JPS6214659A - Automatic both side copying machine - Google Patents

Abstract

PURPOSE:To forming a binding margin even for a lateral writing original and to putting paper in order simultaneously by making an image shift at right angles to the moving direction of a form. CONSTITUTION:Copying paper 20 after having a copy taken only on its one side is supplied from an inversion part 1 and turned over by a discharge roller 2, and the paper is put in respective states A, B, and C as shown in a figure and then falls by gravitation until it is stopped by a stopper 4. At this time, a side guide 5 (front side) is set at a paper size position and a side guide 5a (inner side) is set at a position (paper size + delta). When the copy paper 20 is stacked on a bottom plate 3 completely, only the side guide 5b is moved inward ly by delta while the side guide 5a is fixed. This movement delta corresponds to the quantity of the image shift and forms a binding margin in a reverse-surface copy.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an automatic double-sided copying machine, and more particularly to an automatic double-sided copying machine equipped with an intermediate stacker section for temporarily stacking sheets on which one-sided copying has been completed. be.

[Background of the invention]

In general, an automatic duplex copying machine includes an electrophotographic process that includes the steps of exposure, development, and constant transfer, an automatic document feeding mechanism, a paper reversing mechanism that reverses the front and back sides of the paper after single-sided copying, and A part of the intermediate stacker that temporarily stores paper, a paper feed/transport mechanism that transports the paper from the intermediate stacker and dents the back surface, a paper feeding mechanism that transports the copy paper that has been double-sided copied out of the main body, and a front It consists of a paper feeding device etc. that feeds paper to the transfer position at the time of copying.

When copying, an automatic document feed mechanism transports the document to a plantain, optically scans the document, exposes it to a photoreceptor, develops it with toner, and then feeds it from a paper feeder at the same time. One-sided copying is completed by transferring the transferred image to the paper using the transfer pole and fixing the transferred image by the fixing device.If only one-sided copying is required, the copy paper that has been fixed is sent to the output tray. It will be done.

On the other hand, in the case of double-sided copying, the copy sheets are reversed after fixing, and then sequentially stored in the intermediate stacker section. At a predetermined timing, they are taken out from a part of the intermediate stacker, copied on the back side, and then sent to the discharge tray.

In this double-sided copy mode, the important thing is to secure a binding margin, but in the past, there were only copying machines that were configured to be made only in the traveling direction of the paper.

Therefore, when copying the back side of an original that has been written horizontally relative to the paper's direction of travel, the binding margin cannot be created automatically, so the operator must shift the original onto the platen and create the necessary binding margin. Was.

In order to eliminate this inconvenience, an apparatus has been proposed in which a desired binding margin is obtained by placing the original at a regular position and shifting the stacking position of an intermediate stacker.

However, since such a device stacks sheets with the pair of side guide plates shifted by the amount of shift in advance, it has not yet achieved sufficient reliability.

In addition, when controlling the side guides, they remain fixed after they are first moved to the shift amount position specified by the paper size, so variations in the stopping accuracy of the side guides may cause the paper to be skewed or the paper surface to be distorted. There is a problem where this appears.

[Purpose of the invention]

The present invention has been made in view of the above, and an object of the present invention is to provide an automatic double-sided copying machine that can perform image shifting in a direction perpendicular to the direction in which paper travels.

[Structure of the invention]

In this invention, a pair of side guide plates provided on an intermediate stanker are each moved independently, so that an arbitrary shift amount can be obtained and alignment can be performed at the same time.

[Embodiments of the invention]

FIG. 1 shows an embodiment of the present invention, in which the back side of the copy paper introduced from the reversing unit 1 is placed at the downstream stage of the reversing unit 1 that guides the copy paper whose front side has been copied to the stacker. A discharge roller 2 for reversing the front side is provided.

A bottom plate 3 for accommodating the discharged copy paper is provided on the copy paper exit side of the discharge roller 2 in an inclined manner, and a stopper 4 is provided at the lower end of the bottom plate 3 to prevent the copy paper from falling.

Side guides 5a and 5b are installed in front of the bottom plate 3 and are movable in a direction perpendicular to the traveling direction in which the copy paper is discharged. It can be moved independently by motors 6a and 6b.

Each of the side guides 5a and 5b is equipped with a rack 7a and 7b at the bottom, and these racks mesh with pinions 8a and 8b driven by step motors 6a and 6b, and are rotated according to the rotation of step motors 6a and 6b. Ranks 7a and 7b move.

Furthermore, home position sensors 9a and 9b are provided outside each rack 7a and 7b to detect the home positions of the racks 7a and 7b.

Furthermore, a control unit 10 is provided that drives the step motors 6a and 6b based on the shift amount setting value and each output of the home position sensors 9a and 9b.

In the above configuration, as shown in FIG. 3, the copy paper 20 on which copies have been made only on the front side is fed from the reversing unit 1, and after being reversed by the ejection roller 2, the copy paper 20 is
-C, it naturally falls to the position where it is stopped by the stopper 4.

At this time, as shown in FIG. 4(a), the side guide 5
b (on the front side) is set at the paper size position, and the side guide 5a (on the back side) is set at the position of (paper size + δ).

When the copy paper 20 is completely stacked on the top surface of the bottom plate 3, only the side guide 5b is moved inward by δ as shown in FIG. 4(b), with the side guide 5a fixed.

This movement δ becomes the image shift amount, and becomes the binding amount in the back copy.

In addition, when the number of copies is two or more, all the copies are stacked on the top surface of the bottom plate 3 and then the side guide 5
Move b.

In this case, the shift amount δ can be specified (for example, 1 to 15n specified times in both directions) using the keyboard of the console (not shown), and the set value is input to the control unit IO. It has become.

The control section 10 executes the processing shown in FIG. 5 based on the manually input set values as well as the outputs from each sensor. That is, when the δ setting value is input and the double-sided copy mode is selected, the side guide 5a is set to the position of (paper size+δ), and the side guide 5b is set to the position of the paper size.

Next, when the start button is pressed, copying of the front side is executed sequentially, and the copy paper that has been fixed is stacked on the top surface of the bottom plate 3, and when all the sheets are stacked (this judgment is made according to the preset (The number of copies is subtracted and the judgment is made when it reaches O.) While the side guide 5a is kept fixed, the side guide 5b is moved from the state shown in FIG. 4(a) to the state shown in FIG. 4(b).

At this time, the shift amount is not set to δ but set to α wider than the paper size as shown in FIG. 6, so that the copy paper 20 and the side guides 5a and 5b do not come into pressure contact with each other.

This α is ±2 mm, which is set wide considering the variation in the width of B4 size paper (±2 mm according to the JIS standard).

After setting the side guide 5a, take out the copy paper one by one from the top of the copy paper stacked on the top surface of the bottom plate 3, and feed the copy paper to the transfer section of the evil light body while performing the image shift of δ. , transfer to the back side, and fix it to complete the double-sided copy. The copy sheets on which double-sided copying has been completed are sequentially delivered to the delivery tray.

When all the copy sheets stacked on the intermediate stuff car shown in FIG. Returning the guides 5a and 5b to the home position (determined by detecting the movement of the racks 7a and 7b to their initial positions using sensors 9a and 9b), and stopping the step motors 6a and 6b allows one double-sided copying to be performed. ends.

In the above explanation, it is assumed that the side guide is moved after all the copy sheets that have been single-sided copied are stacked, but the side guide may be moved back and forth every time one sheet is stacked. It is something.

〔Effect of the invention〕

By configuring this invention as described above, it is possible to shift the image in a direction perpendicular to the direction of paper travel.
This method has excellent effects such as being able to create a binding margin even for horizontally written originals, and also allowing alignment to be performed at the same time.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an embodiment of the present invention, FIG. 2 is an explanatory diagram showing the control system of the embodiment of FIG. 1, FIG. 3 is an explanatory diagram showing the flow of printing to the stacker, and FIG. Figure 4 (a),
(b) is an explanatory diagram of image shift, FIG. 5 is a flow diagram showing an example of processing, and FIG. 6 is an explanation showing movement of the side guide. l... Reversing section 2... Ejection roller 3... Bottom plate 4... Stoppers 5a, 5b... Side guides 6a', 6b. ...Step motors 7a, 7b.
... Rack 8a, 8b ... Binion 9a, 9b ... Home position sensor 10.
...Control part 2 Figure 3 (a) (b) Figure 5

Claims (1)

[Claims] After one side of the copy paper has been copied, the copy paper is turned over and stacked on the intermediate stacker section, and a pair of side guides provided in the intermediate stacker section performs an image shift, and then the stacked copy paper is taken out and the back side is stacked. In an automatic duplex copying machine that performs copying, one of the side guides is fixed at a position moved from the paper size position by the amount of image shift, and the other side guide is moved from the paper size position to the image guide after stacking of copy paper is completed. An automatic double-sided copying machine characterized by moving the portion to the copy paper side.