JP2013018175A - Multiple writing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a problem that, in a multiple writing instrument that includes a mechanical pencil unit provided with a rotation drive mechanism of a writing lead as one writing instrument, a rotation movement of the writing lead is disturbed because the unit is made to be bent.SOLUTION: One of a plurality of writing instruments is a mechanical pencil unit 11, and the mechanical pencil unit includes a rotation drive mechanism 11d that drives to turn a rotor in a direction in response to the backward motion of a writing lead due to a writing pressure received by the writing lead in conjunction with the writing action or the forward motion of the writing lead due to the release of the writing pressure and that transmits the rotation movement of the rotor to the writing lead. The mechanical pencil unit 11 is disposed at the shaft center of a shaft tube 1 and a tip writing part 11a is configured to be let out from a tip opening 2a formed on the line passing through the shaft center of the shaft tube.

Description

  The present invention relates to a compound writing instrument in which a plurality of writing bodies are accommodated in a shaft cylinder, and the tip writing portion of any writing body can be fed out from the front end of the shaft cylinder, and in particular, a mechanical pencil is provided on one of the writing bodies. It relates to the compound writing instrument used.

There is provided a dual-type writing instrument having a structure in which a plurality of writing bodies are accommodated in a shaft cylinder and a tip writing portion of any one of the writing bodies is fed out from a front end of the shaft cylinder by a predetermined feeding operation.
In this compound writing instrument, a mechanical pencil writing body (hereinafter also referred to as a mechanical pencil unit) and a plurality of ballpoint pen writing bodies (hereinafter also referred to as ballpoint pen units) having different ink colors are accommodated in a shaft cylinder, There are many examples in which these are selectively used.

By the way, in the mechanical pencil unit used as one of the writing bodies, the writing core is unevenly worn as the writing progresses, so that a phenomenon occurs that the drawn line gradually becomes thicker at the beginning of writing. Further, not only the thickness of the drawn line changes, but also the contact area of the writing core with respect to the writing surface changes, so the phenomenon that the drawn line density changes as the writing progresses (the drawn line becomes lighter) also occurs.
Therefore, the present applicant has proposed a mechanical pencil in which the writing core rotates in accordance with the writing operation in order to solve the above-described problem, and this is disclosed in Patent Document 1.

  According to the mechanical pencil disclosed in Patent Document 1, the rotor receives a slight retraction operation of the writing core due to the writing pressure received by the writing core as a result of the writing operation, and a slight advance operation of the writing core due to the release of the writing pressure. A configuration is adopted in which a rotational drive mechanism is provided for rotationally driving the rotor in one direction, and the rotational motion of the rotor is transmitted to the writing core.

When a mechanical pencil having such a rotational drive mechanism is to be used as one unit in the above-mentioned double writing instrument, in a general dual writing instrument configuration, when the mechanical pencil unit is extended from the barrel. Then, the mechanical pencil unit is bent (bent) and fed out.
For this reason, in the mechanical pencil unit provided with the rotation drive mechanism of the writing core as described above, unnecessary stress in the direction perpendicular to the axis with respect to the rotation drive mechanism is received due to bending when being drawn out from the shaft cylinder. Is added, causing a problem that a problem occurs in the rotation operation of the writing core.

By the way, in patent document 2 and patent document 3, the position of the front-end | tip formed in the front-end | tip part of a shaft cylinder can be decentered from an axial center, and the front-end writing part can be drawn out without bending a mechanical pencil unit. A dual writing instrument configured as described above is disclosed.
Therefore, if the example of the dual writing instrument disclosed in Patent Document 2 and Patent Document 3 is adopted, the tip writing part can be fed out from the front end of the shaft cylinder without bending the unit, so that the rotation provided for the mechanical pencil unit Problems that cause problems with the drive mechanism can be solved.

International Publication WO2007 / 142135 Pamphlet International Publication WO2010 / 024346 Pamphlet Japanese Utility Model Publication No. 1-85092

  However, according to the dual writing instrument disclosed in Patent Literature 2 and Patent Literature 3, the tip writing portion fed out from the shaft cylinder is eccentric from the center of the shaft, so that the position of the tip writing portion fed out from the shaft barrel is It changes according to the grip position. For this reason, the writing feeling changes according to the grip position of the shaft tube, and a comfortable writing feeling cannot always be obtained.

  The present invention has been made on the basis of the technical background described above, and in particular, a mechanical pencil unit is selected for a double-type writing instrument having a mechanical pencil unit having a rotational drive mechanism of a writing core as at least one writing body. This eliminates the problem of obstructing the rotational movement of the writing core by bending the unit, and the position of the tip writing part of the mechanical pencil unit does not change according to the gripping position of the barrel, providing a comfortable writing feeling. It is an object of the present invention to provide a dual-type writing instrument capable of obtaining the above.

  The compound writing instrument according to the present invention, which has been made to solve the above-described problem, includes a plurality of writing bodies accommodated in a shaft cylinder, and any one writing body from a tip formed at the tip of the shaft cylinder. A writing instrument capable of feeding out the tip writing part of the at least one of the plurality of writing bodies, wherein at least one of the writing bodies is a mechanical pencil unit, and the mechanical pencil unit receives a writing core in accordance with a writing operation. A rotary drive mechanism is provided for rotating the rotor in one direction in response to the backward movement of the writing core by writing pressure and the forward movement of the writing core by releasing the writing pressure, and the rotational movement of the rotor is applied to the writing core. The mechanical pencil unit is arranged at the shaft center portion of the shaft tube, and the tip writing portion of the mechanical pencil unit is formed on the shaft tube. Characterized by being configured to be fed out from the previous port formed on a line passing through the center portion.

  In this case, in a preferred embodiment, the mechanical pencil unit is operated by pushing a knock bar disposed at the rear end portion of the shaft cylinder so that the tip writing portion is fed out from the front opening formed in the shaft cylinder. The tip writing part is configured to be accommodated in the shaft cylinder by operating a release button disposed on the outer peripheral part of the shaft cylinder.

According to the dual-type writing instrument having the above-described configuration, the mechanical pencil unit provided with the rotation drive mechanism is disposed at the shaft center portion of the shaft tube, and the tip writing portion is formed on a line passing through the shaft center portion of the shaft tube. Since it is configured to be fed out from the front end, it is possible to solve the problem that when the mechanical pencil unit is selected, the unit is deflected to prevent the writing core from rotating.
Moreover, the position of the front-end writing part in the mechanical pencil unit does not change according to the grip position of the shaft tube, and it is possible to provide a dual-type writing instrument that can always provide a comfortable writing feeling.

It is the perspective view which showed the external appearance structure about 1st Embodiment of the double-type writing instrument which concerns on this invention. It is the side view and longitudinal cross-sectional view which showed the external appearance structure about 1st Embodiment shown in FIG. It is the side view and longitudinal cross-sectional view which showed the external appearance structure of the state rotated 90 degree | times around the axis | shaft with respect to the state shown in FIG. It is the longitudinal cross-sectional view which each showed the drawing-out state of the mechanical pencil unit and the ball-point pen unit about 1st Embodiment. It is sectional drawing explaining the effect | action of the knock stick and lock member used in a mechanical pencil unit. It is the expansion perspective view which showed the single-piece | unit structure of the locking member. It is the side view and partial sectional view which showed the external appearance structure of the rotational drive mechanism mounted in the mechanical pencil unit. It is the perspective view which fractured | ruptured and showed a part of rotation drive mechanism similarly. It is the side view and longitudinal cross-sectional view which showed the external appearance structure about 2nd Embodiment of the double-type writing instrument which concerns on this invention. It is the side view and longitudinal cross-sectional view which showed the external appearance structure of the state rotated 90 degree | times around the axis | shaft with respect to the state shown in FIG.

The first embodiment of the dual-type writing instrument according to the present invention will be described first with reference to FIGS. 1 to 8, and the second embodiment will be described later with reference to FIGS. 9 and 10.
Each of the first and second embodiments exemplifies a single pencil unit having a writing core rotation drive device and a dual writing instrument in which two ballpoint pen units having different ink colors are accommodated in a shaft cylinder, respectively. doing.
And in each figure shown below, the same part is shown with the same code | symbol, However, in some drawings, the code | symbol is attached to the representative part for the sake of space, The detailed structure is each other drawing. In some cases, the reference numerals attached to are used for reference.

  As shown in FIG. 1, a cuticle 2 formed into a conical shape with, for example, a synthetic resin is screwed to the front end portion of the shaft tube 1 constituting the outer shape of the dual writing instrument. A tip 2a is opened at the tip of the cutlery 2 and the tip writing part of the mechanical pencil unit or the ball-point pen unit is selectively extended through the tip 2a.

FIG. 1 (A) shows an unused state in which no unit (cursive body) is drawn from the front opening 2a, and FIG. 1 (B) is arranged at the rear end of the shaft cylinder. By pushing the knock bar 19 in the axial direction, the tip writing part of the mechanical pencil unit is drawn out from the tip 2a.
FIG. 1C shows that the tip writing part (ballpoint pen tip) of one ballpoint pen unit is moved forward by sliding one slide knob 12c arranged on the peripheral side surface of the shaft cylinder forward in the axial direction. The state which was drawn out from the opening | mouth 2a is shown.

FIGS. 2 and 3 are a side view and a longitudinal sectional view, respectively, of the state where the dual writing instrument is rotated 90 degrees around the axis. In the shaft cylinder 1, as described above, the mechanical pencil unit 11, Two ballpoint pen units 12 and 13 having different ink colors are accommodated.
The mechanical pencil unit 11 and the two ballpoint pen units 12 and 13 having different ink colors are each moved in the axial direction into a through hole formed in a unit support member 15 attached to a substantially central portion in the shaft cylinder 1. It is installed as possible.

As shown in FIG. 2, the mechanical pencil unit 11 is disposed at the central portion of the shaft cylinder 1 whose outer periphery is formed in a substantially circular shape, and the writing core protrudes from the tip writing portion 11a. It is configured to be possible. Further, a well-known chuck mechanism 11b for holding the writing core is mounted slightly behind the tip writing portion 11a.
A rotary drive mechanism 11d is attached to the rear end of the mechanical pencil unit 11 via a relay pipe 11c that also serves as a lead case. The rotary drive mechanism 11d is a guide cylinder attached to the rear half of the shaft cylinder 1. 16 is accommodated so as to be slidable. The configuration and operation of the rotation drive mechanism 11d will be described later.

Between the unit support member 15 and the rotation drive mechanism 11d, a coiled return spring 17 is disposed so as to equip the relay pipe 11c. By the action of the return spring 17, the mechanical pencil unit is arranged. 11 is urged in a direction in which the shaft cylinder 1 moves backward.
Further, a knock bar 19 is accommodated in the rear of the rotation drive mechanism 11d so as to be slidable in the guide tube 16, and an internal space 19a formed in the knock bar 19 has a spring function. The lock member 20 having the above is accommodated.

  Although the configuration and operation of the lock member 20 will be described later, the lock member 20 keeps the knock bar 19 pushed in the axial direction and operates a release button 20a formed integrally with the lock member 20. By doing so, the holding state is released.

As shown in FIG. 3, the mechanical pencil unit 11 disposed in the central portion of the shaft cylinder 1 is symmetric with respect to the right and left sides of the mechanical pencil unit 11. Ballpoint pen units 12 and 13 are arranged.
As is well known, the ball-point pen units 12 and 13 use ball-point pen tips as the tip writing portions 12a and 13a, respectively, and are attached to the tip portions of the ink storage cylinders 12b and 13b.

Slide knobs 12c and 13c are respectively attached to the rear ends of the ink storage cylinders 12b and 13b. The slide knobs 12c and 13c are slits formed in the axial direction on the peripheral side surface of the shaft cylinder 1. It arrange | positions so that a part may protrude outside the axial cylinder 1 through a hole.
The first and second ballpoint pen units 12 and 13 are mounted so as to be movable in the axial direction in the through holes formed in the unit support member 15 as described above. Coiled return springs 22 and 23 are arranged so as to equip the ink storage cylinders 12b and 13b between 15 and the slide knobs 12c and 13c.
The ballpoint pen units 12 and 13 are urged in the direction of retreating in the shaft tube 1 by the action of the return springs 22 and 23.

FIG. 4A shows a state in which the knock bar 19 is pushed in the axial direction, and the tip writing portion 11 a of the mechanical pencil unit 11 is drawn out from the front end 2.
In this state, when the knock bar 19 is knocked in the axial direction, the knock operation is transmitted to the chuck mechanism 11b via the rotation drive mechanism 11d and the relay pipe 11c.
The chuck mechanism 11b is not particularly labeled, but a chuck body having a tip portion divided into, for example, three parts and having a through hole for a writing core, and an annular fastener disposed so as to surround the periphery of the chuck body A rubber holding chuck or the like that is disposed in front of the chuck body and temporarily holds the writing core is provided.

With the above-described configuration, upon receipt of the knocking operation of the knock bar 19, the chuck body constituting the chuck mechanism 11b moves back and forth, whereby the chuck body is repeatedly released and gripped by the writing core, and is held by rubber. The temporary holding action of the writing core by the chuck is added, and the writing core acts so as to be sequentially advanced forward.
Further, as is well known, the writing core can be returned into the tip writing portion 11a by pressing the writing core with a fingertip or the like while the knock bar 19 is knocked.
Thus, the compound writing instrument shown in the drawing can perform a writing operation using the mechanical pencil unit.

Next, FIG. 4B shows a state in which the first ballpoint pen unit 12 is used.
To switch from the state shown in FIG. 4A to the state using the first ballpoint pen unit 12 shown in FIG. 4B, the release button 20a formed on the lock member 20 is operated. Then, an operation of returning the mechanical pencil unit 11 into the shaft cylinder 1 by the action of the return spring 17 is executed.
When the slide knob 12c is slid forward in this state, the tip writing portion 12a of the first ballpoint pen unit 12 is drawn out from the tip 2 and writing operation by the ballpoint pen unit can be performed.

  Although not shown in the drawing, in a state where the first ballpoint pen unit 12 is used, a part of the slide knob 12c is engaged with a part of the guide tube 16, and the tip of the ballpoint pen unit 12 is written. The part 12a is made to maintain the state where it is drawn out from the tip 2.

Further, in the state shown in FIG. 4B, when switching to the second ball-point pen unit 13 to be used, the first operation is performed in the initial state where the slide knob 13c is slid forward in the axial direction. The slide knob 12 c of the ballpoint pen unit 12 is disengaged from the guide cylinder 16, and the first ballpoint pen unit 12 is retracted into the shaft cylinder 1 by the action of the return spring 22.
Subsequently, the second ball-point pen unit 13 can be used in the same manner as the example shown in FIG. 4B by sliding the slide knob 13c forward in the axial direction of the second ball-point pen unit 13.

5 and 6 show a relationship between the knock bar 19 used when the mechanical pencil unit 11 is used and the lock member 20 having a spring function.
As described above, the lock member 20 is accommodated in the internal space 19a formed in the knock bar 19 so as to hold the pushed state of the knock bar 19 and to release the pushed state of the knock bar 19 by operating the release button 20a. To be made. This is used for selecting whether to use the mechanical pencil unit 11 or not.

In FIG. 6, the single-piece | unit structure of the locking member 20 is expanded and shown. The lock member 20 is integrally formed of, for example, a synthetic resin. The lock member 20 is formed in a U shape by a bent portion 20b at the center, and extends in the same direction via the bent portion 20b. And a second leg 20d.
And the release button 20a mentioned above protrudes and forms in the position close | similar to the bending part 20b in the 1st leg part 20c.
Further, the tip end portion of the first leg portion 20c constitutes a locking end portion 20e, and the tip end portion of the second leg portion 20d is formed with an arcuate convex portion 20f in the lateral direction.

A basic configuration of the knock bar 19 to which the lock member 20 having the above-described configuration is mounted is shown in FIG. 5, and a release button 20 a formed on the lock member 20 passes through a through hole formed on the shaft tube 1. Projecting to the outside of the shaft cylinder 1.
Accordingly, FIG. 5 shows a state where the knock bar 19 is pushed in and a state where it is released with the release button 20a positioned on the line L.

As shown in FIG. 5, the knock bar 19 is formed with an inclined surface 19b that rises toward the internal space 19a formed therein, and the engaging portion 19c is orthogonal to the axis following the inclined surface 19b. It is formed in the direction.
Therefore, in the state shown in the upper half of FIG. 5, the first leg portion 20c of the lock member 20 is pushed along the inclined surface 19b of the knock bar 19 by pushing the knock bar 19 toward the left in the figure. climb. At this time, the arcuate convex portion 20 f formed on the second leg portion 20 d of the lock member 20 slides along the inner peripheral surface of the guide tube 16.

  Then, when the end of the pushing stroke of the knock bar 19 is reached, as shown in the lower half of FIG. 5, the locking end 20e of the lock member 20 enters the engaging part 19c on the knock bar 19 side, As a result, the knock bar 19 is held (locked) in the pushed state. As a result, the mechanical pencil unit 11 can be used as shown in FIG.

In the state shown in FIG. 4, the first leg portion 20c shown in FIG. 6 is deformed inward by pushing the release button 20a integrated with the lock member 20 in the axial center direction, and the engaging portion 19c on the knock bar 19 side. The locking end portion 20e engaged with is released from the locking.
Accordingly, as shown in FIG. 2, the mechanical pencil unit 11 is retracted in the shaft cylinder 1 by the action of the return spring 17, and the pushing state of the knock bar 19 is released.

Next, FIG. 7 and FIG. 8 show the configuration of the rotation drive mechanism 11 d provided in the mechanical pencil unit 11.
This rotational drive mechanism 11d is configured as one unit in a cylindrically formed cylinder member 22, and as shown in FIG. 7A, a connecting shaft 23c is connected to one end of the cylinder member 22 in the axial direction. Is protruding. As shown in FIG. 4 (A), the relay pipe 11c is fitted and connected to the connecting shaft 23c, thereby constituting the mechanical pencil unit 11 having the rotation drive mechanism 11d.

  A rotor 23 is provided in the rotation drive mechanism 11d, and a slight retreat operation in the axial direction by the writing pressure received by the writing core held by the chuck mechanism 11b and a slight advance in the axial direction by releasing the writing pressure. In response to an operation (hereinafter also referred to as a cushion operation), the rotor 23 is driven to rotate in one direction.

The rotor 23 is formed in a columnar shape, and a first cam surface 23a is formed on one end surface in the axial direction, and a second cam surface 23b is formed on the other end surface.
The first fixed cam surface 24 is disposed so as to face the first cam surface 23a of the rotor 23, and the second fixed cam surface is opposed to the second cam surface 23b. 25 is arranged.

The first cam surface 23a and the second cam surface 23b formed on the rotor 23 are formed with cams that are continuously serrated along the circumferential direction, and the first fixed cam surface. 24 and the second fixed cam surface 25 are also formed with cams that are continuously serrated along the circumferential direction.
The first cam surface 23 a, the second cam surface 23 b, the first fixed cam surface 24, and the second fixed cam surface 25 formed on the rotor 23 have saw-tooth cams whose pitches are substantially equal to each other. It is comprised so that it may become the same.

On the other hand, a torque canceller 26 that is formed in a cylindrical shape and is movable in the axial direction is disposed behind the rotor 23, and an inner peripheral surface front end of the torque canceller 26 and a rear end portion inner surface of the cylinder member 22. A coiled cushion spring 27 is mounted between them.
The cushion spring 27 urges the torque canceller 26 to push forward, and is pushed by the torque canceller 26 that receives the urging force, so that the rotor 23 acts forward.

Here, in the state where the mechanical pencil unit 11 is used as shown in FIG. 4A, when a writing pressure is applied to the writing core protruding from the tip writing portion 11a, the chuck mechanism 11b, the relay pipe It acts so that the rotor 23 is pushed slightly through 11c. Along with this, the first cam surface 23 a formed on the rotor 23 is joined to the first fixed cam surface 24 so as to be engaged.
At this time, the rotor 23 receives a rotational drive corresponding to a half pitch of one tooth of a cam formed in a sawtooth shape, and this rotational action rotates the writing core via the relay pipe 11c and the chuck mechanism 11b.

  On the other hand, when the writing pressure with respect to the writing core is released, the rotor 23 advances slightly by the action of the cushion spring 27 described above, and the second cam surface 23b formed on the rotor 23 is accordingly moved. The second fixed cam surface 25 is joined and meshed. At this time, the rotor 23 receives a rotational drive corresponding to a half pitch of one tooth of a cam formed in a sawtooth shape, and this rotational action is transmitted to the writing core via the relay pipe 11c and the chuck mechanism 11b.

Due to the above-described action, the rotor 23 is rotated by sequentially receiving a rotational motion in one direction, and accordingly, the writing core similarly receives the rotational motion sequentially in one direction.
Therefore, when the mechanical pencil unit 11 is used in the compound writing instrument according to the present invention, the problem that the drawn line gradually becomes thicker as the writing progresses can be solved, and the darkness of the drawn line also changes as the writing progresses ( This also eliminates the problem that the strokes become dull.

  As shown in FIG. 4A, in the state where the mechanical pencil unit 11 is used, the mechanical pencil unit 11 is disposed at the center of the shaft 1 and the tip writing part 11a is It is comprised so that it may draw | feed out from the front port 2a formed on the line | wire which passes along the axial center part of the axial cylinder 1. FIG.

  Thereby, the mechanical pencil unit 11 is not bent, and the smooth rotation operation of the writing core in the mechanical pencil unit 11 including the rotation drive mechanism 11d can be ensured. In addition, since the mechanical pencil unit 11 is disposed at the shaft center portion of the shaft tube 1, the position of the tip writing portion does not change according to the grip position of the shaft tube, and a comfortable writing feeling is obtained. be able to.

FIG. 9 and FIG. 10 show a second embodiment of the dual writing instrument according to the present invention, and show a state in which the dual writing instrument is rotated 90 degrees around the axis in a side view and a longitudinal sectional view, respectively. It is a thing.
9 and 10, parts that perform the same functions as those in the first embodiment shown in FIGS. 1 to 8 already described are denoted by the same reference numerals. Therefore, descriptions of individual configurations and operations will be omitted as appropriate.

In the second embodiment, the shaft tube 1 is formed in a flat shape as compared with the first embodiment already described.
A mechanical pencil unit 11 having a rotational drive mechanism 11d is disposed at the axial center of the shaft tube 1. The mechanical color of the mechanical pencil unit 11 is symmetrical with respect to the right and left sides of the mechanical pencil unit 11. Different first and second ballpoint pen units 12 and 13 are arranged.

  In addition, tip ends 3a to 3c are formed at the tip of the cylindrical tube 1 formed in a flat shape, respectively, and the tip writing part 11a of the mechanical pencil unit 11 and the tip writing part of the first ballpoint pen unit 12 are formed. 12a and the tip writing portion 13a of the second ballpoint pen unit 13 are respectively extended from dedicated tip openings 3a to 3c.

  In the second embodiment, the configuration of the knock bar 19 and the lock member 20 employed in the mechanical pencil unit 11 is the same as that shown in FIGS. 5 and 6 already described. Also, the rotational drive mechanism 11d has the same configuration as that shown in FIGS. 7 and 8 already described.

According to the second embodiment, when using either the mechanical pencil unit 11 or the first or second ball-point pen units 12 to 13, the units 11 to 13 are not bent. In the mechanical pencil unit 11 provided with the rotation drive mechanism 11d, a smooth rotation operation of the writing core can be ensured.
In addition, since the mechanical pencil unit 11 is disposed at the shaft center portion of the shaft tube 1, the position of the tip writing portion does not change according to the grip position of the shaft tube, and a comfortable writing feeling is obtained. For example, the same effects as those of the first embodiment described above can be expected.

DESCRIPTION OF SYMBOLS 1 Shaft cylinder 3,3a-3c tip 11 Mechanical pencil unit 11a Tip writing part 11b Chuck mechanism 11d Rotation drive mechanism 12 Ball-point pen unit (1st unit)
12a Tip writing part (ballpoint pen tip)
12c Slide knob 13 Ballpoint pen unit (second unit)
13a Tip writing part (ballpoint pen tip)
13c Slide knob 15 Unit support member 16 Guide cylinder 17, 22, 23 Return spring 19 Knock bar 20 Lock member 20a Release button 23 Rotor 23a First cam surface 23b Second cam surface 24 First fixed cam surface 25 Second fixed cam Surface 26 Torque canceller 27 Cushion spring

Claims (2)

A plurality of writing instruments are accommodated in the shaft cylinder, and from the tip formed at the tip end portion of the shaft cylinder, it is a compound writing instrument capable of feeding out the tip writing section of any one of the writing bodies,
At least one of the plurality of writing bodies is a mechanical pencil unit, and the mechanical pencil unit is configured to retreat the writing core by the writing pressure received by the writing core along with the writing operation, and release the writing pressure. A rotational drive mechanism is provided that receives the forward movement of the writing core and rotationally drives the rotor in one direction, and is configured to transmit the rotational motion of the rotor to the writing core.
In addition, the mechanical pencil unit is disposed at the shaft center portion of the shaft cylinder, and the tip writing portion of the mechanical pencil unit is drawn out from a front opening formed on a line passing through the shaft center portion of the shaft cylinder. A dual-type writing instrument characterized by comprising   The mechanical pencil unit is operated by pushing a knock bar arranged at the rear end portion of the shaft tube, so that the tip writing portion is fed out from the front opening formed in the shaft tube, and is placed on the outer peripheral portion of the shaft tube. 2. The compound writing instrument according to claim 1, wherein the tip writing unit is configured to be accommodated in the shaft tube by operating a release button arranged. 3.

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