JPS6232473A - Electronic copying machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an electronic copying machine that exposes a photoreceptor to image light of an original by reciprocating a document table on which an original is placed.

Prior Art In an electronic copying machine that reciprocates a document table on which an original is placed to expose the image light of the original onto a photoreceptor, a paper feeding device that feeds the transfer paper It is known that the time required for the first copy, that is, the first copy time, is determined based on the case where the slip amount is maximum.

However, this electronic copying machine has a drawback that even when feeding a transfer paper with a small slip amount, the first copy time is the same as when the transfer paper has a maximum slip amount.

OBJECTS An object of the present invention is to provide an electronic copying machine that can shorten the first copy time when the slip amount of transfer paper is small.

Structure The present invention provides an electronic copying machine that exposes a photoreceptor to image light of the original by reciprocating a document table on which a complete document is placed, in which the document table is placed at a reference position and transfer paper is fed. It is characterized in that the image forming operation is started from the point at which the image forming apparatus reaches a position where there is almost no slipping.

Next, specific embodiments of the configuration of the present invention will be described in detail based on the drawings.

In the first factor, reference numeral 1 indicates the exterior plate of the electronic copying machine. A loop-shaped photoreceptor 2 is provided in the center of the exterior plate 1.
is arranged, and this photoreceptor 2 is mounted on three rollers 3. One of these rollers 3 is rotated by a driving means (not shown) to move the photoreceptor 2 in a predetermined direction. As shown in FIG. 2, the photoreceptor 2 has a loop shape by connecting one belt-shaped photoreceptor 2, and the connecting portion 2a is not used for image formation. Since the connecting portion 2ai of the photoreceptor 2 is not used for image formation, a photoreceptor position detection piece 4 made of a metal piece or the like necessary for obtaining a signal for determining the timing of image formation is fixed to the photoreceptor 2. ing. A photoconductor position sensor 5 consisting of a photosensor or the like for detecting the photoconductor position detection piece 4 is arranged near the photoconductor 2.

Around the photoreceptor 2, there are a charging device 6, an exposure device 7, a developing device 8, a transfer device 9, a paper feed device 10, a transfer paper conveying device 11, a fixing device 12, a paper ejection device 13, a cleaning device 14, and a static eliminator. A device 15 is arranged.

The corner imager N7 includes a transparent glass 7a disposed on the upper surface of the exterior plate 1, a document table 7b disposed on the exterior plate 1 so as to be movable in the horizontal direction, and a document placed on the document table 7b. 8) Y: for illuminating the printed original.

A lamp 7C, an imaging element array 7d that forms an image of image light from a document onto the photoreceptor 2, and the document table 7b? It may consist of a driving means (not shown) for moving in the direction of arrow a or the opposite direction." (2) Under the document table 7b, this is placed at a home position, which is a reference position for exposing the document. A document table home position sensor 16, which is composed of a microswitch or the like, is arranged to detect whether the document is in the original position.

The paper feed device 10 includes a paper feed cell (10a) disposed at the bottom of the exterior plate 1 and accommodating all of the transfer paper P, and a paper feed cell (10a) disposed on the front end of the paper feed cell (10a). A roller 10b, a flexible control member 10C that is in elastic pressure contact with the roller and completely prevents double feeding of the transferred paper P, and a pair of relay rollers 1 arranged in the paper feeding direction of the paper feeding roller 10b.
0d, a pair of 17 registration rollers 10e arranged in the paper feeding direction of these relay rollers 10d, auxiliary rollers 10f arranged between these middle i rollers 10d and registration rollers 10e, and transfer paper P. a guide plate 10g for guiding the paper, and a manual feed tray 10 for receiving manually fed transfer paper.
h, and the transfer paper full relay roller 10 inserted above it.
It consists of a sending roller 10i that sends out in the direction of d.

The transfer paper P sent out from the paper feed cassette 10a by the paper feed roller 10b is inserted between a pair of relay rollers 10d, is fed while being held between them, passes through an auxiliary roller 10fi, and passes through a pair of non-rotating rollers. It comes into contact with the contact portion of the registration roller 10e and stands by in a slightly bent state. A paper feed sensor 17 made of a photo sensor is arranged between the paper feed roller 10b and the relay port 10d, and a registration roller front paper made of a photo sensor is also arranged between the relay roller 10d and the registration roller 10e. A sensor 18 is provided. The paper feed sensor 17 detects when the transfer paper P fed by the paper feed roller 10b has reached a position where it hardly slips. When the leading end of the transfer paper P sent by the relay roller 10d is detected by the registration roller front sensor 18, the relay roller 10
The driving force to d is cut off, and the transfer paper P is held in a slightly bent state between the relay roller 10d and the registration roller 10e, and the skew is corrected.

Next, the registration roller 10e feeds the transfer paper P between the photoreceptor 2 and the transfer device 90 in synchronization with the toner image on the photoreceptor 2. When the transfer paper P is fed by these registration rollers 10C, the relay roller 10d is rotated at the same peripheral speed as the registration rollers 10e and synchronously.

The roller 3 on which the photoreceptor 2 is attached, and the document table 7
b. The paper feed roller 10b, the relay port roller 10d1, the auxiliary roller 10f, and the registration roller 10C are driven by the rotational force of a motor (not shown) transmitted through a chain, gear, clutch, or the like.

An operation display panel 19 is provided on the upper surface of the exterior plate 1, which will be explained next based on FIG. 3.

The operation display panel 19 has a power supply iON or OF.
F power key 20. Power indicator 21 to display power ON or OFF, start key 22 to start copying, number of copies to set? Numeric keypad 23 for input
, a clear stop key 24 that clears the input value using the numeric keypad 23 and stops copying, a copy set sheet number display 25 that displays the total number of copies set, a copy execution sheet number display 26 that displays the number of sheets to be copied, and a copy paper P A jam indicator 27 for indicating that a jam has occurred, and a document tray abnormality indicator 28 for indicating that an abnormality has occurred in the drive of the document tray 7b are provided.

The fourth factor is a control device for an electronic copying machine according to the present invention, which will be explained next.

The above-mentioned photoconductor position sensor 5, original platen home position sensor 16, paper feed sensor 17, registration roller heavy paper sensor i
Information such as the s, ms key 20, start key 22, numeric keypad 23 and clear stop key 24 is given to the input board of the microcombi s, -y 29.

R and AM of the microcomputer 29 are provided with a copy section number counter for counting input values from the numeric keypad 23, a copy execution number counter for counting the number of copies to be executed based on an output signal from a paper discharge sensor (not shown), and the like. It is being

The output port of the microcomputer 29 is connected to a drive means 30 for driving the photoreceptor 2, a drive means 31 for driving the document table 7b, a paper feed roller 10b1 of the paper feed device 10, a relay roller IOd, an auxiliary roller 10f, and a registration roller 10ek. A driving means 32 for driving, driving means (not shown) for each device of the electronic copying machine, a copy section number display 25, a copy execution number display 26, and a jam indicator 2.
7, a document table abnormality indicator 28, and the like are connected.

Next, an example of the operation of the electronic copying machine of the present invention will be explained based on FIG.

The ON signal of the power key 20 is the microcomputer 2
9, the operation is executed according to the program shown in the flowchart of FIG. 5 stored in the I70M of the micro combinator 29.

First, perform initial settings in step ①. In this initial setting, the RAM of the microcomputer 29 and the input/output capo/
- After the data is cleared, a predetermined device such as the fixing device 12 is turned on to enable copying. In this initial setting, the document table 7b is placed at the position shown in FIG.

Next, in step (2), it is checked whether the start key 22 is turned on. At step ■, start key 22 is set to O.
If it is determined to be N, the paper feed roller Rob is
The transfer paper P is fed by
Move b backward in the direction of the home position, that is, in the direction of arrow a in FIG. Sensor 16 is O
If it is determined that it is not N, it is checked in step (2) whether 1°≧t&. This tx is the elapsed time from the time when the document table 7b starts the backward movement, and tl is the time required from the time when the document table 7b starts the backward movement until it reaches the home position when the document table 7b moves normally. be. If it is determined in step (2) that tx≧ta is not true, the process returns to step (2). If it is determined in step (2) that tx≧ta, the operation is stopped after turning on the original platen abnormality indicator 28i in step (2).

If it is determined that the document table home position sensor 16 is ON in the above step (2), the document table 7b is stopped and placed at the home position in step (2). Next step ■
It is checked whether the paper feed sensor 17 is ON or not.

If it is determined in step (2) that the paper feed sensor 17 is not ON, it is checked in step [phase] whether ty≧tb. This ty is the elapsed time from the time when the feeding of the transfer paper P was started, and tb is the elapsed time from the time when the feeding of the transfer paper P was started when the transfer paper P is fed normally. This is the time required for the leading edge of the paper to reach the paper feed sensor 17. If it is determined in step [phase] that ty≧tb is not satisfied, the process returns to step (2). In step [phase] ty≧
tb, the jam indicator 27 is displayed at step 0.
After setting it to iON, it stops working.

If it is determined that the paper feed sensor 17 is ON in step (3) above, an image forming operation is executed in step [phase]. In the image forming operation of step @, first, the driving means 30 of the photoreceptor 2 is turned on, and the charging device 6, the exposure lamp 7C1 of the exposure device 7, the developing device 8, the transfer device 9, the cleaning device 14, the static eliminating device 15, etc. When the devices related to image formation are turned on, and then the photoreceptor position sensor 5 is turned on, the forward movement of the document table 7b is started and exposure is started, and the image light is applied to the entire surface of the document. When exposure is performed, the original platen 7
b is moved back and returns to the home position. During this time, an electrostatic latent image is formed on the photoreceptor 2 by the exposure device 7, this electrostatic latent image is converted into a toner image by the developing device 8, and this toner image is transferred to the transfer sheet fed by the paper feeding device 10. The toner image is transferred to the transfer paper P by the transfer device 9, the transfer paper P is transported by the transfer paper conveyance device 11, the toner image is fixed on the transfer paper P by the fixing device 12, and then the transfer paper P is transferred to the paper discharge device 1.
3, the paper is ejected to a paper ejection tray (not shown).

Next, in step 0, it is checked whether [copy set sheet number counter]=[copy execution sheet number counter] or not.

If it is determined in step ◎ that the [copy set sheet number counter] is not equal to the [copy execution sheet number counter], the process returns to step 0 and the image forming operation is executed. If it is determined in step ◎ that [copy set sheet number counter] = [copy execution sheet number counter], the operation is stopped.

Effects In the present invention, since the document table is placed at the reference position and the image forming operation is started when the transfer paper is fed and reaches a position where there is almost no slip, the amount of slip of the transfer paper;
If it is small, the first copy time can be shortened.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing the electronic copying machine of the present invention, the second factor is a plan view showing the photoreceptor of the above electronic copying machine, Fig. 3 is a plan view showing the operation display panel of the above electronic copying machine, and the fourth The figure is a block diagram showing a control device of the electronic copying machine mentioned above, and FIG. 5 is a flowchart for explaining an example of the operation of the electronic copying machine mentioned above. 2... Photoreceptor, 7... Exposure device, 7b... Original platen, 10... Paper feeding device, 16... Original platen home position sensor, 17... Paper feeding sensor, P...・Transfer paper%4■

Claims (1)

[Claims] In an electronic copying machine that exposes a photoreceptor to image light from the original by reciprocating a document table on which a document is placed, the document table is placed at a reference position and a position where transfer paper is fed and hardly slips. An electronic copying machine characterized in that an image forming operation is started from the time when .