JPS5939742B2 - Copy machine control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for a copying machine that can perform a number of copying functions such as monochrome, two-color, and full-color in a unified and simplified manner.

In a conventional black-and-white camera, a series of processes are monotonous as a whole, although there are various process modes for one rotation of the photosensitive drum.

Specifically, for example, after pressing the copy start switch as shown in Figure 1-a, the photosensitive drum is idled twice, which is called pre-idling (pre-exposure to compensate for the characteristics of the photoconductor, etc.).
If the first copying process P1 (charging, exposure, development, transfer, etc.) is started, and the number of copies set on the copy selector is 1 at the completion of P1, P2 is skipped and the process starts idling (photoconductor cleaning, etc.). The copying operation is completed by performing the so-called idle rotation twice, and when copying two or more sheets, the copying operation is repeated from P1 to P2 (generally P2).
After repeating P2 several times, a count-up signal is obtained from the copy selector, and the operation is completed by performing a rear idle rotation several times. However, in multi-purpose copying machines such as color copying machines, there are various color modes such as 3-color full copy, 2-color copy, and each single-color copy as shown in Figure 1-b, and there are also various color modes depending on each color mode. Since the configurations of the copying process modes are different, the control method for the copying process is complicated.

For example, in the case of two-sheet copying, in a conventional copying machine, the copying process modes are front shaft 1, front shaft 2, and P4, as is clear from Figure 1-a.
, P2, rear axis 1, and rear axis 2, totaling 6 pieces, whereas in full color there are front axis 1, front axis 2, Y1 (yellow process), M1 (magenta process), C1 (cyan process).
and Y. ,M. ,C. (yellow, magenta, cyan process for each second and subsequent sheets), rear axis 1, and rear axis 2, a total of 10 modes. Similarly, there are 8 and 4 process modes for two-color and single-color color modes, respectively, and therefore a total of 22 copy process modes are required in a multi-purpose copying machine such as a color copying machine. It is necessary to obtain at least 22 mode signals for mode control.
Furthermore, the conditions for generating control signals for devices that are activated or deactivated in each process mode become complicated. The present invention enables sequence control to be easily performed in a copying machine in which the processes described above are complicated. That is, means for setting a count value indicating the completion of the image forming process and a count value for the process to proceed after the completion of the image forming process, a counting means for counting pulses generated at the same interval, and a process control signal by counting the pulses by the counting means. and a means for forming, when the counting means counts the set value indicating completion of the image forming process, the forming means sets a value set by the setting means for a process to proceed after the completion of the image forming process. It is characterized by having means for reading set values into the counting means, further counting pulses based on the set values read by the reading means to generate a process control signal, and sequentially controlling a series of processes. It is something to do. FIG. 2 is a block diagram of a multi-purpose copying machine, such as a color copying machine. In the figure, 1 is a photosensitive drum, which is designed to produce two images per rotation.

2 is a DC charger, 3 is an AC charger, 4 is an adsorption charger,
Reference numeral 5 denotes a transfer drum, which has a diameter half that of the photosensitive drum.

Developing units 6 to 9 are for yellow, magenta, cyan, and black, respectively.

10 is an exposure lamp, 11 is an original platen, 12 is an optical system, 1
3 is a color separation filter, 14 is a paper feed roller, 15 is a timing roller, 16 is a fixing device, and 17 is a separation claw.

First, in the case of full color, when the copy start switch is pressed, the main motor starts operating, various chargers, exposure lamps, and mirror systems start operating, and the photosensitive drum and transfer drum start rotating.

When the transfer drum has idly rotated twice, the copy paper is fed by the paper feed roller, while the exposure lamp is turned on and the first
When the document is scanned for the second time, an electrostatic latent image of yellow 1 is created on the photosensitive plate through the blue color separation filter 1, and a visible image of yellow 1 is obtained by developing device 6. This is transferred onto the copy paper wrapped around the gripper 25 on the transfer drum. When moving to the second scan, the color separation filter 13
The color changes to green, and a magenta electrostatic latent image is created on the photosensitive plate in the same manner as described above. This is made into a magenta visible image using a developing device No. 7. This magenta image is again superimposed on the above-mentioned yellow image on the copy paper on the transfer drum. When the third scan begins, the color separation filter 1 switches to red, creates a cyan electrostatic latent image on the photosensitive drum, creates a cyan visible image with the developing unit 8, and transfers it to the copy paper on the transfer drum. Superimpose it again. After the three colors are superimposed, a separating claw 17 is created to separate the copy paper on the transfer drum. The copy paper separated from the transfer drum (the gripper 25 has already been released) enters the fixing device 16 by a conveyor belt, and after being fixed, is discharged from the copying machine by a discharge roller. In the case of two-color printing, copying is completed in the same manner after going through the above process for the two selected colors. Next, in the case of monochrome copying, for example, when making yellow copies, the copy paper is fed immediately when the copy start switch is pressed, while the exposure lamp charger also operates at the same time.
Scan the original. At this time, an ND filter 1 is prepared as the color separation filter 1. Therefore, an electrostatic latent image similar to that in black-and-white copying is obtained on the photosensitive drum, but since the developing device is 6 yellow 1, the visible image is yellow 1. This is transferred onto copy paper on a transfer drum, separated from the transfer drum by a separating claw, and discharged after being fixed. Note that depending on the selection of each color, at least the developing device drive timing differs even within each copying process mode signal. Next, an example of a copying process mode signal generating circuit according to the present invention will be explained with reference to FIG.

The drum pulse is a pulse generator that generates one pulse per rotation of the drum, and the counter is a binary counter that counts the pulses and creates a copying process mode signal.
J is a setting device that checks the completion of the copying process when copying one sheet, K is a setting device that checks the completion of the copying process when copying two or more sheets, and L is a setting device that checks the completion of all copying processes. L is composed of a diode matrix as shown in FIG. C, D, and E are comparators that detect the match between the setting values of each of the setting devices and the counted value of the counter, A, B, and M are AND gates, F is an inverter, and G
is an OR gate, H is a flip-flop, N and P are one-shot multi, R is a digital switch configured as shown in Figure 6, and the decoder is a circuit that converts the counter signal into decimal, and this mode signal and monochrome, full color, etc. Various process mode signals are obtained by combining these color mode signals in a configuration as shown in FIG. The drum pulse is the second
The signal is from a switch provided at the home position on the transfer drum shown in the figure, and one pulse is output for each rotation of the transfer drum. The ``count up'' signal is a signal of ``'' level that is sent from the copy selector 1 when the number of copies reaches the set number of copies of the copy selector 1. The initial reset signal is a signal that clears the machine sequence circuit for a predetermined period of time (for example, 1 second) when the copying machine is powered on, and here resets the counter.
SB remains “L” after power is turned on until copying starts.
Signal at level 〒? is a signal that goes to "L" level when the start switch is pressed when the color mode selection switch of the copying machine is single color (any of Y, M, C, BK), and 2 colors is a signal that goes to the "L" level when 2-color copy is pressed. The color signal indicates the signal that becomes "L" level when full color mode is pressed and started. These are the signals determined and sent by each color selection switch and start switch on the operation panel. Next, we will explain the outline of the operation according to each color mode.

When the power is turned on to the copying machine, the initial reset signal is activated and the counter is set to O. Therefore, all decoder output terminals 0 to 9 are at L level. Since the copy start signal has not been pressed yet, SB-゛L-Single color-Two colors One color 1゛H゛Therefore, the setting values 1, 2, 3 are 21, 21, 22.
, 23 inputs are all "L". Since the output of digital comparator E is 0000 for both the counter output and set value 3, the STOP & RESET signal is temporarily released. Now, press the full color selection switch and press the start switch. The color is "L" and the others are "H", setting value 1 is 0101-5, setting value 2 is 10008, setting value 3 is 10
It becomes 10-10.

The main motor starts with the start switch, and a series of operations including rotation of the photosensitive drum and transfer drum begin. The process is shown in the time chart of FIG. If we focus only on the transfer drum and examine the copying process mode signal, we will find that:
When the counter is O, the set values 1 and 2 of digital comparators C and D are 5 and 8, respectively, so the output is L and therefore A.
The outputs of ND gates A and B become L, and the read command signal A,
b does not appear. When the transfer drum rotates once, one drum pulse is sent, so the counter increments to one. However, similarly, signals A and b are not output. When the transfer drum continues to rotate and enters the fifth rotation, when the counter output reaches 01015 (at the start of Y2 mode), the digital comparator C outputs a coincidence output "H" level.If the number of copies set in the copy selector is 1, then Y1 Since the count-up signal is output and held when paper is fed during the period, a high level is applied to one side of gate A. As a result, the output of gate A becomes H, and data 8 of set value 2 is switched to digital by the a signal. The counter is read via R. Therefore, the counter has a set value of 2.
The signal 1000-8 is set. In other words, this means that the vehicle has jumped to the backward rotation 1 mode. When the transfer drum further rotates, the counter is incremented by the drum pulse again.
Set it to 001. This signal creates two backward rotation modes. Furthermore, when the aforementioned drum rotates once and the counter advances, it becomes 1010, which matches the set value 3, so the output of the digital comparator E becomes H, and for a certain period of time S
Sends the TOP & RESET signal to each part and stops all operations including the main motor. Next, an explanation will be given assuming a case where the number of copies is three in full color.

From the copy start, the counter is set to 01 in the same way as above.
01-5 is reached, but since the count up signal is at the "L" level, the gate A output is "L" and the counter does not read the value of the set value 2. Therefore, the drum pulse causes the counter to advance further through the process modes from Y2 to M2 to C2 and reaches counter output 1000-8. Now, the digital comparator D output becomes H, but since the count-up signal is L, the inverter F output is H, so the set value 1 data (0101- 5) is read by the counter via the digital switch R using the D signal.In other words, the mode signal becomes the Y2 signal again.The rotation of the transfer drum causes the mode Y to change again.
The process progresses from 2 to M2 and C2, but the second Y2
Since a count-up signal is generated by the third sheet of copy paper being fed at this time, the flip-flop H holds QH by the gate M in the second mode M2. Therefore, when the second counter output reaches 1000-8, even if the digital comparator D outputs a matching output, the inverter F output is "L".Therefore, the one shot timer 1P does not operate and the counter becomes 1000. It remains at -8 and is not updated.In other words, it outputs a process mode signal for rear idle rotation.If the drum continues to rotate in this state, the counter reaches 1010, and since it matches the set value 3, it sends a matching output to E, each 1 Stop the driver and at the same time reset all control circuits such as flip-flops etc.For two-color operation, press the two-color button (for example, select magenta and black) and press the start button. 2 colors -゛L
゛The setting value of J-0100. K setting value -0110
, the setting value of L is −1000.

In the case of one-sheet copying, when the drum pulse comes 4 times, C outputs a coincidence output and the count-up signal causes gate A output =
becomes ``H'', and a = ``H'' continues for a certain period of time.

This sets it. The value 2 (0110) is read into the counter and the process mode becomes backward rotation 1. With the subsequent drum pulse, the counter becomes 1000, which matches the set value 3, and a matching output is output from E, sending a stop signal to each drive section and a clear signal to the control circuit. Next, consider the case of two copies. Since the count up signal does not come even after the drum pulse comes four times, the a output is low and the counter read input signal does not operate. When the 0100 (M2) mode is passed, the second sheet is fed and the count-up signal is sent from the copy selector, so the flip-flop HO)Q output becomes ``H'' by the next drum pulse.

Therefore, even if the counter switches to 0110 and the comparator D output becomes ``H'', the F output becomes ``L'', so b-゛L.
It remains as it is. Therefore, the contents of the counter remain 0110 without any change. When the drum rotates two more times as post-processing, the counter becomes 1000 and matches the set value 3.
The E output is output, the same operation as described above occurs, and the motor stops. Next 3
Consider the case of more than one copy.

Up to the counter value of 0100, it is the same as two copies. When the count value of the counter reaches 0110, it matches the set value 2, so the D output becomes "H", but since the copy selector 1 does not count up, the F output becomes "H" and becomes b-"H".
It is. Therefore, the counter receives data with a set value of 1 (01
00) and outputs the process mode M2 signal to the decoder. When the continuous drum pulse comes, it becomes 0110 again, but when the count-up signal does not come, the b output becomes "H" again and the data of set value 1 (0100) is read and the above process is repeated.Then, the count-up signal and the flip flop H will lead to the post-rotation process and the machine will stop.Next, in the case of monochrome copying operation (for example black monochrome copying), set J - 0001.K setting -
0010, and the setting of L is -0100.

In the case of one-sheet copying, soon after the start, the paper is fed and a count-up signal is output, and the next drum pulse causes the flip-flop H (71) Q output to go high.

At the same time, the counter output becomes 0001, so the output of comparator C becomes H, and the output of a-H is maintained for a certain period of time. After reading the data of set value 2 (0010) into the counter, the process jumps to rotation. When the counter reaches 0100 due to the subsequent drum pulse, the comparator E output becomes ``H'', causing the stop operation to begin.
In the case of two copies, even if the counter reaches 0001, it has not counted up, so the counter is not updated and the counter advances further.

When the counter reaches 0010, the second sheet of copy paper has already been fed during the 0001 mode, so the output of flip-flop H(17)Q becomes ``H'' due to the count-up signal. Therefore, neither A nor b is output and the counter is not updated. When the counter reaches 0100, the stop operation starts as described above. In the case of three or more cards, the same applies as in the case of two colors.

In order to operate the actual process processing means such as a lamp by the process mode signal obtained as described above, in addition to the above-mentioned pulse generator that emits one pulse per one rotation of the transfer drum, a large number of pulse generators are generated per one rotation of the transfer drum. A pulse generator for generating pulses is separately provided to generate a decode signal and a signal for detecting the position of the transfer drum from the home position.

This will be referred to as DPS hereinafter. As an example, it is assumed that 10 pulses are generated in one rotation of the transfer drum.

The numbers written on the time chart in FIG. 4 indicate the DPS number. The process mode decoded signal obtained in FIG. 3 is finally decoded by the color mode signal as shown in FIG. 7 to become the final process mode signal. FIG. 8 shows the operation of the processing means with a second counter that sequentially counts the DPS signal and sets it at the drum pulse (home position), and a decoder that decodes the output into a position signal.
This is a circuit that determines the period. FIG. 9 shows a lamp as shown in FIG. 4 using the process mode signal (MO-M2l) of FIG. 7 and the position signal (DPSO to DPS,) of FIG.
This is a circuit for driving the paper feed solenoid, exposure lamp, etc. Although the above description has been made using a color copying machine as an example, the control method of the present invention is also effective in a black-only copying machine.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the process mode of a copying machine, Fig. 2 is a sectional view of a color copying machine to which the present invention can be applied, Fig. 3 is a circuit example showing the control system of the present invention, and Fig. 4 is a color copying machine. Figure 5 is a circuit example of the setting device in Figure 3, Figure 6 is a circuit example of the digital switch in Figure 3, and Figure 7 is the final process mode signal. FIG. 8 is an example of a position signal generation circuit, and FIG. 9 is an example of an operation control circuit for processing equipment. In FIG. 3, J, K,
L is a setting device for checking process completion, C, D, and E are comparators, and R is a digital switch.

Claims (1)

[Claims] 1 means for setting a count value indicating the completion of the image forming process and a count value for the process to proceed after the completion of the image forming process; a counting means for counting pulses generated at the same interval; and a process control signal by counting the pulses by the counting means. and a means for forming, when the counting means counts the set value indicating completion of the image forming process, the forming means sets a value set by the setting means for a process to proceed after the completion of the image forming process. It is characterized by having means for reading set values into the counting means, further counting pulses based on the set values read by the reading means to generate a process control signal, and sequentially controlling a series of processes. Copying machine control device.