JPS58214172A - Image forming device - Google Patents

Abstract

PURPOSE:To avoid giving an evil effect to copying, by not omitting completely a jam detector but turning off only a process means that is inconvenient to continue the operation of a transfer charger, etc. in case the copying is carried out while a jam keller switch is actuated and therefore avoiding the toner conmination of said precess means and its periphery. CONSTITUTION:When an input signal of ''non-detection of paper'' is delivered to a CPU from a jam detector A at the timing by which the tip of the paper wound round a transfer drum 7 reaches the position of a transfer electrifier 22 after pusing a copy button, a ''jam'' is decided and displayed to stop the operation of a machine. A jam is decided by a program of the CPU during the actuation of a jam killer SW, and the eletrifier 22 is turned off to display the jam even through a copy SW is turned on. In this case, other process operations are continued to prevent the toner on a drum from scattering and attaching to the electrifur 22 and a transfer drum 7.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sequence control device for a copying machine. Conventionally, a copying machine has a jam detection device, which stops the copying operation when the jam detection device is activated. However, there are 11! In this machine, when assembling the machine or when setting up the machine, the copying operation is performed without feeding the copy paper to check the operation of the load, so even if the jam detection means determines that there is a jam, it will not be considered as a jam. There is a jam killing switch to prevent the paper from jamming, but if you activate this switch and perform a copy operation, even if a jam occurs due to a sheet being inserted for some reason, the load will be removed as if the jam had never occurred. Due to this operation, for example, a large amount of toner developed on the photosensitive drum adheres to the transfer charger and its surroundings, which has an adverse effect on subsequent copies and requires a great deal of effort to clean.

Therefore, in the present invention, for example, when copying is performed with the above-mentioned jam killing switch activated, the jam detection is not completely turned off, but the jam detection causes at least a process that is inconvenient for the continuation of the operation of the power converter, etc. By turning off the process means and continuing other process means, the purpose is to prevent toner stains on the process means or its surroundings and eliminate the above-mentioned problems. It has a switch to kill the abnormality detection of the clock burner generator, so that it can continue the operation that would normally stop even if an abnormality occurs, but in that case, instead of completely turning off the abnormality detection, it turns off the light rung and the heater. The present invention will be explained in detail below. Figure 1 is a sectional view of the structure of a color copying machine. 1at 1b is for storing copy paper. cassette, 2a, 2b are paper feed rollers, roller a, 3
b, 4.5 is a timing roller that takes the timing of transporting the fed copy paper; 7 is a transfer drum that wraps the copy paper for transfer; 6 is a gripper that holds the copy paper firmly on the transfer drum; , 8 is a photosensitive drum for forming a latent image, and 9a to 9d are developing devices for developing on the photosensitive drum 8. On the photosensitive drum,..., 17att),
18, 19.

21 performs charging and neutralization, and the exposure lamp 11
When the document surface 10 is irradiated by the mirror 14, the reflected light is reflected by the mirror 14.
Lens 1'5. Mirror 14'9 color separation filter 15a-
4. The light passes through the mirror 16 and is irradiated to the position 19 for exposure. In the same figure (N, ■, and ◎ are jam detection devices each consisting of a light emitting section and a light receiving section, each forming a circuit as shown in FIG. 2).

After the copy paper has been transferred at position 22, it is separated by a separation claw 26 and transferred to a conveyor belt 24. After passing through the printer 25, the paper is discharged from the discharge port 29 to the tray O, and the copying process is completed. Turning on the load in this copier.

The turning off and input processing of input signals, such as jam detection signals, are all controlled by the microcomputer 31 shown in FIG. Output signals for turning on and off the loads are generated by the CPU 31, sent to the port controller 4, and sent to each load 69 via the buffer driver 66. Furthermore, input signals 40 from various centers are latched into the input board 35 via the interface circuit 37, taken in by the CPU 31, and processed.

In FIG. 2, when there is paper between the lamp 42 and the gas light receiving element 440, the resistance across the Oa and S light receiving elements 44 increases, the potential at point P exceeds the potential at point Q, and the output of comparator 47 increases. falls to "L", so gor4B+-
, 1, the output li becomes ``H'' and goes through the interface circuit 67 and the input port 35.
1" is input to p u 31. 1 is input between o42 and 44.
1 (when not present, the resistance at both ends of 440 becomes small, so P
The potential at the point becomes lower than the potential at the Q point, so the output of the comparator 47 becomes H'', and the Tr 48 turns on, so the output becomes Ll+. Jin's No. 13 is connected to C through 37.35e.
PUK “0”,! : Lte is input. Therefore, for example, after the copy button is pressed, the paper feed roller 2a (or 2b) is activated, the timing of conveyance is determined by 3a (also tj: 3b) + 4 + 5, the sheet is firmly held by the gripper 6, and then copied onto the transfer drum 7. When the leading edge of the copy paper reaches the position of the transfer roller lfL device 22 when the paper is wrapped, a signal is input to the CPU via the buffer and port of the jam detector. If not, the CPU considers it to be a jam, displays the JAM display, and takes measures such as stopping the machine.However, when it is in VD mode, the SW is activated in the circuit shown in Figure 4. This is realized by connecting L to contact 11111K, and this output becomes ``1''.
becomes. At this time, number 5! It is determined by the CPU program in steps 1 and 2 whether or not it is the C Jim X' frame according to the flow of step 1. At step B, jab 5. Even if the kill switch is ON, the transfer charger is turned off and a jam display is displayed, but other process operations continue. Therefore, the toner developed on the photosensitive drum can be prevented from coming into contact with, scattering, or adhering to the transfer charger and the transfer drum. When the jam kill switch SW1 is off, the operation of all process means is interrupted in the event of a Vt jam. As shown in FIG. 6, the transfer charger receives a signal ff0f' from the CPU, so that 1 is input to the input 148 of the high voltage generation circuit 147, causing the transfer charger 22 to generate high voltage, and the signal "1" By sending out 0'', the input 148 of the high voltage generation circuit 147 is set to green, which turns off the high voltage.

As described above, according to the present invention, when the process means is operated in an unusual sequence due to the operation of the jam killing switch, etc., the load operation can be checked without staining the transfer drum or transfer charger with toner. This reduces cleaning effort and extends the life of the transfer charger and drum.

[Brief explanation of drawings]

Yard, tP, Figure 6 is a high voltage generation circuit diagram, and in the figure sw
IH is a jam-killing switch. Applicant: Gyanon Co., Ltd. Al! People Gi Marushima −

Claims (2)

[Claims] (1) A plurality of process means for image formation, means for sequentially controlling the above-mentioned process means in other modes, and means for continuing the sequence by deactivating a predetermined process means when an abnormality occurs during the control operation. An image forming apparatus having: (2) The image forming apparatus according to item 1, wherein the other mode is a mode in which the apparatus stop control due to jam detection is omitted and operation continues. 2. The image forming apparatus according to claim 1, wherein the inactive process means is a transfer corona means.