JP2717153B2 - Method for controlling electrostatic attraction force in automatic drafting machine - Google Patents

Description

The present invention relates to a method for controlling an electrostatic attraction force in an automatic drafting machine.

[Conventional technology]

Japanese Patent Application Laid-Open No. 63-149174 discloses a configuration in which an electrostatic attraction force is varied in an automatic drafting machine that uses an electrostatic attraction plate to fix a sheet thereon. However, this publication does not disclose a technical idea of appropriately changing the electrostatic attraction force using cut paper or roll paper.

[Problems to be solved by the invention]

In the case of drawing using roll paper, the roll paper is tensioned and stretched tight on the electrostatic attraction plate. Fixedly adhere to the drawing. However, in the case of using roll paper, if the electrostatic attraction force is increased as in the case of using cut paper, even if the attraction force is turned off, the roll paper does not separate while remaining in close contact with the electrostatic adsorption surface due to the residual charging of the electrostatic attraction surface.
There is a defect that it takes a long time until the sheet can be conveyed. An object of the present invention is to eliminate the above defects.

[Means for Solving the Problems] In order to achieve the above object, the present invention develops roll paper or cut paper on an electrostatic attraction plate, and applies these sheets to the electrostatic attraction force of the electrostatic attraction plate. An automatic drafting machine fixed to a plate and drawing on the paper detects whether the paper on the electrostatic suction plate is roll paper or cut paper, and when using cut paper, the suction force of the electrostatic suction plate is detected. At the time of continuous drawing with a strong or roll paper, the above-mentioned suction force is made weak.

〔Example〕

Hereinafter, the configuration of the present invention will be described in detail with reference to embodiments shown in the accompanying drawings.

In FIG. 2, reference numeral 2 denotes a body of an automatic drafting machine, on which a table 4 is fixed, and on a top surface of the table 4, a known electrostatic suction plate 6 for fixing paper by suction is fixed. . Above the electrostatic attraction plate 6, a drawing head 8 is supported by a well-known XY rail support mechanism so as to be able to move parallel thereto. A roll paper supply device 10 and a roll take-up device 12 are provided at the front and rear portions of the body 2. A roll paper 14 is rotatably supported by the roll paper supply device 10. The roll paper 14 is developed on the electrostatic attraction plate 6 and wound up by the roll paper winding device 12. Reference numeral 16 denotes a paper type detection sensor disposed between the side surface of the table 4 and the roll paper take-up device 12, and when the paper is spread on the electrostatic suction plate 6, the controller detects that the sensor 16 When it is on, it can be recognized that the type of paper on the electrostatic suction plate 6 is roll paper, and when it is off, it is cut paper. As shown in FIG. 3, a first electrode 18 and a second electrode
When the first and second electrodes 18 and 20 are energized, a normal mode in which the electrostatic force is strong is applied, and only the first electrode 18 is energized to place the first and second electrodes 18 and 20 on the electrostatic attraction plate 6. A case where a relatively weak suction force is generated is set as a weak mode. The movement of the drawing head 8 of the automatic drafting machine in the X-Y direction, the up / down movement of the pen, the roll paper winding device 12, the mode of the suction force of the electrostatic suction plate 6, and the like are controlled by the controller including the computer of the automatic drafting machine. (Not shown).

Next, the operation of the automatic drafting machine controller will be described with reference to FIG.

The drawing start operation is started from the label 1, and the controller determines in a decision block 2 whether or not the electrostatic attraction force automatic mode is set. If the judgment is affirmative, the output state of the sheet type detection sensor 16 is detected in block 3 and the judgment block 4 judges whether the sheet spread on the electrostatic attraction plate 6 is a cut sheet. If the determination is affirmative, the controller sets F to the normal electrostatic attraction force in block 5. Next, in block 6, power is supplied to both the first and second electrodes 18 and 20 of the electrostatic attraction plate 6, and the paper attraction force in the electrostatic attraction area is set to F (normal attraction force). Next, the controller executes the drawing operation in block 7, and when the drawing of one drawing is completed, the controller turns off the power supply to the electrostatic suction plate 6 in block 8. Next, in decision block 9, it is determined whether or not to continue drawing, and if a negative determination is made, drawing is completed. If it is determined in decision block 4 that the paper on the electrostatic attraction plate 6 is a roll paper, then at block 16 F is set to a weak electrostatic attraction force, and at block 6, only the first electrode 18 is energized. Then, the suction area on the electrostatic suction plate 6 is set to the weak mode. When the drawing for one drawing is completed, the suction force is turned off, and it is determined at decision block 9 whether or not to continue drawing. An affirmative determination is made, and a determination is made in decision block 10 as to whether or not there is roll paper based on the output of sensor 16. If there is no roll paper, block 15 prepares new paper. If the determination in block 10 is affirmative, block 11 waits for a time (approximately 5 seconds) until the roll paper 14 separates from the suction surface of the electrostatic suction plate 6, and then in block 12, the roll paper winding device 12 is turned off. By driving, the roll paper 14 is transported for one drawing, and a new sheet surface for one drawing is developed on the electrostatic attraction area. Suction mode is block
In 13, it may be set manually from the keyboard of the controller. In this case, a plurality of modes can be set in addition to the normal mode and the weak mode. The mode can be selectively used according to the type of paper such as paper that is easily absorbed or paper that is difficult to be absorbed. In addition, the suction force can be switched in two or more stages, and can be selectively used according to the season. When the manual instruction of the suction mode is given in block 13, the controller next determines whether or not the suction force is in the normal mode in a decision block 14. If the judgment is affirmative, the controller shifts to block 5; Move to

〔effect〕

Since the present invention is configured as described above, the electrostatic attraction force can be varied by detecting the type of cut paper or roll paper on the controller side of the automatic drafting machine. There is an effect that the time required to separate from the electrostatic attraction surface can be shortened.

[Brief description of the drawings]

FIG. 1 is a flowchart, FIG. 2 is an external view of an automatic drafting machine, and FIG. 3 is an explanatory diagram. 2 ... machine body, 4 ... table, 6 ... electrostatic attraction plate, 8 ...
... Drawing head, 10 ... Roll paper supply device, 12 ... Roll paper take-up device, 14 ... Roll paper, 16 ... Paper type detection sensor, 18,20 ... Electrode.

Claims (1)

(57) [Claims] 1. An automatic drafting machine for developing roll paper or cut paper on an electrostatic attraction plate, fixing these sheets to the electrostatic attraction plate by the attraction force of the electrostatic attraction plate, and drawing on the paper. Detecting whether the paper on the electrostatic attraction plate is roll paper or cut paper, and increases the attraction force of the electrostatic attraction plate when using cut paper, and weakens at the time of continuous image formation with roll paper. A method for controlling electrostatic attraction force, characterized in that: