JPH022142B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a copying apparatus that forms a variable magnification image on a photoreceptor.

[Prior Art] Conventionally, in order to synchronize the exposure scan of a document and paper feed, and to align the position of the image formed on the photosensitive drum and the transfer paper, an optical system and a reciprocating member such as a document table are moved. There was a method to install a sensor and operate the resist.

In addition, in a copying machine having a variable magnification function, the magnification in the document scanning direction is changed by changing the speed of the optical system, but in this case, it is necessary to provide a registration sensor position for each magnification change.

However, when a large number of sensors are provided on a scanning path, negative effects such as decreased reliability, complicated wiring, and increased cost occur.

There have also been proposals to perform registration control using a conventional timer. (Japanese Unexamined Patent Publication No. 116833/1983,
(Japanese Unexamined Patent Publications No. 53-126931, Japanese Unexamined Patent Publication No. 54-72039) However, in this case, a highly accurate and accurately operating timer must be provided, which increases the cost of the device.

[Objective] The present invention has been made in view of the above-mentioned points, and it is an object of the present invention to provide a copying apparatus in which registration control can be performed accurately and with a simple configuration when performing a variable-magnification copying operation.

That is, the present invention includes a reciprocating member that reciprocates to expose and scan an original, and an electrostatic latent image that is formed on a photoreceptor according to the original image exposed and scanned by the reciprocating member. various process means for forming a toner image on the photoreceptor by developing the toner image and transferring the toner image to a conveyed transfer material; A comb member including a plurality of comb parts provided at corresponding positions, and a pulse signal that generates a pulse signal when the comb member moves and each of the plurality of comb parts reaches a predetermined position. a generating means, a conveyance means for conveying a transfer material to a transfer position, an input means for selecting a copying magnification, and a copying means for performing a desired variable magnification copying operation in accordance with the copying magnification inputted from the input means. control means for controlling the speed of the reciprocating member and controlling the conveying means based on the input copying magnification and each of the pulse signals; a scanning speed changing means for changing the scanning speed of the reciprocating member; a counting means for counting respective pulse signals corresponding to each copying magnification generated by the pulse signal generating means; A copying apparatus is provided, comprising a conveyance timing control means for detecting that the counting means has counted a number of pulses corresponding to a copying magnification inputted by the input means, and causing the conveyance means to start conveying the transfer material. It is something.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view of an example of a copying machine to which the present invention can be applied, and its structure and operation will be explained.

The surface of the drum 1 is made of a three-layer seamless photoconductor using a CdS photoconductor, is rotatably supported on a shaft, and is rotated in the direction of the arrow by a main motor 21 activated when the copy key is turned on. Start.

When the drum 1 completes a predetermined rotation and potential control processing (preprocessing) described later, the original placed on the original platen glass 36 is illuminated by the illumination lamp 23 integrated with the first scanning mirror 24, The reflected light is reflected by the first scanning mirror 24 and the second scanning mirror 25.
is scanned. By moving the first scanning mirror 24 and the second scanning mirror 25 at a speed ratio of 1:1/2, the original is scanned while the optical path length in front of the lens 30 is always kept constant.

The above reflected light image shows the lens 30 and the third mirror 2.
6. After passing through the fourth mirror 27, an image is formed on the drum 1 at the exposure section.

The drum 1 includes a pre-exposure lamp 8 and a pre-neutralizing charger 2.
The charge is simultaneously removed by the charger 3, and then the charge is corona charged (for example, +) by the primary charger 3. Thereafter, the drum 1 is subjected to slit exposure with the image irradiated by the illumination lamp 23 at the exposure section.

At the same time, a secondary charger 4 performs AC or corona charge removal with a polarity opposite to that of the primary one (for example -), and then a high-contrast electrostatic latent image is formed on the drum 1 by uniform surface exposure using a full-surface exposure lamp 9. do. The electrostatic latent image on the photosensitive drum 1 is then developed by a developing roller of a developing device 7 and visualized as a toner image, and the toner image is transferred by a transfer charger 5.

Upper cassette 13 or lower cassette 14
The transfer paper inside is sent into the machine by a paper feed roller 11 or 12, and is sent in the direction of the photosensitive drum 1 by a register roller 15 with accurate timing.
The leading edge of the latent image and the leading edge of the paper can be aligned at the transfer section.

Next, while the transfer paper passes between the transfer charger 5 and the drum 1, the toner image on the drum 1 is transferred onto the transfer paper.

After the transfer is completed, the transfer paper is separated from the drum 1 by a separation belt, guided to a fixing roller 19 by a conveyor belt 17 via a paper detection sensor 16, and fixed by pressure and heat, and then transferred to a discharge roller 42.
The paper is discharged to the tray 34 via the paper detection sensor 18.

Further, 29 is a conveyance fan for reliably conveying the transfer paper. Further, after the fixing is completed, the fixing roller is cleaned by the web 20.

After the transfer, the drum 1 continues to rotate, and a cleaning device 6 consisting of a cleaning roller and an elastic blade cleans the surface of the drum 1. The recovered toner is collected in a discharge toner container 43 through a pipe 45, and the process proceeds to the next cycle. .

(Operation unit) FIG. 2 is a plan view of the operating section.

In the figure, 55 is a key for selecting the upper and lower cassettes, 54 is a slide lever for setting copy density, and position 5 is the standard density.
53 is a numerical key for setting the number of copies; 7
1 is a clear key for canceling the numerical value; 51 is an interrupt key for copying another number before the copying of the set number by key 53 is completed;
52 is a copy key for commanding the start of copying;
50 is a stop key for stopping the copy operation during continuous copying of the set number; 57, 58,
59 is a key for selecting the same size copy, enlarged copy, and reduced copy; 60 to 62 are indicators for displaying the selected reduction ratio; and 60 is a key for displaying the selected reduction copy mode. 61 displays the enlarged copy mode, and 62 displays the same size copy mode. There are five modes for enlargement: a mode for converting A size to B size, and a combination of reduction ratios of 1:0.67 and 1:0.79 and appropriate cassette selection. 72 displays the upper and lower stages of the cassette selected by the cassette selection key, and 56 displays the type of cassette loaded in the selected stage. Also, when the reduction key 59 is turned on, cassettes whose reduced size and sheet size match are displayed blinking when the selected cassette does not. At the same time, the size of the previously selected cassette is also statically displayed.

63 to 67 are warning indicators from the main body, all of which are displayed as pictograms. 63 is a paper feed check indicator that lights up when copy paper is jammed inside the machine. Reference numeral 64 lights up when there is no cassette in the cassette stand selected on the paper/cassette replenishment indicator, or when there is no paper left in the cassette set in that cassette stand. Reference numeral 65 denotes a discharged toner full indicator, which lights up when the container 43 is full of toner that has been used once and collected in the copying machine. Reference numeral 66 indicates a developer replenishment display, which lights up when the amount of developer in the developing device falls below a specified amount. Reference numeral 67 is a key counter confirmation indicator, which lights up when the key counter is not inserted into the socket of the main body.

70 is a weight indicator. This display lights up when the power switch is turned on and the temperature of the fixing heater is lower than the specified value, and when the temperature exceeds the specified value,
The light turns off when the wait UP process is completed.

Reference numeral 68 denotes a copy number display, and when the desired number of copies is set using the numeric keypad 53, the set number of copies is displayed in seven segments. It is possible to set 1 to 99 sheets at a time. Approximately 60 seconds have elapsed since the end of copying, or by pressing the clear key 71 or the interrupt key 51, the set number of sheets and number of copies will automatically return to 01. 68 is an interrupt indicator that lights up when the interrupt key is pressed and goes out after the interrupt key is pressed.

(Control Circuit) FIG. 3-1 is a control circuit diagram of the copying machine shown in _FIG . ,69,
Q 72 is a microcomputer (hereinafter referred to as a management computer) that controls display operations and the start of copying operations, etc. _Q101 is a microcomputer (hereinafter referred to as a sequence computer) that controls the drive of the main motor, high voltage transformer, etc. for executing the copying process. ). Q ₁₀₂ is a ROM memory that stores the programs shown in the flowcharts of Figures 6-1 to 6-4 in the form of command word code routines, process timing data for sequence control, the number of copy sets and copy counts by key 53, and key 57. 59, size data from the cassette sensor, count number at the time of interrupt emergency copying, cassette stage save data, etc., RAM memory, I port, O port and I/O port that control input and output.
The ROM program is read by the O port and the clock O of the clock generator 700, and the ROM,
CPU that processes I/O and processes programs
This is a one-chip microcomputer that has the following functions in one chip semiconductor. Q ₁₀₁ is also a one-chip microcomputer similar to Q ₁₀₂ , and the ROM memory stores programs shown in the flowcharts of FIGS. 7-1 to 7-6. _Q103 to _Q105 are ports for expanding the five I/O ports of each computer to 13, etc. as shown in the figure. Reference numeral 800 corresponds to the circuit of each display of the operation unit and is connected to the Q ₄ and Q ₅ ports of the management computer, and 801 corresponds to the input circuit of each key and is connected to the i ₅ port. 802 is the key matrix 801 and the display system 80
A clock pulse generator for creating a zero scanning probe signal (digit) connected to the program interrupt port of _Q102 . This pulse is frequency-divided and a repeated signal is output from port _Q4 . 803 are two switches that detect the position of the lens system and operate according to lens movement;
30-1 in Fig. 1 by the combination of two switches.
When , a signal for equal magnification is output, when it is 30-2, it is enlarged, when it is 30-3, it is reduced, and when it is 0.79, a signal for 0.67 is output for Q ₁₀₅ . 804
These are four switches in each of the upper and lower rows that are operated by the cams of the cassettes when the cassettes are turned on to detect the size of the cassettes 13 and 14, and the display 56 is activated by the on/off combination of three of the four switches. Eight types of size data shown in are output. 806 is a switch 4 that operates when a sheet is manually inserted from above the lid of the upper cassette 13.
1, the roller 11 is shared for this sheet.
Execute copying. The sequence for this corresponds to the hand pointing case in FIG. 4-2. 807 is a switch for detecting the absence of toner in the developing device 7;
8 is a switch that detects the presence or absence of a key counter (total counter for each operator) and detects contact failure, and drives the display device by a circuit not shown. 80
Reference numeral 5 denotes a lens motor circuit for setting the previous lens system to a desired position in accordance with input for changing magnification, etc., and is controlled in accordance with the selection key 59 and position detection switch 803.

809 is a line for data exchange between the computers Q ₁₀₁ and Q ₁₀₂ , and arrows correspond to data requests and data directions. 810 is a clutch circuit for turning on the registration roller; 811 is a clutch circuit for inverting the mirror system to return after exposure; 812 is a developing device motor drive circuit; 814
815 is a high voltage transformer circuit such as a primary corona, and 815 is a switch installed at the mirror reversal position for the above reversal.
816 is a switch that generates a timing signal for register feeding; 817 is a home switch that is turned on when the mirror system is at the stop position; and 818 is a drum clock consisting of a photointerrupter that generates pulses by the rotation of a disk coaxial with the main motor. A pulse generator 819 is a main motor circuit for rotating the drum, to which the clutches described above and below are connected for power. Reference numeral 820 denotes a circuit for the lamp 10 which is controlled by the timing as shown in FIG. 4-2, and is turned on in a substantially opposite relationship to the exposure lamp 23. 821 is a mirror system which is moved for exposure scanning; 822 is a circuit for the exposure lamp 23; 823 is a circuit for turning off the fixing heater when an abnormality is detected in the machine; 824 is a clutch for turning on the cassette roller 11 or 12;
25 is a circuit for increasing the key counter, and 826 is a circuit for detecting a jam in the sorter 46, which outputs a jam signal when a sheet presses the switch 47 provided at the entrance of the sorter in Fig. 1 for a longer time than specified. . 827 is a mechanical latch relay that is set when the main body or sorter is jammed, and the sequence computer _Q101 reads the status of this relay through the _i4 port of _Q104 . By releasing this relay, the copy blocking state is released, and the display of the number of jam losses on the display 68 is reset, and the number of losses is subtracted from the original number of copies and displayed.

This display 68 initially displays "01", displays the input number at key input, and when copying starts, displays the number subtracted by one from that number each time paper is fed. At the final scan reversal, the original input number is displayed again to facilitate re-copying the same number. After 60 seconds, it returns to “01” again.

During copying, abnormalities in the forward and reverse clutches (the mirror does not reach the specified position at the specified time even though control output is performed), abnormalities in the drum clock pulse generator 818 (pulse intervals are longer than specified), temperature of the fixing heater The control thermistor may cause problems such as disconnection.
When Q ₁₀₂ is detected, the number display 68 displays an error message "E1"..."E3" to identify the trouble. By repairing that part, the original number before switching is displayed.

Also, if a signal indicating that the sorter is ready is not obtained from the sorter 46, "EO" is similarly displayed. This display reset is also the same as above.

Also, when a jam occurs, the sequence computer
Sheet sensor 16 input to _i5 port of Q ₁₀₁ ,
18 sends jam data to Q ₁₀₂ via 809. Q ₁₀₂ determines the number of jam losses as 1 for the former and 2 for the latter, and displays them on the display 68 as "P1" and "P2". Similarly, “P0” is displayed during sortage jam.

In this example, reduced copying can be performed regardless of the cassette size, but it is not completely unrelated to the size detector 804, and is limited to only when reducing or equal size is selected.
Only when the size is not appropriate, the display 56 blinks to indicate the appropriate size. The sheet size that is being copied in parallel is also displayed. This has made it extremely safe to handle. The enlarged copy always scans B4 size strokes in consideration of the use of partial enlargement, so it is not displayed, but it is also possible to display whether or not it is appropriate.

In addition, in this example, in the case of enlarged copying, the scan stroke corresponds to the B4 size, which is one size before the maximum cassette size, instead of the A3 size, but if the enlargement ratio is higher, the scan stroke corresponds to the n-th lower size from the maximum, such as A4 size. It can also be made to correspond to Furthermore, if the enlargement is performed in a plurality of modes, a lower size such as the n-th or n+1-th size may be selected. These can reduce wasteful scanning movements as much as possible and increase the speed of repeated copying of enlargements.

(Display Circuit) Next, the display circuit 800 will be explained using FIG. 3-2. This circuit is a circuit diagram corresponding to the operation section 501 shown in FIG.

This circuit is connected to the DC controller board equipped with the microcomputer Q102 shown in Figure 3-1, and the key scan probe signal
Digit1~6, key scan output signal KEY0~3,
Digit signal for dynamic display JD-1, 2,
4, 5, 6 Furthermore, each terminal of the dynamic display segment signals SEG-a to SEG-g is connected to Q102.

Furthermore, regarding the relationship with FIG. 2, the light emitting diode LED801 for displaying two-digit seven-segment numbers is as follows.
Light emitting diode corresponding to copy number display 68
LED802~LED808 and LED818,81
9 correspond to the cassette size display 56 in FIG. 2 with the same names. light emitting diode led
809 to LED815 are reduced in Figure 2,
The same name corresponds to enlargement and same-size selection displays 60, 61, and 62. However, M in FIG. 3-2 represents enlargement, and 1:1 represents equal magnification. Further, the light emitting diodes LEDs 816 and 817 correspond to the upper and lower stages of the cassette upper and lower stage selection display 72, respectively. These display elements LED801 to LED819 are JD-1
As each digit signal from JD-6 to JD-6, a +24V power supply is sequentially applied in a pulsed manner in the illustrated combination, and as each segment signal from SEG-a to SEG-g, in the similarly illustrated combination,
0V power is selectively applied to dynamically light up.

(Control operation) Operation time charts in Figures 4-1 and 4-2,
The control operation will be explained with reference to the control flowcharts shown in Figs. 6-1 to 6-4 and Figs. 7-1 to 7-6.

As a cycle executed prior to the above-mentioned copy cycle, there is a step of increasing the temperature of the fixing device while keeping the drum 1 and the fixing device 19 stopped after turning on the power switch SW1. (Figure 4-1,
Power switch on flow 70, 7 in Figure 7-1
1) This is to prevent the toner from solidifying in the fixing device until the temperature of the fixing device rises to a certain level, which could damage the fixing roller 19, and to raise the temperature more efficiently. It is.

(Pre-rotation, control circuit, post-rotation) Next, when the temperature of the fixing roller 19 exceeds the first set temperature, the main motor 21 is rotated at a low speed, and at the same time, the entire surface exposure lamp 9, the pre-exposure lamp 8,
The blank exposure lamp 10 is turned on to start irradiating the drum surface, and while the drum 1 rotates once, high voltage is applied to the secondary charger 4 and the light irradiation rotation continues until the second set temperature is reached. Yes (steps 72, 73). As a result, when the temperature of the fuser exceeds the first set temperature, the toner is melted and will not damage the fixing roller 19, so the temperature distribution of the fuser is made uniform, and the secondary charger 4 charges the drum 1. The residual charge on drum 1 is removed, and the drum 1 is rotated by light irradiation.
To reduce optical memory, the drum surface is cleaned by a cleaner 6. In Figures 4-1 and 4-2,
The dotted line in the main motor indicates low speed, and the solid line indicates high speed. It detects whether the rear door of the machine is opened or closed during a wait, turns off the wait lamp when it is opened, and waits for a copy start command to be input.

Further, until the temperature rises to the second set temperature, the lower fixing roller heater 32 is also turned on, contributing to the temperature rise.

Next, when the fixing roller reaches the second set temperature, the main motor 21 starts rotating at high speed and high voltage is applied to the pre-static eliminator 2, primary charger 3, secondary charger 4, and transfer charger 5 at high speed. A value suitable for the rotation is added and the drum rotates once. This is called anterior rotation (74, 75).
This is to apply high pressure to the entire surface of the drum 1 after various high pressures have been applied. In addition, when switching the drum speed, turn off the low speed signal to the main motor,
Q101 outputs a high-speed signal every 30 msec (73-2, 73-3). This prevents switching shocks.

At the same time, if the position of the lens 30 is not at the position (30-1) for performing the same-size copy, the lens 30
Start moving to the same size position (76). Next, when the drum 1 completes one revolution, the potential sensor 44 measures the drum surface potential (referred to as VSL) with the blank exposure lamp turned on, and then the drum surface potential (referred to as VSL) is measured with the blank exposure lamp 10 turned off. Measure the surface potential (referred to as VD). Based on the values of VSL and VD, the high voltage current flowing through the primary charger 3 and secondary charger 4 is controlled so that it approaches predetermined VD and VSL. Repeat this control several times (77).

Next, when the position of the lens 30 has reached the same magnification position (30-1 in Fig. 1), the original exposure lamp 23 is turned on, and the standard white plate 35 is illuminated with a reflectance corresponding to the white background of the original. , the potential on drum 1 (VL
) is measured by the potential sensor 44.
By measuring VL, the optimum image can be obtained at the "5" position of the density adjustment knob 54.
The lighting voltage of the original exposure lamp 23 is shifted.
This VL measurement control is repeated several times to optimally control the shift amount of the lighting voltage of the document exposure lamp 23. Finally, VL is measured and the developing bias of the developing device 7 is set to the optimum value.

As described above, by measuring VSL, VD, and VL (collectively referred to as potential control), the amount of charge on the high-voltage drum 1, the light amount of the exposure lamp 23, and the developing bias are controlled, and the optimal image is created. It is configured so that it can be done. Then, when the VL is measured and the control ends, the wait ends and copying becomes possible (78).

Further, as a cycle after the control rotation or after the copy rotation is completed, the drum 1 is rotated and the residual charge and memory on the drum are removed by the secondary charger 4,
There is a step of cleaning the drum surface (hereinafter referred to as post-rotation). This is about 1/5 rotation using only the secondary charger 4, and about 1/2 rotation with the voltage applied to the secondary charger 4 being weak. After the copy rotation is completed, the paper is rotated only by light irradiation until it is ejected.

The purpose of this post-rotation is to leave the drum 1 electrostatically and physically clean. After the post-rotation is completed, the drum stops and the fuser lower heater 3 is turned on again.
2 lights up, and the fusing roller is controlled by the thermistor 34 to be maintained at the third set temperature (steps 570, 571 in FIG. 7-5).

After that, if it is left unused for 2 hours without doing anything, the main SW2 will automatically shut off.
Turned off (572).

Before auto-shutting, when each key is operated, the management computer sets each data.

(Copy operation) The copy key is pressed and the data is transferred to sequence Q1.
If transferred to drum 1, depending on the time
The pre-processing before starting the copy operation described above changes depending on the stop time (leaving time) and variable magnification mode (573, 574).

The differences in this preprocessing are listed below.

(1) Leaving time 60 seconds or less If the variable magnification mode is changed, the developing bias must be changed by measuring VL.

If there is no change in magnification mode, there is no potential control.

(2) Standing time 60 seconds or more Control the optimum value of image formation by measuring VSL, VD, and VL.

After the above preprocessing is completed, the copying operation shown in FIGS. 7-1 B and C begins.

That is, even if a variable size copy is to be made, if the start time is 60 seconds to 2 hours, the drum is operated at high speed in advance and then switched to low speed. Thereby, the above-described preparation process for the drum can be carried out sufficiently in a short period of time.

When the same size data and copy start command are sent from the management computer Q102, the sequence computer Q101 judges this (via 78 and 79 when in B mode, and via 77 when in C mode), and make it faster. When changing magnification (reducing or enlarging), delay the drum by 30ms to make it slower (80). Next, as in step 81, the process is turned on and a lens movement permission signal is sent to the management controller Q102. Q102 receives this and sets the lens at a desired position according to the control operation shown in FIG. 6-4. In this way, since the lens is set only after copying is started, unnecessary lens operation due to zooming is avoided. Therefore, abnormal noise caused by lens movement can be reduced, and shocks can be prevented as much as possible. In this example, this is performed when an emergency copy is performed by interrupting copying, which will be described later, and also when returning to the original copy mode after the copy is completed.

Also, when changing the magnification, the drum is rotated one more time (83). This is for break-in operation when switching from high speed to low speed, and for potential stabilization and cleaning.

Management Q102 sets the position of the lens during the previous rotation. Only when the lens is moved, the potential is measured and a predetermined developing bias is set (171). Next, sequence Q101 to management Q102
requests variable magnification mode data, and if it determines that the data is an enlarged copy, sets in RAM data that will be inverted at the middle position among the three positions as mirror system scan inversion position data (172,
173). In other words, no matter what the cassette size is, medium
The B4 size position is the stroke length.

In the first reduction mode (1:0.79), (173),
The size data of the selected cassette is requested from the management Q102. And the cassette size is B5
It is determined whether this is the case (174), and if so, the short half-size position (A4) is set as reverse position data (175). Otherwise A4R sequentially.
It is determined whether they are A4, B5R, or n2, and if they are all different, the longest full size position (A3) is set as inverted data (176). In either case, the original middle position is set. Note that u2 is a small cassette that can store various small-sized sheets such as postcards.

When in the second reduction mode (1:67) (177), A4,
If it is not B5, u2, or B5R, the full size is used as inverted data, and in any case, it is used as the middle position.

At the same size, only A3 is full size, A4, A5,
Half size for any u2, medium size for others.

In this way, an appropriate reversal position can be determined depending on the magnification mode and the cassette at that time. This can prevent unnecessary scanning operations.

Next, in Figure 7-3, the counter for the number of sheets remaining in the machine, the total counter, and the key counter are incremented by 1 (271), it is determined whether the manual feed switch is on, and the operation control of the upper cassette roller is performed. Do (272). The stage data of the selected cassette from the management Q102 is determined and one of the rollers 11 and 12 is turned on (273). Total, key counter +
1 turn off the solenoid. After a delay due to the count of the drum clock, a developing bias voltage is applied to the developing device, the plank lamp is turned off, and the document exposure lamp is turned on (274). The home position of the scanning optical system is confirmed (275), and a forward start signal for it is output (276).

At this time, one of the four advance clutches provided according to the variable magnification mode is selected, and the mirror and lamp are advanced at a scanning speed determined by the peripheral speed of the drum and the variable magnification ratio. 271mm/sec for actual magnification, 240mm/sec for 1:0.79 reduction, 284mm/sec for 1:0.67
seconds, 148mm/second when expanded. Outputs a signal to turn on the registration roller 15 during advancement (7-4
371) in the figure, it is determined whether or not the previously set inversion position has been reached by comparing it with the switch signal 815 in FIG. 3-1 (372). Then, turn on the blank lamp, turn off the forward motion of the mirror system, and turn on the forward clutch (373). Then, the lamp is turned off or the exposure lamp is turned off with a delay only during reduction copying. The optical system reaches the home position and stops (470).

Then, each process is turned off and the aforementioned post-rotation routine is entered (570). Next, it is confirmed that the transfer paper is discharged from the switch 18, and the drum is stopped (571). Thereafter, the above-mentioned routine processing is performed depending on whether the input timing of command data for restarting copying is within 60 seconds or other than that. If left unattended for more than 2 hours, the power of the microcomputer remains and everything else turns off.

Fig. 7-6 is inserted into the closed loop of Figs. 7-1 to 7-5, and the computer Q10
1 and Q102, control to detect sheet discharge from the sensor 18 and decrement the in-machine counter by 1, control to input and judge a thermistor disconnection signal and send abnormal data to the management Q102 (I/O),
Further, a timer is used to determine troubles in the forward and reverse clutches, and a timer is used to determine troubles in the drum clock pulse generator, and data transmission is similarly controlled. If a problem occurs, the process returns to the power switch determination routine shown in Figure 7-1 and waits.

The management Q102 receives this data and displays identification such as E1, E2, etc. on the numerical display 68.

(Drum Speed Switching) The main motor M1 is a motor that mainly drives the rotation of the photosensitive drum, fixing roller, etc. In this embodiment, the rotation direction of the motor is controlled so that the rotation speed of the drum is controlled in two stages. In the power transmission block diagram shown in Figure 5-1, one-way clutches CL1 and CL2 are provided on the output shaft of motor M1, and CL
2 is provided with a reduction gear. When the motor rotates clockwise (normal rotation), the power is directly outputted as clockwise rotational power via the one-way clutch CL1, that is, as shaft rotation along the normal rotation power transmission route LT1. Next, when the output shaft of motor M1 is rotated counterclockwise (reversely), at this time CL1
does not transmit power, and conversely, CL2 transmits power while the power is reversed, and is decelerated to a predetermined rotation speed by gear G1, and the output from G1 is again clockwise rotation, that is, the power at the time of reverse rotation. Along the transmission route LT2, the rotation is decelerated and output on the same axis as the above-mentioned axis.

In this way, in this embodiment, the rotational speed is changed by switching the rotation of the motor M1 between forward and reverse directions. Thereby, the rotational speed (copying process speed) of the photosensitive drum can be changed at low cost and by simple control, and stable rotation can be obtained.

FIG. 5-2 shows another embodiment of speed switching. The motor 1-1 is a motor that has two outputs in the same rotational direction but different only in rotational speed, and the transmission of each motor is switched using electromagnetic clutches CL3 and CL4.There are several ways to simply switch the rotational speed, but these are If the method described above is limited to two-speed switching, it is the cheapest and has the highest reliability.

In FIG. 3-3, in order to control speed switching mainly aimed at copying process speed, the common terminal J11-1 of the main motor M1 is connected to one power source, and the main coil terminal J11-2 and the auxiliary coil terminal J11- 3, and connect the terminals J11-2 and J11-3 to the other power supply via solid state relays Q304 and Q305, and turn on Q304 to turn on the M
1 is rotated in the forward direction, and Q305 is turned on to control M1 to be rotated in the reverse direction.

According to the switching timing of this drum speed, high voltage transformers for primary and secondary charging, transfer,
If the pre-static elimination transformer is on, its output is switched at a ratio of 1:0.7. The drum speed also has a 1:0.7 relationship. Experiments have shown that an output ratio approximately corresponding to the drum speed ratio is sufficient. Since the output of the processing means is weakened at low speeds, processing can be performed with an appropriate potential and a stable image can be obtained regardless of the variable magnification mode. The amount of light from the exposure lamp 23 is also changed in accordance with the movement of the lens due to the variable magnification set so as to always provide the same amount of image irradiation. In other words, it indirectly depends on the circumferential speed of the drum.

Incidentally, the voltage applied to the lamp can also be controlled in accordance with the drum circumferential speed switching control.

(Continuous copying at different magnifications) In this example, the drum rotates at a low speed until the variable magnification (reduction, enlargement) copying is completed and the drum stops. Thereafter, during rotation, the same size key is input, and the management Q102 receives it and displays it, and even if the copy key is used to start, the drum does not speed up. After that, the main motor's reverse rotation output is turned off only after rotation is complete, and the output is switched to forward rotation after 30 milliseconds. Therefore, unevenness due to speed switching does not occur in equalizing the drum potential during post-rotation.

Further, the rotational speed switching system of this example can correct rotational changes due to differences in power supply frequency by detecting the change or automatically or manually switching the motor between forward and reverse directions depending on the frequency.

(Key input/display control) The operation of the management controller Q102 will be explained with reference to FIGS. 6-1 to 6-4. In Figure 6-1, when the computer power is applied, the I/O ports and RAM are cleared to the initial state (step 60).
After mutually confirming that the reset of the sequence controller Q101 has been completed (61), the operation starts. Then, an oscillator signal (1.2KHz) is applied to the interrupt terminal (iNT) to enable program interrupt processing (62), and this signal generates an interrupt.
- Execute the routine in Figure 2 to scan the input of each KEY and dynamically display each display (162),
It monitors data serial transfer requests exchanged with Q101.

Incidentally, since the probe signal for this dynamic display is used to detect an abnormality in the management controller Q102, it is scanned and outputted regardless of whether the main switch is turned on or not, in preparation for display. However, when the main switch is not turned on, the display power is turned off by the sequence controller Q101, so it does not actually light up.

By the way, when the main SW input signal is transmitted from the sequence controller Q101 by serial transfer, the management controller Q102
Allow key input, clear the 2-hour timer, and restart it (63-65).

During wait, sequence controller Q10
1, the lens position must be at the same magnification position in order to control the current of the charger and the document exposure lamp by potential control. Therefore, the management controller Q102 is the sequence controller Q1
Since a signal requesting the "lens equal magnification position" is sent from 01, the lens is made equal to the same magnification by the lens movement subroutine shown in FIG. 6-4 (67).

When the wait end signal is transmitted from the sequence controller by serial transfer, the 60 second timer is cleared and restarted (68).

By the way, the 2-hour timer and the 60-second timer are timers that are extended each time the operator operates the copying machine, such as by pressing a key. The 2-hour timer turns off the power switch to save energy when the operator forgets to turn off the copier when the copier is not operated for more than 2 hours.
Make it. Further, the 60 second timer is used to initialize the display when the operator does not operate the copying machine for 60 seconds or more. This 60 second timer selects the standard mode, that is, the same size selection and the lower cassette, and sets the set number of copies (display 68) to "1" (69). However, if there is not enough developer or if there is no paper or cassette, the 60 second timer will not work. This is done in consideration of the fact that the operator is recovering from a copy interruption state. Also, the 60 second timer does not operate during the wait.

The MCOM-Q101 and Q102 shown in FIG. 3-1 will be explained in detail.

(Serial Transfer) Data exchange between microcomputers in this example is performed by data serial transfer. In this example, data is not transferred to either one of the two MCOMs, but simultaneously in both directions. The process will be explained in detail below using the flowcharts shown in FIGS. 6-2 and 7-6.

First, the sequence controller MCOM-1
01 port Q ₁₁ of the management controller
Send serial transfer request signal (RQ) to input port i ₁₁ of MCOMQ102 (steps in Figure 7-6)
600). This is done by setting the serial request line 112 from Q101 to the "L" level. When Q102 senses "L" on this line 112 (step 164 in Figure 6-2), Q102
It prepares serial data from to Q101 (165), and sends a signal (ENABLE) indicating that serial transfer is possible via line 111 to Q101 (166). When Q101 receives this enable signal (602), it prepares for serial transfer data from Q101 (603), and then Q101 and Q102 simultaneously transfer data to each other through lines 114 and 115, respectively, in the form of data exchange. (Step 167 in Figure 6-2, Step 604 in Figure 7-6). In this step, it is determined whether the shift register has received 16 bits of data, the data is stored in the RAM, and the contents are determined. Note that the transfer is performed by shifting and storing data in each shift register in sequence using a shift clock pulse on line 113. As shown in FIG. 8, this data is set depending on which of the 16 bits is 1 or 0. Pipe → shi means Q102 to Q101, shi → pipe means Q
This is the data content sent from Q101 to Q102. For example, the data received by Q101 at address 1 of ST3 indicates that a trouble has occurred in the lens movement when the time variable magnification is set to 1. Sequence Q101 thereby prohibits the copy operation. When address 2 of ST1 is 1, it indicates input of an enlarged copy set. Q101 thereby causes the main motor to perform enlargement control such as changing the speed of the optical system. Also, Q102 received ST0
When address 2 is 1, it indicates that a trouble has occurred in the movement of the optical system, etc. The management Q 102 thereby controls the copy display 800 to display an error (such as EO) using the LED segment and to prohibit key input.
Also, when addresses 1 and 0 of SO0 are 1, it indicates that the back door switch or the main switch is open, and Q102 accordingly switches the wait display or stops controlling the number display. Similarly, data written in the drawings corresponds to each bit.

The same holds true when a transfer request is issued from the port of the management Q 102 to the sequence.

Q101 is configured to perform periodic serial transfer at approximately 370 msec. This is done by the transfer timer t (an internal timer as described above) (600, 606).

Also, monitoring of the serial request from Q102 in Q101 is performed by port sensing, and is performed by a subroutine provided in the closed loop routine in the main flow of the sequence. This subroutine also constantly monitors the on/off state of the main switch (step 599 in Figure 7-6).

Also, the monitoring of the serial request from Q101 in Q102 is performed in addition to the key input control and dynamic control routines for displaying the number of copies and the like. Therefore, it is monitored almost all the time.

By the way, the management controller Q102 has a timer t' that is initialized every time serial transfer is performed, and the sequence controller Q102 has a timer t' that is initialized every time a serial transfer is performed.
It is possible to recognize a case where serial transfer is stopped due to runaway of 101 or the like. That is, the steps in Figure 6-2
The internal timer is started by 169, and if the next transfer is not made within the timer time (170), the sequence controller recognizes that there is an abnormality and enters a closed loop program (172), and starts the key scan.
The segment scan probe signal is stopped. This activates the abnormality detection circuit 900 connected to Q102.

₍ Sequence Timing) In Figure _7-1 , the fixing heater,
After operating the main motor in sequence, then measuring the surface potential and controlling it optimally, wait for the wait to rise (78), determine the copy start input from _Q102 (79), and proceed as shown in Figure 7-2. Performs a memory set for the optical system inversion position. This is set by the desired magnification input (59 in FIG. 2) and the cassette size input (172-177), as described above. In addition to specifying the cassette using the key 59 in FIG. 2 as input for changing the magnification, it is also possible to input only the changing magnification using the keys.

After this, the sequence computer Q ₁₀₁ is the 7th-3rd
Start paper feed control as shown in the figure. A timer (internal timer) to check for abnormal operation of the optical system before
Clear and start.

In Figure 7-3, add 1 to the counter for the number of sheets of paper remaining in the machine for correcting the jam etc. counter, and then add 1 to the total counter and key counter 3.
7, 38 are turned on (271), and if it is not the hand-feeding mode, the pick-up roller 11 or 12 of the upper or lower selected cassette is turned on (273). This causes the total counter to operate simultaneously with paper feeding. By the way, since the paper feeding paths are different for the upper and lower stages, the paper is fed by two rotations of the roller for upper stage paper feeding and one revolution for lower stage paper feeding. Steps 273-2 and 273-3 relate to clutch control for upper paper feeding only.

The pick-up roller is constructed so that when the clutch is turned on, it mechanically rotates half a turn and stops, and when the clutch is turned off, it mechanically rotates one more time and stops at the original position.

Therefore, in the case of upper paper feeding, the clutch is turned on and turned off before the roller has made half a revolution. Then, by turning on the clutch again after half a revolution or more and less than one revolution (273-8), it is stopped and held at one and a half revolutions. However, in the case of lower paper feeding, by turning on the clutch once, 12 is stopped and held in a half-rotated state.

By the way, after paper feeding starts, the total counter and key counter 3 are counted at the off timing of the upper clutch.
7, 38 is turned off to complete the operation (273-4).

Then, the forward clutch 22 is turned on (276). However, since the halogen lamp for exposing the original does not rise to a sufficient amount of light until the optical system enters the image area, it is turned on in advance before the forward clutch 22 is turned on (274). At the same time, the blank exposure lamp 10 for black erasure is turned off according to the paper size. Then, the developing sleeve 7 for development is rotated, and a developing bias appropriate for developing is applied to the developing sleeve (274-0). Then, the forward clutch corresponding to the magnification change is turned on, and the optical system begins to move forward at a speed corresponding to the magnification change. Since it is the first card, it starts forward with a delay of 53 clocks (276-0).

9 is a schematic sectional view of the optical system scanning section and lens section of FIG. 1, and FIG. 10 is a perspective view of the scanning section. With reference to these, novel scanning system control, registration control, blanking control, pick-up control, etc. in this example will be explained.

(Regist) In FIG. 10, reference numerals 306 and 307 are a registration control flag member (hereinafter referred to as a comb flag) and a scanning system control flag member that move in synchronization with the movement of the first mirror 24. It is fixed to the rail fixture as shown in the figure. 306 is provided with five light shielding parts 1 to 5 in a comb shape, and 307 is provided with two light shielding parts. Further, 304 is a photo interrupter which blocks light and generates a signal when the comb portions 1 to 5 of the flag 306 pass therethrough, and 302, 303, and 305 are photointerrupters which generate a signal when the light blocking portions 1 and 2 of the flag 307 pass therethrough. This is a photo interrupter that generates a signal when light is blocked. 302, 303 are electrically shot
The input is connected to the input port i ₈ (Figure 3-1) of Q ₁₀₁ in an OR relationship. 305 is input connected to i ₆ and 304 is input connected to i ₇ .

Photo interrupter (hereinafter referred to as sensor) 30
2, 303 is mainly for stopping forward movement and starting backward movement. 305 stops the optical system,
A sensor 304 is used to control the registration timing.

First, the optical system starts moving forward according to the procedure described above, and when the first digit of the flag 306 passes the sensor 304, the optical system is at the exposure start position of the original image (276-1). At this time, stop the registration roller 15 and prepare to align the leading edge of the paper (276-
2). Then, after the sensor detects the drum pulse for 18 clocks, and after the time counted by the microcomputer has elapsed, the clutch for the pick-up roller that was previously turned on is activated so that the paper that hits the stopped registration roller draws a loop of the appropriate length. Turn off, rotate the roller the remaining half turn, and stop (276-3). Thereafter, the paper hits the registration rollers 15 and stops.

In the case of the same magnification, the sensor 304 is connected to the flag 306.
When the third one is detected (370-3), the registration roller 11 starts rotating (371). Also, in the case of reduction -1, the fourth position is detected (370-1), in the case of reduction -2, the fifth position (370-2) is detected, and in the case of expansion, the second position is detected (370-1). ), the registration roller 15 begins to rotate. The paper conveyance speed and the scanning speed of the optical system differ depending on the magnification change, but the timing position of the rotation start of the registration roller 15 is adjusted so that the leading edge of the paper and the leading edge of the image on the drum match. It has been changed.

By the way, the procedure for confirming flag positions 2 to 5 is performed by counting pulses generated from the sensor 304 while the vehicle is moving forward. It determines the position by counting from the tip signal of the original flag 306. By providing a program for this count in the memory ROM as an interrupt program to be executed with priority, and connecting the output of the sensor 304 to the interrupt port of the MCOM-Q ₁₀₁ , a large number of step-by-step programs for counting can be assembled. I don't need it.

(Reversal) Next, when the forward exposure of the optical system is completed, the flag 307
1 and 2 reach sensors 302 and 303. By the way, the optical system is controlled to move forward and backward at three different reversal positions depending on the size of A4, B4, and A3 size paper. On the other hand, the outputs of sensors 303 and 302 are wired OR, and the flag 307 is
2 or 303, a pulse is output.

The distance between the first and second flags 307 is (A3 size - B4 size) = 44 mm, and the sensor 303 is at the A4 size inversion position on the optical system movement path, and the sensor 302 is at the B4 size inversion position. provided at the location.

And the A4 size inversion position is sensor 303
When the second flag of flag 307 passes, B4
The size is reversed when the first of the flags 307 passes through the sensor 302, and the A3 size is reversed when the second of the flags 307 passes through the sensor 302. In other words, the second signal of the wired-OR signal by the reversal sensors 302 and 303 controls the reversal of A4 size, the third signal can be detected as the reversal position of B4 size, and the fourth signal can be detected as the reversal position of A3 size. . The above is shown in step 372.

These second, third, and fourth determinations are made by the sensor 302,
This is done by counting the pulses of the OR signal from 303 as 2, 3, and 4 according to the input signals from the cassettes A4, B4, and A3 (however, the cassette on the designated side).

I will explain why I installed two reversal sensors and wired or. If the number of reversal sensors is 1 and the small flags 307 are provided at three locations, the reversal positions can be determined at three locations. However, the distance between the small flags reaches a maximum of (A3-A4) = 210mm, and in the case of an A3 size scan, the range of movement and influence of the largest flag is (A3 + 210) = 430mm. The protrusion of the flag member in the scanning direction of the machine becomes large.

In this example, two sensors and two small flags are used to detect three positions, so the protrusion of the flag member is only 44 mm, contributing to miniaturization of the copying machine. Also, a large number of inversion controls can be performed with a small number of sensors. Furthermore, by increasing the number of sensors and small flags, even more reversal control can be performed.
It is also possible to check whether the optical system has overrun beyond the specified limits. The above and the following can be applied not only to the moving optical system scanning type but also to the type in which the optical system is fixed and the document table moves back and forth.

(Blank lamp, exposure lamp) As described above, reversal control is performed regardless of magnification, but since the speeds are different, in the case of half-size copying due to reduction, the time required to complete copying can be shortened. You can substantially increase the speed of repeated copies.

After detecting the reversal position and before controlling it, the time operation of the optical system abnormality timer t mentioned above is canceled (372-1). Also, turn on the blank lamp in advance (372-2). This was done in consideration of the rise of the blank lamp, and at the same magnification, after turning on the blank lamp and counting three drum pulses, the forward clutch 22a is turned off and the reversing clutch 22b for reverse movement is turned on (373).

During reduction, after the desired reversal sensor is detected, the forward clutch 22a is turned off and the reverse clutch 22a is turned on (372-3) after 8 clocks are detected, and then the original lamp 23 is counted for 5 more clocks for a total of 13 clocks. Turn off (373-1). In other words, the exposure lamp 23 is turned on slightly even at the beginning of reverse movement.

This prevents parts outside the original image from appearing on the transfer paper during reduction, and overlaps blank exposure and original exposure to prevent black areas from appearing on the transfer paper. If blackening is performed using only blank lamps, the blank lamps are often used in rows of small lamps, and in this case, the arrangement of the lamps will be uneven. Therefore, to prevent this, the exposure lamp is also kept on. It is also possible to reduce the light intensity of the exposure lamp to about 2/3 at the time of reversal or at the end of exposure before that, and to continue to turn it off until the above-mentioned lamp off timing, thereby reducing lamp burnout due to reversal shock.

(Repeat paper feeding, home stop) By the way, when the second flag of the flag 307 passes the sensor 303 during reversal, preparations are made for feeding the next copy (373-3). The flowchart states that this is executed 13 clocks after the inversion, but it is executed at the same time as the inversion starts. In order to determine the paper feeding timing by the combination of the flag 307 and the sensor 303, regardless of the size, pulses of the OR signal are counted as described above as shown in the flowchart. In this way, even if the size is different, the loop amount is kept constant so that it can wait in front of the registration roller. Then, the copy start data (ST2-2 in FIG. 8) in the serial transfer from the management controller Q ₁₀₂ is checked to see if copying is to be continued (374). This data is output and set by the copy counter function of the management controller, and when the copy counter counts up to the preset number, it becomes 0, indicating that copying will not continue. This counter checks the serial data (1 in ST2) from the sequence controller Q ₁₀₁ to the management controller Q ₁₀₂ and increments it by 1, and this data is set to 1 when the aforementioned inversion is detected.

After counting up, the process shown in Figure 7-5 is executed, and when the optical system reaches the home position, the sensor 305 detects flag 3.
07-2 is sensed, the reverse clutch 22b is turned off, and the optical system is stopped (470). However, this is a reduction,
In the case of magnification (468), when the magnification is the same, the first flag of the flags 306 detects the sensor 304, and the reversing clutch 2b is turned off in advance, after which the optical system is run by inertia to the home position. This detection is performed by counting five pulses from the sensor 304 during reversal (469).

This is because the process speed is changed when magnifying the image at the same magnification and when changing the magnification, so the speed of the optical system when reversing the image changes. Therefore, when changing the magnification, even if the reversing clutch 22b is disengaged after detecting the home position, there is little impact.However, when the magnification is the same, the reversing speed is fast, so if the reversing clutch 22b is disengaged after detecting the home position, it will not be possible to disengage the reversing clutch 22b after detecting the home position. The impulse that hits the stop increases. This can be prevented.

By the way, after confirming the copy repeat in step 374 in Figure 7-4, the steps in Figure 7-2 and 7-
Returning to FIG. 3, the same control as the pickup operation from the first sheet as described above is performed. However, No. 7-3
As shown from step 274-4 in the figure, a different routine is performed for the second and subsequent copies. 274-4～275-
The routine up to step 1 is the same as the optical system reverse clutch off routine shown in FIG. 7-5, and off control is performed in accordance with the same magnification or variable magnification.

After detecting the home position (275), forward clutch 2 is activated again.
2a is turned on (276), and the registration roller and pick-up roller are turned off as described above.

By the way, since one cycle of the optical system is about 4 seconds, timer A, which is cleared and started at the time of paper feeding, does not elapse for more than 4 seconds. If the timer has elapsed for more than 5 seconds, it means that some kind of abnormality has occurred in the optical system, and the copying operation must be stopped immediately (fusing heater, corona high pressure, main motor, etc. are turned off except for the display), and there is an optical system abnormality. Display.
This is accomplished by step 598 of Figure 7-6.

In this case, this stop and display routine will be repeated unless the main switch is turned off.

However, when the optical system is reversed at the same magnification, if approximately 1 second (more than 4 seconds after paper feeding) has elapsed after the reversing clutch is turned off, the inertia may be increased due to worsening of the rail on which the mirror runs. It is assumed that the force has decreased, and in this case, the reverse clutch 22b
Turn it on again and reach home (275-3).
However, if the home position is not reached even after the abnormality detection timer A operates for a total of 5 seconds or more, copying is stopped and an abnormality is displayed as described above. Incidentally, the abnormality timer A is cleared by detecting the home position.

When changing the magnification, abnormality determination is simply executed in the subroutine shown in FIG. 7-6 as described above.

In this way, a safe and highly accurate copying machine can be provided.

After the repeat copy is completed and the optical system stops at the home position shown in Figure 7-5 as described above, the drum pulse is counted for 64 clocks and the developing bias and each high voltage transformer are turned off (step 570), and then
Count 90 clocks to weaken the high-pressure secondary corona, then count 169 to turn it off.
Then, it is checked whether the trailing edge of the paper has been discharged from the exit sensor (570-1), the main motor and blank lamp are turned off, and a standby timer is started. At this time, serial data is sent to the management Q ₁₀₂ to start the 2-hour timer. If you do not turn on the copy key after that, the sequence Q ₁₀₁ will turn on the main switch 50 according to the 2-hour up data from the management.
1 is forcibly turned off by a plunger. Sequence Q ₁₀₁ determines whether the main switch is off, turns off the outputs of regulators VR ₁ and VR ₂ , and turns off all loads including the display.

If you turn on the copy key before 2 hours have elapsed, it will be determined whether it is within 60 seconds after the main motor was turned off and the 7th
-1 Enter routine B or C in Figure 1 and resume copying.

Incidentally, data such as abnormalities in the optical system are sent to the management controller by serial transfer, and the management can judge the data and cause the number display 68 to display different errors.

[Effect] As explained above, according to the present invention, a comb member having a plurality of comb parts at positions corresponding to each copying magnification 1:1 is moved together with a reciprocating member, and the comb member is moved by the plurality of comb parts. Registration control is performed by counting the generated pulse signals corresponding to each copying magnification, so registration control corresponding to each copying magnification can be performed accurately without using counters that count high-frequency clocks or high-precision timers. It can be carried out. This can prove to be an extremely dangerous problem.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a copying apparatus to which the present invention can be applied, FIG. 2 is a plan view of the copying apparatus shown in FIG.
Figures 1, 3-2, and 3-3 are control circuit diagrams of the copying machine in Figure 1, Figures 4-1 and 4-2 are input/output operation time charts, and Figures 5-1 and 5. Figure-2 is the main motor drive block diagram, Figures 6-1 to 6-4.
The figure is a control flowchart by the management computer, Figures 7-1 to 7-6 are control flowcharts by the sequence computer, Figure 8 is a diagram showing serial transfer data, Figure 9 is a schematic diagram of the vicinity of the scanning unit, FIG. 10 is a perspective view of the scanning section. 3 in the diagram
0-1 is a lens at the same-magnification copying position, 1 is a photosensitive drum, 23 is an exposure lamp that scans, and 2
4 and 25 are mirror systems that scan, 13 is an upper paper feed cassette, 14 is a lower paper feed cassette, and 46
is a sorter.

Claims (1)

[Scope of Claims] 1. A reciprocating member that reciprocates to expose and scan an original, and after forming an electrostatic latent image on a photoreceptor according to the original image exposed and scanned by the reciprocating member, the electrostatic latent image is various process means for forming a toner image on the photoconductor by developing a latent image and transferring the toner image to a conveyed transfer material; a comb member having a plurality of comb parts each provided at a position corresponding to 1; and the comb member moves and generates a pulse signal when each of the plurality of comb parts reaches a predetermined position. a pulse signal generating means; a conveying means for conveying the transfer material to the transfer position; an input means for selecting a copying magnification; and performing a desired variable-magnification copying operation in accordance with the copying magnification input from the input means. control means for controlling the speed of the reciprocating member so as to control the speed of the reciprocating member, and controlling the conveying means based on the input copying magnification and each of the pulse signals, the control means controlling the copying magnification input from the input means scanning speed changing means for changing the scanning speed of the reciprocating member based on the scanning speed of the reciprocating member; counting means for counting pulse signals corresponding to each copying magnification generated by the pulse signal generating means; and conveyance timing control means for detecting that the counting means has counted a number of pulses corresponding to the copying magnification input by the input means during operation, and causing the conveyance means to start conveying the transfer material. A copying device that uses