JPS61239261A - Copying device - Google Patents

Abstract

PURPOSE:To add the information of a scale pattern which does not exist on an original to a copy image with an optional size by constituting an eraser with an erasing light source and a liquid crystal shutter. CONSTITUTION:An electrostatic charger 23, an eraser 24, a developing unit 10, a transfer charger 19, a separating charger 20, a cleaning unit 22, etc. are arranged around a photosensitive drum 9. The eraser 24 consists of the erasing light source and the liquid crystal shutter and light transmission control electrodes, namely, segment electrodes are arranged in the transverse direction of the photosensitive drum 9 to constitute the liquid crystal shutter. Prescribed scale pattern information having a size corresponding to the indication from a scale size indicating means is generated and a light transmission control voltage is applied to individual segment electrodes selectively to control erasing in the transverse direction of the photosensitive drum 9 and printing of characters including the scale pattern.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a copying apparatus that projects light corresponding to the light/image of an original onto a photoreceptor to form an electrostatic latent image and develops the image, and particularly relates to a copying apparatus that forms an electrostatic latent image and develops it. Although not intended to be limiting, it is possible to perform erasing processing for image editing, such as exposing the photoreceptor area outside the original area and erasing the development of the extra area, or recording only a part of the 1M manuscript image and erasing the rest. This invention relates to improvements in erase devices.

2. Prior Art In a typical electrophotographic copying apparatus, an eraser can be used to partially extract or erase an electrostatic latent image formed on a photoreceptor. Further, in a digital electrophotographic copying apparatus, a part of an image can be extracted or erased by processing image information converted into a digital signal. An erase device is provided to perform such document area extraction or editing processing. In the simplest conventional mode, a plurality of shutters, which are associated in advance with the document image area (size) on the photoconductor determined by the recording paper size and/or document size that can be set for copying and the copying magnification, are placed between the erase light source and the photoconductor. one or more shutters are selectively inserted between the erase light source and the photoreceptor based on the set recording paper size and/or original size and copying magnification, and the shutter section is set as non-exposed. The exposure section is exposed to original image light. In this case, the recording paper size, document size, and copying magnification are limited. In addition, an editing copy that creates an image of another original by making a copy by erasing an arbitrary area on the original and copying it again to the erased area (this time extracting the area corresponding to the erased area and erasing the other parts) Have difficulty. Therefore, recently, a light emitting diode array has been used as an erase light source (for example,
-008710). When using a light emitting diode array, it is possible to extract (or erase) and copy images of a desired area using, for example, a 3 mm square rectangular area as the minimum unit.

However, even the smallest unit that can be set with a light emitting diode array, such as 3 mm square, may be too large for erasing outside the original image or setting the area for image extraction (erase) editing when copying at an arbitrary magnification. When actively using an eraser to print characters such as letters, there is a problem that the minimum unit is too large. Another problem is that the light emitting diode array has many and complicated wiring connections.

By the way, in the case of a drawing with accurate dimensions, it is convenient to have a scale or graduation on the drawing because it allows the actual dimensions of the objects on the drawing to be determined.

Therefore, companies generally standardize the paper used to write drawings and write the scale on the paper in advance. However, it is difficult for small offices and individuals to create such special forms of paper. Furthermore, since it is difficult to erase what has been printed in advance (the scale in this case), it may be desirable not to include the scale in the original drawing in order to make corrections easier.

(1) Purpose of the Invention The object of the present invention is to add scale pattern information that does not exist on the original to a copy image in an arbitrary size.

■Structure of the Invention In order to achieve the above object, the present invention provides a selective exposure means that prohibits exposure of a part of the document exposure means, and a photoreceptor that exposes the surface of the photoreceptor after charging and before development. A liquid crystal shutter having light transmission control electrodes arranged in a divided manner in the width direction is inserted between an erase light source arranged in the width direction of the photoreceptor and the photoconductor, and a liquid crystal energizing means is applied to each of the light transmission control electrodes. A light transmission setting voltage and a light non-transmission setting voltage are selectively applied according to the information of the scale pattern.

The scale pattern information is set to a size corresponding to a numerical value input designation from a numeric keypad, for example.

According to this method, 1. The scale is automatically recorded on the copy paper at the same time as normal copying processing or after normal copying, so there is no need to print the scale on the original or copy paper in advance. . Since this recording is performed using a liquid crystal unit, high-density recording is possible. Therefore,
Accurate scale of dimensions can be recorded.

Other objects and features of the invention will become apparent from the following description with reference to the drawings.

FIG. 1 shows an external appearance of an embodiment of the present invention, FIG. 2a shows an outline of the internal mechanism, and FIG. 2b shows an enlarged view of elements around the photosensitive drum. First, referring to Figure 1, 1
2 is a contact glass on which the original is placed, a pressure plate 2 presses the original from above, and 42 is an operation board. At the end of the contact glass 1, the coordinate origin and X,
In order to show an outline of the Y-axis direction, an X scale (minimum unit of 1 mm) 41X along the document scanning direction X and an X scale (minimum unit of 1 mm) 41y along the Y-axis direction are arranged. The X scale 41x and the X scale 414 are both marked with numerical values that increase in each axial direction with one corner 40 of the contact glass 1 as a reference point (zero point).

Referring to FIGS. 2a and 2b, below the contact glass 1 there is an illumination lamp 3. 1st mirror 4. 2nd mirror 5. An optical scanning system consisting of a third mirror 6, a lens 7, a fourth mirror 8, etc. is provided. This optical scanning system is driven for reciprocating scanning in the direction of arrow X and in the opposite direction. Note that the illumination lamp 3. The first carriage (99) on which the first mirror 4 etc. is mounted is connected to the second carriage (99).
Mirror 5. It moves at twice the speed of the second carriage on which the third mirror 6, etc. is mounted.

The reflected light from the original is reflected by the second mirror 5. The light is guided to the surface of the photosensitive drum 9 through an optical system composed of a third mirror 6, a lens unit 7, and a fourth mirror 8. An image exposure shutter 200 is arranged between the fourth mirror 8 and the photosensitive drum 9. This shutter 200 is used to copy an eraser (eraser) 2 in character print mode, which will be described later.
This is provided to prevent exposure of the erase exposure area in the character print mode according to No. 4 with one image light.

Around the photosensitive drum 9, a charging charger 23, an eraser 24 . Developer unit 10. Transfer charger 1
92 separation charger 20. Cleaning unit 22
Equipped with etc. The photosensitive drum 9 rotates clockwise in this example.

The surface of the photosensitive drum 9 is first charged to a uniform high potential by the charging charger 23. When the high potential surface is irradiated with light from the document, the potential of that surface changes depending on the intensity of the irradiated light, and this causes the surface of the photoreceptor drum 9 to have a potential distribution according to the image, that is, an electrostatic potential. An image is formed. Portions where the irradiation light is strong, that is, portions corresponding to the white color of the image, have a low potential, and portions where the light is weak, that is, the portions that correspond to the black color of the image, have a high potential.

As will be described later, the eraser 24 is comprised of a rod-shaped cathode ray tube and a liquid crystal shutter in this example, and is configured to selectively irradiate light onto the non-image area or the image area to be erased on the surface of the corresponding photoreceptor drum 9. , lower the potential of that part to a white level potential.

Therefore, even if the area of the photoreceptor drum 9 that has been erased by the eraser 24 is irradiated with light obtained from the black image of the original, the potential of that area will be at the white level, and the black image will not be reproduced in that area. Not done. In addition to this, in the character print mode, the eraser 24 performs character print processing in which the character part is set to a black level and a limited area around it is set to a white level in order to add a character to a specified area on the document. Let's do it.

The electrostatic latent image on the photosensitive drum 9 is developed by a developing unit 10. In other words, when passing through the developing unit 100, the black toner particles in the developing unit 10 are attracted to the high-potential parts, and not to the low-potential parts, so that the black and white particles are adjusted according to the potential distribution of the electrostatic latent image. An image is reproduced on the photoreceptor drum 9.

In this example, recording sheets are stored in two paper feed cassettes 11 and 12, and the paper is fed from one of the selected paper cassettes. 13 and 15 are paper feed rollers, 14.16 and 1
8 is a feed roller, and 17 is a registration roller. The leading edge of the fed recording sheet touches the registration roller 17.
The photoreceptor drum 9 is stopped once in contact with the photoreceptor drum 9, and at a predetermined timing synchronized with the rotation of the photoreceptor drum 9 and scanning of the original image, the registration roller 17 causes the image to overlap with the visible image (toner image) on the surface of the photoreceptor drum 9. sent to.

When the recording sheet passes the position of the transfer charger 1'9, the visible image on the photosensitive drum 9 is transferred to the recording sheet. When the recording sheet passes through the position of the separation charger 20, the recording sheet is separated from the photosensitive drum 9 and guided to the conveyance path. When the toner image on the recording sheet passes through a fixing unit 21 disposed on the conveyance path downstream of the photosensitive drum 9, the toner image on the recording sheet is fixed to the recording sheet by the heat.

The conveyance path on the downstream side of the fixing unit 21 branches into three. The upper conveyance path is used for inverting the recording sheet, and the lower conveyance path is used as a return path for performing multiple copy processes. The central conveyance path is the paper ejection path. Which conveyance route is used is determined by the state of the conveyance direction control mechanism 31 provided at the branch point. When the return path is selected, the recording sheet is transported to the intermediate tray 34 by the transport rollers 32 and the transport belt 33, and at a predetermined paper feeding timing, the recording sheet is transported to the intermediate tray 34 by the paper feeding rollers 35. The paper is fed to the registration roller 17 via feed rollers 36 and 18. The reversing path is used for single-sided copying and for aligning the sides of recording sheets to be ejected.

FIG. 2C shows the first carriage 99 section on which the illumination lamp 3 is mounted in some detail. Two scale support arms SA are fixed to the first carriage 99. These arms SA are located outside the end of the illumination lamp 3. When the carriage 99 is in the standby position (home position: HP), a translucent Y-axis scale 100 is disposed above the arm SA. This scale 100 is pressed against the top plate of the copying machine by two support arms 101, front and rear. Support arm 101 is pivotally attached to shaft 102 . A pin is fixed to the lower end of the support arm 101, and this pin is pulled to the right by a tension coil spring 104. This spring force applies a counterclockwise rotational force to the arm 101, and the arm 101 moves the scale 100 upward. is being lifted up.

The solenoid 1 is attached to the pin engaged with the spring 104.
03 plunger is engaged. Solenoid 103, when energized, pulls the plunger to the left, thereby
Rotate the arm 101 clockwise against the spring 104.

When the solenoid 103 is energized while the first carriage 99 is in the home position (the state shown in FIG. 2C), the arm 101 rotates clockwise.
0 descends and gets on arm SA. When the carriage 99 is driven in the scanning direction X in this state, the scale 100 moves together with the carriage 99. In this embodiment, during the partial erasing process, the solenoid 103 is energized to turn on the illumination lamp 3 at a low intensity, and the carriage 99 is driven at a low speed in the scanning direction X in response to a scanning instruction from the operator.

The scale 100 is provided with two sets of graduations 100a and 100b, as shown in FIG. 2d.

The first scale has a length of 300 mm from the image origin (equivalent to the length of the short side of A3 size paper), and a scale line (division line) is placed there.

■The scale (1 division) is 1 (2mm), 0, 10,
20.・A numerical value of -290 is marked every 5 scales, and the words "r middle groove" are printed in the area marked with the first scale.
The area marked with the first scale is colored "blue" to indicate that it is used for erasing the image within the designated area.

The second scale 100b has the same unit division as the first scale 100a, but the origin is 300, and every 5 scales is 310,
320.・・・・A numerical value of 600 is attached, and the area marked with the second scale is marked with “Outer Groove”, and the second
The area marked with a scale is used for erasing images outside the specified area (extracting images within the specified area).
It is said to be "red".

A cross-section of the eraser 24 is shown in FIG. 4a. eraser 24
is a long rod-shaped cathode ray tube 240. A reflecting mirror 242 whose cross section is approximately half an ellipse, and a filter 243 that matches the spectral distribution of the projected light to the characteristic spectrum of the photoreceptor. It is composed of a liquid crystal plate (liquid crystal shutter) 244 and a liquid crystal driver 245.

The cathode ray tube 240 has an extremely thin filament wire (cathode) placed in the center and covered with a cylindrical wire mesh (acceleration grid), and these are bonded to a transparent electrode film on the inner surface of the tube and a fluorescent film on top of it. This is a fluorescent light emitting tube enclosed in a glass tube.

The liquid crystal shutter 244 connects a light-transmitting segment electrode (light-transmitting, non-light-transmitting control electrode) to the photoreceptor drum 9 at 4 dots/mm.
The segment electrodes are arranged in two rows (A row and B row) in the direction along the axis of the photoconductor, that is, in the width direction of the photoreceptor, and are used to express characters.Segment electrodes and lead electrodes connected to the segment electrodes are printed on a transparent substrate. ing. A transparent substrate on which group electrodes each having a length of several segments are similarly arranged in the width direction of the photoreceptor faces the segment electrodes with a liquid crystal film in between. The segment electrodes, continuous lead electrodes, and group electrodes are connected to the liquid crystal driver board via a flexible printed circuit board. ``A liquid crystal driver 245 is mounted on the liquid crystal driver board.

When the Y-axis scale 100 is placed on the arm SA, the ends (0,300) of the scale lines of the first graduation 100a and the second graduation 100b of the scale 100 are placed at the end of the segment electrode row of the liquid crystal shutter 244. To match, a conical protrusion 5Aa2 is formed on the arm SA (there are two protrusions on the front and rear of the arm SA, each with a protrusion), and on both ends of the Y-axis scale, the surface side has a small diameter. Holes in the shape of a truncated cone with a large diameter on the back side] 00c1 and 100c2 are drilled. When the solenoid 103 is energized, the Y-axis scale 100 descends onto the arm SA, but at this time, the protrusion 5Aa2 enters the hole 100c2, and the Y-axis scale 100
Positioning in the Y direction is performed. As a result, the Y-axis scale accurately matches the erase area of the eraser 24.

FIG. 3 shows the operation board 42. Referring to FIG. 3, the operation board 42 includes a print start key 43. Numeric keypad 44. Clear & stop key 45. r, J key 4
4', Set number display 46, Copy number display 471
Interrupt key 489 Interrupt indicator 49. Paper feed force set selection key 502 Paper size display 51, 53. Paper feed selection display 52
゜54, magnification adjustment keys 55U, 55D, magnification display 56
, copy mode B (character print mode) selection key 57S
, mode B display 57L, copy mode A (combination copy mode of two originals) selection key 58S, mode A display 58 top 2 pages in numbers) print designation key 59S9 fractional page print display 59L 2 pages Print designation key 60S 1st page print display 60L 2nd page print position designation key 61S2
Page print position display 61L1 to 61L41 Page print position specification key 62S2 Page print position display 62L1
, 62L2 + scale print magnification specification key 63S9
Magnification specification display 63L, scale print specification key 64
S, scale print designation display 64L2, character print information selection key 65S, information selection display 65L, folding print designation key 66S, signature print designation display 66L9
Magnification print specification key 67S1 Magnification print specification display 67L, movement specification key 70+x.

70-x, 70+y and 70-y, movement amount indicator 71
x, 71y, a toner end indicator 72, a jam indicator 73, a paper end indicator 74, a scan designation key 105S for designating a scale scan for area reading, and a scan designation display 105L.

When mode A is designated with the mode A designation key 58S, in the first copy, the recording sheet that has been fixed is conveyed to the return path and stored in the intermediate tray 34, and in the second copy, the recording sheet is stored in the intermediate tray 34. is automatically selected as the paper feed tray, and recording is performed again on the previous recording sheet. The mode A (multiple transfer) specification is cleared every time two copy cycles are completed, so if you specify it only once, the recording sheet will be ejected after two copy cycles are executed. .

Image editing processing (delete an area of the first document in mode A,
If a composite copy in which a region of the second document is inserted therein is required, the mode 8 designation key 58S is used.

When you press key 58S and scan specification key 105,
Area specification becomes possible. In this input mode, the details will be described later, but the operator drives the scale 100 in the exposure scanning direction and return direction using the movement designation keys 70+X and 70-X, stops at the X position to be designated, and
Mark the Y position you are trying to specify on the first scale of scale 100 (
Read on the second scale (when cleaning the inside) or on the second scale (when cleaning the outside),
Enter the read value using the numeric keypad 44, and after manually inputting the numeric keypad, press ``,''
” key 44'.

This operation is performed for two diagonal points (two positions on the X axis) of the area to be specified.

In this case, when the first scale is used, image deletion within the designated area is automatically set, and when the second scale is used, image deletion outside the designated area is automatically set. The numerical information entered from the numeric keypad has three digits each, and is displayed on the set number of copies display 46 and the number of copies per copy display 47.

If a character print mode (a composite copy in which a region of the document is erased in mode B and a predetermined text is inserted therein) is required, the mode B designation key 57S is used. In this case as well, area designation is performed in the same manner as in the image editing process described above.

In normal copy mode where modes A and B are not specified, these movement designation keys 70+x, 70-x, 70+
y and 70-y are used to adjust the area outside the image area (erase area) in recording paper size area units.

The movement amount indicators 71x and 71y display numerical values of the cumulative deviation amount obtained by operating the movement designation key.

The page print designation key 60S is used to designate the number of pages to be printed.

The fractional page print designation key 59S is used to designate page printing in the form of fractions. When the numeric keypad 44 is operated while this key 59S is pressed, a page is printed in which the number entered using the tinkey 44 becomes the denominator of the fraction, and the number of times the document has been changed becomes the numerator of the fraction.

The page print position specification key 61S sets the page print position.
It is designated as one of the four corners of the recording paper, and 1
Each time the operation is performed, the display (lighting) changes from one of the displays 61L1 to 61L4 to the next, and the page print at the displayed position (lower cloth, lower left, upper right, upper left) is specified. be done.

The page print orientation key 62S specifies the orientation of page number printing, and can select one of vertical orientation and horizontal orientation.

The scale print designation key 64S is used to designate printing of scales on recording paper. When scale printing is specified with this key 64S and the scale print magnification specifying key 63S, which will be explained next, is not input, the scale to be printed is printed at the set copying magnification relative to the reference size. . As will be described later, this scaling is performed by generating data by thinning out a part of the scale pattern data previously stored in the ROM.

The scale print magnification designation key 63S is a key for inputting the magnification of the scale to be printed. If you input the magnification using the numeric keypad 44 while holding down this key, the manual power value on the numeric keypad 44 will indicate the size of the scale to be printed (magnification). is set as .

The folding print designation key 66S is used to designate printing of a fold mark at the center of the recording paper. If fold-fold printing is specified, a "+" mark will be placed at the center of the recording paper in the feeding direction and at the two upper and lower margins between the center and each edge.
is printed.

The character information selection key 65S is used to select one of a plurality of sentences pre-stored in the eraser control unit (241 in FIG. 4b) connected to the eraser 24. If the user operates the numeric keypad 44 while holding down the key 65S, the text specified by the numerical value entered using the numeric keypad 44 will be printed.

FIG. 4b shows the configuration of the eraser control unit 241. The control unit 241 includes a microprocessor 24LA that controls the entire control unit, a random access memory (RAM) 241D, and a read-only memory (ROM) that stores input character information and control information in advance.
241 E.

Input/output interface 241G, 241H, 2411
, a data bus connecting these, and a decoder 241G that generates a liquid crystal segment electrode activation signal from data from the input/output interface.

It consists of a bidirectional buffer 241F and a synchronization circuit 241B for interfacing with the microprocessor 80 of the main control section (FIG. 5).

The liquid crystal shutter 244 of the eraser 24 has a two-part (column A and column B) segment electrode array in which destination control segment electrodes are arranged over the maximum copy width at a pitch of 4 dots/ml per column. When a non-transparent energizing voltage is applied to each segment electrode, the liquid crystal in that area becomes non-transparent.
Light from the cathode ray tube 240 to the photoreceptor drum 9 is blocked.

Based on the information from the main control unit (80 to 88 in Figure 5),
Powered in two control modes.

First, in the normal erase mode (erase outside the document area and erase specified area within the document area), the selected segment electrodes in both the A and B columns are activated at the same time, as shown in FIG. 4d. The energizing time 2T is the time during which the surface of the photosensitive drum moves by one dot (4 dots/mm).

In the case of the mode for printing character information, as shown in FIG. 4c.

Row B, which is located downstream of row A, is energized one hour later than the timing for energizing row A.

One letter (including numbers for summer) has a vertical m dot and a horizontal m dot.
The segment electrode energizing voltage shown in FIGS. 4c and 4d is generated in synchronization with the drum synchronization pulse, which appears at one pulse per half-dot movement (T) of the photoreceptor surface. be done. In the mode that prints character information, the A column write information is 2 synchronization pulses.
The information written in column B is updated to that of the next line.
column is delayed by T. In the case of the erase mode, the write information in column A and the write information in column B are the same, and are updated to the next line every two synchronization pulses.

The image exposure shutter 200 has exactly the same structure as the liquid crystal shutter 244 of the eraser 24, and this shutter 200 is connected to a liquid crystal driver 77 shown in FIG. 6a, and this liquid crystal driver 77 is connected to a control unit 82 (see FIG. 6a). ing. Since the image exposure shutter 200 is for the purpose of blocking the projection of light from both the YK and K image setting areas onto the photosensitive drum, it is activated in the same manner as the erase mode of the liquid crystal shutter 244. Since there is no energization control like in the text information print mode, the control unit 82 of the image exposure shutter 200 does not hold text character information or text information. Accordingly, the configuration and control operation are simplified. Note that this control unit 82 controls the driver 77 based on data from the main control unit (80 to 88 in FIG. 5). Control operations etc. will be described later.

The image exposure shutter 200 is installed in the optical path of the original scanning light, and selectively energizes the liquid crystal segment electrodes based on information from the main controller (80 to 88) to selectively shut off the original scanning light. For example, the SL shown in FIG. 7a, T2-52.
PL in the recording area determined by the coordinates of T5, T3-P2.
When character printing in the area determined by the coordinates T5 is set using the operation unit, segment electrodes corresponding to the section Pi-P2 are selected and energized to be opaque in the copying width direction, and in the scanning direction, By activating the segment electrodes only in the T3-T4 section, PI, T3
-P2. Image exposure of the area determined by the coordinates of T5 is blocked. Note that required characters will be printed in this area by the eraser 24. Therefore, the image exposure shutter 200 is activated and controlled depending on the print mode (magnification print, page print, scale print, character print).

FIG. 5 schematically shows the electric circuit of the copying machine shown in FIG. 1.

Please refer to FIG. The main control unit is a microcomputer (CPU) 80. System controller 81. Counter 82. Read-only memory (ROM) 83. Read/write memory (RAM) 84° non-volatile read/write memory (NRA)
M)85. It consists of input/output ports (Ilo) 87, 88, etc.

A battery 90 is connected to the power line of the nonvolatile read/write memory 85 via a backup circuit 86 . A power line from a power supply unit 89 is connected in parallel to a battery 90 via a diode.

The input/output port 87 has the above-mentioned eraser control unit 2.
41 and an image exposure shutter control unit 82 are connected.

The input/output port 87 also includes a separate jam sensor.

Double feed detection sensor, P sensor, toner sensor, carriage 99 home position sensor, other sensors and switch units, jam indicator.

An operation board (operation panel) 42 and the like are connected.

The input/output port 88 includes a driver for driving various motors, a lamp regulator for controlling the lighting lamp 3, a fixing heater control unit, a high voltage power supply unit, a drum heater control unit, a servo motor control unit for driving various servo motors, a clutch & Solenoid drivers etc. are connected.

Counter 82 is used here to generate control timing for image exposure shutter 200.

FIG. 6a shows a specific configuration of a circuit including the counter 82 and the image exposure shutter driver 77.

See Figure 6a.

The counter 82 includes a microcomputer (hereinafter referred to as CP).
(abbreviated as U) 94, programmable interval timer 9
It has 3 etc. The timer 93 used here is an Intel 8253 (or 8254). Simply put, this counter has three built-in 16-bit counters, which are set in an internal control register. It operates in one of six modes depending on the content of the data. Each mode is as follows.

Mode 0: After setting the terminal count mode, the counter output state is low level L. When a value is set in the counter, it starts counting the clock input. When the terminal count is reached, the output state becomes high level and maintains that state.

Mode 1: Programmable One Shot Each timer's gate input functions as a trigger input in this mode. When there is a trigger input, it starts from the next clock. A wall shot pulse (L active) with a preset clock length appears at the output.

Mode 2: A pulse (L active) at one clock interval is outputted once every n clock inputs according to the value n preset in the rate generator register.

Mode 3: Rectangular wave rate generator Same as mode 2, but outputs a rectangular wave with a count number that is 1/2 of the set rate value.

Mode 4: When the software trigger strobe mode is set, the output is at a high level H, but the clock input starts counting by setting a value in the count register, and pulses at one clock interval (L active) are generated by counting up. Output only once.

In mode 5, the strobe gate terminal of the hardware trigger functions as a trigger, and counting starts at the rising edge of the trigger input. The output goes to low level L for one clock interval only once during terminal counting.

The counting input terminals CLKO, CLKI, and CLK2 of the three counters (0, 1, 2) of the programmable interval timer (hereinafter abbreviated as timer) 93 are connected to the output terminal of an oscillator O8C that generates clock pulses of a predetermined period. ing.

The output port PG1 of the CPU 94 is connected to the gate terminal GATHO of the counter O of the timer 93, and the OR gate G3
The output terminal of is the gate terminal GA of counter 2 of timer 93.
The output terminal of the OR gate G4 is connected to the gate terminal GATEI of the counter 1 of the timer 93. The two input terminals of the OR gate G3 include the output terminal of the AND gate G1 and the output port PG of the CPU94.
3 is connected to the two input terminals of the OR gate G4,
The output terminal of AND gate G2 and the output port PG5 of CPU94 are connected.

The output terminal 0UT1 of the timer 93 and the output port PG2 of the CPU are connected to the two input terminals of the AND gate G1, and the output terminal 0UT2 of the timer 93 and the output port PG4 of the CPU 94 are connected to the two input terminals of the AND gate G2. is connected. A large number of output ports of the CPU 94 are connected to the data line Do-D7 of the timer 93 and a control line (not shown).

The output terminal of the oscillator O8C is connected to the clock input terminal CLOCK of the driver 77 via the inverter INVI, and the output terminal ○UTO of the counter 0 of the timer 93 is connected to the latch control input terminal LATCH of the driver 77 via the inverter INV2. The output terminal ○UT2 of the counter 2 of the timer 93 serves as the signal output terminal (S-OUT), and the signal (data) input terminal 5-IN of the driver 77
It is connected to the.

The driver 77 includes 19 integrated circuits (next summer 11TD62801P) IC1 to IC19 having the same configuration.

Each integrated circuit consists of an 8-bit shift register, an 8-bit latch, a gate, and a driver, as shown in FIG. 6b, and has an output enable control terminal ENAB.
LE, latch control terminal LATCH, signal input terminal 5-I
N, a clock input terminal CLOCK, a reset control terminal RESET, a signal output terminal 5-OUT, and an 8-bit driver output terminal. Note that an overlined symbol in the figure indicates that the signal line is L active.

The latch control terminal LATCH of each integrated circuit is connected to the driver 77.
are commonly connected to the input terminals (LATCH) of both.

The clock input terminals of each integrated circuit are commonly connected to the input terminal (CLOCK) of the driver 77.

The input terminal (S-IN) of the driver 77 is connected to the signal input terminal 5-IN of the integrated circuit C1, and each integrated circuit I
C2, IC3, IC4, IC5,...

The signal input terminal 5-IN of ICI8 and IC19 is
Each integrated circuit ICI, IC2, IC3゜IC4,
..., signal output terminal 5- of IC17 and ICI8
Connected to OUT.

That is, the integrated circuits IC1 to ICI9 are connected in series with each other, thereby constructing a shift register having the number of bits equal to the maximum copy width. An image exposure shutter 200 is connected to the output terminal of each bit via a resistor.
segment electrodes are connected.

Therefore, at the time the latch signal appears, the bit holding a high level H (which is inverted at the output of the driver) energizes the segment electrode, and the bit holding a low level L energizes the segment electrode. Since it is deenergized, signal line 5
- By inputting light shielding information to IN as serial data with the number of bits equal to the maximum width of the copy, and applying a latch pulse when the information is completed, it is possible to selectively make any area of the maximum width of the copy non-exposed. can.

The copyable area on the surface of the photoreceptor drum 9 in one copy cycle is expanded and shown in FIG. 7a. Since the photosensitive drum 9 rotates at a constant speed, when viewed from a fixed position, the position of the surface of the photosensitive drum 9 in the scanning direction (indicated as the original scanning direction in the figure: X) can be expressed in terms of time. The vertical direction in the figure is the width direction, that is, the Y direction.

For example, when copying a B4 size original image in an apparatus capable of making A3 size copies, the original image copying area becomes smaller than the copyable area as shown in FIG. 7a. In this case, the area from the edge of the copyable area to the edge of the original image (
From time T1 to T2), leading edge erase (full width erase) is performed, and in the area where the original image exists (time T2 to T5), site erase (erasing areas other than the original width) is performed, and from the rear edge of the original image, the copyable area is erased. Area to the rear end (time T
5 to T6), rear end erase (full width erase) is performed. This is also done in most conventional general copiers.

When erasing or extracting a specific region of a document image for image editing (synthetic copying), it is necessary to further erase (erase an electrostatic latent image) within the region of the document image. That is, FIG. 7a shows the case of erasing an area, and the scanning direction (X direction) specified by time T3 to T4 is shown.
At the position, areas P1 to P2 in the width direction (Y direction) are erased. Since the eraser 24 is arranged so as to cover the entire area from 0 to M positions along the axis in the width direction, it is difficult to decide which area of the eraser 24 to energize or deenergize the segment electrodes.
By controlling , the erase area in the width direction is determined.

Text information print, page print, magnification print.

In the case of folded prints or scale prints,
The image exposure shutter 200 is controlled in the same way as the erase control of the eraser 24 in order to non-expose the print area (block the image light). however.

In the case of the eraser 24, the segment electrodes are controlled to transmit light in the erase area, but in the single image exposure shutter 200,
In the non-exposed area, the segment electrode is controlled to not transmit light.

Since the image exposure shutter 200 is also given information indicating which region of the segment electrode is to be energized, the exposure cutoff region in the width direction can also be expressed in terms of time. In this example, by giving predetermined control data to the counter 82 shown in FIG. 6a, the counter 82 controls the eraser driver 77.
Automatically generates a serial signal to energize.

Specifically, the control data that the CPU 80 sends to the CPU 94 includes position information on energization/de-energization of the eraser and switching between de-energization and energization. For example, each area of segment electrodes 1 to 20, 40 to 60 and 100 to 150 of the eraser is energized, and the other electrodes 21 to 39 and 61 to 9 are energized.
When 9 is de-energized, 21.40, 61 and 100 become control data.

The CPU 94 generates a signal (S-OUT) by sequentially setting this control data in the timer 93.

FIG. 6c shows an example of signal timing of each part within the counter 82. See Figure 6c. CPU80 to CP
When data is set in U94, mode setting (including count value setting) of counters 0 and 1 of timer 93 is first performed. The specific setting operation will be explained in detail later.

Next, one pulse is output to each of the output ports PG1 and PO2. This triggers counters O and 1 of timer 93. Counter 1 output terminal 0UT
1 is set to a low level L at the falling edge of the next clock pulse (CLK), and this counter 1 starts counting. After this, the CPU 94 sets the mode of the counter 2 (including setting the count value).

When the counting of the preset value in the counter 1 is completed, the output terminal ○UTI is inverted to a high level H.

This signal is applied to the gate terminal GATE2 of the counter 2 via the gates G1 and G3, thereby triggering the counter 2. Therefore, at the falling edge of the next clock pulse, the output terminal 0UT2 of the counter 2 is set to low level B, and the counter 2 starts counting. After this, the CPU 94 sets the mode of the counter 1 again.

When the counting of the preset value in the counter 2 is completed, the output terminal 0UT2 is inverted to a high level H.

This signal is applied to the gate terminal GATEI of counter 1 via gates G2 and G4, thereby triggering counter 1 again.

By repeating the above operations, a signal whose level is inverted at a timing corresponding to the data set by the CPU 80 is obtained at the output terminal of the counter 2, that is, the data output terminal 5-OUT of the counter 82. Inside the eraser driver 77, this signal is sequentially taken into the shift register in synchronization with the clock pulse.
When 300 pulses have passed since the start of the operation of the counter 82, data for erasing activation is set in all bits of the shift register. At the time of the first mode setting, the maximum value M (=30
0), which generates a latch pulse (LATCH) when the data set is complete.

The data in the shift register is latched by this latch pulse, and the energization of the segment electrodes is controlled according to the data.

Since the levels H and L of the signal 5-OUT indicate whether the segment electrode is on or off, that is, whether exposure is interrupted or not, by performing such control, it is possible to control exposure interruption at any position in the width direction of the photoreceptor drum. can do. Although FIG. 7a shows the simplest rectangular pattern area erasure, in the configuration of this embodiment, the counter 82 controls signal generation at high speed, so it is possible to erase an area with a complex shape. It is possible to set.

Here, the reason why counters 1 and 2 of the timer 93 are operated alternately is to provide time margin. In other words,
In order to enable area specification every 1 mm of optical system scanning, it is necessary to complete updating of the eraser energization information within 1 m5 ec, assuming that the moving speed of the photoreceptor drum surface is 1 mm/m5 ec. . In order to set the data of all the segment electrodes within 1m5ec, the period of the clock pulse output from the oscillator oSC should be approximately 5μsec.
Must be set to . However, the mode of timer 93
Since it takes at least several tens of microseconds to set the
Each time a mode set is performed, a considerable control error occurs in timing. Therefore, in this embodiment, the mode of counter 2 is set while counter 1 is operating,
The mode of counter 1 is set while counter 2 is operating.

In this example, the CPU 80 sets control data in the CPU 94 every time the photosensitive drum surface moves by 1 mm, and this is done in synchronization with the pulses output by the synchronous pulse generator 107.

As shown in FIG.
, x2 and two Y coordinate information yl.

When specifying by specifying y2, specify area extraction/erasure (by eraser 24) for each coordinate, and consider the combination of logical product (AND) and logical sum (OR) of the two coordinate systems. Figure 9a.

Figures 9b, 10a, 10b, 1'la.

There are eight types of area designation patterns shown in FIG. 11b, FIG. 12a, and FIG. 12b. That is, FIGS. 9a and 9b show area erasure of X1 to X2 and X
1 to
Figure 0b shows area deletion of X1 to X2 and area deletion of X1 to X2, respectively.
FIG. 11a and FIG. 11b show patterns obtained by logical product and logical sum regarding erasure with area extraction of X1 to X2 and area extraction of X1 to X2, respectively. Figures 12a and 12b show patterns obtained by logical product and logical sum, and FIGS. 12a and 12b respectively show patterns obtained by logical product and logical sum regarding erasure of region extraction of X1 to X2 and region extraction of X1 to X2. It shows.

Other combinations of patterns are possible.

However, the probability that a special pattern will be used is small, and if there are many types of patterns, there is a possibility that the operator will make a mistake in operation.
Only two patterns, the one shown in the figure and the pattern shown in Fig. 12b, are adopted, and in the case of specifying area erasure (erasing within a specified area), the pattern shown in Fig. 9a is used, and the pattern shown in Fig. 9a is used. In the case of outer erasure), the pattern of FIG. 12b is used.

When editing an image, it becomes necessary to move a specific area of the image to an arbitrary position. This type of image movement is possible with digital copying machines equipped with large memory capacities.
This can be easily done by data processing. However, since this is not possible with an ordinary copying machine, the following method is used in this embodiment.

Since the rotation of the moving photosensitive drum in the X-axis direction is the reference, the scan start timing of the optical scanning system and/or the sheet supply timing of the registration roller 17 are shifted from the standard timing synchronized with the rotation. In other words, if the scanning start timing of the optical scanning system is advanced, the position of the image formed on the photoreceptor drum 9 will move in the negative direction (to the left in the figure) with respect to the document scanning direction (X) in FIG. 7a. If the image is moved and the scanning start timing is delayed, the position of the image moves in the positive direction (to the right in the figure) with respect to the document scanning direction.

In addition, if the sheet feeding timing of the registration rollers is advanced, the recording sheet will be shifted to a position ahead of the normal position of the image on the photoreceptor, and the image will shift in the same way as when the original scanning start timing is delayed. If the sheet supply timing of the registration rollers is delayed, the image is moved in the same way as when the document scanning start timing is advanced. In this example, when moving the image by a relatively small distance, only the document scanning start timing is shifted, and when the moving distance is large, both the document scanning start timing and the sheet feeding timing of the registration rollers are shifted. ing.

Movement in the Y direction In this example, the position of the lens 7 provided in the optical scanning system is moved in the Y direction.
This is done by moving it along the axis. The principle of this movement is shown in Figure 7b. That is, in FIG. 7b, when the lens is at the position indicated by the solid line, each part of the document A, B, and C
The light emitted from the rays reaches positions A, B, and C on the photoreceptor, respectively.

When the lens moves to the position indicated by the two-dot chain line, each part of the document A,
The lights emitted from B and C pass through optical paths indicated by two-dot chain lines and reach positions A', B', and C' on the photoreceptor, respectively. That is, by moving the lens, the positional relationship between the image on the document and the image on the photoreceptor is shifted in the Y-axis direction.

Regarding magnification, as in the past, we change the positional relationship between the lens and mirror, adjust the magnification of the entire optical scanning system, and then calculate the difference between the reciprocal of the magnification and the scanning speed of the optical scanning system at the same magnification. Multiplication is performed, and the optical scanning system scans at a speed corresponding to the multiplication result. The amount of movement of the copy image when moving the image in the Y-axis direction is as follows, where d is the amount of lens movement and m is the variable magnification.

D=(1+m)d In Figures 13a, 13b, 13c, 13d, 13e, 13f, 13g, and 13h, the characters, etc. of the microcomputer (CPU) 80 are shown. The outline of the operation mainly focuses on the setting operation for printing and image compositing. The operation will be explained with reference to each figure. Note that the numbers of the processing steps to be explained are shown in parentheses.

When the power is turned on, each part is initialized (1), the status of each input port is read (2), and it is determined whether or not it is operable (3). If it is not ready, check whether there is an abnormality (4), and if there is an abnormality, set a display indicating the abnormality (5). After this, until you become a lady, (2) −
(3)-(4)-(2)-..., or (2)-(3)
-(4)-(5)-(2)-... The processing is performed in a loop.

When Ready is detected (3), the display indicating the abnormality is reset (6), various parameters in the standard mode are initially set in the predetermined registers (7), the copy ready display is set (8), and the operation board 42 is reset. Read the status of each part (key switches) (9). Check the status of the print start key 43 on the operation board 42 (10), and if there is no start instruction, then check the status of the numeric keypad 44 (21a).

If there is no input operation on the numeric keypad 44, the process proceeds to FIG. 13b, and the switch 58S (mode A) on flag and the switch 57S (mode B) on flag are checked (24). This flag is cleared in the initial state, so if any of the on flags are present, 1 edit (mode A
) or character print (mode B), the process advances to step (25) and the scan key-on flag is checked. This flag is also cleared in the initial state, so when the scan key-on flag is present, editing area designation is instructed, and the process proceeds to the designated area reading control shown in FIG. 13c.

However, if there is no edit key on flag, editing is not instructed, so move specifying keys 70+x, 70-x, 70+
Check y and 70-y (90.92 in Figure 13b)
．． 94 and 96), and if none of the movement designation keys are on, check the status of other keys (98) L
, if it is not on, read the status of the operation board 42 (
Return to step 9) and repeat this process. In other words, when no key is operated, (8) - (9) - (96
) -(98) -(8)-..., the same process is repeated in a loop, waiting for a key to be pressed.

When the movement key 70 +
Step (99) after waiting (99) for
). Similarly, when the movement key 70-X is pressed, after step (92), the values of parameters T2 and T5 are each decreased by 1 (93), and the minute time dT,
After waiting for a period of time (99), the process returns to step (9). When movement key 7o+y is pressed, step (94)
Next, the values of parameters S1 and S2 are each increased by 1 (95), and the process waits for the minute time dT1 (95).
After performing step (9), return to step (9). Movement key 7
When 02y is pressed, the values of parameters S1 and S2 are each decreased by 1 (96).
7) After waiting for a minute time dT1 (99), return to step (9).

In other words, if you operate the movement designation key in this case (edit/print not instructed state), the parameters T2°, T5. The values of Sl and S2 can be updated. These parameters correspond to the original image copy area, with reference to FIG. 7a. Therefore, by operating any of the movement designation keys, the area where the leading edge erase, site erase, and trailing edge erase are performed is adjusted.

Also, although not shown in the drawings, at the same time as these parameters T2 and T5 are updated.

The image is moved in the X direction, that is, the scanning start timing of the optical scanning system is updated. Furthermore, as the parameters S1 and S2 are updated, the image is moved in the Y direction, that is, the lens 7 is moved in the Y direction. The amount of movement is
The movement amount indicators 71x and 71y on the operation board 42 display numerical values.

*When the mode 8 designation key 58S is pressed, the process proceeds to (116) in FIG. 13F, and the state of the switch 583 on flag changes (117 to 119).

That is, when the key 58S is pressed in the initial state, the switch 583 on flag is set (117, 119
), if the key 58S is pressed while the on flag is set, the on flag is cleared (117,
118).

When the switch 588 on flag is set, the process proceeds to step (25) after step (24), where the scan key on flag is checked. When the scan key 105 is pressed while the switch 588 on flag is set, the scan key on flag is set in steps similar to steps 116 to 119 (not shown). Scan key 1 when the scan key on flag is present
When 05 is pressed, the flag is cleared).

**When the mode B designation key 57S is pressed, the process advances to (120) in FIG. 13F, and the state of the switch 578 on flag changes (121 to 123).

That is, when the key 57S is pressed in the initial state, the switch 578 on flag is set (121, 122
), if the key 57S is pressed while the on flag is set, the on flag is cleared (121,
123).

When the switch 573 on flag is set.

After step (24), the process proceeds to step (25), where the scan key-on flag is checked.

**If there is a switch 588 on flag or a switch 585 on flag, and the scan key on flag is set, the movement is specified in steps (26) and (36) of Fig. 13c via steps (24) to (25) (Fig. 13b). Keys 70+x and 70-x are checked to be on. If the movement designation key 70+x is turned on here, step (27)
When the scale scanning drive control in steps (32) to (32) is performed and the movement designation key 70-x is turned on, steps (37) to (4) are performed.
0) scale return drive control is performed.

That is, when the movement designation key 70+x is turned on, first refer to the contents of the scale scanning position counter27).
It is checked whether the content is greater than or equal to the scan direction limit value (for example, the value corresponding to the long side of A3 size paper) LMP. (Ride on the upper arm SA in Fig. 2b) and set the lamp 3 to low illuminance lighting (39). Next, the solenoid 103 is energized and the scale 100 is placed on the arm SA (30).
(FIG. 5) is set to low-speed normal rotation bias, and the synchronous pulse generator 107 (FIG. 5), which generates electric pulses in conjunction with the movement of the carriage 99, starts counting up the pulses generated (31). Next, a carriage scan flag is set (32). After starting the scanning drive of the carriage 99 in this manner, the process proceeds to steps (27) to (28) while the moving finger rectangle key 70+X is on. When the count value reaches the limit value LMP, the process proceeds to step (34) and the motor 10
6 and clear the carriage scan flag (35)
. When the movement designation key 70+x changes from on to off, the process proceeds to steps (26) - (33) - (34) - (35) and stops the motor 106 in the same way.

When the movement designation key 70-x is turned on, the content of the counter for detecting the scale scanning position is referenced, and if it indicates the home position (0), the motor 106 is not energized; otherwise, the motor 106 is not energized. 106 is set to low speed reverse bias to start a down count (39), and a carriage return flag is set (40). After starting the return drive of the carriage 99 in this way, while the movement designation key 70-x is on, steps (37) - (38-
■) and proceed. The count value is the home position HP value (
0), the process proceeds to step (42) and the motor 106
and clear the carriage return flag (43
). When the movement designation key 70-x changes from on to off,
Steps (36) - (37) - (42) - (43)
Then, the motor 106 is stopped in the same way.

With the scale drive control described above, the operator presses the switch 58S or 57S to set mode A (1i collection mode) or mode B (character print mode), presses the scan key to set the scale drive mode, and moves to the next step. Press the designated key 70+X to move the carriage 99.
The scale 100 is supported, the illumination lamp is turned on at low brightness, the graduations of the scale 100 are projected onto the document on the contact glass, and the scale 100 begins to move in the exposure scanning direction. Movement designation key 7
When you release 0+x (off), the scale stops there. When the movement designation key 70-x is pressed, the scale 100 moves in the return direction, and when the movement designation key 70-x is released (off), the scale stops there. In any case, once you press the movement designation key - 70 + x, the scan key 10
5 is pressed again to cancel the scale scanning mode, the solenoid 103 is energized and the illumination lamp 3 is lit at low brightness, so that the operator can see the scale projected image on the document.

The operator's required operations for erasing area (mode A) input and print area (mode B) are now summarized as follows.

1. Switch 58S or 573 on.

2. Turn on scan designation key 105.

3. Move designation key 70 + x on (then press 7 as necessary)
0-x ON) to stop the scale at one corner of the required area.

4. When erasing within the specified area in mode A, the first scale is 100.
At the scale value of a, or when erasing outside the specified area, the second
Enter the Y coordinate value of the corner using the numeric keypad 44 according to the scale value of the scale 100b, and then turn on the "," key 44'. In mode B, the same result is obtained no matter which scale is used.

5. Above 3. Similarly, stop the scale at another diagonal corner of the required area.

6. Enter as in 4 above.

7. Turn on the scan designation key 105 again to cancel the scale scanning mode.

＊＊＊＊Next, the operator's step 4 above. The area data input process in response to the operation will be explained. When the operator operates the numeric keypad 44, the numerical value assigned to the key pressed in step (22) of FIG. 13a is read into the numerical register. Next, when the "," key 44' is turned on, the process proceeds from step (44) to step (45) in FIG. 13c. Here, the above 4. Since 1=0 until the operation, the process proceeds to step (46) and stores the contents of the numerical register in the Yf register and the scale scan count value (scanning position detection value) in the Xf register, and in step (47) i=
1, wait for the dTl time to elapse in step (48), and then return to operation board reading (9). That is,
The operator moves the scale 100 to a desired position, inputs the scale value using the numeric keypad, and presses the "," key 44.
When you press ', the numeric keypad manual force value is stored in the Yf register, and
The scale position at that time is set in the Xf register.

Next, in the same way, 5. Move the rescaler to the next position and repeat step 6 above. When you enter the scale value with , this time, i
= 1, so step (45) to step (49
), set the contents of the numerical register to register Y7, and set the scale position to X! Set it in the register49), and set i to 0.
50a), and sets a read end flag indicating that input for one area has been completed (50b).

With the above steps, the coordinates of the diagonal corners of the desired area of the document have been read into the microprocessor 80.

＊＊＊＊＊The operator is in step 7 above. When the rescan designation key 105 is pressed, it is read in step (9) and the scan key on flag is cleared, and in response, control proceeds from step (25) to step (58) in FIG. 13b. Scale scanning end processing step (58
) - (59) - (60) - (61), return the scale 100 to the home position HP and close the solenoid 10.
3, and lamp 3 is turned off. And then the 13th d
The erase area shown in the figure is set, or the print area shown in FIG. 13e is set.

First, the setting of the erase area will be explained with reference to FIG. 13d. First, if there is a switch 583 on flag (mode A
If is set = 62) Check the presence or absence of the erase set flag (flag indicating that steps 71 to 81b: of setting the erase area have been executed), and if it is not set (not set), the read ends. The presence or absence of the flag (50b) is referred to. If there is no read end flag, area coordinate data has not yet been input, and the process proceeds to the key-in process shown in FIG. 13f and subsequent figures. If the read end flag is present, the area coordinate data has already been input.

In step 71, the contents of register Yf are compared with 300. If the content Yf of the Yf register is less than 300, the numerical value has been input based on the first graduation 100a of the scale 100, so it is assumed that "r middle groove" is specified, and the area of steps (72) to (77) After the determination, in steps (78a) to (81a), the image within the specified area is erased (erase area setting). In this, step (
72) And just in case, Y! The content Yf of the register is also compared with 300 to see if it is an input value based on the first scale 100a. If Yl is less than 300, both of the two-point inputs are based on the first scale 100a, so the calculated values AYf and AYt are set as Yf and Yf, respectively. If Yf is 300 or more, the coordinates input later are input based on the second scale 100b (outer groove), but in this case, the coordinates input earlier are given priority and calculated. Let the values AYf and A Y t be Yf and Y7300, respectively. That is, the value input later is updated to the value based on the first scale 100a (steps 72 to 74).
)0 Next, in steps (75) to (76), the eraser 24
The corresponding specified area range is determined and an image erasure area is set (78a) to (81a). In other words, erase is performed within a rectangular area specified by the X coordinate position within the range indicated by the contents of register Xf and register XQ, and the Y coordinate position within the range indicated by AYf and AYQ. Set eraser control data so that

In step (71) above, the contents of register Yf are set to 30.
As a result of comparison with 0, if Yf is 300 or more, the numerical value has been input based on the second scale 100b of the scale 100, so it is assumed that "outer groove" is specified, and steps (83) to (88) are performed. ), step (7) is performed.
In steps 8b) to (81b), the image outside the specified area is erased (erase area setting). In this step (83
) And just in case, Y! The content Yf of the register is also compared with 300 to see if it is an input value based on the second scale 100b. If Yf is 300 or more, both of the two input points are based on the second scale 100b, so the calculated value A
Yf and A Y t are Yf-300 and Y
Let it be t-300.

If Yf is less than 300, the coordinates input later will be
These are input based on the scale 100a (center groove), but in this case, the first input is given priority and the calculated values AYf and AYt are set as Yf-300 and Yf, respectively (step 72 ~74).

Next, in steps (75) to (7G), the designated area range corresponding to the eraser 24 is determined and the image erasing area is set (7
8b) to (81b).

Once the image deletion area is set in this manner, the process returns to step (9) for reading the operation board through other key-in processing shown in FIG. 13f and subsequent steps.

In step 62 of FIG. 13d, if the switch 58S on flag is not present (not mode A) or if the erase set flag is present (setting of the erase area in mode A has been completed), the process advances to step 66 to proceed to the next area. In order to enable the setting, the erase set flag is cleared and the switch 573 on flag is checked (67). If this flag is present, mode B is set, so the 13th
Proceed to print area settings in figure e. This print area setting is similar to the erase area setting described above. However, when setting the print area, the specified area is erased (letters inserted), so the coordinate input based on the number on the first scale of Kure 100 is written to the register as is, and the input based on the number on the second scale is written as is. , 300 is automatically subtracted from that value, that is, the value is changed to a value based on the first scale.

Setting the print area in this way allows you to print copies (
In mode B), the image exposure shutter 200 blocks image light in the print area, and the eraser 24 writes text information in that area.

The operator's operations and the control of the microprocessor 80 described above set the erase area for editing (mode A) and/or set the character writing area (mode B). When setting the area in mode A,
It should be noted that whether to erase the inside or outside of the designated square area is determined by the human power value of the numeric keypad when first specifying one corner of the square area. The first scale 100a and the second scale toob of the scale 100 have different scale values, and are assigned to different processing modes (nakazuke, sotogroove), so they can be automatically set using the manual value of the numeric keypad. The processing mode is set. The operator does not need to perform key operations to specify the mode (inner or outer groove).

When the print start key 43 is pressed, step (1)
0) -(11) -(12) -(13) -(14
) −(15) −(16) −(17) −(1g)
-(19) -(20)-(8)-(9)-...,
Or step (10) (16) - (17') - (1
8) -(19) -(20) -(13)-(14)
- . . . and performs the copy process. In the start cycle process J (12), the processes necessary to start the copy process are performed.

Most of the copy process, including controlling the eraser 24,
"1 copy processing J (13)" is carried out. That is, the timing pulse (not shown) that is output every minute rotation of the photosensitive drum 9 is constantly counted, and the timing is grasped by checking the value. Control is performed according to each timing. Control of the eraser 24 is started from timing T1 of tip erase.Every time the erase area changes, that is, in mode A, timing T1, T2, T3... T4.T5 and T
6, the data set in the eraser driver 245 is updated.

In the case of the print mode (mode B), if the small diagonal square in FIG. 7a is set as the print area, each time the erase area changes, that is, timings Tl, T2 . T3゜T4. At T5 and T6, the data set in the eraser driver 245 is updated, and between timings T3 and T4, a character record that also serves as an erase operation is performed in which the character information part is shielded from light and the other parts are transparent within the diagonal small square. It is done.

Control unit 241 (Figure 4b) (7) ROM24
1E stores text information by number. Step 2 in Figure 13a is used to input a number that specifies one piece of text information.
1d and 21e.

That is, the numeric keypad 44 is pressed while the switch 65S is pressed.
When is operated, this numeric keypad manual is stored in the text No. register, and 1 copy processing in mode B (13)
When the data enters, it is read out by the microprocessor 80 and provided to the control unit 241. Control unit 241
provides image information (pixels) for each line of text information to the liquid crystal driver 245 based on this information when scanning enters the print area.

When the page print switch 583 on flag is present,
The microprocessor 80 performs ■copy processing (13: first
3a), the number of pages (original replacement number) in the position specified by the switch 62S is printed at the position specified by the switch 61S.

This means that when the exposure scan advances to the page print position,
This is done by giving data for shielding the page print area to the control unit 82 of the image exposure shutter 200, and giving page print area data and print character data (including orientation data) to the erase control unit 241.

The processing when the fractional page print switch 593 on flag is present is the same as the page print processing described above, except that the print information is the number of times of document replacement/set number of document sheets.

Note that since page printing and fractional page printing are performed alternatively, steps 124 to 1 in Figures 13f and 13g are performed.
27 and steps 128 to 130, when page printing is set, the switch 608 on flag is set and the switch 59S on flag is cleared, and when fractional page printing is set, the switch 593 on flag is set and the switch 608 on flag is cleared. I have to.

Scale print settings are from step 141 of step 13g.
143 and is completed by setting the switch 643 on flag. When proceeding to the 1 copy process (13) with this flag set, the microprocessor 80 sends the area data and scale magnification for printing the scale to the area corresponding to the bottom margin and the right margin of the recording paper to the control unit 24.
Send to 1. Further, the control unit 82 is given image light blocking information of the area specified by the area data. The control unit 241 controls the area indicated by the area data.

Information for printing the vertical scale data and horizontal scale data stored in the ROM 24LD at a specified magnification is created and given to the driver 245.

The control unit 82 blocks exposure of the scale writing area based on the provided image light blocking information.

The fold print settings are performed in steps 149 to 13g in Figure 13g.
At step 151, the switch 668 on flag is set and the process ends. When this flag exists, in the 1 copy process (13), the microprocessor 80 gives the fold position data and fold print instruction data to the erase control unit 241, and the image exposure shutter control unit 82 receives the fold position data. Provides information to block light from the specified area. The control unit 241 creates information for printing the folding part "+" stored in the ROM 24LD in the area indicated by the folding part position data, and provides it to the driver 245.

The control unit 82 blocks exposure of the folded writing area based on the provided image light blocking information.

Setting the magnification print is from step 157 in Figure 13h.
At step 160, the switch 673 on flag is set and the process ends. When this flag exists, in the 1 copy process (13), the microprocessor 80 gives magnification print instruction data to the erase control unit 241, and the image exposure shutter control unit 82 receives an area previously allocated for printing the copy magnification information. Provides information on shading.

The settings of various flags based on key-in are shown in FIGS. 13f, t3g, and 13h. Note that these drawings show only parts related to implementation of the present invention. For example, in the process in response to pressing the double-sided copy instruction switch 67S, whose control flow is not shown, when this switch is pressed.

The presence or absence of the switch 678 on flag is checked, and if it is not present, the flag is set and the display 68S is turned on.

When the switch 673 on flag is present, it is cleared and the indicator 68S is turned off. When the process proceeds to the first copy process (13) with the switch 678 on flag present, the microprocessor 80 erases the erase area (set in the flowchart of FIG. 13d) when copying the first original, and When copying a document, the erase control unit 241 sends instruction data to erase outside the erase area.
give to Further, when copying the first original, paper transport control is performed to send the recording paper to the intermediate tray, and when copying the second original, paper transport control is performed to supply the recording paper from the intermediate tray and send it out to the paper discharge tray.

In the copy process without switch 573 on flag and switch 588 on flag, steps (91), (93), (95), (
The recording paper area ((Sl, T2), (
S2. T5): If there is no adjustment, erasing outside the standard area for the recording paper size is performed.

FIG. 14 shows the operation of the CPU 94 within the counter 82. This will be explained with reference to FIG. When the power is turned on, initial settings are made and data arrives from the CPU 80.

When data arrives, read that one line of data,
Depending on the content, it operates as follows.

First, set counter 0 of timer 93 to mode 5,
Counter 1 of timer 93 is set to mode 1, and counter 2 of timer 93 is set to mode 1. Next, the maximum value M is set in the count register of counter 0 of the timer 93, the counter flag TF is cleared, and the first data of the input data is read. The data is sent to timer 9.
3 in the count register of counter 1, and output one short-period pulse to output ports PG1 and PO2.

At this point, counters O and 1 of timer 93 start operating.

The CPU 94 reads the next data and inverts the state of the flag TF. The subsequent processing is repeated in a loop until the input port PG6 becomes the low level L, that is, until the counter 0 of the timer 93 finishes counting the maximum value M previously set.

First, flag TF is checked, and if it is 0, the read data is set in the count register of counter 1 of timer 93, and if flag TF is 1.

The read data is set in the count register of counter 2 of timer 93. If there is next data, read it, invert the state of flag TF, and repeat the above process6.
That is, in this loop-like process, the mode setting of counter 1 and counter 2 of the timer 93 is repeated alternately. This mode setting control provides a signal as shown in FIG. 6c.

The exposure cutoff data to be set in the counter 82 is as follows:
They are all set in the area allocated as bitmap memory in the RAM 84 of the main control unit before the copy operation begins. When the copy operation begins, for each scanning line, the CPU 80 reads one line of data from the address corresponding to the current scanning line in the bitmap memory and provides it to the CPU 94.

15a and 15b show C of the control unit 241.
A schematic operation of the PU241A is shown. See each episode. When the power is turned on, initial settings are made and data from the CPU 80 is waited for. When data is received, the data is identified and the following processing is performed depending on the result.

Note that a part of the RAM 2410 of the control unit 241 is provided with a memory in which energization/deenergization of each segment electrode of the image exposure shutter 200 at each row timing is associated in a one-to-one manner, that is, a bitmap memory. ing. Each address of this bitmap memory corresponds to the position of each minute point in the maximum copy area.

To specify an erase area, after clearing the contents of the buffer memory, write to the address corresponding to the erase area in the buffer memory according to the size of the recording sheet and the erase area determined by the operator's area specification and copying magnification. Data indicating segment electrode energization, that is, erasing, is set.

If information recording is specified, a series of pattern data corresponding to the text specification No. is read from a predetermined address of the ROM 241H and stored at an address of the buffer memory corresponding to the area information. Note that each data of the character pattern set in the buffer memory here is recorded at the recording dot (
The dots (black) correspond to the deenergization of the segment electrodes, and the other dots (white) correspond to the energization of the segment electrodes.

If magnification printing is specified, input the information on the copy magnification set at that time, read the pattern data of each character indicating the value from the ROM 241E, and place it in the position previously allocated for printing the magnification data (in this example). Then, set it to a predetermined memory address in the buffer memory corresponding to the upper right corner of the recording sheet. By this, for example, "M=0.7" is stored in a predetermined area in the buffer memory.
6'' and information indicating the copy magnification (0.76x) are set.

If folding pudding 1- is specified, first read the size of the recording sheet and determine the position where folding should be recorded. This position is
Six positions are defined, for example, at the center position in the longitudinal direction of the recording sheet, and intermediate positions between the center position and both ends, and at a distance of, for example, 3 mm inward from both ends in the width direction. Then, the character pattern data of the folding part It+It is read from the ROM 241E, and set in each memory of the address corresponding to the six positions determined previously in the buffer memory.

To specify page printing, read the current page information and store the pattern data corresponding to the character of that number in the ROM 241E.
Read from. Then, the pattern data is set in the buffer memory at an address corresponding to pre-designated position information (indicating either the upper right edge, the upper left edge, the lower right edge, or the lower left edge of the recording sheet). Then, set the page flag.

If fractional page printing is specified, the following processing is added in addition to the page printing processing described above. The numerical character pattern data of It/l# and the maximum number of pages M (specified in advance with the numeric keypad 44) are read from the ROM 241E and set at a predetermined address in the buffer memory. In addition, r
The position where r/n and M are recorded is to the right of the position where the page is recorded.

If page update is specified (output every time the document is changed), check the page flag. If there is a page flag, the same processing as when specifying page print is performed. The page counter on the CPU 80 side is updated before the page update is specified, so
Every time there is a page update instruction, the contents of the page position in the buffer memory (2410) are updated to new pattern data.

If scale printing is specified, next check whether the scale magnification is specified. 633 If there is no on flag, the recording magnification of the scale is not specified, so the copy magnification at that time is read and set in the scale magnification register. In other words, if the scale magnification is not specified, the copy magnification is automatically set as the scale magnification.

Next, the contents of the scale magnification register are divided by the maximum magnification (the maximum value of the copy magnification and the scale magnification).

In this example, the maximum magnification is set to 1.5. Therefore,
After performing this operation, the contents of the scale magnification register are converted to a value with the maximum magnification being 1.

Next, read the size of the recording sheet and determine the position where the scale should be recorded. This position spans approximately the entire length of the bottom white portion and right margin portion of the recording sheet. Furthermore.

Scale character pattern (including tick marks and numbers)
is read from the ROM 241E and set at a predetermined address in the buffer memory.

However, before storing it in the buffer memory, a part of the pattern data is thinned out according to the contents of the scale factor register. In this example, scale pattern data is stored in the ROM 241E in advance in a size corresponding to the maximum magnification. Therefore, by setting the maximum magnification to 100% and performing thinning according to the set magnification, pattern data with a scale of a predetermined magnification can be obtained.

When a start is specified, first set the address pointer to the value of the start address of the buffer memory, and then set the start timing (when the exposure start position on the photoreceptor is at the eraser 24).
). When the start timing comes, the address pointer is referred to, one line of data is read from the buffer memory, and it is set as the energization/deenergization control data of the eraser 24. Next, the value of the address pointer is updated to the value of the start address of the next line, and the line counter is incremented by 1. Refer to the line counter, and if the value does not exceed the last line, wait for the timing of the next line, read the data for one line indicated by the address pointer from the buffer memory again, and then Set in the control data of the eraser 24. Thereafter, this process is repeated until the value of the line counter exceeds the final line.

Therefore, in a line that includes character pattern information such as a copy magnification of 9 pages, a scale, and a fold, the control data that includes erase information and character pattern information is
4, thereby performing erase control and character print control.

Next, the relationship between operator operations and the corresponding copies obtained will be summarized.

1° Normal copy mode: When the operator presses the print key 43 with the double-sided copy designation display 68S shown in FIG. , the magnification set using the magnification adjustment keys 55U and 55D is copied. Since this copy control operation is well known, detailed explanation will be omitted.

2. Double-sided mode: When the operator presses the switch 67S, the display 67L lights up. With the display 67L lit, press the print key to copy the first original.

Copies are stored face down in the intermediate tray. Next, the operator sets the second document and presses the print key. A copy is obtained in which the second original is recorded on the back side of the copy of the first original.

3. Mode B copy mode: When the operator presses the switch 57S, the display 57L lights up (Mode B setting). When the scan key 105S is pressed after the display 57L lights up, the display 105L lights up (scan mode setting). In this state, the operator operates switches 70±X and 70±y to set scale 10.
0 to the desired position, input the y coordinate (scale graduation) using the numeric keypad 44, and press the switch 44'. As a result, the coordinates of the first corner of the print area are read into the copying machine. Then the operator also switches 70±x, 70±y
Operate the scale 100 to the desired position, input the y coordinate (scale graduation) using the numeric keypad 44, and press switch 4.
Press 4'. As a result, the coordinates of the second corner (diagonal corner) of the print area are read into the copying machine. Next, when the operator presses the scan key 105S, the display 105L goes out and the carriage 99 returns to the home position. When the operator inputs a numerical value using the numeric keypad 44 while holding down the information input switch 65S, the numerical value is read into the copying machine as print text designation data. When the operator presses the print key 43, a copy is obtained in which the designated text is written in the designated area of the original at the copy setting magnification.

4. Copy mode of mode A: When the operator presses the switch 58S, the display 58L lights up (mode A setting). Erase area (or extraction area)
The settings are as in 3. above. Do the same thing. However, in this area setting, whether to erase the inside or outside of the set area is determined depending on whether the first scale or the second scale of the scale 100 is used. When you set the first original and press the print key 43, the original is placed within the setting area (or outside the setting area).
The erased copy is stored in the intermediate tray. When you set the second original and press the print key 43, the copy on the intermediate tray that erases the area inside (or outside the setting area) of the first original is added to the copy that erases the area outside (or inside) the area of the second original. A composite copy of the erased image is obtained.

5. Combined mode of modes B and A: The operator uses 3. above. After performing the above input operation and the above 4° input operation, the print key 43 is pressed. and the first
After completing the copying of the yK manuscript, the switch 57S is operated to turn off the indicator light 57L, and the second manuscript is copied.

Or 4 above. The input operation of 3° is performed to copy the first original, and then the input operation of 3° is performed to copy the second original.

6. Above 2. and 3° combination mode: Operator should use the above 2. After performing the input operation of and the input operation of 3 degrees above, press the print key. You will get a copy with the same text printed on the front and back. After copying the first draft,
Further, when the operation 3 is performed, another text is printed on the copy (back side) of the second original.

7. Above 2. and 4. Combined use mode: This mode makes a composite copy of two originals (1st and 2nd f! drafts) on the front side, and a composite copy of two originals (3rd and 4th originals) on the back side. this is.

In duplex mode, the front side is copied in mode A, and the back side is copied in mode A. 6. One of the front side and the back side is in mode It can be canceled as A.

8. 2 above. and 5. Combination mode: In duplex mode copying, the above 5. is used for both front side copying and back side copying. Perform input operations.

9. Page print mode: The operator performs the above 1. ~8. In addition to the mode setting operation, press the switch 60S to light the display 60L,
Display device 61L that indicates the desired position by operating the switch 61S
1 to 61L4 are lit. Further, the user operates the switch 62S to light up the display 62L1 or 62L2 indicating the desired number of pages and the print orientation. When you press the print key 43,
The number of document changes is printed at the set position in the set orientation, and the number of times the original is replaced is printed in the set position, and the number of times the document is replaced is printed in the set position, and the number of times the original is replaced is printed in the set position, and the number of times the document is replaced is printed in the set position, and the number of times the document is replaced is printed in the set position, and the number of times the document is replaced is printed in the set position, and the number of times the document is replaced is printed in the set position, and the number of times the document is replaced is printed in the set position, and the number of times the original is replaced is printed in the set position. ~8. A copy with the image determined by the mode is obtained.

10. Fractional page print mode: The operator performs the above 1. ~8. In addition to the mode setting operation, press the switch 59S to turn on the display 60L, keep the switch 59S pressed and operate the numeric keypad 44 to input the number of original sheets, and operate the switch 61S to display the desired position on the display 61L1. ~Turn on 61L4. Also, the display 62L indicates the desired number of pages to be printed by operating the switch 62S! Or turn on 62L2. When the print key 43 is pressed, the [number of originals replaced/number of input originals] is printed at the set position in the set orientation, and the above 1.
．． ~8. A copy with the image determined by the mode is obtained.

11. Scale print mode: The operator performs the above 1. ~10. In addition to the mode setting operation, the switch 64S is pressed to light up the display 60L. When scale printing at the set copy magnification is fine,
Press the print key 43 as it is. When you want to change the scale magnification, press the switch 63S to change the scale magnification.
S is turned on, and the scale recording magnification is input by operating the numeric keypad 44 while holding down the switch 63S. When the print key 43 is pressed, the scale is printed on the right and bottom margins of the recording paper at the current copying magnification or specified magnification. An image determined by the mode .about.10 is recorded and a copy obtained.

12. Fold-fold printing mode: The operator performs the above 1. ~11. In addition to the mode setting operation, the switch 66S is pressed to light the display 66L. When the print key 43 is pressed, "+j" marks are printed at six locations on the recording paper in the exposure scanning direction, at the center, at the middle between the center and both ends, and at the upper and lower margins. In addition, a copy is obtained in which the image determined by the modes 1. to 11. above is recorded.

13. Copy magnification print mode: The operator selects the above 1. ~12. In addition to the mode setting operation, the switch 67S is pressed to light up the display 67L. When the print key 43 is pressed, the copy magnification at that time is printed in 1% increments, such as rM=o, 76J, at a predetermined position in the margin of the recording paper, and the above 1. ~12.
A copy with the image determined by the mode is obtained.

・・・In addition, Example L explained above
: t; l, N r - Place the scale 100 on the exposure scanning carriage 99, drive this scale 100 in the exposure scanning direction, stop at the desired exposure scanning position, and press the numeric keypad 44 and comma key 44'. By inputting the coordinate information of one axis and reading the coordinates of the other axis as carriage position information, the corner coordinates for specifying area 5 can be input. With reference to the scales 41X and 41Y, coordinate data for both axes may be input using the numeric keypad 44 or the like.

In the above embodiment, the liquid crystal shutter 200 is also used as an image exposure shutter, but the image exposure is partially blocked by selectively driving one or more shutter plates to a desired position. Good too.

(2) Effect In any case, in the present invention, the eraser 24 is used as the erase light source 241 and the liquid crystal shutter 244.

The liquid crystal shutter 244 has light transmission control electrodes, that is, segment electrodes arranged in the width direction of the photoreceptor, and a light transmission control voltage is selectively applied to each segment electrode to perform erase control and scale in the width direction of the photoreceptor. Since character printing control including patterns is performed, it is possible to obtain a copy with a scale of any pre-specified size added from an original without a scale.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the appearance of an embodiment of the present invention. 2a is a longitudinal sectional view of the copying apparatus shown in FIG. 1;
The figure is an enlarged sectional view showing elements around the photoreceptor drum, FIG. 2c is a partial enlarged sectional view showing details of the illumination lamp 3 shown in FIG. 1, and FIG. 2d is the scale shown in FIG. 2c. 1
00 is a plan view. FIG. 3 is a partially enlarged plan view showing the operation panel 42 of the copying machine shown in FIG. FIG. 4a is a cross-sectional view of the eraser 24, and FIG. 4b is a block diagram showing electrical elements connected to the eraser 24. Fig. 4c is a time chart showing the energizing signal per dot when the eraser 2.4 is energized in the character print mode, and Fig. 4d is a time chart showing the energizing signal per dot when the eraser 24 is energized in the erase mode. 3 is a time chart showing the energizing signal of FIG. FIG. 5 is a block diagram showing the electrical circuit configuration of the copying machine shown in FIG. 1. FIG. 6a is a block diagram showing the specific configuration of the counter 82 and image exposure shutter driver 77 shown in FIG. 5, FIG. 6b is a block diagram showing the electric circuit configuration of the integrated circuit C1 shown in FIG. FIG. 6c is a timing chart showing an example of signal states of each part of the counter 82. FIG. 7a is a plan view showing the relationship between the copyable area on the photosensitive drum and the area included therein. FIG. 7b is a plan view showing the optical positional relationship between the original, the lens, and the photoreceptor. FIG. 8 is a plan view showing the original on the contact glass 1 and the coordinates of a part of the original. Figures 9a, 9b, 10a and 10b. FIGS. 11a, 11b, 12a and 12b are schematic diagrams showing different patterns formed by combinations of designated areas and erase areas. 13a, 13b, 13c, 13d, 13e, 13f, 13g, and 13h are flowcharts showing the general operation of the microcomputer 80 shown in FIG. 5. FIG. 14 shows the microcomputer 94 shown in FIG. 6a.
2 is a flowchart showing a schematic operation of the FIG. 15a and 15b are flowcharts showing the general operation of the microcomputer 241A shown in FIG. 4b. 1: Contact glass 2: Pressure plate 3: Illumination lamp 4: First mirror 5: Second mirror 6: Third mirror 7: Lens
8: Fourth mirror 9: Photosensitive drum 10: Developer unit 11. 12: Paper feed cassette 13. 15: Paper feed roller 14. 16, 18: Feed roller 17: Registration roller 19: Transfer charger 20
: Separation charger 21: Fixing unit 20: Separation charger 21: Fixing unit 22: Cleaning unit 23: Charging charger 24: Eraser 241: Cathode ray tube (erase light source) 244: Liquid crystal shutter 245: Liquid crystal driver (liquid crystal energizing means) ) 31: Conveying direction control mechanism 32: Conveying roller 33: Conveying belt 34: Intermediate tray 41x: X scale 41y: Y scale 42: Operation board 43 Ni printing start key 44: Numeric keypad 46: Set number display 47: Number of copies Display 70, +x, 70-x, 70+y, 70-y: Movement designation keys 71+x, 70+y: Movement amount display 77: Image exposure shutter driver 80: Microcomputer 82: Counter 93: Programmable interval timer 94: Microcomputer 99 :1st carriage 100 scale 100a:1st scale 100b
: Second scale 101, SA double scale support arm 102: Axis 103: Solenoid 104:
Tension coil spring 105 Niscan instruction key 106: First carriage drive motor 107: Synchronous pulse generator

Claims (2)

[Claims] (1) Charging means for uniformly charging the photoreceptor; exposure means for forming an electrostatic latent image by projecting light corresponding to the optical image of the document onto the charged surface; and developing means for developing the electrostatic latent image In a copying apparatus equipped with: an erase light source arranged in the width direction of the photoreceptor that exposes the surface of the photoreceptor after charging and before development; a light transmission control electrode disposed between the erase light source and the photoreceptor and divided in the width direction; arranged liquid crystal shutters; selective exposure means that is located between the light source of the exposure means and the photoreceptor and prohibits exposure of the photoreceptor in at least part of its width; scale size indicating means;
and generating predetermined scale pattern information having a size according to the instruction from the scale size instruction means, controlling the selective exposure means to prohibit exposure of a part of the photoreceptor, and generating the scale pattern information. A copying apparatus comprising: a liquid crystal energizing means for selectively applying a light transmission setting voltage and a light non-transmission setting voltage to each of the light transmission control electrodes of the liquid crystal shutter according to the invention. (2) The scale size indicating means includes numbers 0, 1, 2,
Claim 1, comprising ten key switches respectively associated with keys 3, 4, 5, 6, 7, 8 and 9.
Copying device as described in section.