JP2514485B2 - Lead pen for plotter - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lead pen used in plotters such as XY plotters, and more particularly to a structure of a lead pen for improving the quality of plot images.

[0002]

As is well known, in an XY plotter, a lead carriage (pencil lead pen) may be held on a pen carriage that receives a position signal from a computer or the like, and an image signal may be recorded by the lead X of the lead pen. That is, FIGS. 4 and 5 show a lead pen used for such a purpose, in which a hollow middle cylinder 2A is incorporated in a pen body 1A held by a pen carriage (not shown).
Although not shown, the upper end of the middle cylinder 2A is connected to a lead cartridge containing a plurality of leads X. Further, a cylindrical cap guide 3A protruding downward from the tip of the pen body 1A is screwed to the tip (lower end) of the middle cylinder 2A, and one is provided at the center of the middle cylinder 2A. An insert 6A having a chuck 4A capable of penetrating only the lead X and a chuck ring 5A surrounding the tip 4a of the chuck 4A is housed. That is, the lead cartridge and the upper end of the chuck 4A are fixed to a knock button (not shown), and by pressing the knock button, the chuck 4A is moved in the longitudinal direction of the pen body 1A to move the tip 4a of the chuck 4A. Is released from the chuck ring 5A. Inside the mouthpiece guide 3A described above, a mouthpiece sleeve 7A that is vertically movable along the mouthpiece guide 3A is arranged, and the mouthpiece sleeve 7A that guides the tip end of the lead X is attached to the insert 6A. The urging spring 9A interposed between the core guide 8A and the fitted core guide 8A urges it downward, that is, in a direction projecting from the mouthpiece guide 3A. Further, a detent rubber 10A for stopping the protrusion of the sleeve sleeve 7A toward the tip end due to the frictional force with the lead X fed from the chuck 4A is arranged at the lower center of the sleeve sleeve 7A.

Since the conventional lead pen has the structure as described above, the state shown in FIG. 5A is obtained during the plotting operation. That is, the lead X clamped by the chuck 4A is placed in the penetrating sleeve 7A,
Pen down signal from pen carriage to pen body 1A
A certain downward writing pressure is applied to. For this reason,
The tip of the lead X protruding from the base sleeve 7A is pressed against the surface of the recording paper Y with a certain writing pressure to make a predetermined point plot. However, when the lead X is consumed, the force of the biasing spring 9A is resisted. As the base sleeve 7A is raised with respect to the pen body 1A, the tip of the lead X is always attached to the base sleeve 7A.
Is kept protruding. In the position where dot plotting is not performed, the pen body 1A is raised by a slight distance L by the pen-up signal as shown in FIG. 5 (b). Since X also rises by the distance L from the surface of the recording paper Y, unnecessary lines and points are not plotted on the surface of the recording paper Y.

[0004] In the Ridopen as described above, as shown in FIG. 5 (c), despite there exists a preceding read X ₁ in the interior of the cap sleeve 7A, trailing lead chuck 4A X ₂ is supplied and this subsequent lead X
₂ may be continuous with the lead X ₁ , and may be clamped by the chuck 4A. In such a case, the leading lead X ₁ is pushed by the succeeding lead X ₂ and cannot be determined to be an abnormal state such as "no core".
It is possible to make a point plot normally.

[0005]

[SUMMARY OF THE INVENTION However, in this core a continuous state, the pen-up signal, as shown in FIG. 5 (d) shows, also raises the pen body 1A by a distance L, the preceding lead X ₁ subsequent Since the lead X ₂ is physically disconnected from the lead X ₂ , the tip of the base sleeve 7A and the leading lead X ₁ is kept pressed against the surface of the recording paper Y by the force of the biasing spring 9A. As a result, in the case of the movement of the pen carriage, with the base sleeve 7A and the leading ends of the leading leads X ₁ kept pressed against the surface of the recording paper Y,
Since the lead pen is moved in parallel with the surface of the recording paper Y, useless lines are recorded on the surface of the recording paper Y during this movement. The object of the present invention takes into consideration the problems of the conventional lead pens for plotters as described above, and is caused by the fact that the trailing lead is clamped to the chuck despite the presence of the leading lead in the base sleeve. An object is to obtain a lead pen structure that can prevent deterioration of recording image quality.

[0006]

To achieve this object, according to the present invention, a chuck for clamping a lead is incorporated inside a pen body attached to a pen carriage of a plotter, and a tip of the pen body is provided with a chucking direction. In a lead pen of a plotter having a cap sleeve with a detent rubber for guiding the tip of the lead pressed by a biasing spring and clamped by the chuck ring, the cap is slidable in the length direction of the lead X. A plotter in which a contact ring is attached to the tip portion of the sleeve, and the contact ring is pressed in a direction projecting from the tip surface of the mouth sleeve by a pressing spring stronger than the biasing spring interposed between the sleeve and the sleeve. This is a proposal for the lead pen.

[0007]

Embodiments of the present invention will be described in detail below with reference to FIGS. 1 to 3. FIG. 1 is an enlarged cross-sectional view of a main part of a lead pen according to the present invention. Inside a pen body 1 held by a pen carriage (not shown), a hollow middle cylinder 2 is incorporated in the same manner as in a conventional case. Although not shown, the upper end of the tube 2 is connected to a lead cartridge containing a plurality of leads X. A cylindrical cap guide 3 projecting downward from the tip of the pen body 1 is screwed to the tip (lower end) of the middle cylinder 2, and one is provided at the center of the middle cylinder 2. The insert 6 having the chuck 4 capable of penetrating only the lead X and the chuck ring 5 surrounding the tip of the chuck 4 is accommodated. That is, the lead cartridge and the upper end of the chuck 4 are fixed to a knock button (not shown), and by pressing the knock button, the chuck 4 is moved in the length direction of the pen body 1 so that the tip of the chuck 4 is moved. The chuck ring 5 is released. Inside the mouthpiece guide 3 described above, a mouthpiece sleeve 7 that is vertically movable along the mouthpiece guide 3 is arranged, and the mouthpiece sleeve 7 that guides the tip portion of the lead X is attached to the insert 6. Downward by the force of the biasing spring 9 interposed between the fitted core guide 8 and
That is, it is urged in the direction of protruding from the mouthpiece guide 3. Further, the base sleeve 7 has a lower center of the base sleeve 7 due to a frictional force with the lead X fed from the chuck 4.
A detent rubber 10 is arranged to prevent the protrusion of the above in the direction of the tip.

In the present invention, the contact ring 11 is used which is movable in the vertical direction along the tip end portion 7a of the mouthpiece sleeve 7 having the reduced diameter. That is, this contact ring 11
Is fixed to the inner peripheral surface of the pressing ring 12 having the brim 12a in a state of surrounding the front end hole 7b of the base sleeve 7 from which the tip of the lead X is projected. The pressing ring 12 is the front end of the base sleeve 7. It is built in the retainer 13 with the inner peripheral flange 13a that is fixed to the inside of the retainer 13 in a state in which it is prevented from falling off. A pressure spring 14 stronger than the biasing spring 9 is interposed between the step surface 7c of the mouth sleeve 7 and the flange 12a of the pressure ring 12, and the force of the pressure spring 14 causes the contact ring 1 to move.
1 is kept protruding from the lower end surface 7d of the mouthpiece sleeve 7 as shown in FIG.

Since the lead pen of the plotter according to the illustrated embodiment has the above-described structure, the state shown in FIG. 2A is obtained during the plotting operation. That is, the lead X clamped on the chuck 4 is placed in the penetrating sleeve 7 in a penetrating state, and a constant downward writing pressure is applied from the pen carriage to the pen body 1 by the pen down signal. Therefore, the tip of the lead X protruding from the base sleeve 7 is pressed against the surface of the recording paper Y with a constant writing pressure to perform a predetermined point plot, but when the lead X is consumed, the force of the biasing spring 9 is increased. Against this, since the base sleeve 7 is raised with respect to the pen body 1 and the pressing spring 14 is compressed by the writing pressure, the tip of the lead X is always maintained in a state of protruding from the base sleeve 7. At the position where dot plotting is not performed, the pen body 1 is lifted by a slight distance L by the pen-up signal as shown in FIG. 5 (b). X is also raised by a distance L from the surface of the recording paper Y, so that the recording paper Y
No unwanted lines or points are plotted on the surface of. Of course, at the time of pen-up, the lower end surface of the base sleeve 7 is separated from the surface of the recording paper Y, so that the contact ring 11 projects from the lower end surface of the base sleeve 7 by the force of the pressing spring 14.

Further, in the same lead pen, as shown in FIG.
As shown in the preceding inside the cap sleeve 7 leads X ₁
The lead X on the chuck 4 despite the existence of
_In some cases, ₂ is supplied, and this succeeding lead X ₂ is continuous with the preceding lead X ₁ and is clamped by the chuck 4. In this case, as shown in FIG. 3 (a), the lead lead X ₁ is pushed by the follower lead X ₂ and is not in an abnormal state such as "no core". It is possible to plot.

In this lead-continuous state, the pen-up signal causes the pen body 1 to move to a distance L as shown in FIG. 3 (b).
Even if it is only raised, since the lead lead X ₁ and the follower lead X ₂ are physically disconnected, the base sleeve 7 is biased downward by the force of the biasing spring 9 and the pressing spring 1 is pressed.
The contact ring 11 is pressed downward against the base sleeve 7 by the force of 4. Therefore, as described above, since the force of the pressing spring 14 is stronger than the force of the biasing spring 9, only the contact ring 11 comes into contact with the surface of the recording paper Y, and the leading end of the leading lead X ₁ becomes the recording paper. Contact with the surface of Y is prevented. As a result, when the pen carriage is moved, only the contact ring 11 is pressed against the surface of the recording paper Y, the tip of the base sleeve 7 and the leading lead X ₁ are not in contact, and the lead pen moves the recording paper Y. Since it is moved parallel to the surface of the recording sheet Y, unnecessary lines are not recorded on the surface of the recording paper Y during this movement.

[0012]

As is apparent from the above description, according to the present invention, the lead pen by the pen carriage can be used even when the trailing lead is clamped to the chuck despite the presence of the leading lead in the base sleeve. It is possible to obtain a lead pen in which unnecessary lines are not recorded during the movement of the.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view of a main part of a lead pen of a plotter according to the present invention.

FIG. 2A and FIG. 2B are cross-sectional views of the lead pen in a leaded state.

3 (a) and 3 (b) are sectional views for explaining the operation of the lead pen in the case where the lead lead exists in the base sleeve.

FIG. 4 is an enlarged cross-sectional view of a main part of a lead pen of a conventional plotter.

5A to 5D are sectional views for explaining the operation of the lead pen.

[Explanation of symbols]

 1 Pen body 3 Base guide 4 Chuck 5 Chuck ring 7 Base sleeve 9 Energizing spring 10 Detent rubber 11 Contact ring 13 Retainer 14 Pressing spring X Lead Y Recording paper

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yasuhiro Iwase 1-41 Kugayama, Suginami-ku, Tokyo Iwasaki Tsushinki Co., Ltd. (72) Inventor Tadayoshi Axbayashi 1-chome, Kugayama, Suginami-ku, Tokyo No. 7-41 Iwasaki Tsushinki Co., Ltd. (72) Inventor Hiroshi Sumita 1667 Tamura, Hiratsuka City, Kanagawa Prefecture Pilot Precision Co., Ltd. (72) Kazuhiko Ono 1667 Tamura, Hiratsuka City, Kanagawa Prefecture Pilot Precision Co., Ltd.

Claims (1)

(57) [Claims] 1. A chuck for clamping a lead is built into a pen body attached to a pen carriage of a plotter, and a tip of the pen body is pressed by a biasing spring in a protruding direction and clamped by the chuck ring. In a lead pen of a plotter having a cap sleeve with a detent rubber that guides the tip of the lead, a contact ring is attached to the tip of the cap sleeve so as to be slidable in the length direction of the lead. A lead pen for a plotter, wherein the contact ring is pressed in a direction projecting from the tip end surface of the mouth sleeve by a pressing spring stronger than the biasing spring interposed in the pen.