JP2016168747A - Rotational delivery type writing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotational delivery type writing instrument in which assemblability is improved and slenderness is enabled.SOLUTION: A rotational delivery type writing instrument is provided in which an advancing slide piece 20 is locked to a locking recess 72c in the front end side of an inclined face so that a writing part in the front end of a refill 40 is maintained in a projecting state. The slide piece 20 includes an engaging recess 22 to be engaged with the rear end side of a refill support shaft 30. The engaging recess 22 is formed into a recessed shape into which the refill support shaft 30 is inserted from the approximately orthogonal direction with respect to the refill support shaft 30.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a rotary feeding type writing instrument in which a writing part at the front end of a refill is made to appear and disappear by an operation of rotating a rotary cam.

Conventionally, in this type of writing instrument, as described in Patent Document 1, for example, a shaft tube (10), a slide piece (21) that slides in the front-rear direction within the shaft tube, and forward from the slide piece. A protruding refill support shaft (spacer member 21c), refills (31, 32) connected to the front end side of the refill support shaft, and an annular attachment to the refill support shaft, the refill support shaft and the slide piece are connected to each other. A coil spring (biasing member 40) that urges the shaft cylinder rearward, a guide middle piece (member around the spacer member 21c) that guides the slide piece and the refill support shaft in the longitudinal direction in the shaft cylinder, and the shaft cylinder There is a rotary feeding-type writing instrument provided with a rotating cam (50) for causing the slide piece to move forward by sliding the inclined surface rotating relative to the guide middle piece to the slide piece.
In this prior art, the slide piece has a round hole, and the refill support shaft is inserted into the round hole and fitted over and fixed in the round hole. In addition, the guide middle piece has a bottomed hole for inserting the refill support shaft from the front, and a window hole for projecting the slide piece to the side wall on the rear side of the bottomed hole. Had.

By the way, in the assembling method of the conventional rotary pay-out type writing instrument, the slide piece and the coil spring are mounted in advance in the bottomed hole of the guide middle piece, and this state is maintained from the front with respect to the bottomed hole. After inserting the refill support shaft and inserting the rear end side of the refill support shaft into the coil spring, the refill support shaft is further inserted into the round hole of the slide piece and fitted over the round hole.
For this reason, it is difficult to hold the state where the slide piece and the coil spring are mounted on the guide middle piece, or it is difficult to insert the rear end side of the refill support shaft into the coil spring or the slide piece. There were difficulties in assembling work. In particular, when the entire writing instrument is further slimmed down, the above-mentioned difficulty in assembling becomes remarkable, and improvement is required.
Further, when the refill support shaft is fitted over the round hole of the slide piece, the slide piece expands elastically. Therefore, it is necessary to set the inner diameter of the bottomed hole in the guide middle piece large beforehand. Yes, this also contributed to the obstruction of the entire writing instrument.

JP 2009-154458 A

  The present invention has been made in view of the above-described conventional circumstances, and a problem to be solved by the present invention is to provide a rotary pay-out type writing instrument that can improve assemblability and can be thinned.

  One means for solving the above-mentioned problem is provided with a slide piece that slides within the shaft cylinder, and a refill support shaft that protrudes forward from the slide piece, and the slide piece and the refill support shaft are rotated by rotation of a rotating cam. In the rotary feeding type writing instrument that is advanced to project the refill writing portion supported by the refill support shaft from the front end of the shaft cylinder, the slide piece is fitted to the rear end side of the refill support shaft. A mating recess is provided, and the fitting recess is formed in a concave shape into which the refill support shaft can be inserted from a direction substantially orthogonal to the refill support shaft.

  Since the present invention is configured as described above, it is possible to improve the assemblability and to make the rotary feeding type writing instrument thinner.

It is an internal structure figure which shows an example of the rotation payout type writing instrument which concerns on this invention. It is a side view which shows an example of a refill support shaft. An example of a slide piece is shown, (a) is a side view, (b) is a left side view with respect to (a), (c) is a top view with respect to (a), and (d) is a bottom view with respect to (a). It is a side view which shows the state which is going to fit a slide piece with respect to a refill support shaft. It is sectional drawing which follows the (V)-(V) line | wire in FIG. 4, (a) and (b) show the state before and after mounting | wearing a refill support shaft with a slide piece. It is a side view showing an example of a guide middle piece. It is the figure which looked at the same piece in the guide from the front. It is sectional drawing which follows the (VIII)-(VIII) line | wire in FIG. It is sectional drawing which follows the (IX)-(IX) line | wire in FIG. The state which is going to mount | wear with a support shaft unit with respect to a middle piece of a guide is shown, and a middle piece of a guide is a (X)-(X) line cross section in FIG. It is a side view which shows an example of a rotation cam. It is sectional drawing which follows the (XII)-(XII) line | wire in FIG.

A first feature of the present embodiment is provided with a slide piece that slides within the shaft cylinder, and a refill support shaft that protrudes forward from the slide piece, and the slide piece and the refill support shaft are rotated by rotation of a rotating cam. In the rotary feeding type writing instrument that is advanced to project the refill writing portion supported by the refill support shaft from the front end of the shaft cylinder, the slide piece is fitted to the rear end side of the refill support shaft. A mating recess is provided, and the fitting recess is formed in a concave shape into which the refill support shaft can be inserted from a direction substantially orthogonal to the refill support shaft (see FIGS. 3 to 5).
According to this configuration, the slide piece can be connected to the refill support shaft from a substantially perpendicular direction, the assemblability is good, and the slide piece can be reduced in size. Can be slender.

  As a second feature, in order to further improve the assemblability, the fitting recess sets the width of the opening edge for inserting the refill support shaft smaller than the outer diameter of the refill support shaft. The width on the back side of the opening edge is set larger than the width of the opening edge, the opening edge is elastically expanded, and the refill support shaft is inserted into the opening edge. (See FIG. 3).

As a third feature, the refill support shaft includes a fitting shaft portion and a rib protruding from an outer wall surface of the fitting shaft portion, and the fitting recess is inserted from the opening edge portion. The shaft portion is fitted into the recess main body on the back side of the opening edge portion, and the rib is fitted to the opening edge portion (see FIG. 5).
According to this configuration, the rib of the refill support shaft is fitted to the opening edge of the fitting recess in a state in which the fitting shaft portion of the refill support shaft is fitted to the recess main body of the fitting recess. For this reason, it is possible to prevent the slide piece from being deformed so as to narrow the opening edge due to the pressing force received from the rotating cam, and as a result, the durability of the connection portion between the refill support shaft and the slide piece. In addition, the connection portion can be further slimmed.

  Further, the following embodiments also disclose a method of manufacturing a rotary payout type writing instrument including a step of fitting the fitting recess of the slide piece from a direction substantially orthogonal to the refill support shaft.

Next, a preferred embodiment having the above features will be described in detail with reference to the drawings.
In the present specification, “front” means the tip direction of the writing part (ballpoint pen tip 42), and “back” means the opposite direction. Further, the “outer diameter direction” means a direction away from the central portion in the radial direction of the shaft cylinder of the writing instrument, and the “inner diameter direction” means the opposite direction.

FIG. 1 shows an example of a rotary pay-out writing instrument according to the present invention.
The rotary feeding type writing instrument A includes a shaft tube 10, a slide piece 20 that slides in the front-rear direction within the shaft tube 10, a refill support shaft 30 connected to the front end side of the slide piece 20, and the refill support shaft 30. A refill 40 connected to the front end side of the front end, a coil spring 50 which is annularly mounted on the refill support shaft 30 and urges the refill support shaft 30 and the slide piece 20 to the rear of the shaft cylinder, and slides within the shaft cylinder 10. A guide middle piece 60 that guides the piece 20 and the refill support shaft 30 in the front-rear direction, and an upward inclined surface 72 a (see FIG. 11) that rotates relative to the guide middle piece 60 in the shaft cylinder 10 are in sliding contact with the slide piece 20. And a rotating cam 70 for moving the slide piece 20 forward, and the slide piece 20 at the time of advancement is locked to the locking recess 72c on the front end side of the upward inclined surface 72a. 0 configured to maintain the projecting state writing portion of the front end (the ball-point pen tip 42).

  The shaft cylinder 10 is formed as a single cylinder from a front shaft 11, a support cylinder 12 connected to the rear side of the front shaft 11, and a rear shaft 13 rotatably connected to the rear side of the support cylinder 12. It is formed.

  The front shaft 11 is formed in a substantially cylindrical shape penetrating the center portion in the front-rear direction, and a front end portion thereof is formed in a tapered shape, and an opening 11 a for protruding and retracting the refill 40 is formed in the foremost end portion.

The support cylinder 12 is a substantially cylindrical member in which the front half side is inserted into the rear side of the front shaft 11 with the rear half side protruding backward.
The front half of the support cylinder 12 is fitted to the front shaft 11 so that it can be inserted and removed and cannot be rotated. For example, when replacing the refill 40 in the shaft tube 10, the support tube 12 is pulled backward with respect to the front shaft 11.
Further, the rear half side of the support cylinder 12 is inserted into the front end side of the rear shaft 13, and supports the rear shaft 13 so as to be rotatable.
That is, the rear shaft 13 is supported by the rear half side of the support cylinder 12, and can rotate with respect to the front shaft 11 and the support cylinder 12. A clip portion 13 a is provided on the outer periphery of the rear end side of the rear shaft 13. A rotating cam 70 is fitted inside the rear end of the rear shaft 13 so as to be integrally rotatable.

  The slide piece 20 includes an engaging portion 21 that engages with the rotating cam 70 and a fitting recess 22 that is fitted to the rear end side of the refill support shaft 30 (see FIG. 3).

  The engaging portion 21 is formed in a mountain shape with the rear portion as the top portion 21a, and moves by sliding the portion on the top portion 21a side to the upward inclined surface 72a and the downward inclined surface 72b (see FIG. 11) of the rotating cam 70. The peripheral surface portion 21 b of the engaging portion 21 is in sliding contact with the inner peripheral surface of the rear shaft 13.

The fitting recess 22 is formed in a concave shape that fits in a direction substantially orthogonal to the refill support shaft 30.
More specifically, the fitting recess 22 includes an opening edge portion 22a for inserting the refill support shaft 30 and an outer peripheral portion of the refill support shaft 30 inserted from the opening edge portion 22a. A cylindrical recess 22b fitted to the shaft portion 32a), and the opening edge 22a is elastically expanded so that the refill support shaft 30 is inserted into the cylindrical recess 22b in the opening edge 22a. is there

The opening edge 22a has a width dimension w (see FIG. 3) set so as to fit into one of the two ribs 32b and 32b (see FIGS. 4 and 5) of the refill support shaft 30.
The cylindrical concave portion 22b is a substantially cylindrical concave portion provided on the back side of the opening edge portion 22a. The inner diameter of the cylindrical recess 22b is set larger than the width w of the opening edge 22a.
In addition, a recess 22c is provided on the inner wall surface on the back side of the cylindrical recess 22b so as to be fitted to the other of the two ribs of the refill support shaft 30.

  The refill support shaft 30 has a refill connection portion 31 connected to the rear end side of the refill 40 on the front end side of the long cylindrical shaft body 30a, and the slide piece 20 is fitted on the rear end side. It has the piece connection part 32 (refer FIG. 4).

The refill connection portion 31 is formed in a cylindrical shape that can be inserted into the rear end side of the refill 40. Vertical ribs 31 a are provided on the outer peripheral surface of the refill connection portion 31 at intervals in the circumferential direction. These vertical ribs 31 a are pressed against the inner wall surface of the refill 40.
An annular flange 31 b is provided on the rear end side of the refill connection portion 31. The annular flange 31b contacts the rear end portion of the refill 40.

  The piece connecting portion 32 includes a fitting shaft portion 32a that fits into the cylindrical recess 22b of the slide piece 20, and two ribs 32b and 32b that protrude from the outer wall surface of the fitting shaft portion 32a and extend in the front-rear direction. As other examples of the rib 32b, a rib extending in a direction intersecting the front-rear direction, a rib having a shape other than the illustrated example, or the like can be used.

As shown in FIGS. 4 and 5, the fitting shaft portion 32 a is a substantially shaft-shaped portion formed by partially reducing the diameter of the rear end side of the refill support shaft 30.
On the outer periphery of the fitting shaft portion 32a, flat surface portions 32a1 and 32a1 (see FIG. 5) are provided substantially in parallel on both sides in the direction orthogonal to the insertion direction to the slide piece 20. These flat surface portions 32a1 and 32a1 reduce resistance when the fitting shaft portion 32a is inserted into the fitting concave portion 22 of the slide piece 20, and facilitate the insertion operation.

The two ribs 32b and 32b are provided on the outer peripheral portion of the fitting shaft portion 32a on the insertion direction side with respect to the slide piece 20 and on the opposite side thereof (see FIG. 5). One rib 32 b fits into the opening edge 22 a in the slide piece 20. Further, the other rib 32b fits into the recess 22c on the back side of the cylindrical recess 22b in the slide piece 20.
In the preferred example of the present embodiment, the two ribs 32b are provided as described above in order to eliminate the directionality during assembly and improve the productivity. However, as another example, it corresponds to the recess 22c. It is possible to omit one of the ribs 32b and the recess 22c.

  The refill 40 is a ballpoint penfill formed by connecting a ballpoint pen tip 42 to the front end side of the long cylindrical ink storage tube 41.

  The coil spring 50 is a metal compression coil spring, and is annularly mounted on the rear side of the annular flange portion 31 b in the refill support shaft 30. The rear end portion of the coil spring 50 is received by the front end portion of the slide piece 20 mounted on the rear end side of the refill support shaft 30.

The slide piece 20, the refill support shaft 30, and the coil spring 50 are configured as an integral support shaft unit 1 (see FIG. 10).
More specifically, in the support shaft unit 1, a coil spring 50 is annularly mounted on the rear side of the annular flange 31 b in the refill support shaft 30, and the slide piece 20 is disposed on the rear side of the coil spring 50 in the refill support shaft 30. Are integrated so as not to separate.

The guide middle piece 60 is a long member inserted on the rear side in the rear shaft 13. The front end side of the guide middle piece 60 is fixed to the rear end side of the support cylinder 12 (see FIG. 1). Further, the guide middle piece 60 is rotatably fitted to the rotary cam 70 integrated with the rear shaft 13. Therefore, if the rear shaft 13 is rotated relative to the front shaft 11, the rotary cam 70 rotates in the rear shaft 13 relative to the guide middle piece 60.
A plurality of concave guide grooves 61 into which the support shaft unit 1 can be inserted from a direction substantially orthogonal to the axial direction of the shaft cylinder are provided on the outer periphery of the guide middle piece 60.
Further, on the rear end side of the guide middle piece 60, an engagement protrusion 62 protrudes backward (see FIG. 6). The engagement protrusion 62 is fitted to the rotary cam 70 so as to be rotatable.
A refill guide piece 63 that slides on the side surface of the refill 40 and guides the advancement and retraction of the refill 40 is provided in front of the guide groove 61 in the guide middle piece 60.

The guide groove 61 includes a groove body 61a that continues in the front-rear direction and a locking protrusion 61b that is located on the front end side of the groove body 61a.
A wall-shaped receiving portion 61 a 1 that receives the rear end portion of the refill support shaft 30 is provided at the rear end portion of the guide groove 61.
Further, the front side of the guide groove 61 is opened so that the support shaft unit 1 is inserted (see FIG. 7).
The guide groove 61 is located on the rear side of the refill connection portion 31 of the support shaft unit 1 and includes a portion including the entire coil spring 50 into the groove main body 61a from a direction substantially perpendicular to the axial direction of the shaft cylinder. Then, the slide piece 20 and the refill support shaft 30 are fitted so as to be able to advance and retreat, and the front end edge of the coil spring 50 is locked by the locking protrusion 61b (see FIG. 10).

  The groove main body 61a is a groove having a substantially U-shaped cross section having an opening on the side, and is continuous in the longitudinal direction in the front-rear direction (see FIGS. 6, 9, and 10). The groove main body 61a is formed in the shape of the outer surface of the slide piece 20 on the fitting concave portion 22 side, and according to an example shown in FIG.

  The locking protrusion 61b is a protrusion having a concave cross section that protrudes inward from the inner wall on the front end side of the groove body 61a, and the shaft body 30a of the refill support shaft 30 is inserted into the protrusion body 61b with play. The rear end surface of the locking projection 61b contacts the front end portion of the coil spring 50.

  In the guide groove 61, the portion having the locking projection 61b is set such that the dimension B on the opening edge side is smaller than the dimension A on the inner side and the outer diameter of the shaft body 30a as shown in FIG.

As shown in FIG. 10, when the support shaft unit 1 is inserted into the guide groove 61 of the guide middle piece 60, the front end side of the coil spring 50 is contracted by a jig or the like, and the front end portion of the coil spring 50 is connected to the locking projection 61b. While being locked to the rear end surface, the portion of the dimension B in the guide groove 61 is elastically expanded by the refill support shaft 30, and the support shaft unit 1 is fitted into the guide groove 61. Although FIG. 10 shows a state in which only the right coil spring 50 is contracted, the left coil spring 50 is contracted in the same manner.
The middle guide piece 60 and the two support shaft units 1 and 1 are configured as an integral unit.

  Further, the engagement protrusion 62 (see FIG. 10) is a protrusion that protrudes rearward from the plurality of guide grooves 61 in the guide middle piece 60. An annular constricted portion 62a having a diameter smaller than that of the front side is provided on the proximal end side of the engaging projection 62. The rotary cam 70 is fitted into the constricted portion 62a in an annular shape. The rotating cam 70 freely rotates on the outer periphery of the constricted portion 62a.

Further, the refill guide piece 63 is a protruding piece that protrudes forward from the locking protrusion 61 b in the guide middle piece 60. The refill guide pieces 63 are provided as a pair so as to approach or come into contact with the refill 40 fitted to the front end side of the refill support shaft 30 from both sides in the radial direction (see FIG. 7). The refill guide piece 63 guides the refill 40 in the front-rear direction when the refill 40 is attached to or detached from the refill support shaft 30 or when the refill 40 is advanced or retracted.
As another example, the refill guide piece 63 can be omitted.

  The rotating cam 70 includes a substantially cylindrical tube portion 71 and a cam body 72 that protrudes in a substantially mountain shape from the front end of the tube portion 71 (see FIGS. 11 and 12). And are engaged so as to rotate.

The cylindrical portion 71 is formed in a substantially cylindrical shape that follows the inner peripheral surface of the rear shaft 13. On the inner wall surface of the cylindrical portion 71, an annular support protrusion 71a protruding in the radially inward direction and a female screw portion 71b on the rear side of the annular support protrusion 71a are provided.
The guide middle piece 60 is rotatably fitted to the annular support protrusion 71a.
The tail plug 14 (see FIG. 1) is screwed to the female screw portion 71b. The tail plug 14 sandwiches the base portion of the clip portion 13 a between the rear end portion of the rotary cam 70.

  As shown in FIG. 11, the cam body 72 has an upward inclined surface 72a that slides the slide piece 20 diagonally forward on one side in the rotational direction, and a downward slope that slides the slide piece 20 diagonally backward on the other side in the rotational direction. A surface 72b, a locking recess 72c that fits into the slide piece 20 between the ascending inclined surface 72a and the descending inclined surface 72b, and a rotation extending rearward along the axial direction from the rear end of the descending inclined surface 72b. And a regulating surface 72d.

According to this cam body 72, when the rotating cam 70 rotates in one direction relative to the guide middle piece 60, the slide piece 20 slides on the upward inclined surface 72a and moves obliquely forward, and then enters the locking recess 72c. Locked. Then, when the rotating cam 70 further rotates in the one direction, the slide piece 20 is detached from the locking recess 72c, slides on the descending inclined surface 72b and moves obliquely rearward, and then moves rearward along the rotation restricting surface 72d. Moving.
In addition, when the rotary cam 70 is to be rotated in the reverse direction, the slide piece 20 comes into contact with the rotation restricting surface 72d substantially perpendicularly, so that the rotation in the reverse direction can be prevented.

Next, characteristics of the manufacturing method in the rotary feeding type writing instrument A having the above configuration will be described.
When the support shaft unit 1 is assembled, first, the coil spring 50 is annularly attached to the rear portion of the refill support shaft 30 from the annular flange 31b.
Next, on the rear side of the coil spring 50 in the refill support shaft 30, the slide piece 20 is fitted to the refill support shaft 30 from a substantially perpendicular direction (see FIG. 4).
If it demonstrates in detail, it will fit so that the piece connection part 32 of the refill support shaft 30 may be inserted in the fitting recessed part 22 of the slide piece 20 (refer FIG. 5).
At this time, the fitting recess 22 of the slide piece 20 is elastically expanded by the insertion of the piece connecting portion 32. And the fitting shaft part 32a of the piece connection part 32 fits into the cylindrical recessed part 22b of the fitting recessed part 22, and at the same time, one rib 32b of the fitting shaft part 32a fits into the recessed part 22c of the slide piece 20, Furthermore, the other rib 32 b of the fitting shaft portion 32 a fits into the opening edge portion 22 a of the fitting recess 22.

Therefore, the rib 32b can prevent the slide piece 20 from being deformed so as to narrow the space between the opening edge portions 22a due to a pressing force received from the rotary cam 70 or the like.
Moreover, since the slide piece 20 is fitted from the orthogonal direction to the refill support shaft 30, for example, compared to the conventional technique in which the refill support shaft is moved axially rearward and fitted to the slide piece. It is easy to assemble and can be made into a slim shape.

Further, when the support shaft unit 1 is assembled to the guide middle piece 60, as shown in FIG. 10, the support shaft unit 1 from a direction substantially orthogonal to the axial tube axis direction with respect to the guide groove 61 of the guide middle piece 60. Can be inserted, and the assemblability is good.
In addition, for example, in the prior art in which the refill support shaft is inserted from the front side of the shaft cylinder with respect to the slide piece previously mounted on the guide middle piece, the slide piece is elastically fitted into the guide middle piece for fitting or the like. It is necessary to secure a space for deformation, but in the present invention, since the space can be made unnecessary, it is possible to make the shape thinner.
Further, since the guide middle piece 60 and the two support shaft units 1 and 1 are configured in an integrated unit shape so as not to be easily separated (see FIG. 10), Parts management is also easy.

  Further, when the refill 40 is removed forward from the refill support shaft 30 in order to replace the refill 40, a force in the direction of coming out of the slide piece 20 acts on the refill support shaft 30, but the refill support shaft 30 is fitted. Since the rear end portion of the slide piece 20 abuts against the rear end wall (see FIG. 4) of the concave portion constituting the shaft portion 32a, the refill support shaft 30 is prevented from being pulled out from the slide piece 20. Can do.

  In addition, according to the rotary feeding type writing instrument A of the illustrated example, the two refills 40 are selectively made to appear and appear. However, as other examples, the aspect in which one refill 40 is made to appear and three or more It is also possible to make the refill 40 appear and disappear.

  Further, according to the illustrated example, the plurality of refills 40 are all ballpoint pen refills. However, as another example, the plurality of refills 40 may be a combination of a ballpoint pen refill, a mechanical pencil refill, an input pen, or the like. Is also possible.

  In addition, according to the illustrated example, the cam body 72 has a left-right asymmetric shape having a rotation restricting surface 72d and can be rotated in only one direction, so that the entire rotating cam 70 is formed thin. For example, the cam body 72 may be formed in a symmetrical mountain shape so that it can be rotated in both directions.

1: support shaft unit 10: shaft cylinder 20: slide piece 21: engagement portion 22: fitting recess 22a: opening edge portion 22b: cylindrical recess 30: refill support shaft 31: refill connection portion 32: piece connection portion 32a: Fitting shaft portion 32b: rib 40: refill 50: coil spring 60: guide middle piece 61: guide groove 61b: locking projection 70: rotating cam 72: cam main body 72c: locking recess A: rotation feeding type writing instrument

Claims (3)

A slide piece that slides within the shaft cylinder and a refill support shaft that protrudes forward from the slide piece, and is supported by the refill support shaft by advancing the slide piece and the refill support shaft by rotation of a rotating cam. In the rotary payout-type writing instrument in which the writing part of the refill is projected from the front end of the shaft cylinder,
The slide piece is provided with a fitting recess that fits on the rear end side of the refill support shaft, and the fitting recess is formed in a concave shape into which the refill support shaft can be inserted from a direction substantially orthogonal to the refill support shaft. Rotating payout type writing instrument characterized by being made.   The fitting recess has a width of an opening edge for inserting the refill support shaft set smaller than an outer diameter of the refill support shaft, and has a width on the back side of the opening edge. 2. The opening portion is set to be larger than the width of the portion, and the opening edge portion is elastically expanded so that the refill support shaft is inserted into the opening edge portion. The rotary feeding type writing instrument as described. The refill support shaft has a fitting shaft portion and a rib protruding from the outer wall surface of the fitting shaft portion,
The fitting recess is configured such that the fitting shaft portion inserted from the opening edge portion is fitted into the recess main body on the back side of the opening edge portion, and the rib is fitted to the opening edge portion. The rotary feeding type writing instrument according to claim 1 or 2.

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