JPH02105167A - Control method for copying device - Google Patents

Abstract

PURPOSE:To eliminate a decrease in operation rate and unnecessary service cost by resetting and restarting a subcontrol part through hardware by a main control part when an abnormal signal is detected and disabling the copying machine to be used when the abnormal signal of the subcontrol part is detected again. CONSTITUTION:When the main control part 11 detects the abnormal signal of the subcontrol part 12 at the time of turning on the power source, the main control part 11 resets the subcontrol part 12 through hardware and restarts it. Then when the abnormal signal of the subcontrol part 12 is detected, the copying machine is disabled to be used and the abnormality is displayed. Thus, even when the abnormal signal of the subcontrol part 12 is detected, the copying operation is not inhibited immediately and it is judged whether or not the abnormality is misdetected by a sensor, etc., thereby inhibiting the copying operation only in case of real abnormality. Consequently, the decrease in the operation rate and unnecessary service cost due to the misdetection of an abnormal state are eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of controlling a copying apparatus, and more particularly to a method of controlling a copying apparatus in an abnormal state.

[Conventional technology]

Generally, when a copying machine is powered on, a so-called homing operation is performed so that the movable members of the scanning/magnification system are in a predetermined position.

At this time, each unit performs a different operation, but depending on the operation, the detection element at a predetermined position reaches zero in a predetermined time.
Check the N10FF status to determine whether it is abnormal.

If an abnormality is detected, the copying operation is normally prohibited because if the copying operation is continued, there is a risk that an abnormal image will be generated (image position shift, image magnification shift, etc.) or that the movable member will be damaged.

[Problem to be solved by the invention]

However, each detection element is affected by noise, static electricity, etc.
In some cases, the machine may make a false positive detection even though it is actually normal. Further, the detection timing may be delayed due to a slight movement of the mechanism that does not interfere with the copying operation. Furthermore, due to noise etc., the CP of the scanning/variable magnification system
Sometimes U is out of control.

In any of the above cases, the copying operation is prohibited, resulting in a decrease in the operating rate, and in many cases, the cause cannot be determined even if a service person is contacted for investigation, resulting in high service costs.

The purpose of the present invention is to prevent false detection of various sensors due to noise, static electricity, or a slight delay in homing operation.
It is an object of the present invention to provide a control method for a copying apparatus that can prevent a decrease in operating rate and unnecessary service costs by not determining that there is an abnormality in the scanning/optical system.

[Means to solve the problem]

In order to achieve the above object, the present invention has a main control section that executes main control of a copying machine, and a sub-control section that executes control of scanning and variable magnification systems. When the section detects an abnormal signal from the sub-control section, the main control section hard-resets the sub-control section and restarts the sub-control section, and when the sub-control section detects an abnormal signal from the sub-control section again, the copying machine is restarted. It is characterized in that it is rendered unusable and an abnormality is displayed.

[Effect]

In the present invention, by using the above method, even if an abnormal signal from the sub-control unit is detected, the copying operation is not immediately prohibited;
The system re-determines whether or not it is a false detection by the sensors, and prohibits the copying operation only in the case of a true abnormality.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a control system according to an embodiment of the present invention, and FIG.
The figure is a block diagram showing details around the main control section, and FIG. 3 is a perspective view showing an outline of the optical system.

In FIG. 3, 1 is a first scanner, 2 is a second scanner, 3 is an actuator, 4 is a scanner wire, 5 is a scanner motor, 6 is a scanner home position (HP) sensor, and 7 is a guide.

The first scanner 1 and the second scanner 2 are equipped with a light source, a mirror, etc. as is well known, and are moved by being driven by a scanner motor 5 disposed on the side via a scanner wire 4 and an actuator 3. The movements of the first scanner 1 and the second scanner 2 are guided by a guide 7, and their initial positions are assumed to be where the scanner [1P sensor 6 is on].

1 and 2, 10 is a main board, 11 is a main CPU (central processing unit) which is a main control section,
12 is an optical CPU which is a sub-control unit, 13 is a fixing thermistor, 14 is a phototransitor for detecting an exposure lamp, 15 is an encoder, 16 is an exposure lamp, 17 is a heater, 18 is a main motor, 19 is a power supply, and 20 is a main switch, 2
1 is a reload check section, 22 is a disconnection check section, 23
24 is a lamp high temperature check section; 25 is a high temperature check section; 24 is a lamp high temperature check section;
is reset IC126 is I10 boat, 27°28.2
9, 30, and 31 are drivers, and Ra is a relay.

The main board IO is composed of main CPU 1, 10 ports 26, reset IC 25, etc.
The puii is a one-chip CPU with built-in ROM and RAM. The optical CPU 12 is also a one-chip IC, and controls the forward and reverse movement of the scanner motor 5 via the driver 27. The scanner motor 5 has an encoder 15, and the output of the encoder 15 is used for speed control and various timings.

The output of the scanner HP sensor 6 is input to the optical CPU 12 and used as a reference position signal.

Main CPU 1 and optical CP of the main board 10
Serial communication control is performed with U12 through TXD and DXD terminals, and magnification data and other data are exchanged. Other scanner words, return and reset signals that require timing precision are input directly.

Furthermore, a fixing thermistor 13, an exposure lamp detection phototransistor 14, and various signals (not shown) are input to the main board 10. In addition, load control is executed by the main motor 18, heater 17, exposure lamp 16, relay Ra, and drivers 28, 29, 30, and 31 (not shown) that drive loads.

As shown in FIG. 2, the PCI output of the main CPU 1 and the output of the reset IC 25 are wired-OR connected and connected to the reset terminal of the optical CPU 12.

FIG. 4 is a waveform diagram of the input/output waves of the reset IC 25. When the power supply (+5V) 19 rises and falls, a signal continues to be output for a time t0, and the main CPU 1
This prevents operation at low input voltages such as

Next, each operation of the above embodiment will be explained based on the flowcharts shown in FIGS. 5 to 12.

Figures 9 to 12 show the scanner motor 5 of the optical CPU 2.
, and a flowchart showing control of a zooming motor (not shown) and the like.

When the power supply 19 is turned on in FIG. 9, the operation of the reset IC 25 in FIGS. 2 and 4 causes the optical CPU
2 is reset by hardware (9-1). When the reset signal changes from Low to High, the initialization B subroutine is executed (9-2). In Fig. 10, initialize B first starts with subroutine SUB 102.
(10-1). SOB 102 is an optical CPU
This is a routine for reading the signals input to 12, and as shown in Fig. 12, reading the scanner HP (home position) detection signal (12-1), reading the scanner motor encoder signal (12-2), and main CPU
Scanner forward and return signals are read from II (12-3), and other signals not shown are read (12-4>).

After reading the signal, perform scanner IP detection (10-
2) Initialize the positions of scanners 1 and 2. If the scanner HP sensor 6 is ONL, the scanner motor 5 should be driven in the forward direction 1O-3)
, is turned on until the encoder counter that counts the pulses of the encoder 15 reaches No (10-4). When the counter becomes No, the scanner I (P sensor 6 is checked (10-5>. Scanner) The IP sensor 6 should be OFF due to the movement of the scanner 1.2, and should not be ON at this point. If so, it is an abnormality, so the forward of the scanner motor 5 is set to 0FFL (10-13), the abnormality flag is set to ONL (10-12), and this routine is ended.

Scanner HP sensor 6 is turned on in step (10-2)
If not, or if the scanner HP sensor 6 is OFF in step (10-5), step (10-5)
0-6). In step (10-6), in order to return the scanner to the initial position, the forward drive of the scanner motor 5 is switched to 0FFL and return drive (10-6). Thereafter, SUB 102 is executed and waits for the Soot Yana HP sensor 6 to turn on (10-7).

When the scanner HP sensor 6 is ONL, the return drive of the scanner motor 5 is 0FFL (I 0-8), and then other initialization operations such as initialization of the variable magnification lens, which will not be described in detail, are performed in the same way. ,
This routine ends (10-9). Step (10
-7) When the scanner HP sensor 6 is not ONL, check the counter of the encoder 15.10-10)
, when the counter is less than N5, the process returns to step 101 and this check is repeated. If the scanner HP sensor 6 is not ONL even when the encoder counter reaches N1, it is an error, so turn off the return drive of the scanner motor 5 (10-11) and set the error flag (10-1).
2) End this routine.

Returning to FIG. 9, when the process of initialize B is completed, it is checked in step (9-3) whether the error flag is set, and if it is ON, an error code is set in the buffer for transmission to the main CPUZ. (9-4). Next, the sun to t serial communication shown in FIG. 11 is executed, and this routine continues to be executed. Step (
If the abnormality flag is not set in 9-3), next
B 101 is executed and information is exchanged with the main CPU II (11-1.1l-2). Although not described in detail here, data on variable magnification, copy size data, etc. are exchanged. Next, 5UB102 is executed to read the signal. If there is a change in the magnification data, etc. in the SUB 101 (9-, 5), the magnification change processing is performed accordingly [although not described in detail, the lens position, etc. is set (9-6)).

Next, in step (9-7), it is checked whether the scanner start signal (forward ON signal of the scanner motor 5) is present, and if it is not ON, the process returns to step 110 and waits for the arrival of the scanner start signal. If the scanner start signal is ON, the copy operation is started.

First, forward ONL of scanner motor 5 (9-8)
, while running 5UB102, check the pulse counter of encoder 15 (9-9), if the counter is NIG.
When this happens, the scanner HP sensor 6 is checked to be OFF, and it is checked whether the scanner 1.2 has operated (9-10). If the scanner II P sensor 6 is
If it is not F, it is abnormal and the forward drive of the scanner motor 5 is turned off (9-11).

At the same time, the abnormality flag is turned on and the process jumps to (9-12) (2), where the above-mentioned abnormality processing is performed. If the scanner HP sensor 6 is OFF, it is normal, so proceed to the next step 1.
Move on to 12.

While executing SUB 102 in step 112, it waits for a scanner return signal to be transmitted from main CPU 1 (9-13). Even if this signal is not received from the main CPU 1l, the copy size data is known, so
When the corresponding encoder counter N becomes □ (9-14), the scanner motor 5 is switched from forward to return (9-15).

Next, the process moves to step 113 and waits for the scanner 1°2 to return to the ho 1 position (lrP) (9-16
). While executing 5UI3102, check the scanner f (P sensor 6), and if it turns ON, turn the return drive of the scanner motor 5 to 0FFL (9-17), return to ■, and wait for the next scanner start signal.
13 (9-18), it is abnormal if the scanner HP sensor 6 is not ONL, so set the return of the scanner motor 5 to 0FFL (9-19), set the abnormality flag (9-20), and Jump to and handle the abnormality described above.

Next, the flowchart of the main CPU I will be explained with reference to FIGS. 5 to 8.

As mentioned above, the main CPU II is an optical Cr'U1
The well-known electrostatic charge of the copying machine body while interacting with 2.
It controls a series of copying processes such as exposure, development, transfer, and cleaning, and paper processing processes such as paper feeding, transfer, fixing, and paper ejection.

First, by turning on the power 19, reset 1c2 is performed as described above.
A hard reset is applied by the operation in step 5 (5-1). After that, set all loads to OFF for -15-2)
, perform input reading processing (5-3), and then relay R
Turn on a (5-4). Next, subroutine 5UBIO
Execute.

As shown in FIG. 7, after reading various input signals (7-1), 5UBIO checks that PB4.3°2 is Low (7-2).

(7-3), (7-4). PB4 and 3.2 are the terminals of the human power port of the main CPU 1 shown in FIG.
B3 is a level check of the thermistor 13 that measures the temperature of the fixing roller (not shown), and when the thermistor 13 has an abnormally low resistance, it is a signal to check as a high temperature abnormality.PB2 is a signal to check whether the thermistor 13 is disconnected. Please check. In other words, if even one of these is detected when the power supply 19 is turned on, since the object to be checked is the heat source, there is a risk of a serious failure.
7-5), the relay Ra is turned off (7-6), and the energization to these circuits (see FIG. 1) is canceled, and the next operation is not executed.

Next, if there is no problem with 5UBIO, turn on the heater control (
5-5). The heater control is performed by turning off the power to the heater 17 to 0FFL when the value of the thermistor I3, which is input to the PB1 terminal of the main CPUI 1 in FIG. 2, reaches a temperature that allows fixing.
, and if the temperature drops again, the heater 17 is turned on, which is temperature control.

Next, the process moves to step 10, and subroutine 5UBI4 (eighth
(Figure) communicates with the optical CPU 12 (8-1),
(8-2). Here, when there is a scanner error code in the signal from the optical CPU 12 (5-6), the scanner 1
．． This means that there is an abnormality in the drive of No. 2, and the following processing is executed.

First, check whether the scanner abnormality flag is set (5-7), and if it is not set, set the scanner abnormality flag (5-8), and then turn on the reset signal (5-8).
PCI in Figure 2) is output for a predetermined time 1 (5-9);
(5-10), (5-11). When the reset signal is output, the optical CP tJ 1
2 is reset.

Thereafter, when the reset 1- is applied, the optical CPU 2 re-executes the flowchart shown in FIG. 9 from the start to initialize the scanner 1.2, as described above.

Step (5-12) is the time (L,) for waiting for the above initialization process to be completed while reading the input.
(5-13).

After time t3 has elapsed, the process returns to step 10. Here, it communicates with the optical CPU 12 again, checks the scanner abnormality code again, and if it is present, checks whether the scanner abnormality flag is set. As mentioned above, the fact that this flag is set means that this routine is executed for the second time, and in this case, the heater 17 is set to 0FF.
L (5-14), jump to SC (5-15). S
C is the abnormality handling routine shown in FIG. 7, in which relay Ra is turned off after abnormality display processing. That is, if there is an abnormality in the optical system, the initialization operation is repeated twice, and if the initialization operation is still unsuccessful, an abnormality display process is performed.

Return to step (5-6). If there is no scanner error code in the first and second checks, either there is no problem, or there was a problem but the initialization operation has been canceled again.

In this case, the scanner abnormality flag is then reset (5-16).

Next, run SUB 10 and check for errors,
Read the input and check the contents of PBI (whether the value of fixing thermistor 13 is ready for fixing) 5 17), L
ow, turn on the copy permission display 5-18), then turn the copy start key to OFF while running 5UBIO.
Wait for N (5-19).

Moving on to the flowchart in Fig. 6, when the copy start key is turned ON, the main motor I8 is turned ON (6-1
), the exposure lamp 16 is turned on (6-2). In addition, other required loads (not shown) are connected to ONL (6-3),
Wait for the scanner start timing while executing SUB 12 (6-4). 5UB12 (Fig. 7) is a lighting check (P
B4 terminal) is not checked, but only the fixing thermistor 13 is checked (7-3).

When the scanner start timing comes, the scanner forward signal is turned on (6-5) and transmitted to the optical CPU 12. As described above, the optical CPU 12 receives this signal and controls the driving of the scanners 1 and 2. . Then 5UB
12. Execute SUB 14, check whether there is a scanner error code (6-6), execute the specified copy process (6-7), and continue this until the scanner return timing (6-8). repeat. During this time, the scanner HP sensor 6 is set to 0FF in the optical CPU 12 mentioned above.
If there is an abnormality, an abnormality code is generated, so the process proceeds to step (6-9) and a scanner abnormality flag is set. When this flag is set, a copy post-processing routine is executed to eject the paper in the machine without starting a new paper feed. After the paper has been ejected from the machine, this routine sets the main motor to 0FFL, a so-called standby state (6-
10). After that, the scanner abnormality flag is determined (6-
11) If the flag is set, the process jumps to ■ in FIG. 5 (6-12).

If you jump to ■, as mentioned above, the optical CPU 12
is reset, the scanner 1.2 is initialized, and the abnormality check is performed again. If the result is NG, the abnormality handling routine SC is executed. If the result of the recheck is OK, the process waits for the start of copying again.

Return to step (6-8). Here, when the scanner return timing comes, the scanner forward signal is set to 0FF.
Turn on the L return signal (6-13). Next, the exposure lamp 16 is turned off (6-14). Thereafter, this routine is repeated while executing a predetermined copy process (6-15) and 5UB12.5UB14 until the scanner returns to the HP, and during this time it is checked whether there is a scanner error code (6-16). As mentioned above, if the scanner HP sensor 6 does not turn ON at a predetermined timing in the optical CPLJ 12, an error code is generated. When this code is generated, the process proceeds to step (6-9) as described above, and the same error is detected. Execute processing.

When scanners I and 2 return to their home positions in step (6-17), the scanner return signal is set to 0FFL (
6-18), Determine whether copying is complete (6-19)
). If not completed, the process returns to step (6-2) and the next copy operation is executed.

If the copy is completed, the above-mentioned post-copy processing is executed, the scanner abnormality flag is checked (6-11), and jumps to 0 (6-20). When the program jumps to 0 in FIG. 5, it enters a standby state for the next copy start key.

〔Effect of the invention〕

As explained above, according to the present invention, the main control unit and the sub-control unit can control the copying apparatus by: I can provide a method.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a block diagram of the control system, FIG. 2 is a block diagram showing the surroundings of the main control section, and FIG.
The figure is a perspective view of the optical system, FIG. 4 is a waveform diagram of input and output waves of the IC, and FIGS. 5 and 6. 7, 8, 9, 10, and 11. FIG. 12 is a flowchart showing the operation of each part of this embodiment. IO... Main board, 11... Main control unit, 12.
...Sub-control unit. Figure 1 Figure 2 Figure 3 Figure 4 Figure 10 Haruichishin (T) Figure 7 Figure 8

Claims (1)

[Claims] It has a main control section that executes main control of the copying machine and a sub-control section that executes control of the scanning/magnification system, and when the power is turned on and the main control section detects an abnormal signal from the sub-control section. At times, the main control section hard-resets the sub-control section and restarts the sub-control section, and when an abnormal signal from the sub-control section is detected again after that, the copying machine is rendered unusable and an abnormality is displayed. A method for controlling a copying apparatus, characterized in that: