JPH0235305B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an image recording device such as a copying machine.

2. Description of the Related Art Conventionally, copying machines and the like have been known to control copying by setting various data.

In such a copying machine, when the power switch to the copying machine is turned off, the power to the control section is also turned off at the same time, and all set data is cleared. For this reason, even if the power switch is turned on again, it is necessary to newly set data, making it difficult to resume copying smoothly.

Also, it is conceivable that the power to the control unit is maintained by a backup power supply even if the power switch is turned off when a jam occurs, but after the jam is cleared,
There is a possibility that an attempt is made to restart the image forming operation in a state where power is not supplied to the process means.

The present invention eliminates the above-mentioned drawbacks of the prior art and includes a process means for recording an image and a first process means for supplying power to the apparatus for recording the image.
a switch SW1, first detection means SW4, SW5 for detecting trouble within the device;
A second detection means SW1NO for detecting the state of the first switch, a second switch 59 for enabling restart of the image recording operation after the above-mentioned trouble condition is cleared, and inputting data necessary for image recording. a memory storing a program for controlling the process means based on input data from the input means, and a plurality of input ports (FIG. 4A to C); a computer 58 that interrupts the operation of the process means when a trouble is detected by the detection means, and when a trouble is detected by the first detection means;
Even if the first switch is turned off, the power to the computer is maintained, and the computer inputs the output of the second detection means to a predetermined input port of the plurality of input ports of the computer, and The output of the second switch is inputted to the same predetermined input port, the predetermined port is designated by the program, and the bits corresponding to the first and second switches of that port are checked. 1. Means for determining the state of the second switch (Fig. 8-2, 3-29, 3
-30), and the determination means determines the first,
The object of the present invention is to provide an image recording apparatus in which determination that the second switch is turned on is a condition for restarting the operation of the process means.

This makes it possible to retain numerical data related to image recording even when the switch for applying power to the device is turned off, and also allows the computer to monitor the operating status of the switch for applying power and the switch for troubleshooting. The program detects the input to the same input port and controls the restart of image recording, so when checking the operating status of the switch for power supply and the switch for troubleshooting, the port can be specified only once. This simplifies the program configuration, improves processing speed, and allows smooth resumption of image recording.

FIG. 1 is a sectional view of a copying apparatus according to the present invention.

The surface of the drum 11 is made of a three-layer photoreceptor using a CdS photoconductor, is rotatably supported on a shaft 12, and starts rotating in the direction of an arrow 13 in response to a copy command.

When the drum 11 rotates to the normal position, the document placed on the document table glass 14 is illuminated by an illumination lamp 16 that is integrated with the first scanning mirror 15, and the reflected light is used for the first scanning. Mirror 15 and second
It is scanned by a scanning mirror 17. First scanning mirror 1
5 and the second scanning mirror 17 move at a speed ratio of 1:1/2, so that the document is scanned while the optical path length in front of the lens 18 is always kept constant.

The above reflected light image shows the lens 18 and the third mirror 19.
After passing through the fourth mirror 20, an image is formed on the drum 11 at the exposure section 21.

After the drum 11 is charged (for example, +) by a primary charger 22, the image irradiated by the irradiation lamp 16 is slit-exposed in the exposure section 21.

At the same time, AC or primary charge removal with a polarity opposite to that of the primary charge (for example, -) is performed by a charge remover 23, and then a high-contrast electrostatic latent image is formed on the drum 11 by full-surface exposure using a full-face exposure lamp 24.
The electrostatic latent image on the photosensitive drum 11 is then transferred to a developing device 25.
It is visualized as a toner image.

The transfer paper 27-1 or 27-2 in the cassette 26-1 or 26-2 is transferred to the paper feed roller 28.
-1 or 28-2 into the machine, the first register roller 29-1 or 29-2 takes approximate timing, and the second register roller 3
With accurate timing at 0, the photosensitive drum 11
sent in the direction. This can be carried out by a switch provided in the path of movement of the optical system and turned on by movement of the optical system.

Next, while the transfer paper 27-1 or 27-2 passes between the transfer charger 31 and the drum 11, the toner image on the drum 11 is transferred onto the transfer paper.

After the transfer is completed, the transfer paper is guided to the conveyor belt 32, and then to a pair of fixing rollers 33-1 and 33-2, where it is fixed by pressure and heat, and then discharged onto the tray 34.

After the transfer, the surface of the drum 11 is cleaned by a cleaning device 35 composed of an elastic blade, and the process proceeds to the next cycle.

If the transfer paper is skewed or twisted after being fed from the cassette, the rollers 29-1 and 29
- The transfer paper may not get stuck in each of the conveyance rollers 2, 30, 36, etc., and may become jammed near these rollers. In particular, if the toner gets caught up in the pair of fixing rollers 33-1 and 33-2 and is not discharged, there is a risk of fire.

Therefore, in order to detect paper jams in the image transfer material, a paper detection micro switch is installed near the exit of the conveyance path.
SW ₄ and SW ₅ are provided, and a jam is determined by detecting whether or not these detectors are operating at a predetermined time. If paper is not detected, a warning is displayed as a jam. This check signal at a predetermined time is a timing signal programmed in advance in the process sequence control circuit.

FIG. 2 is a perspective view of the copying machine shown in FIG. 1, and jam processing will be explained below.

In the figure, 201 is an opening/closing door for removing jammed paper near the fixing device, 202 is an opening/closing door for removing jammed paper near each conveyance roller, 2
03 is a copy command operation panel, 204 and 205 are indicators that display the location to be processed in the event of a jam;
SW ₁ is the AC power supply switch for the copying machine, SW ₂ is
SW ₃ is a door switch that is turned off when each opening/closing door 201 and opening/closing door 202 is opened and turned on when closed. 206
displays the number of copies entered using the number key 208, and
07 is a display that displays the number of copies that have been made, and 209 is a copy button that starts the copying process. The rest is the same as in FIG.

If there is a jam near the rollers 29-1, 29-2, 30, and 36 and the switch _SW5 does not detect paper at a predetermined timing, a non-detection signal is input to the control circuit and a jam signal is output. This output causes display 2
04 is lit to display that the door 202 is opened and the jam is to be cleared. In the case of a jam near the fuser,
When the switch SW ₄ does not detect paper at the second predetermined timing, it similarly outputs a jam signal. This output lights the display 205 to indicate that the door 201 should be opened to remove the jammed paper. Therefore, jam processing is made extremely easy and copy restart is made smooth. When the door 201 or 202 is opened, the switch SW ₂ or SW ₃ is turned off, thereby cutting off the power supply to AC loads such as the drive motor of the conveyance roller, the fixing heater, and the high voltage transformer. However, when a jam signal occurs, the DC power supply to the control circuit is switched to a line independent of the door switch and main switch systems. Therefore, the control circuit remains in operation even during the jamming process to remove paper, stores the electronically stored set number of sheets and number of copies without canceling, and displays the respective values on the display 2.
Display continues at 06,207. Furthermore, during the jamming process and after closing both the doors 201 and 202 after the jamming process, the display 207 subtracts the number of jammed sheets from the number of copies and displays the result. Therefore, continuous copying operations can be performed smoothly.

FIG. 3 shows an example of a control circuit for the above. 4
0 is a plug that takes in commercial voltage, and one line from the plug 40 is connected to the C terminal of a micro switch 42 that operates in conjunction with the door switches SW ₂ and SW ₃ and the NO terminal of a relay 50. The other line of the plug 40 is also connected to the C terminal of a micro switch 44 which operates in conjunction with the door switches SW ₂ and SW ₃ and a low voltage transformer 51. The NC terminal of the micro switch 42 is connected to the C terminal of the B contact of the main switch SW ₁ via a breaker 43. The micro switch 41 operates in conjunction with the micro switches 42 and 44, its C terminal is connected to ground, its NC terminal is connected to the C terminal of the a contact of main switch SW ₁ , and the NO terminal of the a contact of the main switch is connected to the control circuit. 58. The NC terminal of the b contact of the main switch SW ₁ is connected to the primary side of a low voltage transformer 51 via a main motor 46 that drives the copying machine, a load such as a high voltage transformer 47, and a contact of a relay 50. One terminal of the secondary coil of the low voltage transformer 51 is connected to the control circuit DC power supply 54 through the breaker 52, and the other terminal is connected to the DC load power supply 54 through the breaker 53.
5.

Here, the motor 46 rotates the photosensitive drum 11, the conveyance roller, and the fixing roller, and moves the lamp 16 and the scanning mirrors 15 and 17, and the high voltage transformer 47 operates the chargers 22, 23, and 31. . In addition, an image exposure lamp 1 is used as an AC load.
6. There is a full-surface exposure lamp 24. Main motor 4
6. Control signals for the triacs 48 and 62 for switching the heater 61 are applied at predetermined timing from the control circuit 58. The DC power supplies 54 and 55 are well-known stabilized power supplies that rectify and stabilize alternating current. As shown in FIG. 4, the control circuit is a control circuit having a well-known program memory that outputs output in the direction of the arrow in response to input signals in the direction of the arrow and in accordance with internal program data. The jam counter 56 counts up every time a jam occurs. In other words, it is a well-known mechanical counter that counts the number of jammed sheets, and the jam solenoid 57 connects the reset switch 59 to the NO terminal when the sheet jams.
9 is locked to the NO side. In this state, even if the power is turned on after jamming and the copy button is turned on, the copying process will not start. Processing becomes possible only after the switch 59 is manually switched to the NC side.

A timer 60 maintains the DC power supply to the control circuit 58 for 5 minutes after a jam occurs, and cuts off the DC power supply after 5 minutes have elapsed.

The relay 50 switches its contact to the NO side when a jam is detected, thereby switching the power line to the transformer 51.

To briefly explain the control circuit in Fig. 4,
The ROM is a program memory in which flow steps as shown in Fig. 5 are preprogrammed in binary code.
RAM is a data memory that stores program memory data and input signal data such as the number of copies.
INPUT is an input port that gates in input signals, OUTPUT is an output port that latches output signals, and ACC is an accumulator that temporarily stores data from the input port and data to the output port. It has a decoder for decoding, ROM, RAM, and an ALU for calculating and logically determining data from input/output ports.
Terminals 1 to 4 of the A port of the input port INPUT have a signal CPB that becomes 1 when the copy button is turned on, a signal JRES that becomes 1 when the jam reset switch 59 is reset to the NC side, and a signal JRES that becomes 1 when either the main switch or the door switch is turned off. signal that becomes 1
OFS, a signal that becomes 1 when the 5 minute timer goes up
TIM is input. A signal of 1 generated by turning on the switches SW ₄ and SW ₅ is input to the B port terminals 1 and 2.

A jam detection signal JAM that operates a jam solenoid 57, a timer 60, a jam counter 56,
The signal JAMR that activates the jam relay 50 is
From terminals 1 to 4 of ports, signal DMT to turn on the motor 46, signal FIX to turn on heater 61, signal to turn on high voltage transformer.
A signal PF for turning on the HVT and the transfer sheet feeding start roller 28-1 or 28-2 is output.

In this control circuit 58, the input signal is taken into the ACC according to the program step of the ROM,
It determines whether it is 1 or 0, moves to the next step, latches a predetermined output port, and turns on the target load.

Input ports 1 to 4 are number keys 20 on the operation panel.
Data _K1 to _{K4 obtained by converting the signal from 8 to 4} -bit binary coded decimal data are input. Output port G 1
~4 is a well-known seven segment number indicator 206,2
It outputs the same 4-bit data as the above code for displaying numbers on 07. If each display has two digits, there are four segment displays, so the digits can also be switched and output using a well-known method. F port SJ ₁ ,
SJ ₂ is for displaying a jam regarding SW ₄ and SW ₅ , respectively, and operates each display 205 and 204. Also, 3 of input port B is a timing signal that becomes 1 by a switch operated by a cam installed on the drum.
Enter CS. 4 inputs a signal from a switch BS ₁ installed at the path reversal position operated by a cam installed in the optical system.

The operation from turning on the power switch _SW1 will be explained with reference to FIG.

When main switch SW ₁ is turned on, motor 46,
Heater 61, high voltage transformer 47, low voltage transformer 5
Power can be supplied to the AC circuit No. 1.

The control circuit 58 is powered on by the output of the low voltage transformer 51, and the control circuit performs step 1 of the preparation cycle. In this cycle, first reset all circuits, then perform key entry,
Perform number display routine.

That is, data from the key is taken into input port C, stored in address a of RAM, and its contents are displayed on display 206 via output port G.

The program then proceeds to a routine that detects that the copy button is turned on. If the CPB is determined to be 1 in step 2, the process proceeds to step 3, which is a copy cycle execution step.

That is, first latch the E port and output the motor signal.
DMT, heater signal FIX, and high voltage signal HVT are output to turn on each triax 48 and 62 to energize the motor, heater, and high voltage transformer. When the drum rotates to a predetermined degree, the cam switch operates to input the signal CS, output the paper feed signal PF, image exposure lamp ON, and optical system forward clutch ON signal FWD to start paper feeding and exposure scanning. The clutch is used to convert the rotational force of the motor into forward force. When the exposure is completed and the optical system reaches the reversal position, a reversal signal BS is output and the circuit 58 receives it, turns off the lamp and the forward clutch, and turns on the reverse clutch to move the optical system backward.

As the drum continues to rotate, a process is executed in which a copy image is formed on the transfer paper through the development and transfer area, and the transfer paper is transported outside the machine. Then Switch SW ₄ ,
B at each time the paper would have passed through SW ₅ .
Enable port reading. And step 4
If it is determined by SW ₄ and SW ₅ that paper is being detected, the process advances to step 5. The reading of the B port is performed by a routine programmed with a timer to check the paper after a predetermined time has elapsed from the reversed position.

If paper is detected, the process proceeds to step 5, where the remaining process operations such as turning off the back clutch and turning off unnecessary high voltage transformers using drum cam input are performed, and the process proceeds to step 6. Since the jam plug is 0, it is determined and the process proceeds to step 7, where it is determined whether the number of copies is equal to the set number of sheets or not. When the number of copies is equal, copying is terminated, and after the paper is ejected, the main motor is turned off and the process returns to step 1.

Here, the jam flag is data at address J of the RAM where 1 is stored when a jam is detected.

When it is determined in step 4 that no paper is detected, that is, a jam is detected, the output port D is latched in step 8, a jam signal I, a jam counter, and a jam relay signal J are output, and a jam flag is set. This turns on the jam solenoid 57 and switches the reset switch 59 to the NO terminal.
Also, the relay 50 is activated to connect the primary of the low voltage transformer to the plug-in. Also, the counter 56 is incremented by 1. Then, the process proceeds to step 9, where the number of sheets lost due to jams is subtracted from the number of sheets copied so far when a large number of sheets are continuously copied. Note that the continuous copying proceeds from step 7 to step 3. Further, the number of copies is stored by incrementing the address b of the RAM by 1 each time the transfer paper feed signal is output in step 3. The subtracted number is also stored again at address b.

In step 5, the remaining copying cycles are performed as described above and the process proceeds to step 6. The jam flag is determined to be 1 and the process proceeds to step 10. In other words, the subsequent copy cycle is not executed regardless of the number of sets.

In this step, a routine is performed to determine whether the main switch or door switch is turned off. Since it is currently on, NC of switch 41 that responds to the door switch, main switch SW ₁
port 3 of the computer 58 via contact a of
is grounded. Therefore, the signal OFS is 0. Therefore, the control unit 58 performs the jam routine I in step 11, and outputs SJ ₁ or SJ from the F port.
It outputs SJ ₂ and displays the door for paper removal depending on the jammed location as described above. Also, the set number of copies and the subtracted number of copies are displayed. door 201
Or if you open 202, door switch SW ₂ or
SW ₃ turns off, so step 10 is exited. In other words, since the switch 41 is turned off, the computer 58
The input port 3 of is set to 1, and this step is executed by determining this. At this time, the switches 42 and 44 are turned off, so the AC circuit power is cut off, but as mentioned above, the relay 50
DC power is maintained. Therefore, there is no chance of getting your hands caught in the conveyance system or getting an electric shock during jam processing, and the number of sheets can be displayed continuously during jam processing. Note that the display routines for displaying the number of set sheets and the number of copied sheets are inserted in steps 1, 3, 5, and 11, and are not specially illustrated. The number display routine is a well-known program step for segment display. In step 12, it is determined whether the reset switch 59 has been returned to the NC side. After removing the paper, when the reset switch 59 is turned back on, the computer 58 port A
Since 1 is input as JRES, it is determined and the process proceeds to step 13, where it is determined whether the main switch and door switch are turned on. After turning on the reset switch, close the door and turn on main switch SW ₁ to exit this step and proceed to step 14. Here, the previously set jam flag is reset, and the output latches of the jam signal I and the jam relay signal J are released. Therefore, the relay 50 is reset and the drive path of the DC power sources 54 and 55 is switched from the plug 40 to the AC charge circuit line. Also reset the jam solenoid 57.

Step 15 is for determining whether the number of sheets matches, similar to step 7, and if there is a match, the process returns to step 1. If continuous copying is in progress, the process advances to step 16 and waits for the copy button to be turned on. During this time, the display routine of step 17 is executed to display the copying machine and the initial set number of sheets subtracted after the paper jam. When the copy button is turned on, the process goes to step 3 again and copies the remaining number of sheets.

The jam counter 56 is used to store the cumulative number of paper jams, and is used as data for calculating fees and examining the reliability of the apparatus by service personnel. The steps for turning off the control DC power supply when the paper jam is not cleared for 5 minutes after the door is opened after a jam occurs will be explained.

Do not close both doors in step 13.
If you do not turn on the main switch, proceed to step 18.
Then, the computer 58 outputs the pulse signal TIM from port A 4 to start the timer operation of the timer 60. Step 1 until time is up
Execute the display routine 1 and continue to display the jam location and number of jams during jam processing.

If the reset switch is not turned on and all door switches are not turned on, jam relay signal J will occur after 5 minutes.
The latch is stopped, relay 50 is turned off, and the low voltage transformer is cut off. This makes it possible to stop the continuous supply of excess power when the paper jam is being cleared and left unused for a while.

Since the process is controlled by detecting the states of the door switch and main switch, various controls can be performed before the switch is turned on.

FIG. 8 is an example of a flowchart shown in word mode when the flow shown in FIG. 5 is executed using a microcomputer μPD547 (manufactured by NEC Corporation). To explain briefly, DP _H and DP _L in the figure are memory
This register is called a data pointer and is present in the CPU for specifying the area of RAM (Fig. 4) and the input/output port of the CPU. CP ₁ ~ CP ₃ Set is
Indicates that the timer time for executing timer operations within the CPU is set in RAM. The machine word for each step in this flow is ROM
is stored in the ROM and is sequentially stored in the ROM when the CPU power supply
is read and executed from the initial address. After turning on the power switch and executing key entry, etc., set the data pointer to 0, 0 (1-1), specify port A (1-1), and determine whether the 3rd bit of that port is 1 or not. (1-3) Detects the status of each door and main switch, and when the bit is 0, determines whether the first bit of port A is 1 or not. (2) Detects the copy button on and selects that bit. When is 1, proceed to the copy cycle. Set 0, 4 in the data pointer (3-1), specify port E, 1 to 3
Set the bit to 1 and turn on the main motor, heater, and high voltage transformer by outputting 1 from ports E(1) to E(3) (3-2). The data pointer is set to 0 or 1, port B is designated (3-3), and the third bit is determined to detect whether the drum cam is turned on. Then, in the same manner as above, 1 is output from ports E(4) and F(3) to turn on the paper feed roller and forward clutch exposure lamp (3-5, 3-6). At this time, the number of copies in the RAM is incremented by 1 in the counter (3-7), and upon detecting that the cam switch is turned off, the paper feed roller is turned off (3-9). When the micro switch installed at the end of the optical system path turns on the cam installed in the optical system, the exposure is stopped and the reciprocating clutch is turned on (3-
12). Set the time CP ₁ for the jam timer, the back clutch, and the time CP ₂ for turning off the high voltage transformer (4-1) When the jam timer expires and there is no paper in SW ₄ , output to display the jam location (4 -3), when there is paper in SW ₄ , set port F(2) where there is no paper in SW ₅ and display it (4-5).
Then, set the jam output I, J jam, and flag, and subtract 1 from the previously counted up copy number.
(9). After that, the timer is set as when you are not jamming.
Check the completion of the CP ₂ timer and turn off the clutch and transformer (5-1, 5-2). If the copy counter is not jammed and the copy counter is equal to the set counter (7-1), timer C3 is set and after the timer is completed, the drum and heater are stopped (7-2).
In the case of jam, stop the drum etc. in the same way (3-
23), as in step 1-2, specify port A (3-24), determine whether the 3rd bit of that port is 1 or not (3-25), and set the door and main switches. When the state is detected and the bit is 1, that is, the main switch or door switch is off, it is determined whether the second bit of the same port is 1 (3-29), and if the bit is not 1, it is 5. minute timer
Set and check CP ₄ (3-26 to 3-
28). Also, if the 2nd bit of port A is 1 within 5 minutes, that is, the reset button is pressed, it is determined whether the 3rd bit of the same port is 1 (3-30),
If the bit is 1, that is, the door and main switches are on, the jam is released and the process can be restarted (3-31 to 3-33).

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view of a copying apparatus applicable to the present invention, FIG. 2 is a perspective view of FIG. 1, FIG. 3 is an example of a control circuit in the present invention, and FIG. 4 is a partial circuit diagram of FIG. 3. , Figure 5 is a flow diagram of the control steps, and Figure 6 is a flow diagram of the control steps.
7 is a memory area diagram, and FIGS. 8-1 and 8-2 are other flowcharts of the control steps.
1, 42, and 44 are door switches, SW ₁ is a main switch, 58 is a control circuit, and 60 is a timer.

Claims (1)

[Scope of Claims] 1. A process means for recording an image, a first switch for applying power to the apparatus for recording the image, and a first detection means for detecting trouble in the apparatus for recording the image. , a second detection means for detecting the state of the first switch; a second switch for making it possible to restart the image recording operation after the troubled state is resolved; and inputting data necessary for image recording. means, a memory storing a program for controlling the process means based on input data from the input means, and a plurality of input ports, and when a trouble is detected by the first detection means, the process and a computer that interrupts the operation of the means, and when a trouble is detected by the first detection means, the computer maintains power to the computer even if the first switch is turned off, and the computer maintains power to the computer even if the first switch is turned off. inputting the output of the second switch to a predetermined input port among the plurality of input ports of the computer, inputting the output of the second switch to the same predetermined input port, and specifying the predetermined port by the program. and means for determining the states of the first and second switches by checking bits corresponding to the first and second switches of the port; An image recording apparatus characterized in that a determination that the switch is turned on is a condition for restarting the operation of the process means.