JPS59171944A - Scanning controller of copying machine - Google Patents

Abstract

PURPOSE:To stop safely a scanner when paper jam occurs, by providing a recovery discriminating means, which discriminates whether the scanner is in course of the paper jam recovery operation or not, and a means which discriminates whether the scanner is returned to the home position or not when it is in course of this operation. CONSTITUTION:After a main motor and a form supply device are stopped by the occurrence of paper jam, a CPU24 discriminates whether the scanner is in course of recovery or not by discriminating that the turn-on signal from a home position sensor 22 is not inputted. If the scanner is not in course of the recovery operation, the CPU24 stops immediately a servo motor 28 through an input/output control part 27. If it is in course of the recovery operation, the CPU24 does not stop the motor 28 and allows the scanner to continue the recovery operation; and when it is returned to the home position, the sensor 22 is turned on, and the turn-on signal is sent to the CPU24 through the input/output control part 27 to stop driving the motor 28 for returning, and a slight forward driving force is given to put on the brake, and the scanner is stopped in the home position.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a set-meal feeding control device for a scanning copying machine, and in particular, to a set-meal feeding control device for a scanning copying machine, which is driven by a dedicated drive source independently of the feeding of one multidimensional object or paper. The present invention relates to a device that performs control when paper waste occurs in a set meal device V.

PRIOR ART In a conventional copying machine, when a paper jam 9 occurs, the driving force from the main motor that is applied to the set meal device is cut off at the time of copying by disengaging the clutch, and the driving force is cut off at the time of copying, even during scanning. The scanning device would stop there, waiting for the paper jam to be removed, even if the woman was in the waiting room. Normally, the scanning device moves at a higher speed when returning than when scanning, but even if the scanning device moved due to inertia due to disengagement of the clutch, the drive system was not damaged.

In addition to full-size copying, there was an increasing demand for copiers with multi-stage reduction or enlargement copying functions.
A method has been proposed in which the foot scanning device of a scanning copying machine is driven by a servo motor independently of the drive system that feeds the photoreceptor and paper, and the scanning speed is controlled according to the magnification ratio (fC, is the magnification ratio). to obtain a copy of the desired magnification.

In this scanning device, the servo motor and the scanning device are directly connected by gears, wires, etc., and no clutch is interposed between the motor and the device. Therefore, if a paper jam occurs during a high-speed return operation, if the motor is immediately stopped, the inertia of the device may damage the drive system such as the motor and gears.

OBJECTS OF THE INVENTION Accordingly, it is an object of the present invention to provide a scanning control device that can safely stop a scanning device equipped with a drive source independent of the other drive systems of a copying machine when a paper jam occurs. It is in.

Structure of the Invention As shown in FIG. Judgment means;
When it is in the return operation, it is fully equipped with a means to check whether it has returned to the home position, and when it is not in the return operation, it is stopped at the time of the scanning device meeting ('') so that all paper jams can be removed, and when it is in the return operation. The paper jam detection means, the return determination means, The home position confirmation means etc. can also be realized using a microcomputer.

EXAMPLES Hereinafter, examples of the present invention will be described with reference to the drawings. FIG. 2 shows an outline of a scanning type copying machine, and before explaining the scanning control device of the present invention, an outline of its configuration and operation will be explained.

In FIG. 2, a document 2 is placed on a platen 1, and below the platen 1 there are provided lamps and mirrors that move at a predetermined speed in the direction of arrow A. This Fukurun f3 of the former school irradiates the document 2 on the platen, and the reflected light is reflected by the mirror 4 that moves together with the lamp 3. The mirror 4 moves at half the speed of the lamp 3. The lens 7K is directed through the mirror 5.6,
The fc source light passes through the lens 1 and is projected onto the photosensitive drum 9 via the image mirror 8.

The sensitive body drum 9 is rotated in the direction of arrow B in synchronization with the fixed feeding speed of the J rainbow drum, and the surface of the J rainbow drum is uniformly charged to the corona charger 10 on the upstream side of the kiln position where the optical image is projected. Because it is electrically charged, the charge on the rainbow surface is selectively dissipated by lightning, forming an electrostatic latent image. This latent image is
Then, a toner image is formed by nib development, and this toner image is sent to a transfer position.

A corona discharger 12 is provided at the transfer position, and copy paper (not shown) is sent to the transfer position from the copy paper cassette 13 through the entire copy paper feed path 14 in accordance with the toner image. The copy paper is fed at the same speed as the circumferential speed of the drum 9, and the feed path 14 is provided with an alignment gate 15 in the middle so that the toner image is transferred to the proper position on all the sheets. The gate 15 closes the paper sent from the cassette 13 at the same time as the start of scanning, and temporarily stops the paper, and after a predetermined period of time, the stop is completely released, the copy paper is fully advanced, and a corona discharger for transfer is placed on the paper. 12, the toner image is transferred to the proper position. A copy paper protrusion sensor 16 is provided at a predetermined position in the feeding path 14, and turns on at the leading edge of the copy paper and turns off when the edge of the cassette passes, thereby detecting the feeding of the copy paper.

After the transfer, the copy paper is transferred to the transport belt 17 etc.
811c will be sent at the same time. An exit sensor 19 is provided near the exit of the belt 17 to detect when the copy paper passes through the belt 17.Then, the toner image on the paper is fixed to an output tray (not shown). is output to. On the other hand, the surface of the drum 9 is cleaned and neutralized by a cleaning device 20 or the like in preparation for the next image formation.

The above is a general explanation of the leg-distortion type copying machine.

These four scanning copiers have not only the same-size copying function, but also the copying function of various magnifications, such as gQ reduction, 70 reduction,
Functions such as /2θ tsumi enlargement are provided. In order to obtain this divine magnification, an f-& motor is provided to scan the nine threads, independent of the drive source for moving the drum etc.
This motor is connected so as to directly drive a carriage (not shown) that supports gears, wires, etc., a lamp 3, etc. During full-size copying, each drive system is controlled so that the scanning speed of the K-light lamp 3, the photosensitive drum 90 circumferential speed, and the copy paper feeding speed are the same, and during reduction copying, only the scanning speed of the lamp 3 is controlled. speeded up according to the reduction rate,
During enlarged copying, the scan speed of the rung is slowed down. Note that the return speed of the scanning device is set to be about three times the fixed speed for copying at the same size, regardless of the magnification.

The joining lamps 3 and 4 are held by a carriage, and are moved forward or scanned by the carriage a predetermined distance in the direction of arrow A from a scanning start position, that is, a home position.

The maximum scanning length is fixed in size, and scanning longer than that will damage the scanning device, such as the lamp, including the carriage, and the copying machine itself, so a scanning end sensor 21 is provided to detect the end of the longest possible set meal. ing. Further, at the start end of scanning on the opposite side, that is, at the home position, a home position detection sensor 22 is provided to detect that the scanning device is at the home position.

A paper sensor 16 and an exit sensor 19 detect the occurrence of a copy paper jam υ. That is, there is a case where the paper does not reach the paper sensor 16 after a predetermined period of time after the paper is fed from the cassette 13 and the sensor 16 is not turned on, and a case where the sensor 16 is turned on and the position is adjusted.
This is a case where the exit sensor 19 is not reached and the sensor 19 is not turned on after a predetermined period of time after the port 15 is opened. When a paper jam is detected in this way, the drive system that feeds the paper and the drive system that rotates the photoreceptor drum are immediately stopped, but the scanning thread is directly moved by an independent servo motor as described above. In particular, if you suddenly stop the gear while it is in the process of returning, the inertia may cause the gears and wires to become damaged.
It will be stopped according to city control, which will be explained later.

The above operation is performed by the control circuit shown in FIG.
1 suppressed. Central processing unit (hereinafter referred to as CPU)
24 inputs and outputs input and output via the address and r-data/%'' space 26 according to the programmed data sent to the read-only memory (hereinafter referred to as ROM) 25.
The on Φ off signal (line 29) and the forward/backward signal (line 30) are applied to the servo motor 28 which supplies life metal to the 11 part 27 and moves or scans the nine threads of the lamp 4, etc.
'fc give. The CPU 24 also gives a command to the counter 31 (preferably a programmable expense counter) to change the frequency of the clock signal input to the counter 31 and the various magnifications of the first copy machine.
A clock pulse of a predetermined chest wave number is applied to the motor 28 via the motor 28, and the motor 28 is rotated at a speed corresponding to the magnification. During reduction copying, the frequency of the clock pulse applied to the motor 28 is one level higher than that during full-size copying, and conversely, during enlarged copying, the frequency is lower. Such a change in frequency occurs only when the motor 28 is driven forward, and when the optical system such as the rung is returned to its original position when moving backward, a constant high frequency is maintained regardless of the set magnification, and a rapid return occurs. When returning to the home position, it is preferable that the sensor 22 is turned on (9), and then a brake is applied, such as reversing the motor 28, to stop the motor 28 at the home position.

In addition, the scanning end sensor 2 is located in the input/output city 1 ↓ tower section 28.
1. When signals from the home position sensor 22, paper sensor 16, exit sensor 19, etc. are input,
In addition to the drive signal to the servo motor 28, signals are output for stopping the main motor and paper feeder. Signals from the paper sensor 16 and exit sensor 19 are sent to the cassette 1.
3, but the paper does not reach the paper sensor 16 even after a certain period of time has passed, or when the paper does not reach the exit sensor 19 even after a certain period of time has passed after opening the gate 15, the CPU 24 Both sensors and the CPU operate as paper jam detection means. When this paper jam D' is detected, a stop signal is sent from the input/output control section 27 to the main motor and the paper feeder, and both drive systems are immediately stopped.

Next, the stopping of the scanning device when a paper jam occurs, which is performed by the scanning control device according to the present invention, will be described. When a paper jam occurs and the main motor and paper feeder are stopped, it is first determined whether the scanning device is returning or not based on the paper clumping detection signal. This means that the input/output control unit 2T outputs the servo motor 28 (reverse signal and motor on signal), and the on signal from the home position sensor 22 is not input.
What U24 decides [is done by engineering]. By using this @set, when the set meal device is not in the return operation, the CPU 24
1-1: Input/output control unit 27 Servo motor 28 via gold
Immediately stops the paper jam and removes all copier panels (not shown).
to prepare for paper jam removal.

If paper stickiness occurs during the return operation of the set meal device, c.
The pu24 continues the return operation without completely stopping the servo motor 28, and uses the random access memory (RAM) 35 in FIG. 3 to set a flag indicating that the paper jam p is being returned. do. Scanning @ When the plate returns to the home position, the home position sensor 22 turns on υ on 1
The signal is sent to the CPU 24 via the input/output control section 21.

The VCL CPU stops the normal return and stop operation, that is, the return drive of the servo motor 28, and further applies a forward driving force 4 to apply a brake to stop the scanning device at the Baum position. After stopping the scanning device, C
The PU checks the RAAl2S3 flag, and if the flag is present, displays a paper jam on the operation panel and at the same time resets all flags to prepare for removing the paper jam. A flowchart of these operations is shown in Figure 2. In addition, after all paper jams have been removed, the conventional printer, scanning device, and paper are returned to their initial positions to prepare for the next scan.

Although the above embodiments have been explained using a scanning optical system in which the rung and mirror move, the present invention can also be applied to a VJ-type document transfer device in which these missing character systems are fixed and the platen moves. can. The drawing system according to the present invention is a microcomputer (CPU).

ROIVI, RAM, counter, input/output control unit), but also a conventional individual mR circuit can be used.

Effects of the Invention According to this investigation, the unique drive system of Tawara Shasho is different from other drive systems in that it can safely scan even when paper jams occur in the scanning device that is mounted without using a clutch. It is possible to completely stop the device, and in particular, it can be stopped without damaging the scanning device, which returns at commercial speed, and connecting members (gears, wires, etc.).

[Brief explanation of the drawing]

FIG. 7 is a functional block diagram of a scanning control device according to the invention;
FIG. 2 is a schematic diagram of a scanning copying system, FIG. 3 is a circuit diagram of an apparatus according to an embodiment of the present invention, and FIG. 9 is a flowchart showing the operation of the scanning control device according to the present invention when a jam occurs. . DESCRIPTION OF SYMBOLS 1...Platen, 2...Original, 3...Exposure lamp, 9...Photosensitive drum, 11...Developer, 13...
- Paper cassette, 14... Feeding path, 15... Aligning dart, 16... Paper sensor, 19... Exit sensor, 22... Home position sensor, 24... CPU,
25...ROM. 27... Input/output open side 1 part, 28... Servo motor,
31...Counter, 35...RAM0 Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] kA! by an independent drive source separate from the power of the various movable parts of the copying machine. @! ] A control device for a scanning device that has been designed to include a paper jam detection means, a means connected to the detection means for determining whether or not the scanning device is in a rear tightening operation when a paper jam occurs, and the determination device means for stopping the operation of the drive source of the scanning device upon receiving a non-return signal from the means; means for detecting that the scanning device is in the Baume position; and a means for outputting a signal to the drive source stop means when the robot returns to the Baum position.
A scanning control device for a copying machine.