JPH0221582B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image shifting device for a copying machine for copying a document while shifting an image by a predetermined amount.

[Technical background of the invention]

Copied sheets are often punched and filed or bound into a book. In such a case, it is necessary that the image necessary for the so-called binding margin is not copied. Conventionally, as shown in FIG.
Copying is being performed with the . As shown in FIG. 2, a blank space 14 is provided at the binding margin of the copy sheet 13. However, this method requires an operator to shift the document on the platen. For this reason, the shift amount may not match for each document, and in extreme cases, a necessary image may be missing and the copying operation must be repeated. Furthermore, when copying is performed automatically using a device that automatically feeds originals, there is a problem in that such a binding margin cannot be set.

[Purpose of the invention]

In view of the above circumstances, an object of the present invention is to provide an image shifting device for a copying machine that can shift an image of a document by a predetermined amount without shifting the document on a platen. .

[Means to achieve the purpose]

In the present invention, an image shift mode is set in which the image of the document is shifted relative to the paper to be copied by operating a combination of keys or switches used in normal copying operations simultaneously or in a predetermined order. means, a key or switch for inputting setting data regarding the image shift amount in the state set to this mode, a non-volatile memory for storing this setting data, and a copying device in the area on the photoconductor where the image is formed. An opening/closing member, such as a gate, which is placed in the middle of the conveyance path that conveys the paper and restarts the conveyance after temporarily stopping the conveyance while the paper is in a loop, and a nonvolatile memory that controls this opening/closing member. The transfer position of this paper is adjusted in accordance with the image shift amount by changing the timing at which the copy paper after passing through the copy paper reaches the photoreceptor. The above object is achieved by providing an image shift device of a copying machine with a transfer position adjusting means.

The present invention will be explained in detail with reference to Examples below.

〔Example〕

FIG. 3 shows the appearance of a copying machine equipped with the image shift device of this embodiment. A power switch 16 is located on the front of the main body of this copying machine, and an operation panel 18 is located near the platen cover 17 on the top surface.
are placed respectively. The copy sheets 21 stacked on the paper feed tray 19 are discharged onto the discharge tray 22 after the toner images are transferred and fixed within the main body.

FIG. 4 shows a part of the operation panel. This part of the operation panel 18 has a numeric keypad 2.
4, print start key 25, power saving key 26,
An all clear key 27 and a display 28 are arranged.

FIG. 5 schematically shows the image shift device in this copying machine. With this device,
Using the various keys or switches (hereinafter simply referred to as keys) described above, the copying machine is set to the image shift mode. Each of the various keys used for mode setting has its own purpose. For example, when the power switch 16 is pressed, the AND circuit 3
1, an H (high) level power-on signal 33 is supplied to the copying machine control circuit 32, and the power is turned on. Also, if you press the print start key 25,
An H level print start signal 35 is supplied to the copying machine control circuit 32 via another AND circuit 34, and the copying operation is started. When the power saving key 26 is further pressed, an H level power saving signal 37 is supplied to the copying machine control circuit 32 via another AND circuit 36, thereby reducing power consumption in the copying machine's standby state. The numeric keypad 24 and all clear key 27 are also used in the copying machine control circuit 3 in normal copying mode.
It is used to instruct the second control operation.

Now, in order to set the copying machine to the image shift mode, the operator presses the power switch 16 while holding down both the print start key 25 and the power save key 26. This allows these keys 16, 2
An H level signal is output from an AND circuit 38 which takes the logical product of the outputs of 5 and 26, and a flip-flop circuit 39 is set. At the same time, the signal appearing at the output terminal changes to L (low) level,
The output of each AND circuit 31, 34, 36 is prohibited. That is, the normal copying mode is canceled and the copying machine shifts to the image shift mode.

When the flip-flop circuit 39 is set,
The image shift mode display drive circuit 41 is enabled by the H level signal appearing at the output terminal Q, and the image shift mode display drive circuit 41 is enabled.
2 is output. The display 28 receives this signal 42 and displays the characters "dI" in its left half area, as shown in FIG. This indicates that the image shift mode is set.

In this state, the operator operates the numeric keypad 24 to input the image shift amount in millimeters.
The input setting data is written to the nonvolatile memory 44 via the AND circuit 43. The written image shift amount is supplied to the display 28 as a shift amount display signal 45 and displayed on the right half thereof. The display 28 in FIG. 4 indicates that the image shift amount is 25 mm.

The shift amount display signal 45 is also supplied to an arithmetic circuit 46. The arithmetic circuit 46 operates on the copy paper 21 (the third
The time t for determining the transport timing shown in FIG.
Gate control circuit 48, as described in detail next.
sets the conveyance timing of the copy paper at the calculated time t, and shifts the image.

FIG. 6 is for explaining the shift of the image. In this copying machine, which copies a document 51 while it is stationary, an optical system consisting of a light source 52, mirrors 53 and 54, and a lens 55 moves back and forth.
An electrostatic latent image is formed on the photoreceptor 56. If the leading edge of the copy paper 21 arrives at the transfer position T at the timing when the leading edge of the toner image formed on the photoreceptor 56 through the development process arrives at the transfer position T, the image shift amount becomes zero. In normal copy mode, copying is performed in this manner.

By the way, the copy paper 21 is sent out from the paper feed tray 19 by the feed roller 57. Copy paper 2
1 is conveyed along a predetermined path by a pair of conveyance rollers 58 and 59, and when its tip hits the gate 61, the conveyance is stopped in a slightly looped state. The gate 61 is moved up and down by a gate drive mechanism 62 consisting of a solenoid or the like. The gate control circuit 48 measures time from the start of scanning of the original 51, and starts the gate drive mechanism 62 when the time t elapses.
is controlled, and the gate 61 is evacuated from the conveyance path.
At this timing, the leading edge of the copy paper 21 pushes forward due to the reaction force of the loop formed when it hits the gate 61 when stopped, and is moved to the transfer position T by the other pair of transport rollers 63 and 64, which are already in a rotating state. transported to. That is, in this device, the amount of image shift is adjusted by appropriately setting the time t.

Once the image shift amount is set, the nonvolatile memory 44 retains this setting even if the copying machine is powered off. That is, even if the power is temporarily turned off to save power or the like, the image of the document will be shifted by a predetermined amount the next time the copy is made.

This apparatus shown in FIG. 5 can manually cancel the image shift operation described above and perform a normal copying operation. When the operator presses the all clear key 27, the OR circuit 66 outputs a reset signal 67, thereby clearing the contents of the nonvolatile memory 44. Additionally, the flip-flop circuit 39 is reset, allowing normal key input.

The image shift device of the copying machine of this embodiment includes an auto clear circuit 67. This auto clear circuit 67 is a circuit for automatically canceling the image shift operation, and is provided in the apparatus as necessary. The auto clear circuit 67 performs the same operation as when the all clear key 27 is pressed. The auto clear circuit 67 starts timing operation from the time when the main motor (not shown) of the copying machine stops, and returns to the initial state when the main motor starts operating again. If the clocking time of the auto clear circuit 67 is set to, for example, 5 minutes, the clocking end signal 68 will be output when 5 minutes have passed after the copying operation is completed and the main motor is stopped. The output side of the AND circuit 69 thereby changes to H level, and the OR circuit 66 outputs a reset signal 67. By automatically canceling the image shift operation in this manner, a person who will make a copy later can make a normal copy.

In the embodiments described above, the case where the image is shifted in one direction has been described. For example, when making double-sided copies, it is necessary to shift the image in opposite directions on one side and on the other side. In such a case, data regarding the shift direction may also be input by key operation so that the shift amount can be adjusted in both directions. Further, in the apparatus of the embodiment, as a result of the image being shifted, a portion of the toner image that is not transferred to the copy paper remains on the photoreceptor. In order to avoid placing this burden on the cleaning system, unnecessary portions of the latent image may be erased by light irradiation at the stage of forming the electrostatic latent image on the photoreceptor.

〔Effect of the invention〕

As described above, according to the present invention, since the opening/closing member placed in the middle of the conveyance path of copying paper is controlled based on the setting data stored in the non-volatile memory, the transfer position of this paper can be controlled. It can be freely adjusted according to the amount of image shift. In addition, the conveyance of the paper is temporarily stopped while the opening/closing member forms a loop, and the conveyance of the paper is started by the opening of the opening/closing member and the reaction force of the loop formed on the paper. Another effect is that the image shift amount can be accurately set without causing errors due to inertial force as would be the case when the rotation of the paper conveying roller is turned on and off. Furthermore, the present invention stores data related to the image shift amount in a nonvolatile memory, so data setting,
Operations such as changing and clearing can be easily performed, and the set data can be saved even when the power is turned off. Therefore, the image can be shifted and copied immediately after the power is turned on again. There is an effect that it can be done.

[Brief explanation of drawings]

Fig. 1 is a plan view for explaining the conventional image shift method, Fig. 2 is a plan view showing a copied sheet with the binding margin blank, and Figs. 3 is an external view of a copying machine equipped with an image shift device, FIG. 4 is a plan view showing a part of the operation panel of this copying machine, and FIG. 5 is for explaining one embodiment. 6 is a block diagram showing the main parts of the image shift device, and FIG. 6 is a schematic configuration diagram of the copying machine. 21... Copy paper, 24... Numeric keypad, 25... Print start key, 26... Power saving key, 27... All clear key, 39... Flip-flop circuit, 4
4...Nonvolatile memory, 48...Gate control circuit, 5
6...Photoreceptor, 61...Gate, 62...Gate drive mechanism.

Claims (1)

[Claims] 1. An image in which the image of the original is set to be shifted relative to the paper to be copied by operating a combination of keys or switches used in normal copying operations simultaneously or in a predetermined order. a shift mode setting means; a key or switch for inputting setting data regarding the image shift amount when set to this mode; a nonvolatile memory for storing this setting data; an opening/closing member disposed in the middle of a conveyance path for conveying copying paper, and restarting the conveyance after temporarily stopping the conveyance of the paper in a loop state; Control is performed based on setting data stored in a non-volatile memory, and the timing at which the copying paper passes through this reaches the photoconductor is changed, and the transfer position of this paper is adjusted according to the image shift amount. An image shift device for a copying machine, comprising: a transfer position adjusting means for adjusting the transfer position.