JPS5868076A - Copying device - Google Patents

Abstract

PURPOSE:To read plural paper sizes with a small number of signal lines, by transferring the information put on a transfer material by using in common a signal line for transferring other information. CONSTITUTION:The operation part of a device is provided with reduction copying mode selecting keys 127-129, corresponding indicators 130-132, an unmagnification copying mode selecting key 122, and its indicator 121, and also the control part is provided with program CPUs 505, 506. The CPU505 is used for sequence control such as copying process operation control, etc., and the CPU506 is used for real time control such as input discrimination of a copy key, a segment display, etc. As a result, information put on a transfer material can be transferred by using in common a signal line for transferring other information.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a copying apparatus that can use transfer materials of a plurality of sizes.

In recent years, copying machines have become more and more multi-functional, and the number of transfer materials (hereinafter referred to as "transfer materials") that can be used in a wide variety of sizes has become contradictory. An example of a conventional control section of such a copying machine is shown in FIG. In the figure, 506 is a microcomputer (unit 9, θ.

~θ4 each represents a portion of the output boat. Also ■.

~Ill represents a portion of the input boat. Reference numeral 513 represents a key matrix, which constitutes a group of key switches on the operation unit for inputting various information to the copying apparatus, and the numbers and letters in parentheses represent the input information of the switches. To read the signal into the microcomputer 506,
Output boat θ. From θ to θ, the input port ■ is synchronized with the key scan signal that is sequentially output in pulse form. ~■
, and the data is decoded. 36, 3
Reference numerals 7 denote upper and lower cassette detection switches, and each combination of four switches indicates the presence or absence of a cassette and the type of cassette in the eight buildings. Each switch 5WIU to SW4U.

5WIL-8W4L has 8 first side lines 211 to 218
0 connected to the microcomputer 506 by
Each of the signal lines 211 to 218 is connected to a ground line 219 via a resistor. Therefore, when the cassette is not inserted into the cassette storage section, all 1d numbers are kept at the "'L" level, and depending on the type of cassette inserted, the sliding line of the predetermined switch is "I (" level: 'x Le.

As mentioned above, in the conventional reading circuit VC, as many capacitors as the number of switches are required.

However, in recent years, microcomputers have also become a one-chip problem.

Furthermore, the functions of photographic devices have expanded, and variable-resolution copying has become common in addition to the same size, and the direction of paper feeding has changed from the conventional single direction.
Both vertical and (yellow) directions are considered necessary, so it is necessary to distinguish between Jichi and Jyo even if the paper size is the same, increasing the number of 8i and cassette sizes.Furthermore, the ease of use of the device is increased. Therefore, there are multiple paper feed units, and the entire device is loaded with cassettes and 7L types! Full power is increased to 11. Like this.

Under the current circumstances, the conventional sword class, which includes internal organs, simply monopolizes a large number of microcomputer-powered boats. 1. In order to avoid this, if you use a dedicated expansion board element and circuit, it will increase the cost, make the parent circuit complicated, and reduce reliability.

The present invention was made in consideration of the above (I) point, and the DJ'
A capable copying machine (i74M).

FIG. 2 is a diagram 147r of a copying machine to which the present invention can be applied.

The front surface of the drum 2 is made of a three-layer seamless photoreceptor made of CdS former specialist metal. 3V starts VC rotation in the direction of the arrow. When the pre-processing rotation of tram 2, !IF, % is completed, the document 5 placed on the document table crow 4 is integrated with the first scanning mirror 6. It is illuminated by the constructed illumination lamp 7, and its reflected light is scanned by the first scanning mirror 6 and the second front mirror 8.

The first scanning mirror 6 and the second scanning mirror 8 move at a speed ratio of 1:1/2. This means that the optical path length in front of the in-mirror lens 9 is always constant (l) and the original is placed on the floor. The above-mentioned reflected light 1 dust passes through the in-mirror lens 9 and the third mirror 10, and then is imaged on the tram 2 by the exposure beam B.A. The weight is simultaneously removed from the rung 11 and the front rift remover 12i, and then the drum 2 is removed from the front part A by the front rifμ.
In the original, 50 reflection sources + 'J4 or Surin) 6 sources are added. At the same time as JL, the polarity is opposite to AC or primary (for example ■)
Corona static elimination is performed using a secondary fluorescent lamp 14, and after that, uniform surface exposure is performed using a full-surface exposure lamp 15+ to form an image on the drum 2 (V) of sieve contrast. The electrostatic m-image Vi, ?K V on 2 is the developing device 1
The developing roller 6 visualizes the toner image, and the toner image is transferred to the transfer paper at the transfer section 3 by the transfer charger 17.The transfer paper is stored in the upper cassette 18 or the lower cassette 19. It is sent into the machine from the half-moon-shaped feeder I]-ra 20°21VC, and the timing is determined by the register roller 22. Photosensitive drum 2
The tip of the above-mentioned dark/d latent image and the tip force of the transfer paper/transfer part B
will be sent to the matching ft2. Next, the transfer paper passes through the transfer section B, and the toner image on the photosensitive drum 2 is transferred onto the transfer paper.
It is separated from the conveyor belt 23 and the fixing roller 2 from the VC.
4, the paper is fixed by pressure and heating, and is then completely conveyed by the discharge roller 25 and detected by the paper detection sensor 26.
It passes through the conveyance path 28 and is discharged to the sorter 29.

Further, the photosensitive drum 2 of the photosensitive drum 2 continues to rotate completely, and its surface is cleaned by a cleaning device 30 composed of a cleaning roller and an elastic blade, and the drum advances to the next cycle. Also, the collected toner is collected in the discharged toner container 31Vc.

Next, the Vc valley detector will be explained.

Reference numerals 32 and 33 indicate paper-out detection lamps for the upper and lower cassettes, which are placed at positions that irradiate CdS 34 and 35, and are used to detect the presence or absence of transfer paper using a well-known technique that detects changes in the resistance of CdS 34 and 35. (can be detected.

In this embodiment, the lamp 32.33v''J, the two-stage cassette, and the lower cassette are located inside the copying machine 1 (/
(Controlled to emit light only when inserted. l 3
(Y, 437 are upper cassette and upper cassette size detection switches, respectively, consisting of a set of 4 444, when the selected switch is pressed by the size recognition cam V attached to the cassette, the second Eight types of size data and the presence or absence of a cassette are output as shown on the display in the operation section shown in the figure.

38 is a switch that generates a signal when the lid of the two-stage cassette 18 is used.This switch is used to manually feed the sheet from the VC into the bag printing plate 1, and then the paper feed roller 220.1/distro roller 22 is fully loaded. You can share it and make a single copy.

39 is a switch that detects the presence or absence of toner in the current toner popper; 40 is a switch that detects any overflow of toner in the discharged toner container; 41 is a disk that rotates in synchronization with the main motor 3; and a photo interrupter 42. The generated drum clock pulse is used as a reference clock for sequence control 1 of the multiple Jy device.

Reference numeral 43 denotes a first mirror to which the illumination lamp 7 and the first running mirror 6 are attached, and it reciprocates in the directions of arrows A and E on an axis (not shown) to perform optical running and fIX. Also, on the first mirror, there is a photo interrupter shielding plate 45 for determining the feeding timing and registration timing of the transfer paper, respectively.
44, and photointerrupter shielding plates 47 and 49 for determining the stop position 11 of one first mirror are attached. A photo-interrupter shielding plate (hereinafter abbreviated as Pi plate) 48 is attached to the second mirror 8 for detecting the position of the second roller 8 during full-size copying and reduced-size copying.

49i17J: A photointerrupter that detects the passage of the Pi board 44, 45, 46, and has an LED and a phototransistor facing each other.

51 is a photointerrupter that detects the position of the Pi temporary 47 and is of the same type as 49.

50.52 is a photointerrupter that detects the position of the Pi board 48, and is of the same type as 49.50. Photointerrupters 50 and 52 output an aunt representing the Pi board.

H2i indicates the same magnification copying position and the reduction copying position tt of the lens 90, respectively.

53F, the lens 9 is at the magnification level l1iffi Set it with the half metal detection switch on the Pi side.

54 is a thermoswitch for detecting the entire temperature of the fixing device 55, and is of a type whose circuit opens when the temperature is low. In this embodiment, after the main switch 56 is turned on,
31 After a certain period of time has elapsed, the state of the thermo switch 54 is judged, and if a low temperature is detected, the pressure roller 5 in the fixing device 55 is
The fixing roller is rotated for a certain period of time for the purpose of heating No. 7.

Reference numeral 58 is a switch that detects whether the cover of the copying machine is completely opened or closed.

Reference numeral 59 is a switch provided at the entrance of the printer 29 to detect all passage of copy paper.

Reference numeral 60 indicates a conveyor belt in the conveyance path 28 that guides the copy paper to the sorter 29, and 61 indicates a copy paper feeder 90-ra disposed at the entrance of the sorter 290.

56 is the main switch, which can be opened and closed manually as well as VC,
By manually applying the first gear to the trip coil, the tunkejo-go V Koyoru Of! ``F action can be performed.

This is a 62-key counter (total counter for each operator), and in the present VC, it is equipped with a short bar circuit for detecting insertion into a socket.

63 is a total counter for the number of copies.

FIG. 3 shows the operation section of a copying machine capable of reducing a document at a reduction ratio of 0.67. In the figure, 115° and 116 are keys for selecting the upper and lower cassettes, respectively, and 114 is a slide lever for setting the copy density, and position 5 is the standard density.

105 is a numerical key for setting the number of copies, 106 is a clear key for canceling the number, 102 is an interrupt key for copying another number before the copying of the set number by key 105 is completed, 104 is a copy key for commanding the start of copying, and 101 is a stop key for stopping the copying operation during continuous copying of a set number.

The stop key 101 is also a command key for canceling the mode when interrupt is selected using the interrupt key 102. 122 is a selection key for the same size copy mode, 1211'
i. This is the indicator and lights up during the 1-size copy mode. 12
4 and 126 are selection keys for reduction copying modes from B4 to B5 and from A3 to A4, respectively, and both have reduction ratios of 0.67. 123 and 125 are keys 12, respectively.
4, the mode selection midpoint is displayed on the display corresponding to 126. 117 and 118 are indicators for displaying the cassette selected by the upper and lower cassette selection keys 115 and 11.6K, respectively, and 119 is for displaying the type of cassette loaded in the selected cassette. This is an indicator. The display 119 also includes reduced copy mode keys 124, 1
If you select 26, press the cassette selection keys 115, 11
6. If the size of the cassette selected by the VC does not match the reduced size, the compatible cassette is flashed to notify the operator. Even during the blinking display, the paper size of the selected cassette is lit continuously.

111 is a display indicating that interrupt mode is in progress; interrupt key 102
The light disappears when the button is selected, and turns off when the interrupt copy is completed or when the interrupt mode is completely canceled by the stop key 101. 108 is a key counter confirmation indicator that lights up when the key counter is not inserted into the socket of the main body.

Reference numeral 109 is a discharge toner display device, which corresponds to the discharge toner container 3 in Fig. 1.
The light turns on when the container 1 is full of toner and the sensor 40 detects the toner, and turns off when the discharged toner is removed from the container.

Reference numeral 110 lights up when no cassette is inserted into the cassette stand selected by the paper/cassette replenishment indicator, or when the paper in the cassette set on the cassette stand runs out. Reference numeral 112 denotes a toner replenishment indicator, which lights up when the amount of developer in the developing device 16 falls below a specified value.

Reference numeral 113 denotes a paper feed check indicator, which lights up when copy paper is jammed inside the machine or when only one paper is jammed in the attached printer 29.

When the main switch 56 is turned on and the temperature of the fixing heater is lower than a specified value, the weight display is displayed at 103, and the light is turned off when the temperature exceeds the specified temperature and the weight-up process is completed.

Is 107 one copy? On the Fi display, use the numeric keypad 105 to press b [
When the desired number of sheets is set, the number of sheets to be set is displayed in 7 segments and 2 digits. Settings from 1 to 99 sheets at a time are iJ functions. The number of copies displayed is the main switch 56.
On Nao Toshi, or copy completion or final key selection,
1 is automatically displayed after a predetermined time has elapsed. (Hereinafter referred to as auto clear) Also, when the clear key is pressed, 1t is displayed in the same way. Furthermore, when the interrupt key 102 is pressed, the number of copies per copy is displayed in place of the number of copies that had been displayed until then, and the number of cents is displayed with sound and light by key operation during subsequent key operations in the interrupt mode. , When the interrupt mode is canceled, the number of sheets set immediately before entering the interrupt is displayed again.

FIG. 4 shows the trace selection key in the reduction copy mode of the operating section of an apparatus with an apparatus configuration capable of reduction of 0.78. 121,
122 is the same part as in FIG.

127, 128, 129 are respectively A4 to B5,
These are selection keys for reduction copy modes from B4 to A4 and from A3 to B4, and 130, 131, and 132 are indicators corresponding to keys 127, 128, and 129, respectively, and correspond to the mode selection center point.

FIG. 5 is a block diagram showing an example of the control circuit of the oral copier. In this embodiment, the program C is installed in the control section of the device.
Two PUs (one-chip microcomputers) are used, one of which is mainly used for sequence control such as copying process operation control, and the other? It is used for human-powered identification of copy keys, etc., and real-time control of segment display, etc. This makes it possible to compensate for defects such as copy control malfunctions that tend to occur when all control is performed by one program CPU.

In the figure, 506 is a CPU for performing real-time wholesale.
, and hereinafter referred to as the management CPU. Further, 505 is a CPU that performs all sequence control, hereinafter referred to as sequence CPU.

The management CPU 506 and the sequence CPU 505 perform control according to various inputs according to programs stored in advance in the built-in memo IJ ROM.

401 is an output port expansion adapter for expanding the output port of the sequence CPU 505, and 402 is an input port expansion adapter for expanding the input port of the sequence CPU 505. 0 Output port expansion adapter 4 (Jl has a paper feed roller Driver 404, illumination lamp driver 405, obi driver 406, main switch 56 trip coil control circuit 407, lens driver 408, main motor driver 409, forward latch driver 410, reverse clutch driver 411, registration roller driver 412
, a mirror driver 413, and a jam relay 414 are connected. The operations of these are controlled by signals outputted from the sequence CPU 505 via the output port expansion adapter 401.

In addition, the input port expansion adapter 402 includes a jam relay 414, a lens position signal 416 from a switch 53 for detecting the lens position, and a home position signal 4 from the photo interrupter 51 for detecting the stop position of the first mirror 43.
17. Low temperature signal 418 from the thermo switch for temperature detection of the fixing device 55, mode setting signal 419 indicating whether the device has a 1x image or reduction function, thermistor disconnection detection signal 420, lighting lamp 70 lighting detection 1M No. 4211 paper A blockage detection signal 422 and a mirror position signal 423 from a mirror position detection photointerrupter 50.52 are input, and these signals are sent to a sequence CPU 505.

A drum clock 403 from the drum clock pulse generator 41 is also input to the sequence CPU 505 .

436 is a blank lamp control driver; 437 is a switch for detecting overflow of discharged toner; 438 is a switch for detecting toner in the developer hopper; 439 is a driver for controlling the total counter 63 and key counter 62;
40 is a power-on detection unit, 441 is a control CPU provided in the sorter 29 connected to the device, and 442 is a fixing device 5
5 is a heater control circuit; 434 is a device abnormality detection circuit;
435 is a reset circuit for returning the control section to an initial state. These are the sequence CPU 505 and the management CPU
Connected to U 506.

The management CPU 506 inputs a signal 426 from a switch for detecting the cassette size inserted into the apparatus to the size detection section, and a signal from the key matrix 825 for detecting the human force on the keys of the operation section. Also, a key counter detection signal indicating whether or not the key counter 62 is installed;
The heater detection signal of the fixing device 55, No. 48 from the manual feed detection switch 438, etc. are also input. Then, lighting control of each display 424 of the operation unit, manual feed display driver 427,
Paper/cassette replenishment indicator driver 428, exhaust fan motor driver 430, and interrupt indicator driver 433
Outputs drive signals according to various inputs.

The management CPU 506 controls the sheet number setting No. 1 on the operation panel (Fig. 2).
\ Constant key 105, reduction selection keys 128, 130, 13
2. Cassette i selection keys 115, 116, interrupt keys 127, 129, 131, cassette stage display 1
17 degrees, 118 degrees, etc. are displayed dynamically. In addition, the compatible cassette is displayed blinking by pressing the selected mφ selection key.
In addition, the cam attached to the cassette has 4 push buttons S.
Cassette size detection unit consisting of W) 36.37
The cassette size is read and dynamically displayed on the display 119.

Pu Also, the management CPU 506 is connected to 505 and 4 during the sequence.
bit signal, ■■■■502 and 4 bit signal■■■
■ Information is exchanged at 501, and when the copy key is pressed to select the copy mode (for example, the reduced copy mode with upper paper feed in an A3 cassette) determined manually by the key described above, the signal ■■■ The copy counter 107 is decremented by the ■■■■ signal transferred from the C[-)c node e1m, and the display 107 causes a jam.
Displays the status or abnormality detection status.

Next, the programs stored in the management CPU 506 will be explained with reference to FIGS. 6-1 to 6-3. This program includes a JAM correction routine, a key sense routine, a key decoding routine, a copy counter subtraction routine, and a cassette and paperless reading routine. It consists of a scan (11th order set run) and a display routine.

Each routine will be explained in detail below.
3 bi of ■■■ based on the ■signal sent during EC
The reduction ratio of the optical system attached at the t signal (e.g. Eva 0.64,
Enter information such as 0.67, 0.78% times m), cP(,
1 and memorize the key until it is reset again. Seven winters step 800 is an error (from EO to
This routine sets display data for displaying 7) on the 7-segment number display 107 as, for example, E3. The occurrence of an error is confirmed by the signal line 509.
It is input to the interrupt terminal of 雈′, and - (EO~EV)
is placed at the Buddhist altar by the ■0■ signal. The signal 509 also turns off the fuser heater to prevent fuser burnout and fire in the event of an abnormality.

Step 802 detects all on/off states of the main switch and electrolytic corrosion (+246) associated with opening/closing, and if it is on, the process branches to step 803 and a thermistor @ line abnormality (E
If an abnormality other than O) is detected, the process branches to step 804, and the function stop caused by the abnormality detection is canceled. If the thermistor is disconnected, the function will remain stopped and will not be reset unless CI)U is reset by unplugging the plug from the outlet, etc.

CP (/ Step 805 is a pulse generation routine to detect runaway due to destruction during management, etc., and outputs a predetermined pulse at a constant cycle, and if the pulse is not continuously output within a fixed period of time, , is detected by the runaway detection circuit 434 and the microcomputer is reset.

CPυ The input to the abnormality detection circuit 434 is from 505 during the sequence to the drum clock (jυ), and during standby, the pulse I'Pt, / is distributed by the internal timer, while during the -tt, when the main switch is off, the above pulse is applied, and when it is on, a digit signal for dynamic display, which will be described later, is applied (if both signal levels do not reverse within a predetermined time), and the both θ hold expansion adapters 401 are reset. to prevent unexpected load damage.

If there is no jam in step 806, the number display is reset to 1, and if the main switch remains off for 15 minutes, the fuser heat exhaust fan 66 is turned off.This fan is turned on at the same time as the weight is increased. The purpose is to prevent toner welding (blocking phenomenon) near the fuser, especially inside the waste toner collection container 31, and if noise when the main switch is turned off is a problem, the changeover switch can be used to synchronize with the main switch. It is also possible to turn it off.

On the other hand, if the main switch is on, step 80
2, the process branches to step 809, and if it is detected by the heater detection signal 511 that the heater is turned off, the wait is increased and the aforementioned fan 66 is turned on.

Next, I will explain the JAM correction routine.
■1d No. 2 bit is stored as the number of tickets staying in the aircraft (for example, 2). In step 811, since the jam relay is not set (meaning the end of JAM processing), the process branches to step 812, and if the copy mode data has not been saved, the copy mode and display (for example, upper A3 Cassette, in dairy small mode,
(The number of sheets is 5) is stored in the loss W until the jam processing is completed. Next, in step 812, the process branches to step 813 again, and in step 810, the number of sheets stored in the cabin is displayed on P (
For example, display data is set as P2).

If it is confirmed in step 811 that the jam processing has been completed, the process branches to step 814, and the saved display data is restored in order to return the display to the copy mode immediately before the jam occurred.

However, if the jam processing that occurred just before the middle row 1 of the previous copy using the interrupt key has been completed, the interrupt display is completely turned off in step 815 and the interrupt key is canceled by returning to the copy mode immediately before the interrupt. If the last copy paper is jammed and the jam processing is completed, the interrupt display is turned on in step 816 to return to the interrupt copy mode again.

The value added to the number of sheets to be displayed immediately before the occurrence of the jam returned after the jam reset, with ■■ as a jam correction value (for example, 1) (if the normal position is exceeded, only the number of sheets that exceeded) is set as display data.

With the above control, the movement of the number display when a jam occurs is, for example, 59P2+light off (the door is opened to clear the jam and the display is turned off)+6.

In addition, in state P2, the jam will not be cleared if the main switch is turned on and off, but the jam relay will not release (when the main switch is turned on).
If the jam is not released (by the jam reset lever), the jam state is maintained and the jam display and P2 display continue.

Next, the key sense routine will be explained.

In step 819, it is determined whether or not the main unit has stopped functioning due to abnormality detection. If not, the process branches to step 821 and sequentially outputs key scan signals. If there is no key power, the process branches to step 822 and the switch is turned off. If the chattering C1'JT is not 3, this CNT't is incremented by 1 and the auto clear timer (approximately 60 SEC) starts counting. When the counter reaches 3, it is assumed that the key is correctly off (to prevent off-chattering), and all key inputs are permitted.

On the other hand, if a key input is detected in step 821, the key scan is stopped midway and the process branches to step 823.

In step 823, if the above-mentioned key manual power is permitted, the key-on chattering counter' (i-1) is incremented to prevent on-chattering.If the on-chattering CNT reaches a predetermined value, it is assumed that there is accurate key manual power, and the automatic In order to set the shutoff timer, the sequence CP'U 505 is informed that key power has been applied, and the value of the key scan described later and 4 bits are sent.
Keyword by input value (5 set by each key)
bit value).

If the input key is not accepted, the process branches to step 824, and the setting +[1
Turn off the interrupt display and set the initial settings.
-Move to Figure 2.

On the other hand, if the input key is used, the process moves to a routine for decoding the keyword.

Describe the key decoding routine. In step 825, if the interrupt key is manually operated, the interrupt copy mode indicator 1
02 lights up. If it is a stop key, copy command■■
■■Reset the signal and branch to C in Figure 6-2. If copying is in progress, the process similarly branches to FIG. 6-2C at step 826, exits from the key release routine, and invalidates the input key.

In step 828, when an input key accompanied by a display is input, display data corresponding to each manually-operated key is set, and the process branches to FIG. 6-2 (2). Incidentally, if it is not decoded in step 828, this means that there is some manual effort using the numeric keys, and the process branches to step (2) in FIG. 6-2 to set the number of sheets. First, if two digits of the two-digit number display have not been input yet, the process branches to step 830. If the second digit is not input, it is the first digit, so the process branches to step 831, and the first digit is 0g. The input is invalidated, and if the other keys are manually input, blank display data is set in the second digit in step 8:32, the input keyword is set as the first digit display data in step 831, and in step 832, from the second digit Set the display data to +5 pins 1. a. If it is determined in step 830 that the entered key is in the second digit (the first digit has already been input), the process moves to step 835, where all the already set first digit display data is transferred to the second digit, and
Set the input data as the 1st digit clothing data. Further, in step 832, the set value is set equal to the display data to 1.
Remember yourself.

If the upper cassette is selected in Figure 6-2 (■), and the hand-held Rikishit is detected by all microswitches, the set value and display number are permitted in step 833, and the number of copies to be made for the next copy without manual input of the clear key. Settings are possible.

On the other hand, if a falling edge of the ■ signal is detected in step 836, the process branches to step 839, and if subtraction is permitted, subtraction is performed on the two-digit display data. Note that the second digit is 0
is replaced with blank data in order to suppress it. When the first digit of the value subtracted in step 840 is 0 and blank data is set in the second digit, it is assumed that the copy has ended and the copy stop process of step 838 is performed. Let's do it.

Next, the cassette reading and scan command setting routine will be described.

In step 841, the scan command for reading the cassette size reading switch state of the selected stage as a 4-bit code is fully output. Further, only when the upper cassette is selected, the presence or absence of a manual feed tray is detected by a microswitch, and display data for lighting the manual feed copy mode display 120 is set.

In step 842, a paper empty or a cassette empty is checked using the 4-bit signal inputted by the above-mentioned scan command, and the paper empty indicator 11o is turned on. -Also, the detected cassette size is divided into two, and a size signal is sent (1 for large size, and if there is no paper in the small cassette, this size signal is inverted).

In step 843, if the detected cassette size is B size (A4R, B5R, B4, B5), a B size blank signal is outputted only during copying to prevent unnecessary toner from adhering outside the transfer area. In addition, in modes other than manual copy mode, display data is set to light up the display 119 corresponding to the read cassette size.

In this embodiment, the original exposure scan width is B5 cassette with a reduction ratio of 0.78 when Use is selected! If you select 1\, the maximum original size that allows the reduced image to be completely transferred to B5 size horizontally fed paper, A4 paper size.
Decided to scan.

As mentioned above, step 844 is a routine that determines the scan width according to the selected cassette size (even if the paper size is the same, there is a distinction between vertical and horizontal feeding) and the reduction ratio. This prevents the copy speed from decreasing. Scan width is 2 bi
t is encoded and set in the RAM as scan command data using all the aggregators. Note that when the manual copy mode is selected, the A3 size is used regardless of the selected cassette.

Next, the combination cassette blinking routine will be explained.

In this embodiment, as shown in FIGS. 3 and 4, the operation section has a plurality of reduction mode selection keys. Reduced copy from B4 to B5 to A4, and the reduction ratio in Figure 4 is 0.78, so the mode is A3 to B4, B
4 to A4, A4 to B5 1)\ A table reduction copy is considered, and the keys 126, 124 and 129, 128, 127 are used to select the selected cassette for each) It has the function of flashing the appropriate cassette indicator in 119 in the figure to notify you when the cassette is not in the correct state. Step 845 in Figure 5-2 is a routine that blinks the compatible cassette for the purpose described above.
3->B means 4 mode.

In this embodiment, it is possible to copy even if a cassette that does not match the compatible cassettes is selected, and by using the blank space that will not be transferred or by moving the document]1\\, you can reduce the size of the copy to only the necessary image area. becomes possible. In FIG. 6-3, step 846 is a routine for detecting a wait-up, in which the main switch and door switch are turned on, the temperature of the fuser roller rises to a predetermined temperature, and the constant heater is turned off (during a wait). The power lamp blinks to indicate that it is waiting, and the copy is stopped.

Step 847 is a routine for outputting the above-mentioned command data (scan command data upper/lower stage selection and 4-bit signal) according to the copy command, and all of these signals are reset by resetting the copy command.

Further, step 848 sends a signal (BC
When copying is interrupted due to empty paper or jam, the V sorter bin is prohibited from returning to its initial position. After passing through the entire display subroutine for dynamic display written in step 849, the program returns to FIG.

Next, the cassette size and key manual reading circuits 425 and 426 shown in FIG. 5 will be further explained with reference to FIG.

In the figure, the parts with the same strange rocks as in Figure 1 are the same structural members. Reference numeral 513 is a key matrix circuit, and the valley switches correspond to each switch on the operating section in Fig. 3, and the numbers and letters in parentheses indicate the 4! fl
I wear similar clothes. Further, 36 and 37 are upper and lower cassette detection switch groups, respectively, and the cassette size shown in Table 1 is represented by the combination of the pressed switches.

The management CPU 506 uses the output port θ as described in flowchart 1 above. ~θ4 The signal for key scan and the signal for cassette size scan are output from port θ1. It outputs sequentially in a pulse form from θ6 to the output port θ. ~θ. The input port I is synchronized with each pulse of
. The signals of ~■, are being read. Further, although the cassette size detection switch is continuously pressed while the cassette is being pressed, each signal can be correctly read by the signal loop prevention diode 228 without looping around each other.

As described above, according to the present invention, there is no need for a dedicated input port conventionally provided for reading cassette sizes, and the circuit can be configured very simply.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a control section of a conventional copying machine, FIG. 2 is a block diagram of a copying machine to which the present invention can be applied, and 6-1 to 6-1.
6-3 is a control flowchart, and FIG. 7 is a block diagram showing a circuit for reading the cassette size according to the present invention. In the figure, 36 is an upper cassette detection switch, 37 is a lower cassette detection switch, 505 is a sequence CPU, 5
06 is a management CPU, and 513 is a key matrix. Applicant: Canon Co., Ltd. L! ! '+i

Claims (1)

[Scope of Claims] (11) A copying apparatus capable of selecting and using transfer materials of a plurality of sizes, characterized in that information transmission regarding the transfer material is performed by sharing a signal line for transmitting other information. (2. A copying apparatus according to claim 1, characterized in that the other information is information generated by key manual input.