. The adjacent slope 142 of the first deceleration cam receiving surface 141 is connected by a vertical wall surface 143 extending along the front-rear direction.

  A rear end surface of the middle diameter portion 140b is disposed opposite to the deceleration cam surface 137 of the main rotor 130, and is a second cam receiving surface having a complementary shape so as to mesh with the deceleration cam surface 137. Two deceleration cam receiving surfaces 144 are formed. Therefore, the second deceleration cam receiving surface 144 is formed in a saw blade shape like the deceleration cam surface 137 of the main rotor 130, and is inclined in the circumferential direction with respect to a plane perpendicular to the front-rear direction. A slope 145 is provided. The adjacent inclined surfaces 145 of the second deceleration cam receiving surface 144 are connected by a vertical wall surface 146 extending along the front-rear direction. The slope 142 of the first deceleration cam receiving surface 141 and the slope 145 of the second deceleration cam receiving surface 144 are inclined in opposite directions. The slope 142 of the first deceleration cam receiving surface 141 is inclined in the same direction as the slope 113 of the outer cam 111.

  A flat refill support surface 147 is formed on the rear end surface of the large diameter portion 140 a, that is, on the front end surface of the reduction rotor 140. The refill support surface 147 is always in contact with the rear end surface of the refill 3 urged rearward by the spring 4. Accordingly, the reduction rotor 140 moves in the front-rear direction together with the refill 3. A flat rotor contact surface 148 is formed on the front end surface of the large-diameter portion 140a. The rotor contact surface 148 is in contact with the rear end surface of the main rotor 130 when the reduction cam surface 137 of the main rotor 130 and the second reduction cam receiving surface 144 of the reduction rotor 140 are engaged with each other. .

  The biasing force of the spring 4 is transmitted to the operation unit 120 and the main rotor 130 mainly through the refill support surface 147 and the rotor contact surface 148 of the reduction rotor 140. In other words, except when the outer cam 111 and the inner cam 132 are engaged, the operation unit 120, the main rotor 130, and the reduction rotor 140 move together.

  FIG. 31 is a perspective view of the knock clock member 150 of the knock type writing instrument 100 of FIG. 14, and FIG. 32 is another perspective view of the knock clock member 150 of the knock type writing instrument 100 of FIG. 31 and 32, the upper side is the front side of the knock type writing instrument 100. The knock lock member 150 is formed of the same material as that of the main rotor 130, but may be formed of a different material.

  The knock clock member 150 is a cylindrical member. The knock lock member 150 is penetrated by the refill 3 and is movable in the front-rear direction between the operation portion 120 and the locking portion 160 of the shaft tube 102. A lock cam receiving surface 151 having a shape complementary to the lock cam surface 122 of the operation unit 120 is formed on the rear end surface of the knock lock member 150. Similarly to the lock cam surface 122 of the operation unit 120, the lock cam receiving surface 151 has six peak portions 151a and valley portions 151b. That is, the lock cam receiving surface 151 of the knock lock member 150 has a slanted portion 151c inclined in the circumferential direction with respect to a plane perpendicular to the front-rear direction, and a vertical wall portion 151d extending along the front-rear direction. A mountain portion 151a and a valley portion 151b are configured.

  Six first protrusions 152 are provided on the outer peripheral surface of the cylindrical portion 150 a of the knock clock member 150. The first protrusions 152 extend in the front-rear direction and are arranged at equal intervals along the circumferential direction. Six guide grooves 153 extending in the front-rear direction are defined by the adjacent first protrusions 152.

  On the side surface 152a in the circumferential direction of the first protrusion 152, in particular, on the side surface 152a of the front end portion, a circumferential recess 154 is formed. The bottom surface of the recess 154 is a side surface 155 that is parallel to the side surface 152 a in the circumferential direction of the first protrusion 152. The rear inner surface of the recess 154 is a slope 156 that is inclined in the circumferential direction with respect to a plane perpendicular to the front-rear direction. The recess 154 is formed in a step shape when viewed from the front to the rear of the first protrusion 152. The side surface 155 of the first protrusion 152 plays a role of restricting the rotation of the knock lock member 150 around the central axis.

  Each of the guide grooves 153 of the knock clock member 150 accommodates the second protrusion 161 of the locking portion 160 of the corresponding shaft tube 102 therein, and is relatively movable back and forth within the guide groove 153. Yes.

  The lock cam surface 122 of the operation portion 120 and the lock cam receiving surface 151 of the knock clock member 150 are formed on the lock cam surface 122 when the second protrusion 161 of the locking portion 160 is received in the guide groove 153 of the knock clock member 150. The mountain portion 122a is configured to be positioned on the inclined portion 151c of the lock cam receiving surface 151 in the circumferential direction. For this reason, for example, when the front end of the knock type writing instrument 100 is directed upward as shown in FIG. 14, the knock clock member 150 comes into contact with the operation unit 120 by the action of gravity, but the knock clock member 150 is knocked due to its own weight. The lock member 150 receives a circumferential force and rotates around the central axis. On the other hand, the operation unit 120 is restricted from rotating around the central axis line by arranging the guide protrusion 115 of the inner cylinder 110 in the slit 123b.

  FIG. 33 is a perspective view of the erasing member 170 of the knocking writing instrument 100 of FIG. Referring to FIG. 18 together with FIG. 33, the erasing member 170 is provided at the rear end portion of the holding member 171 and is attached to the rear end portion of the operation unit 120 via the holding member 171. In other words, a part of the operation unit 120 functions as an erasing unit. The erasing member 170 is provided on the holding member 171 by adhesion or two-color molding.

  The holding member 171 has a holding portion main body 172. The front part of the holding part main body 172 is formed in a cylindrical shape that opens forward. Three rectangular openings 173 are formed on the outer peripheral surface of the cylindrical portion. A flange portion 174 is formed on the outer peripheral surface in front of the opening 173. The holding member 171 is attached to the fitting portion 126 of the operation unit 120 by fitting. That is, the fitting protrusion 126 a of the fitting portion 126 of the operation portion 120 is fitted into the opening 173 of the holding portion main body 172. The rear portion of the holding portion main body 172 is formed into a tapered truncated pyramid shape as a whole together with the erasing member 170.

  A cover member 180 is attached to the erasing member 170 as shown in FIG. Specifically, the cover member 180 is detachably fitted to the holding portion main body 172. The front end surface of the cover member 180 is in contact with the rear end surface of the flange portion 174 of the holding member 171. Since the erasing member 170 is covered by the cover member 180 except when in use, the erasing member 170 can be prevented from being soiled. An air hole is formed in the closed end surface of the rear end of the cover member 180.

  The erasing member 170 and the cover member 180 are always arranged at the positions as shown in FIG. 18, that is, the retreat limit, regardless of whether the knocking writing instrument 100 is in a writing state or a non-writing state. In this regard, as described above, since the erasing member 170 is attached to the operation unit 120 via the holding member 171, the operation unit 120, the erasing member 170, the holding member 171 and the cover member 180 are integrated. Moving.

  As shown in FIG. 18, an urging spring 190 that is an elastic member is disposed inside the hollow fitting portion 126 of the operation portion 120. One end of the urging spring 190 is supported by the rear end surface of the small diameter portion 130b of the main rotor 130, and urges the operation unit 120 rearward. Thereby, the erasing member 170 and the cover member 180 are always arranged at the same position in the axial direction, that is, in the retreat limit, regardless of whether the knocking writing instrument 100 is in a writing state or a non-writing state. In other words, the main rotor 130 is disposed forward or rearward depending on the state of the knocking writing instrument 100, but the biasing spring 190 is configured to always bias the operation unit 120 rearward at any position. Length and spring constant are set.

  Since the erasing member 170 is always in the retreat limit position, the protruding amount of the erasing member 170 from the rear end portion of the shaft cylinder 102 is the same in both the non-writing state and the writing state. Therefore, when erasing the handwriting with the knocking writing instrument 100 using the erasing member 170, the erasing member 170 can be visually recognized equally in a writing state or a non-writing state. As a result, it is possible to easily aim at an intended location and perform an accurate rubbing operation.

  FIG. 34 is a schematic diagram showing the relationship between the cams of the knocking writing instrument 100 of FIG. That is, FIG. 34 shows the relationship between the outer cam 111, the operation unit 120, the main rotor 130, the reduction rotor 140, and the knock clock member 150 of the inner cylinder 110 in the writing state of the knock type writing instrument 100 and the front end facing downward. It is a schematic diagram which shows the positional relationship with the stop part 160. FIG. More specifically, for the outer cam 111 developed in the circumferential direction, the lock cam surface 122 and the V-shaped cam surface 125 of the operation unit 120, the cam receiving surface 133 and the deceleration cam surface 137 of the main rotor 130, Positions of the first deceleration cam receiving surface 141 and the second deceleration cam receiving surface 144 of the deceleration rotor 140, the lock cam receiving surface 151 and the first protrusion 152 of the knock lock member 150, and the locking portion 160 of the shaft cylinder 102 Is shown.

  However, the speed reduction cam surface 137 of the main rotor 130 and the second speed reduction cam receiving surface 144 of the speed reduction rotor 140 are disposed radially inward from the other cams. The corresponding positions are similarly shown. In FIG. 34, the upper side is the front side of the knocking type writing instrument 100, and the lower side is the rear side of the knocking type writing instrument 100. In FIG. 34, since the front end of the knock type writing instrument 100 is downward, gravity acts upward in the figure.

  In the writing state of the knock type writing instrument 100, the inner cam 132 is engaged with the outer cam 111, whereby the writing state is maintained. That is, the inclined surface 134 and the vertical wall surface 135 of the cam receiving surface 133 of the inner cam 132 are engaged with the inclined surface 113 and the vertical wall surface 114 of the protrusion 112 of the outer cam 111, thereby restricting the backward movement and rotation of the main rotor 130. Has been. At this time, the speed reduction cam surface 137 of the main rotor 130 and the second speed reduction cam receiving surface 144 of the speed reduction rotor 140 are engaged with each other. Moreover, although mentioned later for details, since the front end of the knock type writing instrument 100 is facing downward, the knock clock member 150 moves forward and is not locked to the locking portion 160. That is, the movement of the operation unit 120 is not restricted, and a knock operation can be performed.

  FIG. 35 is a schematic diagram showing switching from the writing state to the non-writing state of the knock type writing instrument 100 of FIG. The main rotor 130 is given a rotational force by the cam mechanism of the V-shaped cam surface 125 of the operation unit 120 and the cam receiving surface 133 of the main rotor 130 described above, and moves from left to right in the figure every time the knocking operation is performed. . The schematic diagram of FIG. 35 is shown in FIG. 34 except that the speed reduction cam surface 137 of the main rotor 130 and the second speed reduction cam receiving surface 144 of the speed reduction rotor 140 are shifted downward in the drawing for convenience. This is the same as the schematic diagram.

  FIG. 35A is a schematic diagram showing the knocking writing instrument 100 in the writing state and the front end facing upward, and is the state of the knocking writing instrument 100 shown in FIG. The deceleration cam surface 137 of the main rotor 130 and the second deceleration cam receiving surface 144 of the deceleration rotor 140 mesh with each other. The difference from the state of the knock clock member 150 shown in FIG. 34 is the position of the knock clock member 150. That is, in FIG. 35A, since the front end of the knock type writing instrument 100 is upward, gravity acts downward in the figure.

  By turning the front end of the knocking writing instrument 100 upward, the knocking member 150 moves rearward and comes into contact with the operation unit 120. As described above, the knock lock member 150 receives the circumferential force due to its own weight and rotates around the central axis. That is, the lock cam surface 122 of the operation unit 120 and the lock cam receiving surface 151 of the knock clock member 150 cooperate to rotate the knock clock member 150 around the central axis. As a result of the rotation, the knock lock member 150 is locked with the locking portion 160, and the operation portion 120 is prevented from moving forward.

  Specifically, the second protrusion 161 of the locking part 160 is accommodated in the recess 154 of the first protrusion 152 of the knocking member 150, so that the knocking member 150 and the locking part 160 are locked. It becomes a state. In other words, in the writing state, the recess 154 is the second of the locking portion 160 so that the second protrusion 161 of the locking portion 160 is accommodated in the recess 154 of the first protrusion 152 of the knocker member 150. The protrusion 161 is configured to have a complementary shape. Therefore, the slope 162 of the second protrusion 161 has the same inclination as the slope 156 of the recess 154. In this state, even if the operation unit 120 is strongly pressed and moved forward, the component force in the direction in which the second protrusion 161 of the locking unit 160 is accommodated in the recess 154 of the knocker member 150 is increased. However, the locked state is not released.

  FIG. 35B is a schematic diagram showing the knocking writing instrument 100 in a writing state with the front end facing downward, and is a schematic diagram of the knocking writing instrument 100 shown in FIG. Therefore, gravity acts upward in the figure. By turning the front end of the knocking writing instrument 100 downward, the knocking member 150 becomes free in relation to the operation unit 120. On the other hand, the knock lock member 150 presses the locking portion 160 via the first protrusion 152 by its own weight. That is, due to the dead weight of the knock clock member 150, the slope 156 of the recess 154 of the first protrusion 152 receives a circumferential force from the slope 162 of the second protrusion 161 of the locking part 160. As a result, the knock clock member 150 rotates around the central axis opposite to that in the case of FIG. 35A, and the second protrusion 161 is guided into the guide groove 153. That is, the locked state between the knock clock member 150 and the locking portion 160 is released, and the operation portion 120 can move forward. The forward movement of the knock lock member 150 is stopped by contacting the rear end surface of the front shaft 102a.

  FIG. 35C is a schematic diagram showing a state in which the knocking writing instrument 100 is transitioning to the non-writing state and the front end faces downward. Therefore, gravity acts upward in the figure. When the operation unit 120 is pressed against the urging force of the spring 4 and the urging spring 190 and the operation unit 120 is moved forward, the V-shaped cam surface 125 of the operation unit 120 becomes the cam receiving surface of the main rotor 130. The main rotor 130 and the decelerating rotor 140 are moved forward by contacting the inclined surface 134 of 133. Accordingly, the rear end portion of the vertical wall surface 135 of the cam receiving surface 133 of the inner cam 132 exceeds the front end portion of the projection 112 of the outer cam 111 in the front-rear direction. At this time, the inclined surface 134 of the cam receiving surface 133 of the main rotor 130 and the inclined surface 113 of the outer cam 111 coincide with each other, and the rotation around the central axis of the main rotor 130 is performed by the vertical wall surface 114 of the protrusion 112 of the outer cam 111. Will be lifted. The deceleration cam surface 137 of the main rotor 130 and the second deceleration cam receiving surface 144 of the deceleration rotor 140 mesh with each other.

  When the pressing of the operation unit 120 is released from the state of FIG. 35C, the operation unit 120, the main rotor 130, and the reduction rotor 140 are moved backward by the biasing force of the spring 4. At this time, the rotation of the main rotor 130 around the central axis is not restricted by the vertical wall surface 114 of the protrusion 112 of the outer cam 111. Therefore, the inclined surface 134 of the cam receiving surface 133 of the main rotor 130 presses the inclined surface 113 of the outer cam 111 or the V-shaped cam surface 125 of the operation unit 120 by the biasing force of the spring 4 via the refill 3 and the reduction rotor 140. The main rotor 130 receives a component in the circumferential direction and rotates about the central axis (counterclockwise when the knocking writing instrument 1 is viewed from the front).

  Since the main rotor 130 moves backward while rotating, as shown in FIG. 35 (d), the protrusion 132 a of the inner cam 132 is disposed between the protrusions 112 of the outer cam 111, and the protrusion 112 of the outer cam 111. Are disposed between the protrusions 132 a of the inner cam 132, that is, in the vertical groove 131. As a result, the engagement between the outer cam 111 and the inner cam 132 is released.

  When the operation unit 120, the main rotor 130, and the reduction rotor 140 are integrally retreated from the state of FIG. 35D, the knock-type writing instrument 100 immediately before the end of switching to the non-writing state, that is, refilling. As shown in FIG. 35 (e), the slope of the first reduction cam receiving surface 141 of the reduction rotator 140 immediately before stopping the backward movement of the refill 3 during the backward movement of 142 abuts against the slope 113 of the outer cam 111.

  In the state of FIG. 35 (e), when the inclined surface 142 of the first deceleration cam receiving surface 141 of the deceleration rotor 140 presses the inclined surface 113 of the outer cam 111 by the urging force of the spring 4 through the refill 3, the deceleration rotor 140. Rotates around the central axis in response to the circumferential force. That is, the inclined surface 113 of the outer cam 111 rotates the reduction rotor 140 around the central axis in cooperation with the first reduction cam receiving surface 141 of the reduction rotor 140 during the rearward movement of the refill 3. In other words, the slope 142 of the first deceleration cam receiving surface 141 of the reduction rotor 140 slides against the slope of the slope 113 of the outer cam 111. That is, the reduction rotor 140 rotates while the first reduction cam receiving surface 141 acts on the outer cam 111 and the reduction rotor 140 moves backward while the refill 3 is moving backward. Simultaneously with this sliding, the slope 145 of the second deceleration cam receiving surface 144 of the deceleration rotor 140 slides against the slope 138 of the deceleration cam surface 137 of the main rotor 130, and the deceleration cam surface of the main rotor 130. The meshing between 137 and the second reduction cam receiving surface 144 of the reduction rotor 140 is released.

  The rotation of the reduction rotor 140 stops when the vertical wall surface 143 of the first deceleration cam receiving surface 141 collides with the vertical wall surface 114 of the protrusion 112 of the outer cam 111. The rotational direction of the reduction rotor 140 is the same as the rotational direction of the main rotor 130.

  FIG. 35 (f) is a schematic diagram illustrating a state in which the rotation of the reduction rotor 140 is stopped and the switching to the non-writing state is completed, that is, a state in which the backward movement of the refill 3 is stopped. It is a schematic diagram of the state of the shown knock-type writing instrument 100. FIG. At this time, the inclined surface 142 and the vertical wall surface 143 of the first deceleration cam receiving surface 141 are engaged with the inclined surface 113 and the vertical wall surface 114 of the protrusion 112 of the outer cam 111, thereby restricting the backward movement and rotation of the reduction rotor 140. Has been. Therefore, the backward movement of the operation unit 120 and the main rotor 130 is similarly restricted. Since the operation unit 120, the main rotor 130, and the reduction rotor 140 are prevented from moving backward, the refill 3 is also prevented from moving backward. As a result, the non-writing state of the knock type writing instrument 100 is maintained.

  From the writing state of the knock-type writing instrument 100 shown in FIG. 35A until the slope 142 of the reduction rotor 140 contacts the slope 113 of the outer cam 111 as shown in FIG. The deceleration cam surface 137 of the rotor 130 and the second deceleration cam receiving surface 144 of the deceleration rotor 140 mesh with each other. On the other hand, as described above, the reduction rotator 140 rotates while the refill 3 moves backward, whereby the reduction cam surface 137 of the main rotor 130 and the second reduction cam receiving surface 144 of the reduction rotator 140 The meshing is released.

  The rotation of the reduction rotor 140, in other words, the slide of the slope 142 of the first reduction cam receiving surface 141 of the reduction rotor 140 with respect to the slope 113 of the outer cam 111, and the slope 138 of the reduction cam surface 137 of the main rotor 130 The sliding of the slope 145 of the second deceleration cam receiving surface 144 of the reduction rotor 140 is performed against the frictional resistance between these slopes. That is, when the refill 3 is switched to the non-writing state, the refill 3 moves vigorously backward by the urging force of the spring 4, but part of the kinetic energy is reduced when the refill 3 moves backward. It is converted into frictional heat generated by the kinetic energy by the rotation of the above and the slide of the slope described above. As a result, the impact applied when the refill 3 is stopped is reduced and mitigated by the amount of kinetic energy due to rotation and the kinetic energy converted into frictional heat.

  Ink back that occurs as a result of the impact applied to the refill 3 is particularly likely to be caused by an impact in the front-rear direction applied by stopping the refill 3, but the occurrence of ink back can be suppressed by simultaneously applying impact in a different direction. Can do. Specifically, an impact when stopping the rotation of the reduction rotor 140, that is, when the vertical wall surface 143 of the first deceleration cam receiving surface 141 collides with the vertical wall surface 114 of the projection 112 of the outer cam 111 in the circumferential direction. The impact of can be used.

  Furthermore, a closed space, that is, a substantially sealed space, is defined by the main rotor 130 and the reduction rotor 140. Specifically, a space S <b> 2 is defined between the inner peripheral surface of the hole 136 of the main rotor 130 and the medium diameter part 140 b and the small diameter part 140 c of the reduction rotor 140 inserted into the hole 136. As described above, the rotation of the reduction rotor 140 with respect to the main rotor 130 and the reduction cam surface 137 of the main rotor 130 and the second reduction cam receiving surface 144 of the reduction rotor 140 due to the rotation of the reduction rotor 140. Due to the change in meshing, the volume of the space S2 is changed, that is, compressed and expanded. Due to the change in the volume of the space S2, the internal pressure changes in a complicated manner, thereby causing a damper effect that reduces the moving speed of the refill 3 during the rearward movement of the refill 3. As a result, the impact applied when the refill 3 is stopped can be reduced.

  As described above, the knock type writing instrument 100 includes the biasing spring 190 having one end supported by the main rotor 130 inside the hollow fitting portion 126 of the operation unit 120. Similarly, there is an effect of reducing the impact applied when the refill 3 is stopped.

  FIG. 36 is a schematic diagram showing switching from the non-writing state to the writing state of the knock-type writing instrument 100 of FIG. The schematic diagram of FIG. 36 is a schematic diagram similar to FIG. 35, in which the upper side is the front side of the knock type writing instrument 100 and the lower side is the rear side of the knock type writing instrument 100.

  FIG. 36 (a) is a schematic diagram showing the knocking writing instrument 100 in a non-writing state and a front end facing upward, and is a schematic diagram of the state of the knocking writing instrument 100 shown in FIG. The deceleration cam surface 137 of the main rotor 130 and the second deceleration cam receiving surface 144 of the deceleration rotor 140 are not meshed as described above with reference to FIGS. 35 (e) and 35 (f). Gravity acts downward in the figure. Therefore, as described above with reference to FIG. 35A, the knock clock member 150 is locked with the locking portion 160, and the operation portion 120 is prevented from moving forward. That is, the schematic diagram of FIG. 36A is the same as the schematic diagram of FIG. 35F except that the knock clock member 150 is locked to the locking portion 160.

  FIG. 36B is a schematic diagram showing the knocking writing instrument 100 in the non-writing state and the front end facing downward, and is a schematic diagram of the state of the knocking writing instrument 100 shown in FIG. 16. Therefore, gravity acts upward in the figure. By turning the front end of the knock-type writing instrument 100 downward, as described above with reference to FIG. 35B, the locked state of the knock clock member 150 and the locking portion 160 is released, and the front of the operation portion 120 is released. It becomes possible to move to.

  FIG. 36C is a schematic diagram showing a state in which the knocking writing instrument 100 is transitioning to the writing state and the front end faces downward. Therefore, gravity acts upward in the figure. When the operation unit 120 is pressed against the urging force of the spring 4 and the urging spring 190 and the operation unit 120, the main rotor 130, and the reduction rotor 140 are moved forward, the reduction rotor 140 is moved around the central axis. Rotate. That is, before the operation unit 120 is pressed, the deceleration cam surface 137 of the main rotor 130 and the second deceleration cam receiving surface 144 of the deceleration rotor 140 are not meshed, that is, out of phase. The second deceleration cam receiving surface 144 of the child 140 receives a circumferential component force from the deceleration cam surface 137 of the main rotor 130. As a result, the speed reduction rotor 140 has a direction opposite to the direction described above with reference to FIG. 35 (e), that is, the speed reduction cam surface 137 of the main rotor 130 and the second speed reduction cam receiving surface 144 of the speed reduction rotor 140. The reduction rotator 140 rotates around the central axis in the direction in which the two mesh with each other.

  When the operation unit 120 is further pressed from this state, the rear end portion of the vertical wall surface 135 of the cam receiving surface 133 of the inner cam 132 exceeds the front end portion of the projection 112 of the outer cam 111 in the front-rear direction. At this time, the inclined surface 134 of the cam receiving surface 133 of the main rotor 130 and the inclined surface 113 of the outer cam 111 coincide with each other, and the rotation around the central axis of the main rotor 130 is performed by the vertical wall surface 114 of the protrusion 112 of the outer cam 111. Will be lifted.

  When the pressing of the operation unit 120 is released from the state of FIG. 36C, the operation unit 120, the main rotor 130, and the reduction rotor 140 are moved backward by the biasing force of the spring 4. At this time, the rotation of the main rotor 130 around the central axis is not restricted by the vertical wall surface 114 of the protrusion 112 of the outer cam 111. Therefore, the inclined surface 134 of the cam receiving surface 133 of the main rotor 130 presses the inclined surface 113 of the outer cam 111 or the V-shaped cam surface 125 of the operation unit 120 by the biasing force of the spring 4 via the refill 3 and the reduction rotor 140. The main rotor 130 receives a component in the circumferential direction and rotates about the central axis (counterclockwise when the knocking writing instrument 1 is viewed from the front). That is, the inner cam 132 of the main rotor 130 moves along the slope of the slope 113 of the outer cam 111. As a result, the inner cam 132 of the main rotor 130 is engaged with the outer cam 111, whereby the writing state is maintained (FIG. 36 (d)). The operation unit 120 is retracted by the urging force of the urging spring 190 and returns to the original position (FIG. 36E).

  In the embodiment described above, the combination of the outer cam and the first reduction cam receiving surface of the reduction rotor that cooperate with each other, and the reduction cam surface of the main rotor and the second reduction cam receiving surface of the reduction rotor that cooperate with each other. However, it is also possible to have only one of the combinations. Further, the corresponding shapes of the outer cam and the first deceleration cam receiving surface of the reduction rotor, and the corresponding shapes of the reduction cam surface of the main rotor and the second reduction cam receiving surface of the reduction rotor, As long as the reduction rotor can be rotated in cooperation with each other during the rearward movement of the refill, it can be arbitrarily adopted.

  Furthermore, you may apply the structure by embodiment mentioned above to another type of knock type writing instrument. For example, the main rotor described above is switched between the writing state and the non-writing state by engaging with or disengaging from the outer cam provided on the shaft cylinder. You may make it engage or disengage with the outer cam provided in the member. Moreover, although the main rotor which is an engaging member mentioned above rotated according to knock operation, it replaces with this, engages with the outer cam provided in the axial cylinder using the non-rotating engaging member, or The writing state and the non-writing state may be switched by releasing the engagement. In summary, the present invention is applicable to a knock-type writing instrument in which the writing state and the non-writing state are switched by engaging or releasing the engaging member with the outer cam provided on the shaft cylinder side. Furthermore, the present invention is also applicable to a knock-type writing instrument that can be switched to a non-writing state by pressing a release portion that is different from the operation portion. Another release portion is, for example, a release button provided on the outer peripheral surface of the shaft tube.

  Further, in the above-described embodiment, the reduction rotor is rotated around the central axis in cooperation with the outer cam as the first cam surface. That is, the engaging portion that engages with or disengages from the main rotor and the first cam surface that rotates the reduction rotor are the same, but they may be provided separately. In this case, either one or both of the engaging portion and the first cam surface may be provided on the shaft tube side, that is, on the inner surface of the shaft tube, or may be provided on a separate member attached to the shaft tube.

  Since the knocking writing instrument 100 has the knocking member 150, the forward movement of the operation unit 120 is prevented in the writing state and the front end is in the upward state, and the knocking operation cannot be performed. Therefore, when the handwriting is erased by the knocking writing instrument 100 using the erasing member 170, a stable rubbing operation can be performed. That is, even if the knocking writing instrument 100 is changed and the erasing member 170 is pressed against the writing surface to perform a rubbing operation, the erasing member 170 will not rattle.

  The knock clock member 150 may have any shape as long as it can move in the longitudinal direction in the shaft cylinder 102 by gravity. The number of the first protrusions 152 of the knock lock member 150 and the number of the second protrusions 161 of the corresponding locking part 160 may be the same or different, and can be arbitrarily set. There may be one each, or two or more. In addition, the shape of the recesses of the second protrusions 161 of the first protrusions 152 of the knocker member 150 and the corresponding locking parts 160 may be any shapes as long as they are not complementary but can be locked together. Can be adopted.

  In summary, the knock-type writing instrument 100 includes the shaft cylinder 102, the operation unit 120, and the main rotor 130, and performs a knock operation that presses the operation unit 120 forward. Can be switched between a writing state and a non-writing state, and is provided on the inner surface of the shaft tube 102 and can be engaged with the knocking member 150 by being moved in the longitudinal direction in the shaft tube 102 by gravity. When the front end of the shaft tube 102 is directed upward, the knock lock member 150 moves backward to engage with the engagement portion 160, and the operation portion 120 moves forward. Is blocked.

  The knock lock member 150 may be a cylindrical member. When the operation portion 120 has a lock cam surface 122 facing the knock clock member 150, the knock clock member 150 has a lock cam receiving surface 151 cooperating with the lock cam surface 122, and when the knock clock member 150 moves rearward, the lock cam surface 122 and the lock cam receiving surface 151 may cooperate to rotate the knock clock member 150 around the central axis, so that the knock clock member 150 and the locking portion 160 are locked. The operation unit 120 may have a lock cam surface 122 that faces the knock clock member 150, and the main rotor 130 may be disposed in the operation unit 120. The knock clock member 150 has the first protrusion 152 and the locking portion 160 has the second protrusion 161. When the knock clock member 150 rotates about the central axis, the first protrusion 152 and the second protrusion The two second protrusions 161 may be locked so that the knock clock member 150 and the locking portion 160 are locked. All or part of the operation unit 120 may be the erasing member 170 capable of erasing the handwriting of the knock type writing instrument 100. A recess is formed in the side surface of the first protrusion 152 or the second second protrusion 161 so that the first protrusion 152 and the second second protrusion 161 are locked by the recess. Also good. The plurality of first protrusions 152 and the plurality of second second protrusions 161 are arranged at equal intervals along the circumferential direction, and one of the first protrusions 152 or the second second protrusions 161. A guide groove extending in the front-rear direction may be defined between the protrusions, and the other protrusion may be moved in the guide groove in accordance with the movement of the knock clock member 150 in the front-rear direction. You may make it a recessed part have a slope which guides the protrusion part to latch into a guide groove.

  The refill 3 in the above-described embodiment may contain a thermochromic ink containing a thermochromic color material. In this case, the knock-type writing instrument is a knock-type thermochromic writing instrument, and the handwriting of the knock-type writing instrument can be thermally discolored by frictional heat generated when it is rubbed by a friction body as an erasing member.

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

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

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

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

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

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

  Specifically, o-cresol, tertiary butyl catechol, nonylphenol, n-octylphenol, n-dodecylphenol, n-stearylphenol, p-chlorophenol, p-bromophenol, o-phenylphenol, hexafluorobisphenol, p N-butyl hydroxybenzoate, n-octyl p-hydroxybenzoate, resorcin, dodecyl gallate, 2,2-bis (4′-hydroxyphenyl) propane, 4,4-dihydroxydiphenyl sulfone, 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) ) Ethyl propionate, 2,2-bis (4′-hydroxyphenyl) -4-methylpentane, 2,2-bis (4′-hydroxyphenyl) hexafluoropropane, 2 2- bis (4'-hydroxyphenyl) n- heptane, 2,2-bis least one such (4'-hydroxyphenyl) n- nonane and the like.

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

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

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

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

  The thermochromic microcapsule pigment is obtained by microencapsulating a thermochromic composition containing at least the leuco dye, the developer, and the color change temperature adjusting agent so that the average particle diameter is 0.2 to 3 μm. Can be manufactured. Examples of the microencapsulation method include interfacial polymerization method, interfacial polycondensation method, in situ polymerization method, liquid curing coating method, phase separation method from aqueous solution, phase separation method from organic solvent, melt dispersion cooling method, air A suspension coating method, a spray drying method, etc. can be mentioned, and can be appropriately selected according to the application.

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

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

  The thermochromic microcapsule pigment is a combination of the above-described leuco dye, color developer, and color change temperature adjusting agent, and the amount, color development temperature of each color (for example, color development at 0 ° C. or higher), decolorization temperature ( For example, it is possible to set the color erasing at 50 ° C. or higher) to a suitable temperature, and it is preferable that the color changes from colored to colorless by heat such as frictional heat.

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

  The average particle size of the thermochromic microcapsule pigment is low in color, color developability, easy decoloring, stability, fluidity in ink, and adverse effects on writing properties. From the viewpoint of compatibility with the microcapsule pigment, it is preferably 0.2 to 5 μm, and more preferably 0.3 to 3 μm. The “average particle diameter” defined here is a value obtained by measuring the average particle diameter (50% diameter) with a particle size analyzer [Microtrac HRA9320-X100 (Nikkiso Co., Ltd.)] (refractive index 1.8). It is.

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

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

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

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

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

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

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

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

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

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

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

  In the refill, an ink follower may be disposed immediately behind the ink. The material constituting the follower can be composed of at least a non-volatile or hardly volatile organic solvent and a thickener. The non-volatile or hardly volatile organic solvent used for the ink follower is used as a base oil for the ink follower, and for example, liquid paraffin is used. 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 mineral oils that can be used include, for example, commercially available Diana Process Oil NS-100, PW-32, PW-90, NR-68, AH-58 (manufactured by Idemitsu Kosan Co., Ltd.).

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

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

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

  These nonvolatile or hardly 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 phosphate phosphate, fine particle silica, polystyrene-polyethylene / butylene rubber-polystyrene block copolymer, polystyrene-polyethylene / propylene rubber-polystyrene block copolymer, and hydrogenated styrene. -Butadiene rubber, block copolymer of styrene-ethylenebutylene-olefin crystal, block copolymer of olefin crystal-ethylenebutylene-olefin crystal, acetoalkoxyaluminum dialchelate, and the like can be used, and these can be used alone or in combination.

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

  Examples of a commercially available block copolymer of polystyrene-polyethylene / butylene rubber-polystyrene include Kraton GFG-1901X, Kraton GG-1650 (manufactured by Shell Japan), Septon 8007, Septon 8004 (manufactured by Kuraray), and the like. Is mentioned. Furthermore, as a preferable commercial item of the block copolymer of polystyrene-polyethylene / propylene rubber-polystyrene, Kraton GG-1730 (manufactured by Shell Japan Co., Ltd.), Septon 2006, Septon 2063 (manufactured by Kuraray Co., Ltd.) and the like can be mentioned.

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

  DYNARON 4600P (manufactured by JSR) and the like are mentioned as preferred commercial products of the block copolymer of styrene-ethylene butylene-olefin crystals, and DYNARON 6200P and DYNARON 6201B (the preferred commercial products of block copolymers of olefin crystal-ethylene butylene-olefin crystals are JSR) and the like.

  Plenact AL-M (manufactured by Ajinomoto Fine-Techno Co., Ltd.) and the like are preferable as a commercially available product of acetoalkoxy aluminum dial chelate.

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

  In the present invention, from the viewpoint of obtaining an ink follower that prevents the occurrence of ink back, the average value of tan δ values measured for each frequency while increasing exponentially in the frequency range of 1 to 63 rad / s is 1.0. The above is preferable, and 1.7 to 3.4 is more preferable.

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

  Rubber elastic materials such as thermosetting rubber such as silicone rubber, nitrile rubber, ethylene propylene rubber, ethylene propylene diene rubber, and thermoplastic elastomer such as styrene elastomer, olefin elastomer, polyester elastomer, etc. A mixture of two or more rubber elastic materials and a mixture of a rubber elastic material and a synthetic resin can be used. This is a wear test (ASTM D1044) defined in JIS K7204 and a load of 9.8 N, 1000 rpm environment. Below, it comprises so that the Taber abrasion amount in the abrasion wheel CS-17 of a Taber abrasion tester may be 10 mg or more, and a friction body is formed. Furthermore, in order to adjust the Taber abrasion amount to 10 mg or more, alkylsulfonic acid phenyl ester, cyclohexanedicarboxylic acid ester and phthalic acid plasticizer are added to the friction material to give more flexibility. May be. Because the friction body contains alkyl sulfonic acid phenyl ester, cyclohexane dicarboxylic acid ester and phthalic acid plasticizer, the friction body is more easily worn, so that the handwriting is not damaged and the printed characters are not distorted. Can be deleted. Furthermore, the friction body preferably has a durometer D hardness of 30 or more as defined in JIS K6203. Thereby, a predetermined hardness can be ensured and a more stable rubbing operation can be achieved. The friction body can also be applied as a touch pen or a stylus pen.

DESCRIPTION OF SYMBOLS 1 Knock type writing instrument 2 Shaft cylinder 3 Refill 4 Spring 10 Inner cylinder 11 Outer cam 13 Slope 20 Operation part 21 Projection part 22 Cam surface 30 Main rotor 32 Inner cam 33 Cam receiving surface 37 Deceleration cam surface 40 Deceleration rotor 41 1st Deceleration cam receiving surface 44 Second deceleration cam receiving surface

Claims (8)

A shaft cylinder, a writing body arranged in the shaft cylinder, an elastic member that urges the writing body to the rear, and an operation that is pushed forward against the urging force of the elastic member during a knocking operation A knock type that is switched between a writing state and a non-writing state when the engaging member engages with or disengages from an engaging portion provided on the shaft tube side. A writing instrument,
A reduction rotor that moves in the front-rear direction together with the cursive body
A knock type writing instrument, further comprising: a first cam surface that rotates the reduction rotator about a central axis in cooperation with the reduction rotator during the backward movement of the writing body.   The knock type writing instrument according to claim 1, wherein the engagement member rotates around a central axis in accordance with a knocking operation to switch between a writing state and a non-writing state.   The first cam surface is formed on the inner surface on the shaft tube side, and the reduction rotor has a first cam receiving surface that cooperates with the first cam surface, and the writing body moves during the backward movement. 3. The knock type writing instrument according to claim 1, wherein the first cam receiving surface acts on the first cam surface to rotate the deceleration rotor while moving backward. 4.   The engaging member has a second cam surface, the speed reduction rotor has a second cam receiving surface that cooperates with the second cam surface, and the second cam during the backward movement of the writing body The knock type writing instrument according to claim 3, wherein the receiving surface slides with respect to the second cam surface.   The knock type writing instrument according to claim 4, wherein the first cam receiving surface and the corresponding second cam receiving surface have inclined surfaces inclined in opposite directions.   The knock type writing instrument according to any one of claims 1 to 5, wherein the rotation of the decelerating rotor is stopped by a collision with a regulating surface provided on an inner surface of the shaft cylinder side.    The knock type writing instrument according to any one of claims 1 to 6, wherein the first cam surface and the engaging portion are the same.   The closed space is defined by the engagement member and the reduction rotor, and the volume of the space changes during the backward movement of the cursive body. The knock type writing instrument according to one item.

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