JPH0132500B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrophotographic apparatus having an editing function. Conventionally, the main purpose of electrophotographic apparatuses has been to faithfully reproduce the information contained in an original painting, and great efforts have been made to obtain reproductions that are closer to the original. As a result, it is now possible to obtain considerably better reproductions, and in particular, with black-and-white copying machines, it has become possible to obtain reproductions that are almost equivalent to some originals.

On the other hand, in practice, there are many cases where it is desired to erase unnecessary information in the original image or insert other information into the erased portion. For this reason, in the past, the original image was once copied, cut and pasted to create a new original image, and this was further copied to obtain the necessary information. Therefore, today's demands for copying machines include not only being able to faithfully reproduce the original picture, but also having such an editing function.

Generally, when editing a manuscript using a machine, characters are encoded using a typewriter, image information is broken down into bit patterns using a scanner, this is edited using a computer, and the output is sent to a printer or X-ray machine.
Images were played back by inputting them into a Y-Protector, etc. However, this method requires a typewriter or a high-speed scanner, and also requires an electronic computer for processing, which has drawbacks such as the time it takes to create a program.

Editing of information according to the present invention is performed by several devices incorporated into the electrophotographic device.

The electrophotographic apparatus according to the present invention can perform editing such as a skip mode and a blank insert mode.

Skip mode is a format in which a specific line of the original is skipped and the previous line and subsequent line are continued without any gaps. It is used to delete unnecessary or confidential parts without changing the appearance of the original.

The blank insert mode is a format in which specific line spacing in the original is widened and a blank space is provided there. It is used to add necessary information and to make the copy easier to read.

According to the electrophotographic apparatus of the present invention, in addition to normal copying, it is also possible to edit image information, so it is possible to create copies that are faithful to the original as well as copies that are different from the original. Useful for rationalization.

Accordingly, it is an object of the present invention to provide an improved electrophotographic apparatus.

A further object of the invention is to provide an electrophotographic apparatus having an editing function.

Hereinafter, the present invention will be described with reference to the attached drawings. FIG. 1 is a diagram schematically showing an example of an electrophotographic apparatus according to the present invention. Inside the apparatus main body 1, a photosensitive drum 2 and a transfer drum 3 having the same diameter are rotatably provided in contact with each other. The photosensitive drum 2 rotates counterclockwise, and the transfer drum 3 rotates clockwise. A charging corona discharger 4, a charge erasing device 5, a first developing device 6, a second developing device 7, a separating corona discharger 8, and a cleaning device 9 are installed around the photosensitive drum 2 along the rotation direction thereof. , a corona discharger 10 for static elimination, and a quenching lamp 11 are arranged, respectively.

A document table 12 having a transparent contact glass is arranged at the top of the apparatus main body 1, and a document 13 is placed thereon. Below the document table 12, there are an illumination lamp 14, a first reflection mirror 15, a second reflection mirror 16, an in-mirror lens 17, a third reflection mirror 18, and a color filter unit 19, each having a predetermined optical positional relationship. It is arranged as follows. The illumination lamp 14 and the first reflection mirror 15 move together from the position shown by the solid line to the position shown by the dashed line to scan the original 13 on the original platen 12.
At this time, the second reflecting mirror 16 also moves in the same direction at half the speed of the first reflecting mirror 15. The filter unit 19 includes a color separation filter and
An ND filter is set, and only the ND filter is used for normal black and white images.

When the photosensitive drum 2 rotates counterclockwise, its surface is uniformly charged by the charging corona discharger 4. When an optical image of the document 13 is irradiated onto the surface by an optical system, charges are dissipated in accordance with the optical image, and an electrostatic latent image is formed there. The charge erasing device 5, which will be described in detail later, is a charge control device for setting a charged area on the photoreceptor drum 2, and erases the charge on a predetermined portion of the surface of the photoreceptor to infiltrate that portion. This is used to prevent images from being created, and is not used in normal copy mode. The electrostatic latent image on the surface of the photoreceptor is visualized by a developing device. The first developing device 6 contains developer of any color other than black, and is used in the two-color mode. The second developing device 7 contains a black developer, and normally only this developing device is used. Development is performed by electrostatically adsorbing colored fine particles called toner in the developer to the electrostatic latent image. After development, the surface of the photoreceptor is subjected to discharge from a separating corona discharger 8, and the electric charge on the toner is removed.

The transfer drum 3 is provided with a transfer paper holding device 20, which holds the transfer paper 23 fed by the paper feed roller 22 on the circumferential surface of the transfer drum 3 by synchronizing this with the registration roller 21. do.
The rotations of the photoconductor drum 2 and transfer drum 3 are synchronized, and the leading edge of the image on the photoconductor drum and the leading edge of the transfer paper on the transfer drum advance in unison, overlap at the point of contact between the two, and the leading edge of the image on the photoconductor toner image is transferred onto the transfer paper. Subsequently, the transfer paper is separated from the transfer drum 3 by the separation claw 24, and transferred to the fixing device 25.
and is discharged onto the tray 26. On the other hand, toner remaining on the surface of the photosensitive drum 2 is removed by a cleaning device 9, and charge remaining on the surface and inside of the photosensitive drum 2 is removed by a static eliminating corona discharger 10 and a quenching lamp 11. Ru.

In normal copy mode, both the photoreceptor drum and the transfer drum complete the copy cycle in one revolution, but for example, when copying in two-color mode, the photoreceptor drum and the transfer drum complete the copy cycle in two revolutions. finish.

The reproduction apparatus according to the invention incorporates special devices for carrying out several editing modes. Next, these devices will be explained. First, a line designation device, which is designated range setting means, will be explained with reference to FIG. This device 30 is a device for specifying both ends of a line or range to be changed in the scanning direction of a document for editing, and is provided on one side of the contact glass 12 in the vertical direction, that is, the longitudinal direction, on which the document is placed. ing. A guide rod 31 is fixed to the copying machine body on the side surface of the contact glass 12, and a first marker 32 and a first marker 32, which are the first and second designation means for designating each end, are attached to this rod 31. 2 markers 3
A reference marker 34 is non-slidably mounted in alignment with the tip of the contact glass, that is, the scanning start position. Each marker has a sensor 35, 3 extending outward in the horizontal direction.
6, 37 are attached. Each sensor is adapted to be located on the upper belt of a scale belt 40, which has a scale of pitch n and extends between two rollers 38,39. When the sensor is a photo coupler, the scale belt 40 is a transparent film, and the light emitting part and the light receiving part of the photo coupler sandwich this film. The scale belt 40 can also be made of magnetic tape, in which case the sensor becomes a magnetic head. The scale belt 40 is rotated in the direction of the arrow by a motor 41 connected to one roller 38.

In the above-described line specifying device 30, the first marker 32 corresponding to the first specifying means is located on the scanning start position side in the scanning direction of the document, in other words, at one end of the specified range, and The second marker 33, which corresponds to the second specifying means and is disposed at a position facing the first marker 32, is manually positioned, and the line or range to be changed in the document is located between the two markers. The scale belt 40 is provided with a reference point 42, and when the belt 40 is rotated in the direction of the arrow by the motor 41, the reference sensor 37 first detects the reference point 42, and a counter (not shown) connected to this sensor detects the reference point 42. Begin counting the number of tick marks that are cleared and pass under it. The number of counts when the reference point 42 passes under the first sensor 36 located at one end of the specified range mentioned above is stored in the computer, and the reference point 42 is also stored in the computer.
The number of counts when passing under 5 is similarly stored in the computer. As a result, the distance of each marker from the edge of the contact glass, that is, from the scanning start position, is stored, and several characteristic processes are performed based on this.

When specifying a line using a marker, instead of specifying a line to be changed, it is also possible to specify a line to be left unchanged. Also, if there are lines that should or should not be changed intermittently, you can specify them at once using many markers and have the computer memorize them.

If the exposure scanning system is of the type in which the lamp unit is stationary and the document table moves, a scale is provided directly on the side of the contact glass, and the distance of each marker from the scanning start position can be determined by moving the document table. It is preferable to detect this and store it in the computer.

Next, the charge erasing device will be explained with reference to FIG. This is a type of charge control device for partially charging the surface of the photoreceptor, and is a device for preventing the formation of a latent image on unnecessary portions of the photoreceptor without charging those portions. There are two types of devices: one that partially charges the photoreceptor and the other that partially erases the charge on the surface of the photoreceptor. In the former case, the input to the charging corona discharger is opened and closed as appropriate, or an opening/closing plate is provided on the front of the corona discharger, and this is opened and closed as appropriate to perform partial charging. In the latter case, a white mask means is provided on the document table, and the unnecessary portion of the document to be deleted is appropriately inserted and exposed to dissipate the charge in this portion, or a slit-type white exposure means is used for normal exposure. It is provided separately from the means, and the charges are erased by operating it as appropriate. The charge erasing device 5 shown in FIG. 3 is this last example. Since the portion of the document to be deleted may be extremely narrow, the exposure must be a narrow slit exposure with a width of about 0.5 to 3 mm that operates at high speed.

In FIG. 3, reference numeral 51 designates a lamp housing in which a lamp 53 provided with a reflector 52 is housed. lamp housing 51
is an elongated casing that is slightly longer than this width along the width direction of the photoreceptor drum, and its lower part is constricted and continues into another narrower casing portion 51a. A biconvex cylindrical lens 54 is fitted into the boundary between the upper casing and the lower casing within the lamp housing. A horizontal slit 51b and a vertical slit 51c connecting the centers of the lamp 53 and the lens 54 are provided at the center of the lower housing. Partition plates 51d and 51e are provided above and below the horizontal slit 51b to allow a vertical slit with a width of 0.5 to 3 mm. A shielding plate 55 having a slit having the same width as the vertical slits provided in both partition plates is inserted between the horizontal slits. On one side of the shielding plate 55,
An armature 56 is fixed, and a tension coil spring 57 is fixed to the other side. As a result, the shielding plate 55 is constantly pulled in the direction of the arrow, so that the slits in the shielding plate 55 do not match the vertical slits provided in the partition plates 51d and 51e. Electromagnet 58 facing armature 56
is provided, and when this electromagnet is energized, the armature 56 is attracted to it, and the slits in the shielding plate 55 and the slits in both the partition plates 51d and 51e match. Therefore, while the electromagnet is energized, slit exposure with white light is performed and the charges on the surface of the photoreceptor are erased.

Charge control by such charge erasing device 5 is as follows:
In the case of this embodiment, in the first image forming process, the first area on the photosensitive drum 2 corresponding to one end specified by the first marker 32 in the specified range described above from the scanning start position of the document is In a charged state,
Further, the setting is such that a second area on the photosensitive drum 2 corresponding to the specified range from one end to the trailing edge of the document can be brought into a charged state in the second image forming process.

Next, the scanning system movement position detection device 60 will be explained with reference to FIGS. 4 to 7. The scanning system movement position detection device is a device for detecting the movement position of the exposure scanning system from the exposure scanning start position, which is necessary when performing editing such as skip mode or blank insert mode. In skip mode, it is necessary to skip a particular line of the document and allow the next line to continue on the previous line. For this reason,
In the second image forming process, the exposure scanning system must be synchronized in advance of the normal synchronization position of the photoreceptor drum. In addition, in the case of blank insert mode, it is necessary to provide blanks between specific lines of the original, so in the second image forming process, the exposure scanning system is moved slower than the normal synchronous position of the photoreceptor drum. must be synchronized. In this way, this device is used to delay or advance the synchronization start point for the photosensitive drum of the scanning system, and the amount by which this synchronization start point is delayed or advanced is determined by the above-mentioned movement position of the exposure scanning system. Set based on

As shown in FIGS. 4 and 5, the lamp unit 61 of the exposure scanning system is similar to that of a normal copying machine, and the entire unit slides while being supported by a guide rod 62, and has a lamp 63 and a reflector 64 inside. ,6
5. Reflection mirrors 66 are arranged with a predetermined optical positional relationship. What is different from the conventional device is the three sensors 6 provided in the lamp unit 61.
7, 68, 69, and a scale plate 70 provided parallel to the guide rod 62. The scale plate 70, as shown in FIG.
The interval between 8 and 69 is n+n/3, where n is larger than the width of the sensor. By arranging the sensors in this manner, it is possible to know the amount of movement of the lamp unit and its position, as well as the direction of movement. That is, when the lamp unit moves in the direction of arrow A, the order in which the three sensors detect the scale is sensor 68, 67, 69.
When the lamp unit moves in the direction of arrow B, the order is that of sensors 68, 69, and 67. Therefore, the direction of movement of the lamp unit can be determined by the order of input signals received from each sensor, and the amount of movement can be determined by combining the input signals. The amount of movement is calculated from the home position of the lamp unit, that is, the scanning start position, in synchronization with other devices. Therefore, even if the lamp unit stops midway, its position can be known from the count number. Note that the scale plate 70 may be a magnetic tape, a magnetic rod, or the like.

The lamp unit must be synchronized with the photoreceptor drum, but in this device it must also be able to be driven independently of the photoreceptor drum.
Therefore, as shown in FIG. 7, the shaft 7 of the motor 71 for driving the lamp unit 61 is
1a and the shaft 2a of the photosensitive drum 2 are provided with clutches 72 and 73, respectively. A sprocket wheel 74 is attached to the motor shaft 71a.
is fixed to the shaft 2a of the drum, and a chain 76 is stretched between the sprocket wheel 75 and a sprocket wheel 75 fixed to the shaft 2a of the drum. A pulley 77 is fixed to the shaft 2a of the drum, and a wire 80 is stretched between this pulley 77 and pulleys 78 and 79 provided at both ends of the contact glass 12. Lamp unit 61 is fixed to a wire section between pulleys 78 and 79.

Another sprocket wheel (not shown) is fixed to the shaft 2a of the photosensitive drum 2, and this sprocket wheel receives power and rotates the photosensitive drum 2 in a clockwise direction. At the same time, the sprocket wheel 77 also rotates, and the lamp unit 61 also moves in the direction of arrow A in synchronization with the photosensitive drum. At this time, the shaft 71a of the motor 71
A clutch 72 provided at the shaft 2a of the photosensitive drum is disengaged so that the power from the shaft 2a of the photosensitive drum is not transmitted to the motor 71. lamp unit 61
When reaches the end of its travel, clutch 72
The power of the motor 71 is transmitted to the wheels 74, and the lamp unit 61 moves in the direction of arrow B. At this time, the power from the motor 71 is applied to the photoreceptor drum 2.
The clutch 73 is disengaged to prevent the transmission from occurring. Therefore, by disengaging the clutch 73, the lamp unit 61 can be stopped at any desired position, and by operating the motor 71 and the clutch 72, it can be returned to its starting position at any time. .

If the exposure scanning system is not one in which the lamp unit moves as described above, but a type in which the lamp unit is stationary and the document table moves, the scale plate is installed directly on the document table, and each sensor is Similarly, it is preferable to provide the lamp unit or another immovable member at a position where all the scale marks on the document table can be covered when the document table is moved, that is, at the scanning start position. Further, in the apparatus shown in FIG. 7, the lamp unit 61 is not attached to the wire 80, but is provided stationary on the scanning start end side of the contact glass 12.
A document table containing a document plate is attached to a wire between pulleys 78 and 79.

Next, referring to FIG.
1 will be explained. This device is for detecting the movement position of the photoreceptor drum 2 from the initial position of electrostatic latent image formation, and is used to erase the charge on the photoreceptor area for the document area designated by the line designation device. This device is necessary when synchronizing the photoreceptor with the movement of the scanning system.

A scale disk 82 having a scale of pitch n is fixed to the shaft 2a of the photoreceptor drum 2, and when the photoreceptor drum 2 is normally at a predetermined rotation start position, that is, a scanning start position, the scale circle is Board 8
The two reference points 83 are located on a sensor 84 provided on the main body of the copying machine. Therefore, the contents of this sensor 84 and the counter connected thereto are counted in advance by the line specifying device, and the charge erasing device is mechanically set at an angle and corrected by converting the number of pulses, etc. If the contents of the counter and the sequence timing match the data stored in the memory, the electric charge on the designated portion of the photoreceptor can be erased. Similarly, the count number of the processing position such as skip mode detected by the line designation device and the count number of the counter connected to the scanning movement position detection device also match the sequence timing of the counter connected to the sensor 84. If you convert the magnification and store it in memory,
By checking the contents of the counter, the scanning optical system can be synchronized from a point later than or ahead of the normal synchronization position of the photoreceptor.

Of course, if the photoreceptor is plate-shaped, the scale plate is not a circular plate but a linear plate.

Next, the developing device 91 will be explained with reference to FIG. The developing device according to the present invention includes two developing devices. Even with two developing devices, three-color development can be performed by mixing colors. Also, if two or more developing devices are provided,
It is also possible to develop two or more colors. This invention includes such modifications.

When developing two colors using two developing devices, it is necessary to prevent the other developing devices from operating while one color is being developed. Otherwise, two developing devices will work and the developed image will have mixed colors. As a method of not operating the developing device, the method used in the present invention is to use a magnet in a non-magnetic sleeve as an electromagnet in a magnetic brush developing device, and to cut off power to the magnet when the developing device is not in operation. In FIG. 9, a developing device 91 includes a toner replenishing device 93, an impeller 94, a conveying roller 95, a developing roller 96, and a scraping plate 9 in a developing container 92.
7 are arranged at predetermined positions, respectively. The toner replenishing device 93 is a device for appropriately replenishing new toner into the developing container 92, and the toner 98 therein is thrown into the developing container by the rotation of the supplying arm 99. The impeller 94 is connected to the developer container 9
The developer 100 in the developer 100 is stirred and fluidized, and the toner and magnetic carrier constituting the developer 100 are each frictionally charged to a predetermined polarity.
The conveyance roller 95 consists of a non-magnetic sleeve 101 that rotates counterclockwise, and permanent magnets 102 and 103 that are statically housed inside the sleeve 101.
It has the role of attracting the developer 100 to the surface of the non-magnetic sleeve 101 and transporting it upward. The developing roller 96 is provided close to the conveying roller 95 and includes a non-magnetic sleeve 104 that rotates in a counterclockwise direction, and electromagnets 105, 106, and 107 that are statically housed inside the non-magnetic sleeve 104. Electromagnet 1
05, 106, 107 are switch 10 respectively
It is connected to the power supply 111 via 8, 109, and 110. When activated, switches 108, 10
9 and 110 are all closed, which energizes each electromagnet and transfers the developer on the conveying roller 95 onto the developing roller 96. The transferred developer is conveyed upward on the developing roller by the rotation of the non-magnetic sleeve 104, and on the way, the thickness of the developer layer is regulated by the doctor 112, and comes into contact with the photoreceptor drum 2. The electrostatic latent image on the photoreceptor drum is then visualized. Subsequently, the developer on the developing roller is removed from the developing roller by a scraping plate 97 and collected into the developing container 92 . Development is carried out by the toner in the developer being attracted to the electrostatic latent image, so the recovered developer has a lower toner concentration and an amount of new toner equivalent to the amount consumed by development. is replenished into the developing container from the toner replenishing device 93. When not developing, switches connected to each electromagnet are opened in the order of switches 108, 109, and 110 to stop new conveyance of the developer and remove the developer remaining on the developing roller with a scraping plate. Scrape everything off with 97.

Next, referring to FIG. 10, the control system when performing the editing mode will be explained. When the marker of the line designation device is set and detected by the sensor, this is input to the counter 121, and the position from the reference is counted. The output of the counter 121 is input to the second computer 123 through the input/output device 122. On the other hand, the output from each sensor of the scanning system position detection device is input to the gate circuit 124, which detects the combination of pulses and the moving direction of the scanning system.
The position of the scanner from the reference is counted by . The output of the up-down counter 125 is input to the second computer 123 through the input/output device 122. The second computer functions as a calculator, calculates the timing for operating the charge erasing device and the scanning system, etc. based on the data sent from the counter 121 and the up-down counter 125, and stores the results in the RAM 126.
The ROM 127 stores a program for performing this calculation. On the other hand, the output from the sensor of the photoreceptor position detection device is input to the counter 128, whereby the position of the photoreceptor is detected, and the result is sent to the first computer 130 through the input/output device 129. First computer 130
functions as a sequencer, assembles a sequence order from the data stored in the RAM 126 and the editing mode specified by the operator, and executes the sequence through the input/output device 131 based on the count result from the counter 128. ROM
Reference numeral 132 stores programs for performing sequences.

Next, referring to FIG. 10, the actual operation of each editing mode will be explained. For convenience of explanation, the output from the scale belt and scale plate in the line specifying device and the scanning system movement position detecting device is divided into six equal parts of the length in the scanning direction of the contact glass on which the original is placed, and The scale of the scale disk in the position detection device is divided into six equal parts of the circumference of the photoreceptor drum, and the count number of each scale is n0, n1, n2, n3,
Let them be n4 and n5. The length of the contact glass in the scanning direction is equal to the circumferential length of the photoreceptor drum. The original to be used is the size of the entire surface of the contact glass, and as shown in Figure 11, A, B,
It has rows C, D, and E, with counting performed between each row. Further, the angle between the position of the charge erasing device and the exposure position on the photosensitive drum is one scale.

First, the case where the skip mode is to skip line C will be explained. First, specify the mode using the control panel. The mode designation is performed because the calculation method of the second computer 123 for the output of the line designation device differs depending on each mode. Skip mode skips a certain line and
This is a style that continues the previous line and the next line. It requires two copies because you first copy the line before the line you want to skip, and then copy the line after that line. Specify the mode, set markers at both ends of line C, as shown in FIG. 12, and have the computer select the skip mode program. First, sensors attached to the first marker and the second marker detect the scale of the scale belt, and the counter 121 obtains count numbers n2 and n3, which are input into the second computer 123. As a result, during the first copying, the first computer 130 issues a command to the charging control device to charge and erase the portions below line C.

Therefore, when the photoreceptor drum starts rotating, the first
Each device operates according to instructions from the computer 130.

That is, in the first rotation, the surface of the photoreceptor is uniformly charged by the corona discharger, and when the counter 128 of the photoreceptor position detection device reaches count n2, the charge erasing device operates, and the portion of the surface of the photoreceptor below the C row is activated. The charge is erased. As a result, during copying during the first rotation of the photosensitive drum, latent images in rows A and B are formed, developed, and transferred.

On the other hand, during the second rotation of the photoreceptor drum, the counter 1 of the photoreceptor position detection device is activated by a command from the second computer 130 based on the mode designation.
The charge erasing device operates until 28 reaches count n2, and charges are erased from the portions of rows A and B on the surface of the photoreceptor, making it possible to form a latent image on the portions below row C.

At this time, the exposure scanning system is synchronized in advance of the photosensitive drum by a count of 1. As a result, the portions of rows B and C are projected by the scanning system onto the photoreceptor portions corresponding to rows A and B, but no image is formed on these portions because the electricity is turned off.
Rows D and E are formed in portions corresponding to rows C and D. When this is developed and transferred to the transfer paper on which lines A and B were previously transferred, a copy of lines A, B, D, and E with line C skipped is obtained as shown in FIG. 12.

In this case, the number of counts by which the exposure optical system is placed ahead of the photosensitive drum is n3-n2=n1 from the range designated by the marker. C row and D
When skipping a line, the second marker 33 is D.
Since it is set between rows and E rows, n4−n2=n2
become. The scanning system position detection device according to the present invention can move the scanning system of the lamp unit or document table by a predetermined number of counts. Therefore, the D and E rows may be developed and transferred first, and then the A and B rows may be developed and transferred. When the advance count number is 1, it is sufficient to advance the scanning system by the count number 1 and start synchronization with the photosensitive drum. In general, any skip mode can be obtained by starting synchronization when the difference between the count number of the scanning system position detection device and the count number of the photoreceptor position detection device becomes equal to a predetermined number of preceding counts. be able to. In addition, if the scanning system is operated from an intermediate position, image blur may occur, so use the device shown in Figure 7 to place the scanning system ahead of the synchronization point and move it from the synchronization speed to the synchronization point. It is preferable to move it at a slightly slower speed and mechanically connect it to the photoreceptor drum when the synchronization point is reached.

Next, the blank insert mode will be explained. This mode is a mode in which copies are made with a wide space between specific lines, and the first marker 32 corresponding to the first and second position specifying means in the line specifying device 30, which is the specified range setting means, and The second marker 33 specifies the range of spacing.

In other words, once this mode is set,
Similar to the skip mode, the first part of the specified range in the scanning direction of the original is once copied, and then the second part of the specified range is copied, so that two image forming steps are performed. and,
When setting this mode, the control system includes the line specifying device 30, which is the specified range setting means described above, the scanning system position detecting means 60, and the photoreceptor position detecting means 8.
1 is input, and based on this information, the charge erasing device 5, which is a charge control device, moves the electrostatic latent image from the initial position of forming the electrostatic latent image on the photosensitive drum 2 corresponding to the leading edge of the document to the first position described above. A command to execute an image forming process is issued, and a command to transfer a visualized electrostatic latent image obtained by exposing and scanning the charged first area with an exposure scanning system onto a transfer paper is issued. On the other hand, the second charge erasing device 5 described above
When executing the image forming process, the photosensitive drum 2 is rotated by a predetermined width determined by the end positions of the specified range by the line specifying device 30, and then the charge erasing device 5 is instructed to execute the above-mentioned second image forming process. The exposure scanning system is driven in accordance with the area on the photoreceptor drum 2 where the second image forming process is performed, and the electrostatic latent image obtained by this exposure scanning is visualized. A command is issued to transfer the visible image obtained in the first step onto the transfer paper.

Now, to explain a specific example of the operation of such a control system with reference to a drawing, as shown in FIG. Between line C and
Also, if the second marker 33 that specifies the other end of the specified range is set between the C line and the D line, the area specified by the marker will be opened below the B line.
Next, a command to copy line C and subsequent lines is issued by specifying the mode. First, as in the skip mode, the number of photoconductors is counted during the first copy.
The portions below n2 are charged and erased, forming latent images in rows A and B, which are developed and transferred. In the second copying, the charges on the photoreceptor up to count n3 are erased. Further, the exposure scanning system is synchronized with a delay of count 1 representing a predetermined width corresponding to a specified range from the photoconductor drum. That is, when the photoreceptor detection device counts n1, the scanning system starts synchronizing. As a result, each row is exposed one row at a time from the bottom. Since the portion of the photoreceptor up to n3 is de-energized, no latent image is formed, and latent images of lines C, D, and E, which are shifted by one line, are formed in the portion below n3. When this is developed and transferred to the transfer paper on which rows A and B were previously transferred, rows B and C as shown in Figure 13 2 are obtained.
You will get a copy with one line between the lines.

The difference between this mode and the skip mode is that this mode synchronizes the exposure scanning system with a delay of a predetermined number of counts behind the photoreceptor, whereas in the skip mode, the scanning system is synchronized in advance of the photoreceptor. The key is to synchronize it. Therefore, although the program is different, the processing is performed in the same way to find the difference between the count number of the scanning system position detection device and the count number of the photoreceptor detection device. In this mode as well, lines C, D, and E are developed and transferred first.
Next, rows A and B can be developed and transferred.

In the above embodiment, rows C and below are lowered one by one to provide a wide space between BC, but the same effect can be obtained by raising rows B and above. In this case, the same processing as in the skip mode is performed. That is, in the first copy, C,
Develop and transfer lines D and E to the normal position, and in the second copy, turn off the portion of the photoconductor with count number n1 or less, and synchronize by making the exposure scanning system lead the photoconductor by count number 1. let In this way, the image of line B is formed at the position of line A, and a wide blank space is created between line B and line C.

Each of the editing modes described above is just one example of using the device of the present invention, and many more editing modes can be created using the device of the present invention.

In addition, in the above embodiment, deletion was performed in row units, but the light source of the charge erasing device was not a single long tube, but small light emitting elements arranged in a row, and By providing a shielding plate to
It is possible to delete a specific part in one line.

Furthermore, various modifications can be made within the spirit of the invention and are included within the scope of the claims of the invention.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an example of an electrophotographic apparatus according to the present invention, FIG. 2 is a schematic diagram showing a line specifying device used in the apparatus according to the present invention, and FIG. 3 is a schematic diagram showing an example of an electrophotographic apparatus according to the present invention. 4 to 6 are schematic diagrams showing a scanning system moving position detection device used in the device of the present invention, and FIG. 7 is a schematic diagram showing a charge erasing device used in the device of the present invention. FIG. 8 is a schematic diagram showing a photoreceptor position detection device used in the apparatus of the present invention, and FIG. 9 is a schematic diagram showing a developing device used in the present invention. 10 are block diagrams showing a control system for performing the editing mode in this invention,
FIG. 11 is a diagram showing a manuscript used when explaining each editing mode, FIG. 12 is a diagram for explaining the skip mode, and FIG. 13 is a diagram for explaining the blank insert mode. 5... Charge erasing device, 30... Line designation device, 3
2, 33...Marker, 60...Scanning system movement position detection device, 81...Photoconductor position detection device.

Claims (1)

[Scope of Claims] 1. A document to be copied is placed on a document table, and the document is exposed and scanned by an exposure scanning system that moves from an exposure scanning start position, thereby starting exposure scanning on a rotating photoreceptor. Forming an electrostatic latent image corresponding to the position An electrostatic latent image is formed from the initial position, this electrostatic latent image is made into a visible image, and then the visible image is aligned with the leading edge of the image on the photoreceptor. in an electrophotographic apparatus that obtains a copy by transferring onto a transfer paper fed by a user, a first specifying means for specifying a scanning start position side of a specified range in the scanning direction of the document;
a second specifying means for specifying a position opposite to the first specifying means across the specified range;
a designated range setting means for setting both ends of the designated range; A second area on the photoreceptor corresponding to the position specified by the first specifying means to the trailing edge of the document in the specified range is charged in the second step.
a charging control device that brings the electrostatic latent image into a charged state in the process; a scanning system position detection means that detects the movement position of the exposure scanning system from the exposure scanning start position; and movement of the photoconductor from the initial position of forming the electrostatic latent image. Based on the information from the photoconductor position detection means, the specified range setting means, the scanning system position detection means, and the photoconductor position detection means, the charging control device detects the position of the photoconductor corresponding to the leading edge of the document. from the initial position of electrostatic latent image formation.
By carrying out the step of (1), the charged first area is exposed and scanned by the exposure scanning system, and the electrostatic latent image formed on the photoconductor by this exposure scanning is visualized, and the electrostatic latent image formed on the photoconductor is visualized, and the electrostatic latent image formed on the photoconductor is visualized. When the charge control device executes the second step, the photoreceptor is rotated by a predetermined width determined at both end positions of the designated range, and then the second step of the charge control device is executed. , and the exposure scanning system is driven to perform exposure scanning corresponding to the area on the photoconductor where this second step has been performed, and the electrostatic latent image formed on the photoconductor by this exposure scanning is visible. An electrophotographic apparatus comprising: a control system for transferring the visible image obtained in the first step to a transfer paper.