JPH0222382B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an image forming apparatus such as a copying machine having various display functions. Conventional copiers detect and display problems within the machine, but a separate LED or other device is installed on the operation panel for this purpose, so the detection of abnormalities is limited to the minimum necessary. Otherwise, it was a complicated system that involved arranging a large number of LEDs to monitor abnormalities. The present invention has been made in view of the above points, and an object of the present invention is to provide an image forming apparatus that can simplify the apparatus configuration and display error states at a plurality of locations within the apparatus without unnecessary operations. That is, the present invention provides a process input means for setting various data for image formation, a process means for forming an image on a recording medium based on the data set by the input means, and a process means for detecting an error state of the apparatus. a plurality of detection means for detecting an error state of the device; and when an error state of the device is detected by the plurality of detection means, an error signal indicating that the device is in the error state is set; a first storage means in which the error signal is reset; a second storage means having a storage area corresponding to each of the plurality of detection means; and a common display means capable of displaying detection results by the plurality of detection means. and a control means that inputs the detection outputs of the plurality of detection means and causes the common display means to output a signal indicating an error state of the apparatus based on the detection results of the detection means, and the control means designation means for designating each of the plurality of detection means; storage means for storing the detection results of the detection means designated by the designation means in a storage area corresponding to the designated detection means of the second storage means; , reading means for reading out the detection results of the plurality of detection means stored in each storage area of the second storage means on the condition that the error signal is set in the first storage means; and the reading means When the detection result read out by the reading means does not indicate an error state of the device, the reading means is controlled so as to move to the next storage area to read the next detection result, and the detection result read out by the reading means When indicates an error state of the device, the reading means drives and controls the display means to display a display according to the type of error for a certain period of time, and moves to the next storage area to read the next detection result. and a display control means for controlling the plurality of detection means, the common display means automatically displays the types of errors detected by the plurality of detection means in sequence, and the error signal is set in the first storage means. The present invention provides an image forming apparatus characterized in that the common display means repeatedly displays the types of errors in sequence during the image forming process. This will be explained below with reference to the drawings. FIG. 1 is a schematic sectional view of an example of a copying machine to which the present invention is applicable. This is a copying machine that is equipped with a separate sorter outlet so that it can use a reduction mechanism and a sorter, and for high-speed, large-volume copying, the amount of paper that can be stored in the paper feed section is 50% smaller than that of a normal copying machine. It had a deck about twice as large as a conventional one, and also had a regular cassette, making it possible to feed paper mainly from the former. In addition, when copying a specified number of copies for each original,
In order to eliminate the trouble of distributing copies into predetermined numbers after copying, a so-called sorter is used in a copying machine, which automatically performs the distributing work. A variable magnification mechanism is also used to reduce the original image in three stages to obtain a duplicate image. In the figure, 1 is a photosensitive screen (for example, detailed in Published Patent No. 19455 published in 1975), 2 is a primary corona charger, 3 is a secondary corona charger, 4 is a lamp, 5 is a manuscript table, and 6 is a modulator. Corona charger, 7 is an insulated drum, 8 is a developer, 9 is a roller that feeds the transfer paper 10, 11 is a transfer charger, 12 is a conveyor belt, 13
is a fixing roller, 14 is a tray, 18 is a sorter, 2
0 is a pin. The original on the original platen 5 is moved to the lamp 4,
Slit exposure is carried out while moving the mirror 15, and a rotating so-called three-layer screen 1 previously charged with a primary charger 2 is exposed simultaneously with a secondary charger to form an electrostatic latent image. The primary latent image is used to form a secondary electrostatic latent image on the surface of the insulating drum 7 by the modulation charger 6, and the secondary image is developed with toner by the developer 8. The toner image is transferred to the transfer paper 10 fed from the cassette 52 or lift deck 53 by the charger 1.
1 conveys the transferred paper 10, fixes the toner image by a heat roller fixing device 13, and discharges the toner image onto a sorter 18 or a tray 14. Even after the secondary latent image is formed, the primary latent image does not disappear, so the screen 1 is further rotated and the charger 6 continuously forms the secondary latent image, and the transfer paper is sent one after another to the transfer section, where it is transferred and fixed. , the discharge continues a set number of times. When the number of repeated secondary latent images formed by one primary latent image is exceeded, the primary latent image is formed again. In addition, 16 is a lamp for removing static electricity from the screen, 17
-1 is a cleaning unit for removing toner from the insulating drum 7, and 17-2 is an AC corona discharger for removing residual charges from the insulating drum 7. FIG. 2 shows the operating section and display panel of the apparatus shown in FIG. SW in the figure is the process load of the copying machine, the main switch for turning on the power to the control circuit, 21
is the copy start key, 22 is the copy number setting key,
23-1 is a set number display, and 23-2 is a copy completion number display, each digit being displayed by a 7-segment LED. 24 is a tray, 25 is a sorter selection key, and the key itself lights up when the key is turned on to indicate whether the storage section is a sorter or a tray; 2
Reference numerals 6 and 27 indicate a cassette selection key and a deck selection key, which lights up to display selection when the key is turned on, and also displays the size of paper in the cassette and deck through 32. 28-1 to 28-3
is a key for selecting the light and shade, and it sets dark, medium, and light, and when the key is turned on, it lights up to indicate that. Reference numeral 29 is a stop key for interrupting the copying operation, and 30-1 to 30-3 are keys for specifying magnification, each of which is set to 1x, 0.76x, and 0.65x, and the corresponding location on the display 31 is lit. When a tray is selected, the belt 19 in FIG. 1 moves as shown by the dotted line so that the paper is ejected from the first ejection roller 50. When the sorter 18 is selected, the belt 19 is set so that the paper is discharged from the second discharge roller 51 as shown by the solid line. The deck 53 can store 2,000 to 3,000 sheets of paper, and the cassette 52 can store 500 to 1,000 sheets of paper. The paper sent to the sorter 18 is carried by a constantly rotating belt 55 and sent to a bin. Guide pawls a to i are provided for each bin, and each time the detector detects paper, the guide pawls are operated in order to direct the paper toward the bin and store it in each bin. That is, the solenoid SL2 is actuated by the key 25 to set the discharge port on the sorter 18 side as shown by the solid line, but if the copy key 21 is not turned on for a predetermined period of time (30 seconds) after this setting or if some key is not turned on, the automatic SL2 is then deactivated to return the discharge port to the tray 14 side. Also power switch SW
When turned on, the ejection port is set on the tray 14 in the same way when the ejection port is set to the sorter side and left for 30 seconds after copying is completed. Therefore, normal copying operations can be performed quickly without worrying about the ejection port. When one of the keys 28-1 to 28-3 is turned on, the amount of current supplied to the exposure lamp 4 is set to an amount corresponding to the specified density. But then I changed the copy key 21 to 30
If it is not turned on within seconds or if some key is not turned on, it automatically returns to the same light intensity as set with key 28-2. When the key 26 is turned on, only the paper feed roller 9 on the cassette 52 side is set to be operable.
27 is turned on, the roller 9 on the deck 53 side is set to be operable. However, if this roller is left alone for 30 seconds, it returns to the paper feed roller set of the deck 53 that stores A4 size paper, which is frequently used. When the magnification keys 30-1 to 30-3 are turned on, the position indicated by the lens and the mirror 15 provided in the optical axis of the image reflected by the lamp 4 are moved left and right using a motor and a solenoid in order to obtain a predetermined magnification image. and set it in place. But this also then 30
If it is left unattended for a second, it returns to the same magnification position as specified by pressing the key 30-1. Also, after repeatedly pressing the key 22 and setting the number of copies, the process returns to one copy in the same manner. After setting various condition modes in this way, the standard mode is returned to when 30 seconds have elapsed since the last setting operation. FIG. 3 shows a control circuit constituting an embodiment using a microcomputer. The ROM in the figure is a read-only memory in which the sequence contents of the display operation of key input data, the standard mode set operation, and the copying process operation are ordered in advance and stored in each address, and the contents can be retrieved each time an address is set. So, we use μPD454 manufactured by Nichidensha. RAM is a read/write memory that stores the number of copies and temporary control signals during process control, and is a memory that stores one set of binary codes. Using the same company's μPD462, a set of flip-flops is made up of multiple sets, and any set is selected by an address designation signal, and data can be written to or read from multiple flip-flops among them. . In FIG. 7-1, addresses of memories and their areas are shown, for example, in the X'043' format. The last 1 digit number indicates the column, the 2 digit number indicates the row, and the 3 digit number indicates the memory chip. Here, X'043' is an area for storing data on variable magnification, and this data contributes to designation of lens magnification and display operation of the display 31.
Also, X′033′ is the area to store the data specified by the scaling key.
The binary data of x′043′ is 0000, which becomes 1000 when multiplied by 0.7. x'062' is an area that stores 1000 when there is no paper in the specified paper feed section. Table 1 shall be followed for each data area below. Further, numerical data to be displayed on the segment displays 23-1 and 23-2 is stored in the SET and COPY areas, and key-input data is temporarily stored in x'018' and x'01c'. WA(0) is a three-digit working register used to run a timer that contributes to returning to standard mode, and WA(a) to WA(7) are registers that contribute to storing other temporary data. Table 2 shows the relationship between key input and stored data.

【table】

[Table] When there is no KEY input, F or 0000 is stored. I/O100 to I/O700 are input/output devices without paper.
Generates a signal for driving a data input signal such as a solenoid by a key or the like. I/O and its peripheral circuits are shown in FIGS. 4-1 to 4-5. The I/Os 100 to 600 are well-known ones including latch circuits and gate circuits, and μPD752 is used here. In I/O 100 in Figure 4-1, output port O is connected via a DC driver to the drive circuit of motor M ₁ that rotates the screen drum insulation drum, and is connected to a high voltage transformer for each corona discharge. . Input port _I0 connects the clock pulse CLK from the disk, which is the basis of the timing operation of the transformer and clutch, via a line receiver (input interface). Also, a switch linked to the main switch SW is connected to input port _I2 .
Connect SW ₁ as an input and contribute to determining the on/off state of SW. Further, port _I3 is connected to a circuit of a thermistor _Th1 that detects the temperature of the fixing heater, and contributes to determining the wait time up. In the I/O 200 of FIG. 4-2, O ₀ and O ₂ are connected to each variable magnification motor M ₃ and exit switching motor M ₂ , respectively, and the above M ₁
connected through a similar input circuit. O ₁ and O ₃ are connected to each magnification solenoid SL ₁ and outlet solenoid SL ₂ via the same input circuit as CL ₁ , and I ₁ to
I ₃ is the RD ₁ of the Hall element HIC installed in the lens system path,
It is connected to RD ₆ and RD ₇ (eg, 0.6, 0.7 times) like the input B port and contributes to the magnification set. In the I/O 300 in Figure 4-3, I ₀ and I ₁ are connected as described above to the TP and SP (tray, sorter) of the Hall element HIC provided at the exit to determine whether the output is a tray or a sorter, and Contributes to the set. O ₀
~ _O3 is the lamp _L1 ~ _L3 (medium, dark,
Light) L0.6, L0.7, L1.0 (0.6x,
0.7x, 1x). In the I/O 400 in Figure 4-4, O ₀ to _{O 3} are lamps L _S , L _T , L _D , for indicating the paper feed port and exit display.
Connected to L _P and L _C (each sorter, tray, deck, paperless, cassette). _I0 is connected to a switch that detects insertion of a key counter that counts the total number of copies. _I1 is connected to a well-known optical sensor that detects whether a cassette or deck is out of paper. 4-5 shows a KEY & DISPIAY I/O port 700 for inputting input signals from each key into the computer and driving a segment display. In the figure, MAT is a well-known matrix circuit whose intersections are energized when the key is turned on, T ₀ to _{T 5} are digit selections of the displays 23-1 and 23-2, time-division scan signals for scanning the matrix circuit, and KR ₀
~ _KR3 is a port for inputting a matrix signal due to key-on, and 100 to 106, 107 are driver circuits as shown in the figure, which are made of transistors. In MAT, "0", "1"..."9" are numerical keys, CL is clear key, COPY is copy start key, 1.0, 0.6,
0.7 is the magnification key, dark, medium, and light are the shading keys, DEC,
CAS, SP, and TP are deck, cassette, sorter, and tray specification keys. This device is a well-known device having a buffer register for key entry, a shift register for storing display data, a digit signal generator for displaying display data in a time-division manner, etc., and a μPD757 is used here. The CPU includes the above memory, one or more registers AC and PC for specifying addresses of input/output devices, one or more registers A, B, C, and D for primary storage, overflow bit OVF, and block CFT data signal lines. Control unit CT with addition/subtraction logic control to decipher input data and process data, arithmetic circuit
ALU, such arithmetic circuit ALU data decimal correction,
Has addition and exclusive OR functions. Note that the contents of register A can be rotated to the right (shifted to the right) or rotated to the left (shifted to the left). The CPU has the above circuits and is connected to the above external circuits through a plurality of lines. Briefly, the CPU first specifies the address of the ROM where the sequence is programmed, and then sends the contents of the specified address through the data signal line DB1.
It is read into the CPU, the CPU decodes it, and according to the decoded contents, it processes the data within the CPU itself in chronological order from power-on,
Sometimes data in the CPU is stored in a specified address in RAM, data in a specified address in RAM is input into the CPU, and sometimes data in the CPU is stored in the input/output section I/O. It performs sequence control by outputting to the signal line DB3 of O100 and inputting the contents on the signal line DB3 of the input/output section into the CPU. 5-1 and 5-2 are encoded in this order and stored in the memory ROM of FIG. 3. This is a flowchart showing the control program. When the sub power switch installed inside the main unit is turned on, the control unit including the CPU is powered on, the ROM program is leaked, and processing begins (STAT). In step 1, RAM4bit, 256 words, address X'000'~
Clear all data in X′0FF′. Then, it is determined whether the switch SW is on or not, and if it is on, step 2 is executed. This determination is based on the I/O port
This is to check whether the input port _I2 of chip 100 (Fig. 4-5) is 1 or not.The CPU specifies chip 100, takes the 4 bits of input data into the accumulator ACC, repeats the left shift, and sets the 1st bit to 1. This is done by determining whether or not it is set. In step 2, necessary data is first written into a predetermined location in the RAM in order to set the image forming conditions to the standard mode. The data contents are shown in Table 1.

[Table] In standard mode, the reduction is 1x, the exit is the tray, and the copy density is medium, so the RAM data is (X'043') is a number other than 0, (X'033 ^~ ) is 0,
(X′053′) is 0, (X′042′) is 2, (X′032′) is 2
It becomes a number other than Note that (X'043') is the data at address X'043'. Regarding step 3, the number of sheets of paper collected in the deck is four times that of the cassette (approximately 2000 sheets). Therefore, frequently used paper (for example, A4 size) is collected on a deck and normally fed from the deck. Here, first,
To select the deck as the standard mode, check whether there is paper on the deck. Sense I/O 400 and check paper detector 61. If you have paper, set the data on the deck to RAM. In other words, set (X'052') to 8
(3-1). When there is no paper in the deck, the cassette is selected, the paper detector 60 is checked to see if there is any paper in the cassette, and if there is no paper, the paper out lamp 33 is turned on, so (X'062') is set to 8 and there is paper. Then set it to 0 (3-3). If there is paper in the cassette, set X'052' to 0 to specify the cassette (3-3).
2). In step 4, in order to display the copy setting counter 23-1 as 1 and the copy number counter 23-2 as 0, the 100th position (X'03A') of the counter SET in RAM is set to 0, and the + position (X'03B') is set to 0. The 0th place (X'03C') is 1, and the hundredth place (X'04A') of the counter COPY is 0, the tens place (X'04B') is 0, and the first place (X'04C') is 0. Set to . In step 5, the RAM is
The data set in 4 bits are simultaneously output to the I/O port. Display data (X'022') is the result of adding (X'032') + (X'052') + (X'062') and output to I/O400. , deck, and cassette selection indicator lights. In standard mode, it is 6 or O ₀ ~
O ₃ outputs 0110 and the deck indicator lamp and tray indicator lamp light up. (X′023′) is (X′033′)+
(X′023′) is the content obtained by performing the operation of (X′053′).
By outputting to the I/O port of X'300', the equal-magnification lamp and medium-density lamp are turned on. Furthermore,
The RAM contents of X'02A' to X'02C' and X'03A' to X'03C' are output to Key & Display I/OX'700' address, and 001, Display 000. In step 6, the Key & I/O device
The key input at address X'700' is read. If no key is input, data XF' is entered at X'01C' and X'018'. If there is any input, the data is 1 o'clock.
The details of this, stored in RAMX'01C' and X'018', are shown in the flowchart of Figure 6-1. This flowchart is based on the μPD757 specification method, and each step corresponds to one step to be stored in the ROM. In step 7, the input data stored in step 6 is set at the necessary address in the RAM according to the contents. For example, when the key for magnification 0.7 is turned on, (X'01C') is 1, so bit 1 is set to (X'033') at 8, or 0.7. When the number key is 9, (X'018') is 9, so shift (X'02B') to X'02A', shift (X'02C') to X'02B',
Set 9 to X'02C'. At the same time as these settings are made, various modes are displayed in the same manner as in step 5. In Step 8, the paper feed section set in Steps 6 and 7 is determined by (X'052'), that is, 0 indicates the cassette, 4 indicates the deck, and the status of the paper detectors 60 and 61 of each section is determined. Check. 60,
Reference numeral 61 is a Cds that detects changes in light reflected by paper, and when there is no reflection, it is assumed that there is no paper. Then, as in step 3, the paperless lamp is turned on or off. In step 9, it is determined whether or not the positions of the lens system and mirror system correspond to designated positions.If they are not at the designated positions, the positions are changed (FIG. 5-2). Regarding step 16, the data in the RAM from step 7 and the data from the I port of the I/O 200 are compared. In other words, (X′033′) and (X′043′) of RAM
Determine whether they are equal or not. If we now specify 0.7x and the lens system position is 0.7, then (X'033') is 1000 and (X'043') is 1000, which are equal.
When the lens system position is equal to the same magnification, _I2 of I/O200 is 0
Therefore, (X′043′) is 0000 and they are not equal, so the lens position is changed. First, the variable magnification motor
Turn on _M3 and turn on solenoid _SL3 for rotation lock to move the optical system. When the magnet attached to the lens reaches the position of sensor RD7, I/O200's I ₂
becomes 1, so motor M ₃ and solenoid SL ₁ are turned off. Also, set the data to X'043'. In step 10, when the lens system is at the specified magnification change position, the state of the power switch SW is determined to see if the control should be restarted. This is done by sensing port _I2 of I/O100. When SW is off, return to start and clear RAM. In step 11, it is determined whether the paper exit position is at the specified position. When the exit is not in the designated position, the exit is changed (Figure 5-2). In step 18,
The RAM data (X'032') obtained in step 7 is compared with the data (X'042') obtained from the I port of the I/O 300. When (X′032′) and (X′042′) are equal, that is, it is a tray specification, and if there is something in the tray, (X′032′) is 0010 and (X′042′) are 0010, which are equal, but When '042' is a sorter of 0001, they are not equal, so change the output. First, the outlet motor M ₂ and rotary lock solenoid SL ₂ are turned on to move the outlet from the sorter toward the tray. When the magnet provided on the fixed shaft approaches the rotation of the roller of the belt 19 and the tray sensor 70 is turned on, 1 is input to the port _I0 of the I/O 300 to determine that the tray position has been reached. Then turn on motor _M2 solenoid _SL2 and set data to RAM X'042'. In step 12, it is determined whether a key counter is inserted or not, and whether or not the device has waited up (completed), based on the I/O 100 designation and sense, and it is checked whether copying is possible. When copying is possible, exit, and after changing the magnification position, proceed to step 20.
The program proceeds to a step to set a 30 second standby timer, and through this step, a routine to check for key input, a paper out check, and an exit magnification position check routine are performed again. Step 13 is to determine whether or not the copy key 21 has been entered.
Perform data discrimination. If there is no copy key input, proceed to step 14 and check whether another key is inserted (X'018'),
Control is performed by checking whether (X'01C') is F or not. If there is still no evidence of any key input, proceed to step 15. If the routine up to this point is repeated about 3000 times, that is, the steps up to this point are about 1000 and each step is about 10 μsec, so 30 seconds will pass. Therefore, 30000 is stored in RAM WA (0) (step 20), and each time step 15 is executed, this is decremented by 1 (15-1). When it becomes 0, the process advances to the initial step STAT. Clear RAM and set standard mode (step 2). In step 14, if a key entry is made during this 30 seconds, step 20 is executed again and the 30 seconds are saved in the RAM.
is stored in WA(0), and the above subtraction routine is performed. Details of steps 14 and 15 are shown in FIG. 6-2. If the copy key is turned on during this time, the process proceeds to step 21, where the drum motor _M1 high voltage transformer is turned on and the copying operation is started. If a jam occurs during copying or if the paper in the deck or cassette runs out, the motor M ₁ and the high voltage transformer are turned off, but the process does not exit from step 21. Therefore,
RAM data is held and the number of sheets etc. is displayed only when the power is turned off.
It persists even if the SW is turned off. The RAM counter COPY is increased by 1 every time one copy cycle is completed (every time paper is fed).
The value is displayed on the display 23-2, and the counter
Compare SET with that and if they match, turn off the main motor M ₁ and high voltage transformer. Then proceed to step 20 and set a timer of 30 seconds. _M1
The timing to turn off and exit step 21 is
This is after the last paper has passed through paper detectors 64 and 65. Also, even if you turn on the clear key when there is no jam or paper, this step 21 is skipped and the setting is set for 30 seconds. After setting for this 30 seconds, if you do not want to enter the copy key or other keys, or if you have made a key entry and do not want to enter the next key, return to the STAT step and return to the standard mode. If you turn on the copy key within this 30 seconds, copying will be performed using the previous set number. In Figure 6-2, microstep 14-
1 to 14-4, the data of X'018', that is, the same size,
0.7, 0.6, gray key, clear, cassette, deck, sorter, tray key input is determined, but 1
In step 4-3, the exclusive OR of the data stored in ACC and AC is performed and the result is stored in ACC, and if there is a match at F, ACC becomes 0. Therefore, 14-5 to 14-
Execute step 8 and similarly determine the data of X'01C' and look at the numerical keys. Microsteps 15-1 to 15
-3 indicates X'001' to X'003' as a 3-digit working register with WA (0), but this value is -1 and
The value is stored in WA(0) again. 15-4～
15-6 is whether the upper digit of WA(0) is 0 or not, 15
-7~15-9, 15-10~15-12 is WA
It determines whether the middle and lower digits of (0) are 0 or not and returns to the start. FIG. 8-1 shows a variable magnification mechanism, in which a lens system 59 and a mirror 15 are reciprocated by rotation of a motor _M3 . Also, the positions of the lens 59 and mirror 15 are set according to the zoom specification, depending on the sensor RD1, RD7, RD6.
They move in conjunction so that a predetermined optical path length is achieved when the position is .
SL ₃ turns off when the optical system is in place and locks it from moving. Figure 9-1 is a time chart when moving from 1x to 0.6x. When the key is turned on, the RAM
Since (X′033′) is 4 and (X′043′) is 0, I/
Set O of O200 to 3 and turn on SL ₃ and M ₃ .
I of I/O200 is Hall element RD1, RD7, RD6
By determining that 8 = I ₃ = 1),
Turn off SL ₃ and M ₃ . Then set 4 to X'043'. FIG. 8-2 shows the exit changing mechanism, in which the belt 19 is moved up and down by the rotation of the motor _M2 .
The position of the belt 19 is determined by the sensor 7 according to the exit designation.
When 0,71 is on, it moves to a predetermined exit.
SL ₂ turns off and locks the outlet from movement when it is in place. No. 9-2 is a time chart when moving from the tray to the sorter. When the key is turned on, RAM (X'032') is set, and since (X'042') is different from that, I/O200 O is set and SL ₂ and M ₂ are turned on.
As described above, the signals from the sensors 70 and 71
SL ₂ and M ₂ are turned off and set at a predetermined exit. As described above, the conditions corresponding to various key inputs are displayed, and if the process does not start within a predetermined time after the last key input, the display is cleared or the standard mode is displayed, which reduces image formation errors and speeds up the process. Image formation can be expected to resume. Figure 10 shows jam determination step 2 in Figure 5-1.
This is a flowchart showing steps 1-3 in detail. In step 31, a jam caused by a paper jam or the like in the paper path is detected. The jams are the paper sensors 62 to 67 in the copying machine and the paper sensor 6 in the sorter shown in Fig. 1.
8 and 69 (sensors 66 to 69 are not shown), the sensor is sensed at a predetermined timing to determine whether or not the paper has arrived at the appropriate time. Each sensor outputs a signal 1 when a well-known optical detector detects paper. 62 is a paper feeding section, 63 is a conveyance section, and 64 and 65 are sensors for a discharge section. If 1 is not sensed at a predetermined time, it is determined that there is a jam, and the process proceeds to step 32, where it is checked whether a reset button (not shown) in the main body is turned on to clear the jam. When it is on, the process advances to step 33, and the sensors 62 to 69 are scanned again to check whether there is still paper left. If it remains (Step 3)
4) Set an error flag in RAM as an error mode and display F-P on the segment display 23-1 for setting the number of copies (Step 3).
5). In steps 33 to 35, the paper is checked and displayed in the order of location from the sensor 62. When paper is detected by the sensors 62 and 63, the segment display 23-2 for copy count indicates E.
-1 and E-2 are displayed alternately. This routine corresponds to steps 11-5 to 11-7 in FIG. 11. Data is set in the area of the display operation RAM corresponding to the sensor where paper remains, and while the error flag is set, that area is scanned and displayed. When the paper is removed, the same key input as in step 6 becomes possible (step 36), and when the copy key is turned on, the number of copies and the number of sets are compared in step 21-4, and the process moves to completion or re-copying. If you turn on the clear key when the copy key is not turned on, the program will proceed to step 20, standby set, and data input by key will be stored.
Can be stored in RAM. In other words, the previously stored scaling data, numerical data, etc. are canceled and new data can be set. However, data cannot be set while the SW is on and the clear key is not turned on. However, if the SW is turned off, the 5-1
Return to step STAT in the figure, clear the RAM, and wait. In this way, even if a jam is reset after a jam occurs, there is no need to clear a large number of image forming condition modes, and all are held, so there is no need to take the trouble of resetting the conditions. 11-1 and 11-2 show a diagnostic flow between steps 11 and 12 in FIG. 5-1. That is, after turning on the power switch, it detects and displays whether paper remains in the paper sensor in the paper path, detects and displays a break in the temperature control thermistor of the fuser, and displays whether the side plate of the sorter is closed. It is possible to avoid an increase in trouble by detecting and displaying the information and checking in advance the parts that are not usually checked before copying can be started. At step 11-1 in the figure, the paper sensors 62 to 62 are
67 is scanned and sensed, and the data of each sensor is stored in a register. First, it is determined whether or not there is paper in the sensor 62, and if there is paper, data is set in X081 of the RAM, and an error flag is set in X080 (11-3). Next, the presence or absence of paper is determined by other sensors and similar operations are performed (11-4).
After detecting the presence of paper in the tray side discharge detection sensor 64 and the sorter side discharge detection sensor 65 and setting error flags, etc., check the operational amplifier (not shown) that outputs 11 due to a disconnection of the thermistor (11-5). ). When it is 1, the data is set in X091 of RAM and the error flag is set in X080. Similarly, the sensor for detecting the disappearance of the cleaner web in the cleaning section is checked, and if no web is detected, the data is stored in the RAM and an error flag is set (11-6). When a sorter is selected as an exit, it is checked whether the side plate of the sorter is open by turning off the door switch (11-7). After that, a jam detection sensor 68 installed at the sorter inlet
(not shown), and a sensor 69 provided on the sorter tray
Sense whether there is paper (not shown) (11-9)
Performs storage work in RAM. Then, the set state of the error flag in the RAM is sensed, and when the error flag is set, the error mode is displayed on the segment displays 23-1 and 23-2 as described above.
(11-10). This step is similar to step 35 in FIG. 10 and will be described in detail later. Then repeat these routines. If the error flag is not set or if the flag is cleared by removing the paper on the sensor, the segment displays 23-1 and 23-2 display the number of copy sets stored in the RAM SET, COPY area, and the number of completed copies. Then go to step 12. In FIG. 1, the output of a well-known optical sensor 73 (not shown) which detects the end of the web to be cleaned beforehand on the insulating drum 7 and indicates that there is no web is inputted to _I0 of the I/O 500. Alternatively, the output of a micro switch 74 (not shown) that is turned on when the side plate of the sorter (opened and closed to take out paper) is completely closed is input to _I2 of the I/O 300. Further, 68 is a sensor (not shown) for detecting whether paper is jammed near the sorter entrance, and 69 is a well-known optical sensor (not shown) for detecting whether paper is jammed at each sorter. The output is similarly input to _I3 of I/O300. Jam detection paper detection sensors 62 to 67 in the copying machine path are I0 to _I3 of I/O500 and I/O600 _.
The thermistor disconnection detection signal is input to _I3 of I/O400. The signals from each of the above sensors serve as conditions for display control as described above. Next, the error display operation (step 35) is performed in the 12th step.
This will be explained using figures. The keys and display chip μPD757 used in the I/O 700 have a relationship between 4-bit hexadecimal code input and segment display as shown in Table 3.

[Table] Also, the relationship between error contents and segment display is as follows: 23-1,
23-2 is displayed as FP, E-1. Here, F on the display 23-1 means that the diagnostic program is being executed, and P on the right digit means that the diagnostic mode is jammed. E on the display 23-2 means an error symbol displayed when an abnormality is detected, and the digit 1 to the right of the blank indicates the location of the abnormality. 23-1 and 23-2 are displayed simultaneously. Therefore, corresponding to the paper sensors 62 to 69, E-
1 to E-8, web check sensor 73, sorter switch 74, and thermistor disconnection check sensor, E-9, E-10, and E-11 are displayed. If an abnormality occurs at multiple locations during jam or standby, for example, during standby, if sensor 63 and sensor 73 are abnormal, the display 23-1 will indicate F-0,
At step 23-2, E-2 and E-9 are displayed alternately. This operation will be explained using RAM with reference to FIGS. 7 and 12. When proceeding to the error display, the CPU performs the following step processing. In step 35-1, write hexadecimal code XA to RAM address X0D3.
(BOD1010). This is I/O-
When decoded by the X700, it becomes E as a 7-segment display, and if this is output (displayed), it means that there is an abnormality in the diagnostic result. In step 35-2, set the hexadecimal code to X0D4.
Set up XF (BCD1111). This is KEY&
When decoded by the DisPlay I/O-X700, it becomes blank. Next, X081 is specified as the RAM address and the process proceeds to step 35-3. In step 35-3, if the content of the RAM address specified in the previous step is 0,
Jump to D0 and set the specified RAM address +
1, that is, in the case of X081, set it as X082 and the lower part of the address
Until the 4bit value becomes hexadecimal XA (BCD1010)
Repeat Step 35-3. Here, if a value other than 0 is set at the specified address in RAM, the mode in which an abnormality was discovered as a result of the diagnosis in the previous step will be displayed.
The lower value of that address, i.e. 2 for X082
is set to X0D5, and data from X0D5 to X0D0 is sequentially output and displayed on I/O-X700. and about
Hold the display for 11 seconds, proceed to D0, and do the same.
The lower part of the specified RAM address is hexadecimal XA
Repeat until (BCD1010) is reached. In other words, the display of steps 35-2 and 35-3 is
The error modes set at RAM addresses X081 to X089 are displayed sequentially at one-second intervals. For example, when there is paper in the sensor 62 in the standby diagnostic mode, the display data is changed to F, -, 0 in response to the digit switching timing signal T ₀ , T ₁ , T ₂ , T ₃ , T ₄ , T ₅ of the I/O 700. , E, blank, 1. Steps 35-4 to 35-6 are the same as in step 35-2, from each RAM address X090 to X099, and from X0A0.
The error mode data set in X0A9, X0B0 to X0B9, and X0C0 to X0C9 is displayed sequentially at 1 second intervals. Note that since no data is stored in X0A1 to X0C9, the display is blank. As explained above, according to the present invention, error states at multiple locations within the device can be automatically and repeatedly displayed sequentially and repeatedly until the error state is cleared using a common display means, which simplifies the device configuration. At the same time, the error state of the device can be easily and reliably notified to the operator without complicated operations.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the image forming apparatus according to the present invention, FIG. 2 is a plan view of the operating section in FIG. 1, FIG. 3 is a control circuit diagram in FIG. 1, and FIGS. 4-1 to 4-5. is the input/output circuit diagram in Figure 3, Figures 5-1 and 5-2 are control flowcharts, and Figures 6-1 and 6-2 are Figures 5-1 and 5-2. 7-1 and 7-2 are memory diagrams of FIG. 3, FIGS. 8-1 and 8-2 are partial sectional views of FIG. 1, and FIG. 9-1 , Figure 9-2 shows each Figure 8-1.
Fig. 8-2 Operation time chart, No. 10
11-1, 11-2, and 12 are other control flowcharts, in which 14 is a tray, 18 is a sorter, 52 is a cassette, 53 is a deck, and 9 is a paper feed roller. , 59 is a lens system, 21 is a copy key, 22 is a number key, 28-1 to 28-3 are gray keys, 24, 25 are exit designation keys, 26, 2
Reference numeral 7 designates a paper feed section designation key, and 30-1 to 30-3 designate magnification change designation keys.

Claims (1)

[Scope of Claims] 1. A process input means for setting various data for image formation, a process means for forming an image on a recording medium based on the data set by the input means, and a process means for detecting an error state of the apparatus. a plurality of detection means for detecting; and when an error state of the device is detected by the plurality of detection means, an error signal indicating that the device is in the error state is set; and upon release of the error state of the device; a first storage means in which the error signal is reset, a second storage means having a storage area corresponding to each of the plurality of detection means, and a common display capable of displaying detection results by the plurality of detection means. and a control means for inputting the detection outputs of the plurality of detection means and causing the common display means to output a signal indicating an error state of the apparatus based on the detection results of the detection means, the control means designation means for designating each of the plurality of detection means; storage means for storing the detection results of the detection means designated by the designation means in a storage area corresponding to the designated detection means of the second storage means; a readout means for reading out the detection results of the plurality of detection means stored in each storage area of the second storage means on the condition that the error signal is set in the first storage means; When the detection result read by the reading means does not indicate an error state of the device, the reading means is controlled so that the detection result read by the reading means moves to the next storage area to read the next detection result. When the result indicates an error state of the device, the display means is driven and controlled to display a display according to the type of error for a certain period of time, and the readout means is moved to the next storage area to read out the next detection result. and a display control means for controlling the plurality of detecting means, the common display means automatically displaying the types of errors detected by the plurality of detecting means sequentially at fixed time intervals, and further comprising: An image forming apparatus characterized in that while an error signal is set, the common display means repeatedly displays the types of errors in sequence.