JPH0436281Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial field of application] This invention uses an electrostatic printer/plotter to draw and
The present invention relates to a paper meandering correction mechanism of a paper feeding unit in a paper cutting device that automatically cuts the output paper.

[Conventional technology]

Conventionally, the method of cutting the continuous paper drawn and printed by an electrostatic printer/plotter is to cut it manually or by using a special paper cutting device installed separately from the electrostatic printer/plotter, in accordance with JIS standards, etc. Generally, the cutting process is carried out to the drawing dimensions specified in .

Conventionally, electrostatic printers/plotters are equipped with paper cutting devices to automatically cut paper. In this paper cutting device, which automatically cuts the paper continuously drawn and printed by an electrostatic printer/plotter into standard drawing dimensions, the paper feed section is equipped with a paper feed section for carrying out the electrostatic printer/plotter. Either a paper feed roller synchronized with the paper feed roller is used, or if the paper is not synchronized, the paper is not delivered uniformly from the electrostatic printer/plotter, so the paper is fed with a slack in front of the paper feed roller.

[Problem that the invention attempts to solve]

However, in the case of synchronization, the circumferences of the delivery roller and the paper feed roller must be precisely the same, and if the parallelism is not made precise, the rollers will meander, which is mechanically extremely troublesome.

Also, when creating slack, the paper used in electrostatic printers and plotters is often used as the original drawing, and in order to improve copyability, the paper thickness is several tens of microns (approx. 70 micron) thin paper is used, and the paper width is JIS A0,
When the paper is as wide as A1, it is affected by even the slightest external force, which can cause the paper to meander.

Therefore, even if a paper cutting device for an electrostatic printer/plotter uses a paper feed roller that is synchronized with the paper ejection roller of the electrostatic printer/plotter in the paper feed section, it is difficult to remove slack before the paper feed roller. Even if you make one, the result will be a cut like the one shown in Figure 3. In other words, the locus 5' of paper cutting by the slitter is oblique to the ideal line 4, and the paper 2 is not cut parallel to the roll direction.

In order to improve this point, the present invention provides a paper cutting device that automatically cuts paper that is continuously drawn and printed using an electrostatic printer/plotter.
It is an object of the present invention to provide a paper meandering correction mechanism that allows a paper cutting device to feed paper in a stable state.

[Means and actions for solving problems]

In order to achieve the above object, the present invention provides a means for correcting paper meandering in the paper feeding portion of a paper cutting device, which includes a paper feed roller that feeds the paper, and a paper pool in front of the paper feed roller. A pair of light emitting diodes and a photo sensor are provided to detect the state of sagging, and a timer is also provided to determine the end of paper feeding to correct paper meandering in the paper feeding section. The purpose of this is that in order to maintain drawing accuracy, the ejection rollers of electrostatic printers and plotters are made with good parallelism to prevent paper meandering, and to prevent paper meandering that occurs when cutting slack areas. When the slack part is gone, the conveyance roller applies back tension to the paper to correct the meandering.

To explain this technical means along with its operation using FIGS. 1 and 2 corresponding to the embodiment, the paper meandering correction mechanism of the paper feed section according to the present invention
When the paper 2 is fed by the rollers 35a and 35b, a sag 2a of the paper is made in the pool box 34 in front of the paper feed rollers 35a and 35b, and then the paper is fed. The rotational speeds of the paper feed rollers 35a and 35b are set earlier than the rotational speed of the paper 2 delivery rollers 11a and 11b of the electrostatic printer/plotter. In this way, by setting the paper feed speed of the paper cutter 3 faster than the paper 2 delivery speed of the electrostatic printer/plotter, the paper sag 2a is stretched once. At this time, the photosensor 32 is turned on, and the paper feed rollers 35a and 35b for the paper 2 are stopped after a predetermined set time (correction time) has passed by a timer (not shown). This operation is repeated to correct the meandering of the paper 2. Thus, the cutting locus 5 of the paper 2 by the slitting cutter 38
As shown in FIG. 2, the meandering is constantly corrected and the meandering can be suppressed to a few micrometers.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. Figure 1 shows a paper cutting device that implements the paper meandering correction mechanism of the paper feed section according to the present invention.
It is a diagram showing a state where the printer is installed in a plotter. In the figure, 33 is a paper receiving plate for paper 2, and 36 is a paper receiving plate for paper 2.
A fixed blade 3 cuts perpendicular to the feeding direction of the paper 2 using a photo sensor that reads the cutting command mark recorded on the paper.
7a, a rotary cutter made up of a rotary blade 37b, and a cutting command is issued to a slitter 38 made up of a rotary cutter that cuts the paper 2 in parallel to the feeding direction.

In the present invention, as shown in the figure, the paper 2
A pool box 34 is installed to store the water with a little slack. Paper 2 ejected from the ejection rollers 11a and 11b of the electrostatic printer/plotter 1
The pool box 34 provided in front of the paper feed rollers 35a, 35b of the paper cutting device 3
, and the light from the light emitting diode 31 is blocked by the photo sensor 32 due to the sag 2a of the paper 2, so the time it takes for the paper 2 to be stretched without slack between the delivery rollers 11a, 11b and the paper feed rollers 35a, 35b. (not shown)
starts operating, and the timer causes the paper feed roller 3 to
Paper feeding operations 5a and 35b begin. Then, when the timer finishes its operation, the paper feed rollers 35a, 3
5b is completed, and the unloading rollers 11a, 11b
Since the paper feed rollers 35a, 35b rotate faster, the paper 2 is stretched between the delivery rollers 11a, 11b and the paper feed rollers 35a, 11b to correct meandering.

[Effect of idea]

As described above, according to the present invention, there is no need to synchronize the ejection roller of the electrostatic printer/plotter with the paper feed roller of the paper cutting device, and even if slack is created, the resulting meandering can be eliminated by the electrostatic printer/plotter. This invention can be corrected by once stretching the paper between the delivery roller of the paper cutter and the feed roller of the paper cutting device, and this mechanism continuously corrects the meandering as shown in FIG. 2, so the present invention is very effective.

[Brief explanation of the drawing]

Fig. 1 is a partial cross-sectional view showing a state in which a paper cutting device implementing the meandering correction mechanism of the paper feed section of the present invention is installed in an electrostatic printer/plotter, and Fig. 2 is a cut by the meandering correction of Fig. 1. FIG. 3 is a diagram showing a cutting trajectory and an ideal cutting line by a slitting cutter when the conventional meandering correction mechanism is not applied. 1... Electrostatic printer/plotter, 11a, 11
b... Carrying out roller, 2... Paper, 3... Paper cutting device, 31... Light emitting diode, 32... Photo sensor, 34... Pool box, 35a, 35b...
...Paper feed roller, 38...Slitting cutter, 4...
Ideal cutting line, 5, 5'...cutting locus.

Claims (1)

[Scope of utility model registration request] In a paper cutting device that automatically cuts paper continuously drawn and printed by an electrostatic printer/plotter using roll paper into standard drawing dimensions, the cutting section cuts the paper sent out from the delivery roller. a pair of light emitting diodes and a photosensor for detecting the slack state of the paper stored in front of the paper feed roller; and a timer that starts operating when the slack is detected by a diode and a photo sensor, and continues to operate until the paper feed roller is rotated at a higher speed than the carry-out roller until the slack part is removed and the paper is stretched for a certain period of time, 1. A paper meandering correction mechanism in a paper feed section, characterized in that the paper meandering correction mechanism is configured to correct paper meandering that occurs when the paper is conveyed to a cutting processing section.