JPH0528689U - Compound writing instrument - Google Patents

Abstract

(57) [Abstract] [Purpose] By rotating the cap with respect to the tip shaft, multiple cursives can be selectively retracted from the tip of the shaft, and the cap is moved forward to expand the lid and eraser. While exposing the, the cap can be rotated with respect to the tip shaft to allow the eraser to appear and disappear. [Structure] The front shaft 2 is fixed to the front half of the guide cylinder 1, and the center shaft 4 is fixed to the rear half of the guide cylinder 1. Also, a plurality of writing bodies are fitted in the guide groove of the guide cylinder 1 so as to be movable back and forth,
The cylindrical cam 3 is rotatably fixed to the rear end of the guide cylinder 1.
The rear shaft 52 is rotatably attached to the cylindrical portion behind the cylindrical cam, and the eraser 73 is fitted to the cylindrical portion so that the eraser can be axially moved by the rotation of the rear shaft with respect to the cylindrical portion. A cap 37 having a cover 44 for constant shielding is attached to the outer periphery of the rear shaft so that only the shaft can move. The cap is moved forward, the cover is opened, and the cap is rotated with respect to the front shaft. Put the eraser in and out. Further, the eraser is shielded in the state where the cap is retracted, and the cap is rotated with respect to the tip shaft to selectively project the tip of the writing body from the tip end opening of the tip.

Description

[Detailed description of the device]

[0001]

[Industrial use field]

 The present invention relates to a compound writing instrument in which the tips of a plurality of writing materials can be alternately retracted and retracted at the tip of the front shaft, and an eraser can be retracted and retracted from the rear end of the cap.

[0002]

[Prior Art]

 Conventionally, as an example of a compound writing instrument, as shown in Japanese Utility Model Publication No. 64-3491 published by the same applicant, it has a sliding groove for guiding two writing instruments and is fixed to a leading shaft. It has a guide barrel and a cam slope that contacts the sliding commas attached to the two cursive bodies fitted to the guide barrel at the front end, and the rear end serves as a knocking portion in the axial direction with respect to the cap. Equipped with a cylindrical cam mounted so that it can move freely and can rotate in the circumferential direction as a unit. By rotating the cap with respect to the tip shaft, two writing instruments can be selectively retracted at the tip end of the tip shaft. There are multiple writing instruments. Further, as a cited example of the present application, as seen in Japanese Utility Model Laid-Open No. 60-120889 by the same applicant, a compound type in which a crown protruding from the rear end of the cap is rotated so that an eraser appears and disappears. Writing instruments exist.

[0003]

[Problems to be solved by the device]

 In the above cited example, since the crown protruding from the rear end of the cap is short, it is difficult to pinch it with a finger, and the operation of retracting the eraser is difficult. In addition, when using a writing instrument, it is necessary to immerse the eraser from the rear end in order to stain the finger and the eraser with a knock etc. Further, since the eraser is exposed, there is a problem of dust adhesion and deterioration of the eraser. Further, there is a bad appearance due to the exposed eraser. The present invention is to solve the above problems.

[0004]

[Means for Solving the Problems]

 The compound writing instrument of the present invention devised to solve the above-mentioned problem is provided with engaging portions for fitting the tip of the tip shaft and the tip of the guide tube in a non-rotatable and retaining state, respectively, and fixing the both. .. A plurality of cursive bodies with sliding tops fixed to the rear end are fitted in a plurality of guide grooves provided in the guide cylinder so that they can be moved back and forth respectively via return springs, and a cam slope that is displaced in the axial direction is set at the front end. In addition to being provided in a circular shape, a flange is projected on the inner surface, and the flange is fitted in the peripheral groove provided on the outer periphery of the rear end of the guide cylinder, and the cylindrical cam is rotatably and securely attached to the guide cylinder. .. The center shaft was attached to the rear of the guide cylinder so as to cover the guide cylinder and the cylindrical cam, and the guide cylinder was prevented from rotating with respect to the center shaft, and the cylindrical cam was configured to be selectively non-rotatable with respect to the center shaft. .. A long cylinder is provided behind the cylindrical cam, the cylinder protrudes from the rear end of the center shaft, and a slit is provided on the cylinder. The rear shaft, which is inserted into the cylinder while it is inserted and has a spiral groove in the inner diameter, is rotatably attached to the cylinder of the cylindrical cam so that it does not come off, and the protrusion of the eraser holder is attached to the spiral groove. It was inserted. A lid that constantly shields the opening is rotatably provided at the rear end of the cap, and the cap is fitted on the outer periphery of the rear shaft so that only the shaft can move, preventing axial movement between the rear shaft and the cap. A locking device has been installed. When the cap is positioned rearward with respect to the rear shaft and locked, the cylindrical cam is freely rotatable with respect to the center shaft, the cap is prevented from rotating, and the cap is rotated left and right with respect to the front shaft or the center shaft. The tip of the shaft is selectively projected and retracted from the mouth of the tip shaft. Also, when the cap is positioned forward with respect to the rear shaft and locked, the lid expands and the eraser is exposed from the opening. At this time, the cylindrical cam prevents rotation of the center shaft and The eraser can be freely rotated, and the eraser can be projected and retracted from the rear shaft by rotating the cap left and right with respect to the front shaft or the center shaft. If at least one of the cursive pencils is a mechanical pencil cursive body, the brim of the cylindrical cam faces with the tip of the mechanical pencil cursive body protruding from the tip of the tip shaft. The guide groove has a wide circumferential groove to allow the shaft to move freely within the range where the cylindrical cam extends the core relative to the guide cylinder.In addition, between the rear end of the center shaft and the front end of the rear shaft, there is a core. That is, the knock stroke required for feeding is provided.

[0005]

【Example】

 Embodiments will be described below with reference to the drawings. The compound writing instrument of the present invention includes a guide cylinder 1, a tip shaft 2, a cylindrical cam 3, a center shaft 4, a pair of sliding pieces 5, 5 ', a mechanical pencil writing body 6, a writing body 7 such as a ballpoint pen, a cap 37, a lid portion 44. The lock device 47, the rear shaft 52, the clutch 61, the eraser hodder 71, and the eraser 73 are main components. First, as shown in FIG. 1, the guide tube 1 is made of resin and has an axially long guide groove 8 that is open to the side surface from the substantially central portion to the rear end, and the opposite side surface from the central portion to the rear. It has an axially long guide groove 8'opened to a position slightly forward of the end. The front half of the guide cylinder 1 is provided with a cylinder part 9 having a partition part 15 communicating with the guide grooves 8 and 8 ′ and having holes 36 and 36 ′ and having a front end opened. A flange portion 29 is formed on the outer peripheral portion near the rear end, and a bulging engagement portion 12 is formed on the outer peripheral portion in front of the flange portion 29. Further, on a side surface slightly rearward of the rear end of the cylindrical portion 9, there is formed an engaging portion 28 which bulges in a circumferential shape and fits into an engaging groove 27 of an inner shaft 4 which will be described later. A circumferential groove 16 in the circumferential direction is provided on the side surface of the rear end of the guide cylinder. (Same as the structure of the guide tube of Japanese Utility Model Publication No. 64-3491)

The front end of the front shaft 2 is tapered, and the front end of the inner hole is provided with an inner step portion 24. In addition, the rear end hole is provided with an engagement groove 11 that is engaged with an engagement portion 12 provided on the outer peripheral portion of the tubular portion 9 of the guide tube to prevent the guide tube 1 from coming off and rotation. There is. The tubular portion 9 and the tip shaft 2 are detachably fixed with an appropriate force. (Same as the structure of the front shaft in Japanese Utility Model Publication No. 6-43491)

The cylindrical cam 3 is made of resin and has a cylindrical shape. The front end edge of the cylindrical cam 3 has a cam slant surface 13 that is circumferentially displaced forward and backward, and a notch 14 is formed at the frontmost end of the cam slant surface 13. .. Further, a groove 31 is formed on the side surface behind the cam slant surface 13 so that a clutch 61, which will be described later, is prevented from rotating, and is appropriately frictionally engaged so as to be slidable. The inner surface of the cylindrical cam 3 has a fan shape. A bar 17 is provided. In addition, a long slit 34 is formed in the cylindrical portion extending long backward.

The center shaft 4 has an engaging groove 27 on the inner surface portion of the front end that prevents the rear portion of the guide cylinder 1 from rotating and from coming off, and on the rear end portion thereof, as will be described later, as shown in FIG. A plurality of grooves 31 each having a slanted surface 35 for fitting the ribs 66 of the clutch 61 to prevent mutual rotation are provided.

The sliding piece 5 has a protrusion 19 on the outer surface, and a central portion projects from the rear end face of the protrusion 19 and both sides of the protrusion 19 have a slope substantially equal to that of the cam slope 13 of the cylindrical cam 3 described above. have. Further, there is provided a hole that abuts on the flange portion 21 of the core pipe 20 and projects and fits behind the core pipe 20 for a long time. Similarly to the sliding piece 5, the sliding piece 5'has a projection 19 'and a cam slope, and an engaging portion 23 for fixing the rear end of the writing body 7 such as a ballpoint pen is provided at the tip. .. The locking portion may be formed in a pipe shape and the rear end of the writing body may be fitted therein.

The rear shaft 52 is made of resin, and locking grooves 55 and 56 are provided on the outer peripheral portion at two axial positions. A spiral groove 53 is formed on the inner surface. Furthermore, on the inner surface of the tip end, there is provided a projecting engagement portion 78 which is engaged with the engagement groove 33 provided in the cylindrical portion of the cylindrical cam 3 and is rotatable with respect to the cylindrical cam 3 and which prevents it from coming off. Has been formed.

The eraser holder 71 has a bottomed hole portion for fixing the rear end of the eraser 73 to the rear end, and the outer peripheral portion of the tip end is fitted into the slit 34 of the cylindrical cam 3 and the rear shaft 52 A protrusion 72 that fits into the spiral groove 53 is provided at an appropriate position.

The mechanical pencil writing body 6 incorporates a general chuck mechanism, is joined to the core pipe 20 via a joint 30 connected to the chuck mechanism at the rear end, and has a flange portion provided at the rear of the core pipe 20. The sliding piece 5 is fitted in contact with the sliding piece 21, and the rear end hole of the core pipe 20 protruding from the rear end of the sliding piece 5 is closed by a tail plug 22 or the like. The lead-out is performed by sliding the chuck by the axial transition of the sliding piece 5 with the tip step portion 25 of the mechanical pencil writing body 6 contacting the inner step portion 24 of the tip shaft 2.

The cap 37 covers the cap 37 by energizing a spring 46 between the cap 37 and the lid 44 on a base 41 provided on the outer periphery near the opening 40 at the rear end. The portion 41 is rotatably attached, and the lid portion 44 is configured to always shield the opening 40. A clip 42 is fixed to the base 41. The cap 37 is fitted onto the outer peripheral portion of the rear shaft 52 so as to be axially movable, but the cap 37 faces the locking grooves 55 and 56 of the rear shaft 52, and the base portion 41 has a protruding locking portion 48 at the front end. A lock device 47 having a button 50 at the rear end is attached to an intermediate fastening portion 49 so as to be appropriately rotated via a pin or the like. Further, the locking device 47 is fitted in a window portion 77 provided in front of the base portion 41 of the cap 37, and the button 50 thereof appropriately protrudes from the window portion 43 bored on the upper surface of the clip 42 so that the base portion 41 is secured. A spring 51 is urged between the seat portion 74 and the lower portion of the button 50, and when the button 50 is pressed, the locking portion 48 moves up and down. Further, as shown in FIG. 7, a rib 38 having an inclined surface 69 at the rear end is formed at a plurality of positions in the front hole portion of the cap 37, and a groove 70 is provided between the ribs. It has been done. A decorative ring 39 is fixed to the tip of the cap 37 with an appropriate gap with respect to the outer circumference of the center shaft 4.

As shown in FIG. 5, the clutch 61 has a flange portion 62 at the rear end, and a rib 63 having an inclined surface 65 at the tip is formed at a plurality of positions on the outer periphery of the front side. A groove 64 is provided between the groove and the groove, and a rib 66 having an inclined surface 67 is also provided at a plurality of points at the tip. Further, the shaft center has a hole provided with a key 68.

The mechanical pencil writing body 6 and the writing body 7 such as a ball-point pen are connected to the respective sliding pieces 5, 5 ″ at their rear ends so as to be freely movable in the respective guide grooves 8, 8 ″ of the guide cylinder 1. It is fitted and is urged rearward by the return springs 26, 26 'interposed between the front end faces of the sliding pieces 5, 5'and the guide grooves 8, 8'of the guide cylinder 1 and the partition 15 on the front face. It The cylindrical cam 3 is elastically fitted in the circumferential groove 16 of the guide cylinder 1 so as to be rotatable in the circumferential direction with respect to the guide cylinder 1 so as to be prevented from coming off and fixed. Normally, the circumferential groove 16 and the brim 17 are dimensioned so that the cylindrical cam 3 is prevented from rotating in a state in which each writing body projects from the tip end opening of the tip shaft. Further, in a state in which the mechanical pencil writing body is projected, the circumferential groove position facing the brim 17 is formed wider by the stroke required for feeding the lead. Further, since the sliding pieces 5, 5'are urged rearward by the return springs 26, 26 ', the cam slopes of the projections 19, 19' are always kept in contact with the cam slope 13 of the cylindrical cam 3. ing.

Next, an explanation will be given according to the order of assembling each part. First, the center cylinder 4 is attached by fitting the guide cylinder 1 and the cylindrical cam 3, the rear surface of the flange portion 29 of the guide cylinder 1 is in contact with the front surface of the center shaft 4, and the engaging portion 28 is engaged with the center shaft 4. The guide cylinder 1 is elastically fitted in the groove 27 so that the guide cylinder 1 is not rotatable with respect to the center shaft 4, and the cylindrical cam 3 is rotatable with respect to the center shaft 4 and is axially movable. Further, the front shaft 2 is fitted in the cylinder portion 9 of the guide cylinder 1, and the rear end surface of the front shaft 2 is in contact with the front surface of the flange portion 29. The guide shaft 1 and the guide cylinder 1 are elastically fitted in the engaging groove 11 of FIG. The front shaft 2 can be attached and detached with an appropriate force. In this state, when the center shaft 4 is rotated to one side with respect to the leading shaft 2, the sliding piece 5 advances and the notch 14 at the foremost end of the cam slope 13 of the cylindrical cam 3 slides on one mechanical pencil writing body 6. The writing tip is engaged with the projection 19 of the moving piece 5 so that the writing tip is projected from the tip end opening. When the center shaft 4 is rotated to the other side with respect to the leading shaft 2, the sliding piece 5 retracts, the writing tip of the sharp pencil writing body 6 is retracted from the leading end of the leading spindle, and the sliding piece 5'is moved forward. The writing tip of the writing body 7 such as the other ballpoint pen projects from the tip end opening of the tip shaft.

On the other hand, in the tubular portion of the cylindrical cam 3 that projects long from the rear end of the center shaft 4, the clutch 61 is fitted so as to correspond to the key groove 32 and the rib 66 to the groove 31 at the rear end of the center shaft 4. As for the clutch 61, the key 68 is fitted into the key groove 32 so that the mutual rotation is stopped, and the clutch 61 is appropriately frictionally engaged with each other, so that the clutch 61 slides in the axial direction. The positions of the guide cylinder 1 and the groove 31 of the center shaft in the circumferential direction, the cam slope 13 of the cylindrical cam and the ribs 66 of the clutch in the circumferential direction, the flange 17 of the cylindrical cam and the circumferential groove 16 of the guide cylinder. The positional relationship in the circumferential direction is set such that the rib 66 of the clutch engages with the groove 31 of the center shaft when the cylindrical cam 3 is rotated and the cursive body is in the protruding state and the retracted state. ing.

Further, an eraser holder 71 is elastically fitted to the cylindrical portion of the cylindrical cam 3, and the projection 72 of the eraser holder 71 is fitted into the slit 34 provided in the cylindrical portion of the cylindrical cam 3. The eraser holder 71 is slidably mounted on the cylindrical portion of the cylindrical cam 3 so as not to rotate. Further, the rear shaft 52 is elastically fitted by being fitted to the cylindrical portion of the cylindrical cam 3, and is rotatably attached to the cylindrical portion so as not to come off and the projection 72 of the eraser holder 71 is attached to the rear shaft 52. It is fitted into the spiral groove 53 of. Further, the front end of the rear shaft 52 is substantially in contact with the flange portion 62 of the clutch 61. Further, the crown 54 having an opening at the rear end is fixed to the rear end of the cylindrical portion of the cylindrical cam 3 with the rear shaft 52 being substantially in contact with the rear end of the rear shaft 52. Then, the rear end of the eraser 73 is fixed to the eraser holder 71. As described above, when the rear shaft 52 is rotated with respect to the cylindrical cam 3, the eraser 73 appears and disappears from the opening. The inner diameter of the opening of the crown 54 is slightly larger than the outer diameter of the eraser 73.

Further, the cap 37 is inserted by fitting the rear shaft 52 from the front side of the center shaft 4, the rib 38 on the inner surface of the cap is fitted in the groove 64 of the clutch 61, and the cap 37 and the clutch 61 rotate. It can be stopped and the axis can be moved freely. When the cap 37 is attached, the lid 44, the lock device 47, and the clip 42 are not attached to the cap.

By the way, the tubular body 57 has a slit window 76, a projecting locking portion 58 on the outer peripheral side from the front, and a projecting end portion 59 on the rear end, which are on the opposite side and on the inner surface. A key (not shown) is provided. The tubular body 57 is inserted between the outer periphery of the rear shaft 52 and the inner periphery of the cap 37 with the cap 37 mounted, the cut window 76 faces the window portion 77 of the cap, and the locking portion 58 is provided. Fits into the window 77 and engages with the front end of the seat 74 of the base 41, and the end 59 abuts the rear end of the seat 74. Further, the key is fitted in a groove 75 provided on the outer periphery of the rear shaft so as to be axially movable, and as a result, the cap 37 and the rear shaft 52 are configured to be rotatable via the cylindrical body 57 while being rotatable. Further, the front end of the cylindrical body 57 faces the rear end of the flange portion 62 of the clutch 61 as an abutting portion 60. In this state, the lid portion 44, the locking device 47, the clip 42 and the like are attached to the cap 37, and the multiple writing instrument of the present invention is completed.

[0021]

[Action]

 First, when the cap 37 is rotated to one side with respect to the front shaft 2 or the center shaft 4 from the state shown in FIG. 4, since the rib 38 of the cap is fitted in the groove 64 of the clutch, the cylindrical cam 3 rotates in conjunction with the rotation. To do. At that time, since there is no relative movement between the cylindrical cam 3 and the rear shaft 52, the eraser 73 is fixed. Accordingly, the notch 14 provided at the tip of the cam slope 13 of the cylindrical cam engages with the sliding piece 5 of the one mechanical pencil writing body 6 as the cylinder cam rotates, and the writing tip portion projects from the tip end opening. At this time, the flange 17 of the cylindrical cam 3 is located in the wide portion of the circumferential groove 16. Further, since the locking portion 48 of the locking device is engaged with the locking groove 55 of the rear shaft 52, the cap 37 and the cylindrical cam 3 are integrated in the axial direction. When the rear end of the lid portion 44 is knocked from this state, the cylindrical cam 3 is axially moved by the stroke of the gap formed between the tip of the groove 31 at the rear end of the center shaft 4 and the tip of the rib 66 of the clutch 61. The operation is transmitted to the sliding piece 5, the core pipe 20, and the mechanical pencil writing body 6, and the step 25 at the tip of the writing abuts the inner step 24 of the tip shaft 2 and the chuck together with the joint 30. The axis shifts and the core is paid out. Next, when the center shaft 4 is rotated to the other side with respect to the tip shaft 2, the mechanical pencil writing body 6 is retracted, and instead, the writing tip portion of the writing body 7 such as a ballpoint pen projects from the tip end tip opening.

Next, the button 50 is pressed to release the engagement between the locking portion 48 of the lock device and the locking groove 55 of the rear shaft, and the cap 37 is moved forward. The corner is abutted against the inner surface of the lid portion 44, and the lid portion is expanded to be exposed from the rear end of the opening portion 40. Further, the locking portion 48 of the locking device is engaged with the locking groove 56 of the rear shaft, and the cap 37 is fixed to the rear shaft 52. Further, the contact portion 60 of the cylindrical body 57 contacts the flange portion 62 of the clutch 61, and the clutch 61 is further advanced to fit the rib 66 into the groove 31 of the center shaft 4. Also, the rib 38 of the cap is disengaged from the groove 64 of the clutch. (See FIG. 2) When the cap 37 is rotated to one side with respect to the front shaft 2 or the center shaft 4 in this state, the cap and the cylindrical cam 3 are rotatable, and thus the protrusion 72 of the eraser holder 71 is rotated with the rotation. However, since it moves along the spiral groove 53 of the rear shaft 52, the eraser holder 71 is gradually retracted, and the eraser 73 is fed out from the opening of the crown 54. Further, when the cap 37 is rotated to the other side, the eraser holder 71 moves forward, and the eraser 73 is retracted from the opening of the crown 54 together with it. Further, at this time, the cylindrical cam 3 is stopped from rotating by the center shaft 4, and the writing body is fixedly movable.

[0023]

[Effect of the device]

 As described above, according to the present invention, the eraser can be projected and retracted by rotating the cap having an appropriate length with respect to the leading shaft or the center shaft, so that the eraser can be easily grasped by a finger, and even if the eraser is in an appropriate protruding state. , It can be stored by moving the cap rearward with respect to the center shaft, and it is extremely easy to use without soiling your fingers or eraser. In addition, since the eraser is shielded by the lid when not in use, dust does not adhere and the eraser does not deteriorate due to long-term exposure of the eraser unlike the conventional case. Also, since the eraser is shielded, it looks better when carried. Although the eraser is mounted in the embodiment of the present invention, when a solid correction agent used for correcting writing with a ballpoint pen is mounted, deterioration with time and adhesion of dust are more remarkable than the eraser. Therefore, the structure of the multiple writing instrument of the present invention exerts a single layer effect.

[Brief description of drawings]

FIG. 1 is a longitudinal cross-sectional view of an entire main part showing an embodiment of the present invention, showing a stored state of an eraser.

FIG. 2 is a longitudinal cross-sectional view of a main part in a state in which a lid part is opened, a cap is rotated, and an eraser is appropriately projected.

FIG. 3 is a front view in the state of FIG.

FIG. 4 is a top view showing an external appearance of a cursive body and an eraser in a portable state.

FIG. 5 is a front view of a clutch used in an embodiment of the present invention.

FIG. 6 is a side view of the clutch.

FIG. 7 is an external view showing a main part of a rear end of a center shaft used in an embodiment of the present invention.

FIG. 8 is a sectional view of an essential part of the tip of the cap used in the embodiment of the present invention.

[Explanation of symbols]

 1 Guide cylinder 2 Tip shaft 3 Cylindrical cam 4 Medium shaft 5 Sliding piece 5'Sliding piece 6 Mechanical pencil writing body 7 Writing material such as ballpoint pen 8 Guide groove 8'Guide groove 9 Cylindrical part 10 Knock spring 11 Engagement groove 12 Engagement Part 13 Cam slope 14 Notch 15 Partition 16 Circumferential groove 17 Collar 18 Through hole 19 Projection 19 'Projection 20 Core pipe 21 Flange section 22 Tail plug 23 Locking section 24 Inner step 25 Step section 26 Return spring 26' Return spring 27 Engagement groove 28 Engagement portion 29 Flange portion 30 Joint 31 Groove 32 Key groove 33 Engagement groove 34 Slit 35 Sloping surface 36 Hole 36 "Hole 37 Cap 38 Rib 39 Decorative ring 40 Opening 41 Base 42 Clip 43 Window 44 44 Lid Part 45 Fixing part 46 Spring 47 Locking device 48 Locking part 49 Fixing part 50 Button 51 spring 52 rear shaft 53 spiral groove 54 crown crown 55 locking groove 56 locking groove 57 cylinder 58 locking part 59 end part 60 contact part 61 clutch 62 flange part 63 rib 64 groove 65 slanted surface 66 rib 67 slanted surface 68 key 69 inclined surface 70 groove 71 eraser holder 72 protrusion 73 eraser 74 seat portion 75 groove 76 slit window 77 window portion 78 engagement portion

Claims (2)

[Scope of utility model registration request] 1. A sliding piece is provided in a plurality of guide grooves provided in the guide cylinder, each of which is provided with an engaging portion that engages the leading shaft and the leading end of the guide cylinder in a non-rotatable and slip-off preventive state. A plurality of cursive bodies fixed at the rear end are biased by return springs between the guide cylinder and the sliding piece, and are respectively fitted so as to be movable back and forth in the axial direction, and the cam slopes that are displaced in the axial direction are attached. A cylindrical cam that is provided at the front end in a circular shape, has a collar protruding from the inner surface, and has a slit in the cylindrical portion that extends further rearward,
The collar of the cylindrical cam is fitted into the peripheral groove provided on the outer periphery of the rear end of the guide cylinder, and the cylindrical cam is fixed to the guide cylinder so as to rotate and not come off. Further, the cylindrical shaft is fitted to the rear of the guide cylinder and the cylindrical cam so that the center shaft is fixed to the guide cylinder in a non-rotatable and retaining state, and the cylindrical cam is selectively prevented from rotating with respect to the center shaft. Further, an eraser holder having an eraser attached to the rear is attached to the cylindrical portion behind the cylindrical cam protruding from the rear end of the center shaft by inserting a protrusion provided on the outer periphery thereof into the slit of the cylindrical portion, and the outer periphery of the cylindrical portion. A rear shaft provided with a spiral groove in its inner diameter is rotatably fixed to the retainer so that the protrusion of the eraser holder is fitted in the spiral groove. In addition, a cap having a rear end that constantly shields the opening is fitted on the outer periphery of the rear shaft so that only the shaft can move, and a lock device is provided between the rear shaft and the cap to prevent the shaft from moving. , When the cap is moved forward with the lock device released, the cylindrical cam prevents rotation with respect to the center shaft and is free to rotate with respect to the cap when the lid expands and the eraser is exposed from the opening Then, the cap is locked to the rear shaft, and the eraser can be retracted by rotating the cap to the left or right with respect to the front shaft or the center shaft, and the cap moves backward to close the lid. When the cap is locked to the rear shaft, the cylindrical cam is rotatable with respect to the center shaft and is prevented from rotating with respect to the cap. Contact the cam slope of the cam By the above, by rotating the cylindrical cam with respect to the guide cylinder, each sliding piece is alternately moved in the front-rear direction so that the tip of each cursive body can be selectively retracted and retracted from the tip end opening of the leading shaft. Writing instrument. 2. At least one of the plurality of cursive bodies is a mechanical pencil cursive body, and the tip of the mechanical pencil cursive body projects from the tip end opening of the tip shaft and the cap is locked in the retracted position. The circumferential groove position of the guide cylinder facing the flange of the cylindrical cam is formed wide, and the cylindrical cam is axially movable within the range where the lead of the mechanical pencil is extended with respect to the guide cylinder, and the rear end and rear end of the center shaft are formed. 2. The rear shaft and the cap are configured to be axially movable with respect to the center shaft by providing a gap for knocking stroke required for feeding the lead with the tip of the shaft. Compound writing instrument.