TW201623028A - Multi-lead writing implement - Google Patents

Abstract

Provided is a multi-lead writing implement, which is not directional during writing and with which the same stable writing feel is obtained. Additionally, the occurrence of excess ink adhesion, paper clogging and blurring has been improved and bending does not occur easily during writing even when the lead is soft as with PP tubes, making the feeling of writing stability favorable. A multi-lead writing implement (1), in which a lead (7) can be selectively advanced and retracted from a shaft tube tip opening (3a), is configured so that in conjunction with an operation to expose the selected lead (7) in a writable state, the lead (7) is guided to a position on the central axis line of the shaft tube (2) by a guiding member (4b) provided inside the shaft tube (2) and is exposed in a state that is essentially parallel to the central axis line.

Description

Multi-core pen

The present invention relates to a multi-core writing instrument that can selectively project and retract a plurality of cores from a front end opening of a barrel.

Generally, in a multi-core writing instrument, a plurality of cores are disposed at a position away from the axis of the barrel toward the radial direction. Therefore, at the time of writing, the selected center core is bent in the radial direction from the rear side toward the front in the position where the front end portion of the bobbin is located, and is protruded from the front end portion of the bobbin in a state where the center core is inclined. As a result, each of the cores is inclined in a different direction, and the directionality at the time of writing due to the selected center core is different, and there is a problem that writing stability is lacking. Further, there is a problem in that the directionality of the grip shaft and the directionality caused by the operation of rotating the barrel at the time of writing are lacking in writing stability.

In particular, in the case of a ball pen, since the core is inclined, it is easy to occur: ink overflow means that the ink that has not been transferred from the ball to the paper surface is scraped up by the small hole of the pen tip and accumulated in the vicinity of the front end of the small hole. The phenomenon of sticking to the paper surface after the outside; biting the paper means that the front end of the pen tip scratches the paper surface, and foreign matter such as lint on the paper surface is mixed into the ball retaining hole; And water cuts and so on. Furthermore, in the case where the core is soft like a PP tube (polypropylene tube), the core is bent at the time of writing, and the writing stability is poor. Further, in the case where the core is as hard as a metal and a thick refill, for example, since the relationship between the pressing bar and the center core must be bendable, there is a problem that swaying occurs and the writing stability is impaired. In order to cope with such problems, the proposal is such that, as in Patent Document 1, the rotary writing unit is rotated in the barrel by changing the direction of the shaft, and the center of the core is aligned with the axis and then protruded. As in Patent Document 2, by changing the direction of the bobbin, the portion located at the upper portion is moved downward by the self-weight. However, this is because the alignment of the core is not easy, and the core is unitized separately, so there is a problem that the shaft is large.

[Previous Technical Literature] [Patent Literature]

Patent Document 1 Japanese Patent Laid-Open Publication No. 2013-091258

Patent Document 2 Japanese Patent Laid-Open Publication No. 2013-091239

The present invention has been made in view of the above-mentioned state of the art, and an object thereof is to provide the same writing hand feeling that is non-directional and stable at the time of writing without the need for alignment of the core, and to improve the occurrence of ink overflow, paper biting, and water breakage, and Even in the case where the core is as soft as a PP tube, it is difficult to produce a multi-core writing instrument which is curved and has good writing stability.

According to the present invention, the above problems are solved by the following means.

(1) A multi-core writing instrument capable of selectively projecting and retracting a core from an opening end of a shaft barrel, characterized in that the selected core is interlocked with an operation for extending the refill in a writing state. The center core is guided to a position of a central axis of the barrel by a guide member provided in the barrel, and is in a state of extending the refill in a state substantially parallel to the center axis.

When the core is guided to the position of the center axis in a state where the center core is parallel to the central axis of the barrel, the state of the pen core is extended, so that the case where the refill is extended in the state where the center core is inclined is solved. The problem that arises. Furthermore, since the center core is guided to the position of the central axis of the barrel by the interlocking member and the operation for extending the refill in the writing state, the alignment of the center core is not required.

(2) The above-mentioned item (1), wherein the multi-core pen is slid in a state in which the pressing operation portion corresponding to each of the cores is slid toward the front end of the bobbin in a state in which the refill is pushed out. Operating, whereby the center core corresponding to the pressing operation portion subjected to the sliding operation is linked to the sliding operation, and the guiding member disposed in the barrel is guided to the position of the central axis of the barrel, substantially The state in which the center axis is parallel is a state in which the refill is extended.

When it is constructed in this way, it is solved in the push-type multi-core pen, in The problem that occurs when the core is tilted out of the refill.

(3) The above item (2), wherein the guiding member is provided to correspond to each of the cores.

In such a configuration, each of the cores is guided to the position of the center axis by a guide member in a state parallel to the central axis of the barrel to be in a state of extending the refill.

(4) The above item (1), (2), or (3), wherein the core holding member that removably holds the core is provided, and the core holding member is guided by the guiding member Thereby, the center core is guided to the position of the central axis of the barrel.

In such a configuration, it is easy to guide the position of the center core to the center axis in a state where the center core is parallel to the central axis of the barrel, and to extend the refill state.

(5) The above-mentioned item (4), wherein the guide member is formed as a guide plate composed of a plate-like body extending from the inner wall side of the barrel toward the central axis of the barrel, and is configured to have an inclined side. a guide plate, the inclined side extending from the inner wall side of the shaft cylinder toward the central axis along the rear end side of the plate-shaped body at the rear end side of the barrel, and being close to the front end side of the barrel, on the other hand, The center core holding member is provided with an engaging hole or an engaging groove slidably engaged with the guide plate, and the engaging plate is engaged with the engaging hole or the engaging groove, The pressing operation portion performs a sliding operation toward the front end direction of the bobbin, and the core holding member is guided by the guide plate, and is guided to the position of the central axis of the barrel together with the center core, and is reset at the pressing operation portion. At the same time as the position before the operation, the center core inserted in the core holding member is also reset to the position before the operation.

When the guide plate is engaged with the engagement hole of the core holding member, the pressing operation portion is slid in the distal end direction of the barrel, and the core holding member is easily guided by the guide plate. Guided, the core can be placed on the central axis of the barrel.

(6) The above-mentioned item (4) or (5), wherein the guide member is configured as a guide plate composed of a plate-like body extending from the inner wall side of the barrel toward the central axis of the barrel The inclined side is formed in a stepped shape in the longitudinal direction of the barrel, and the stepped portion is used as a guiding plate of the locking portion, and the inclined side is located in the shaft barrel along with the plate-shaped body in the guiding plate The front end side of the front end side extends from the inner wall side of the bobbin toward the center axis, and is close to the front end side of the bobbin, and on the other hand, the locked portion of the locking portion can be locked on the core holding member. When the engagement hole or the engagement groove is provided in a state in which the center core is housed in the barrel, the locking portion of the guide plate can be locked to the locked portion of the core holding member. .

In such a configuration, the positional stability of the center core in the accommodated state is improved by the locking of the locking portion of the guide plate and the locked portion of the core holding member, and since it is transferred from the stored state to the extended state In the period of the refill state, the middle core moves in the longitudinal direction of the bobbin without tilting, so that the core holding member of the center core can be prevented from shifting from the extended refill state to the stowed state. The core of the core retains the resistance between the two members.

(7) The above-mentioned item (5) or (6), wherein the guide sliding groove that guides the side while guiding the guide plate is continuous with the engaging hole or the engaging groove from the rear end toward the front. , disposed on the core retaining member surface.

In such a configuration, when the guide plate slides in the front-rear direction on the upper surface of the core holding member, it can be stably slid without being shaken left and right.

(8) The above-mentioned item (4), (5), (6), or (7), wherein the pressing operation portion that protrudes toward the outside of the barrel is slid by the punching of the wall portion of the barrel The slot is coupled to the pressing rod located in the barrel, and the pressing rod or the pressing rod integrally formed with the pressing operation portion and the core holding member are coupled by a connecting rod member, and the connecting rod member is opposite to the foregoing The pressing rod or the pressing rod integrally formed with the pressing operation portion and the core holding member are rotated.

In such a configuration, it is not necessary to move the pressing rod toward the central axis side of the barrel, and it is easy to position the center core holding member at the aforementioned center axis.

(9) The above item (8), wherein the tension spring is interposed between the rear end of the pressing rod and the inner rear end of the barrel, and is projected from the opening end of the barrel by the operation of pressing the operation portion The center core is returned to the position before the operation of the pressing operation portion by the action of the tension spring.

In such a configuration, since it is not necessary to generally use the compression spring for accommodating the core from the writing state into the barrel, the structural design for allowing the core holding member to be located in the barrel of the central axis of the barrel is further easily.

According to the present invention, it is possible to provide the same writing hand feeling that is non-directional and stable when writing without the alignment of the center core, and to improve the occurrence of ink overflow, paper biting, water breakage, and even in the middle core. In the case of a soft PP tube, it is difficult to produce a multi-core writing instrument that is curved and has good writing stability. Moreover, even if the core is as hard as a metal and a thick core, the core can be smoothly switched and the writing stability is good. Furthermore, since the front end of the core is not guided against the inner wall of the front axle, the ink does not adhere to the inner wall of the front axle, and the front axle is transparent and does not have a poor appearance. problem.

1‧‧‧Multi-core pen

2‧‧‧ shaft tube

3‧‧‧ front axle

3a‧‧‧ front opening

4‧‧‧ center axis

4a‧‧‧ inner wall

4b‧‧‧Guideboard

4c‧‧‧ rear end

4d‧‧‧ front side

4e‧‧‧ card stop

5‧‧‧ rear axle

5a‧‧‧Sliding slot

6‧‧‧ 盖部

7‧‧‧SMIC

8‧‧‧Core holding member

8a‧‧‧ Ontology

8b‧‧‧Side inserts

8c‧‧‧ stuck bulge

8d‧‧‧ card stop

8e‧‧‧ Guided sliding slot

8f‧‧‧ snap hole

8g‧‧‧ rear inner wall

8h‧‧‧ front inner wall

8i‧‧‧The locked part

9‧‧‧Connecting rod

9a‧‧‧ Plate

9b‧‧‧ front locking hole

9c‧‧‧ rear card hole

9d‧‧‧ front slot

9e‧‧‧ rear slot

10‧‧‧ Pressing bar

10a‧‧‧ plate body

10b‧‧‧ stuck bulge

10c‧‧‧ card stop

10d‧‧‧ card hole

10e‧‧‧Spring card stop

10f‧‧‧The front release piece

10g‧‧‧ rear stop release film

10h‧‧‧ front fixed piece

10i‧‧‧ rear fixed piece

11‧‧‧ stretching spring

12‧‧‧Spring Brakes

12a‧‧‧Spring card hole

13‧‧‧ Pressing the operation department

13a‧‧‧Chimeric gap

13b‧‧‧ fitting holes

Fig. 1 is an exploded perspective view showing an embodiment of a multi-core writing instrument of the present invention. In addition, the SMIC is only labeled one, and the others are omitted.

Fig. 2 is a central longitudinal sectional view showing the completion of assembling the multi-core writing instrument shown in Fig. 1. (a) shows the storage state of the center core, (b) shows the state when the center core moves, and (c) shows the state of the pen core extension.

Fig. 3 is a partially enlarged view of the inside of a rectangle III indicated by a chain line in Fig. 2; Similarly to Fig. 2, (a) shows the state in which the center core is stored, (b) shows the state in which the center core moves, and (c) shows the state in which the core is extended.

Fig. 4 is an enlarged cross-sectional view taken along line IV-IV of Fig. 2. Similarly to Fig. 2, (a) shows the state in which the center core is stored, (b) shows the state in which the center core moves, and (c) shows the state in which the core is extended.

Fig. 5 is a front elevational view, a right side view, a left side view, and a cross-sectional view taken along the line A to A of the enlarged front view of the front axle.

Figure 6 is an enlarged front view, right side view, left side view of the center axis, And a cross-sectional view taken along line B~B of the right side view.

Figure 7 is an enlarged perspective view of the rear axle.

Figure 8 is an enlarged front view, right side view, and left side view of the spring brake member.

Fig. 9 is an enlarged perspective view of the lid portion.

FIG. 10( a ) is an enlarged perspective view of the core holding member, the link member, the pressing rod, and the pressing operation portion, and FIG. 10( b ) is a core holding member, a link member, and a pressing member other than the pressing operation portion. An enlarged perspective view of the connection by pressing the rod.

Fig. 11(a) is an enlarged perspective view of the core holding member, Fig. 11(b) is a central longitudinal sectional view, and Fig. 11(c) is a sectional view taken along line C-C of the central longitudinal sectional view, No. 11 (d) The same figure is a cross-sectional view taken along line D to D of the central longitudinal sectional view.

Fig. 12(a) is an enlarged perspective view of the link member, Fig. 12(b) is an enlarged plan view, and Fig. 12(c) is an enlarged bottom view.

Fig. 13(a) is an enlarged plan perspective view of the pressing bar, and Fig. 13(b) is an enlarged bottom perspective view.

Fig. 14 (a) is an enlarged plan perspective view of the pressing operation portion, and Fig. 14 (b) is an enlarged bottom view.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Figure 1 is a view showing a multi-core pen applying the present invention to a push-type ball pen An exploded perspective view with a case of 1. In addition, the SMIC is only labeled one, and the others are omitted.

The shaft barrel 2 is composed of a front shaft 3, a center shaft 4, a rear shaft 5, and a lid portion 6.

Parts of the front shaft 3, the middle shaft 4, the rear shaft 5, and the lid portion 6 are enlarged in the fifth, sixth, seventh, and ninth views, respectively.

In the barrel 2, the center core 7, the core holding member 8, the link member 9, the pressing rod 10, the tension spring 11, and the spring stopper 12 are disposed in order from the front to the rear.

Fig. 10(a) is an enlarged perspective view of the core holding member 8, the link member 9, the pressing bar 10, and the pressing operation portion 13, and Fig. 10(b) is a view showing the three other members except the pressing operation portion 13. An enlarged perspective view of the.

As shown in Fig. 11, the core holding member 8 is provided with a core insertion projection 8b at the front end of the body 8a which is elongated in the front-rear direction, and a card having the locking projection 8c at the rear end. Stop 8d.

The link member 9 is a top perspective view of Fig. 12(a), a plan view of (b), and a bottom view of (c).

The link member 9 has a shape in which the left and right plate-like pieces 9a having a substantially arc-shaped rectangular shape at the front and rear ends are connected at the center. In the vicinity of the front and rear ends of the plate-like piece 9a, a front locking hole 9b and a rear locking hole 9c penetrating in the left-right direction are punched out. A front groove 9d which gradually becomes shallower from the upper side toward the front locking hole 9b and a rear groove 9e which gradually becomes shallower from the lower side toward the rear locking hole 9c are provided on the opposing faces of the left and right plate-like pieces 9a.

When the core holding member 8 and the link member 9 are to be coupled, the locking piece 8d at the rear end of the core holding member 8 is inserted between the front and rear grooves 9d of the link member 9 from above, and the locking projection is held. The 8c card can be stopped at the front locking hole 9b.

Therefore, the core holding member 8 and the link member 9 are rotatably coupled to each other with the locking projection 8c as a rotation axis.

Fig. 13 is a view showing an enlarged part of the pressing bar 10. (a) is a top perspective view, and (b) is a bottom perspective view.

The pressing bar 10 is a front end of a plate-like body 10a which is elongated in the front-rear direction, and is provided with a locking piece 10c having a locking protrusion 10b on the right and left sides, and a spring locking portion 10e having a locking hole 10d is provided at the rear end.

On the lower surface of the plate-like body 10a, a front release piece 10f for stopping and releasing the center core 7 in a state in which the refill is extended, and a rear stop release piece 10g are provided. A front fixing piece 10h for fixing the pressing operation portion 13 and a rear fixing piece 10i are provided on the upper surface of the plate-like body 10a.

When the pressing rod 10 and the link member 9 are coupled, the locking piece 10c at the distal end of the pressing rod 10 is inserted between the right and left rear grooves 9e of the link member 9 from below, and the locking projection 10b is locked. It is sufficient to lock the hole 9c at the rear. Therefore, the pressing bar 10 and the link member 9 are coupled to each other by the locking projection 10b as a rotation axis.

Fig. 14 is a view showing an enlarged part of the pressing operation portion 13. (a) is a top perspective view, and (b) is a bottom view. The fitting notch 13a is provided at the front end of the pressing operation portion 13, and the fitting hole 13b is provided on the bottom surface. When the pressing operation portion 13 is fixed to the pressing rod 10, it is only necessary to pass through the setting The slide groove 5a of the shaft 5 respectively engages the front fixing piece 10h and the rear fixing piece 10i of the pressing bar 10 disposed in the barrel 2, and is fitted to the pressing operation portion 13 disposed outside the shaft tube 2 The notch 13a and the fitting hole 13b may be combined. Further, the pressing operation portion 13 may be formed integrally with the pressing rod 10.

The core 7 is held by the core holding member 8 by detachably mounting the rear end of the core 7 to the center core mounting boss 8b provided on the front end of the core holding member 8. The core 7 is guided by the core guide 14 mounted in the center shaft 4 without being in contact with the other cores.

The core guide 14 of Fig. 1 indicates that the center core 7 is three, and three guide grooves 14a are provided.

The multi-core writing instrument 1 of the present invention can selectively project and retract the core 7 from the front end opening portion 3a of the barrel 2, and is characterized in that the selected core 7 is used for extending in a writing state. The operation of the refill is interlocked, and the center core 7 is guided to the position of the central axis of the barrel 2 by the guiding member provided in the barrel 2, and becomes a protruding pen in a state substantially parallel to the aforementioned central axis. The state of the core.

In the present invention, the above-mentioned "the state of guiding to the central axis of the barrel 2 and the state of extending the refill in a state substantially parallel to the central axis" means that the core 7 and the shaft The inclination angle of the central axis of the cylinder 2 is within 5 degrees, preferably within 3 degrees, more preferably within 1.0 degrees, and is substantially guided to the position of the central axis of the barrel 2 to become an extended refill state. .

Hereinafter, the guide mechanism of the core 7 will be described.

Fig. 6 shows a front view, a right side view, and a left side of the enlarged center shaft 4 View, and a cross-sectional view of the B~B line of the aforementioned right side view.

In the inner wall 4a of the center shaft 4, the guide member is formed as a guide plate 4b composed of a plate-like body extending from the inner wall side of the center shaft 4 toward the central axis of the center shaft 4, and a guide plate having inclined sides is formed. 4b, integrally disposed on the inner wall 4a, the inclined side of one of the sides is extending from the inner wall side of the middle shaft 4 toward the center axis as the rear end side 4c of the plate-shaped body on the rear end side of the center shaft is closer to the shaft The front end side of the cylinder and the inclined side of the other side are formed in a stepped shape in the longitudinal direction of the center shaft 4, and the stepped portion is used as the locking portion 4e, which is along with the guide plate 4b. The plate-like body is located at the front end side 4d of the front end side of the bobbin, and extends from the inner wall side of the center shaft 4 toward the center axis, and is close to the front end side of the bobbin. The guide sheets 4b are provided corresponding to the respective cores 7, and in the present embodiment, the guide sheets 4b corresponding to the three cores 7 and from the inner wall 4a toward the central axis of the center shaft 4 are wait for The spacing is set around the circumference of the inner wall.

On the other hand, as shown in Fig. 11, the center core holding member 8 is provided with a guide sliding groove 8e that slides while guiding the guide plate 4b, and slidably engages with the guide plate 4b. Engagement hole 8f. In other words, the guide sliding groove 8e is provided on the upper surface of the main body 8a of the core holding member 8 from the rear end toward the front, and the front portion of the guiding sliding groove 8e is provided continuously with the guiding sliding groove 8e. 8a Engagement hole 8f penetrating in the up-and-down direction. The rear inner wall 8g of the aforementioned engaging hole 8f becomes inclined corresponding to the rear end side 4c of the guide plate 4b, and the front inner wall 8h has a stepped inclination corresponding to the front end side 4d of the guide plate 4b, and the step The shaped portion becomes the engaged portion 8i.

Fig. 2 is a central longitudinal sectional view showing a state in which the multi-core writing instrument 1 shown in an exploded perspective view of Fig. 1 is assembled. (a) shows the storage state of the core 7, (b) shows the state when the core 7 moves, and (c) shows the state in which the pen core is extended.

Fig. 3 is a partially enlarged view of the inside of a rectangle III indicated by a chain line in Fig. 2; Fig. 4 is an enlarged cross-sectional view taken along line IV-IV of Fig. 2. In the third and fourth figures, (a) shows the state in which the center core is stored, (b) shows the state in which the center core 7 moves, and (c) shows the state in which the pen core is extended.

As shown in Fig. 3, the cover portion 6 is fitted to the rear end of the spring stopper 12, and the front end of the spring stopper 12 is inserted at the rear end of the rear axle 5. The spring stopper 12 of the enlarged part drawing shown in Fig. 8 is provided with a spring locking hole 12a. The rear end of the tension spring 11 is locked to the spring locking hole 12a, and the front end is a locking hole 10d that is locked to the spring locking portion 10e of the pressing rod 10.

In the accommodated state of the core 7 shown in Fig. 3(a), the guide plate 4b and the engagement hole 8f of the core holding member 8 are engaged. In this engaged state, the locking portion 4e of the guide plate 4b is locked to the engaged portion 8i of the core holding member 8, and the position of the center core in the accommodated state is excellent.

Next, when the pressing operation portion 13 is slid in the distal end direction of the barrel 2 to be in a state in which the core 7 is extended, the core holding member 8 passes through the pressing rod 10 as shown in FIG. 3(b). And the link member 9 is pushed forward. With the movement of the core holding member 8 to the front, guiding The locking of the locking portion 4e of the plate 4b and the locked portion 8i of the core holding member 8 is released, but since the release, the center core 7 and the core holding member 8 are not inclined at the longitudinal direction of the barrel 2. The upper movement is prevented, so that the core holding member 8 of the aforementioned core 7 and the core holding member which is transferred from the extended pen core state to the center core of the accommodated state are prevented from colliding.

After the above-described locking is released, the center core holding member 8 moves forwardly, by the rear end side 4c of the guide plate 4b and the rear inner wall 8g of the engaging hole 8f on the core holding member 8. The sliding is gradually guided to the position of the central axis of the barrel 2.

In the state of the projecting refill of the core 7 shown in Fig. 3(c), the engagement of the guide plate 4b and the engaging hole 8f is released, and the guide plate 4b is located at the guide sliding of the core holding member 8. In the groove 8e, the center core 7 is guided to the central axis of the barrel 2, and is in a state of extending the refill in a state substantially parallel to the aforementioned central axis. In the state of the extended refill, the rear stop releasing piece 10g of the pressing bar 10 shown in Fig. 13 is locked and held in the state of the refilling state, similarly to the conventional push-type multi-core writing instrument. 7 position. Further, the vertical ridges provided in the vicinity of the front end opening portion 3a of the inner surface of the front shaft 3 shown in Fig. 5 have a function of preventing the bending of the core 7 at the time of writing.

Further, when the center core 7 in the state of extending the refill is returned to the stored state, the sliding operation portion of the other center core is slightly moved forward as in the normal case. The front of the core of the pressure bar 10 is released. 10f, the release piece 10g is stopped by the rear end of the pressing bar 10 of the core 7 which is in the state of extending the refill, and the locking is released. With this When released, the core 7 which is in the state of extending the refill is returned to the stored state by the action of the tension spring 11.

The present invention is not limited to the foregoing embodiments. For example, an engagement groove may be provided instead of the engagement hole 8f of the core holding member 8. Furthermore, it can be applied to a mechanical pencil, a stylus, etc., in addition to the outside of the ball pen. Moreover, the present invention is also applicable to a multi-core writing instrument of a rotating delivery-type.

1‧‧‧Multi-core pen

4b‧‧‧Guideboard

4c‧‧‧ rear end

4d‧‧‧ front side

4e‧‧‧ card stop

7‧‧‧SMIC

8‧‧‧Core holding member

8e‧‧‧ Guided sliding slot

8f‧‧‧ snap hole

8g‧‧‧ rear inner wall

8h‧‧‧ front inner wall

8i‧‧‧The locked part

9‧‧‧Connecting rod

10‧‧‧ Pressing bar

11‧‧‧ stretching spring

12‧‧‧Spring Brakes

13‧‧‧ Pressing the operation department

Claims (9)

A multi-core writing instrument capable of selectively protruding and retracting a core from an opening end of a shaft barrel, characterized in that: the selected core is interlocked with an operation for extending the refill in a writing state, The core is guided to the position of the central axis of the barrel by the guide member provided in the barrel, and is in a state of extending the refill in a state substantially parallel to the aforementioned center axis. The multi-core writing instrument of claim 1, wherein the multi-core writing instrument is in a state of being pushed out to extend the refill, and the pressing operation portion corresponding to each of the cores is directed toward the front end of the bobbin. Performing a sliding operation whereby the center core corresponding to the pressing operation portion subjected to the sliding operation is linked to the sliding operation, and the guiding member disposed in the barrel is guided to the position of the central axis of the barrel, in essence The state in which the upper portion is parallel to the aforementioned central axis becomes a state in which the refill is extended. A multi-core writing instrument according to claim 2, wherein the guiding member is disposed to correspond to each of the cores. The multi-core writing instrument of claim 1, 2, or 3, wherein a core holding member that detachably holds the core is provided, and the core holding member is guided by the guiding member, This causes the center core to be guided to the position of the central axis of the barrel. The multi-core writing instrument of claim 4, wherein the guiding member is formed as a guiding plate composed of a plate-like body extending from an inner wall side of the barrel toward a central axis of the barrel, and is configured to have a tilt Side guidance a sloping side extending from an inner wall side of the shaft cylinder toward a central axis along a rear end side of the plate-shaped body at a rear end side of the barrel, and close to a front end side of the barrel, and on the other hand, The core holding member is provided with an engaging hole or an engaging groove slidably engaged with the guide plate, and the pressing operation is performed in a state where the guiding plate is engaged with the engaging hole or the engaging groove. The sliding operation is performed in the front end direction of the shaft cylinder, and the core holding member is guided by the guide plate, and is guided to the position of the central axis of the barrel together with the center core, and is reset to the operation at the pressing operation portion. At the same time as the front position, the center core inserted in the core holding member is also reset to the position before the operation. The multi-core writing instrument of claim 4 or 5, wherein the guiding member is formed as a guiding plate composed of a plate-like body extending from an inner wall side of the barrel toward a central axis of the barrel The inclined side is formed in a stepped shape in the longitudinal direction of the barrel, and the stepped portion is used as a guiding plate of the locking portion, and the inclined side is located in the shaft barrel along with the plate-shaped body in the guiding plate The front end side of the front end side extends from the inner wall side of the bobbin toward the center axis, and is close to the front end side of the bobbin, and on the other hand, the locked portion of the locking portion can be locked on the core holding member. When the engagement hole or the engagement groove is provided in a state in which the center core is housed in the barrel, the locking portion of the guide plate can be locked to the locked portion of the core holding member. . The multi-core writing instrument of claim 5 or 6, wherein the guide sliding plate guides the sliding guide groove while sliding from the rear end toward the front in the form of the engaging hole or the engaging groove. , disposed on the upper side of the core holding member. The multi-core writing instrument of claim 4, 5, 6, or 7, wherein the pressing operation portion that protrudes toward the outside of the barrel is passed through a sliding slot punched in the wall portion of the barrel, and The pressing rods located in the barrel are coupled to each other, and the pressing rod or the pressing rod integrally formed with the pressing operation portion and the core holding member are coupled by a connecting rod member, and the connecting rod member is rotatable relative to the pressing rod or The pressing lever integrally formed by the pressing operation portion and the core holding member rotate together. The multi-core writing instrument of claim 8, wherein the tension spring is interposed between the rear end of the pressing rod and the inner rear end of the barrel, and is convex from the front end of the barrel by the operation of pressing the operation portion. The center core is returned to the position before the operation of the pressing operation portion by the action of the tension spring.