JPS62126048A - Both-sides duplicating machine - Google Patents

Abstract

PURPOSE:To bring sideways filing margines of copying sheets finished with one-sided copying to a same side when completing both-sides copying by adjusting the position of an intermediate tray for storing the copying sheets finished with one-sided copying in the direction perpendicular to the travel of the sheets before copying on the other sides. CONSTITUTION:When a shift data button is pushed, electrostatic photography process is started against a first sheet of one-sided copy originals and at the same time a motor 18b makes side guides 18a shift by a width (d) obtained with the data button. Namely both of the guides 18a move respectively to positions of +d and -d of the paper size. Then copying sheet, shaft being finished with the photography process, fixed with a copied image of the first sheet of copy originals, is sent with a guide roller 15, reversed with a reversing roller 17, and freely falls into an intermediate tray 18. Here, while the center G of the tray 18 and the center H of the sheets finished with copying are part by the width (d), the sheets are adjusted to a correct position with the guide 18a and stored into the tray 18, with their front edges aligned with stoppers 18e. When the number of the copied sheets counted with a sensor 19 coincides with that preset with a copy number setting button, copying on the first sheet is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a double-sided copying machine that adjusts the position of a copied image (hereinafter referred to as "image shift") in a direction perpendicular to the traveling direction of a copy sheet.

(Prior Art) In recent years, copying machines that can copy on both sides of a copy sheet have been on the market. When copying an original on the front and back sides of a single copy sheet (hereinafter referred to as "duplex copying"), the binding margins do not correspond on the front and back sides.In order to align the binding margins on the same side of the copy sheet, For example, the feeding timing of the copy sheet may be adjusted so that the copy image on the front side is shifted to the left by an amount d corresponding to the binding margin. Conventionally, a method for performing such an image shift has been proposed (Japanese Patent Laid-Open No. 53 -110830).

However, this conventional image shift method
This relates to the case of double-sided copying of a single-sided original that has a binding margin in the direction perpendicular to the traveling direction of the copy sheet, as shown in Figure 4 (a). The binding margin (hereinafter referred to as "
When duplexing a single-sided original having a horizontal binding margin (referred to as "horizontal stitching margin"), this method cannot be used because the image shift direction is different.

In other words, when making double-sided copies of a single-sided original with a side binding margin, if you simply flip the original and copy the back side, the image shown in Figure 4 (b) will appear.
As shown in the figure, the top and bottom of the front and back will not match, so after copying the front side, it must be rotated 180 degrees and reversed.
If this happens, the binding margins on the front and back sides will not be aligned on the same side as shown in FIG. 4(c), which is very inconvenient for organizing documents. In this case, in order to align the binding margins on the front and back sides on the same side, for example, the copy image on the back side can be shifted downward by an amount d equivalent to the binding margin, but the conventional image shifting method is This method cannot be applied in this case because the image shift is performed in parallel directions.

In addition, as a method for adjusting the binding margin during double-sided copying, a method has been proposed in which the area to be copied on the document is changed by shifting the position of the lens of the document scanning optical system, instead of using image shift. 59-28907), but according to this, the mechanism becomes complicated and precise because the position of the lens is moved.

(Object and Structure of the Invention) The present invention has been made in view of the above points, and an object of the present invention is to align the binding margins on the same side when duplexing a single-sided original having horizontal binding margins. To achieve this, in a double-sided copying machine, an intermediate tray that temporarily stores a copy sheet that has been copied on one side is moved in a direction perpendicular to the traveling direction of the copy sheet to perform image shifting before copying on the other side. It was configured as follows.

(Example) The present invention will be explained below based on the drawings.

FIG. 1 is a schematic diagram of an embodiment of a double-sided copying machine according to the present invention.

First, let me explain in advance about double-sided copying without image shift. 1. When you set the number of copies using the copy number setting button (not shown) and press the copy button (not shown), the first sheet of the single-sided original M on the document table L is activated by the illumination lamp 2. The reflected light from the exposed document M is moved to movable mirrors 3.4. It is guided onto the photoreceptor 7 on the drum 7 by the lens 5 and fixed mirror 6, and an electrostatic latent image is formed there. The electrostatic latent image is developed by a developing device 8, transferred by a transfer device 9 onto a copy sheet P fed from a paper feed cassette 10, and fixed by a fixing device 12 via a conveyor belt 11. Slightly prior to this, the switching mechanism 13 is switched in the direction of the solid line arrow around point E by a switching means (not shown) using a solenoid or the like, so that the copy paper that has been fixed and has been copied on one side passes through the reversing path. Guide roller 13a
is guided to the guide plate 14, and further guided to the guide roller 15.
and placed on the reversing bell) 16. The copy paper conveyed by the reversing belt 16 is temporarily stored in the intermediate tray 18 after being reversed. The first copy of a similar one-sided original is made on the number of copy sheets set by a copy number setting button (not shown), and all of the copies are stored in the intermediate tray 18. The single-sided copy paper stored in the intermediate tray 18 is detected by the intermediate tray sensor 19 immediately before being stored.
Detected by When the count value of the output signal from the intermediate tray sensor 19 matches the number of copies set by a copy number setting button (not shown), copying of the first one-sided original is completed.

Next, when the second single-sided original is set on the original table l and the copy button is pressed, a series of electrophotographic processing is performed on the second single-sided original. That is, the original is exposed to light by the optical scanning system, and an electrostatic latent image is formed on the photoreceptor 7a.
The image is developed by the developing device 8.

On the other hand, copy sheets with single-sided copies stored in the intermediate tray 18 are fed from the top by a paper feed roller 20 in synchronization with the timing of the electrophotographic process, and are fed by a paper feed belt 21. The single-sided copy paper is conveyed by a guide roller 22 along a guide plate 23 to a transfer position, where the visible image of the second single-sided original formed on the rotating drum 7 is transferred.

In this way, the copy sheet on which both sides have been copied is conveyed to a fixing position by a conveyor bell (11), where it is fixed by a fixing device 12. At this time, since the switching plate 13c of the switching mechanism 13 is switched in the direction of the broken line arrow, the guide roller 1
The copy sheet conveyed by 3a and 13b passes through the discharge path a and is discharged from the paper discharge port of the copying machine main body, and then is delivered to the paper discharge tray 2.
It is stored in 4. At this time, the discharge sensor 25 detects the discharge of the copy sheet. When the count value of the output signal from the paper ejection sensor 25 matches the number of copies set by a copy number setting button (not shown), copying of the second one-sided original is completed, and the same operation is repeated thereafter.

Next, a case in which image shifting is performed will be explained.

2(a) is an enlarged perspective view of the intermediate tray 18, and (b) is a bottom view of the intermediate tray 18. In FIG. The gear 18c and the rack 18d can each independently move the sheet in the direction of the arrow, and its position is automatically set according to the size of the copy sheet. 18e is a fulcrum that moves up and down in synchronization with the copying operation with point F (see FIG. 1) as a fulcrum for aligning the leading edges of the copy sheets stored in the intermediate tray 18; 18f is a bottom plate;
18g is a home position sensor consisting of a micro switch provided at the base position of the side guide 18a;
h is a guide slot.

First, press the image shift button (not shown) to perform the image shift, and then press the shift data button (not shown), which consists of a numeric keypad, etc., to input the shift width (length) of the position of the copied image. Then, a series of electrophotographic processing for the first single-sided original starts, but at the same time, the motor 18b rotates and the shift data button (not shown) is pressed.
The side guide 18a is moved by the deviation width (length) input by
moves. That is, the two side guides 18a move to predetermined positions according to the paper size of the copy sheet, but if the shift width (length) input using the shift data button (not shown) is, for example, as shown in FIG. ), the side guide 18a is paper size + d, paper size -
Each moves by d.

Next, after a series of electrophotographic processes, the copy sheet on which the copy image of the first sheet of the single-sided original has been fixed by the fixing device 12 is sent by a guide roller 15, a reversing belt 16, and a reversing roller 17.
The tray 18 is then reversed and freely falls at the position shown by A in FIG. 2(a). At this time, as shown in FIG. 3(a), the center G of the intermediate tray 18 and the center H of the copied copy sheet are shifted by a width d input using a shift button (not shown).
However, the copy sheet is misaligned by the side guide 18. The position is corrected by a, as shown in B and C shown in FIGS. 3(b) and 3(c), and the paper is stored in the intermediate tray 18, and its leading edge is aligned by the stopper/par 18e. As a result, the copy sheet is shifted by d in the direction perpendicular to the direction of travel and is placed on the intermediate tray 1.
When the count value of the output signal from the intermediate tray sensor 19 matches the number of copies set by a copy number setting button (not shown), copying of the first one-sided original is completed.

Next, when you set the second single-sided original on the first document table 1 and press the copy button, the copying machine operates in the same way as when the image shift described above is not performed, and copies the second single-sided original. When the count value of the output signal from the paper discharge sensor 25 matches the number of copies set by the copy number setting button (not shown), the copying of the second single-sided original is completed, and the side guide 18a is activated by the home position sensor 18g. Return to position.

Thereafter, the third and subsequent one-sided originals are copied in the same manner.

In the above embodiment, the side guide 18 of the intermediate tray 18
Although the left and right side guides 18a are moved independently before storing the single-sided copy sheet, the present invention is not limited to this. After storing the sheet in the intermediate tray 18, move it together with the copy sheet before refeeding the sheet; (2)
The bottom plate 18f is moved before storing the single-sided copied sheet. Or (3) the bottom plate 18f may be moved after storing the single-sided copied sheet and before refeeding the paper. In this case, in (2) and (3) above, the bottom plate 18f has only one motor. It can be moved using

Further, in the above embodiment, a double-sided copying machine is described in which an operator replaces originals one by one. However, the present invention is not limited to this, and the present invention is not limited to this. Needless to say, the present invention can also be applied to a double-sided copying machine equipped with an automatic document feeder.

(Effects of the Invention) As explained above, in the present invention, in a double-sided copying machine, the intermediate tray for temporarily storing a copy sheet that has been copied on one side is moved in advance of the copy sheet before copying on the other side. Since the image shift is performed by moving perpendicular to the direction, when duplexing a single-sided original with a horizontal binding margin, the binding margin can be aligned on the same side without moving the original. This effect can be obtained.

Further, by using the present invention, it is possible to easily adjust the center of the intermediate tray to match the center of the copy sheet feeding path of the copying machine. That is, conventionally, this type of adjustment was performed by shaking the bottom plate of the intermediate tray left and right, fixing it with four screws, and feeding the copy sheet each time, which was very troublesome, but the present invention By using , center adjustment can be easily performed by inputting shift data without having to perform troublesome work using a screwdriver or the like.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an embodiment of a double-sided copying machine according to the present invention, FIGS. 2(a) and 2(b) are enlarged views of the intermediate tray in the double-sided copying machine of FIG. ),(B),
(C) is a diagram showing step-by-step how copy sheets are stored in the intermediate tray of FIG. 2, and FIG. 4 is a diagram showing the correspondence between original documents and copied images. 17... Reversing roller, 18... Intermediate tray, 18a
...Side guide, 18b...Motor, 18c...Gear. 18d...Rack, 18e...Stopper, 18f
...Bottom plate, 18g...Home position sensor patent applicant Patent attorney, Roku Konishi Photo Industry Co., Ltd.
Hiroshi Suzuki Figure 2 (A) (O
) Figure 3 (A) (0) (C) Figure 4

Claims (1)

[Claims] In a double-sided copying machine that forms copied images on both sides of a copy sheet, an intermediate tray that temporarily stores a copy sheet that has been copied on one side is moved in a direction perpendicular to the traveling direction of the copy sheet before copying on the other side. A double-sided copying machine that is characterized by image shifting.