JPH06106892A - Mechanical pencil - Google Patents

Abstract

PURPOSE:To provide a mechanical pencil capable of preventing inadvertent feed of lead and also of being formed into a simple design free from a knock cap wherein a chuck body is driven in the longitudinal direction of an internal cylinder to feed the lead. CONSTITUTION:A mechanical pencil is equipped with an intermediate turning body 8 and a transfer member 6 in the longitudinal direction. The intermediate turning body 8 is integrated with a cap 2 and turned. A cam face 8b is formed in the rear surface of the turning body 8 and has a slope part 8c for downward moving a chuck body 5. The transfer member 6 is vertically moved while a projection 6a is guided along a window hole 4a in the longitudinal direction which is formed in an internal cylinder 4. When the transfer member 6 is downward moved, the chuck body 5 is pressed thereby. Further a cam follower 6b is formed on the upper face opposite to the rear surface of the intermediate turning body 8. When the cap 2 is turned, the transfer member 6 in the longitudinal direction is converted into rectilinear movement by the action of the cam face 8b and the cam follower 6b and the chuck body 5 is driven.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention enables a core to be extended by a predetermined length by driving a chuck body in an inner cylinder in a longitudinal direction of the inner cylinder in accordance with a turning operation of a cap. The drawn-out type writing instrument.

[0002]

2. Description of the Related Art Heretofore, as this kind of feeding type writing instrument,
For example, by knocking a knock cap protruding from the upper end of the barrel downward, the chuck body provided in the writing instrument is moved downward, and the lead is extended from the lower end of the writing instrument by a predetermined length, or a rotatable cap. In addition to forming a spiral groove on the inner peripheral surface of the, the spiral groove is provided with a sliding piece guided in the longitudinal direction of the writing instrument, and by rotating the cap, the sliding piece is moved downward, There is a wick that extends from the lower end of the writing instrument that interlocks with.

[0003]

However, in the case where the lead is extended by the knock operation of the knock cap, the knock cap is in a protruding state, so that the knock cap is pressed by vibration or the like, and the lead is not properly attached. It may be easily paid out, and in the case where the lead is drawn out by the movement of the sliding piece due to the rotation of the cap, it is difficult to adjust because the lead-out amount is proportional to the turning angle of the cap. There is a problem in that the procedure for integrating the sliding piece and the core in order to link them is troublesome.

Therefore, in the present invention, the rotation of the cap is converted into the linear movement of the longitudinal moving member to drive the chuck body, thereby preventing the lead from being unnecessarily extended due to the pressing of the knock cap and the lead. It is an object of the present invention to provide a feeding-type writing instrument that can feed out a predetermined length.

[0005]

In the feed-out type writing instrument of the present invention, the chuck body first moves downward in the inner cylinder against the elastic force while the core is clamped with the turning operation of the cap. This is a rotary writing instrument in which the core is pushed down by a predetermined length, and then the chuck body is returned to the upper side based on the elastic force without the core being clamped. Then, on the lower surface, a cam surface having at least an inclined surface portion for moving the chuck body downward, and an intermediate rotating body having one of a cam follower corresponding to the cam surface, and a peripheral surface of the inner cylinder are formed. The guided portion (eg, projection) is vertically guided by the guide portion (eg, window hole), vertically moves, presses the chuck body when moving downward, and faces the lower surface of the intermediate rotating body. The cam surface and cover A longitudinal moving member that forms one of the other of the followers is provided, and by the action of the cam surface and the cam follower, the turning operation of the cap is converted into the linear movement of the longitudinal moving member to drive the chuck body. It is a thing.

Further, a cam surface formed on either the intermediate rotating body or the longitudinal moving member is provided with a slope portion for lowering the chuck body, and a step portion for returning operation following the slope portion. It is the one.

[0007]

As described above, by forming the cam surface on one of the intermediate rotating body and the longitudinal moving member and forming the cam follower on the other side, when the cap is rotated, the cap rotates integrally with the cap. The moving body also rotates, and this rotation is converted into linear movement of the longitudinal moving member downward and upward by the action of the cam surface and the cam follower, and the vertical movement of the chuck body is caused by the linear movement of the longitudinal moving member. As a result, the lead is fed out by a predetermined length.

That is, when the cap is rotated to a predetermined angle, the cam follower is pressed by the inclined surface of the cam surface to move the longitudinal moving member downward, and the chuck body is moved downward against the elastic force. Then open the cap,
When the longitudinal moving member is urged upward, the cam follower presses the inclined surface portion to rotate the intermediate rotating body,
The chuck body is moved upward along with the longitudinal moving member, and the core is paid out by a predetermined length by the vertical movement of the chuck body.

Further, in the case where the cam surface is provided with a step portion for the returning operation following the inclined surface portion, the upward movement of the longitudinal moving member which is moved downward by the inclined surface portion during one rotation of the cap. The stepped portion is secured at least once, and the vertical movement of the longitudinal moving member causes the chuck body to move up and down, whereby the core is fed out by a predetermined length.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS. In the figure, 1 is a barrel, 2 is a cap, 2
a is a cylindrical portion, 3 is a connecting member, 4 is an inner cylinder, 4a is a window hole (guide portion), 4b is a locking step portion, 4c is an upper end, 5 is a chuck body, 5a is a flange portion, and 5b is a coil spring. , 6 is a longitudinal moving member, 6a is a projection (guided portion), 6b is a cam follower, 6c is a cutout portion, 7 is a coil spring, 8 is an intermediate rotating body, 8a is an annular protruding portion, 8b is a cam surface, 8c. Is an inclined surface portion, 8d is a stepped portion, 8e is an upper portion, 9 is a holding member, 10 is an insertion tube, 10a is a convex portion, and 11 is a core.

A connecting member 3 is fixed to the upper end of the shaft cylinder 1, and an inner cylinder 4 is attached to the connecting member 3 by screw connection. At this time, the lower end of the inner cylinder 4 is
Is protruding from the lower end of. And the inner cylinder 4
A chuck body 5 is set in the interior of the inner cylinder 4 with the coil spring 5b interposed therebetween. When the chuck body 5 moves downward against the coil spring 5b, the core 11 can be fed out from the lower end of the inner cylinder 4 by a predetermined length by the action with the lower portion of the inner cylinder 4.

Next, a projection 6a is formed in the window hole 4a of the inner cylinder 4 on the upper side of the collar portion 5a provided in the substantially central portion of the chuck body 5.
Is guided, the longitudinal movement member 6 is set in a state where the rotational movement is restricted. As shown in FIG. 2, the longitudinal moving member 6 has a cam follower 6b on the upper surface and a cutout portion 6c cut out downward from the upper surface.
Further, a coil spring 7 is provided between the inner cylinder 4 and the locking step portion 4b so that the upward biasing is positively performed.

Next, an intermediate rotating body 8 is set above the longitudinal moving member 6, and the intermediate rotating body 8 is
As shown in FIG. 2, a cam surface 8b including a sloped portion 8c and a stepped portion 8d is formed on the lower surface, and the cam surface 8b comes into contact with the cam follower 6b of the longitudinal moving member 6. There is. In addition, the intermediate rotating body 8 and the longitudinal moving member 6 are formed in a tubular shape, and the upper portion of the chuck body 5 is penetrated therein.

Further, the intermediate rotating body 8 has an annular protruding portion 8a.
Is set so as to be sandwiched between the upper end 4c of the inner cylinder 4 and the holding member 9, so that the inner cylinder 4 is rotatable with respect to the inner cylinder 4 and the movement of the inner cylinder 4 in the longitudinal direction is restricted. It is in a state of An insertion tube 10 having a plurality of outwardly protruding projections 10a is fixed to the outer peripheral surface of the upper portion 8e of the intermediate rotating body 8 above the holding member 9 (the portion protruding from the inner cylinder 4). .

Further, the cap 2 is provided with a tubular portion 2a inside thereof in an integrated state.
By elastically fitting the insertion tube 10 into a, the cap 2 is held by the barrel 1 via the tubular portion 2a, and when the cap 2 is further rotated with respect to the barrel 1. Since the cylindrical portion 2a and the insertion tube 10 are elastically engaged with each other, the intermediate rotating body 8 is rotated with respect to the inner cylinder 4.

As a result, when the cam surface 8b is rotated from the state shown in FIG. 3 (a), the cam follower 6b is moved along the inclined surface portion 8c. Therefore, the cam follower 6b is pushed downward with the inclination of the inclined surface portion 8c, and the longitudinal movement member 6 is
As shown in FIG. 3B, the coil spring 7 moves downward against the bias of the coil spring 7.

That is, the intermediate rotating body 8 whose longitudinal movement is restricted moves downward the longitudinal moving member 6 whose rotation is restricted by the engagement between the projection 6a and the window hole 4a. At the lower end of the moving member 6, the collar portion 5a of the chuck body 5
Is pressed downward, whereby the chuck body 5 moves downward with respect to the inner cylinder 4 while holding the core 11 against the bias of the coil spring 5b, and pushes down the core 11. There is. The chuck body 5 releases the nipping of the core 11 by the action of the inner cylinder 4 when the chuck body 5 moves downward by a certain distance.

When the projection 6a is locked to the lower end of the window 4a and the downward movement of the longitudinal moving member 6 is restricted, the rotation of the cap 2 is locked at this point. At this time, the cam follower 6b has not reached the lowest point of the slope 8c. Subsequently, when the cap 2 is opened, the longitudinal moving member 6 is moved upward by the bias of the coil spring 7, whereby the cam follower 6b presses the inclined surface portion 8c to move the intermediate rotating body 8 (and the cap 2). While rotating to the original state, the chuck body 5 returns upward due to the bias of the coil spring 5b, and as a result, as shown in FIG.
Return to the state shown in.

At this time, the chuck body 5 alone moves upward based on the urging force of the coil spring 5b without holding the core 11, that is, without holding the pushed down core 11 and moving it upward. As a result, the core 11 that has been pushed down remains as it is, and after the chuck body 5 returns upward, this core 11
By pinching 11 again, the lead 11 is kept in the extended state.

By repeating such a rotating operation of the cap 2 up to a predetermined angle (for example, 90 °), the core 11
Will be paid out by a predetermined length. In addition, when storing the extended lead 11, the cap 2 is rotated to move the chuck body 5 downward, and when the nipping of the lead 11 is released, the rotation of the cap 2 is stopped, and in this state, By immersing the inside of the inner cylinder 4.

Since the projection 6a is locked to the lower end of the window portion 4a to prevent the longitudinal moving member 6 from moving downward by a predetermined distance, the cam follower 6b is provided only on the inclined surface portion 8c of the cam surface 8b. Therefore, the portion other than the inclined surface portion 8c, that is, the stepped portion 8d can have an arbitrary shape.

Next, when the longitudinal moving member 6 is moved downward,
In the case where the projection 6a is not locked to the lower end of the window 4a, the cam surface 8b of the intermediate rotating body 8 has a slanted surface 8a.
c and a stepped portion 8d having a predetermined depth from the lowest point of the sloped portion 8c are formed, and when the cap 2 is rotated to rotate the cam surface 8b, the cam follower 6b moves from the sloped portion 8c to the stepped portion. 8d
The cam follower 6b is released from the pressing by the inclined surface portion 8c, and the longitudinal moving member 6 is returned upward by the bias of the coil spring 7, and the chuck body 5 and the coil spring 5b are also moved. It returns upward due to the bias.

Therefore, by repeating the turning operation of the cap 2 in the same direction, the core 11 is fed out by a predetermined length. In this case, as a method for feeding the lead 11, the vertical movement of the longitudinal moving member 6 can be performed not only by rotating the cap 2 in the same direction but also by rotating the cap 2 up to a predetermined angle. By ensuring that, the core 11 can be extended even by this method.

Although shown in the figure, the cam surface 8b of the intermediate rotating body 8 is set so that the reciprocating motion of the longitudinal moving member 6 is performed once per one rotation of the cap 2.
However, the present invention is not limited to this, and the cam surface 8b is provided with a plurality of inclined surface portions 8c and a step portion 8d for return so that the longitudinal movement member 6 can be reciprocated a plurality of times per one rotation of the cap 2. May be.

Further, instead of forming the cam surface 8b on the lower surface of the intermediate rotating body 8 and the cam follower 6b on the upper surface of the longitudinal moving member 6 as shown in the figure, the cam follower on the lower surface of the intermediate rotating body 8 is replaced. 6b may be formed with cam surfaces 8b on the upper surface of the longitudinal moving member 6, respectively, and instead of forming the window hole 4a in the inner cylinder 4 and the projection 6a in the longitudinal moving member 6. The inner cylinder 4 may be formed with a projection as a guide portion, and the longitudinal movement member 6 may be formed with a window hole as a guided portion.

[0026]

According to the present invention, the cam surface is formed on one side and the cam follower is formed on the other side of the intermediate rotating body that rotates integrally with the cap and the longitudinal moving member that moves up and down in the longitudinal direction. By the action of the cam surface and the cam follower, the rotation of the cap is converted into the linear movement of the longitudinal moving member to drive the chuck body and to extend the core by a predetermined length. The projecting knock cap is not required, and it is possible to prevent the core from being unintentionally paid out by pressing this knock cap due to vibration, etc., and since there is no projecting knock cap, it is possible to simplify the design. .

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing an intermediate rotating body and a longitudinal moving member.

FIG. 3 is a cross-sectional view showing a movement state of a cam follower by a cam surface, (a) shows a cam follower moving upward, and (b) shows a cam follower moving downward.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Shaft cylinder 2 ... Cap 2a ... Cylindrical part 3 ... Connection member 4 ... Inner cylinder 4a ... Window hole (guide part) 4b ... Lock step 4c ... Upper end 5・ ・ ・ Chuck body 5a ・ ・ ・ Collar part 5b ・ ・ ・ Coil spring 6 ・ ・ ・ Longitudinal moving member 6a ・ ・ ・ Protrusion (guided part) 6b ・ ・ ・ Cam follower 6c ・ ・ ・ Notch part 7 ・ ・ ・ Coil spring 8. ..Middle rotating body 8a..annular protrusion 8b..cam surface 8c..slope 8d..step 8e..upper 9 ... holding member 10 ... insertion tube 10a..projection 11 .. ·core

Claims (2)

[Claims] Along with the turning operation of the cap (2),
First, the chuck body (5), which is urged upward by elastic force,
While holding the core (11), the core (11) is pushed down by a predetermined length by lowering the inside of the inner cylinder (4) in the longitudinal direction against the elastic force, and then the chuck body (5) ), Without holding the pushed down core (11) and moving it up,
A rotary writing instrument which is adapted to independently return upwards based on the elastic force, and rotates integrally with the cap (2), and the chuck body (5) is provided on the lower surface of the longitudinal member. A cam surface (8b) having at least a slope (8c) for moving in the direction, and an intermediate rotating body (8) having one of a cam follower (6b) corresponding to the cam surface (8b) and While the guided portion (6a) is guided by the guide portion (4a) formed on the peripheral surface of the inner cylinder (4), the guided body (6a) moves up and down in the longitudinal direction. Press (5),
The upper surface facing the lower surface of the intermediate rotating body (8) is provided with a longitudinal moving member (6) forming the other of the cam surface (8b) and the cam follower (6b). By the action of (8b) and the cam follower (6b), the turning operation of the cap (2) is performed by the longitudinal movement member (6).
The writing instrument according to the present invention is characterized in that the chuck body (5) can be driven by converting the movement into a linear movement. 2. With the turning operation of the cap (2),
First, the chuck body (5), which is urged upward by elastic force,
While holding the core (11), the core (11) is pushed down by a predetermined length by lowering the inside of the inner cylinder (4) in the longitudinal direction against the elastic force, and then the chuck body (5) ), Without holding the pushed down core (11) and moving it up,
A rotary writing instrument which is adapted to independently return upwards based on the elastic force, and rotates integrally with the cap (2), and the chuck body (5) is provided on the lower surface of the longitudinal member. Cam surface (8b) having a slope portion (8c) for moving downward in the direction and the step portion (8d) for the return operation following this, and a cam follower (6b) corresponding to the cam surface (8b). Intermediate rotating body (8) forming either one of
And the guided portion (6a) is guided by the guide portion (4a) formed on the peripheral surface of the inner cylinder (4), and vertically moves in the longitudinal direction. Press the body (5),
The upper surface facing the lower surface of the intermediate rotating body (8) is provided with a longitudinal moving member (6) forming the other of the cam surface (8b) and the cam follower (6b). By the action of (8b) and the cam follower (6b), the turning operation of the cap (2) is performed by the longitudinal movement member (6).
The writing instrument according to the present invention is characterized in that the chuck body (5) can be driven by converting the movement into a linear movement.