JP6812250B2 - Rotary feeding type writing tool - Google Patents

Description

The present invention relates to a rotary feeding type writing instrument in which a writing portion appears and disappears from a tip opening of a front shaft by rotating the rear shaft relative to the front shaft.

Various proposals have been made conventionally for a rotary feeding type writing instrument in which a writing portion appears and disappears from a tip opening by rotating a rear shaft relative to a front shaft.
This rotary feeding type writing instrument is provided with a tubular cam member interlocked with the rotation operation of the rear shaft and a slide member that moves in the axial direction by the cam member, and the refill is performed by the forward and backward movements of the slide member. The tip writing part operates so as to appear and disappear from the tip opening of the front shaft.

In the conventional rotary feeding type writing instrument of this kind, there is still much room for improvement in the rotation operation feeling of the rear shaft with respect to the front shaft, and the rotation operation with less weight (less torque feeling) is used. There are some products in which the tip writing part appears and disappears.
In addition, some products such as a slightly unpleasant rubbing sound or a metallic sound are generated at the meshing portion between the cam member and the slide member due to the rotation operation, and the operation feel is not accompanied by a profound feeling. It also has the problem of lacking luxury.
Therefore, a rotary feeding type writing tool has been proposed in which an O-ring is arranged between two members and an appropriate rotational resistance is given to the operation of the rear axle by the sliding resistance of the O-ring. It is disclosed in Document 1.

According to the rotary feeding type writing tool disclosed in Patent Document 1, an O-ring is attached to a slide member that moves in the axial direction by a rotational operation of the rear shaft, and this O-ring is one of the rotary feeding units arranged outside the O-ring. It is configured so that an appropriate sliding resistance is given to the rotation operation by sliding contact with the inner peripheral surface of the cylindrical member constituting the portion.
According to this configuration, the O-ring is in line contact over the entire circumference along the inner peripheral surface of the cylindrical member constituting the rotary feeding unit, and the O-ring sticks to the inner peripheral surface of the cylindrical member with the passage of time, and the tip is attached. There may be variations in the operational feeling of the haunting movement of the writing unit, which may lead to a problem that it is difficult to obtain a stable operational feeling.

Therefore, Patent Document 2 discloses a rotary feeding type writing tool that prevents the O-ring from making line contact over the entire circumference.
According to the writing tool disclosed in Patent Document 2, a configuration in which a part of the inner peripheral surface side of the rear axle is formed into a polygonal shape and an O-ring is arranged along the inner peripheral surface of the polygonal shape is adopted. ..
According to this configuration, the O-ring is arranged in contact with the polygonal inner peripheral surface of the rear axle, so that it is possible to avoid line contact of the O-ring along the inner peripheral surface of the rear axle over the entire circumference. it can. Therefore, it is possible to avoid the problem that the O-ring sticks to the inner peripheral surface of the rear shaft with the passage of time, which hinders the feeding operation of the tip writing portion.

Japanese Patent No. 5985332 Japanese Patent No. 4209383

By the way, according to the rotary feeding type writing tool disclosed in Patent Document 2, it is necessary to form a part of the inner peripheral surface of the rear shaft in contact with the O-ring into a polygonal shape. According to this, there are a portion where the inner peripheral surface of the rear shaft is formed into a cylindrical shape and a portion where the inner peripheral surface is formed into a polygonal shape in the axial direction, respectively. It has problems such as requiring complicated and special processing means.

Therefore, the problem to be solved by the present invention is that in a writing tool in which an O-ring is used to give a sliding resistance to the rotational feeding operation of the writing portion, the O-ring is mounted on the inner shaft side of the O-ring. Let's provide a rotary feeding type writing tool that can effectively prevent the O-ring from sticking along the inner peripheral surface of the outer shaft by providing an O-ring mounting portion that makes the outer peripheral surface non-circular. Is to be.

In one preferable form of the rotary feeding type writing tool according to the present invention, which has been made to solve the above-mentioned problems, a refill and a rotary feeding unit are housed in a shaft cylinder including a front shaft and a rear shaft, and the front shaft On the other hand, by rotating the rear axle relative to each other, the refill is moved forward and backward by the action of the rotary feeding unit, and the writing part of the refill is retracted from the tip opening of the front shaft. On the other hand, by rotating the rear shaft relative to each other, an inner shaft and an outer shaft that overlap and rotate relative to each other are further provided, and a ring-shaped member mounting portion made of a soft elastic body is formed on the inner shaft. The outer peripheral surface of the inner shaft forming the mounting portion is formed in a polygonal shape, and the inner surface of the outer shaft in contact with the outer peripheral portion of the ring-shaped member is formed in a cylindrical shape.

In this case, the ring-shaped member made of a soft elastic body means a member formed of an annular viscoelastic material represented by an O-ring or the like.
Further, it is desirable that the mounting portion of the ring-shaped member is formed of an annular accommodating groove, and the inner bottom portion of the accommodating groove has a polygonal shape.

Further, in another preferable form of the rotary feeding type writing tool according to the present invention, a refill and a rotary feeding unit are housed in a shaft cylinder composed of a front shaft and a rear shaft, and the rear shaft is relative to the front shaft. It is a rotary feeding type writing tool that moves the refill forward and backward by the action of the rotary feeding unit by rotating, and the writing part of the refill appears and disappears from the tip opening of the front shaft, and the rear shaft is relative to the front shaft. By rotating, an inner shaft and an outer shaft that overlap and rotate relative to each other are further provided, and a mounting portion formed by an annular accommodating groove on which a ring-shaped member made of a soft elastic body is mounted is formed on the inner shaft. At the same time, the accommodating groove constituting the mounting portion of the ring-shaped member is formed in a serpentine state along the circumferential direction.

The rotary feeding unit in each of the above-described embodiments includes a cam member that rotates integrally with the rear shaft, a slide member that moves in the axial direction by the axial rotation of the cam member to move the refill forward and backward, and the cam. A unit case arranged outside the member is provided, the cam member in the rotary feeding unit constitutes the inner shaft, and the unit case constitutes the outer shaft.

Further, there is also a form in which a cylindrical short shaft member is mounted on the inner peripheral surface of the rear end portion of the front shaft so that the rear shaft overlaps the short shaft member on the outside and rotates relative to the short shaft member. It can be adopted, and in this case, the short shaft member constitutes the inner shaft, and the rear shaft constitutes the outer shaft.

In addition, as the ring-shaped member, not only a circular cross-sectional shape orthogonal to the circumferential direction of the ring such as an O-ring, but also an X-shaped member or a combination of the above-mentioned shape can be adopted. Further, it is possible to preferably adopt a configuration in which a lubricant such as viscous grease is interposed between the ring-shaped member and the outer shaft in contact with the outer peripheral portion of the ring-shaped member. Can be done.

According to the rotary feeding type writing tool according to the present invention described above, since the outer peripheral surface of the inner shaft on which the ring-shaped member is mounted is formed in a polygonal shape, the ring-shaped member made of a soft elastic body is along the mounting portion of the inner shaft. Deforms moderately.
Therefore, the outer peripheral surface of the ring-shaped member is made non-circular, and it is possible to avoid line contact with the inner surface of the outer shaft over the entire circumference. Therefore, it is possible to avoid the problem that the ring-shaped member sticks to the outer shaft with the passage of time, which hinders the feeding operation of the cursive.
Moreover, since the above-mentioned action and effect can be obtained by processing the outer peripheral surface of the inner shaft into a polygonal shape, it is possible to provide a rotary feeding type writing tool that can easily process the mounting portion of the ring-shaped member. ..

It is a central sectional view which showed the whole structure about the 1st form of the rotary feeding type writing instrument which concerns on this invention. It is a front view of the cam member which comprises the rotary feeding unit. It is sectional drawing seen in the direction of an arrow from the line AA of FIG. 2A. It is a perspective view of a cam member. It is a front view of the slide member which comprises the rotary feeding unit. It is a perspective view of a slide member. It is a perspective view of the unit case which constitutes the outer shell of a rotary feeding unit. It is a perspective view of the stopper attached to the end of a unit case. It is a perspective view of the rotary feeding unit. It is a front view which showed the 2nd structural example of the cam member which comprises the rotary feeding unit. It is a vertical sectional view of the 2nd cam member. It is a perspective view of the 2nd cam member. It is a central sectional view which showed the whole structure about the 2nd form of the rotary feed-out type writing instrument which concerns on this invention. It is sectional drawing which showed the preferable example of the O-ring as a ring-shaped member.

Hereinafter, the rotary feeding type writing tool according to the present invention will be described based on the embodiment shown in the figure. 1 to 6 show the first form thereof, and first, the overall configuration thereof will be described with reference to FIG.

In this rotary feeding type writing tool, the axle cylinder 1 is composed of a front shaft 1A and a rear shaft 1B having substantially the same outer diameter, and the rear shaft 1B can rotate relative to the front shaft 1A. ing. A first mouth tip portion 3 and a second mouth tip portion 4 are attached to the front end portion of the front shaft 1A via a cylindrical connecting body 2, and an opening is provided in the conical first mouth tip portion 3. Is formed, which constitutes the tip opening 3a on the front shaft 1A side. Then, the writing portion (ballpoint pen tip) 5a of the ballpoint pen refill 5 housed in the barrel 1 can appear and disappear from the tip opening 3a.

Further, a coil-shaped return spring 6 is arranged between the ballpoint pen refill 5 and the first mouth tip portion 3, and the return spring 6 urges the ballpoint pen refill 5 in the retracting direction in the barrel 1. Has been done. The state shown in FIG. 1 shows a state in which the ballpoint pen refill 5 is advanced by the action of the rotary feeding unit 21 described later, and the writing portion (ballpoint pen tip) 5a protrudes from the tip opening 3a.

A tubular short shaft member 8 is screwed and attached to the inner surface of the rear end portion of the front shaft 1A, and a tubular sliding body 9 is attached to the inner surface of the front end portion of the rear shaft 1B described above. There is. Then, the sliding cylinder 9 attached to the rear shaft 1B is in sliding contact with the outer peripheral surface of the short shaft member 8, so that the rear shaft 1B can rotate relative to the front shaft 1A. ..
The front end portion of the unit case 24 constituting the rotary feeding unit 21 is screwed and attached to the short shaft member 8. The rotary feeding unit 21 will be described in detail later with reference to FIGS. 2 to 6.

The shaft body 12a of the crown member 12 is fitted and attached to the joint member 11 fitted and attached to a part of the cam member 22 of the rotary feeding unit 21 in the axial direction, and the crown member 12 is attached. A decorative ring 13 is attached to the periphery. Further, a fixing ring 14 is attached to the shaft body 12a of the crown member 12, and the crown member 12 and the fixing ring 14 are bent toward the center of the shaft formed at the rear end of the rear shaft 1B. The crown member 12 is fixed to the rear shaft 1B by sandwiching the portion.

Further, the base end portion of the clip 15 is inserted through the shaft body 12a of the crown member 12, and the clip 15 is closed by the clip spring 16 arranged on the shaft body 12a of the crown member 12, that is, The clip spring 16 is configured to keep the tip of the clip 15 in contact with the side surface of the rear shaft 1B.

2 to 5 show a simple substance configuration of each member constituting the rotary feeding unit 21 described above.
2A to 2C show a single configuration of the cam member 22, and the cam member 22 has a large-diameter cylindrical portion 22a in the front half portion and a small-diameter cylindrical portion 22b in the latter half portion. Further, as shown in FIG. 2B, a linear shaft hole 22c is formed in the central portion thereof.

A cam surface 22d is formed in the large-diameter cylindrical portion 22a in the first half in the axial direction over the half circumference thereof, and a recessed portion 22e that is recessed in the axial direction is formed at a position beyond the front end portion of the cam surface 22d. Has been done.
At the central portion of the cam member 22 in the axial direction, a mounting portion 22f of an O-ring 27 (shown in FIG. 1), which is a ring-shaped member whose diameter is reduced in a groove shape, is formed in an annular shape. The inner bottom portion of the mounting portion 22f is formed in a polygonal shape (the example shown in FIG. 2B is a regular hexagonal shape).
Then, a step portion is formed between the small diameter cylindrical portion 22b and the groove-shaped mounting portion 22f, and the annular sliding contact surface 22g formed on the step portion functions as a tail plug, which will be described later. It acts so as to be in sliding contact with the stopper 25.

3A and 3B show a single configuration of the slide member 23, and the slide member 23 moves in the axial direction by the rotation of the cam member 22 to move the refill 5 back and forth. To do.
Therefore, the front end portion of the slide member 23 is formed with a contact portion 23a having a large diameter and in contact with the rear end portion of the refill 5. Further, the front half portion of the slide member 23 is provided with a linear protruding portion 23b that protrudes in the radial direction and is formed slightly longer in the axial direction, and the rear end portion of the protruding portion 23b is the cam member 22. It constitutes a sliding contact portion 23c in contact with the cam surface 22d of the above.

A guide protrusion 23d that slightly protrudes in the radial direction is formed at the front end of the protrusion 23b, and the guide protrusion 23d is accommodated in the guide groove 24b of the unit case 24 described later. , Acts to move the slide member 23 only in the axial direction.
Further, the diameter of the latter half of the slide member 23 is reduced to form the rod portion 23e, and the rod portion 23e is housed in the shaft hole 22c formed in the small diameter cylindrical portion 22b of the cam member 22 described above. The slide member 23 acts so as to slide in the axial direction along the shaft hole 22c.

FIG. 4 shows a single configuration of the unit case 24, which is formed in a cylindrical shape, and the cam member 22 and the slide member 23 are housed in the space portion 24a inside the unit case 24. A guide groove 24b is formed along the axial direction on the side surface of the central portion in the axial direction, and the guide protrusion 23d of the slide member 23 described above is inserted into the guide groove 24b, so that the slide member 23 moves in the axial direction. It is supported so that it can be moved.
Further, a male screw 24c is formed on the outer peripheral surface of the front end portion of the unit case 24, and the male screw 24c is screwed into the female screw formed on the inner peripheral surface of the short shaft member 8 shown in FIG. 1 to rotate. The feeding unit 21 is attached to the front shaft 1A side.

FIG. 5 shows a stopper 25 that functions as a breech plug that is fitted and attached to the rear end portion of the unit case 24 described above.
The stopper 25 is formed in an annular shape, and a convex locking portion 25a fitted to the inner surface of the rear end portion of the unit case 24 is formed in an annular shape on the outer peripheral surface of the front end portion thereof. A positioning step portion 25b that comes into contact with the rear end portion end surface of the unit case 24 is formed at the rear end portion of the stopper 25.

Therefore, by attaching the stopper 25 to the rear end of the unit case 24 using the locking portion 25a, the annular front end surface 25c of the stopper 25 comes into contact with the sliding contact surface 22g formed on the cam member 22. The cam member 22 and the slide member 23 are brought into a state of being housed in the unit case 24.
Then, the small-diameter cylindrical portion 22b of the cam member 22 is arranged in a state of protruding toward the rear portion of the rotary feeding unit 21 through the shaft hole 25d formed in the stopper 25.

According to the rotary feeding type writing tool shown in FIG. 1, the shaft body 12a and the joint member 11 of the crown member 12 attached to the rear shaft 1B are formed by rotating the rear shaft 1B relative to the front shaft 1A. The cam member 22 of the rotary feeding unit 21 is rotated therethrough.
In this case, by rotating the rear shaft 1B relative to the front shaft 1A to the right, the cam surface 22d formed on the cam member 22 pushes the sliding contact portion 23c of the slide member 23 forward. Therefore, the slide member 23 pushes the ballpoint pen refill 5 forward by the contact portion 23a, and the writing portion (ballpoint pen tip) 5a protrudes from the tip opening 3a.

When the sliding contact portion 23c of the slide member 23 gets over the front end portion of the cam surface 22d, the sliding contact portion 23c falls into the recessed portion 22e following the cam surface 22d, whereby the writing portion (ballpoint pen tip) 5a becomes. , It is held in the state shown in FIG. 1 protruding from the tip opening 3a.
By rotating the rear shaft 1B relative to the front shaft 1A in this state, the sliding contact portion 23c of the slide member 23 gets over the front end portion of the cam surface 22d from the recessed portion 22e and reaches the cam surface 22d. Retreat along. This retracting operation is performed by the urging force of the return spring 6, whereby the writing portion (ballpoint pen tip) 5a is housed in the tip opening 3a.

In the rotary feeding unit 21 described above in this embodiment, an O-ring mounting portion 22f is formed on the outer peripheral surface of the cam member 22 by an annular groove, and the O-ring 27 is accommodated in the mounting portion 22f along the groove. Has been done.
Then, the unit case 24 is arranged on the outside of the cam member 22, and is arranged so that the outer peripheral portion of the O-ring 27 is in contact with the inner peripheral surface of the cylindrically configured unit case 24.

That is, the cam member 22 on which the mounting portion 22f of the O-ring is formed and the outer unit case 24 are overlapped with each other by rotating the rear shaft relative to the front shaft, so that the inner shaft rotates relative to the inner shaft ( The cam member 22) and the outer shaft (unit case 24) are in a relationship.
Therefore, the O-ring 27 is slidably contacted with the inner peripheral surface of the unit case 24 arranged outside the O-ring 27 so as to give an appropriate sliding resistance to the relative rotation operation of the rear shaft 1B with respect to the front shaft 1A. It works.

The O-ring 27 is formed of a soft elastic body such as silicon rubber, and the cross-sectional shape orthogonal to the circumferential direction of the ring is substantially circular. The O-ring 27 is mounted on a mounting portion 22f whose inner bottom has a polygonal shape (the example shown in FIG. 2B has a regular hexagonal shape), whereby the outer peripheral surface of the O-ring 27 has a polygonal shape of the mounting portion 22f. It deforms moderately along the inner bottom of the shape. Therefore, the outer peripheral surface of the O-ring 27 is made non-circular, and the O-ring 27 can avoid line contact with the inner surface of the unit case 24 as the outer shaft over the entire circumference.
Therefore, it is possible to avoid the problem that the O-ring 27 sticks to the inner peripheral surface of the outer shaft (unit case 24) with the passage of time, which hinders the feeding operation of the cursive.

According to this embodiment, the mounting portion 22f of the O-ring 27 can obtain the above-mentioned action and effect by processing the outer peripheral surface of the cam member 22 as an inner shaft into a polygonal shape. The processing of 22f can also be facilitated.
It is desirable that the mounting portion 22f of the O-ring 27 formed on the outer peripheral surface of the inner shaft has a regular pentagon to a regular hexadecagon.

Further, the mounting portion 22f of the O-ring 27 is filled with a lubricant such as viscous grease so that the grease is interposed between the O-ring 27 and the outer shaft (unit case 24). It is desirable to configure it in. In particular, in this embodiment, the mounting portion 22f of the O-ring 27 is formed into a polygonal shape so that a grease pool can be formed with the O-ring.
This grease is interposed between the O-ring 27 and the outer shaft (unit case 24) to appropriately adjust the frictional resistance between the two, suppress the generation of clicking noise and sliding noise, and perform the rotary feeding operation. Can contribute to giving a profound feeling and a sense of quality.

7A-7C show other preferred examples of cam members constituting the rotary feeding unit 21. The cam member 22A shown in FIGS. 7A to 7C has the same basic configuration as the cam member 22 shown in FIGS. 2A to 2C, and parts that perform the same function are indicated by the same reference numerals, and detailed description thereof will be given. Is omitted.
The cam member 22A shown in FIGS. 7A to 7C has an O-ring accommodating groove that functions as a mounting portion 22h of the O-ring that is a ring-shaped member, and is formed in a meandering state along the circumferential direction of the cam member 22A. There is. Therefore, the O-ring 27 is arranged along the accommodating groove as the meandering mounting portion 22h.

Even when the cam member 22A shown in FIGS. 7A to 7C is used, the inner shaft (cam member 22A) and the outer shaft (unit) that overlap and rotate relative to each other are similar to the rotary feeding unit 21 shown in FIG. A case 24) is provided, and an O-ring is mounted on the inner shaft (cam member 22A) side.
Therefore, by filling the mounting portion 22h of the O-ring with grease in the same manner, the grease can be spread along the axial direction by the rotation of the meandering O-ring 27.
As a result, it is possible to effectively avoid the problem that the O-ring sticks to the inner peripheral surface of the rear shaft with the passage of time, which hinders the feeding operation of the tip writing portion.

FIG. 8 is a central sectional view showing a second form of the rotary feeding type writing instrument according to the present invention.
The rotary feeding type writing instrument of the second form has the same basic configuration as the rotary feeding type writing instrument shown in FIG. 1, and the portions performing the same functions are indicated by the same reference numerals. Therefore, detailed description will be omitted.
Since the structure of the rotary feeding unit 21 in FIG. 8 is the same as that shown in FIG. 1, the cross-sectional structure thereof is not shown. However, the location of the O-ring 27 mounted in the rotary feeding unit 21 is arranged between the short shaft member 8A and the rear shaft 1B instead of in the rotary feeding unit 21.

In the configuration shown in FIG. 8, a short shaft member 8A formed to be slightly thicker than the short shaft member 8 shown in FIG. 1 is used. Then, a groove-shaped O-ring mounting portion is formed along the outer peripheral surface of the short shaft member 8A, and the O-ring 27 is mounted in the groove.
The inner bottom portion of the annular groove, which is the mounting portion of the O-ring 27, is formed in a regular hexagonal shape as shown in the cross-sectional view of the arrangement position of the O-ring in FIG. Along the inner bottom of the shape, its outer circumference is non-circular.
The outer peripheral portion of the O-ring 27 is intermittently in contact with the inner surface of the sliding body 9 mounted in the rear shaft 1B along the circumferential direction.

As a result, the short shaft member 8A is mounted on the inner peripheral surface of the rear end portion of the front shaft 1A and the O-ring 27 is mounted, and the rear shaft 1B overlaps the short shaft member 8A on the outside and rotates relative to the shaft. , The O-ring 27 is configured to slide on the rear axle 1B.
Therefore, the O-ring 27 is in sliding contact with the inner peripheral surface of the rear shaft 1B (sliding body 9) arranged on the outside thereof, so that the O-ring 27 has an appropriate sliding resistance for the relative rotation operation of the rear shaft 1B with respect to the front shaft 1A. Acts to give.
Also in this configuration, as in the configuration shown in FIG. 1, by filling the mounting portion of the O-ring 27 with the annular groove with grease, the grease appropriately adjusts the frictional resistance of the O-ring, and the rotation shown in FIG. It is possible to obtain the same effect as that of the pay-out type writing tool.

In the rotary feeding type writing tool described above, an O-ring having a circular cross-sectional shape orthogonal to the circumferential direction of the ring is used, but instead, as shown in FIG. 9, it is orthogonal to the circumferential direction of the ring. An O-ring 27A (X-ring) having an X-shaped cross section can be preferably used.
According to the O-ring 27A having the configuration shown in FIG. 9, since the contact pressure is dispersed, the degree of the O-ring sticking to the inner peripheral surface of the outer shaft can be further reduced with the passage of time.
Therefore, by using the O-ring 27A having an X-shaped cross section, the above-mentioned action and effect of the rotary feeding type writing instrument according to the present invention can be further enhanced.

1 Axle cylinder 1A Front shaft 1B Rear shaft 3 1st mouth tip 3a Tip opening 4 2nd mouth tip 5 Refill 5a Writing part 6 Return spring 8,8A Short shaft member 9 Sliding body 11 Joint member 12 Crown member 12a Shaft body 14 Fixing ring 15 Clip 16 Clip spring 21 Rotational feeding unit 22 Cam member 22a Large diameter cylindrical part 22b Small diameter cylindrical part 22d Cam surface 22f, 22h Mounting part 23 Slide member 23c Sliding contact part 23d Guide protrusion 24 Unit case 24b Guide groove 24c Male screw 25 Stopper 27, 27A O-ring (ring-shaped member)

Claims (5)

A refill and a rotary feeding unit are housed in an axle cylinder composed of a front shaft and a rear shaft. By rotating the rear shaft relative to the front shaft, the refill is moved forward and backward by the action of the rotary feeding unit to refill. It is a rotary feeding type writing tool that makes the writing part of the above appear and disappear from the tip opening of the front axle.
By rotating the rear shaft relative to the front shaft, an inner shaft and an outer shaft that overlap and rotate relative to each other are further provided.
A mounting portion of a ring-shaped member made of a soft elastic body is formed on the inner shaft, and the outer peripheral surface of the inner shaft forming the mounting portion is formed in a polygonal shape and is formed on the outer peripheral portion of the ring-shaped member. A rotary feeding type writing tool characterized in that the inner surface of the outer shaft in contact is formed in a cylindrical shape. The rotary feeding type writing tool according to claim 1, wherein the mounting portion of the ring-shaped member is formed of an annular accommodating groove, and the inner bottom portion of the accommodating groove has a polygonal shape. A refill and a rotary feeding unit are housed in an axle cylinder composed of a front shaft and a rear shaft. By rotating the rear shaft relative to the front shaft, the refill is moved forward and backward by the action of the rotary feeding unit to refill. It is a rotary feeding type writing tool that makes the writing part of the above appear and disappear from the tip opening of the front axle.
By rotating the rear shaft relative to the front shaft, an inner shaft and an outer shaft that overlap and rotate relative to each other are further provided.
A mounting portion is formed on the inner shaft by an annular accommodating groove in which a ring-shaped member made of a soft elastic body is mounted, and the accommodating groove constituting the mounting portion is in a state of meandering along the circumferential direction. A rotary feeding type writing tool characterized in that it is formed. The rotary feeding type writing tool according to any one of claims 1 to 3, wherein the ring-shaped member has an X-shaped cross-sectional shape orthogonal to the circumferential direction of the ring. The method according to any one of claims 1 to 4, wherein grease is interposed between the ring-shaped member and the outer shaft in contact with the outer peripheral portion of the ring-shaped member. Rotating pay-out type writing tool.

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