JPH0595787U - Compound writing instrument - Google Patents

Abstract

(57) [Abstract] [Purpose] By rotating the cap with respect to the tip shaft, multiple cursive bodies can be selectively retracted from the tip, exposing the eraser when moving the cap forward and By rotating the cap, the eraser can 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 49 is rotatably attached to the cylindrical portion behind the cylindrical cam, and the eraser 69 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. The cap 37 is attached to the outer periphery of the rear shaft so that only the shaft can be moved, and the cap is rotated forward with the cap moved to cause the eraser to protrude. In addition, the cap is retracted as it is, the eraser is immersed, and the cap is rotated with respect to the tip shaft to select the cursive body from the tip shaft so as to protrude.

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. Also, when the lead is extended, the eraser must be retracted from the rear end in order to knock it with the fingers. Therefore, it is troublesome to frequently rotate when writing or erasing. Further, if the knocker ignores the storage of the eraser and knocks, the fingers may be soiled, and oil may be attached to the end surface of the eraser to deteriorate the erasability and stain the paper surface. The present invention aims 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 cap having an opening at the rear end was fitted on the outer circumference of the rear shaft so that only the shaft could move, and a locking device was provided between the rear shaft and the cap to prevent the shaft from moving. 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, and the cap is prevented from rotating to rotate the cap left or right with respect to the front shaft or the center shaft. The tip of the body should be selected to project and retract from the mouth of the tip shaft. Also, when the cap is positioned forward of the rear shaft and locked, the eraser is exposed from the opening, the cylindrical cam prevents rotation of the center shaft, and is rotatable with respect to the cap. By rotating the cap to the left and right, the eraser appears and disappears from the rear shaft. If at least one of the cursive pencils is the sharp pencil cursive body, the guide of the guide cam where the brim of the cylindrical cam is opposed with the tip of the mechanical pencil cursive body protruding from the tip end of the front shaft. The circumferential groove is wide, and the cylindrical cam is configured to move freely within the range where the center of the cam is extended with respect to the guide cylinder. This is to provide a gap for a certain knock stroke.

[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, and a locking device 44. The rear shaft 49, the clutch 57, the eraser holder 67, and the eraser 69 are the main constituent elements. First, the guide tube 1 is made of resin, and as shown in FIG. 1, has a guide groove 8 that is long in the axial direction and opens on the side surface from the substantially central portion to the rear end. It has an axially long guide groove 8 ″ that opens to the front end to a slightly forward position. The front half of the guide cylinder 1 is provided with a cylinder part 9 having a front end opened with a partition part 15 having holes 36, 36 'communicating with the guide grooves 8, 8'. A flange portion 29 is formed on the outer peripheral portion near the 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 tubular 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 is provided on the side surface of the rear end of the guide cylinder. (Same as the configuration of the tubular portion of the guide tube in Japanese Utility Model Laid-Open 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 key groove 32 is formed on the side surface behind the cam slant surface 13 so that the clutch 57, which will be described later, is prevented from rotating and is appropriately frictionally engaged to be slidable, and the inner surface of the cylindrical cam 3 has a fan shape. A brim 17 is provided. In addition, a long slit 34 is formed in the cylindrical portion extending long rearward.

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. Grooves 31 that fit the ribs 62 of the clutch 57 and prevent mutual rotation are provided at a plurality of positions, and ribs 76 are provided between the grooves with the inclined surface 35 at the rear end.

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 49 is made of resin, and locking grooves 52 and 53 are provided on the outer peripheral portion at two axial positions. A spiral groove 50 is formed on the inner surface. Furthermore, on the inner surface of the tip end, there is provided a projecting engagement portion 73 which is engaged with an 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 67 has a bottomed hole portion for fixing the rear end of the eraser 69 to the rear end, the outer peripheral portion of the tip end of which is fitted into the slit 34 of the cylindrical cam 3 and the rear shaft 49. A projection 68 that fits into the spiral groove 50 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.

At the rear end of the cap 37, a clip 42 is fixed to a base portion 41 provided on the outer peripheral portion near the opening 40. The cap 37 is fitted on the outer peripheral portion of the rear shaft 49 so as to be axially shiftable. The cap 37 faces the locking grooves 52 and 53 of the rear shaft 49 and has a protruding locking portion 45 at the front end on the base 41. A lock device 44 having a button 47 at its rear end is attached to an intermediate fastening portion 46 so as to be appropriately rotated via a pin or the like. Further, the lock device 44 is fitted in a window portion 71 provided in front of the base portion 41 of the cap 37, and the button 47 thereof appropriately protrudes from the window portion 43 formed in the upper surface of the clip 42, A spring 48 is urged between the seat portion 74 in the base portion 41 and the lower portion of the button 47, and by pressing the button 47, the locking portion 45 moves up and down. Further, as shown in FIG. 8, a rib 38 having an inclined surface 65 at the rear end is formed at a plurality of positions in the front hole portion of the cap 37, and a groove 66 is provided between the rib and the rib. Has been. 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 57 has a flange portion 58 at the rear end, and a rib 59 having an inclined surface 61 at the front end is formed at a plurality of positions on the outer periphery of the front side. A groove 60 is provided between the groove and the groove, and a rib 62 having an inclined surface 63 is also provided at a plurality of positions at the tip. Further, the shaft center has a hole provided with a key 64.

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 '(not shown), the cam slopes of the projections 19, 19' are always set to the cam slope 13 of the cylindrical cam 3. Keeps in contact with.

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 cylindrical portion of the cylindrical cam 3 that projects long from the rear end of the center shaft 4, the clutch 57 is fitted in the key groove 32 so that the rib 62 corresponds to the groove 31 at the rear end of the center shaft 4. As for the clutch 57, the key 64 is fitted in the key groove 32 to prevent the mutual rotation, and the frictional engagement is appropriately performed between the clutches 57 so that the clutch 57 slides in the axial direction. It should be noted that the positions of the guide cylinder 1 and the groove 31 of the center shaft in the circumferential direction, the positions of the cam slope 13 of the cylindrical cam and the ribs 62 of the clutch in the circumferential direction, the flange 17 of the cylindrical cam and the peripheral groove 16 of the guide cylinder. The positional relationship in the circumferential direction of the clutch is set so that the cylindrical cam 3 rotates and the rib 62 of the clutch engages with the groove 31 of the center shaft in each of the protruding position and the retracted position of the cursive body. ing.

Further, an eraser holder 67 is elastically fitted to the cylindrical portion of the cylindrical cam 3, and the projection 68 of the eraser holder 67 is fitted into the slit 34 provided in the cylindrical portion of the cylindrical cam 3. The eraser holder 67 is slidably attached to the cylindrical portion of the cylindrical cam 3 so as not to rotate. Further, the rear shaft 49 is elastically fitted by being fitted into the cylindrical portion of the cylindrical cam 3, and the rear shaft 49 is rotatably fixed to the cylindrical portion so as not to come off and the projection 68 of the eraser holder 67 is attached to the rear shaft 49. It is fitted in the spiral groove 50 of. Further, the tip of the rear shaft 49 is substantially in contact with the flange portion 58 of the clutch 57. Further, the ring 51 having an opening at the rear end is substantially fixed to the rear end of the rear shaft 49 and is fixed to the rear end of the cylindrical portion of the cylindrical cam 3, and the eraser 69 is inserted from the opening of the ring 51. Then, the rear end of the eraser 69 is fixed to the eraser holder 67. As described above, when the rear shaft 49 is rotated with respect to the cylindrical cam 3, the eraser 69 appears and disappears from the opening.

The cap 37 is inserted by inserting the rear shaft 49 from the front end of the center shaft 4, the rib 38 on the inner surface of the cap is fitted in the groove 60 of the clutch 57, and the cap 37 and the clutch 57 rotate. It can be stopped and the axis can be moved freely.

By the way, the cylindrical body 54 has a slit 75 and a projecting locking portion 70 in line on the outer peripheral side from the front, and a key (not shown) is provided on the inner surface on the opposite side. There is. The tubular body 54 is inserted between the outer periphery of the rear shaft 49 and the inner periphery of the cap 37 with the cap 37 attached, and the cut window 75 faces the window portion 71 of the cap and the locking portion 70. Fits into the window portion 71 and is locked to the rear end face thereof. The key is fitted in a groove 72 provided on the outer periphery of the rear shaft 49 so as to be axially movable, and as a result, the cap 37 and the rear shaft 49 are configured to be rotatable and to be axially movable via the cylindrical body 54. Further, the tip end contact portion 56 of the cylindrical body 54 faces the rear end of the flange portion 58 of the clutch 57. In this state, the locking device 44, the clip 42, etc. 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, the rib 38 of the cap is fitted in the groove 60 of the clutch, so that 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 49, the eraser 69 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 45 of the lock device 44 is engaged with the locking groove 52 of the rear shaft 49, the cap 37 and the cylindrical cam 3 are integrated in the axial direction. From this state, the crown portion 55 at the rear end of the cap is knocked, and the cylindrical cam 3 is 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 62 of the clutch 57. When the transition is made, the operation is transmitted to the sliding piece 5, the core pipe 20, and the mechanical pencil writing body 6, and from the state where the step portion 25 at the tip of the writing abuts the inner step portion 24 of the tip shaft 2, together with the joint 30, The chuck moves axially and the lead is extended. 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 retracts, and instead, the writing tip portion of the writing body 7 such as a ballpoint pen projects from the leading tip end opening.

Next, when the button 47 is pressed to release the engagement between the locking portion 45 of the lock device and the locking groove 52 of the rear shaft and the cap 37 is moved forward, the eraser 69 is opened. Exposed from the part 40. Further, the locking portion 45 of the locking device is engaged with the locking groove 53 of the rear shaft, and the cap 37 is fixed to the rear shaft 49. Further, the contact portion 56 of the tubular body 54 contacts the flange portion 58 of the clutch 57, and the clutch 57 is further advanced to fit the rib 62 into the groove 31 of the center shaft 4. Further, the rib 38 of the cap is disengaged from the groove 60 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 68 of the eraser holder 67 is rotated with the rotation. However, since the eraser holder 67 moves backward along the spiral groove 50 of the rear shaft 49, the eraser 69 is fed out from the opening 40. Further, when the cap 37 is rotated to the other side, the eraser holder 67 advances, and the eraser gum 69 is retracted from the opening 40 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. Since the cap can be stored by moving it backward with respect to the center shaft, it is extremely easy to use without the hassle of rotating one by one as in the conventional case. Although the eraser is mounted in the embodiment of the present invention, it is also possible to mount a solid correction agent used for correcting writing with a ballpoint pen.

[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 where 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 Lock Device 45 Locking part 46 Fixing part 47 Button 48 Spring 49 Rear shaft 50 Spiral groove 51 Ring 52 Locking groove 53 Locking groove 54 Cylindrical body 55 Crown part 56 Abutment part 57 Clutch 58 Flange part 59 Rib 60 Groove 61 Sloping surface 62 Rib 63 Sloping surface 64 Key 65 Sloping surface 66 Groove 67 Eraser holder 68 Protrusion 69 Eraser 70 Locking part 71 Window part 72 Groove 73 Engaging part 74 Seat part 75 Cut window 76 Rib

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. Further, a cap having an opening at the rear end 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, and the lock device is released. When the cap is moved forward in this state, the cylindrical cam prevents rotation of the center shaft when the eraser is exposed from the opening, and the cylinder cam is free to rotate and the cap is locked to the rear shaft. By rotating the cap to the left or right with respect to the shaft or center shaft, the eraser can be retracted and retracted, and when the cap moves backward and is locked to the rear shaft, the cylindrical cam can rotate with respect to the center shaft and prevents rotation with respect to the cap. By rotating the cap to the left or right with respect to the front shaft or the center shaft, each sliding piece is brought into contact with the cam slope of the cylindrical cam. Multiplex writing implement is moved alternately, characterized in that the tip of the writing body has form freely selectively retractable from front barrel tip opening to. 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.