JPH0719112B2 - Copier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention, when the number of copies and the copy magnification are set by mistake,
The present invention relates to a copying machine having a release switch for releasing it.

<Prior art> In the conventional copying machine, when the number of copies is incorrectly set, copying operation is performed by pressing a copy setting release switch (clear key and automatic exposure control key, so-called AE key, etc.). There is something to stop.

<Problems to be Solved by the Invention> In the above copying machine, after the copying switch was pressed to start the copying operation, the user made a mistake in setting the number of copies, etc. When the release switch is pressed, if the timing is before the transfer paper is fed, copying is canceled, and if it is after the paper is fed, only the transfer paper is normally copied. The paper is ejected outside, and the copier returns to the standby state.

However, in this case, if a setting error is noticed after the paper feeding is started, at least one copy is made before the operation of the copying machine is stopped, so that the transfer paper and the toner are wasted. There is a point.

<Means for Solving the Problems> The means for solving the problems according to the present invention charges the photosensitive member 1 and the photosensitive surface of the photosensitive member 1 as shown in the flow chart of FIG. 1 and the block diagram of FIG. Charging means 2, a charge eliminating means 3 for eliminating charge on the photosensitive surface of the photoreceptor 1 before development, an optical system 11 for irradiating the photosensitive surface of the photoreceptor 1 with a light image of an original to expose it, and a copy setting. A release switch 4 and a sheet feeding means 6 for feeding the transfer paper 5 to the photoconductor 1 are provided, and a control device 7 for controlling the drive of the static eliminator 3 in response to a release signal from the release switch 4 is provided. In the copying machine, the control device 7 has a function of starting the feeding of the transfer paper by the paper feeding means 6 before the exposure position of the optical system 11 reaches the front end of the document, and the potential of the photosensitive surface of the photoconductor 1. The pre-rotation for uniformizing the When the release switch 4 is operated before the exposure position by the optical system 11 reaches the leading edge of the original after the charging, a discharging signal is output to the discharging unit 3 so that the entire charged photosensitive surface is discharged. Has the function of performing a normal copying process, and the optical system
After the exposure position by 11 has passed the leading edge of the original, the static elimination signal is output to the static elimination means 3 so as to perform the normal static elimination before development without receiving the release signal from the release switch 4 to execute the normal copying process. It has a function and.

<Operation> In the above problem solving means, when the pre-rotation for making the potential of the photosensitive surface of the photoconductor 1 uniform is completed, charging by the charging means 2 and normal charge removal by the charge removing means 3 (lighting on data), optical system The exposure and the like are sequentially performed by 11, and the original image is copied on the transfer paper 5 fed by the paper feeding means 6 according to the copy setting and is ejected outside the machine. At this time, when the user notices an error in the copy setting and operates the copy setting release switch 4 to output a release signal, the pre-rotation of the photoconductor 1 is completed and after the charging by the charging means 2, the optical system 11 is used. Until the exposure position reaches the leading edge of the original, even if the charge removing unit 3 removes the charge (all lights) on the entire photosensitive surface and develops it, toner does not adhere to the photosensitive surface. The transferred transfer paper 5 is discharged to the outside of the machine in a blank state.
As a result, it is possible to eliminate waste of toner and transfer paper due to an error in the user's copy settings.

Further, after the exposure position by the optical system 11 has passed the leading edge of the original, the static elimination means 3 does not receive the release signal and the normal static elimination before the development is performed to completely remove the transfer paper 5 fed by the normal copying process. The original image is copied on the paper and ejected out of the machine. As a result, when the number of copies is wrong and the error is noticed before the desired number of copies is made, the transfer paper 5 can be used without waste.

<Embodiment> An embodiment of the copying machine of the present invention will be described below with reference to FIGS. 1 and 3. FIG. 1 is a control flow chart of a copying machine showing an embodiment of the present invention, FIG. 2 is a control block diagram thereof, and FIG. 3 is a vertical side view thereof.

As shown in the figure, the copying machine of the present invention includes a photoconductor 1 for forming a visible image and a latent image, a charging unit 2 for charging the photoconductive surface of the photoconductor 1 to a predetermined polarity, and the photoconductor 1 Discharging means 3 for discharging the photosensitive surface of the sheet, and a copy setting cancel switch 4
And a paper feeding means 6 for feeding the transfer paper 5 to the photoconductor 1, and a control device 7 for controlling the drive of the charge eliminating means 3 in response to a release signal from the release switch 4 is provided. Reference numeral 7 is provided with a function of outputting a static elimination signal to the static elimination unit 3 in response to a release signal before and after driving the paper feeding unit 6.

A main charger 8 as a charging unit 2 for charging the outer periphery of the photoconductor 1 rotating in the clockwise direction, and a discharge lamp as a discharging unit 3 for removing the potential on the photosensitive surface charged by the main charger 8. 9, an exposure unit 12 that irradiates a predetermined document placed on the document table 10 with an optical image through an optical system 11,
A developing device 13 that supplies toner to the electrostatic latent image formed by the exposure unit 12 to visualize the electrostatic latent image is sequentially arranged in the clockwise direction.

Further, on the front wall of the copying machine main body A, there are provided a manual paper feed tray 14 for storing the transfer paper 5, two automatic paper feed cassettes 15 and 16, and a paper feed section 18 such as a large capacity cassette 17. There is.

Further, a corona discharge having the same polarity as the electrostatic latent image is made from the back surface of the transfer paper 5 sent from the paper feed table 14 or the like to the lower outer peripheral portion of the photoconductor 1 to transfer from the photosensitive surface of the photoconductor 1. A transfer separation unit 19 that also serves as a transfer charge for attracting toner to the paper 5 and a separation charge for performing corona discharge for separating the transfer paper 5 after the toner image transfer from the photosensitive surface, and the replenishment of the developing device 13. Photoconductor 1 at the position facing the paper
A cleaning device 20 for removing the toner remaining on the photosensitive surface after the transfer and a fanning lamp 21 for removing the residual potential on the surface of the photosensitive body after cleaning by light irradiation are sequentially arranged in the clockwise direction.

Further, a transfer paper transport device 23 is provided on the paper feed side of the photoconductor 1 for feeding the transfer paper 5 peeled from the photoconductor 1 to a fixing device 22 for forming a stable permanent image. 24 is a paper output tray.

The controller 7 is a general one-chip microcomputer, has a program ROM, data RAM, ALU, etc. inside and is driven by a reference clock oscillator.

As shown in FIG. 2, the control device 7 has the copy start switch 25 and the release switch 4 connected to the input side thereof, and the drive section of the static eliminator 3 connected to the output side thereof.

In the above structure, when the copy start switch 25 is pressed, the pre-rotation of the photoconductor 1 is started. Then, the transfer paper 5 is fed into the main body by a paper feed means 6 such as a roller, transferred to the transfer paper 5 in a predetermined order, and a predetermined set number X of copies are made to carry out the machine. Is issued to.

However, if the user notices an error in the copy setting such as the number of copies before the pre-rotation of the photoconductor 1 and presses the release switch 4 (AE key, scaling key, etc.) at n1 in FIG. Drive stops. This has been already done in the prior art, but the release switch 4 is not pressed by n1 and the photoconductor 1
When the pre-rotation is completed and the sheet feeding is started, in the conventional technique, the copying is normally performed, the fed transfer sheet 5 is ejected to the outside of the machine, and then the driving of the copying machine is stopped. However, in the present invention, it is determined at n2 whether the release switch 4 has been pressed before the exposure position of the optical system 11 reaches the leading edge of the original.
The detection by the optical system 11 when the exposure position comes to the leading edge of the document is a well-known technique, and is disclosed, for example, in JP-A-52-75332, page 3, lower left column, lines 3 to 5 and page 4, upper left. Column number 7
As disclosed in lines 10 to 10, the manuscript is placed on the manuscript table 10 so that its leading end is at a fixed position.
When the exposure position of the optical system 11 reaches the leading edge of the document, a cam or the like attached to a moving member (mirror or the like) of the optical system 11 operates a micro switch to generate a signal. Also, JP-A-61-59322, page 7, page 1,
As disclosed in lines 8 to 8, a rotary encoder is connected to a rotary shaft of a motor that drives the optical system 11, and a rotation speed of the motor, that is, a feed return of a moving member (mirror base or the like) of the optical system 11. A pulse train having a pulse period proportional to the speed is sent to the control device 7, and the control device 7 detects the moving speed of the moving member from the pulse period by receiving this pulse train, and moves the moving member from the pulse number. Detect the distance. Then, it may be detected by comparing the detected moving distance with the moving distance of the moving member when the preset exposure position of the optical system 11 reaches the leading edge of the document. If the release switch 4 is pushed before the exposure position reaches the leading edge of the document, the control device 7 turns on only the static eliminator 3 (blank lamp), and otherwise performs normal driving. As a result, the photosensitive surface of the photoconductor 1 is neutralized, and the static eliminator 3 is positioned in the clockwise direction of the charging unit 2, so that toner does not adhere to the photoconductor 1.
The photoconductor 1 is ejected out of the machine as a blank sheet.

Then, after the exposure position by the optical system 11 has passed the leading edge of the document, the neutralization means 3 does not receive the release switch 4 and turns on the normal data, and the transfer paper 5 fed in the normal copy mode is taken out of the machine. Then, the copy machine is stopped.

The present invention is not limited to the above embodiments, and it goes without saying that many modifications and changes can be made to the above embodiments within the scope of the present invention.

<Effects of the Invention> As is apparent from the above description, according to the present invention, after the user notices an error in the copy setting and the pre-rotation of the photoconductor is completed and the photoconductor is charged, the exposure position by the optical system becomes the leading edge of the document. If the copy setting release switch is operated and the release signal is output before the time comes, even if the paper feed is started, the entire photosensitive surface is neutralized and the transfer paper can be discharged as a blank paper. After the exposure position has passed the leading edge of the original, the static electricity can be removed before development so that the transfer paper can be ejected with the original image completely copied, and only part of the original image was copied. Transfer paper is not ejected in this state.

As a result, if the transfer paper is discharged in a blank state, it is possible to eliminate the waste of toner and transfer paper due to an error in the copy setting by the user. Also, if you make a mistake in the number of copies,
If an error is noticed before the desired number of sheets are copied, it can be used without waste even if the discharged transfer paper is not blank but the original image is completely copied.

[Brief description of drawings]

FIG. 1 is a control flow chart of a copying machine showing an embodiment of the present invention, FIG. 2 is a control block diagram thereof, and FIG. 3 is a vertical side view thereof. 1: photoconductor, 2: charging means, 3: charge removing means, 4: copy setting release switch, 5: transfer paper, 6: paper feeding means, 7: controller, 11: optical system.

Claims (1)

[Claims] 1. A photoconductor, a charging unit for charging the photoconductor surface of the photoconductor, a destaticizing unit for destaticizing the photoconductor surface of the photoconductor before development, and a light source for a document on the photoconductor surface of the photoconductor. An optical system for irradiating and exposing an image, a copy setting release switch, and a sheet feeding means for feeding the transfer sheet to the photoconductor are provided, and the drive of the static eliminator is controlled by a release signal from the release switch. In a copying machine provided with a control device, the control device has a function of starting the feeding of the transfer paper by the paper feeding means until the exposure position of the optical system reaches the leading edge of the document, and a photosensitive surface of the photoconductor. When the release switch is operated before the exposure position by the optical system reaches the leading edge of the original after the pre-rotation for uniformizing the potential of the end of charging by the charging means, the entire charged photosensitive surface is To eliminate the charge A function of outputting an electric signal and executing other normal copying processes, and after the exposure position by the optical system passes the leading edge of the original, the normal static elimination before development is performed without receiving the release signal from the release switch. A copying machine having a function of outputting a discharging signal to the discharging unit to execute a normal copying process.