JPS61246773A - Copying device - Google Patents

Abstract

PURPOSE:To print out characters so as to superpose them to an original image by controlling the light transmission/nontransmission of a segment by informa tion corresponding to a fixed pattern such as characters. CONSTITUTION:Fixed pattern information is stored in a ROM 241E and read out of a CPU 241A by an indication from a microprocessor 80. When an erasing portion enters into a printing area, the CPU 241A sends picture information to a liquid crystal driver 245 on the basis of said information, and when an exposing portion enters into the printing area with the delay of a prescribed period, a processor 80 interrupts the exposure to the picture in the area. Namely, the latent image of characters is destaticized by irradiating an electrostatic latent image due to the image light of the original to said latent image of characters, so that the reflected light of an original projected to an area sur rounding the latent image of the characters is interrupted by a picture exposing shutter. The electrostatic latent image of the characters is formed on a photosen sitive drum by the action of an eraser 24 and a crystal shutter 244 and the copy to which the fixed patterns such as characters are superposed to the pic ture image is made possible.

Description

Detailed Description of the Invention ■Field of the Invention The present invention projects light corresponding to the optical image of an original onto a photoreceptor to form an electrostatic latent image, which is then developed to form a visible image on a recording sheet. With regard to copying devices that transfer images, it is possible to expose the photoreceptor area outside the original area to erase the development of the extra area, record only a part of the original image, and to The present invention relates to an improvement in an erase device that performs erasing processing for a collection of one image III to be erased.

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, for example, 3m
Image extraction of the desired area using the corner rectangular area as the minimum unit (
However, the smallest unit that can be set in a light emitting diode array, e.g. 3II11
Even corners may be too large for erasing outside the original image or setting the area for image extraction (erase) editing when copying at any magnification. When using a conventional erase device, there is a problem that the minimum unit is too large. Another problem is that the number of wiring connections for one light emitting diode array is large and complicated.

For example, a light-transmissive liquid crystal plate having a segment electrode array capable of expressing characters, etc. is inserted between the erase light source and the photoreceptor, and selective voltage application control of the segment electrode array is necessary. improved by doing
Erase control of arbitrary areas and projection of character images can be controlled. According to this, it is possible to erase an image in a partial area of a document in one copy cycle and obtain a copy with characters printed thereon. However, when printing one character, the image of the character background in the one character print area is erased, so no original image is formed there.Also, when the character print area is exposed with the original image, the latent character image of the original is erased. It is exposed to image light and disappears, leaving no latent character image. Therefore, it is not possible to obtain a copy in which the original image and characters are superimposed.

■Purpose of the Invention The first object of the present invention is to provide a copying device capable of printing a fixed pattern such as text over a 1M draft image.
A second object of the present invention is to provide a copying device of an erase device that allows easy setting of erase areas in finer units, simple wiring connections, and a compact design.

(2) Structure of the Invention In order to achieve the above object, in the present invention, the surface of the photoreceptor is exposed to light after charging and before development. An erase light source arranged in the width direction of the photoreceptor; a liquid crystal shutter located between the erase light source and the photoreceptor and having light transmission control electrodes divided and arranged in the width direction; a light transmission setting voltage and a light transmission control electrode arranged on each of the light transmission control electrodes; Liquid crystal activation means for selectively applying a light-opaque setting voltage:
The apparatus further includes a sheet refeeding means for guiding the recording sheet after the visible image has been transferred to the photoreceptor again using the visible image transfer surface as the transfer surface.

According to this, by controlling light transmission/non-transmission of these segments with information corresponding to a fixed pattern such as text characters, which may be done first, the pattern can be printed on a recording sheet. This recording sheet is re-fed with the printed side as the transfer surface, and the visible image based on the image light is transferred as is (or the recording sheet to which the visible image based on the single image light has been transferred is transferred to the visible image). By refeeding the paper using the side with the side as the transfer surface, and then printing a fixed pattern such as text characters).

It is possible to obtain a copy in which a fixed pattern such as text characters is superimposed on the image.

Moreover, the segmented liquid crystal unit can be formed using normal liquid crystal panel manufacturing technology to control the control electrodes that control light transmission and non-transmission by dividing them into small segments and integrated with the lead leads, so the lead leads and the segment electrodes are continuous. Therefore, the number of electrical connection points can be significantly reduced, and the reliability and ease of manufacturing of the device can be increased.

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 photoreceptor drum. ,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 the outline of the Y-axis direction, an X scale (minimum unit: 1 mm) 41x along the document scanning direction X and a Y scale (minimum unit: 1 mm) 41y along the Y-axis direction are arranged. There is. On the X scale 41x and Y scale 41y.

In both cases, one corner 40 of the contact glass 1 is set as a reference point (zero point), and numerical values increasing in each axis direction are assigned.

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. In addition, in order to keep the optical path length constant, the first carriage (99:
FIG. 2c) shows the second mirror 5. It moves at twice the speed of the second carriage (not shown) on which the third mirror 6 and the like are mounted.

The image light from the original is transmitted to the first mirror 4. The light is guided to the surface of the photosensitive drum 9 through an optical system composed of a second mirror 5, 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 provided to prevent the erase device (eraser) 24 from exposing the erase exposure area in the character print mode to one image light during copying in the character print mode, which will be described later.

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 the image light of the original, the potential of that surface changes depending on the intensity of the irradiated light due to a photoconductive phenomenon. A distribution, ie, an electrostatic latent 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 bring it to white level potential.

Therefore, even if the area of the photosensitive drum 9 erased by the eraser 24 is irradiated with light obtained from the black image of the original, the potential of that area remains at its own level, and the black image will be reproduced in that area. In addition, in the single character print mode, the eraser 24 controls the transmission of light to add a character to a specified area on the document, brings the character part to a black level, and prints a limited area around it. Performs character printing processing using the white level as the white level.

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 10, 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 toner particles are absorbed according to the potential distribution of the electrostatic latent image. A black and white 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. These paper feed cassettes are equipped with detection marks that indicate the size of the recording sheets they accommodate, and the size is detected when they are installed. 13 and 15 are paper feeding rollers, 14°, 16 and 18 are buoy rollers, and 17 is a registration roller. The fed recording sheet is stopped once with its leading edge in contact with the registration rollers 17, and is moved onto the photoreceptor by the registration rollers 17 at a predetermined timing synchronized with the rotation of the photoreceptor drum 9 and the scanning of the original image. It is fed so as to overlap the visible image (toner image) on the surface of the drum 9.

When the recording sheet passes through the position of the transfer charger 19.

The visible image on the photosensitive drum 9 is transferred to a recording sheet.

When the recording sheet passes through the position of the separate charger 2o,
The recording sheet is separated from the photoreceptor drum 9 and guided to a 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 reversing 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 taken is determined by the state of the conveyance direction controller 1131 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. Via feed rollers 36 and 18, registration rollers 17. The 0 reversal path where the paper is fed to the position is used for double-sided copying and for aligning the sides of the recording sheets to be ejected.

FIG. 2c shows the first carriage 99 section on which the illuminating lamp 3 is mounted in some detail. Two scale holder arms SA are fixed to the first carriage 99 in a direction perpendicular to the plane of the paper. 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 at the front and rear (in a direction perpendicular to the plane of the paper). 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. When the solenoid 103 is energized, it 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, thereby causing the scale 1
00 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, when one position data is input, the solenoid 103 is energized, the illumination lamp 3 is turned on at 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 is A3 with a length of 30011Il from the image origin.
(equivalent to the length of the short side of the size), insert scale lines at 2m intervals, and
0.10, 20 for each scale. ...A numerical value of 290 is attached. This first scale is used to erase the image within the specified area, so the area on the first scale side of the scale reference line is colored "blue" so that it can be clearly distinguished. It is stamped with.

The second scale 1oob has the same unit division as the first scale 100a, but the origin value is 300, and every 5 scales 31
0,320. ...A numerical value of 600 is attached.

This first scale is used to erase images outside the specified area (extract images within the specified area), so in order to clearly distinguish this, the area on the second scale side of the scale reference line is marked in red. '' and the words ``Gai-kan'' are printed on it.

The eraser 24, a cross-section of the eraser 24 is shown in FIG. 4a.
is a long rod-shaped cathode ray tube 24 extending in a direction perpendicular to the plane of the paper.
0. A reflecting mirror 242 with a parabolic cross section, and a filter 2 that matches the spectral distribution of the projected light to the characteristic spectrum of the photoreceptor.
43. It is composed of a liquid crystal plate (liquid crystal shutter) 244, a liquid crystal driver 245, and the like.

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 has two rows of light-transmitting segment electrodes (light-transmitting, non-light-transmitting control electrodes) at 4 [dot/m] in the direction along the axis of the photoreceptor drum 9, that is, in the width direction of the photoreceptor.
This is for printing single characters arranged in rows A and B, and for controlling erase areas, and segment electrodes and lead electrodes integrally continuous with the segment electrodes are printed on a transparent substrate. Group electrodes each having a length of several segments are similarly arranged in the width direction of the photoreceptor on a light-transmitting substrate that 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 scale 100a and the second scale toob of the scale 100 are 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. Large-diameter frustoconical holes 100CI and 100C2 are drilled on the back side. When solenoid 103 is energized.

The Y-axis scale 100 is lowered onto the arm SA, and at this time the protrusion 5Aa2 enters the hole 100c2, and the Y-axis scale 100 is positioned in the Y direction. As a result, the Y-axis scale accurately matches the erase area of the eraser 24.

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. Read only memory (ROM) 83° read/write memory (RAM)
84. Non-volatile read/write memory (NRAM)85. It is composed 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 the battery 90 via a diode, and the battery 90 is floating. The input/output port 87 is connected to the eraser control unit 241 and the image exposure shutter control unit 82, as well as a separation jam sensor, double feed detection sensor, P sensor, toner sensor, home position sensor of the carriage 99, and others. A sensor and a switch unit, a jam indicator, an operation board 42, and the like are connected.

The input/output port 88 includes a driver for driving various motors, a lamp regulator for controlling the illumination 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, and the like. A solenoid driver, etc. is connected.

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,” key 4
4″, set number display 46, copy number display 471
Interrupt key 489 Interrupt indicator 49. Paper cassette selection key 50. Sheet size indicators 51, 53. Paper feed selection display 52° 54, magnification adjustment keys 55U, 55D, magnification display 56, copy mode B (text character print mode)
Selection key 57S, mode B display 57L.

Copy mode A (combined copy mode) selection key 58S, mode A display 58L9 Fractional page (page . . . of the total number of pages) print designation key 59S2 Fractional page print display 59
L2 page print designation key 60S1 page print indicator 60
L1 page print position specification key 61S2 page print position indicator 61L1 to 61La* page print position specification key 62
S1 page print position indicator 62L1.62L2. Scale print magnification designation key 63S2 Magnification designation display 63L
, scale print designation key 64S, scale print designation display 64L, fixed pattern print information selection key 65S, information selection display 65L, signature print designation key 66S, signature print designation display 66L2 double-sided copy designation key 67S2 double-sided copy designation Display 67L, movement designation key 70 + x e 70 X # 70 + y
and 70-y, movement amount indicator 71x*71Yt, toner end indicator 72. Jam indicator 73. A paper end indicator 74, a scan designation key 105S for designating scale scanning for area reading, and a scan designation display 105L are provided.

When mode A (composite copy mode: multiple transfer) is specified with the copy mode A selection key 58S, the recording sheet that has been fixed in the first copy is conveyed to the return path and stored in the intermediate tray 34, and then transferred to the second copy. In the second copying, the intermediate tray 34 is automatically selected as the paper feeding tray, and recording is performed again over the previous recording sheet. In this way, mode A has two stages, the first stage is canceled when the first copy is completed, and the second stage is canceled when the second copy is completed (no specification). When this key 58S is operated when copying is completed (first stage canceled: second stage), the first stage is set again.

The recording sheet that has been fixed is conveyed to the return path again and stored in the intermediate tray 34. Therefore, by operating the key 58S in the second stage state, any number of images can be superimposed. Therefore, mode A indicator 58
L is "white lamp on".

The three states of "red lamp on" and "both lights off" display the three states of mode A: first stage, second stage, and no designation. Note that when mode A is not designated, the first stage and the undesignated state are repeated each time the copy mode A selection key 588 is operated, so mode A can be canceled at any time.

Image editing processing (delete an area of the 1M draft in mode A,
If you need a composite copy in which an area of the second original is inserted, press the copy mode A selection key 58S to specify mode A, and then press the scan designation key 105 to specify the area. Become. In this input mode, the details will be described later, but the operator drives the scale 100 in the exposure scanning direction and the return direction using the movement designation keys 70+x and 70-x, stops at the X position to be designated, and attempts to designate it. Scale the Y position to 10
Read on the first scale of 0 (for middle erase: image deletion) or the second scale (for outer erase: image extraction), input the read value using the numeric keypad 44, and after manually pressing the ``,'' key 44'. Press this operation for the two diagonal points (vertices) of the rectangular 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 you need the character print mode (composite copying in which one area of the original is erased in mode B and a fixed pattern such as text or marks is inserted there), press the copy mode B selection key 57S to select mode B. Specify.

In this case as well, area designation is performed in the same manner as in the image editing process described above.

In this character print mode, printing a single character and copying the original are performed in the same process, so the details are explained later, but in order to prevent the electrostatic latent image of the character formed on the photoreceptor from being erased, The print area of the single character character of the image light is shielded from light. For this reason, for example, when adding a pattern to a photographic image, a picture image, etc., a fixed pattern such as a text character or the like is superimposed on the original image without erasing the background.
R) In such a case, mode A and mode B may be used together. That is, a copy of the original image is made in mode A, this copy is re-fed, and a fixed pattern is printed in mode B. Or, if you want to print first, mode A and mode B
If you specify this at the same time and perform normal copying (however, set the second stage of mode A, as described below) when refeeding paper, the result will be %N.

In the normal copy mode in which mode A and mode B are not designated, these movement designation keys 70+x.

70 x e 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. While pressing this key 608, press the numeric keypad 4.
4, the page printing is performed using the number inputted using the numeric keypad 44 as the starting page, which page is updated when the original is replaced.

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 inputted using the numeric keypad 44 becomes the denominator of the fraction, and the number of document changes becomes the numerator of the fraction.

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

The page print orientation designation key 62S is used to designate the orientation of page number printing, and can select one of vertical orientation and horizontal orientation. Note that the printing direction of this page number is vertical in the Y-axis direction.

A scale print designation key 648 is used to designate printing of scales on recording paper. When scale printing is designated with this key 64S and a scale print magnification designation key 63S, which will be described next, is not input, the scale of the scale to be printed is printed at the set copying magnification.

The scale print magnification designation key 63S is a key for inputting the magnification of the scale to be printed, and if a magnification is input using the numeric keypad 44 while holding down this key, the manual value of the numeric keypad 44 is set as the scale magnification.

The signature print designation key 66S is used to designate the printing of a signature mark at the center of the recording paper. If signature printing is specified, "+" is printed in the upper and lower margins of the center of the recording paper in the feeding direction.

The character information selection key 65S is used to select one of a plurality of sentences stored in advance 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 eraser control unit 241 includes a microprocessor 241A that controls the entire control unit, a RAM 241D for temporary storage, and fixed pattern information such as characters to be written and control information. Memorized RO
M241E, input/output interface 241G, 241
H.

241I, a data bus that connects these, and a decoder 241G that generates liquid crystal segment electrode activation signals 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 4 [
It has two rows (row A and row B) of segment electrode arrays in which light-transmitting segment electrodes are arranged to control light transmission over the maximum copy width at a pitch of dat/mml. When a non-light-transmitting energizing voltage is applied to each segment electrode, the liquid crystal in that part becomes non-transparent, and from the cathode ray tube 241 to the photoreceptor drum 9.
Block out the light. These are energized in two control modes by information from the microprocessor 80 of the main control (FIG. 5).

First, use the normal erase mode (Erase 1 of the specified area for erasing outside the document area and erasing images within the document area.
In image extraction (erase outside the specified area), one selected segment electrode is energized in both A and B rows at the same time, as shown in FIG. 4d. The energizing time 2T is the time it takes for the surface of the photoreceptor drum to move by one dot (1/4 [■]). In the case of a mode that prints 0-character character information (mode B 2-page print, etc.), the time shown in Fig. 4C is As shown, the B row located downstream of the A row is activated one hour later than the activation timing of the A row, thereby making the dots smaller and increasing the resolution of characters, etc.

One letter (including numbers for summer) has a vertical m dot and a horizontal m dot.
The segment electrode energizing voltages shown in FIGS. 40 and 4d are generated in synchronization with the drum synchronization pulse, which appears at one pulse per movement (T) of one dot on the surface of the photoreceptor. When printing zero characters, the characters (latent image) written on the photoreceptor by row A are transferred to B by the rotation of photoreceptor drum 9.
Since it moves to the column position, the B column write information is assumed to be the A column write information delayed by T. In the case of erase mode, the write information in column A and the write information in column B are assumed to be the same,
Every second synchronization pulse is updated to the next line.

Since an electrostatic latent image of a character can be formed on the photosensitive drum 9 by the functions of the eraser 24 and the liquid crystal shutter 244, it is possible to print text or the like that is not on the original on the recording sheet.

By the way, if the electrostatic latent image of the character is irradiated with the electrostatic latent image by the image light of the document, the latent image may be neutralized. For this reason, an image exposure shutter 200 is provided. That is, the one-image exposure shutter 200 blocks the reflected light of the document projected onto a rectangular area surrounding the latent image of the character.

This image exposure shutter 200 has almost the same configuration as the liquid crystal shutter 244 of the eraser 24, but its purpose is to block light reflected from the original image in the rectangular area.

Since there is no energization control like in the character print mode, the configuration and control operation are simplified accordingly.

In other words, the one-image exposure shutter 200 is 1 [dot/m
It is composed of translucent segment electrodes with an Al density, and its control unit 82 does not hold character information or text information.

The image exposure shutter 200 is connected to a liquid crystal driver 77 shown in FIG.
2, the microprocessor 80 of the main control section (Fig. 5)
controlled based on more data. The electrical operation is similar to that of the liquid crystal shutter 244, but the activation timing is delayed by the time required for the character latent image formation portion of the photoreceptor to move to the exposure position.

The image exposure shutter 200 is installed in the optical path of the original scanning light, and selectively energizes the light-transmitting segment electrodes based on information from the main control unit (FIG. 5) to selectively block the reflected light from the original. For example, the diagonal coordinates (S 1.T
2) - (S2.T5) In the area of the recording sheet determined by diagonal seat 1111 (PL, T3) - (P2.T5)
When character printing is set using the operation unit in the area determined by By applying (PI, T3)
Image exposure of the area determined by the coordinates -(P2.T5) is blocked. Note that the required text etc. will be printed in this area by the eraser 24, that is,
The image exposure shutter 200 is in print mode (page print).

The bias is controlled by scale print, character print).

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

See 6th aWi. Control unit 82 is equipped with two programmable interval timers 93 and 94. The timers 93 and 94 used here are 8253 (or 8254) manufactured by Intel Corporation. Simply put, this timer has three built-in 16-bit counters, and operates in one of six modes depending on the content of data set in an internal control register. Each mode is
It is as follows.

Mode 0: After setting the terminal count mode, the counter output state is at a low level. 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 one-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 for one clock interval becomes low level L only once during terminal counting.

The count input terminals CLKO, C: LK1 and CLK2 of each of the three counters (0°1.2) of the programmable interval timer (hereinafter abbreviated as timer) 93 and 94 are as follows:
Output terminals of oscillators that generate clock pulses with a predetermined period are commonly connected.

Counter 0 of timer 93. each gate terminal GATEO of counter 1 and counter 0 of timer 94;

GATE1 and GATEO are counter 2 of timer 94.
are commonly connected to the output terminal 0UT2 of the two. timer 9
The gate terminal GATE2 of the counter 2 of the timer 93 is connected to the output terminal 0UTI of the counter 1 of the timer 93.
The gate terminal GATE 1 of the counter 1 of the timer 94 is connected to the output terminal 0UTO of the counter O of the timer 94.
The gate terminal GATE2 of counter 2 is connected to the power supply line (+
Vec). The output terminal of the oscillator is connected to the clock output terminal (CLOCK) via the inverter INVI.
is connected to the output terminal 0UT of counter 0 of timer 93.
O is connected to the latch output terminal (LA
TCH). The output terminal 0UT2 of the counter 2 of the timer 93 and the output terminal ○UTI of the counter 1 of the timer 94 are connected to each input terminal of the exclusive OR gate EOR1, and the output terminal of the gate EORI is
The signal output terminal (S-OUT
)It is connected to the.

Each output terminal (CLOCK) of the control unit 82.

(LATCH) and (S-OUT) are respective input terminals (CLOCK) of the eraser driver 77.

(LATCH) and (S-IN).

The eraser driver 77 includes 38 integrated circuits (TD62801P manufactured by Toshiba) IC1 to IC38 having the same configuration.

The configuration of the ICI is shown in Figure 6b. The ICI consists of an 8-bit shift register, an 8-bit latch, a gate, and a driver, and an output enable control terminal ENAB L.
E, latch control terminal LATCH.

Signal input terminal 5-IN, clock input terminal CLOCK,
Reset control terminal RESET, signal output terminal 5-OUT
and an 8-bit driver output terminal. For each driver output terminal.

The light-transmitting segment electrodes of the image exposure shutter 200 are connected to each other via resistors. Other IC2~IC
38 has exactly the same configuration, but 4 of IC38
Two driver output terminals are not used. In this,
An overlined symbol indicates that the signal line is L active.

Latch control terminal LATC of each integrated circuit IC1 to IC38
H are commonly connected to the input terminal (LATCH) of the shutter driver 77, and the clock input terminals of the respective integrated circuits are commonly connected to the input terminal (CLOCK) of the shutter driver 77. The input terminal (S-IN) of the liquid crystal driver 77 is connected to the signal input terminal 5-IN of the integrated circuit ICI, and each integrated circuit IC2, IC3, IC
4, --..., signal input terminals 5-IN of IC37 and IC38 are each integrated circuit ICI in the previous stage.

IC2, IC3,'..., are connected to the signal output terminals 5-OUT of IC36 and IC37.

In other words, the integrated circuits ICI to IC38 are connected in series with each other, thereby forming a shift register with the number of bits equal to the dot density times the maximum width of copying. In this example, the shift register is 300 bits. There is.

Therefore, if the light shielding information is input to the signal line 5-IN as serial data with the number of bits equal to the dot density x maximum copying width, and a latch pulse is applied when the data is completed, the data will be serial-parallel converted and the data will reach a high level. A bit holding a high level (which is inverted at the output of the driver) energizes the segment electrode, and a bit holding a low level L deactivates the segment electrode, so that any area of maximum copy width can be can be selectively non-exposed.

The copyable area on the surface of the photoreceptor drum 9 during one copy cycle is expanded and shown in FIG. 7a. Since the photoreceptor drum 9 rotates at a constant speed, when viewed from a fixed position, The position of the front surface in the scanning direction (indicated as the original scanning direction in the figure: X) is.

The vertical direction in Figure 4, which can be expressed in terms of time, is the width direction, that is, the Y direction.

For example, in a device that can make A3 size copies.

When copying a B4 size original image, the original image copy area is smaller than the copyable area as shown in FIG. 7a.

In this case, the leading edge erase (full-width erase) is performed in the area from the leading edge of the copyable area to the leading edge of the original image (times T1 to T2), and the area where the original image exists (times T2 to T5) is erased.
) performs site erase (erasing areas other than the width of the original) and erases the area from the rear edge of the original image to the rear edge of the copyable area (
At time T5 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, in FIG. 7a.

The case of erasing an area is shown, and the area P1 to P2 in the width direction (Y direction) is erased at the scanning direction (X direction) position specified by T3 to T4 for one hour. Since the eraser 24 is arranged so as to cover the entire area of the O-M position along the width direction axis, by controlling which area of the eraser 24 the segment electrodes are energized and deenergized. , the erase area in the width direction is determined. In this case, a signal instructing site erase and a signal instructing designated area erasing are combined. Conversely, when extracting a specified area,
There is only a signal instructing erasing outside the specified area, and there is no signal instructing site erase.

In the case of character printing, page printing, or scale printing, the image exposure shutter 200 is operated 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 erased area, but in the five-image exposure shutter 200, the segment electrodes are controlled to be non-transparent in the non-exposed area. Since the image exposure shutter 200 is also provided with information indicating which area segment electrodes are to be energized, the exposure blocking area in the width direction can also be expressed in terms of time.Control unit 82 shown in FIG. 6a is controlled. By this, the liquid crystal driver 77
A signal can be generated to energize the.

In this case, the signal for energizing the liquid crystal driver 77 is
If there is a single designated area, the signal will only be used to block the image exposure of the designated area, similar to the eraser image extraction described above, but if there are multiple designated areas and/or other printing is performed. When multiple modes are used, multiple signals will be combined.For example, if text is printed in a specified area and a scale is printed on the periphery of the recording sheet, the image exposure of the area where the scale is printed is A signal for blocking image exposure in a designated area and a signal for blocking image exposure in a designated area are combined. This signal will be approximately equal to the eraser control signal at time T3 shown in Figure 7a. Therefore, although the values are different, since the signal patterns are the same, the operation of each part of the control unit 82 for cutting off image exposure will be explained using FIG. 7a.

The signal timing shown in FIG. 6c (in this case, Te3
and Te3 refer to timers 93 and 94, respectively).

In order to operate this control unit 82, it is first necessary to set the mode of each timer 93,94. To give an example of mode setting, at timing T3, the operation modes of counters 0, 1, and 2 of the timer 93 are set to 5, 1, and 1, respectively;
M, 5l- for each count register 1 and 2, respectively.
1 and S2 (see FIG. 7a); set each operating mode of counters 0, 1, and 2 of timer 94 to 1.
PI-1 and P2 are set to 1 and 0, respectively, and the count registers of counters 0.1 and 2 of the timer 94 are set to PI-1 and P2.
and 2 (see Figure 7a). However, please note that in this case, the difference between each area is set.

When the mode setting is completed, the output signal of the counter 2 of the timer 94 (Te3-0υT2) is set to low L/high L, and becomes high level H after counting two pulses. three counters to which this signal is applied to their gate terminals,
In other words, 0 and 1 of the timer 93 and 0 of the timer 94 are
The rising edge of that signal triggers the counting operation.

Here, since counter 0 of timer 93 is set to mode 5, the output signal (Te3-0UTO) remains at high level H, but counter 1 of timer 93 and timer 9
Since counter 0 of No. 4 is set to mode 1, at the falling edge of the next pulse after the gate terminal becomes high level H,
Their output signals (Te3-OUTI and Te3-OU
TO) is set to a low level L.

Counter 1 of timer 93 has 81-
Since 1 is set, 51-
At the first pulse, the output signal (Te3-OUTI) is inverted to a high level H. The counter 2 of the timer 93 has that signal applied to its gate terminal.

Since the mode is set to 1, at the falling edge of the next pulse (S1th pulse) after which the signal became high level H, the output signal (Te3-0UT2) i! Low L／／
(Set to L.

Counter 0 of timer 94 has P in its count register.
Since l-1 is set, at Pl-1st pulse,
Its output signal (Te3-OUTO) l;]: Set to high level H. Since the counter 1 of the timer 94 to which the signal is applied to the gate terminal is set to mode 1, the next pulse (P
At the falling edge of the i-th pulse), the output signal (Te3-0U
TI) is set to a low level L.

When the P second pulse appears, the output signal of the counter 1 of the timer 94 (Te3-0υTl) is inverted to high level H, and when the S second pulse appears, the output signal of the counter 2 of the timer 93 (Te3-0UT2) is inverted to high level H. When the Mth pulse appears, since the counter O of the timer 93 is set to mode 5, an L level pulse of one clock width appears in its output signal (Te3-OUTO) only once.

Therefore, two output signals (T93-0LIT2 and Te
5-OU, which is the inverted exclusive OR of 3-OUTI)
A high level H appears at T during periods corresponding to the pulse numbers of 0 to Sl, Pi to P2, and S2 to M.

Since this signal 5-OUT is read into the shift register of the liquid crystal driver 77 in synchronization with the clock pulse, the number of these pulses corresponds to the position of the segment electrode of the image exposure shutter 200 connected to the driver 77. . Furthermore, the high level H of the signal 5-OUT means that the segment electrode is energized, that is, the exposure of that part is cut off.
The ranges from ~P2 and ~82~M are subject to image exposure blocking.

When blocking image exposure only in a designated area, it is sufficient to activate the image exposure shutter whose timing in the X direction corresponds to T3 to T4 and in the Y direction to P1 to P2, so the counter 2 output of the timer 93 is If prohibited, it is possible to obtain a 5-OUT signal that is at H level only between P1 and P2.

In the case of the eraser 24, if you want to erase the designated erase area shown in Figure 7a, you just need to obtain a signal exactly the same as the OUT signal in Figure 60.If you want to extract the area , the counter 2 output of the timer 93 may be prohibited. However, in this case, the difference is that the liquid crystal shutter is made to transmit light by the H level signal.

As shown in FIG. 8, a predetermined area 92 of a document 91 placed on the contact glass 1 is
When specifying by specifying i, x2 and two pieces of Y coordinate information Ylyy2, area extraction/erasure (eraser 2
4), and the logical product of the two coordinate systems (A
Considering the combination of ND) and disjunction (OR), FIG. 9a.

Figures 9b, 10a, 10b, 11a.

There are eight types of area designation patterns shown in FIG. 11b, FIG. 12a, and FIG. 12b. That is, 5. Figures 9a and 9bliJ respectively show patterns obtained by the logical product and logical sum of erasure of the area x1 to x2 and the area erasure of y1 to y2. , respectively, erase the area from XI to x2 and y1
Figures 11a and 11 show patterns obtained by logical product and logical sum of erasure with region extraction of ~y2.
Figure b shows area extraction of xl”x2 and yt-y2, respectively.
FIG. 12all and FIG. 12b show the patterns obtained by the logical product and logical sum for erasure with area erasure of x 1 to x 2 and y1 to y2, respectively.
It shows a pattern obtained by logical product and logical sum regarding erasure with area extraction of . In addition, if we do not take into account the combinations of logical products and logical sums of the two coordinate systems, there are 512 patterns in total, but the probability that a special pattern will be used is small, and there may be different types of patterns. If there are too many, there is a possibility that the operator will make a mistake in operation.
In this embodiment, only two patterns, the pattern shown in FIG. 9a and the pattern shown in FIG. Extract the pattern (delete outside the specified area:
In the case of external cancellation), the 12th bvA pattern 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 one image moves in the positive direction (to the right in the figure) with respect to the document scanning direction.

Furthermore, if the sheet supply timing of the registration rollers 17 is advanced, the recording sheet will be shifted to a position ahead of the normal position of the image on the photoconductor, and this will cause the recording sheet to shift to a position ahead of the normal position of the image on the photoconductor, resulting in the same effect as when delaying the document scanning start timing. If the movement is performed and the sheet supply timing of the registration roller 17 is delayed, the same as the case where the JFX document scanning start timing is advanced,
The image is moved. In this example, when the image is moved by a relatively small distance, only the original scanning start timing is shifted, and when the moving distance is large, both the original scanning start timing and the sheet feeding timing of the registration roller 17 are shifted. I have to.

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 solid line position, the light emitted from each part A, B, and C of the original is.

The lenses reach positions A, B, and C on the photoreceptor, but when the lens moves to the position indicated by the two-dot chain line, each part of the document A, B
The light emitted from C and C passes through optical paths indicated by two-dot chain lines and reaches 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, change the positional relationship between the lens and mirror, set the magnification of the entire optical scanning system to HML, and then calculate the reciprocal of the magnification and the scanning speed of the optical scanning system at the same magnification. 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 Figure 13a, Figure 13b, Figure 13c, Figure 13d, Figure 13e, Figure 13f, Figure 13g, and Figure 13h, two characters of microcomputer (C: PU) 80 are shown. This figure shows a general outline of the operations mainly for setting operations for printing and image compositing. The operation will be explained with reference to each episode. 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 it is operational or not (3). If it is not ready, check for abnormalities. 4) 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 (10a),
If there is no start instruction, the state of the numeric keypad 44 is checked first (21a).

If there is no input operation on the numeric keypad 44, the process proceeds to FIG. 13b and checks the switch 58S (mode A) on flag and the switch 57S (mode B) on flag (24). Although this flag is cleared in the initial state, If such a key-on flag is present, editing (mode A) or character printing (mode B) is instructed, so the process proceeds to step (25) and the scan key-on flag is checked. This flag is also cleared in the initial state, but if the scan key-on flag is present, a JI collection area designation instruction is given, so the process proceeds to the designated area reading control shown in FIG. 13c.

However, when there is no key-on flag in both 57S and 58S, movement designation keys 70+x and 70-x are used.

Check the operations of 70+y and 7o-y (90, 92, 94, and 96 in Figure 13b), and if none of the movement designation keys is on, check the status of other keys (described later), and If not on, the operation board 42
Return to status reading (9) and repeat this process. In other words, when no key is operated, (9) = (
10) −(21a) −(24) −(90) −(
92) -(94) -(96)-...-(15
3-■)-(9)-..., the same process is repeated in a loop, resulting in an input waiting loop waiting for key human power.

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 dTj
After waiting for a period of time (99), the process returns to step (9). When movement key 70+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 0-y 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).

That is, if the movement designation key is operated in this case (edit and/or print non-instruction letter S), the parameter 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.

Although not shown in one drawing, 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, and the image is moved in the Y direction, that is, the lens 7 is moved in the Y direction at the same time as the parameters S1 and S2 are updated. The amount of movement is displayed numerically on movement amount indicators 71x and 71y on the operation board 42.

* When the mode A designation key 58S is pressed, it is detected in step (116) in FIG. 13f. As mentioned above, mode A is specified in two stages, and the stage is detected and changes depending on whether the switch 585 is turned on or not, and whether there is recording paper in the intermediate tray 34. In other words, when the switch 585 has no on flag and is 117a), mode A has not been specified in the previous process, so the key 58S is
The switch 583 on flag is set by the input, and the white lamp indicating the first stage is lit on the mode A display 58L (119); the switch 588 on flag is present (117)
In the case of a), mode A was specified in the previous process, so check whether there is a recording sheet on the intermediate tray 34 (
117b), with recording sheet is the second stage, and mode A
Turn off the red lamp that indicates the second stage that is lit on the display 58L, and turn on the white lamp that indicates the first stage. (117a, 117
b) , the instruction to cancel mode A has been input,
The white lamp indicating the first stage that is lit on the mode A display 58L is turned off (11g).

Note that in the initial state, the switch 588 on flag is reset and there is no recording sheet in the intermediate tray.

When the switch 588 on flag is set, the process proceeds to step (25) after step (24), where the scan key 105 on flag is checked. scan key 10
The 5-on flag is set by operating the scan designation key 105S while the switch 588 on-flag is set (switch 573 with the on-flag will be described next); however, this key is an alternate switch, and the scan key 105 can be set manually. The set/reset state of the on flag is reversed (not shown), and at this time, the erase set flag, which will be described later, is cleared.

** When the mode B designation key 57S is pressed.

Detected in step (120) of FIG. 13f, the set/reset state of the switch 575 on flag is reversed (
121 to 123), that is, mode B designation key 57
S is an alternate switch, and each time the switch 578 is pressed, the on flag of the switch 578 is repeatedly set/reset.

When the switch 57S on flag is set, the process proceeds to step (25) after step (24), where the scan key 105 on flag is checked. In this case as well, when the scan designation key 105S is operated while the switch 573 on flag is set, the set/reset state of the scan key 105 on flag is reversed.
An erase set flag, which will be described later, is cleared (not shown).

*** Switch 588 on flag or switch 58
When there is an 8-on flag and the scan key-on flag is set, the movement designation keys 70+x and 70-x are activated through steps (24) to (25) in FIG. 13b and steps (26) and (36) in FIG. 13c. Manpower is checked. If the movement designation key 70 + x is turned on here, step (
Perform scale scanning drive control of 27) to (32),
When the movement designation key 70-x is turned on, step (37)
- (40) 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).
If 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) LMP, check whether the content is greater than or equal to 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 time dt2 is waited until the scale 100 is placed on the arm SA (30).

The carriage 99 scanning motor 106 (Fig. 5) is set to low-speed forward rotation, and the pulses generated by the synchronous pulse generator 107 (Fig. 5), which generates electric pulses in conjunction with the movement of the carriage 99, are counted up. Start (31). Next, the carriage scan flag is set (32) after the scanning drive of the carriage 99 has been started (with the carriage scan flag).

While the movement designation key 70+λ is on, step (26)-
(27) -(28-■)... and so on. When the count value reaches the limit value LMP, the process proceeds to step (34) to stop the motor 106 and clear the carriage scanning flag (35). When the movement designation key 70+x changes from on to off, steps (26) to (33) ) −(34)
- (35) and similarly stop the motor 106.

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 to low-speed reverse bias to start the down count (39), and set the carriage return flag (40). After starting the return drive of the carriage 99 in this way (with the carriage return flag), press the movement designation key. While 70-x is on, steps (36)-(37)-(38-■)...
・The count value is the value of the home position HP (0
), proceed to step (42), stop 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 switch 58S or 57S to set mode A (edit mode) or mode B (character print mode),
When the scan key 105S is pressed to set the scale drive mode and the primary movement designation key 70+K is pressed, the scale 100 is supported by the carriage 99, the illumination light is turned on at low brightness, and the graduations of the scale 100 are projected onto the document on the contact glass. and starts moving in the exposure scanning direction. When the movement designation key 70+x is released (off), the scale stops there.

When the movement designation key 70-x is pressed, the scale 100 moves in the return direction, and the movement designation key 70-x is released (off).
And the scale stops there. In any case.

Once the movement designation key 70 + You can see the scale projection image.

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

■, Key 58S or 575 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.
Enter the Y coordinate value of the corner using the numeric keypad 44, using the scale value of a, or when erasing outside the specified area, using the scale value of the second scale 100b, and then turn on the "," key 44''.Mode B The result is the same 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.

*Ne** Next, the operator's 4. Explanation of the area data input process in response to the operation: 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 value register. Next, when you turn on the "," key 44',
It is detected in step (44) of FIG. 13c and the step (
Proceed to step 45).Here, proceed to step 4 above. Since i=0 until the operation of step (46), the contents of the numerical register are stored in the Yf register and the scale scan count value (scanning position detection value) is stored in the Xf register, and the process proceeds to step (47).
), set i=1 indicating the end of the first diagonal coordinate distance, wait for the elapse of time dTl in step (48), and return to operation board reading (9). When the operator moves the scale 100 to a desired position, inputs the scale value using the numeric keypad, and presses the "," key 44',
The numeric keypad manual force value is set 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 in , this time, t
= 1, so step (45) to step (49
) and transfer the contents of the numeric register to the Yfi register,
Set the scale position in the XQ register, and in the second operation set the value in the YQ and .

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

*Ne** Umbrella The operator is in 7 above. When the rescan designation key 105S is pressed, it is read in step (9) and the scan key 105 on flag is cleared, and in response, control proceeds from step (25) to step (58) in FIG. 13b. , In scale scanning end processing steps (58) - (59) - (60) - (61), the scale 100 is returned to the home position HP, the solenoid 103 is deenergized, and the lamp 3 is extinguished. Then, set the erase area shown in the 13th d@, or
e Set the print area shown in the figure.

First, the setting of the erase area will be explained with reference to FIG. 13d. If the switch 588 on flag is present (if mode A is set: 62), please refer to the presence or absence of the erase set flag (flag indicating that the erase area setting steps 71 to 81b: have been executed), or not (63). (
(unset) and check whether the read end flag is present (
64). If there is no read end flag, the area coordinate data has not yet been input, and the process proceeds to other key-in processes shown in FIG. 13f and subsequent figures. If there is a read end flag, the area coordinate data has already been input, so step (71)
Then, the contents (value) of register Yf are compared with 300. Y
If the content Yf of the f 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 "Cut off" is instructed, and steps (72) to (77) are performed. After area determination.

In steps (78a) to (81a), the image within the specified area is erased (erase area setting). In this case, in step (72), the contents of the YQ register YQ are
is compared with 300 to check whether the input value is based on the first scale 100a. If Ya is less than 300, 2
Since all of the point inputs are based on the first scale 100a, the calculated values AYf and AYQ are assumed to be Yf and YQ, respectively.

If YQ is 300 or more, the coordinates input later will be
The values were input based on the scale 100b (sleepover), but in this case, priority was given to what was input to the light, and the calculated values AYf and AYQ were calculated as Yf and Ya-3, respectively.
Set to 00. In other words, the value input later is set to the first scale 1.
Update to a value based on 00a (steps 72 to 74),
Next, in steps (75) to (76), the specified area range corresponding to the eraser 24 is determined and one image erasing area is set (7
8a) to (81a).

In other words, erase is performed within the rectangular area specified by the X coordinate position within the range indicated by the contents of register Xf and register XI2, and the Y coordinate position within the range indicated by AYf and AYfi. Set the data for controlling the liquid crystal shutter 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 graduation 100b of the scale 100, so it is assumed that "sleepover" is instructed, and steps (83) to (88) are performed. After area determination, step (7)
8b) to (81b), the image outside the specified area is erased (erase area setting). In this step (8
In 3), the content YΩ of the YQ register is also compared with 300 to see if it is the input value based on the second scale 100b.

If Yfl is 300 or more, both of the two input points are
Since it is based on the scale 100b, the calculated value AYf
and AYQ as Yf-300 and Yn-30 respectively.
Set to 0. If Ya is less than 300, the coordinates input later were input based on the first scale 100a (nakazuke), but in this case, the coordinates input to the light are given priority and the calculation is performed. The values AYf and AY12 are respectively Yf-3
00 and YQ (steps 72 to 74) 0 Next, in steps (75) to (76), the specified area range corresponding to the eraser 24 is determined, and the image erasing area is set (78b)
~(81 de).

That is, the contents of register Xf, the position on the X coordinate within the range indicated by the contents of register XQ, AYf, and AY
Data for controlling the liquid crystal shutter is set so that erasing is performed outside the rectangular area specified by the position on the Y coordinate within the range indicated by j2.

Once the image erasing area is set in this way, the process returns to step (9) for reading the operation board through other key manual operations shown in FIG. 13f and subsequent steps.

In step 62 of FIG. 13d, if the switch 585 on flag is not present (not in mode A), the process advances to step 66 to clear the erase set flag (this flag is set using the scan key as described above) to enable the next area setting. 105
(It is also cleared by the operation of S), or if there is an erase set flag in step (63) (setting of the erase area in mode A has been completed), the switch 57
Check the S-on flag (67). If this flag is present, mode B has been set, and the process proceeds to the print area setting shown in FIG. 13e. This print area setting is the same as the erase area setting described above.However, in setting the print area, characters, etc. are written in the specified area, so coordinate input based on the numerical value of the first division of the scale 100 is not possible. An input based on the value on the second scale is written directly into the register and converted into a value obtained by automatically subtracting 300 from that value, that is, a value based on the first scale.

Setting the print area in this way allows you to print copies (
In mode B), the liquid crystal shutter 244 and the eraser 2
Write character information in the print area specified in step 4 and use the image exposure shutter 2 to prevent the latent image such as a single character from disappearing.
00 blocks the image light in that area (foreground images such as characters are erased).

When the 1-page print designation key 60S is operated in input reading (9) on the operation board, step (12) in FIG.
4) is detected and the switch 608 on flag is set/
The reset state is reversed.

At this time, if the switch 608 on flag has been reset, the switch 608 on flag is set, the 9 display 60L is lit, and the 1 display 60L is lit; the switch 598 on flag, which will be explained next, is cleared and the display 8159L is lit.
are turned off (125 and 126). In this case, key 6
When a numerical value is input from the numeric keypad 44 while pressing 0S (21a and 21h in Fig. 13a), the input value is read into the page start register in the subroutine of step (21+) in Fig. 13a, and the number of original changes is calculated. The page counter is reset. However, the value of the page start register is 1 in the initial state.

Further, in a state where the switch 603 on flag is set, the switch 608 on flag is reset and the second display 60L is turned off (125 and 127).

The subroutine of step (21i) in FIG. 13a is as follows:
If the numeric keypad 44 is operated without the switch 598 on flag, the process returns to step (22).

When the fractional page print designation key 59S is operated in input reading (9) on the operation board, step (
12g), and the set/reset state of switch 598 on flag is reversed. At this time, switch 5
If the 98 on flag is reset, switch 59
The 8 ON flag is turned on on the CERA 852 display 59L1; the aforementioned switch 608 ON flag is cleared and the display 60L is turned off (129 and 130). In this case, key 59
If you enter a value from the numeric keypad 44 while pressing S, (
In the subroutines 21a and 21f) of FIG. 13a and step (21g) of FIG. 13a, the input value is read into the fractional page register, and the page counter for counting the number of document changes is reset.

Further, when the switch 593 on flag is set, the switch 59S on flag is reset and the 1 display 60L is turned off (129 and 131).

The subroutine of step (21f) in FIG. 13a is as follows:
If the numeric keypad 44 is operated without the on flag of the switch 593, the process returns to step (22).

In this way, single page printing and fractional page printing are performed alternatively, so in step (126) and step (130) in FIG. 13F, when the switch 608 on flag is set (page print is set), the switch 598 on flag is cleared. and set the switch 598 on flag (
When fractional page printing is set, the switch 608 on flag is cleared.

When the page print position designation key 61S is operated during input reading (9) on the operation board, step (
132), and the position data is updated. The position data is 0 for bottom left and 1 for bobbin thread.

2 corresponds to the page print position of the upper cloth, and 3 corresponds to the page print position of the upper row, and 1 is added to the position data each time the page print position designation key 61S is operated (133).

If the value is 4 (134), return it to O135)
, lights up a lamp corresponding to the position data (136).

When the page print posture key 62S is operated in the input reading (9) of the operation board, step (13) of FIG. 13g is performed.
7), and the orientation of the page print is changed. The page print posture key 62S is an alternate switch,
If there is a vertical flag, clear the vertical plug and display 62.
Turn off L2 and turn on display 62L1 139:
r side posture” set).

If there is no vertical flag, set the vertical flag and display 62.
Turn off L1 and turn on display 62L2 (140:
``Vertical posture'' set).

Processing corresponding to the other key human forces shown in FIGS. 13f and 13g will be explained.

Magnification adjustment key 5 '5 U key manually (101)
.

The enlargement magnification is successively set at dt1 time intervals and the value is displayed in the 1 magnification register (102 to 104).

By manual power of the magnification adjustment key 55D (105).

The reduction magnification is set sequentially at dti time intervals and the value is displayed in the magnification register (106.107.104).

Manually pressing the paper cassette selection key 50 (108)
, when the upper cassette 11 is selected (109), the lower cassette 12 (111) is selected, and when the lower cassette 12 is selected (109)
In 9), the paper feed system is changed for each of the upper cassettes 11 (110), and a corresponding display is performed.

When operating the scale print designation key 64S (141)
, if there is no switch 648 on flag (142)
, set it, set the contents of the copy magnification register in the scale magnification register, and turn on the display 64L (143
), but with the switch 648 on flag (142
), clear it and turn off the display 64L (144)
do.

When the scale print magnification designation key 63S is operated,
It is detected in step (145), and the set/reset state of the switch 638 on flag is reversed. That is,
If the switch 638 on flag has been reset, the switch 638 on flag is set and the display 63L is turned on (147).

In this case, if you input numerical values from the numeric keypad 44 while pressing the key 63S (21a and 21b in Fig. 13a)
, in the subroutine of step (21e) in FIG. 13a,
The input value is read into the scale factor register. Also,
When the switch 635 on flag is set, the switch 638 on flag is reset and the 2nd display 63
The subroutine of step (21c) in FIG. 13a turns off the switch 63 (146 and 148).
If the numeric keypad 44 is operated without the 3-on flag, the process returns to step (22).

In step (149), when the operation of the fold print specification key 66S is detected, if there is no switch 668 on flag (150), it is set (151), but if there is a switch 663 on flag (150), it is cleared. do. At this time, the display 66L
Change the display.

In step (153), when the operation of the fixed pattern print information selection key 65S is detected, if there is no switch 658 on flag (150), it is set to turn on the display 65L (151), and if there is a switch 65S on flag (151), 150), clear it and display 65
Turn off the L light (151).

In this case, when the switch 658 is in the on-flag state and a value is input from the numeric keypad 44 while pressing this key 65S (21a and 21d in FIG. 13a), the first
In the subroutine of step (21e) in Figure 3a, the input value is read into the text N o register. This subroutine (21g) returns to step (22) when the numeric keypad 44 is operated without the switch 658 on flag.・The operation of the double-sided copy designation key 67S is detected at step (154), and the switch 673 on flag is set. /Replace the reset state. In this case, if there is no switch 678 on flag (155).

Since double-sided copying was not specified in the previous process, I set it and turned on the display 65L (151), but
If the switch 658 is on, there are two possible processes before that. The first thing is.

This is a state in which the creation of a double-sided copy has been completed, and the second state is a state in which the creation of a copy of the first side of the double-sided copy has been completed. These states can be determined by checking whether there is a recording sheet on the intermediate tray 34. If the switch 67S has an on flag (155) and there is no recording sheet in the intermediate tray 34 (158), the first state is reached, and this flag is cleared to turn off the indicator 67L. switch 6
If the 75 on flag is present (155) and there is a recording sheet in the intermediate tray 34 (15g), this is the second state and no changes are made to the settings.

The various conditions for creating a copy are set by the operator's operations described above. Here, when setting the area in mode A, whether to erase the inside or outside of the specified rectangular area depends on the diagonal points of the rectangular area.
Please note that it is determined by the human power value of the numeric keypad for the first corner specified. 1st division 10 of scale 100
0a and the second scale 100b have different scale values and are assigned to different processing modes (Nakazuke, Sleepover), so the processing mode is automatically set by the manual value of the numeric keypad. . This eliminates the need for the operator to perform key operations to specify "nakazuke" or "sleepover".

Finish setting the copy conditions and press the print start key 43.
When is pressed (10a), if page printing or fractional page printing is specified (10b), a page count setting subroutine is executed (10c). This subroutine is shown in FIG. 13h. In this embodiment, the operation of the print start key 43 is considered to be synonymous with replacing the original.

When mode A is set for page printing,
The same recording sheet is fed repeatedly.

If you print the page with the edges reversed, only that part will be crushed in black. Therefore, in order to print only the first time and prohibit page printing from the second time onward, it is necessary to detect the first feeding of the recording sheet. Step (200
) to (205) are steps for detecting this. That is, with switch 58S on plug (200),
If the white lamp is lit on the display 58L (201)
, is the first stage of mode A, and means the first feeding of the recording sheet. However, as mentioned above, mode A
Since the first stage may be set from the second stage of Sometimes it is in a reset state. In this state, the page counter is incremented by 1, a count flag is set, and the inhibition of page writing is canceled (203).

When the first stage is set from the second stage, there is a count flag, so page writing is prohibited (202 and 204
). However, writing on this page is prohibited.

This only prohibits page printing by the eraser 24 and liquid crystal shutter 244, but does not prohibit the one-image exposure shutter 200 from blocking light to the page print area. Display 58L
If the lamp is red (201), then mode A is expected to end, so the count flag is cleared (205).
). In this case as well, writing on one page remains prohibited.

If there is no switch 588 on flag, it is not mode A (200), so the page counter is incremented by 1 and the inhibition of page writing is canceled (206).

If the switch 608 has an on flag (207).

Since the start page is specified, the value of the page counter is added to the value of the page start register set by the operator. At this time, since the page will be printed from the set value, start the page, subtract 1 from the value of Dostar, add the value of the page counter to this value, and store it in the page register (208), Specify the start page. If there is no switch 608 on flag
Store the value of the 1 page counter in the page register (209)
, CPU.

Execute page printing using the value of this page register.

Position data indicating the print position of the page set in steps (132) to (136) is stored in the position register (210).

In double-sided copying, one side of the copy is considered to be bound and compiled, so if the page print position is the same on the front and back sides of the copy, the printed page will be in the binding margin. It will end up being hidden. Therefore, when single-sided copying is specified (211), position conversion processing is executed.

If the page counter is an odd number (212), it is a front copy, and the page print position is specified by the operator (
Steps 132 to 136) in Fig. 13g are performed on the front side of the recording sheet, so there is no need to perform position conversion, but when the page 1 counter is an even number (212
), so it will be a copy of the back side.

Perform the conversion. Referring now to Figure 2a.

In the copying apparatus of this embodiment, in the case of double-sided copying, the recording sheet with a copy on the front side that exits the fixing unit 21 is
The transport direction control mechanism 31 sends the paper to an upper reversing route, returns it, and then sends it to a lower return route where it is reversed. In other words, since the recording sheet is always reversed in the conveying direction, the position conversion is independent of the vertical/horizontal orientation of the page print. In other words, the value of the position register is 0 (
1 (table below) when it is (downward), and 0 ( when it is 1 (table below)).
3 (upper table) when 2 (upper cloth), 3 (upper table)
When , each is converted to 2 (upper cloth) (213).

When the page count setting subroutine of step (10c) is exited and the main routine is returned.

Steps (11) - (12) - (13) - (14
) −(15) −(16) −(17) −(1g)
-(19) -(20) -(8)-(9)-...
. . . , or step (11) . . . to perform the copying process.

"Start cycle processing J (12) performs processing necessary to start the copy process such as initialization of the photoconductor. Most of the copy process including control of the eraser 24 is performed in "1 copy processing J (13). ).In other words, the timing pulses (not shown) output every minute rotation of the photosensitive drum 9 are constantly counted, the timing is grasped by checking the value, and the control is performed according to each timing. Control of the eraser 24 is started from the tip erase timing T1.

Every time the erase area changes, that is, in mode A, timings TI, T2, . . . in FIG. 7a. T3゜T4. T
5 and T6, the data set in the eraser driver 245 is updated.

In the case of the character print mode (mode B), if the diagonal small square in Fig. 7a is set as the print area, each time the erase area changes, that is, timings Tl and T2 in Fig. 7a. ．． T3. T4. T
At timings 5 and T6, the data set in the eraser driver 245 is updated, and between timings T3 and T4, character recording that also serves as erasing is performed in which the character information area is shielded from light and the other areas are transparent within the diagonally shaded small square. It is done.

Fixed pattern information such as sentences is stored in the ROM 241E of the control unit 241 (FIG. 4b) for each number. Since the number input specifying one piece of text information has been read in steps (21d and 21e) in FIG. 13a, if there is a designation to print text, etc.,
When entering the 1 copy process (13), the CPU of the control unit 241 receives an instruction from the microprocessor 80.
241A. The CPU 241A provides image information (vixels) for each line of text information to the liquid crystal driver 245 based on this information when the erased portion enters the print area. In response to this, the microprocessor 80 controls light transmission/non-transmission of the image exposure shutter 200 as described above in order to block image exposure of this area when the exposure area enters the print area after a predetermined delay. do.

When there is a 603 ON flag specifying page printing, the microprocessor 80 has detected the recording sheet size in advance, so in the 1 copy process (FIG. 13a), the position register (FIG. 13a) processed in the page count setting subroutine is 10c and 13h figures 213-215)
The CPU 24LA of the control unit 241 is instructed to read out the page print position indicated by and the numerical information indicated by the page register (FIG. 13a, 10c and FIG. 13h, 200 to 210). If page writing is not prohibited, the CPU 241A reads the numerical information in the specified direction, and when the erased area has progressed to the corresponding area, the CPU 241A sends the image information (pixel) for each line to the liquid crystal driver 245 based on this information. give. When the exposed area enters the page print area after a delay of a predetermined time, the microprocessor 80 operates the image exposure shutter 200 as described above in order to cut off the image exposure of this area, regardless of whether or not page writing is prohibited. Light transmission/
Control opacity.

The processing when the fractional page print switch 595 on flag is present is the same as the page print processing described above, but the print information for the number of one page, the "/" and the print information for the total number of pages stored in the fractional page register are combined. and "page/all pages"
The difference is that

If scale printing is specified, ■Copy processing (
In step 13), the microprocessor 80 sends area data and scale magnification for printing scales to the upper and lower margin portions and left and right margin portions to the control unit 241 based on the recording sheet size.

The control unit 241 controls the RO in the area indicated by the area data.
The vertical scale data and horizontal scale data stored in the M24LD are magnified at the specified magnification.

The information to be read is created and given to the driver 245.

In response to this, when the exposed area becomes that area, the image light blocking information of the area is transferred from the microprocessor 80 to the control unit 82, so that the control unit 82
Exposure of the scale writing area is blocked based on the given image light blocking information.

Similarly, when fold print is specified, the microprocessor 80 provides fold position data and fold print instruction data to the erase control unit 241 in the 1 copy process (13), and the 1 image exposure shutter control unit 8
2, information is given to indicate that the area specified by the folding position data is to be shaded.

The control unit 241 sets the area indicated by the fold position data to
Information for printing the folded part "+" stored in the ROM 241D is created and given to the driver 245. The control unit 82 blocks exposure of the folded writing area based on the provided image light blocking information.

In the copy process without switch 573 on flag and switch 588 on flag, steps (91), (93), (95) of FIG. 13b
.

Recording paper area ((Sl, T2) adjusted in (97).

(S2.T5): If there is no adjustment, erasing outside the JIA quasi-area for the recording paper size is performed.

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 67L shown in FIG. .

Copying is performed at the magnification set using the magnification adjustment keys 55U and 55D. Since this copy control operation is well known, detailed explanation will be omitted.

2. Double-sided mode: When the operator presses the double-sided copy designation key 67S, the display 67L lights up. With the display 67L lit, press the print key to copy the 1st M draft. copy is second
By the conveyance direction control mechanism 31 shown in Fig. a, the paper is sent to the upper conveyance path, then returned, guided to the lower conveyance path, and stored upside 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 copy mode B selection key 57S, the display 57L lights up (mode B setting). Display 57L
When the scan key 105S is pressed after is lit, display 1
05L lights up (scan mode setting). In this state, the operator presses the movement designation key 70±X.

70±y to drive the scale 100 to the desired position, enter the y coordinate (scale graduation) using the numeric keypad 44, and select "
," key 44' is pressed.

As a result, the coordinates of the first corner of the print area are read into the copying machine. Next, the operator presses the movement designation key 7 again.
Operate 0±x and 70±y to drive the scale 100 to the desired position.

Enter y & 1 (scale graduation) using the numeric keypad 44 and press the key 44'. This allows the second corner of the print area (
The coordinates of the diagonal corner) are read into the copying machine. Next, when the operator presses the scan key 105S, the display 105L
The light goes out and the carriage 99 returns to its home position.

The operator presses the fixed pattern print information selection key 65S.
If you input a numerical value using the numeric keypad 44 while pressing , 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 copy mode A selection key 58S, the white lamp on the display 58L lights up (first stage setting of mode A). In this.

The erasure area (or extraction area) is specified in 3. above. Make the settings in the same way. However, in this area setting, the first
Depending on whether the scale or the second scale is used, it is determined whether the inside or outside of the set area is to be erased. When you set the first original and press the print key 43, a copy with the inside (or outside of the set area) of the original set erased will be copied to the second a
The conveyance direction control mechanism 31 shown in the figure guides the paper to the lower conveyance path and stores it in the intermediate tray 34 without being reversed. At this time, the indicator 58L is changed to turn on the red lamp (the second stage of mode A is set). When you set the second original, set area extraction (or deletion), and press the print key 43,
You can obtain a copy (edited copy) in which the image of the set area of the second original (with outside or inside erased) is inserted and combined with the copy of the intermediate tray 34 in which the inside (or outside of the set area) of the first original is erased. It will be done.

This copy is ejected to the outside, but if the key 58S is operated again in the second stage of mode A (red lamp lit), the copy returns to the first stage of mode A (white lamp lit) and is placed in the intermediate tray again.
It is accommodated in 4.

5. Combined mode of modes B and A: The operator uses 3. above. input operation and 4 above. After performing the input operation, press the print key 43, and then press the print key 43.
After completing the copying of the draft at J7, the user operates the copy mode B selection key 57S to turn off the indicator light 57L and copies the second g draft. Alternatively, the 4° input operation described above is performed to copy the 1st G draft, and then the 3° input operation is performed to copy the 2M draft.

According to this, it is possible to create a composite copy without erasing the image (the background of the characters) of the print area such as text characters. That is, specify mode A and mode B together,
Conditions without image information, for example, a white original image, mode B
Mode A: prints characters, etc. on a recording sheet, and then overlays the original image without specifying an area.
If the second stage, that is, normal copying, is executed, a copy in which a fixed pattern such as text is superimposed on the original image is obtained.

In this case, it is possible to create a normal copy first. In other words, a normal copy is made in the first stage of mode A with no area specified, and the second stage of mode A is re-fed.
If mode B is also designated in the column and characters are printed without the original image, a superimposed copy can be created in the same way.

6. Above 2. and 3. Combined use mode: The operator uses the above 2. After performing the input operations in step 3 and step 3 above, press the print key. You will get a copy with the same text printed on the front and back. If the 3° operation is performed again after copying the 1st gK draft, another text will be printed on the copy (back side) of the 2nd JM draft.

7. Above 2. and 4. Combined use mode: Composite copy of two originals (1st and 2nd M drafts) on the front side,
It is also a mode that makes a composite copy of two originals (3rd and 4th originals) on the back side, but in this mode, the front side of the duplex mode is copied in mode A, and the back side is copied in mode A. All you have to do is 3. for each of the front and back copies. requires input operations.

8. 2 above. and 5. Combined use mode: In duplex mode copying, perform the input operation in step 5 above for each of the front side copy and the back side copy.

9. Page print mode: The operator performs steps 16 to 8 above. In addition to the mode setting operation, the user inputs the start page from the numeric keypad 44 while pressing the page print designation key 60S with the display 60L lit (1 if no input is made). In this mode, operate the page 1 print position designation key 61S to
4, and operate the page print orientation designation key 628 to display the display 62L1.
Alternatively, it is possible to specify a desired page print orientation as indicated by the lighting of 62L2. When you press the print key 43,
The number of original changes is printed as the number of pages from the start page in the set position and orientation, and the number of times the document is replaced is printed as the number of pages from the start page. ~8. A copy with the image determined by the mode is obtained.

In this case, if mode A in which the same recording sheet is repeatedly fed is set.

Page printing is performed only on the first feeding of the page, and if double-sided copying is set, the page printing positions for the front side and the back side are automatically changed. Also, the size of the recording sheet is determined by the paper feed cassette (11 or 12 in Figure 2a).
) is detected by reading the detection mark, the print position is automatically set according to the position specification.

10. Fractional page print mode: The operator performs the above 1. ~8. In addition to the mode setting operation, with the display 59L lit, the user presses the fractional page print designation key 59S and then operates the numeric keypad 44 to input the total number of pages (M manuscript number). Thereafter, the switch 61S is operated to light up the indicators 61L1 to 61L4 indicating the desired position. In this mode.

It differs from the above 9° in that "page/all pages" is printed, and other points are the same.

11. Scale print mode: The operator performs the above 1. ~10. In addition to the mode setting operation, the scale print designation key 64S is pressed to light the display 60L. If scale printing at the set copy magnification is acceptable, the print key 43 is pressed.

When you want to change the scale magnification, press switch 635.
Press to light up the display 63S, and press the key 63S.
Press and hold S) to input the scale recording magnification by operating the numeric keypad 44. When the print key 43 is pressed, the scale is printed on the left and right margins and the top and bottom margins of the recording paper. -10. A copy with the image determined by the mode is obtained. This allows the operator to know the image area to be edited.

12. Fold-fold printing mode: The operator performs the above 1. ~11. In addition to the mode setting operation, press the fold print designation key 66S to display the
Turn on L.

When the print key 43 is pressed, a "+" mark is printed on the upper and lower margins of the center of the sheet in the exposure scanning direction based on the detected recording sheet size, and the above 1. A copy in which an image determined by the modes 1 to 11 is recorded can be obtained.

In the embodiment described above, the scale 100 is placed on the exposure scanning carriage 99, and the scale 100 is driven in the exposure scanning direction and stopped at a desired exposure scanning position, and the numeric keypad 44 and comma key 44 are driven. ’ for 1
By inputting the coordinate information of one axis and reading the coordinates of the other axis as the position information of the carriage, corner coordinates for area specification can be input.However, the scale 41X attached to the edge of the contact glass plate and 41Y, coordinate data for both axes may be input using the numeric keypad 44 or the like. Similar to this.

The position of the page print specification may also be specified using coordinate data to obtain more freedom. In this case, in duplex mode, the page print position may be specified symmetrically with respect to the center line of the recording sheet. Just do the conversion.

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.

■Effects As described above, 1. According to the present invention, the eraser 24 is an erase light source 240 and a liquid crystal shutter 244, and the liquid crystal shutter 244 is a light transmission control electrode, that is, a segment electrode arranged in the width direction of the photoreceptor, and each segment By selectively applying a destination control voltage to the electrodes, it is possible to control light transmission/non-transmission for each dot.
This allows you to refeed recording sheets with printed text, or recording sheets with copied original images.

For example, when adding patterns to photographs, paintings, etc., it is possible to easily make a composite copy in which characters, marks, etc. that are not present in the original are superimposed.

In addition to this, editing copying may be performed, such as extracting or erasing a part of one image, and inserting the extracted image into the erased part.

Furthermore, even if the light transmission/non-transmission is controlled for each dot, it is possible to finely arrange and wire the segment electrodes and extraction leads using printed wiring technology, so complex electrical connections such as lead connection of individual light emitting diodes can be avoided. Connections can be omitted and lead wiring can be made more compact.

[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 partially 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 external appearance of 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 24 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. It is a time chart showing the momentum signal. FIG. 5 is a block diagram showing the electrical circuit configuration of the copying machine shown in FIG. 1. 6a is a block diagram showing a specific configuration of the control unit 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 ICI shown in FIG. 6a, FIG. 6c is a timing chart showing signal states of each part of the control unit 82 at a certain timing. 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. Figure 13a, Figure 13bll, Figure 13c, Figure 13d,
13e, 13f, 13g, and 13h are flowcharts showing the general operation of the microcomputer 80 shown in FIG. 1: Contact glass 2: Pressure plate 3: Illumination lamp 4: First mirror 5: Second mirror 6: Third mirror 7: Lens
8: Fourth mirror 9: Photoconductor drum E-O2 developer unit 11.12: Paper feed cassette 13.15: Paper feed roller for paper feed cassette 14.16.1
8: 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 240: Cathode ray tube (erase light source) 241: Eraser control unit 244: Liquid crystal shutter 245: Liquid crystal driver (Liquid crystal biasing means) 31: Conveyance direction control mechanism 32: Conveyance roller 33: Conveyance belt 34: Intermediate tray 35: Paper feed roller for intermediate tray 32. 36: Feed rollers 31 to 36: Return path (sheet refeeding means) )41x:X
Scale 41y: Y scale 42: Operation board 43 Print start key 44: Numeric keypad 46: Set number display 47: Copy number display 57S: Copy mode B designation key 58S: Copy mode A designation key 59S: Fractional page print designation Key 60S = Page print designation key 61S: Page print position designation key 62S: Page print position designation key 70+x, 70-x, 70+y, 70-y: Movement designation key 71+X, 70+31: Movement amount indicator 77: Image exposure shutter driver 80: Microcomputer 82: Control unit 93.94: Programmable interval timer 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 (3)

[Claims] (1) Image light is projected onto a uniformly charged photoconductor via an optical system to form an electrostatic latent image, and this electrostatic latent image is developed to transfer a visible image onto a recording sheet. In a type of copying machine that uses: 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 is located between the erase light source and the photoreceptor and is divided in the width direction. arranged liquid crystal shutters; 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; and a recording sheet after the visible image has been transferred to the visible image transfer surface. A copying apparatus comprising: a sheet refeeding means for guiding the sheet to the photoreceptor again as a transfer surface. (2) The copying apparatus according to claim (1), wherein the sheet resupply means is a recording sheet conveying means for conveying the recording sheet after the visible image has been transferred. (3) The copying apparatus according to claim (1), wherein the erase light source is one cathode ray tube extending in the width direction of the photoreceptor.