JP2007290220A - Rotative delivering type writing implement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable connection of a driving body to a rotary cam tube by sliding the body forward and backward so that a distance of a gap brought about between a rotary shaft tube for operating a rotative delivering mechanism and a non-rotary shaft tube be kept fixed, in a rotative delivering type writing implement having the rotative delivering mechanism which is constituted of an inner tube body having an engaging hole, a slider having a cam projection, the rotary cam tube having a cam surface and the driving body. <P>SOLUTION: A fitting protuberant part is formed in the end face of a head end part of the rotary cam tube. A metallic cap having a fitting hole which corresponds to the fitting protuberant part and a projecting part which is provided on the outer peripheral surface and so projects outward as to have elasticity in the direction of the radius of a shaft, is formed. The fitting protuberant part is fitted in the fitting hole and the cap is so mounted as not to move forward and backward in relation to the head end part of the rotary cam tube. By fitting the fitting protuberant part in the fitting hole, the rotary cam tube is made rotatable with the rotation of the cap. The driving body is connected to the cap, being mounted in a pressed-in state by the projecting part. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rotary payout-type writing instrument, and includes a rotary payout mechanism including an inner cylinder having a locking hole, a sliding body having a cam projection, a rotary cam cylinder having a cam surface, and a drive body. The present invention relates to a rotary feeding type writing instrument.

  Conventionally, a rotating cam cylinder having a cam surface is accommodated in an inner cylinder having a locking hole with a head end projecting from a rear end opening of the inner cylinder, and a sliding body having a cam projection is provided as the rotating cam. The cam projection is brought into contact with the cam surface of the cylinder, and the cam projection is latched and received in the latching hole of the inner cylinder, so that the drive body is protruded from the rear end opening of the inner cylinder. In the front shaft and the rear shaft that are connected to the end portion and have a rotation feeding mechanism configured to be connected to the rotary shaft cylinder so as to be rotatable in conjunction with the rotation of the rotary shaft cylinder. By rotating the rear shaft with respect to the front shaft as a rotating shaft cylinder, the driving body and the rotating cam cylinder rotate, and the cam action of the cam protrusion of the sliding body contacting the cam surface of the rotating cam cylinder and the cam surface The sliding body moves back and forth, and the refill contained in the shaft cylinder moves back and forth accordingly, and the writing tip moves to the tip of the front shaft. Rotating feeding type writing instrument comprising by retractable from mouth are known.

  As shown in FIG. 13, conventionally, in the rotary paying-out writing instrument 50 having such a structure, the rotary cam cylinder 51 has the head end 51 a of the rotary cam cylinder 51 rearward from the rear end opening 53 of the inner cylinder 52. It protrudes and is arranged. A driving body 54 is fixed to the head end portion 51a with a parallel pin 55. The rear end of the driving body 54 forms, for example, a male screw portion 56, and is a female screw of a crown 58 attached to the rear end of the rear shaft 57. The head crown 58 is connected to the rear shaft 57 in a press-contact state via a ring 60 or the like by being screwed to the portion 59, and the head crown 58 and the driving body 54 can be rotated in conjunction with the rear shaft 57. It is like that. The inner cylinder 52 has a front end connected to the front shaft 62 via a connection cylinder 61 and the like.

  By the way, in order to make the front shaft 62 and the rear shaft 57 relatively rotatable, a clearance is provided so that the rear end surface of the front shaft 62 and the front end surface of the rear shaft 57 do not interfere with rotation. However, due to the relationship with the dimensional tolerance of the total length of each member, when the members are assembled to complete the rotary payout type writing instrument, the distance of the gap varies. In order to conceal the variation in the gap distance, the gap portion is covered by attaching a decorative ring 63 to the tip portion of the rear shaft 57 so that the gap cannot be seen from the outside. Naturally, the process cost and member cost of mounting the decorative ring 63 are required, and the manufacturing cost of such a rotary pay-out writing instrument becomes high.

  Therefore, the present inventors believe that if the gap distance does not vary and can be assembled at a constant distance, it is not necessary to attach the decorative ring, and what should be done to make the gap distance constant? Various studies were conducted. As a result, in order to achieve the above-mentioned problem without a complicated structure and without significantly changing the conventional manufacturing process, the rotating cam cylinder is not coupled with the driving body via a pin. If the head end portion of the rotating cam cylinder can be connected to the driving body by a method such as press-fitting, the gap distance can be made constant by adjusting the insertion distance of the head end portion of the rotating cam cylinder into the driving body. Knew.

However, the rotating cam cylinder is press-fitted into the drive body so that the rotary cam cylinder can be reliably rotated in conjunction with the rotation of the drive body, and the press-fitting distance can be adjusted so that it does not move more easily. It is difficult as a practical problem to manage the inner diameter of the cylinder head end and the driving body in consideration of the tolerance of each dimension. Further, even if a protrusion is formed on the outer peripheral surface of the head end portion of the rotating cam cylinder and the head end portion is press-fitted into the driving body, the rotating cam cylinder and the driving body are formed of synthetic resin, and the protrusion Wear due to frictional resistance or the like at the time of rotation, the rotation of the rotating cam cylinder is impaired.
JP 7-237394 A Japanese Patent Laying-Open No. 2005-205743

  An object of the present invention is to provide a rotary feeding type writing instrument having a rotary feeding mechanism constituted by an inner cylinder having a locking hole, a sliding body having a cam projection, a rotating cam cylinder having a cam surface, and a driving body. The driving body can be connected to the rotating cam cylinder at an arbitrary position so that the distance of the gap generated between the rotating shaft cylinder for operating the rotation feeding mechanism and the non-rotating shaft cylinder is kept constant. It is a thing.

The present invention
“1. A rotating cam cylinder having a cam surface is accommodated in an inner cylinder having a locking hole with a head end protruding from the rear end opening of the inner cylinder, and the sliding body having a cam projection is rotated. The cam projection is brought into contact with the cam surface of the cam cylinder, and the cam projection is engaged with the engagement hole of the inner cylinder body so that the drive body is protruded from the rear end opening of the inner cylinder body. An end surface of the head end portion of the rotary cam barrel in the rotary feeding type writing instrument having a rotary feeding mechanism connected to the head end portion and connected to the rotary shaft barrel so as to be rotatable in conjunction with the rotation of the rotary shaft barrel. A protrusion projecting outwardly so as to have a fitting hole in the head end face to which the fitting protrusion fits, and an outer peripheral surface having elasticity in the axial radial direction. Forming a metal cap having the cap, fitting the fitting projection into the fitting hole, and rotating cam It is mounted so as not to move back and forth with respect to the head end of the cap, and the rotating cam cylinder can be rotated as the cap rotates by fitting the fitting protrusion into the fitting hole, A rotary drawing-type writing instrument that is attached to a cap in a press-fitted state by a projection and connected.
2. As a means for mounting the cap on the head end of the rotating cam cylinder so as not to move back and forth with respect to the head end of the rotating cam cylinder, the cap is cut into a U-shape on the outer peripheral surface of the cap and the closed head end face side is the free end 2. The rotation according to claim 1, wherein the rotation is a means formed by providing a protruding piece bent inward and forming a locking groove corresponding to the protruding piece on the outer peripheral surface of the head end portion of the rotating cam cylinder. Feed-out type writing instrument.
3. At the position of the head end portion on the head end surface side on the line along the axis of the locking groove at the head end portion of the rotating cam cylinder, a free tip of a protruding piece that opens to the head end surface and does not connect to the locking groove is provided. Item 3. A rotary feeding type writing instrument according to Item 2, wherein a lockable guide groove is provided. "
It is what.

  In the present invention, by fitting the fitting protrusion of the rotating cam cylinder into the fitting hole of the cap, the rotating cam cylinder can be rotated as the cap rotates. The shape of the hole is not particularly limited. For example, the end surface shape viewed from the end surface side may be a quadrangle shape, a triangular shape, a polygonal shape, or the like, and the fitting hole may be a quadrilateral shape, a triangular shape, a polygonal shape, or the like corresponding to the shape. Alternatively, one or a plurality of fitting protrusions are provided at positions where the fitting protrusions deviate from the center position of the end surface of the head end portion of the rotary cam cylinder, and the fitting holes are provided to face the fitting protrusions. It may be. Alternatively, the shape of the end face viewed from the end face side of the fitting protrusion and the fitting hole may be a shape that has a side that is recessed toward the inside in the axial radial direction and intersects the rotation direction. good. Moreover, the shape of the fitting protrusion and the fitting hole may not be the same. For example, the fitting hole may have a triangular shape, and the fitting protrusion may be three circular fitting protrusions positioned at the triangular corners.

  The protrusion provided on the cap and projecting outward so as to have elasticity is formed by making two cuts parallel to the outer peripheral surface of the cap and pressing and expanding the portion from the inside to the outside of the cap. Alternatively, a member formed in a square shape may be fixed to the outer peripheral surface of the cap.

  As means for mounting the cap so as not to rotate and move back and forth with respect to the head end of the rotating cam cylinder, the cap is attached to the head end of the rotating cam cylinder with an adhesive, press-fitted, or the cap is attached to the rotating cam cylinder. There are a variety of methods such as caulking partially after mounting on the head end of the cylinder, or by fitting the concave and convex portions.

  Since the rotary drawing-type writing instrument of the present invention has the structure as described above, the drive body is positioned at the head end protruding from the opening at the rear end of the inner cylinder of the rotary cam cylinder, and the connection position is positioned in the direction along the axis. Since it can be connected in an adjustable manner, the distance between the rotating shaft cylinder and the non-rotating shaft cylinder for operating the rotary feeding mechanism can be made constant, and there is no variation in the distance between the gaps. It is not necessary to cover and hide the gap with a ring or the like, so that the manufacturing process can be simplified and the cost required for the members can be reduced.

  According to a second aspect of the present invention, the cap is cut into a U-shape on the outer peripheral surface of the cap to provide a protruding piece bent inward with the closed head end surface as a free end, and at the head end of the rotating cam barrel If a locking groove corresponding to the protruding piece is formed on the outer peripheral surface of the portion, and the protruding piece is locked and attached to the locking groove, the free end of the protruding piece is the outer periphery of the head end portion of the rotating cam cylinder. The cap is prevented from moving to the rear end side of the cap by being locked in the locking groove formed on the surface, so that the cap does not come out of the head end portion of the rotating cam cylinder. Further, the processing applied to the parts is relatively easy, and even when assembled, it is sufficient to insert the projecting piece so as to be locked in the locking groove, which is very simple.

  When the cap is attached to the head end of the rotating cam cylinder and the locking groove formed on the head end of the rotating cam cylinder is engaged with the protruding piece of the cap, the rotating cam as in the invention according to claim 3. By providing the guide groove as described above at the head end of the cylinder, the head end of the rotating cam cylinder is inserted into the cap, and the cap is rotated to temporarily lock the protruding piece into the guide groove. By pushing the cap, the protruding piece can be easily locked in the locking groove, and there is an advantage that the position of the cap in the rotation direction with respect to the head end portion of the rotating cam cylinder can be easily set.

Embodiments of the present invention will be described with reference to the drawings.
Although the rotation payout type writing instrument 1 of the present invention will be described as a rotation payout type ballpoint pen for convenience, it is not limited to this. In the shaft cylinder 2 formed by the front shaft 2a and the rear shaft 2b, the ball-point pen body 3 is urged toward the rear end side of the rear shaft 2b by a coil spring 4, and is connected to the rotary feeding mechanism and accommodated. is there.

  The rotary feeding mechanism has an inner cylindrical body 6 (see FIG. 2) having a locking hole 5 in the direction along the axis on the outer peripheral surface and opened at both ends (see FIG. 2), and the outer peripheral surface as shown in FIG. A sliding body 8 having a cam projection 7 to be locked in the locking hole 4, a rotating cam cylinder 10 having a cam surface 9 abutting on the rear end face of the cam protrusion 7, and a head end portion of the rotating cam cylinder 10 11 and a driving body 12 (see FIG. 1) coupled to the motor 11. Similar to the conventional rotary feed-out mechanism, the rotary cam cylinder 10 is accommodated in the inner cylinder 6 by projecting the head end 11 from the rear end opening 13, and the cam projection 7 is connected to the inner cylinder 6. The rear end surface of the cam projection 7 is held in contact with the cam surface 9 of the rotary cam barrel 10 and is received.

  A fitting projection 14 is provided on the head end surface 11 a of the head end 11 of the rotating cam cylinder 10. As for the shape of the fitting protrusion 14, the planar shape seen from the head end surface 11a side is a substantially Y-shaped columnar shape as shown in FIG. FIGS. 7 to 10 show other embodiments of the fitting protrusion 14, and FIG. 7 shows that the planar shape seen from the side of the head end face 11a is circular and is shifted by 120 degrees in the circumferential direction at a position equidistant from the center point. There are three columnar-shaped fitting protrusions 14b at the same position. FIG. 8 shows a fitting protrusion 14c having a quadrangular prism shape in plan view when viewed from the head end surface 11a side. FIG. 9 shows a fitting protrusion 14d having a rectangular columnar shape when viewed from the head end surface 11a side. FIG. 10 shows still another embodiment of the fitting protrusion 14, which is a fitting protrusion 14e having a triangular prism shape in plan view when viewed from the head end surface 11a side.

  A metal cap 15 attached to the head end 11 of the rotating cam cylinder 10 protruding from the rear end opening 13 of the inner cylinder 6 is fitted to the closed head end face 16 as shown in FIGS. A fitting hole 17 corresponding to the protruding portion 14 is provided, and two parallel cuts are made on the outer peripheral surface, and the portion protrudes toward the outer side in the axial radial direction formed by pressing and expanding from the inner side to the outer side of the cap. The projecting portions 18 having elasticity and the projecting pieces 19 which are cut in a U shape and bent toward the inner side with the closed head end face 16 side as a free end 19a are circumferentially spaced at equal intervals of 60 degrees. Three are provided alternately.

  On the side surface of the head end portion 11 of the rotating cam cylinder 10, there are a locking groove 20 to which the free end 19 a of the projecting piece 19 is locked, and a head end portion on a line along the axis of the locking groove 20. 11 is provided with a guide groove 21 which is open to the head end face 11a and is not connected to the locking groove 20 and which can lock the free tip 9a of the projecting piece 19 formed on the cap 15.

  In order to cover and attach the metal cap 15 to the head end 11 of the rotating cam cylinder 10 protruding from the rear end opening 5 of the inner cylinder 6, the head end 11 is inserted into the cap 15, The projecting piece 19 is inserted until it touches the edge of the head end surface 11 a of the head end portion 11, whereupon the cap 15 is rotated with respect to the head end portion 12, and the projecting piece 19 is locked in the guide groove 21. Whether or not the projecting piece 19 is locked in the guide groove 21 can be known from the touch when the cap 15 rotates. If the rotation is stopped when the protruding piece 19 is locked to the guide groove 21 and the cap 15 is pushed into the head end portion 12 at that position, the protruding piece 19 can be locked to the locking groove 20 and attached. As shown in FIG. 5, a concave portion 22 is provided in the head end portion 11 of the rotary cam cylinder 10 facing the projection portion 18 of the cap 15 to weaken the air resistance when the projection portion 18 is deformed inward. ing.

  The drive body 12 is mounted in a press-fitted state by a protrusion 18 formed on the cap 15 on a metal cap 15 that is covered and mounted on the head end 11 of the rotating cam cylinder 10 protruding from the opening 5 of the inner cylinder 6. The driving body 12 is slidable in the direction along the axis. The rear end of the drive body 13 is screwed to the crown 23 provided at the rear end of the rear shaft 2b. The end surface of the rear shaft 2b is sandwiched between the driving body 12 and the crown 23, and when the rear shaft 2b is rotated, the driving body 12 can also be rotated together.

  A connecting cylinder 24 is screwed to the front shaft 2a, and a tip end portion of the inner cylinder body 6 is screwed to the connecting cylinder 24. Therefore, the inner cylinder 6 is interlocked with the rotation of the front shaft 2a.

  Similar to the conventional rotation feeding mechanism, the drive body 12 rotates in conjunction with the rotation of the rear shaft 4 by rotating the rear shaft 2b relative to the front shaft 2a. The rotating cam cylinder 10 is also rotated, and the ball pen body 3 is moved back and forth by the engaging action of the cam surface 9 of the rotating cam cylinder 10 and the cam projection of the sliding body 8, and the writing tip of the ball pen body 3 is moved to the front shaft 2a. It is made to appear and disappear from the front-end opening 25.

It is the figure which cut | disconnected the principal part which shows the side surface of the rotary paying-out type writing instrument which shows the Example of this invention, and is a figure which shows the state which the writing front-end | tip part of the ball-point pen body was immersed in the front-end | tip front-end opening part. It is a figure which shows a part of rotation feeding mechanism in the rotation drawing type writing instrument which shows the Example of this invention, and is an enlarged plan view of the inner cylinder which accommodated the sliding body and the rotation cam cylinder inside. It is an enlarged front view of the inner cylinder of FIG. It is sectional drawing of the II line | wire part of FIG. It is an enlarged side view of a sliding body and a rotating cam cylinder housed inside the inner cylinder. It is a front view of the rotating cam cylinder in FIG. It is a front view of the rotation cam cylinder which shows the other Example of the fitting protrusion part formed in the head end surface of the rotation cam cylinder. It is a front view of the rotation cam cylinder which shows the other Example of the fitting protrusion part formed in the head end surface of the rotation cam cylinder. It is a front view of the rotation cam cylinder which shows the other Example of the fitting protrusion part formed in the head end surface of the rotation cam cylinder. It is a front view of the rotation cam cylinder which shows the other Example of the fitting protrusion part formed in the head end surface of the rotation cam cylinder. FIG. 6 is an enlarged side view of a cap that is attached to the head end portion of the rotating cam cylinder. It is a front view of the cap in FIG. It is the figure which cut | disconnected the principal part which shows the side surface of the conventional rotary pay-out-type writing instrument, and is a figure which shows the state which the writing front-end | tip part of the ball-point pen body was immersed in the front-end | tip opening part of a front shaft.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotating feeding type writing instrument 2 Shaft cylinder 2a Front shaft 2b Rear shaft 5 Locking hole 6 Inner cylinder body 7 Cam protrusion 8 Slide body 9 Cam surface 10 Rotating cam cylinder 11 Head end part 12 Drive body 14 Fitting protrusion part 15 Cap 17 Fitting hole 18 Protruding part 19 Protruding piece 20 Locking groove

Claims (3)

  A rotating cam cylinder having a cam surface is accommodated in an inner cylinder having a locking hole with a head end projecting from a rear end opening of the inner cylinder, and a sliding body having a cam projection is mounted on the rotating cam cylinder. The cam projection is brought into contact with the cam surface, and the cam projection is received in the engagement hole of the inner cylinder body so that the drive body projects from the rear end opening of the inner cylinder body. And a rotary feeding type writing instrument having a rotary feeding mechanism configured to be connected to the rotary shaft cylinder so as to be rotatable in conjunction with the rotation of the rotary shaft cylinder, and fitted to the end surface of the head end portion of the rotary cam cylinder A metal having a protrusion, a fitting hole formed in the head end face to which the fitting protrusion is fitted, and a protrusion protruding outward on the outer peripheral surface so as to have elasticity in the axial radial direction. The cap is formed, the cap is fitted with the fitting protrusion in the fitting hole, and the head of the rotary cam cylinder is fitted. The rotation cam cylinder can be rotated with the rotation of the cap by fitting the fitting protrusion into the fitting hole so as not to move back and forth, and the drive body is A rotary drawing-type writing instrument that is attached to a cap and connected in a press-fitted state.   As a means for mounting the cap on the head end of the rotating cam cylinder so as not to move back and forth with respect to the head end of the rotating cam cylinder, the cap is cut into a U-shape on the outer peripheral surface of the cap and the closed head end face side is the free end 2. The means according to claim 1, wherein a projecting piece bent inward is provided, and a locking groove corresponding to the projecting piece is formed on the outer peripheral surface of the head end portion of the rotating cam cylinder. Rotating feeding type writing instrument. At the position of the head end portion on the head end surface side on the line along the axis of the locking groove at the head end portion of the rotating cam cylinder, there is a free tip of a protruding piece that opens to the head end surface and does not connect to the locking groove. The rotary drawing-type writing instrument according to claim 2, wherein a guide groove that can be locked is provided.

Images