JP2532321Y2 - Paper fixing device for plotter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application field] The present invention relates to a plotter that receives a signal from an external processing device or the like and records a predetermined image on recording paper.
In particular, the present invention relates to a sheet fixing device of a plotter having a recording table.

[Prior Art] A plotter which places a sheet on a drawing table and draws a predetermined image on the sheet is widely used.

In this case, if the sheet moves while drawing a record with a plotter pen or the like, a target image cannot be obtained. To prevent this, it is necessary to fix the recording paper on the table by some means.

As a conventional typical means, there is a paper fixing device utilizing an electrostatic attraction action.

FIGS. 4 and 5 are schematic diagrams of a plotter using this electrostatic suction type paper fixing device. FIG. 4 shows a mechanical configuration, and FIG. 5 shows an electrical configuration.

As shown in FIG. 4, the general recording table 3 of the plotter includes a table body 33, an electrostatic suction plate 32, and a table cover 31. The electrostatic attraction plate 32 includes a plurality of electrodes 323 embedded in the insulating layer 322 (the electrodes include substantially the same number of positive and negative electrodes) and a dielectric layer 321. ing.

By placing the paper 2 on the recording table 3 and applying a high voltage to the electrode group 323, the paper 2 can be suction-held.

As shown in FIG. 5, when a drawing command is input from an external device to the control circuit 41 of the plotter 4 (the control circuit includes the CPU 410, the RAM 411, and the ROM 412), a predetermined command is generated in the control circuit 41. The processing is performed to cause the plotter pen 1 coupled to the pen driving mechanism 43 via the pen driving circuit 44 to perform predetermined recording.

Note that the sheet suction operation shown in FIG. 4 is performed by a user of the normal plotter in response to a suction ON / OFF command prior to recording. A user of the plotter issues a command by operating a suction on / off switch (not shown) provided on the control panel 40. When the control circuit 41 receives the suction command, a high voltage is applied to the electrostatic suction plate 32 via the suction control circuit 46.

[Problems to be Solved by the Invention] By the way, such a conventional paper fixing device is configured to generate a suction force enough to sufficiently suction and fix a standard paper. That is, the suction force could not be varied. For this reason, for example, when a thin sheet of paper having a relatively weak suction force is used, for example, there is a problem that the suction force is too strong and the paper is wrinkled. Also,
For example, when the paper is to be slightly shifted when the paper is fixed, there is an inconvenience that the suction force is large, and it is necessary to temporarily stop the suction and fix the paper again from the beginning.

The present invention aims to improve this point.

[Means for Solving the Problems] For this reason, in the present invention, means for changing the suction force in multiple stages is provided in the suction fixing device.

[Operation] Since the suction force can be made variable, an appropriate suction force can be generated according to the type of paper.

Embodiments FIGS. 1A and 1B are explanatory diagrams showing one embodiment in the case where an electrostatic attraction plate is used as an attraction and fixing device.

First, the embodiment shown in FIG. 1A will be described. When the user selects a high suction force generating switch provided on a control panel (not shown), the control circuit 41 activates the high voltage source 47. The high voltage generated by the high voltage source 47 is applied to the suction control circuit 46.
As a result, a strong attraction force is applied to the electrostatic attraction plate 32.

On the other hand, when the user selects the low suction force switch, the control circuit 41 activates the low voltage source 48. The low voltage from the low voltage source 48 is now applied to the electrostatic attraction plate 32 via the attraction control circuit 46 to generate a weak attraction force.

In the embodiment shown in FIG. 1A, the voltage applied to the electrostatic attraction plate 32 is switched between high and low levels. However, by providing a plurality of voltage sources, it is possible to vary the attraction force in multiple steps.

Further, in this case, a configuration may be adopted in which a plurality of changeover switches are not provided and only one switch is used to sequentially operate the switches to perform switching.

The embodiment shown in FIG.1B is configured to continuously apply a high voltage when generating a high attraction force, and intermittently apply a high voltage when generating a low attraction force. . The control circuit 41 determines whether the suction command is a high suction force or a low suction force, continuously generates an ON signal when generating a high suction force, and generates an ON signal when generating a low suction force. Generates a pulsed signal. Also in this case, it is possible to generate a multi-stage adsorption force by appropriately adjusting the intermittent high voltage application time, that is, by changing the ON time per cycle of the pulse signal. By adopting a configuration in which the suction force can be controlled in multiple stages, an optimum suction force for the recording paper can be selected.

FIG. 2 shows a state in which the user operates the low suction force switch to correct a slight deviation of the sheet when the sheet is fixed in these embodiment apparatuses. Temporarily weak adsorption force periods can be generated. Specifically, the user activates the low suction force switch at an arbitrary time (the time indicated by reference character a). As a result, the suction force of the recording paper decreases by a predetermined amount. In this state, the user corrects the deviation of the recording paper, and at the time when the correction is completed (at the time indicated by reference character b), activates the high suction force switch to fix the recording paper. As a result, the recording paper can be easily positioned, and the usability is improved.

FIG. 3 shows an embodiment using an air suction type suction fixing device.

For example, a plurality of fans 35a to 35c are provided in the suction suction plate 34 of the recording table 3, and the fan control circuit 50 is configured to stop one of the fans 35 or to change the suction force of the fans 35. Things. That is, the fan control circuit 50 operates the three fans 35a to 35c when a high suction force is required, and operates only one of the three fans (for example, 35b) when a low suction force is required. Let it. When an intermediate suction force is required, two fans (for example, 35a and 35c) are operated. In the above description, the suction force is changed by switching the operation / non-operation of a plurality of fans. However, the suction force may be changed by increasing or decreasing the rotation speed of each fan. Of course. In these configurations, it is possible to cope with different types of recording paper and to facilitate the operation of positioning the recording paper, as in the previous embodiment.

[Effects of the Invention] As described above, according to the present invention, the suction force of the suction fixing device attached to the plotter can be varied in multiple stages, so that an appropriate suction force can be selected according to the paper and the paper can be selected. There is an advantage that it is possible to cope with a case where it is desired to temporarily reduce the suction force, such as when correcting a deviation.

[Brief description of the drawings]

FIGS. 1, 2 and 3 are explanatory views showing one embodiment of the present invention, respectively, and FIGS. 4 and 5 are explanatory views showing a conventional apparatus. 32: Electrostatic suction plate, 46: Adsorption control circuit 41: Control circuit 35: Fan, 50: Fan control circuit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshiaki Iwata 3-19-6 Nishishinagawa, Shinagawa-ku, Tokyo Examiner, Graphtec Co., Ltd. Examiner Yasushi Miyazaki (56) References JP-A-61-273448 (JP, A JP-A-3-143697 (JP, A) JP-A-1-145493 (JP, U)

Claims (3)

(57) [Scope of request for utility model registration] 1. A sheet fixing device of a plotter for recording a predetermined image on a recording sheet placed on a drawing table, the sheet fixing device comprising: an electrostatic suction plate incorporated in the drawing table; A high voltage source for applying a high voltage to the electrostatic chuck plate, a low voltage source for applying a voltage lower than the high voltage to the electrostatic chuck plate, and the high voltage source and the low voltage source A sheet fixing device for a plotter, comprising connection switching means for selectively connecting to a suction plate, wherein the suction force of the sheet fixing device is made variable according to an instruction of an operator. 2. A sheet fixing device of a plotter for recording a predetermined image on a recording sheet placed on a drawing table, wherein the sheet fixing device comprises: an electrostatic suction plate incorporated in the drawing table; A high voltage source for applying a high voltage to the electrostatic suction plate, and a first voltage source for continuously connecting the high voltage source to the electrostatic suction plate to continuously apply a high voltage to the electrostatic suction plate. Means, and second means for intermittently connecting the high voltage source and the electrostatic attraction plate to on and off to apply a high voltage to the electrostatic attraction plate intermittently. A sheet fixing device for a plotter, wherein the suction force of the sheet fixing device is made variable according to the position. 3. The apparatus according to claim 2, wherein said second means is adapted to generate a multi-stage suction force by adjusting an intermittent high voltage application time in accordance with an instruction of an operator. Paper fixing device for the plotter described in the above.