JPS61246769A - Image forming device - Google Patents

Abstract

PURPOSE:To simplify a display part and to reduce the cost of the device by forming a selecting means of a check mode for checking the abnormality of the device and displaying the abnormality by using a display means for image forming information. CONSTITUTION:An original is set up on an original platen 5 and scanned by a scanning optical system 4 and an electrostatic latent image is formed on a photosensitive screen 1. Then, the electrostatic latent image is formed on an insulating drum 7, developed by a developing part 8, transferred to paper by a transfer part 11, and fixed by a fixing roller 13 and the copy is sent to a tray 14 and a sorter 18. In this case, the check mode is selected to detect the abnormality of the device and respective keys of copy number indicating keys are depressed to selectively check the abnormality of a motor, a high voltage transformer, a jam, an optical system, an outlet position, the rotation of the drum, etc. If any abnormality is detected, the abnormality is displayed by a display unit for displaying the final number of copies. Since the abnormality is displayed by using the display unit for executing specific display, various kinds of abnormality can be displayed and alarmed by the small number of display units and the device can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image forming apparatus such as a copying machine having various display functions.

Conventionally, copiers detect and display internal troubles, but in order to detect and display them, separate diagnostic command switches, LEDs, etc. are installed on the operation section, so the number of abnormality detection targets is kept to the minimum necessary. Although it is limited to
Since a large number of LEDs and switches are arranged side by side to monitor abnormalities, the operation section and display section become complicated and the cost increases.

The present invention has been made in view of the above points, and utilizes the display means for displaying information related to image formation to reduce the cost and cost of the apparatus, and when the check mode for checking abnormalities in the apparatus is selected, An object of the present invention is to provide an image forming apparatus in which it is possible to easily recognize what mode the apparatus is currently in by driving and controlling the display means in a display form different from the display form of information related to image formation. .

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 equipped with a separate outlet for the sorter so that it can be used with 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 five times that of ordinary copying machines. On the other hand, it had a normal cassette, making it possible to feed paper mainly from the former.

Furthermore, when copying a predetermined number of copies for each original, a so-called sorter is used in the copying machine, which automatically performs the distribution work to eliminate the trouble of distributing the copies into a predetermined number of copies after copying.

In addition, a variable magnification mechanism is 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 of 1975), 2 is a primary corona charger,
3 is a secondary corona charger, 4 is a lamp, 5 is a document table, 6 is a modulation corona charger, 7 is an insulated drum, 8 is a developer, 9 is a transfer paper, 10 is a paper feeding roller, 11 is a transfer charger vessel, 1
2 is a conveyor belt, 13 is a fixing roller, 14 is a tray, 1
8 is a sorter, and 20 is a 10-piece bin. The document on the document table 5 is subjected to slit exposure while moving the lamp 4 and the mirror 15, and the rotating so-called three-layer screen 1, which has been previously charged with the primary charger 2, is exposed simultaneously with the secondary charger and is statically exposed. Forms an electrolatent image. A secondary electrostatic latent image is formed 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 a transfer paper 10 fed from a cassette 52 or a lift deck 53 by a charger 11, fixed by a heat roller fixing device 13, and discharged 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 l 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. , Ejection is continued by the number of sets (repeatedly). When the number of repetitions exceeds the number of secondary latent images formed by one primary latent image, a primary latent image is formed again.

In addition, 16 is a lamp that removes static electricity from the screen, 17-i is a cleaning unit that removes toner from the insulating drum 7, and 17-i is a cleaning unit that removes toner from the insulating drum 7.
2 is an AC corona discharger for removing residual charges from the insulating drum 7.

Note that the paper fed by the paper feed roller 9 stops at the position of the register roller 35. Thereafter, by operating the register roller 35 at a predetermined timing (in response to a registration signal from the switch 83), the paper is conveyed to the transfer section so as to match the toner image on the drum.

With this device, the secondary latent image can be repeatedly formed independently of the primary latent image formation, so the rotational speed of the screen and insulating drums can be adjusted to be faster than when forming the secondary latent image. can do.

In FIG. 1-1, reference numerals 84 to 85 refer to a bus in which the optical systems 4 and 15 move back and forth for exposure scanning.
It is a Hall element that turns on when a magnet (from the lamp) passes or arrives at that location. 84 is a home position signal indicating the start of exposure or the optical system stop position when turned on; 185 is a reversal signal for turning off the lamp 4 at the end of exposure and moving the optical system backward; and 86 is for operating the registration roller 35. Generates a registration signal for 81
82 is a microswitch that generates a position signal for stopping the screen drum 1 and is operated by a cam provided on the drum 1, and 82 is a microswitch that generates a clock pulse KCL synchronized with the rotation of the screen drum 1. This is a low-resolution encoder that has a photo-incrementor that detects discs and disc holes.The CPU counts KCL to determine various process timings and outputs check pulses for jam detection. Reference numerals 86 to 88 denote Hall elements HIC for detecting the lens position for reduction of the same size, 0.7 times, and 0.6 times, which are turned on by passage of a magnet linked to lens movement.

FIG. 2 shows the operating section and display panel of the apparatus shown in FIG. In the figure, SW 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, 2
2 is the copy number setting key, 23-1 is the set number display,
23-2, each digit has 7 segments of L on the copy completion number display.
Displayed by ED. 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. 26.27 is a cassette selection key, a deck selection key, and When the key is turned on, it lights up to display the selection, and then the cassette,
The paper size in the deck is also displayed by 32. 28
-1 to 28-3 are keys for selecting shades, each shade,
When you press the key to set medium or light, it lights up to indicate that. Reference numeral 29 is a stop key for interrupting the copy operation, and keys 30-1 to 30-3 are keys for specifying magnification. Light up the area. Note that the cassette stage designation and the variable size specification are independent of each other, and variable size copying is possible regardless of the paper size of the cassette.

When the 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 moves from the second ejection roller 51 as shown by the solid line. A belt 19 is set to eject the paper.

Note that 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 constantly rotated, carried by a belt 55, and sent to a bin. Guide pawls a to k are provided for each bin 20, and each time the detector 68 detects a paper, the guide pawls are activated in order to direct the paper toward the bin and store it in each bin. That is,
The key 25 activates the solenoid SL2 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 no key is turned on, the SL2 is deactivated and the ejection port is returned to the tray 14 side.Also, when the power switch SW is turned on and the ejection port is set to the sorter side and left for 30 seconds after copying is completed, the ejection port is set to the tray 14 in the same way. Therefore, normal copying operations can be performed quickly without worrying about the ejection port.

When any one of the keys 28-1 to 28-3 is turned on, the amount of electricity supplied to the exposure lamp 4 is set to an amount corresponding to the specified density. However, if the copy key 21 is not turned on within 30 seconds after that, or if some key is not turned on, the light intensity automatically returns to the same level as that set with the key 28-2.

Also, when the key 26 is turned on, the paper feed roller 9 on the cassette 52 side
When 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 variable magnification keys 30-1 to 30-3 are turned on, the position of the lens system installed in the optical axis of the image reflected by the lamp 4 and the mirror 15 are moved left and right using a motor and a solenoid in order to obtain a predetermined magnification image. and set it in place. However, if this is also left for 30 seconds, it will return to the same magnification position as specified by the key 30-1.

Also, after the number of copies is set repeatedly using the key 22, 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.

Further, 40 is a jam position indicator that indicates the location where a paper jam occurs in the apparatus.

Reference numerals 42 and 41 both indicate the occurrence of a paper jam, and in response to the operation of a jam detection sensor, which will be described later, display the path corresponding to the sensor in a blinking manner. Paper jams are displayed in the sorter shown in FIG. 1-2 and in the main body shown in FIG. 1-1, respectively. 48
44 is a display that indicates that there is no paper in the selected paper feed section; 43 is a display that indicates when it is necessary to contact a service person in the event of an abnormality in the apparatus; 46; 47 is a display indicating that the key counter is missing, and 47 is a wait display indicating that the apparatus is preparing for a copying operation.

FIG. 3 shows a control circuit constituting an embodiment using a microcomputer. The ROM shown in the figure is a read-only ROM in which the sequence contents of the display operation of key human data, the standard mode set operation, and the copying process operation are stored in advance in a sequential order, and are embedded in each address, and the contents can be retrieved each time an address is set. As the memory, μPD454 manufactured by 8 Densha is used. R.A.
M is a read/write memory for storing the number of copies and temporary control signals during process control, and is a memory for storing one set of binary codes. A μPD462 manufactured by the same company is used, which is composed of a plurality of sets, and an arbitrary set is selected by an address designation signal, and data is written to or read from a plurality of flip-flops among the sets.

In Figure 7-1, the address of the memory and its area is shown, for example, in the format of
The number of digits indicates the row, and the number of three digits indicates the memory chip.

Here, X"043' is an area for storing variable magnification data, and this data contributes to designation of lens magnification and display operation of the display 31.

Also, X' 033 ' is an area to store the data specified by the scaling key, and when it is the same size, X' 033 '
'.

X'043'+7) Binary data is oooo, which becomes 1000 when multiplied by 0.7. X"062" is an area where 1000 is stored when there is no paper in the designated paper feed section.

Table 1 shall be followed for each data area below. Numerical data to be displayed on the segment displays 23-1 and 23-2 is stored in the SET and C0PY areas, and data entered manually is temporarily stored in X'018' and X'01C'. WA(0) is a 3-digit working register for executing a timer that contributes to return to standard mode, and WA(a) to WA(7) are registers that contribute to storing other data. Table 2 shows the relationship between key human power and stored data.

Table 2 KEY (X'018') KEY (X'OIC
') 0 0 Same size key 0 1 1 0.7 12 2
0.6 23 3 Dark key 3 4 4 Medium
45 5 light
56 6 Clear 6 7 7 Copy key 7 8 8 Cassette 8 9 9 Deck 9 No key F Sorter A tray
B No key F When there is no KEY input, F or 0000 is stored.

110100 to 110N are input/output devices that input data input signals such as paper out and keys, and generate signals for driving solenoids and the like. Figure 4-1.4-11 shows Ilo and its peripheral circuits. l10100~BOO are latch circuits,
A well-known device including a gate circuit, μPD752, is used here.

In l10BOO of Fig. 4-11, the output boat O is connected via a DC driver to the drive circuit of the motor Ml that rotates the screen drum 11 and the insulating drum 7, and is connected to a high voltage transformer for each corona discharge. . The input boat A receives the clock pulse CLK from the disk 83, which is the basis of the timing operation of the transformer and clutch.
Input connection via line receiver (input interface). Further, a switch SWI that is linked to the main switch SW is connected to the input port I2 to contribute to determining whether the switch is on or off. Further, the boat 3 is connected to a circuit of a thermistor Thl that detects the temperature of the fixing heater, and contributes to determining the wait time up.

In l10200 in Figure 4-2, 00 and 02 are connected to each variable power motor M3 and outlet switching motor M2 via the same input circuit as M1, and 01.03 is connected to each variable power solenoid SLI and outlet solenoid. Connected to SL2 via the same input circuit as the CLI, ■1 to I3 are RDIs of Hall elements HIC provided in the lens system path, RD6°RD7
(eg, 0.6, 0.7 times), is connected like the input B port and contributes to the magnification set.

In l10300 in Figure 4-3, IO and If are connected as described above to TP and 5P (ray, sorter) of the Hall element HIC provided at the exit to determine whether the output is a tray or a sorter, and contribute to the exit set. do.

OO~03 are lamps L1~L3 (medium) for displaying gradation.

Lamp L0.6 for variable magnification display (dark, light). Lo,
Connected to 7°Ll, 0 (0.6 times, 0.7 times 2 equal times).

In l10400 in Figure 4-4, OO~03 are lamps LS, LT, and LD for displaying the paper feed port and exit.
.

LP, LC (each sorter, tray, deck, no paper.

cassette). IO is a switch KCNT that detects the insertion of a key counter that counts the total number of copies.
connected to. II and I2 are connected to a well-known optical sensor 60 and a microswitch 61 for detecting no paper in the cassette or deck.

Figure 4-1 shows the KE for inputting signals from each key into the computer and driving the segment display.
Y & DISPLAY I10 port io.

It is. In the figure, MAT is a well-known matrix circuit whose intersections are energized when the key is turned on, and TO to T5 are display devices 23-1.
．． 23-2 digit selection, time division scan signal for scanning the matrix circuit, KRO-KH2 is a port for inputting the matrix signal by key-on, 100
106 and 107 are driver circuits as shown in the figure made up of transistors. In MAT, rOJ rlJ---
-1'-9J is numeric key, CL is clear key, copy
is the 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 designation 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.

Signals from each motor circuit and disconnection detection circuit are input to the I port of l10500 in FIG. 4-5. The signal for turning off relay Kl from port 0 is sent to jam indicator 41.
．． A signal for lighting 42 is output. l10600 in Figure 4-6. l10700 in Figures 4-7.

A circuit for detecting the advance of paper is connected to the I port 800 in FIGS. 4-8. The O port of 600 has an indicator 43.
．． 46 to 48, and the O port of 700 has a clutch CL2 for moving the optical system I forward and backward.
An activation signal for CL3 is output. Sorter door switch 74, web sensor 73.800 for 800 11~■3
The O port of 03.900 is connected to the high voltage circuit drive section. Note that HVTA-F has corona dischargers 2, 3, 6, .
4-11A for operating 17-2 and 11. The I ports of 800 and 3.900 are respectively connected to the high voltage circuits and input operating state signals. l
10AOO is the signal necessary for sequence control, DHP (
signal that detected the stop position of the screen drum), OHP
(signal that detected the optical system stop position), registration signal RG
It is connected to each Hall element so that the inverted signal OBP is input.

The CPU is 1 for specifying the address of the above memory and input/output device.
One or more registers AC, PC, one or more registers A, B, C, D for primary storage, overflow bit OV
F. Control unit C with addition/subtraction logic control for decoding data input from the block CFT data signal line and processing the data.
T, arithmetic circuit ALU, this arithmetic circuit ALU has data 1
It has functions of 0-base correction, addition, and exclusive OR. 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 circuit and is connected to the external circuit through a plurality of lines. To give you an overview, first the RO is programmed with a sequence from the CPU.
Specify the address of M, the contents of the specified address are read into the CPU through the data signal line DBI, the CPU decodes this, and according to the decoded contents, the CPU Processes data internally, sometimes stores data in the CPU to a specified address in RAM, inputs data at a specified address in RAM to the CPU, and sometimes Sequence control is performed by outputting the data in the CPU to the signal line DB3 of the output sections l10-1 to l10-4, and inputting the contents on the signal line DBa of the human output section into the CPU.

FIG. 5 shows that the memory RO of FIG. 3 is encoded in this order.
Stored in M. This is a flowchart showing a control program, and when a sub power switch (not shown) provided in the main body is turned on, the control unit including the CPU is powered on, reads the program from the ROM, and starts processing (STAT).

Step 1: RAM 4 bits, 256 words, address x'
Clear all data from o o o' to X' OF F'. Then, it is determined whether the switch SW is on or not, and when it is on, step 2 is executed. This determination is I
Input port I2 of 10 port BOO (Figure 4-5) is 1
The CPU specifies chip BOO, takes 4 bits of its input data into accumulator ACC, repeats the left shift, and determines whether 1 is set in the first bit.

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 1 In the standard mode, when the reduction is 1x, the exit is the tray, and the copy density is medium, the RAM data is (X' 04
3') is a number other than 0, (X'033°) is 0° (X"053') is 0. (X"042°) is 2. (X“
032°) is a number other than 2. Furthermore, (X'043')
is the data at address X'043°.

Regarding step 3, the number of sheets of paper stored in the deck is four times that of the cassette (approximately 2000 sheets). Therefore, frequently used paper (for example, A4 size) is stored in a deck and normally fed from the deck. Here, first, in order to select a deck as the standard mode, the presence or absence of a deck is checked. l1040
The paper detector 61 is checked by sensing 0. If you have paper, set the data on the deck into RAM. In other words (X'
052') is set to 8 (3-1). When there is no paper in the deck, select a cassette, check the paper detector 60 to see if there is paper in the cassette, and if there is no paper, the paper out lamp 33
To light up, set (X' 062 ') to 8,
If there is paper in the cassette, 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 11 copies and the number-of-copies counter 23-2 as O, the hundredth position (X'03A') of the RAM counter SET is changed to the tenth position of O9 (X'03B'). 0. - position (X'03G')
is 1, and the hundredth position of counter C0PY (X'04A')
to O9 tenth position (X'04 B') to O9-position (X'
04C') to 0.

In step 5, 4 bits of the data set in the RAM in steps 1 to 4 are simultaneously output to the I10 port. Display data (X'022°) is (X'032') +
(X'052') + (X'062') is added and output to l10400, thereby lighting the paper out lamp, deck, and cassette selection display lamp. In standard mode, 6 or OO~03 becomes 011
0 is output and the deck indicator lamp and tray indicator lamp light up. (X' 023°) is (X'033') ten (
(X'053°)
3') to the I10 port of X'300' to create a 1x lamp.

Turn on the medium density lamp. Furthermore, X'02A' to X'0
Output the RAM contents of 2C' and X'03A' to X'03C' to Key & Display 110
2 to display 001,000 each.

In step 6, read the key of the K ey & I/O device, that is, the address X″700″700″.
'F' is inserted. If there is any input, the data is 1
The details are shown in the flowchart in Figure 6-1. This flow is based on the μPD757 specification method, and each step is stored in the ROM. handle.

In step 7, the input data stored in step 6 is set in the necessary address of the RAM according to the contents. For example, when you turn on the magnification 0.7 key, (X'01C') is 1, so (X'033') is set to 8, which is 0.7, and bit 1 is set to 0.7. '018
') is 9, so (X'02B') is X'02A' Niji7) L/, (X'02 C') is X'02B'
and set 9 to X' 02 C'. 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 unit set in step 6.7 is determined by (X"052'), that is, if it is 0, it is a cassette, if it is 4, it is a deck, and the paper detector 60.
Check the status of 61. 60b and 61b are lamps 6
This is a CdS that detects changes in light reflected by paper 0a and 61a, and when there is no reflection, it is considered that there is no paper.

Then, as in step 3, the paperless lamp is turned on or off. In the following, "b" means a lamp and "b" means a light receiving element.

In step 9, it is determined whether or not the positions of the lens system and mirror system correspond to the specified positions.If they are not at the specified positions, the positions are changed (FIG. 5-2). Regarding step 16,
The data in the RAM from step 7 is compared with the data from the port (2) of the l10200.

In other words, RAM's (X'033°) and (X'043')
Determine whether they are equal or not. Now specify 0.7 times,
Assuming that the position of the lens system is at 0.7 (X'033'
) is 1000 and (X'043') is 1000, so they are equal. When the lens system position is equal to the same magnification, Ilo's 200I2 is 0
Therefore, (X' 043 ') is 0000 and they are not equal to each other, so the lens position is changed. First, the optical system is moved by turning on the variable magnification motor M3 and turning on the rotation locking solenoid SL3. When the magnet attached to the lens reaches the position of sensor RD7, ■2 of l10200 becomes 1, so motor M3. Turn off solenoid SLI. Also, set the data at X'043'.

In step 1O, the state of the power switch SW is determined when the lens system is at the specified magnification change position, and it is determined whether or not the control should be restarted. This is done by sensing boat I2 of l10BOO. When the SW is off, return to the start and clear the RAM.

In step 11, it is determined whether the paper exit position is at the specified position. Change the exit when it is not in the designated position (5th -
Figure 2). In step 18, the RA according to step 7
The data of M (X'032') is compared with the data (X'042') from the I port of l10300.

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 001 O1 (X'042°) is 001
0te are equal, but when X'042' is a sorter of 0001, they are not equal, so the exit is changed. First, the outlet motor M2 and rotation lock solenoid SL2 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 turns on, the port IO of l10300
Input 1 to determine that the tray position has been reached. Turn on motor M2 solenoid SL2 and
Set data to "042'.

Step 12 is to determine whether a key counter is inserted or not.
l10BO whether the wearing has increased (finished) or not.
It is determined based on the O specification and the sense, and it is checked whether copying is possible. When copying is possible and after changing the exit and variable magnification positions, the routine proceeds to Step 20, the step of setting a 30-second standby timer, through which the routine checks the key manual power again, the paper out check, and the exit variable magnification position check routine. Do the following.

Step 13 is to determine whether or not the copy key 21 has been entered, and the corresponding RAM data in step 7 is determined.

When the copy key is not manually operated, the process proceeds to step 14 to check whether another key is inserted (X' 018°).

Control is performed by checking whether (X'OIC') is F or not. If there is still no evidence that the key has been manually operated, proceed to step 15.

If the routine up to this point is repeated approximately 3,000 times, that is, 30 seconds will elapse since the steps up to this point are approximately 1,000 steps and one step is approximately 10 μsec. Therefore, R.A.
Store 3000 in WA (0) of M (step 20), and decrement it by 1 every time step 15 is executed (
15-1), when it becomes 0, the process proceeds to initial step 5TAT, where the RAM is cleared and the standard mode is set (step 2). In step 14, if a key entry is made during this 30 seconds, step 20 is executed again, 30 seconds is stored in WA (0) of the RAM, and the above subtraction routine is performed. Figure 6-2 shows step 14. 15
Show details. 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 a jam occurs.

When the paper in the cassette runs out, the motor M1 and the high voltage transformer are turned off, but this step 21 is never removed.

Therefore, the RAM data is held and the display such as the number of sheets remains even if the power switch is turned off. Each time one copy cycle is completed (each time paper is fed), the counter copy in the RAM is increased by 1, the value is displayed on the display 23-2, and the value is compared with the counter SET. do. The process then proceeds to step 20, where a timer of 30 seconds is set. The timing at which Ml is turned off and step 21 is exited is after the last paper has passed the paper detectors 64 and 65. Also, even if the clear key is turned on when there is no jam or paper, this step 21 is skipped and the setting time is set for 30 seconds.

After this 30 second setting, if no copy key or other key entry is made, or if a key entry is made and the next key entry is not made, the process returns to the 5TAT step and returns to the standard mode.

If the copy key is turned on within this 30 seconds, copying will be performed based on the previous set number.

In Figure 6-2, microsteps 14-1 to 1
In 4-4, the data of X “018′, that is, the same size, 0.7
．． 0.6, determines the input of the shade key, clear, cassette, deck, sorter, and tray key, but in 14-3, A
AC by taking exclusive OR of data stored in CC and AC
It is stored in C, and if it matches in F, ACC becomes 0.

Therefore, execute 14-5 to 14-8 and similarly
' Determine the data and look at the numeric keys. Microsteps 15-1 to 15-3 set X'001' to X''003° to 3
The digit working register is indicated by WA(0), and this value is subtracted by -1 and the -1 value is stored in WA(0) again. 15-4 to 15-6 are whether the upper digit of WA (0) is O or not, 15-7 to 15-9.15-10 to 15-12 are 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.

Further, the positions of the lens 59 and the mirror 15 are changed according to the zoom specification, depending on the sensor RDI, RD7, . They move in conjunction so that a predetermined optical path length is achieved at the RD6 position. SL3 turns off when the optical system is at a predetermined position and locks it so that it does not move.

FIG. 9-1 is a time chart when moving from 1x to 0.6x. When the key is turned on, the RAM (X'03
3') is 4 and X' 043 ') is O (7)
Set 3 to O of t'110200 and enter SL3. Turn on M3. I of l10200 is Hall element RDI, RD
7. When it is determined by RD6 that the value has become 8 (13=1), SL3°M3 is turned off. And X “043′
Set 4 to . - Fig. 8-2 shows the exit changing mechanism, in which the belt 19 moves up and down by the rotation of the motor M2. The position of the belt 19 is determined by the sensor 70 according to the exit designation.
, 71 is turned on so that it becomes a predetermined exit (SL2 turns off when the exit is in a predetermined position and locks the exit so that it does not move).

FIG. 9-2 is a time chart when moving from the tray to the sorter. When you turn on the key, the RAM (X' 03
2'), but since X'042') is different from that, set O in l10200 and set SL2. M2 is turned on and SL2 is turned on as described above (by the signals of sensors 70 and 71).
．． This is to turn off M2 and set it at a predetermined exit.

As described above, the present invention displays conditions according to various key manual inputs, and when the process does not start within a predetermined time from the last key manual input, the display is cleared or set to the standard mode display, thereby reducing image formation errors. , rapid restart of image formation can be expected.

FIG. 10 is a flow chart showing in detail the jam determination step 21-3 of FIG. 5-1.

In step 31, a jam caused by a paper jam or the like in the paper path is detected. A jam is detected by sensing the paper sensors 62 to 67 in the copying machine and the paper sensors 68 and 69 of the sorter at predetermined timings to determine whether or not the paper reaches the paper sensors 68 and 69 in the sorter at a predetermined timing. Each sensor outputs a signal l when a well-known optical detector detects paper. 62.
Reference numeral 63 denotes a paper feeding section, 64° and 65 indicate a conveying section, 66 and 67 sensors for a discharging section, and two sets of lamps and light receiving elements are provided at predetermined positions at 62, perpendicular to the direction in which the paper travels. I check for skewed paper and stop feeding. Note that the paper detection signals of the sensors 62 to 65 are J1 to J5, the signal of the exit sensor 66°67 is Jtl, and the other sensor signal for JSI skew is J, /. 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. If it is on, proceed to step 33,
Scan the sensors 62-69 again to see if there is any paper left. If it remains (step 34), an error flag is set in the RAM as an error mode, and F-P is displayed on the segment display 23-1 for setting the number of copies.
is displayed (step 35). This step 33-35
, each paper is checked and displayed in the order of location starting from the sensor 62, and the sensor 62. When paper is detected at 63, the copy count segment display 23-2 indicates E.
1. E 2 is displayed alternately. This routine corresponds to the routine excluding steps 11-5 to 11-7 in FIG. 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 ends or moves to a re-copying operation. If the clear key is turned on when the copy key is not turned on, the process proceeds to step 20, the standby set, and the data manually generated by the key can be stored in the 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 unless the clear key is turned on in the SW neon state. However, if the SW is turned off, the fifth
Return to step 5TAT in Figure 1, 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.

No. 11-1. Figure 11-2 shows step 11 in Figure 5-1.
A diagnostic flow is provided between and 12. In other words, the power switch detects whether paper remains in the paper sensor in the paper path after the paper is loaded and displays it, detects a disconnection of the thermistor for temperature control of the fuser and displays it, and closes the side/plate of the sorter. This system detects and displays whether or not the machine is running, and enables copying to be started after previously checking areas that would not normally be checked, thereby avoiding an increase in trouble.

At step 11-1 in the figure, the paper sensors 62 to 67 are scanned and sensed, and the data of each sensor is stored in a register. First, the presence or absence of paper is determined by the sensor 62, and if there is paper, data is set in X081 of the RAM.
An error flag is set to 0 (11-3). Next, the presence or absence of paper at the sensor 62' is determined and the same operation is performed (11-4). After detecting the presence of paper in the tray-side discharge detection sensor 66 and the sorter-side discharge detection sensor 67 and setting an error flag, etc., the operational amplifier OPI, which outputs 1 due to a disconnection of the thermistor, is checked (11-5). l
When , set the data to X091 of RAM and
Set the error flag to 0. Similarly, the sensor 73b 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 74 (11-7).

Thereafter, the jam detection sensor 68 provided at the sorter entrance and the sensor 69 provided on the sorter tray sense whether there is any paper (11-9) and store the paper in the RAM.

Then, the set state of the error flag in the RAM is sensed, and when it is set, the error mode is displayed using the segment display 23-1 and 23-2 as described above (11-1).
1O). This step is similar to step 35 in FIG. 10 and will be described in detail later. After that, these routines are repeated (repeat. If the error flag is not set or if the flag is cleared by removing the paper on the sensor, the segment display 2
3-1.23-2 displays the SET of RAM, the number of copy sets stored in the C0PY area, and the number of completed copies, and the process exits to step 12.

In FIG. 1, 72 is a web that is previously cleaned on the insulating drum 7 and is wound in the direction of the arrow. 73 is a well-known optical sensor that detects the end of the web and informs that there is no web, and its output is input to 2 of l10800. Also, 74 is a microswitch that is turned on when the side plate of the sorter (opened and closed to take out the paper) is completely closed, and its output is l1.
It is input at 13 of 0800. Further, 68 is a well-known optical sensor for detecting whether paper is jammed near the sorter entrance, and 69 is a well-known optical sensor for detecting whether paper is jammed at each of the sorters.The output thereof is similar to I3. l108
It is input to Io of 00. The jam detection paper detection sensors 62 to 67 in the copying machine path are l10700. l106
00 I. -The thermistor disconnection detection signal is I105 on I3
It is input to ■3 of 00. The signals from each of the above sensors serve as conditions for display control as described above.

Next, the error display operation (step 35) will be explained with reference to FIG. The keys and display chip μPD757 used in the Ilo 100 have a relationship between 4-bit hexadecimal code input and segment display as shown in Table 8.

Table 3 Code 01234567897 Segment display g 1 z I q55 7Hg
Code X'A'X'B
'X'C'X'D'X'E'
X'F' 7 segment display EFLP - Blank Also, the relationship between the error content and the segment display is 23-1°2 when there is paper in the jam sensor 62.62'
3-2 is displayed as E-P, El. Display 23 here
The F of -1 means that the diagnostic program is being executed, and the right digit P means the diagnostic mode, in which case there is a jam. D is displayed when the diagnostic mode is standby. Display 23-2
E means an error symbol displayed when an abnormality is detected, and the 1 on the right turn through the blank indicates the location of the abnormality.

23-1 and 23-2 are displayed at the same time. Therefore, E-1 to E-8 correspond to the paper sensors 62 to 69, E-9 and E-10°E-1 correspond to the web check sensor 73, sorter switch 74, and thermistor disconnection check sensor.
Display 1. If an abnormality occurs in multiple locations during jam or standby, for example, during standby, the sensor 63
When the sensor 73 is abnormal, the display 23-1 displays F-0, and the display 23-2 alternately displays E-2 and E-9.

This operation will be explained using the 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, a hexadecimal code XA (BCDIOIO) is set in the RAM address X0D3. When this is decoded by the 110-X700, it becomes E as a 7-segment display, and when this is output (displayed), it means that there is an abnormality in the diagnostic result.

In step 35-2, hexadecimal code XF is set to X0D4.
(BCDIII). This is KEY&
D i s p l a y I / O-X 1
It is decoded by 00 and becomes blank. Next X08
1 as the RAM address and continue with step 35-
Proceed to step 3.

In step 35-3, if the content of the RAM address specified in the previous step is 0;

If the specified RAM address is +1 xosi, set it to X082 and lower 4 bits of the address.
The value is hexadecimal (7) XA (BCDIOIO) Repeat step 25.

Here, if a value other than 0 is set in the specified address of the RAM, the lower value of that address will be displayed as an indication of the mode in which the abnormality was found as a result of the diagnosis in the previous step. Set 2 to X0D5 and
0D5 to X0DO teno data sequentially l1O-X70
Output and display at 0. Then hold the display for about 1 second and
Proceed to o, and in the same way, the lower order of the specified address in RAM is 1.
Repeat until hexadecimal XA (BCDIOIO) is obtained. In other words, the display in steps 35-2 and 35-3 is to sequentially display the error modes set at RAM addresses XO81 to X089 at one-second intervals. For example, when there is paper in the sensor 62 in standby diagnostic mode, the digit switching timing signal T of l10100. rT
The display data corresponding to l + T2 + T3 + T4 + T5 is set to F, -, O, E, and blank.

Set to 1.

Steps 35-4 to 35-6 are for each RA similarly to 35-2.
M address X090 to X099. X0AO to X0A
9°X0BO to X0B9. The error mode data set from X0CO to xOC9 is displayed sequentially at 1 second intervals.

Note that X0AI to X0C9 store diagnostic data in a diagnostic mode, which will be described later, so a predetermined display is performed in the diagnostic mode.

As described above, the present invention utilizes a display device such as a segment display device that performs specific display to display an abnormality, and when multiple abnormalities occur, the display unit alternately indicates that fact, so a variety of display devices can be used with a small number of display devices. Displays and warnings can be provided, and the device operation section can be simplified.

In normal standby mode, the numeric key 22 and clear key C are used to set and clear the number of copies, respectively, and the displays 23-1 and 23-2 are used to set the number of copies and to set the number of copies to be completed, respectively. Perform display.

However, in the present invention, step 1 and step 2 in Figure 5-1
Since a diagnostic step 100 is provided in between, the keys and numeric display become command switches and indicators with other functions during the execution of the program. When the power switch SW is turned on, step 1 is executed according to the standby program shown in FIG. 5-1, and then the diagnostic program io is executed.

Execute. As shown in FIG. 13, the diagnostic program first clears the error memory in step 101.

This is the address x'oso in the RAM in Figure 7-1B.
°~X'089', X'090'~X'099'.

X'OAO'~X'OA9',X'OBO' ~
X'OB9°.

Set 0000 (hereinafter referred to as O) in X″OCO°~X′OC9′.Furthermore, clear the memory address X″ODO′~X′OD5° for storing and displaying the diagnostic mode, that is, set it to O.

At step 102, it is displayed that the diagnostic program has started. First of all, X'ODO', X'OD1', X'
Hexadecimal number X'B' (binary coded 10
toll), X'E' (also 1110), X'F' (similar!,: 1111), and then 1: X'OD3', X'OD4'.

Set 8 (1000) to each of X' OD 5 '. And Key & Display
10-X'100' to X' OD 5' to X' O
The data up to D O' are sequentially output from the CPU. Poe 1-Il
o-X'lOO' decodes the 4 bits of the input data, and displays the following on each of the displays 23-1 and 23-2 in accordance with the above code. In other words, timing T. ,T,,T2. T3. When T4°T, the display 23-1 is F, -, blank, and 23-2 is B I
Display B I E. Here, F at timing T0 means the start of execution of the diagnostic program. Since the diagnosis mode has not yet been selected in step 102, T2
At the timing of , it is left blank, that is, there is no display.

Also, from T3 to T, the diagnosis results are originally displayed, but in step 102, IF1. Displays no errors for B and H.

In step 103, it is determined whether an error has occurred or not based on whether an error flag is set. When an error occurs, a value other than 0, for example l, is placed in RAM address
is set (no error when 0), the error mode is displayed (described later). However, when this routine is executed for the first time, x' o a o.

is 0, so it is not displayed.
Display up to Oo in the same manner as in step 102, and jump to step 104.

At step 104, the CPU uses the Key & Disp
layIlo-X'lOO°heno input data, that is, if there is no input that accepts the input of the key 22, step 103
Return to step 104 and repeat. If a key is pressed, decipher its contents, and when the clear key is C, end the diagnostic program and jump to END, then return to PO of the standby program.
Return to N. (Figure 5-1) The keys are numerical keys.

? 2, the process proceeds to the next step 105. If other keys such as the cassette stage designation key are manually operated, the process returns to step 103, executes step 104 again, and waits for the input of a numeric key or clear key.

At step 105, as in step 101, data at each memory address in the RAM is cleared.

In step 106, the input key switch value is decoded and the value is stored in the RAM X'OD2'.For example, when key 1 is on, it is set to X'OD2', and X'OD3' to X' Set O to OD5'.

Key & Display in step 107
l10-X'lOO° to X'OD 5'~X'
The ODOs are sequentially output and the following display is made on the display 23-1 and 23-2.

Timing T0. TI, T2. T3. T4. When T, the display 123 is F, -,1,124 is Dl fV l
, display.

Here, at T2, a display indicating the diagnosis mode (here motor diagnosis) selected by the operator is made, and D of T3rT4+T5 indicates that the diagnosis is being executed.

Next, various diagnostic modes and their diagnostic control will be explained.

(Mode display F-L) This is a diagnostic mode that determines whether O is set in RAM This is a mode in which the operator visually determines whether there is any deterioration.This is done by turning on all the display outputs of Ilo shown in FIGS. 4-1 to 4-12.

(Mode display F-1) This is performed by determining whether l is set in X'OD 2°, and is a mode for automatically diagnosing whether there are any abnormalities in the various motors. An example of checking the main motor Ml is shown in Fig. 14-1. i.e.
Output ooo, turn off M+, and after delaying the timer for a certain period of time, input 4 bits of X"600'.X'
Determine whether Io at 600° is 1 or O, and when it is l, X'O
Set B1', X'080'' to 1 and set Ml's address data error flag to 5.X'600
After outputting 0001 to ', turning on Ml and delaying the timer for a certain period of time, 4 bits of X'600' are input.

When Io of X'600' is O, X'OB1',
Set 1 to '080' to turn off M. Subsequently, the optical system motor M3 and the exit motor M2 are diagnosed in the same manner, and when an abnormality occurs, corresponding data is set and an error flag is set.

Diagnosis of various motors according to the flowchart of FIG. 14-1 is performed by the A circuit of the output section I10 of FIG. 4-1.

First, when the motor M+ is off, the triac TA for the motor switch remains off, and the output signal of the photocoupler phc connected to both ends of the triac is at logic level 0. However, if the triac TA and its trigger circuit are abnormal and are always on, the output signal of the photocoupler phc becomes 1. This can be determined at the program step to determine an abnormality. Further, if the triac TA is not turned on when the motor Ml is turned on, the output of the photocoupler, which is a rubel in the normal case, becomes O, so abnormality can be determined in the same manner. In this way, various motors Mt.

M2. M4. M3 Fan motor FMI to prevent temperature rise inside the machine, FM2. A similar detection circuit is provided for FM3 to perform diagnostic operations. And address X'OB in RAM corresponding to each type of motor.
Set a value other than O to 1° to X"OB9°. At the same time, set an error flag (x"o ao').

(Mode display F-, :') This is executed using the RAM data set by turning on key 2, and is a mode for diagnosing various high-voltage transformers.The flowchart for diagnosis is the same as that for motor diagnosis. Similarly, replace Ml with HVTA.

B, C, D, F, G---1, and the diagnosis is performed in the same manner. Also, the circuit is No. 4-11
As shown in the output section B in the figure, when a high voltage output is output from the high voltage output detection terminal of the high voltage transformer, a logic level 1 is output.

(Mode display F-3) This mode is performed by determining 3 of X'OD2' set by the key 3, and is a mode for determining abnormalities in the sensors 62 to 69 for detecting various jams. An example of diagnosis of the sensor 62 is shown in FIG. 14-2. That is, first I10
Input 4 bits of port X “400”,
(1) Determine whether Io is 1 or 0, and when 1 (7), X'
081'.

Set 1 (0001) to X“080′.

Next, X'400' (when Dlo is O, X'800
'J,: Output 1000, turn on relay Kl, turn off lamp L, input 4 bits of 400°
Determine whether IO of "400' is 1 or O (X' if 0
081', set 1 to X'080'. Similarly, other jam sensors are diagnosed and memory operations are performed.

Diagnosis of the jam detection sensor according to the flowchart of FIG. 14-2 is based on the 0 circuit of the input section shown in FIGS. 4-6 to 4-8.

Normally, the lamp L for CdS irradiation is on and the input to Ilo is 0, but if the lamp L is disconnected or there is a paper jam and paper remains untreated, the input to Ilo becomes 1. Abnormalities can be detected. Also, when diagnosing CdS destruction or an abnormality in the input interface part in the opposite case to the above, turn off the CdS irradiation run L and set the relay to 1.
Turn on, stop the light irradiation to the CdS, and perform the opposite judgment to the above. If the above diagnosis results in an abnormality, 1 is set in RAM addresses x'osi' to X'089' corresponding to each sensor, and an error flag (X'080°) is set.

(Mode display F-' This is due to turning on key 4, various positions (optical system,
In this mode, seven detection sensors 44 to 50 (exit, etc.) are diagnosed. If the result is abnormal, move to the RAM address X' OA 3° to X' OA 9'' corresponding to each sensor 1
and an error flag (x' o s o '). FIG. 14-4 shows a flowchart for this purpose. That is, first, the main motor Ml is turned on to prepare the optical system for reciprocating movement. Then, it is determined by the sensor 84 whether the optical system is stopped, and if not, the reciprocating clutch CL2 is turned on to return the optical system to its original state, and the check is performed again after a predetermined timer (maximum waiting time). If 1 is still not detected by the sensor 84, an error flag and error data 3 of the sensor 84 are set in the RAM.

After that, or when the sensor 84 is normal, the reverse clutch CL
2 and turn on forward clutch CLl.

Similarly, after a predetermined timer period, the sensor 83 turns on (
Whether the signal RG is 1) is determined. When an abnormality occurs, an error flag and error data 5 are stored in the RAM.

Similarly, the sensor 85 is checked and the data is stored in the RAM. When this is completed, the main motor Ml is turned off and the variable magnification motor M3 is turned on to detect whether the sensor 86 (RDl) is 1 or not. Here, it is always in the detection state during the time that would normally take, and if no detection is made within that time, an error flag and error data are set. Here, the time set corresponds to a predetermined number of times of execution of this time-up determination routine.This method is the same as step 15 in FIG. 5-1.Similarly, the sensor 87,
88 and turns off the variable magnification motor M3.

After that, or when the variable power sensor is normal, the exit sensor 70
．． Check the status of 71. First, the presence or absence of a tray is detected by the tray sensor 70, and if the tray is present, the exit motor M2
, and check whether the sorter sensor 71 is on. If it is not on, it is considered abnormal and RAM processing is performed. When the tray sensor 7o is off, the sorter sensor 71 is checked. When 71 is 1, clutch SL2 is turned on to change the direction of rotation of exit motor M2, and M2 is turned on to raise the belt. If the tray sensor 70 is not turned on after a predetermined period of time, it is assumed that 7o is abnormal and the same RAM processing as described above is performed.

Tray sensor 70. When the sorter sensor 71 is off, it is assumed that both sensors are abnormal and RAM processing is performed.
Turn off SL2 and return to the main flow in FIG.

Thereafter, the process proceeds to display step 103 in FIG. Note that the timer operation shown in the figure can be performed within the CPU and is well known, and will not be described in detail.

(Mode display F-5) This mode is performed based on turning on the key 5, and is a mode for diagnosing the clock pulse generator 82 synchronized with the rotation of the drum. Figure 14-3 shows the diagnostic flow.

First, output 0001 to X'600', turn on the main motor M1, input the 4 bits of the output CP reading report X of the clock pulse generator X'300', and
Determine If of 00' (A input circuit in Figure 4-11). Execute the timer operation even if the CP is 0.1,
After that, the CP is determined again. Note that this timer is set to one cycle or more of the clock pulse. First, if CP is 0, then it is determined whether or not it is 1, and if it is 1, it is next determined whether or not it is O, and each 1. When it is O, it is considered normal and M+ is turned off. However, each 0. When it remains 1, X'OAl°,
It is set to X "080'. In other words, if there is no change in the output of the clock pulse, it is determined that there is an abnormality.

(Mode display F5) This mode is activated by turning on the key 6, and is a mode for diagnosing the screen drum stop position detection sensor 51. Diagnose using the same method as mode 5 above, and if there is an abnormality, check the RAM
A number other than O (for example, l) is set to X' OA 2°, and an error flag X'080'' is set.

The above has described the determination up to mode 6 by turning on keys O to 6, but by reusing keys 7 to 9 and the cassette key, etc., various other diagnostic modes are executed, step 107 is completed, and the error flag is determined again. Then, the process advances to step 103 for error mode display. In the second and subsequent steps 103, as a result of the diagnosis performed in step 107, if an error is detected, an error flag (x'oso') is set, so the error flag is displayed using the display method of the error mode, and multiple errors are detected. When , the displayed contents are changed sequentially.

Note that the error mode is not displayed when there is no error as a result of diagnosis. Data 8 to X'OD3' to X'OD5'
(BCDlooO) and
'ODO' Key & Display l10
- Display through X'lOO'. That is, for example, when diagnosing a motor, timings To, TI, T2. Ts,
T4. In response to Ts, the display 23-1 shows F, -,1
, 23-2 displays Il, E, and B.

By executing the above program, the numeric keys θ~ used for setting the number of copies in the normal standby routine.
9 also has the function of instructing selection of the diagnostic mode and termination of the diagnostic routine in the diagnostic routine, respectively, which contributes to cost reduction and simplification of the operating section.

In addition, a display 23-1.23 used for setting the number of copies and displaying the number of completed copies in the normal standby routine.
-2 respectively display the above-mentioned diagnosis mode and diagnosis result, contributing to cost reduction and simplification of the display unit.

In addition, multiple loads can be diagnosed with a single keystroke, making the operation less cumbersome.

Further, since the diagnostic results are repeatedly displayed in sequence on one display, warnings can be emphasized.

Incidentally, Figs. 15-1 and 15-2 show the micro flow of Fig. 13 when the μC0M4 is used.

Figure 15-1 is the key human processing step 10 in Figure 13.
4゜Error memory clearing step 105, the first
5-2 is a key value decoding step 106 and a diagnostic mode selection step 107. Here WR(6) is RAM nox
'ots' data, WA (2) is RAM (7) second
This is working register data. Figure and μC0M4
The details are omitted as it is clearer than the previous system.

[Brief explanation of drawings]

FIG. 1-1 is a sectional view of an image forming apparatus according to the present invention;
Figure 2 is a sectional view of the sorter, Figure 2 is a plan view of the operating section in Figure 1, Figure 3 is a control circuit diagram in Figure 1, and Figures 4-1 to 4-11 are inputs in Figure 3. Output circuit diagram, Figure 5-1, Figure 5
Figure-2 is a control flow chart, Figure 6-1, Figure 6-2.
The figures are detailed flowcharts in Figures 5-1 and 5-2, Figures 7-1 and 7-2 are memory diagrams in Figure 3,
Figure s-i and Figure 8-2 are partial sectional views of Figure 1 and Figure 9-2.
Figures 1 and 9-2 are operation time charts of Figures 8-1 and 8-2, Figures 10, 11-1, and 11-2.
12 and 12 are other control flowcharts, FIGS. 13 and 14-1 to 14-4 are control flowcharts for performing diagnostic operations, and FIGS. 15-1 and 15-2 are This is a detailed partial flow chart of FIG. 13, in which 14 is a tray, 18 is a sorter, 52 is a cassette, 53 is a deck, 9 is a paper feed roller, 59 is a lens system, 21 is a copy key, and 22 is a number key. . 28-1 to 28-3 are gray scale keys, 24.25 is an exit designation key, 26.27 is a paper feed section designation key, and 30-1 to 30-3 are magnification designation keys.

Claims (1)

[Claims] An image forming means for forming an image on a recording medium, a display means for displaying information related to image formation, a means for selecting a check mode for checking an abnormality of the apparatus, and a check mode selection by the selection means. control means for causing a part of the apparatus to operate in a specific manner according to the selection of the check mode by the selection means; An image forming apparatus characterized by driving and controlling a display means.