JPS6230264A - Copying machine - Google Patents

Abstract

PURPOSE:To arrange the position of a transfer image on a copying sheet at the same side when a double original is transferred on a single face by deciding whether an original is front-transferred or back-transferred and shifting the position of the transfer image to be formed on the copying sheet while the prescribed one face is transferred. CONSTITUTION:When the original is judged to be a back, a CPU 25 reads shift data which is previously inputted through a shift data buttom 22 and stored in a RAM 26, and subtracts a time corresponding to the shift width from a paper feed timing t1 with respect to an original surface. If the transfer image on the back is shifted at a right side by (d), the paper feed timing is advanced by the time corresponding to (d). The paper feed timing is calculated from the stoppage of an original feed motor 28. After a time t2(t2<t1) available from subtracting the time corresponding to the shift data has passed, the CPU 25 outputs a signal to a drive circuit 29, and a copying sheet feed clutch 30 is driven, thereby supplying the copying sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a copying machine equipped with a document reversing type automatic document feeder that adjusts the position of a copied image (image shift) when making a single-sided copy of a double-sided document. .

(Prior Art) In recent years, copying machines that can copy on both sides of a copy sheet have been on the market. When copying a single-sided original onto the front and back sides of a single copy sheet (hereinafter referred to as ``double-sided copying''), the binding margins do not correspond on the front and back sides, so in order to align the binding margins on the same side of the copy sheet ′, For example, all you need to do is adjust the paper feed timing of the recording paper so that the copied image on the back side moves to the left by the amount d equivalent to the binding margin.
A method for performing image shift has been proposed (Japanese Patent Laid-Open No. 110830/1983).

On the other hand, copying machines have traditionally used a device called an automatic document feeder that automatically feeds originals onto the document table in succession, but recently these devices have also been used to further reverse the original. A document reversing type automatic document feeder has been devised.

With the spread of double-sided copying mentioned above, if we consider the case where a double-sided original (hereinafter referred to as a "double-sided original") is used in a copying machine that uses a document reversing automatic document feeder, When copying, there is no need to adjust the position of the copied image (image shift) (see Figure 5 (c)).
In some cases, a double-sided original is copied onto one side of two copy sheets, such as when copying onto a double-sided copy sheet (called "base paper"), or when you want to reserve the back side of the copy sheet for notes. In this case, if you copy as is, the position of the binding margin will be separated to the left and right between the first recording sheet and the second copy sheet, as shown in Figure 4 (D). In order to align the binding margin to the same side as the first sheet, it is necessary to move the copy image on the back side of the document to the right by an amount d corresponding to the binding margin, for example by adjusting the copy sheet feeding timing.

However, in the conventional copy image position adjustment method, the main purpose of the copy image position adjustment method is to adjust the copy image position when duplexing a single-sided original as shown in FIG. When copying a double-sided original onto one side of two copy sheets in an installed copying machine, there is a problem in that it cannot be applied to position adjustment of copied images to align the binding margins of both copy sheets to the same side.

(Objects and Structure of the Invention) The present invention has been made in view of the above points, and when a double-sided original is made a single-sided copy in a copying machine equipped with an automatic document reversing type automatic document feeder, the copied image on the copy sheet is The purpose is to align the positions on the same side, and in order to achieve this purpose, it is determined whether the original is being copied on the front side or the back side, and when a predetermined one side is being copied, The system is configured to shift the position of the copied image.

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

FIG. 1 is a schematic diagram of a copying machine according to the present invention, in which A, surrounded by broken lines, is a document reversing type automatic document feeding device, and B is a main body of the copying machine. Note that the example illustrated here is of a type that makes a single-sided copy of a double-sided original.

In the figure, multiple double-sided originals are set on one original placing plate with the front side facing up, and the uppermost original is placed on the feed roller 2.
The document is sent to a predetermined position on a glass document table 6 by the feed belt 3, feed roller 4, and conveyance belt 5, and the front surface of the document is copied. Thereafter, the document is conveyed by the conveyor belt 5 in the opposite direction to the direction in which it was fed, sent through the document reversing guide 7 in the direction of the arrow, reversed, and sent again to a predetermined position on the glass document table 6 by the conveyor belt 5, this time. The back side of the original is copied.

On the other hand, the structure of the copying machine main body B is well known, in which an original on a glass original table 6 is exposed and scanned by an illumination lamp 9, and the reflected light is guided by mirrors 10° and 11.12 onto a photoreceptor 13. After forming an electrostatic latent image on the sheet, developing it into a visible image using a developing device 14, and transferring this visible image using a transfer device 15 onto a copy sheet P fed from a sheet feeding device 20, , and is fixed by the fixing device 16 and discharged onto the paper discharge tray 18. Note that the discharge of the recording paper is detected by the discharge sensor 17.

Next, FIG. 2 is a block diagram showing an embodiment of a circuit configuration related to image position adjustment of a copying machine according to the present invention.

In the figure, reference numeral 17 indicates the paper ejection sensor previously explained in FIG. Shift data button to enter
23 is a double-sided selection button for selecting a double-sided original when the original to be copied is a double-sided original; 24 is a copy button for starting copying; 25 is a command for timing of feeding the original and electrophotographic processing according to a predetermined program. CPU, 2
Reference numeral 6 denotes a RAM-configured memory that stores the output from the paper discharge sensor 17 and the status of each input button. 27 is a drive circuit that drives the document feed motor 28;
8 is configured to drive a drive roller 5a (see FIG. 1) of the conveyor belt 5 via a clutch or gear.

Reference numeral 30 denotes a copy sheet feed clutch that operates the copy sheet feed roller 19 shown in FIG. 1, and is driven by a drive circuit 29.

Next, the operation of the copying apparatus according to the present invention will be explained using the flow chart of FIG. 3 and the time chart of FIG. 4.

Before starting copying, first select a double-sided document using the double-sided selection button 23 (F-1), and input the displacement width of the copied image using the shift data button 22. Next, press the copy button 24. The document feed motor 28 is driven (see FIG. 4(b)), and the document is sent out by the feed roller 2 and placed at a predetermined position on the glass document table 6 by the feed belt 3, feed roller 4, and conveyor belt 5. Once set, the document feeding motor 28 stops. Then, after a predetermined time t1 has elapsed according to a timer set in the CPU 25, the CPU 25 sends a signal to the drive circuit 29, drives the copy sheet feed clutch 30, supplies the copy sheet, and starts the electrophotographic process inside the copying machine. A visible image is then formed on the copy sheet, fixed, and ejected.

At this time, the paper discharge sensor 17 is turned on.

Since the desired number of copies set by the number of copies setting button 21 is stored in the RAM 26, the CPU 25 counts the output from the paper ejection sensor 17, and repeats the above-mentioned process until the count value matches the desired number of copies stored in the RAM 26. Repeat the electrophotographic process.

When the CPU 25 determines based on the output from the paper ejection sensor 17 that the set desired number of copies has been completed, it outputs a motor reversal signal to the drive circuit 27. As a result, the document feed motor 28 rotates in the reverse direction, and the document, which had been in the normal position, is conveyed by the conveyor belt 5 (moving in the direction of the dashed arrow) in the opposite direction to the direction in which it was fed, and guided to the reversing section. That is, the original is conveyed in the direction of the arrow in the original reversing guide 7 by reversing rollers 8a, 8b, and 8C. During this time, the rotation direction of the document feed motor 28 is switched, and the conveyor belt 5 is again moving in the direction of the solid arrow. The reversed document is then conveyed by the conveyor belt 5 and comes to rest again at a predetermined position on the glass document table 6, and the document feed motor 28 is stopped. At this time, the back side of the original is facing down.

Next, the electrophotographic process is started in the main body of the copying machine, but the CPU 25 determines in advance whether the document is on the back side (F-2). This determination is made as follows. That is, before copying, the desired number of copies is set using the copy number setting button 21, and the desired number of copies data is stored in the RAM.
26. And a paper ejection sensor 17 for each document.
The CPU 25 counts the signals output from the CPU 25, and if the counted number matches the desired number of sheets set, a match signal is output, and the CPU 25 continues counting the match signal.If the counted number of the match signal is an odd number, It is the front side, and if it is an even number, it is the back side.

Now, when it is determined that the document is on the back side, the CPU 25 inputs the shift data button 22 in advance and stores it in the RAM 2.
Read out the shift data stored in step 6 (F-3), and set the paper feed timing t to the surface of the original for a time corresponding to the shift width.
1 (see Figure 4 (l\)) (F-4), that is, as shown in Figure 5 (d), the copied image on the back side is
If you want to shift the document feeding motor 28 to the right by the same amount, the paper feeding time should be advanced by the time corresponding to d.As shown in FIG.
Time t2 (t2<t
1), a signal is sent from the CPU 25 to the drive circuit 29, and the copy sheet feed clutch 30 is driven to feed the copy sheet (F-5). The paper is then discharged through the paper discharge sensor 17. The same operation can be repeated for the second and subsequent documents.

In the above embodiment, the timing of feeding the copy sheet by the copy sheet feeding clutch 30 is adjusted as a means for adjusting the position of the copied image, but the timing is not limited to this, and the timing of starting the exposure scan of the optical system may be adjusted, or the mirror of the optical system may be adjusted. The formation position of the electrostatic latent image on the photoreceptor may be shifted by adjusting the position of the electrostatic latent image.

Further, in the above embodiment, the image shift is performed while copying the back side of the document, but the image shift is not limited thereto, and may be performed while copying the front side of the document.

(Effects of the Invention) As explained above, in the present invention, in a copying machine equipped with a document reversing type automatic document feeder, it is determined whether the front side or the back side of the document is being copied, and a predetermined one side is copied. Since the structure is configured to shift the position of the copy image formed on the copy sheet when the copy sheet is in the middle, when making a single-sided copy of a double-sided original, the position of the copy image on the copy sheet can be aligned on the same side. The binding margins can be aligned in one direction, making it possible to create copies that are easy to read and file.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of a copying machine according to the present invention, FIG. 2 is a block diagram showing an embodiment of a circuit configuration related to image position adjustment of a copying machine according to the present invention, and FIG. FIG. 4 is a flowchart explaining the image position adjustment operation of the copying machine according to the present invention; FIG. 4 is a time chart explaining the image position adjustment operation of the copying machine according to the present invention; FIGS.
C) and (D) are diagrams showing different positional relationships between the original and the copied image. l...Document placement plate, 2...Feeding roller, 5...
・Transport belt, 6...Glass document table, 7...Reversing guide Patent applicant: Konishi Roku Photo Industry Co., Ltd. Agent, Patent attorney: Hiroshi Suzuki (Man) Autopsy 1F (Throt, lol) (IF name 1) (Jihiro) (FJλ) ()E prong)

Claims (1)

[Claims] In a copying machine equipped with a document reversing type automatic document feeder having an image shifting means for forming images at different positions on a copy sheet, the image shifting means forms a front side image and a back side image of the document on different sheets. 1. A copying machine characterized in that the copying machine is configured to perform an image shift on the other side of the original when copying a predetermined one side of the original based on a signal indicating a double-sided original.