JP4906497B2 - Multi-core writing instrument - Google Patents

Description

  The present invention relates to a multi-core writing instrument in which a plurality of writing bodies are accommodated in a shaft cylinder, and a writing tip portion of a desired writing body can be selected and projected and retracted.

Conventionally, there are various feeding mechanisms in a multi-core writing instrument that can accommodate a plurality of writing bodies, for example, a plurality of ballpoint pen refills filled with inks of different colors in a shaft cylinder, and an arbitrarily selected writing body can appear and disappear. Has been proposed, for example
a) A cam groove formed on the wall surface of the shaft cylinder, a knock body having a cam surface at the tip, and a rotating cam body having a cam receiving portion meshing with the cam surface, and the rotating cam body in front of the knock body The cam receiving portion is provided in contact with the cam surface, the knock body and the rotating cam body are slidably disposed along the cam groove, and the rotating cam body is moved forward by pressing the knock body to be positioned at the position. In addition to the structure that holds the pendulum type push rod with the front as the free end and the opposite side connected to the rotating cam body, the writing tip of the desired writing body protrudes from the tip opening of the shaft tube. If you want to hold it, tilt the shaft cylinder so that the writing body is on the lower side and press the knocking body to tilt the tip of the pendulum-type push rod, so the rear end of the desired writing body or the back of the writing body The brush can be advanced by abutting against the member provided at the end, and the desired brush The writing tip of the body can be protruded from the tip opening of the shaft tube, and in order to immerse the writing tip from the tip opening of the shaft tube, the sheath shaft (rear shaft) is rotated due to the difference in structure. "Knock & twist type" that immerses the writing tip from the tip opening of the shaft cylinder, or "Knock & button that immerses the writing tip from the tip opening of the shaft cylinder by pressing a button formed on the clip part" What is said to be the "knock expression" of "expression",
b) A shaft cylinder is composed of a trunk shaft (also referred to as a front shaft) and a rotary shaft (also referred to as a rear shaft) that is connected to the rear of the barrel shaft so as to be rotatable. It is said to be a so-called “rotary type” in which the desired writing body is advanced by the cam inclined surface formed in the rotating shaft, and the writing tip is protruded from the tip opening of the shaft tube. What
c) A slide piece is attached to the rear end of the cursive body, and a raised portion formed on the slide piece is protruded outward from a slide groove formed on the rear end portion of the shaft tube so that a desired raised portion is formed on the shaft tube. What is said to be a so-called "slide type" in which the slide piece is advanced by pressing in the tip direction, the desired writing body is advanced, and the writing tip is protruded from the tip opening of the shaft tube and held. is there.

By the way, the feeding mechanism in the multi-core writing instrument in which six or more writing bodies are accommodated in the shaft cylinder is only the “sliding type” described above. In the case of “rotary type”, when six or more cursives are arranged in a circumferential shape, the distance between adjacent cursives is small, and the cam slope formed in the rotation shaft by rotating the rotation shaft with respect to the body axis Therefore, in order to advance the desired cursive body, it is necessary to make the angle of the cam slope formed on the rotating shaft an acute angle. However, if the angle of the cam slope is too acute, the operability is deteriorated and the cursive body is smoothed. Can not be paid out. The angle of the cam slope is absolutely required. Further, the writing tip is effortlessly infested from the front end opening of the barrel, it is necessary Ru Unisu I does not interfere writing tip other cursive other upon longitudinal movement of the cursive Therefore In order to prevent the cursive body from moving back and forth, the adjacent cursive bodies must be spaced apart from each other by a certain distance so as not to receive the cam action, and the shaft diameter of the shaft cylinder must be increased. Therefore, the “rotary type” feeding mechanism is not suitable as a feeding mechanism in a multi-core writing instrument in which a large number of writing bodies are accommodated in a shaft cylinder.

  In addition, the “knock type” feeding mechanism having a rotating cam has a structure with a pendulum type push rod, and in a multi-core writing instrument in which six or more writing bodies are accommodated in a shaft cylinder, writing of a desired writing body is surely performed. There is a difficulty in whether the tip can be projected and retracted from the tip opening of the shaft tube.

From this point of view, the feeding mechanism in the multi-core writing instrument has a simple structure, and the "sliding type" has been adopted that ensures the operability when the writing tip of the desired writing body is projected and retracted from the tip opening of the shaft cylinder. Yes. As such a “slide type” multi-core writing instrument, eight ballpoint pen single cores are accommodated in a shaft cylinder, and are individually inserted and fixed to the upper end portions of the respective ballpoint pen single cores, and the upper portion corresponds to each of the top portions of the head. The pen tip of the ball-point pen single core from the opening of the tip of the shaft cylinder by staking several push-out knock rods guided by the vertically long holes and capable of moving up and down to the internal spring force Is disclosed by Japanese Utility Model Laid-Open No. 3-87290 .

  Even in such a “slide type” multi-core writing instrument, the shaft diameter of the multi-core writing instrument in which six or more writing bodies are accommodated in the shaft cylinder is large, and there is a drawback that it is difficult to use as a real problem. In order to solve these problems, for example, the ball pen refill, which is a cursive body, has a thin outer diameter (resin refill φ3.1 mm is a thin metal refill φ2.3 mm). Coil springs that urge backwards to maintain and are inserted into each ballpoint pen refill, and other parts when the ballpoint pen refill slides back and forth (other ballpoint pen refills, inner wall surface of the shaft tube, etc.) Therefore, even if a coil spring is designed as thin as possible, the outer diameter of the coil spring is limited to φ3.0 mm. There is a limit to reducing the outer diameter.

In the “multi-core ballpoint pen”, in order to feed the pen tip 15 of the ballpoint pen single core 7 from the through hole 6 (tip opening) of the lower outer shaft 2, it is necessary to push down the feeding knock bar 8. However, in a multi-core writing instrument in which eight or more ballpoint pen single cores are housed in the shaft cylinder, a vertically long groove and a knocking bar for feeding are arranged almost all around the shaft cylinder, so a clip is attached to the shaft cylinder. When trying to do so, it is necessary to attach it at a position that does not interfere with the push-down operation of the feeding knock bar, and naturally the position is restricted by the forward position on the tip opening side of the shaft tube from the longitudinal groove. is there.
Japanese Utility Model Publication No. 3-87290

  In a multi-core writing instrument in which a plurality of writing bodies are accommodated in a shaft cylinder, writing for urging each accommodated writing body backward so as to be thinner than the shaft diameter of the shaft cylinder of a conventional multi-core writing instrument. No need for the same number of coil springs as the body, it is possible to make the writing tip of the desired writing body appear and disappear from the tip opening of the shaft tube with a simple operation, and when attaching a clip to the shaft tube, An object of the present invention is to obtain a multi-core writing instrument that is not subject to positional restrictions in the cylinder.

The present invention
“1. A multi-core writing instrument in which a plurality of writing bodies are accommodated in a shaft cylinder, and the knocking body is advanced by pressing the rotary operation body against the rear end of the shaft cylinder, and the writing body is A knock-type feeding mechanism that projects the writing tip is provided, and a rotary operation body is provided that is partially exposed to the outside of the shaft cylinder so that it can rotate with respect to the shaft cylinder and advance in conjunction with the knock body. By providing a locking portion that can be locked to the sliding body connected to the writing body on the rotating operation body or the member that is connected to the rotating operation body so as to be able to advance and rotate, at least by rotating the rotary operation body, When the rotary operating body is pressed, the locking portion can be locked to the desired sliding body of the writing body, and the knocking body is also advanced by the pressing of the rotary operating body , and the sliding body is locked by the locking portion. Only the body moves forward so that the writing tip of the desired writing body projects from the tip opening of the shaft tube. Possible with the multi-core writing instruments, characterized in that was.
2. The knock type feeding mechanism is composed of a cam groove formed on the wall surface of the shaft cylinder, a knock body having a cam surface at the tip, and a rotating cam body having a cam receiving portion meshing with the cam surface,
The rotary operation body is disposed at a rear end portion that protrudes from the rear end of the knock cylinder by forming a rod-shaped shaft portion that is inserted into the knock body and the rotation cam body,
The push rod body is arranged by loosely fitting the tip end portion of the rod-shaped shaft portion to the locking recess formed in the front end portion of the rotary cam body without rotating the rear end portion in conjunction with the rotation of the rotary cam body, The push rod body is connected so as to be able to rotate and advance in conjunction with the rotation of the rotary operation body,
The push rod body is provided in the push rod body on the inner cylinder body provided with the circumferential protrusion projecting in the axial radial direction having a notch groove communicating with the locking groove extending in the axial direction provided on the outer peripheral surface. The engaging protrusion protruding in the axial diameter direction serving as the locking portion is engaged with the notch groove, and the push rod body is slidably inserted back and forth,
The inner cylinder is fixed to the shaft cylinder so that it cannot slide back and forth and cannot rotate. The sliding case has a plurality of insertion holes in the bottom plate that prevent the rotation of the inner cylinder linked to the push rod body. Without accommodating,
The push rod body is urged toward the knock body by a coil spring,
Each of the plurality of writing body holders equipped with a sliding body having a holding portion capable of holding the circumferential protrusion and the locking protrusion is inserted into each insertion hole provided in the sliding case, thereby holding the sliding body. The parts are sandwiched between the circumferential protrusions of the inner cylinder or the locking protrusions of the push rod body and are arranged in the sliding case, and the writing bodies are inserted into the respective writing body holders and accommodated in the shaft cylinders. ,
By rotating the rotating operation body, the push rod body and the inner cylindrical body rotate in conjunction with each other , and by pressing the rotation operation body, the knock body, the rotating cam body, and the push rod body advance in conjunction with each other, and the engagement of the push rod body. 2. The multi-core writing instrument according to 1 above, wherein only the sliding body of the sliding body sandwiched between the stoppers can be advanced. "
It is.

  Since the present invention has the structure as described above, even if ten writing bodies having the same dimensions as the shaft diameter of the writing cylinder in a multi-core writing instrument in which four writing bodies are housed in the shaft cylinder are conventionally commercially available. It can be made thinner than the shaft diameter of the shaft tube of the multi-core writing instrument, and the clip can be attached at a desired position of the shaft tube, so that there is no restriction on the position. Furthermore, since it is not necessary to urge each writing body backward, there is an advantage that the number of necessary springs can be reduced and the cost is advantageous as compared with a multi-core writing instrument having a conventional structure. .

The present invention relates to a multi-core writing instrument in which a plurality of writing bodies are accommodated in a shaft cylinder, and the sliding of the desired writing body to the front and rear is known in order to select and make the writing tip portion of the writing body appear and disappear. For example, a locking hole provided on the outer peripheral wall surface of the shaft cylinder and a locking projection that locks into the locking hole provided in the knock body, and the knock body is pressed by pressing the knock body. The locking protrusion is locked into the locking hole so that the writing tip of the writing body protrudes from the tip opening of the shaft tube and is formed on the wall surface of the shaft tube. A feeding mechanism comprising a cam groove, a knock body having a cam surface at the tip, and a rotating cam body having a cam receiving portion meshing with the cam surface is used. In order to advance only the desired writing body by pressing the knock body, the rotary operation body is connected to the knock body, and the rotation operation body is connected so as to be rotatable and advanceable as the rotary operation body rotates and advances. The member is provided with a locking portion that can be locked to the sliding body connected to the writing body. The locking part is a locking protrusion protruding in the axial direction, and the locking protrusion is locked to a holding part provided on a sliding body connected to the writing body, so that the locking protrusion is in accordance with the pressure of the knocking body. Only the writing body of the sliding body of the holding part that is locked is moved forward so that the writing tip part protrudes from the tip opening part of the shaft tube.

  In this embodiment, a multi-core writing instrument in which eight ballpoint pen refills are housed in a shaft cylinder will be described as an example. However, the writing body is a ballpoint pen refill and eight multi-core writing instruments are housed in a shaft cylinder. It is not limited to.

  FIG. 1 is a longitudinal sectional view showing the structure of the main part of the multi-core writing instrument of this embodiment. FIG. 2 is an enlarged cross-sectional view of the structure of the main part in FIG. FIG. 3 is a diagram illustrating a state in which the writing tip of a desired writing body is protruded from the tip opening of the shaft cylinder in the multi-core writing instrument in FIG. 1. FIG. 4 is an enlarged perspective view of the push rod body in the present embodiment. FIG. 5 is an enlarged perspective view of the inner cylinder in the present embodiment. FIG. 6 is an enlarged perspective view of the sliding case in the present embodiment. FIG. 7 is an enlarged perspective view showing a structure for projecting the writing tip of the desired writing body from the tip opening of the shaft tube, and showing a state in which the inner tube body, the push rod body, and the writing body holder are set in the sliding case. It is. FIG. 8 is an enlarged end view of the AA line portion in FIG. 1. FIG. 9 is an enlarged perspective view of the cursive holder in the present embodiment. FIG. 10 is an enlarged end view of the BB line portion in FIG. FIG. 11 is a diagram illustrating a state when the push rod body is pressed and operated in FIG. 7.

  As shown in FIGS. 1 and 3, the multi-core writing instrument 1 of this embodiment that accommodates eight ballpoint pen refills in a shaft cylinder includes a front shaft 2 a and a rear shaft 2 b in which the shaft tube 2 has a tip opening 3. The front shaft 2a is detachably screwed to the connecting cylinder 4 fixed to the rear shaft 2b. Inside the rear side of the rear shaft 2b, a cam groove 5 formed on the inner wall surface of the rear end portion of the rear shaft 2b, and a knock body 6 having a cam surface (not shown) made of chevron-shaped irregularities at the tip, A conventionally known knock-type feeding mechanism is provided which includes a rotating cam body 7 having a cam receiving portion (not shown) that meshes with the cam surface. As is well known, the rotating cam body 7 and the knocking body 6 are slidably disposed along the cam groove 5, and the knocking body 6 and the rotating cam body 7 are formed in a cylindrical shape to form the rotating cam body 7. The formed shaft portion 7 a is loosely fitted inside the knock body 6 so as to be slidable with respect to the knock body 6.

  At the rear end portion of the knock body 6 protruding from the rear end portion of the rear shaft 2b, the rotary operation body 8 is rotatable with respect to the knock body 6, and the rod-shaped shaft portion 9 formed on the rotary operation body 8 is connected to the knock body 6. The inside and the inside of the rotating cam body 7 are inserted. A push rod body 10 is provided at the distal end portion of the rod-like shaft portion 9, and the distal end portion of the rod-like shaft portion 9 is slidable back and forth in a fitting hole 11 formed at the rear end portion of the push rod body 10. The shaft portion 9 is rotatably inserted and connected in conjunction with the rotation of the shaft portion 9. In order to allow the push rod body 10 to rotate in conjunction with the rod-shaped shaft portion 9, in this embodiment, the tip portion of the rod-shaped shaft portion 9 has a quadrangular cross section, and the fitting hole 11 also has a quadrangular cross section. (See FIG. 4). As shown in FIG. 4, the push rod body 10 is composed of a shaft body portion 10a having a circular cross section and a sliding shaft portion 10b having a small diameter, and a cross-sectional shape is circular on the outer periphery of the shaft body portion 10a. Is provided with an engaging projection 12 having a shape obtained by dividing the portion into eight. The rear end portion of the push rod body 10 is loosely fitted and supported in a locking recess 13 formed at the front end portion of the rotating cam body 7. The rotating cam body 7 can rotate without being blocked by the push rod body 10, and the push rod body 10 does not rotate in conjunction with the rotating cam body 7.

As shown in FIG. 5, the outer ring of the push rod body 10 has a locking groove 14 extending in the axial direction on the outer peripheral surface and a notch groove 15 having substantially the same shape with which the engaging protrusion 12 can be engaged. An inner cylindrical body 17 provided with a circumferential projection 16 projecting in the axial diameter direction is engaged with an engagement protrusion 12 formed on the push rod body 10 in the notch groove 15, and the engagement protrusion 12 is a locking groove. 14 is slidable and the push rod 10 is slidably moved back and forth in the inner cylinder 17.

  As shown in FIG. 6, the rear shaft 2 b has a disc-shaped bottom plate 18, a compartment 19 having a circumference divided into eight, and a storage portion 20 for storing the inner cylindrical body 17. A sliding case 21 is disposed with a rear end supported by a fixing cylinder 22 screwed onto an inner wall surface of the rear shaft 2b. As shown in FIG. 2, one end of the inner cylinder 17 is brought into contact with a step portion 23 (see FIG. 5) formed by reducing the tip 17a of the inner cylinder 17 and the other end is slid. The coil spring 24 disposed in contact with the bottom plate 18 of the moving case 21 is urged toward the knock body 6 side, and a support protrusion 25 formed on the bottom plate 18 of the sliding case 21 at the tip portion 17a (see FIG. 5). And the inner cylinder 17 is accommodated in the accommodating portion 20 of the sliding case 21. The sliding shaft portion 10 b of the push rod body 10 accommodated in the inner cylinder body 17 is inserted through a support hole 26 formed through the support protrusion 25. As a result, since the push rod body 10 is supported at the rear end by the rotating cam body 7 and at the front end by the sliding case 21, the push rod body 10 slides smoothly without swinging back and forth during sliding back and forth.

  As shown in FIG. 5, a rotation suppression claw 28 having a contact portion 27 that can contact the inner wall surface of the rear shaft 2 b protruding in the axial radial direction is opposed to the rear end of the inner cylinder 17. As shown in FIG. 8, eight linear protrusions 29 extending in the axial direction are provided on the inner wall surface of the rear shaft 2 b that is provided at the location and faces the rotation suppression claw 28. This is because the rotation operation body 8 and the push rod body 10 and the inner cylinder body 17 connected to the rotation operation body 8 rotate inadvertently when the contact portion 27 of the rotation suppression claw 28 contacts the linear protrusion 29. This is to prevent a slight operational feeling during rotation. Further, the rear end of the sliding case 21 opposite to the bottom plate 18 is brought into contact with the front end surface of the linear protrusion 29 so that the sliding case 21 cannot move to the knock body 6 side. The bottom plate 18 of the sliding case 21 is provided with eight insertion holes 30 in a circumferential shape (see FIG. 6).

  As shown in FIG. 9, each compartment 19 of the sliding case 21 is clamped so that the engagement protrusion 12 of the push rod 10 or the circumferential protrusion 16 of the inner cylinder 17 can be clamped at the rear end of the pipe 31. As shown in FIG. 7, the writing body holder 34 to which the sliding body 33 having the portion 32 is fixed holds the holding portion 32 between the engaging protrusion 12 or the circumferential protrusion 16 and the pipe 31 is inserted into the insertion hole 30. It is provided by being inserted through. By inserting a ballpoint pen refill 35 filled with, for example, black, red, blue, green, yellow, brown, orange, purple ink into each cursive holder 34, as shown in FIG. 8 ballpoint pen refills 35 are accommodated.

  The push rod body 10 includes a step portion 36 (see FIG. 4) formed by the shaft main body portion 10a of the push rod body 10 and a small-diameter slide shaft portion 10b, and a support protrusion 25 of the slide case 21 (see FIG. 6). ) Is provided with a coil spring 38 via a washer 37 (see FIG. 2), the push rod body 10 is urged toward the knock body 6, and the rear end portion of the push rod body 10 is a rotating cam. The body 7 is not separated from the locking recess 13.

  Although not shown, a dot-shaped display mark is formed on the rear end surface 2ba of the rear shaft 2b in the same color as the color of the filled ink corresponding to the position where the ball-point pen refills 35 of the respective colors are disposed. In the outer peripheral surface of the rotary operation body 8, a linearly extending axially projecting slightly at the same position on the circumference as the engagement protrusion 12 formed on the push rod body 10 connected to the rotary operation body 8. The instruction mark is formed.

  In the drawing, reference numeral 39 denotes a coil spring disposed between the knock body 6 and the rotating cam body 7, and the rotating cam body 7 advances along the cam groove 5 so that the rotating cam body 7 and the knock body 6 are separated from each other. This is to prevent the knock body 6 from sliding back and forth. Naturally, the biasing force is smaller than the biasing force of the coil spring 38 attached to the push rod body 10.

In order to project the tip end portion (writing tip end portion) 40 of the ballpoint pen refill 35 filled with the ink of the desired color from the tip opening portion 3 of the shaft cylinder 2, first, the rotary operation body 8 is rotated, and the indication mark is Match the display mark with the same color. Accordingly, the push rod body 10 is also rotated in conjunction with the rotation of the rotary operation body 8, and the slide of the writing body holder 34 of the ball pen refill 35 filled with ink of a desired color is formed on the engagement protrusion 12 formed on the push rod body 10. Engage with the clamping part 32 of the moving body 33. The pinching portion 32 of the sliding body 33 of the other ballpoint pen refill 35 engages with the circumferential protrusion 16 of the inner cylindrical body 17. In this state, when the rotary operation body 8 and the knock body 6 are pressed, a conventionally known “knock type” constituted by the cam groove 5, the knock body 6 and the rotary cam body 7 formed on the inner wall surface of the shaft cylinder 2 is used. The rotating cam body 7 is maintained in the advanced state by the action of the feeding mechanism (see FIG. 3), and the push rod body 10 connected to the rotating cam body 7 also moves forward in the inner cylindrical body 17 , Only the ball-point pen refill 35 inserted in the writing body holder 34 (see FIG. 11) of the sliding body 33 that is maintained in the state and engaged with the engaging protrusion 12 moves forward so that the tip end portion 40 opens the tip end of the front shaft 2a. It is maintained in a state protruding from the portion 3.

  In order to immerse the tip end portion 40 of the ballpoint pen refill 35 protruding from the tip opening portion 3 into the front shaft 2a, the rotary operation body 8 and the knock body 6 are pressed as in the conventional “knock type” feeding mechanism. The knocking body 6 and the rotating cam body 7 are retracted by the cam action of the knocking body 6 and the rotating cam body 7 with respect to the cam groove 5 in the conventional “knock-type” feeding mechanism, and the coil spring 38 is biased backward. Accordingly, the push rod body 10 is also retracted, so that the ballpoint pen refill 35 attached to the writing body holder 34 of the sliding body 33 of the clamping portion 32 engaged with the engaging projection 12 is also retracted, and the tip end portion 40 of the tip 2a is moved forward. Immerse in.

The inner cylinder 17 is biased toward the knock body 6 by the coil spring 24, and therefore the seven writing body holders 34 holding the sliding body 33 between the circumferential protrusions 16 are lifted by the inner cylinder 17. Thus, the writing tip portion of the writing body attached to each of the writing body holders 34 does not protrude from the tip opening portion 3 of the front shaft 2a. Further, by forming a gap between the front end face of the inner cylinder 17 and the bottom plate 18 of the sliding case 21, the writing body holder 34 and the holding part 32 of the sliding body 33 of the writing body holder 34 are connected to the inner cylinder. When sandwiched and attached to the circumferential protrusion 16 of the body 17, it is slid forward to facilitate attachment.

  In the multi-core writing instrument 1 of the present embodiment, the ballpoint pen refill 35 is replaced by removing the front shaft 2a from the rear shaft 2b and pulling the ballpoint refill 35 to be replaced forward (toward the tip end portion 40). Since it can be easily pulled out from 34, a new ballpoint pen refill 35 may be inserted there.

  The present invention is suitable for a multi-core writing instrument that accommodates six or more writing bodies, in which the shaft diameter of the shaft tube inevitably increases.

It is the longitudinal cross-sectional view which showed the structure of the principal part in the multi-core writing instrument of a present Example. It is an expanded sectional view of the structure of the principal part in FIG. In the multi-core writing instrument in FIG. 1, it is a figure which shows the state which made the writing front-end | tip of the desired writing body protrude from the front-end | tip opening part of a shaft cylinder. It is an expansion perspective view of a push rod body in a present Example. It is an expansion perspective view of the inner cylinder in a present Example. It is an expansion perspective view of a sliding case in a present Example. FIG. 5 is an enlarged perspective view showing a structure for projecting a writing tip of a desired writing body from a tip opening of a shaft cylinder, and showing a state where an inner cylinder body, a push rod body, and a writing body holder are set in a sliding case. It is an enlarged end elevation of the AA line part in FIG. It is an expansion perspective view of the cursive holder in a present Example. FIG. 3 is an enlarged end view of a BB line portion in FIG. 1. In FIG. 7, it is a figure which shows the state at the time of pressing and operating a push rod body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Multi-core writing instrument 2 Shaft cylinder 2a Front shaft 2b Rear shaft 5 Cam groove 6 Knock body 7 Rotating cam body 8 Rotating operation body 9 Rod-shaped shaft part 10 Push rod body 12 Engagement protrusion 14 Locking groove 15 Notch groove 16 Circumferential protrusion Part 17 Inner cylinder 18 Bottom plate 21 Sliding case 30 Insertion hole 32 Holding part 33 Sliding body 34 Writing body holder 35 Ballpoint pen refill 38 Coil spring

Claims (2)

A multi-core writing instrument containing a plurality of writing bodies in a shaft cylinder, and the knocking body is advanced by pressing the rotary operation body against the rear end of the shaft cylinder, so that the writing tip of the writing body from the tip opening of the shaft cylinder A knock-type feeding mechanism that protrudes from the shaft cylinder is provided, and a rotary operation body is disposed so that a part thereof is exposed to the outside of the shaft cylinder and can be rotated with respect to the shaft cylinder and can be moved forward in conjunction with the knock body. At least a rotating operation body is provided by providing a locking portion that can be engaged with a sliding body connected to a writing body on a member that is connected to a body or a rotating operation body so as to be able to move forward and rotate. When the pressing part is pressed, the locking part can be locked to the sliding body of the desired writing body, and the knocking body is also advanced by the pressing of the rotary operation body , and only the writing body of the sliding body locked by the locking part is provided. By moving forward, the writing tip of the desired writing body can protrude from the tip opening of the shaft tube. Multi-core writing instrument and said that it has. The knock type feeding mechanism is composed of a cam groove formed on the wall surface of the shaft cylinder, a knock body having a cam surface at the tip, and a rotating cam body having a cam receiving portion meshing with the cam surface,
The rotary operation body is disposed at a rear end portion that protrudes from the rear end of the knock cylinder by forming a rod-shaped shaft portion that is inserted into the knock body and the rotation cam body,
The push rod body is arranged by loosely fitting the tip end portion of the rod-shaped shaft portion to the locking recess formed in the front end portion of the rotary cam body without rotating the rear end portion in conjunction with the rotation of the rotary cam body, The push rod body is connected so as to be able to rotate and advance in conjunction with the rotation of the rotary operation body,
The push rod body is provided in the push rod body on the inner cylinder body provided with the circumferential protrusion projecting in the axial radial direction having a notch groove communicating with the locking groove extending in the axial direction provided on the outer peripheral surface. The engaging protrusion protruding in the axial diameter direction serving as the locking portion is engaged with the notch groove, and the push rod body is slidably inserted back and forth,
The inner cylinder is fixed to the shaft cylinder so that it cannot slide back and forth and cannot rotate. The sliding case has a plurality of insertion holes in the bottom plate that prevent the rotation of the inner cylinder linked to the push rod body. Without accommodating,
The push rod body is urged toward the knock body by a coil spring,
Each of the plurality of writing body holders equipped with a sliding body having a holding portion capable of holding the circumferential protrusion and the locking protrusion is inserted into each insertion hole provided in the sliding case, thereby holding the sliding body. The parts are sandwiched between the circumferential protrusions of the inner cylinder or the locking protrusions of the push rod body and are arranged in the sliding case, and the writing bodies are inserted into the respective writing body holders and accommodated in the shaft cylinders. ,
By rotating the rotating operation body, the push rod body and the inner cylindrical body rotate in conjunction with each other , and by pressing the rotation operation body, the knock body, the rotating cam body, and the push rod body advance in conjunction with each other, and the engagement of the push rod body. The multi-core writing instrument according to claim 1, wherein only the sliding body of the sliding body sandwiched between the stoppers can be advanced.

Images