JPS6129830A - Copying machine - Google Patents

Abstract

PURPOSE:To use effectively a copying machine by providing a controllable original illuminating means, a detecting means which detects faulty illuminating lamps, and a means which generates effectively an original image on a photosensitive body except parts corresponding to faulty illuminating lamps. CONSTITUTION:Copying operation control data is written in a RAM203 or is shifted and stored there from a ROM in a CPU, and memories Q1-Q4 are provided in accordance with selecting keys 100-103; and for example, the magnification displayed on a display device 72 is written in the memory Q1 or the magnification in the memory Q1 is read out to the display device 72 when the selecting key 100 is turned on, and the magnification is written in or read out from the memory Q2 when the selecting key 101 is turned on. The second CPU202 which controls an optical system controls is controlled through an interrupt terminal INT and data input terminals SIN and SOUT by the first CPU201. Thus, an original is copied effectively in the normal part of the original illuminating device even if a part of this device is faulty.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a copying machine, and more particularly to a copying machine that illuminates an original and transfers the original image to a photoreceptor.

PRIOR ART In this type of copying machine, the document illumination device is constructed of, for example, a linear LED array, and the lighting width is controlled according to the width of the document by selectively emitting light from each LED. It is possible that In such a copying machine, even if a small number of LEDs fail, it is possible to copy the parts corresponding to normal LEDs, so it is uneconomical to stop copying due to such a minor failure.

Purpose of the invention This invention was made in view of the above circumstances, and
To provide a copying machine capable of copying a normal part even if a part of a document illuminating device is out of order.

Structure of the Invention The copying machine of the present invention includes an original illumination means in which a plurality of illumination lights are arranged and whose illumination width can be controlled, a failure detection means for detecting a malfunctioning illumination light among the original illumination means, and a failure detection means for detecting a malfunctioning illumination light among the manuscript illumination means. The apparatus includes means for effectively creating an original image on a photoreceptor except for corresponding portions.

X administration An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of a copying machine according to the present invention. A photoreceptor drum 1 that can be rotated counterclockwise is arranged approximately in the center of the copying machine body, and around it are a main eraser lamp 2, a sub-charger 3, a sub-eraser lamp 4,
A main charger 5, a developing device 6, a transfer charger 7, a copy paper separation charger 8, and a blade type cleaning device 9 are provided. The photoreceptor drum 1 has a photoreceptor layer provided on its surface, and this photoreceptor is sensitized and charged by passing through the eraser lamp 2.4 and chargers 3 and 5, and receives image exposure from an optical system 10. .

The optical system 10 is installed below the original glass 16 so that the original image can be scanned, and includes a light source 700 and movable mirrors 11 and 1.
2.13, a lens 14, and a mirror 15. The light source 700 and the movable mirror 11 move to the left at a speed of (ν/I) (where IIl: copying magnification) with respect to the circumferential velocity (V) of the photosensitive drum 1 (constant regardless of the same magnification or variable magnification). The movable mirror 12.13 is driven by the DC motor M3 so as to move to the left at a speed of (v/2 m). Note that when changing the copying magnification, the lens 14 moves on the optical axis and the mirror 15 moves and swings.

On the other hand, there are paper feed rollers 21 on the left side of the copying machine body.
.
, a conveyor belt 27, a fixing device 28, and a pair of discharge rollers 29.

700 is an LED (light emitting diode) array for illuminating the original, and LEDs 701 to 730 are arranged in the width direction of the original as shown in FIG.

Reference numeral 800 designates an LED array for both site erase and inter-image erase during variable-magnification copying of the photoreceptor drum 1, and as shown in FIG. They are arranged along the axial direction and over the entire length of the cylinder of the drum 1.

900 is a photodiode array for detecting document density. This consists of 30 7-rays from 901 to 930,
Adjustments are made so that the reflected light from the document portions, each corresponding to the document width on the document surface, is inputted via the first mirror, second mirror, and third mirror.

FIG. 2 shows the arrangement of operation keys on the operation panel of the copying machine. The operation panel 70 includes a print key 71 for starting the copying operation, and a numerical display device 72 capable of displaying 4-digit numerical values, 1, 2, . ..., 9,
Numeric keys 80 to 89 corresponding to the numerical value 0, interrupt key 90 for specifying interrupt copying, clear/stop key 91,
A paper selection key 92 for specifying copy sheets mounted in multiple stages by size, a group of keys 95 to 103 related to a copy magnification setting device, and the like are arranged.

The first magnification setting key group 95.96, 97.98 is arranged for the purpose of arbitrarily setting the magnification, and when the key 99 for switching the first magnification setting mode is operated, the copying machine is controlled. When any key is operated while the mode is switched to the first magnification setting mode, the numerical value inputted by the numeric keypad and displayed on the display device 72 is
The copy magnification is stored in the memory corresponding to the operated key.

Second magnification setting key group 100, 101, 102° 103
has a predetermined copy magnification set in its corresponding memory in advance, and the copying operation can be executed based on the preset numerical value without having to set numerical values as in the case of the first group of keys. It is considered as such. Therefore, the preset copying magnification is selected, for example, a magnification that is considered to be commonly used for each destination at the time of factory shipment. This will be explained in detail later.

In addition, the first set of keys allows the user to freely set the required copying magnification, and the second set of keys is generally used. For example, if it is a domestic specification, A4 → B5. B4→A4. A
3→A4. Alternatively, it is given a functional role such that the magnification corresponding to A4→A3 etc. is preset. However, since the preset value for the second key group is a general or calculated copying magnification,
Due to mechanical or design errors, the actual copy may differ slightly from its copy magnification. For example, even if you select the same size (×1), the actual size is (Xi, 00
4) Or it may be (xo, 996) times. In such a case, the control mode of the copying machine is switched to the second magnification setting mode by operating the second magnification setting mode switching key 104 shown in FIG. It is possible to set arbitrary numerical values in the memory corresponding to each of the keys 100 to 103 by simple operations to obtain a desired copy magnification. Specifically, a numerical value of 1,002 or 0.998 may be set for the same size key.

108 is a document illumination button, which illuminates the document surface with an LE for document illumination.
This is for viewing the original by projecting it on the D800. Reference numeral 109 indicates a service man call indicator, 110 indicates a copyable document indicator, and 111 indicates an image loss indicator indicating that there is a failure in one of the LEDs.

FIG. 3 shows the document setting section, which shows knobs and switches for setting the document size.

When you slide the slide knob 650 for setting documents in the width direction, each size A5. Depending on A4°B5, etc., any of the switches 601 to 604 is set to 0Nt7. 1), and A4. In order to distinguish between vertical and horizontal positioning of B5, one of the switches 605 to 606 is turned on by moving a slide knob 651 in the longitudinal direction.

The above switches 601 to 604 and switches 605 to 6
The combination of 06 makes the original A3. A4 vertical, A4 horizontal, As, B4. It is possible to detect whether the original is placed on the glass (B5 vertically or B5 horizontally).

FIG. 4 shows an LED array 700 for illumination, each of its LEDs 701 to 730, and L for inter-image and edge erase.
ET) Array 800 and each of its LEDs 801~
830 is shown.

The area where the original illuminated by LEI) 701 is projected onto the photosensitive drum 1 is designed to be equal to the area where the LED 801 erases on the drum.
D702 and 802...730 and 830 correspond to each other.

FIG. 5 shows a control circuit used in the copying machine according to the present invention, in which 202 is a second CPU that controls the optical system;
The first CPU of 1 is connected to the second CPU connected via the interrupt terminal INT and the data input terminal 5ins 5out.
6 which controls the CPU 202; and 203 a battery-backed RAM.

204 is a switch matrix, 205 is a drive circuit for a DC motor M3 for scanning an original, 206 is a drive circuit for a stepping motor M4 for variable magnification, and 207 is a decoder. Note that the output terminals A1 to A7 are respectively connected to the main motor M1.
, developing motor M3, timing roller clutch CLI,
It is connected to drive switching transistors (not shown) of the upper paper feed clutch CL2, the lower paper feed clutch CL3, the charger 5, and the transfer charger 7.

Various data for copying operation control is written in the RAM 203 or shifted from the ROM in the CPU and stored therein, and selection keys 100 to 103
Corresponding to the memory Ql.

Q2. 'Q3. Q4, as detailed below,
For example, when the selection key 100 is turned on, the display device 72
The magnification displayed is written into or read out from the memory Q1, and when the selection key 101 is turned on, the magnification is written into or read out from the memory Q2.

In addition, for selection keys 95 to 98, memories Q5 and Q6 are
．． Q7. Q8 is provided in the same manner as described above, and for example, when the selection key 95 is turned on, the magnification is written to or read from the memory Q5.

Table 1 shows codes corresponding to paper sizes.

Table 1 In FIG. 5, 208 indicates each LED array 700 and 80.
This is a display control device that drives 0, and its connections are shown in FIG. Reference numeral 209 denotes a control device that receives photometric input from a seven-otodiode array 900 for detecting document density, and its connection relationship is shown in FIG.

FIGS. 8 to 24 are flowcharts illustrating processing procedures for magnification setting and copying operation control executed by the first CPU.

FIG. 8 is a flowchart schematically and comprehensively showing the processing procedure in the first CPU.

The first CPU 201 and the second CPU 202 communicate with each other by interrupt. 1st CPU 201 and 2nd CP
Information such as a scan command, scan size, copy magnification, timing signal, return signal, and fixed position signal regarding the optical system is communicated with the U202.

If it is determined in step SO that the switch 107 is on after initialization, the process advances to step S1. Step S
In 1, the above memory Q is mainly done at the time of machine assembly = 11- or at the factory shipping stage of the machine
Presetting processing of magnifications for 1 to Q4 is executed.

Details of this process are shown in FIG.

In step S2, it is determined whether each LED is normal. This operation is shown in FIG.

Step S3. In S4, unless the copying machine is in a copying operation, processing is executed to set magnifications Q5-Q8 or 01-Q4 in association with each selection key 95-98 or 100-103.

Details of this process are shown in FIGS. 11 to 13.

In step S5, data for controlling the lens position and motor drive speed is transferred to the second CPU 202 in accordance with the magnification set in step S4. When transferring this data, the second CPU 202 processes it by interrupt.

Step S6 is a routine for inputting the document size whose details are shown in FIG. 16, step S7 is a document illumination routine whose details are shown in FIG. 17, and step S8 is a display of LED failure whose details are shown in FIG. 18. LED) rubble display routine, step S9 is the inter-image erase control routine whose details are shown in FIG. 19, and step S10 is the second
The preliminary scan routine shown in FIG. 0, step S11, is the copy operation routine, step S1 whose details are shown in FIG.
3 is an LED duty control routine for controlling the lighting time width of the LED, the details of which are shown in FIG.

The initial switch in step S1 in FIG. 8 is a switch that is set in a position in the copying machine that cannot normally be operated, so that it can only be opened during assembly in a factory or for service personnel. Only when the switch is repeatedly operated, the process shown in Figure @9, which will be described later, is executed.

Next, the LED cutting height detection routine shown in FIG. 10 will be explained.

The D register here means the LED number. For example, the LED 701 is set to an initial value and the LED 701 is incremented from 702 to 730.

B cash register, l' is 8: + Z no LED 701-708°7
This is a register indicating the order among 09-716.

Since 8 pieces are checked in pairs, use them as codes.

The C register indicates the number of each group of eight.

The first half is each LEI of the illumination LED array 700) paddy detection, and the second half is each LE of the inter-image erase LED array 800.
D-cut detection is now possible.

First, control the LEDs 701 to 708.

In step S23, a pulse is output to the terminal PAO of the control device 208 to light up the LEDs 701 to 708.

Next, in step S25, PB1 to PB are sequentially connected starting from terminal PBO.
At step 826, the state of the 7-oto coupler PH81 is input to the terminal PEO, and whether each of the I-E D701 to 708 is lit is outputted to the terminal PEO at step 826.
Judging by whether E0-PE7 is 1 or O,
If there is a burnt out LED, the contents of the D register are transferred to the trouble memory in step S27, and the number of the broken LED is memorized.

Thereafter, steps 323 to S31 are repeated in the same manner as 709.
~716,717~724,725~730 L E
Check about D. When the contents of the B register exceed 41, the process advances to step S32, and steps 833 to S43 are repeated for the LED array 800 to perform the same check as described above.

FIG. 9 is a flowchart showing details of the initial setting process for presetting predetermined numerical values in the memories Q1 to Q4 corresponding to the second magnification setting key groups 100 to 103. The numerical values preset in the memories Q1 to Q4 are the first
It is determined by the on/off state of the switch associated with the key operation shown at H) 5, 106 in the figure. By turning on and off the switches 105 and 106 in accordance with a combination predetermined by the operator, etc., and closing the initial switch, predetermined numerical values are preset in the memories Q1 to Q4.

Table 2 shows specific examples of preset values for combinations of on and off of the switches 105 and 106.

Table 2 When setting numerical values as copy magnification in memories Q1 to Q8 corresponding to selection keys 100 to 103.95 to 98, select the first
The processes shown in FIGS. 1 to 13 are executed.

In FIG. 11, in step 5IO1, 8102, when the key 99 or key 104 is operated to switch to the copy magnification setting mode, the first. It is determined for which second key group magnification setting is requested. When the key 99 is operated, the mode is the first copy magnification setting mode, and 7lag A is set to "1". When the key 104 is operated, flag B indicating the second copy magnification setting mode is set to “
Set 1. Furthermore, steps 5104, 510
In step 5, the indicator light 99a indicating the copy magnification setting mode lights up, and if the calculation flag is "0", the process proceeds to step 8106, and if the calculation flag is 1, the process proceeds to step 821.9 (first
Jump to Figure 2).

When key 99 or 104 is operated, in either case, step 5103, 810? In this step, a process is executed in which the 1000th place flag is set to "1" and the display of the 1st place is set to "0". That is, when the control of the copying machine is switched to the magnification setting mode, the numerical display device 72 displays "bbb o" (b is blank) and is in a standby state to accept input from the 1000th digit.

If the numeric keypad is operated in this state, step 5109
The type of key is determined, and the process proceeds to step 5110 to display "1" in the 1000th place only for the "1" key 80 and outside. Note that here, for convenience's sake, the numbers are 1000th and 100th due to the relationship with the numerical display device 72.

Numerical values input using expressions such as 10th place and 1st place will be explained, but the numerical value as a magnification is treated as a decimal number with 3 digits after the decimal point and 4 significant digits.

The 1000th place flag is “do” and the input value is “O”.
Or in the case of 2 to 9, proceed to step 5112 and set 100.
Display “0” in the 0th position. Next, if the input value is 0, proceed to step 5111 along with the case of [1], and set 10.
Set the 00th flag to "0" and set the 100th flag to "1" and wait for input to the 10.0th digit. If the input is 2 to 9, the 1000th place flag is set to "0" in step 5114, and the process proceeds to step 5117, where the input value is set to 100.
Display in digits.

The process described above when the 1000th flag is “1” is as follows:
This is based on the premise that numerical values in the range of 0.647 to 1.414 are treated as valid copying magnifications, and therefore only "1" and "0" can be displayed in the thousands digit. Moreover, by doing this, the key operation when inputting "0" into the 1000th digit is simplified. Note that even if such processing is executed, there may be a case where the value inputted below the 100th place is outside the range of the above-mentioned effective copy magnification. The processing at this time will be explained in the subroutine section of FIGS. 12 and 13.

When a numerical value is entered in the 1000th place digit, the 100th place flag becomes “1”, and when the numeric keypad is operated in this state, 10
A numerical value corresponding to the operated key is input to the 0th place digit, and in step 5117, that numerical value is displayed, and in step 5118, processing is executed to set the 100th place flag to "O" and the 10th place flag to "1". Ru. Hereinafter, the input of the 10th place and the 1st place are also performed by operating the numeric keypad.

The 70-chart in FIG. 12 shows the process of storing the numerical values input and displayed in the process of FIG. 11 in the memory corresponding to the selection key to be operated next.

In step 5201, first, it is determined whether the mode is the first magnification setting mode or the second magnification setting mode. Step 5201 is executed only when either flag A or B is "1", so here, for example, only the determination of whether flag A is "1" is executed, and flag A is "1". 1", it is the first magnification setting mode, so the process proceeds to step 5219 and subsequent steps to determine the operation of the first selection key group 95 to 98. If 7 lag A is not "1", that is, 7 lag B is If it is "1", Hiiragi is in the second magnification setting mode or not, and the process proceeds to step 5202 and subsequent steps in which the operation of the second selection key group 100 to 103 is determined.

In the process shown in FIG. 12, in any magnification setting mode, the displayed numerical value is basically stored in the memory corresponding to the operated selection key. However, as described above, at this stage, a value that is not within the range of permissible copying magnifications may be displayed.

Therefore, in the process shown in FIG. 12, the subroutine shown in step 5203 is executed after determining the operation of each key, so that numerical values outside the permissible range are not stored in the memory. The process of step 5203 is shown in FIG.

In FIG. 13, if the display is not "O", it is determined in step 5240 whether the displayed numerical value is smaller than 0.647, and if it is smaller, step 524 is performed.
1 makes the display 0.647.

Also, in step 5242, the displayed value is 1.4.
It is determined whether or not it is greater than 14, and if it is greater, the display is set to 1,414 in step 5243.

Therefore, to explain in relation to Fig. 12, when a predetermined selection key is operated in the magnification setting mode, if the displayed value is outside the allowable range, the display will be displayed as the allowable limit value. Stores the numeric value in the memory corresponding to that key. When the process of storing the numerical value in the memory is executed, in the case of the first magnification setting mode, the flag A is set to "0" and the process proceeds to step 5222, and in the case of the second magnification setting mode, the flag B is set to "0". Proceed to step 8206.

When in the second magnification setting mode, press the second magnification setting key group 1.
When 00 to 103 are turned on, the indicator light 99a indicating the arbitrary magnification setting mode is turned off in step 8206, and the process proceeds to step S.
20? Proceed to. When the first magnification setting keys 95 to 98 are turned on in the first magnification setting mode, the calculation flag is set to "0" in step 5222, the indicator light 99a is turned off, and the process proceeds to step 5207. Sunawamo, indicator light 99
Since "a" indicates the arbitrary magnification setting mode, when setting to the magnification key is completed, the indicator light 99a is turned off.

Steps 8207 to 5209 show processing when the clear stop key 91 (see FIG. 2) is operated. When the clear stop key 91 is pressed, step 520
8, 8209, “bbb 1” is displayed on the display device 72.
is displayed, and flags A and B are set to "0". Immediately, when the clear/stop key 91 is operated, the displayed numerical value is cleared and the magnification setting mode is canceled. Therefore, the numerical value "1" thus displayed is "1'" as the standard setting value for the number of copies.

FIGS. 14 and 15 each show a second selection key group 100.
103 and the first selection key group 95 to 98 are operated.

In FIG. 14, keys 100, 101, 102 and 1
03, the light emitting diodes 100a, 101a,
1.02a and 103a (see FIG. 2) corresponding to the key that has been manipulated is lit, and then the second CPU 20 uses the numerical value stored in the memory as magnification data.
Transfer to 2.

In FIG. 15, when any of the selection keys 95 to 98 is operated, in this case, the corresponding light emitting diode is turned on as described above, and an arbitrary magnification is set, so step 5402. S4.08, 5415 and 54
At 20, the numerical values set in the corresponding memories Q5 to Q8 are displayed on the display device 72. This display is set, for example, only when each key is pressed, and when the key is released, the number of copies set in another storage device is called up and displayed on the display device 72. There is. The numerical value stored in the memory is transferred to the second CPU 202 as magnification data.

FIG. 16 shows the original size input routine. The document size is detected by each combination of switches 601 to 606, which are arranged in advance around the document glass as shown in FIG. The combination is as per the 70-chart and is stored as the document size. That is, for example, step 5
450 is the switch (shown as SW in the drawing) 60
If it is determined that the switch 606 is on in step 5451, it is determined that the original is A4 and set in the horizontal position.

FIG. 17 shows the document illumination routine. This is an LE for lighting
Turn on the D700 at maximum light intensity, then compare the document size with the effective image area determined by the paper size and magnification, turn on the document illumination LED for the smaller portion, and scan at low speed. , a control unit that indicates an area through which the document is transmitted and which the user can copy. When the switch 108 is turned on, the on-edge is detected in step 8461, and the process proceeds to step 8462, where paper length/magnification is calculated.

The vapor length is determined from Table 3.

Table 3 The process then proceeds to step 8463, where the results are compared with those determined from Table 3. If the document length is larger, the process proceeds to step 8464, and if the document length is smaller, the process proceeds to step 8465.

Then, the shorter one is memorized as scan length data and CPt
Send to J202. 'Next step 8467
The paper width divided by the magnification is compared with the inside of the document, and the shorter data is stored as the lighting number data of the LED array 700.

and outputs a low-speed scan signal to the CPU 202.

(Step 5470) Also, the main motor starts irradiating the original at ONL step 5471.

Next, when the scanner completes the scan return and returns to the normal position, the low speed scan signal is set to C) and the main motor is turned on to end the irradiation of the FFL document.

(S472 to S4.74) Note that the CPU 202 causes the scan motor M4 to scan at a low speed if the low speed scan signal is not received. As a result, the user can recognize and remove the original transmitted by the illumination LEI') 800, albeit from the back side, and can correct misalignment of the original.

FIG. 18 shows the trouble display routine.

When the trouble memory is O, the LED has not been turned off, so the process proceeds from step 5480 to 481 to turn off the image loss indicator 111, and in step 5482, the normal selected paper size is displayed on the paper size display. When it is determined in step 8480 that the trouble memory is not 0, the serviceman call display 109 is turned on in step 5483.

The following describes a process of alternately displaying the copyable original size and the selected paper size on the paper size display section using the timer TA and timer TB.

When the time set in the timer TA ends, the contents of the trouble memory, that is, the LED numbers that are out, are 801 to 83.
If the number is 0,701 to 719, copying is not possible, so leave it as is (steps 8484→5485); otherwise, proceed to step 8486 and turn on the copyable document display 110.

If the trouble memory is 720 or 721, there is no effect on the B5 horizontal copy, so the B5 horizontal display is turned on, and if it is any other document, the missing image display 111 is turned on (steps 8487 to 8489). Below, if the trouble memory is 722-726, it is possible to copy a B5 horizontal document; otherwise, if the trouble memory is 727-730, B4. A4. If it is BS or BS horizontal, copying is possible, otherwise, the image loss display 111 is turned on. Then timer TB is activated.

At the end of timer TB, the copyable original display 110 is turned to O.
FF, the selected paper size is displayed on the paper size display 109, and a timer TA is set.

FIG. 19 shows the inter-image erase control routine.

For inter-image erase, the LED array 800 turns on all LEDs when the drum is rotating except in the image area.

When the image area is illuminated, the length where the original is not placed relative to the width of the original glass, that is, the value of the original margin divided by the magnification, is stored as lighting number data of the LED array 800.

Also, when the image defect display is 1, it means that a copy is made knowing that the exposure LED 800 is out, and the latent image on the photoreceptor drum 1 for the document to be exposed by that LED will be a black stripe. The LEI of the LED array 800 corresponding to the latent image portion of the black stripe is turned on to prevent the black stripe from occurring.

FIG. 20 shows a preliminary scan routine.

When it is detected in step 5500 that the print switch 71 has been turned on, a preliminary scan is first performed in step 5501 in order to memorize the density distribution of the document. At this point, a preliminary scan mode and a scan signal are transmitted to the CPU 202, and since exposure is performed for the width of the original, the lighting number data of the LED array 700 for the width of the original is memorized in step 5502.

Next, when it is determined in step 5503 that the scanner has scanned the original length, the scan signal is turned OFF and the copy start flag is set to 1 (step 55 (15, 8
506).

During scanning in the preliminary scan mode, the density of the illuminated original is detected by the 7-otodiode array 900, and the density distribution of the original is memorized (steps 8507 to S5'0).
9).

FIG. 21 shows the copy operation routine.

(Block 10), when the copy start flag becomes 1, the main motor, developing motor, charging, and transfer are turned off.
If the overprint paper is selected, the overprint paper roller clutch is turned on, and if the underprint paper is not selected, the underprint paper roller clutch is turned ON, and the copy flag is set to 1.
, set T-A (timer A) and T-B (timer B), and set the copy start flag to 0. (Block 11
) to judge the T-A, and when it is time to finish the T-A, turn the second lower paper feed roller clutch to O.
Make it FF. In (block 12), TB is judged, and when it is the timing for TB to end, the scan signal is turned ON. (Block 13), when the timing signal becomes 1, the timing roller CL is turned ON.
, set T-C.

(Block 14), at the timing when T-C ends, charging, scanning signal, timing roller C
Turn I- off. In (block 15), when the return signal is 1, that is, when the scanner that once left the home position returns and turns on the home position SW, the developing motor and transfer are turned off, the copy flag is set to 0, and the T- Set D. In (block 16), the main motor is turned off at the timing when T-1) ends.

(Block 17) outputs the results of the processing up to now.

The waveforms of the above operation are shown in FIG.

FIG. 23 shows the flow of timer interrupt processing started by the second internal timer of the CPU 201.

Here, each LED (701 to 701) of the LED array 700 is
The brightness of each LED is controlled by controlling each lighting tuner (730).

First, the L to be lit is set in the main routine.
Set the data of ED numbers (701 to 730) as lighting data.

Next, if the copy iso is currently in document illumination mode or preliminary scan mode, automatic illumination will not be performed, so each LE that should be lit
All D (LEDs set in the lighting data) are lit. Immediately, it lights up fully at 100% duty.

At times other than the above, that is, when illuminating a document during a copying operation, all of the LEDs specified in the lighting data (i.e., ■, ED for the width of the document) are In order to give an appropriate amount of exposure to the original pattern, each LED is turned on at each pre-calculated duty timing (counting the number of timer interruptions).

For example, an LED that illuminates a dark pattern has a high duty ratio and is fully lit, while an LED that illuminates a thin pattern has a low duty and lights up darkly.

Effects of the Invention As detailed above, in this invention, even if there is a failure in a part of the document illumination means, the document can be copied in accordance with the normal part, so that the copying machine can be used effectively. It will come off.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of a copying machine to which the present invention is applied, FIG. 2 is a plan view showing an operation panel of the copying machine shown in FIG. 1, and FIG.
The figure is a plan view showing the configuration of the original size adjustment switch.
The figure shows the LED array for document illumination and the LED array for erasing.
FIG. 5 is a circuit diagram showing an example of the control device of the present invention, and FIGS. 6 and 7 are detailed views of the LED driving portion in the circuit of FIG. 5. The circuit diagrams, FIGS. 8 to 21 and 23 are 70-charts showing the operation of the control device of FIG. 5, and FIG. 22 is a time chart showing the operation of the main parts of the copying machine. 1... Photosensitive drum, 700... I for document illumination. ED array, 800...LE for edge erase
D array, 201. 202.,CPU.

Claims (1)

[Claims] (1) Excluding the document illumination means that has a plurality of illumination lights lined up so that the lighting width can be controlled, the failure detection means that detects a malfunctioning illumination light, and the part corresponding to the malfunctioning illumination light,
1. A copying machine comprising means for effectively creating an original image on a photoreceptor.