JP5943343B2 - Knock-type writing instrument - Google Patents

Description

  The present invention relates to a writing instrument in which another article such as a touch pen is attached to a rear end portion of a shaft.

In recent years, with the spread of smartphones and tablet PCs, so-called stylus pens such as capacitive touch pens have been widely used. At the same time, there are increasing opportunities to write notes such as taking notes on paper while using smartphones and tablet PCs.
On the other hand, writing instruments equipped with a heat erasable ink are also widely used, and an increasing number of writing instruments have a friction body formed of a thermoplastic elastomer or the like attached to a rear end or a cap. Currently, the following patent documents are disclosed as a mechanism for mounting a member other than the cursive body on the rear end of the shaft of the writing instrument.

JP 2011-178153 A JP 2006-88631 A JP 2006-56149 A

In the prior art document 1, since there is no cover for protecting the member attached to the rear end portion of the shaft, there is a problem that the rear end member is damaged or dirty when it is carried.
In the above-mentioned prior art document 2, the stylus pen coupled to the rear end side of the shaft can be freely moved in and out, but in this case, it is necessary to perform the rotation operation with the other hand while holding the shaft with one hand. The problem is that it is difficult to operate with one hand.
In the prior art document 3, it is possible to open and close the lid at the rear end by one hand operation, but there is a problem that the number of parts increases.

  In view of the above-described problems of the prior art, an object of the present invention is to provide a writing instrument in which a member attached to the rear end can be easily moved in and out by a knocking operation performed with one hand.

In view of the above problems, the present invention provides:
Shaft cylinder 17,
A writing tip 13a capable of appearing and retracting from the tip of the shaft tube 17, and
A rear end appendage 20 attached to the rear end of the shaft cylinder 17, and
A knock mechanism involved in the appearance of the writing tip 13a by a reciprocating movement in the front-rear direction by a knock operation;
A knock-type writing instrument 1 comprising a rear end covering member 16 that reciprocates in the front-rear direction between the state of covering and exposing the rear end appendage 20 in conjunction with the knock mechanism,
The knock mechanism is formed so as to be able to be locked at an intermediate position located between a rearmost position and a most advanced position in the range of the reciprocating movement,
In the state where the knock mechanism is at the rearmost end position, the writing tip 13a is immersed in the shaft cylinder 17 and the rear end appendage 20 is covered by the rear end covering member 16,
In a state where the knock mechanism is locked at the intermediate position by a knock operation, the writing tip 13a is immersed in the shaft tube 17, while the rear end appendage 20 is at the rear end of the shaft tube 17. Exposed,
When the knock mechanism is in the most advanced position by the knocking operation, the writing tip 13a protrudes from the tip of the shaft tube 17, and the rear end appendage 20 is exposed at the rear end of the shaft tube 17. It is characterized by.

In the present invention, the side where the writing tip 13a is located is referred to as “tip side”, and the opposite side is referred to as “rear end side”.
The “rear end accessory 20” in the present invention is a member used for purposes other than writing, and is attached to the rear end depending on the purpose of the writing instrument. For example, a stylus pen for touch panel operation, a ballpoint pen that uses heat-erasable writing ink, an eraser made of thermoplastic elastomer, or an eraser when the writing tip is a mechanical pencil . It is also possible to attach the seal as a rear end accessory to the rear end of the writing instrument.

In the knock type writing instrument 1 according to the present invention, the writing tip 13a can be moved up and down and the rear end appendage 20 can be moved up and down by operating the same knocking mechanism. That is, the knock mechanism is an intermediate between the state where neither the writing tip 13a nor the rear end appendage 20 is exposed (immersion state) and the state where both of them are exposed (second exposure state). In this state, the writing tip 13a is not exposed but the rear end appendage 20 is exposed (first exposed state). This prevents the surroundings from being soiled by the writing tip 13a when only the rear end appendage 20 is used.
Here, the knock mechanism can be formed as a knock button that is used in a normal knock ballpoint pen. Moreover, it is also possible to form as what is provided with the slide type knock lever provided in the side surface of a shaft cylinder.

The knock type writing instrument 1 according to the present invention, in addition to the above configuration,
A cam groove 30 is formed on the inner surface of the rear end of the shaft cylinder 17,
The knock mechanism is
A rotor 14 housed in the shaft cylinder 17 and movable in the front-rear direction along with the operation of the knock mechanism and rotating in the circumferential direction along the cam groove 30;
An engagement cam 14a that is formed as a longitudinal protrusion on the outer periphery of the rotor 14 and that engages with the cam groove 30;
A first locking portion 31, a second locking portion 32, and a third locking portion 33 with which the engaging cam 14a engages with the cam groove 30 so as not to rotate in the reverse direction are arranged along the rotation direction of the rotor 14. In this order,
The first locking portion 31 is provided at the rearmost position,
The second locking portion 32 is provided at the intermediate position,
The third locking portion 33 is provided at the most advanced position,
In the state where the engagement cam 14a is locked to the first locking portion 31, the knock mechanism is operated in the state where the engagement cam 14a is locked to the first locking portion 31. In the end position,
In a state where the engagement cam 14a is locked to the second locking portion 32, the knock mechanism is in the intermediate position,
In the state where the engagement cam 14a is locked to the third locking portion 33, the knock mechanism is preferably formed so as to be in the most advanced position.

The “cam groove 30” is a groove provided as a multistage cam capable of realizing the above-described three-stage locking state. For example, the cam groove 30 can be formed by forming a part of the thickness of the rear end portion of the shaft cylinder 17 and forming a portion other than the large portion substantially as a groove. Further, by inserting a cylindrical member notched in the shape of such a groove into the rear end portion of the shaft cylinder 17, this notched portion can also function as the cam groove 30.
The “rotor 14” provided in the knock mechanism is a member that rotates in the circumferential direction while moving in the front-rear direction when pressed by a configuration like a knock bar 15 provided in the knock mechanism. With this rotation, the “engaging cam 14a” formed on the rotor 14 moves in the order of the first locking portion 31, the second locking portion 32, and the third locking portion 33 in the cam groove 30. It is to be locked in place.

When the engagement cam 14a is locked to the first locking portion 31, the knock mechanism is at the rearmost position, the writing tip 13a is immersed in the shaft tube 17, and the rear end appendage 20 Is covered with a rear end covering member 19.
In this state, when the rotor 14 rotates and the engagement cam 14a moves to the second locking portion 32 and locks there, the knock mechanism is in the intermediate position, and the writing tip 13a is the shaft cylinder. On the other hand, the rear end appendage 20 is exposed at the rear end of the shaft tube 17 while being immersed in the shaft 17.
When the rotor 20 further rotates from this state and the engagement cam 14a moves to the third locking portion 33 and is locked there, the knock mechanism is at the foremost position, and the shaft cylinder 17 The writing tip 13a protrudes from the tip, and the rear end appendage 20 is exposed at the rear end of the shaft tube 17.

When the rotor 14 further rotates from this state, the engagement cam 14a again moves to the first locking portion 31 and is locked there, and the knock mechanism returns to the end position, and the writing tip 13a. And the rear end appendage 20 are covered with the rear end covering member 19. In order to bias the return of the knock mechanism to the rearmost position at this time, the knock mechanism preferably includes a spring 12.
In the present invention, in addition to the above configuration, the rear end appendage 20 is a touch pen 20, and a region near the rear end of the surface of the shaft cylinder 17 has conductivity to be electrically connected to the touch pen 20. It is desirable to do. With this configuration, if the conductive region is grasped with a finger, a conductive path from the finger to the touch pen 20 is secured, and the touch pen 20 is used as a stylus pen for operating a capacitive touch panel. It can be used.

  Since the present invention is formed as described above, a rear end covering member as a protective cover is provided on a rear end accessory such as a stylus pen that is coupled to the rear end side of the shaft tube. The object of the rear end and the writing tip of the writing tube from the tip of the shaft tube can be easily moved by the operation of one hand without the object becoming dirty. It is also possible to select exposure of only the rear end appendage and exposure of both the writing front end and rear end appendage depending on the strength at the time of knocking.

The immersion state (A), the 1st exposure state (B), and the 2nd exposure state (C) in the knock type writing instrument concerning one embodiment of the present invention are shown with a perspective view. The knock type writing instrument concerning one embodiment of the present invention is shown with an exploded perspective view. The shaft cylinder used in one embodiment of the present invention is shown in the perspective view along the longitudinal direction from various angles. It is a schematic diagram for demonstrating the immersion state in knock operation of the knock type writing instrument which concerns on 1 embodiment of this invention. The rotor used by one embodiment of the present invention is shown with a perspective view. The knock bar used in one embodiment of the present invention is shown in a perspective view (A) and a cross-sectional view (B) along the longitudinal direction. The immersion state in the knock type writing instrument which concerns on one Embodiment of this invention is shown with side surface sectional drawing. It is a schematic diagram for demonstrating the 1st exposure state in knock operation of the knock type writing instrument which concerns on 1 embodiment of this invention. The 1st exposure state in the knock type writing instrument concerning one embodiment of the present invention is shown with a side sectional view. It is a schematic diagram for demonstrating the 2nd exposure state in knock operation of the knock type writing instrument which concerns on 1 embodiment of this invention. The 2nd exposure state in the knock type writing instrument concerning one embodiment of the present invention is shown with a side sectional view. It is a schematic diagram for demonstrating the return from the 2nd exposure state to an immersion state in knock operation of the knock type writing instrument which concerns on 1 embodiment of this invention.

An embodiment of the present invention will be described with reference to the drawings.
The knock-type writing instrument 1 according to one embodiment of the present invention includes a ballpoint pen refill 13 as a writing instrument and a capacitive touch pen 20 as a rear end accessory 20.
The knock-type writing instrument 1 has an appearance as shown in FIG. 1A when the ball pen tip 13a as the writing tip 13a and the touch pen 20 are not exposed. An outer cylinder 18 which is a sleeve covering the outside of the shaft cylinder 17 (see FIG. 2) is made of stainless steel and has conductivity, and a guide slit 18a is provided at a rear end portion of the outer cylinder 18. Further, a knock cover 16 as a rear end covering member 16 is provided so as to cover the rear end side of the outer cylinder 18. The knock cover 16 is provided with a knock projection 16a for exposing the cursive body to the outside. In the state of FIG. 1A, the knock cover 16 maintains the rear end position.

When the knocking protrusion 16a is moved forward along the guide slit 18a from this state, the knock cover 16 is temporarily locked at the intermediate position shown in FIG. In this state, the ballpoint pen tip 13a is not yet exposed, but the touch pen 20 is exposed from the rear end of the knock cover 16.
When the knocking protrusion 16a is moved further forward along the guide slit 18a from this state, the knock cover 16 is locked at the most advanced position shown in FIG. In this state, following the state shown in FIG. 1C, the touch pen 20 is exposed from the rear end of the knock cover 16, and the ball-point pen tip 13a is exposed from the front end.

When the knocking protrusion 16a is further pressed along the guide slit 18a from this state, the engagement state shown in FIG. 1C is released and the immersion state shown in FIG. 1A is restored.
FIG. 2 is a perspective view showing each part constituting the rotary feeding type writing instrument 10 according to the embodiment of the present invention. Each part will be described below with reference to the other figures as appropriate, with reference to the figure.
The shaft cylinder 17 is formed in a substantially cylindrical shape by injection molding of polycarbonate resin.
As described above, the outer cylinder 18 is a stainless steel cylindrical member, and is inserted into the shaft cylinder 17. A guide slit 18a through which the knocking protrusion 16a slides is provided at the rear end of the outer cylinder 18.
A stainless-steel touch pen holder 19 is mounted on the rear end of the outer cylinder 18, and a touch pen 20 is mounted therein. The touch pen 20 is formed of a conductive silicone rubber into a cylindrical shape whose tip is formed in a substantially hemispherical shape. The touch pen 20 may be formed with a polyester fiber core in the shape described above, and the surface thereof may be coated with polythiophene, which is a conductive polymer material. Further, the touch pen holder 19 may be formed of a conductive metal such as brass in addition to stainless steel, or may be made of plastic with conductive plating.

  A cam groove 30 is formed near the rear end of the inner peripheral surface of the shaft cylinder 17 as shown in FIG. Specifically, it is injection-molded so that the thickness of a portion near the rear end of the inner peripheral surface of the shaft cylinder 17 is thick, and the portion other than this thick portion (that is, the thickness from the tip is The constant part) is the cam groove 30. The cam groove 30 has a first locking portion which is a locking portion provided on the most rear end side in a clockwise direction (hereinafter, simply referred to as “clockwise direction”) in a plan view as viewed from the rear end side. 31, a second locking portion 32 that is a locking portion positioned next to the locking portion and a third locking portion 33 that is a locking portion provided on the most distal end side are formed. Each of the first locking portion 31, the second locking portion 32, and the third locking portion 33 is formed in a pair with the axis therebetween.

  The shape of the cam groove 30 will be further described in detail with reference to FIG. This figure is a schematic view assuming that the cam groove 30 is seen through from the outside of the shaft cylinder 17 while rotating in the circumferential direction, with the left side in the figure being the front end direction and the right side being the rear end direction. Further, the direction from the bottom to the top in the figure corresponds to the clockwise direction. The first locking portion 31 has an angle formed by a first locking edge 31b formed along the longitudinal direction and a first inclined edge 31a inclined rearward toward the first locking edge 31b. It is formed as. The second locking portion 32 includes a second locking edge 32b formed along the longitudinal direction on the distal end side and the clockwise direction side of the first locking edge 31b, and the second locking edge 32b. It is formed as an angle formed by the second inclined edge 32a that is inclined rearward. Further, the third locking portion 33 includes a third locking edge 33b formed along the longitudinal direction on the distal end side and the clockwise direction side of the second locking edge 32b, and the third locking edge 33b. It is formed as an angle formed by the third inclined edge 33a that is inclined rearwardly. Further, a fourth inclined edge 34 that is inclined rearward is formed between the third locking portion 33 and the first locking portion 31. The behavior of the rotor 14 in these cam grooves 30 will be described later.

The inner cylinder 11 is a member inserted into the distal end side of the shaft cylinder 17, and is formed by injection molding of polycarbonate (see FIG. 2). The ballpoint pen refill 13 penetrates through the axis of the inner cylinder (see FIG. 7). The tip of the spring 12 is in contact with the rear end of the inner cylinder 11. That is, the inner cylinder 11 serves as a spring receiver. The rear end of the spring 12 is in contact with the front end of the rotor 14 and always urges it backward.
The tip shaft 10 is screwed to the tip of the inner cylinder 11 to constitute the most distal portion of the shaft cylinder 17. The ball pen refill 13 penetrates through this axis (see FIG. 7).
The stainless steel ballpoint pen refill 13 for containing ink has a ballpoint pen tip 13a as a writing tip at the tip. The rear end portion of the ballpoint pen refill 13 is inserted into the rotor 14 (see FIG. 7).

A knock mechanism is formed by the rotor 14, the knock bar 15 and the knock cover 16 shown in FIG. This knock mechanism, together with the cam groove 30, constitutes a Kern knock mechanism having a two-stage cam.
The rotor 14 is formed by injection molding of polyacetal. Specifically, as shown in FIG. 5, a cylindrical intermediate portion 14b having an outer diameter that is substantially the same as the inner diameter of the shaft tube 17, and the outer diameter slightly positioned on the distal end side of the intermediate portion 14b. A front end portion 14c, a cam mechanism portion 14d located on the rear end side of the intermediate portion 14b and having a slightly smaller outer diameter, and a rear end side located on the rear end side of the cam mechanism portion 14d. And a rear end portion 14e. On the outer periphery of the cam mechanism portion 14d, a pair of rotor cams 14a as engagement cams 14a formed as ridges along the longitudinal direction are provided with an axis therebetween. At the rear end of the cam mechanism portion 14d, four mountain-shaped tip side rotation projections 14f protrude along the periphery. The rotor cam 14a is provided at an outer peripheral position that coincides with two of the four tip side rotation protrusions 14f that face each other across the axis. The rear end portion 14e is loosely fitted to the tip of the knock bar 15 (see FIG. 7). At the rear end edge of the rear end portion 14e, an engaging portion 14g with a knock bar 15 protruding in an annular shape is formed. This will be described later.

As shown in FIG. 2, the knock bar 15 is a member positioned on the rear end side of the rotor 14, and is formed in a substantially cylindrical shape by injection molding of polycarbonate. As shown in FIG. 6A, at the tip of the knock bar, four mountain-shaped rear end side rotation protrusions 15a protrude along the periphery. The rear end side rotation protrusion 15a has a shape that can be fitted to the front end side rotation protrusion 14f. Further, as shown in FIG. 6B, an engaging portion 15b with the annularly projecting rotor 14 is formed in the vicinity of the tip end of the knock rod inner peripheral surface.
As shown in FIG. 2, the knock cover 16 is a member located on the rear end side of the knock bar 15 and is formed in a substantially cylindrical shape by injection molding of polycarbonate. As described above, a knock projection 16a that protrudes outward is provided on the outer periphery of the front end side of the knock cover 16. The knocking protrusion 16a slides in the front-rear direction along the guide slit 18a of the outer cylinder 18. The rear end portion of the knock bar 15 is press-fitted into the tip of the knock cover 16. An outer cylinder through hole 16b having a C-shaped cross section through which the rear end of the outer cylinder passes is also provided. That is, the outer cylinder 18 is coupled to the touch pen holder 19 in a state of penetrating the knock cover 16 (see FIG. 7). The knock cover 16 is movable in the front-rear direction with respect to the outer cylinder 18 by the outer cylinder through-hole 16b.

Hereinafter, the operation of the knock type writing instrument according to the present embodiment will be described focusing on the behavior of the rotor 14 in the cam groove 30.
In the state shown in the sectional view of FIG. 7, the rotor cam 14 a of the rotor 14 is locked to the first locking portion 31 of the cam groove 30 as shown in FIG. 4. At this time, since the rotor 14 is urged backward by the spring 12, the rotor cam 14a is kept pressed against the first inclined edge 31b, and the ball-point pen tip 13a connected to the rotor 14 is Immerse into the tip 10. Further, since the rotor 14 and the knock bar 15 are engaged with each other by the engaging portions 14g and 15b, the knock cover 16 attached to the rear end of the knock bar 15 covers the touch pen 20. Keep.

Even when the rotor 14 and the knock bar 15 do not have the engaging portions 14g and 15b, the spring 14 is biased backward by the spring 12, so that the movement of the knock bar 15 in the distal direction is not Because it is regulated and movement to the rear end side of the rotor 14 is also regulated by the shaft cylinder 17, the knock cover 16 attached to the rear end of the knock bar 15 covers the touch pen 20 It is possible to keep
That is, in this state, the knock mechanism is at the rearmost position, and the knock type writing instrument 1 is in the immersive state shown in FIG.
When the knocking protrusion 16a is moved in the distal direction from this immersed state, the rear end side rotation protrusion 15a of the knock bar 15 is in contact with the front end side rotation protrusion 14f of the rotor 14, and the biasing force of the spring 12 is applied. It will push against the tip. At this time, the rotor cam 14a slides in the distal direction along the first locking edge 31b. Then, when the second inclined edge 32a is reached, the clockwise rotation is temporarily stopped, and at the same time, the front-end rotation protrusion 14f rotates clockwise by half a pitch and engages with the rear-end rotation protrusion 15a. In this state, the rotor cam 14a is locked with the second locking portion 32 as shown in FIG. In this state, as shown in the cross-sectional view of FIG. 9, the knock cover 16 moves in the distal direction and the touch pen 20 is exposed, but the ball-point pen tip 13 a is still in the front shaft 10. That is, in this state, the knock mechanism is at an intermediate position, and the knock type writing instrument 1 is in the first exposed state shown in FIG. At this time, as shown in FIG. 9, the rotor 14 and the knock bar 15 are engaged with each other by the engaging portions 14g and 15b, and the knock cover 16 moves rearward from the position of the first exposed state. Therefore, the exposure of the touch pen 20 is maintained. As a result, conductivity is secured from the touch pen 20 to the touch pen holder 19, and conductivity is also secured from the touch pen holder 19 to the outer cylinder 18, so that the outer cylinder 18 is held by hand and the touch pen 20 is used as a stylus pen. Touching the capacitive liquid crystal touch panel enables operations equivalent to touching the liquid crystal panel directly by hand.

  When the knocking protrusion 16a is further moved in the distal direction from the first exposed state, the rear end side rotation protrusion 15a of the knock bar 15 comes into contact with the front end side rotation protrusion 14f of the rotor 14 again, and the spring 12 It will push out further in the tip direction against the urging force. At this time, the rotor cam 14a slides in the distal direction along the second locking edge 32b. Then, at the point where the third inclined edge 33a is reached, the clockwise rotation is temporarily stopped, and at the same time, the third inclined edge 33a is kept in a state where the front end side rotation protrusion 14f is engaged with the rear end side rotation protrusion 15a. Toward the third locking edge 33b, while the leading end side rotation projection 14f is shifted by a half pitch again in the clockwise direction with respect to the rear end side rotation projection 15a and is not engaged. As shown in FIG. 10, the rotor cam 14 a is locked with the third locking portion 33. In this state, as shown in the cross-sectional view of FIG. 11, the knock cover 16 further moves in the distal direction, and maintains the state where the touch pen 20 is exposed. On the other hand, the ballpoint pen tip 13a protrudes from the tip of the front shaft 10. That is, in this state, the knock mechanism is at the foremost position, and the knocking writing instrument 1 is in the second exposed state shown in FIG. At this time, as shown in FIG. 11, the rotor 14 and the knock bar 15 are engaged with each other by the engaging portions 14g and 15b, and the knock cover 16 moves rearward from the position of the first exposed state. Is limited, the exposure of the touch pen 20 is maintained as in the first exposure state. In this state, as with the first exposure state, the liquid crystal touch panel can be operated with the touch pen 20, and at the same time, writing as a ballpoint pen is possible.

  When the knocking protrusion 16a is further moved in the distal direction from the second exposed state, the rear end side rotation protrusion 15a of the knock bar 15 is in contact with the front end side rotation protrusion 14f of the rotor 14, and the spring 12 It will push out further toward the tip against the urging force. At this time, the rotor cam 14a slides in the distal direction along the third locking edge 33b. Then, when the fourth inclined edge 34 is reached, the clockwise rotation is temporarily stopped, and at the same time, the tip-side rotation projection 14f is rotated clockwise by half a pitch, and the tip-side rotation projection 14f is moved to the rear end side. While being engaged with the rotation protrusion 15a, the fourth inclined edge 34 is moved in a clockwise direction so as to slide. When the fourth inclined edge 34 is exhausted, the rotor cam 14a is pushed back to the first locking portion 31 by the urging force of the spring 12 and comes into contact with the first inclined edge 31a as shown in FIG. The first inclined edge 31a is slid toward the first locking edge 31b, and the front-end-side rotation protrusion 14f meshes with the rear-end-side rotation protrusion 15a by a half pitch again in the clockwise direction. Not in a state. Then, as shown in FIG. 4 again, the rotor cam 14a is locked with the first locking portion 31. In this state, as shown in the sectional view of FIG. 7 again, the knock cover 16 moves toward the rear end and covers the touch pen 20. On the other hand, the ball-point pen tip 13a is also immersed in the tip shaft 10. That is, the knocking writing instrument 1 returns to the immersive state shown in FIG.

  It is also possible to shift to the second exposure state shown in FIG. 1C by a single knocking operation by deeply pushing the knocking projection 16a from the immersion state shown in FIG.

  INDUSTRIAL APPLICABILITY The present invention can be used for a knock-type writing instrument provided with an accessory such as a touch pen at the rear end, a friction body that discolors and discolors the handwriting of the thermochromic ink that discolors and discolors by friction heat, and an eraser.

1 Knock-type writing instrument
10 Lead shaft 11 Inner cylinder 12 Spring
13 Ballpoint pen refill 13a Ballpoint tip (writing tip)
14 Rotor 14a Rotor cam (engagement cam)
14b Intermediate part 14c Tip part 14d Cam mechanism part
14e Rear end 14f Front side rotation protrusion 14g Engagement with knock bar
15 Knock bar 15a Rear end rotation protrusion 15b Engagement with rotor
16 Knock cover (rear end covering member) 16a Knock protrusion
16b Outer cylinder through hole 17 Shaft cylinder 18 Outer cylinder
18a Guide slit 19 Touch pen holder 20 Touch pen (rear end accessory)
30 Cam groove
31 1st latching | locking part 31a 1st inclination edge 31b 1st latching edge
32 Second locking portion 32a Second inclined edge 32b Second locking edge
33 3rd locking part 33a 3rd inclined edge 33b 3rd locking edge
34 4th inclined edge

Claims (3)

A barrel,
A writing tip capable of appearing from the tip of the shaft tube;
A rear end attachment attached to the rear end of the shaft cylinder;
A knock mechanism involved in the appearance of the writing tip by a reciprocating movement in the front-rear direction by a knock operation;
A knock-type writing instrument comprising: a rear end covering member that reciprocates in the front-rear direction between a state of covering and exposing the rear end appendage in conjunction with the knock mechanism;
The knock mechanism is formed so as to be able to be locked at an intermediate position located between a rearmost position and a most advanced position in the range of the reciprocating movement,
In the state where the knock mechanism is at the rearmost end position, the writing front end is immersed in the shaft tube and the rear end appendage is covered with the rear end covering member,
In the state where the knock mechanism is locked at the intermediate position by a knock operation, the writing tip is immersed in the shaft tube, while the rear end appendage is exposed at the rear end of the shaft tube,
When the knock mechanism is in the most advanced position by a knocking operation, the writing tip protrudes from the tip of the shaft tube, and the rear end appendage is exposed at the rear end of the shaft tube. Knock-type writing instrument. A cam groove is formed in the rear end inner surface of the shaft cylinder,
The knock mechanism is
A rotor that is housed in the shaft cylinder and is movable in the front-rear direction in accordance with the operation of the knock mechanism and that rotates in the circumferential direction along the cam groove;
An engagement cam that is formed as a longitudinal protrusion on the outer periphery of the rotor and that engages with the cam groove;
The cam groove is provided with a first locking portion, a second locking portion, and a third locking portion, which are engaged in the rotation direction of the rotor, in this order, with which the engagement cam engages in a non-rotatable manner. With
The first locking portion is provided at the rearmost position,
The second locking portion is provided at the intermediate position,
The third locking portion is provided at the most advanced position,
In a state where the engagement cam is locked to the first locking portion, the knock mechanism is at the rearmost position,
In a state where the engagement cam is locked to the second locking portion, the knock mechanism is in the intermediate position,
2. The knock type writing instrument according to claim 1, wherein the knock mechanism is in the foremost position when the engagement cam is locked to the third locking portion. The rear end appendage is a touch pen,
The knock-type writing instrument according to claim 1 or 2, wherein a region near the rear end of the surface of the shaft cylinder has conductivity to conduct with the touch pen.

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