JPS6236680A - Image forming device - Google Patents

Abstract

PURPOSE:To simplify operation and to make the editing or the like of original images efficient by interrupting the formation of an image corresponding to an image forming range set up on the basis of a scale in a transfer part. CONSTITUTION:When an original A is set up on an original receiving part 73 so as to be adjusted on a fixing scale 83 and a key is operated while observing a spot light transmitted through the original A, the coordinate position of the original A is stored in a memory of a control part 120. When an erasing range specifying key is depressed, the erasing range of the original A is specified, the specified position is supplied from the control part 120 to a processor 101 as the erasing range and a prescribed calculated result is stored in the memory 106 as the erasing range. The original A is carried and set up on an original platen by operating plural keys, the data are read out from the memory 106, a lighting part of light emitting elements on a photosensitive drum is destaticized to erase the original image to be erased and a required original image is copied.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an image forming apparatus such as a multifunction machine having a document feeding device.

[Technical background of the invention and its problems] In general, image forming apparatuses such as copying machines have functions for reducing and enlarging original images, but they copy original images as they are.

However, in the above-described apparatus, it is desired to develop a function to edit and copy a document image, and in particular, there is a strong desire to develop a function to erase unnecessary portions of a document image and copy it.

[Object of the Invention] This invention has been made in view of the above circumstances, and its purpose is to easily form the image forming portion of a document image without making any procedural mistakes and with a simple operation while keeping the front side of the document facing up. It is an object of the present invention to provide an image forming apparatus which is capable of forming an image by specifying an image forming part or erasing an unnecessary part, and which is extremely convenient for editing a document image.

[Summary of the Invention] In order to achieve the above object, the present invention optically scans a document image supplied from a document feeder and placed on a document table, and transfers an image corresponding to the document image onto a transfer material. In the document feeder, there is provided a document receiving section having a translucent member that substantially coincides with the document platen on the surface of the document feeder, and a scale is provided on the surface side of the translucent member. The image forming range of the front side document set as a reference is specified by a specifying means provided on the back side of the transparent member, and after specifying by the specifying means, the document is reversed and conveyed onto the document table. When an image is formed on the document, the erasing means provided in the transfer means prevents the formation of an image corresponding to the image forming range specified by the specifying means.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

1 and 2 schematically show a copying machine as an image forming apparatus having an automatic document feeder according to the present invention.
It is. In other words, 1 is the main body of the copying machine, and on the top of this main body 1 is an automatic document feeder that automatically feeds originals! 11t6
0 is attached.

A document table (transparent glass plate) 2 is provided on the upper surface of the main body 1 and serves as a document placement section on which a document fed by the automatic document feeder 60 is placed.

The document placed on the document table 2 is exposed to an exposure optical system consisting of an exposure lamp 4 that reciprocates in the direction of the arrow, a mirror 5, 6, 7, a lens block 8 that is movable in the direction of the optical axis, and a fixed mirror 9. A system is provided, and by optically scanning the surface of the document using this optical system, an image of the document is formed on the surface (slit exposure). The photosensitive drum 10 rotates in the direction of arrow C in the figure, and the surface is first charged by the charging device 11, and then the image is exposed to slit light, thereby forming an electrostatic latent image on the surface. This electrostatic latent image is made visible by applying toner by a developing device 12.

On the other hand, the paper (image-forming object) P is taken out one by one from the selected upper paper feed cassette 13 or lower paper feed cassette 14 by the delivery roller 515 or 16, passes through the paper guide path 17 or 18, and then passes through the registration rollers. versus 19
and is guided to the transfer section by this pair of registration rollers 19. Here, the paper feed cassettes 13 and 14 are detachably provided at the lower right end of the main body 1, and one of them can be selected from an operation panel (not shown). The paper P sent to the transfer section comes into close contact with the surface of the photoreceptor drum 10 at the transfer charger 20, so that the toner image on the photoreceptor drum 10 is transferred by the action of the charger 20. be done. The transferred paper P is electrostatically peeled off from the photoreceptor drum 10 by the action of the peeling charger 21 and conveyed on the conveyor belt 22, and is transferred to a heat roller 23 as a fixing device provided at the end of the conveyor belt 22. The transferred image is fixed by passing through this area. After fixing, the paper P is delivered to a tray 25 outside the main body 1 by a pair of paper ejection rollers 24. Further, after the transfer, the photosensitive drum 10 is charged by a charger 26 for removing electricity, and then a cleaner 2
The residual toner on the surface is removed in step 7, and the static elimination lamp 2
8, the afterimage is erased to return to the initial state. Note that 29 is a cooling fan for preventing the temperature inside the main body 1 from rising.

FIG. 14 shows the operation panel 30 provided on the front edge of the upper surface of the main body 1. 301 is a copy key for commanding the start of copying, 302 is a numeric keypad for setting the number of copies, etc., 303 is a display unit for displaying the operating status of each part, paper jam, etc., and 304 is for upper and lower paper feed cassettes 13.14. A cassette selection key to be selected; 30s is a cassette display section that displays the selected cassette; 30s is a magnification setting key that sets the enlargement and reduction magnification of copying in a predetermined relationship; 307 is a stepless setting of the enlargement and reduction magnification. Zoom key, 30a
309 is a display section that displays the set magnification, and 309 is a density setting section that sets the copy density.

FIG. 15 shows an example of the configuration of a drive source for each drive section of the copying machine configured as described above, and is composed of the following motors. That is, 31 is a lens motor, which is a motor for moving the position of the lens block 8 for performing magnification change.

A mirror motor 32 is a motor for changing the distance (optical path length) between the mirror 5 and the mirror 6.7 for changing the magnification. A scanning motor 33 is a motor for moving the exposure lamp 4, the mirror 5, and the mirror 6.7 for scanning the original. A shutter motor 34 is a motor for moving a shutter (not shown) for adjusting the charging width of the photosensitive drum 10 by the charger 11 during zooming. 35 is a developing motor for driving the developing roller of the developing device 12, etc. 36 is a drum motor for driving the photosensitive drum 1o. 37
A fixing motor is a motor for driving the paper conveying path 22, the pair of fixing rollers 23, and the pair of paper ejecting rollers 24. 38 is a paper feed motor, which is connected to the feed roller 15.1.
This is a motor for driving 6. A paper feeding motor 39 is a motor for driving the registration roller pair 19. 40 is a fan motor, which is connected to the cooling fan 2.
This is a motor for driving 9.

FIG. 16 shows a drive mechanism for moving the optical system 3 back and forth. That is, the mirror 5 and the exposure lamp 4 are placed in the first carriage 411, and the mirror 6.7 is placed in the second carriage 411.
These carriages 41 are each supported by a carriage 422.

412 is guided by guide rails 42r and 422 and is movable in parallel in the direction of arrow a. That is, the four-phase pulse motor 33 drives the pulley 43. This pulley 4
An endless belt 45 is stretched between the mirror 3 and the idle pulley 44, and one end of a first carriage 411 that supports the mirror 5 is fixed to a midway portion of the belt 45.

On the other hand, two pulleys 47.47 are rotatably provided in the guide portion 46 of the second carriage 422 that supports the mirror 6.7 and are spaced apart in the axial direction of the rail 422. A wire 48 is strung around.

One end of this wire 48 is fixed to a fixed part 49, and the other end is fixed to the fixed part 49 via a coil spring 50. Further, one end of a first carriage 411 is fixed to a midway portion of the wire 48. Therefore, as the pulse motor 33 rotates, the belt 45 rotates, the first carriage 411 moves, and the second carriage 422 also moves accordingly. At this time, since the pulleys 47, 47 serve as movable pulleys, the second carriage 422 moves in the same direction as the first carriage 411 at 1/2 the speed. Note that the first and second carriages 4
The moving direction of 11.412 is controlled by switching the rotation direction of the pulse motor 33.

Further, on the document table 2, a copyable range corresponding to the specified paper is displayed. In other words, cassette selection key 3
If the paper size specified by 04 is (PxSPy) and the copy magnification specified by the magnification setting keys 30s and 307 is K, then the copyable range (X, V), rX-
PX/KJ.

ry-Py/Kl. This copyable range (X, y)
As shown in FIG. 17, the X direction is indicated by the pointers 51 and 52 provided on the back of the original loading platform 2, and the y direction is indicated by the scale 53 provided on the upper surface of the first carriage 411. It is now displayed by.

The above-mentioned pointers 51 and 52 are connected to the pulley '
55 and 55 via a spring 56. The pulley 55 is rotated by a motor 58, and by driving the rotation of the motor 58 according to the paper size and magnification, the distance between the pointers 51 and 52 can be changed. There is.

Further, the first carriage 411 is moved to a predetermined position (home position according to the magnification) by driving the motor 33 according to the paper size and magnification. And copy key 30! When the 1st
The carriage 411 is first moved toward the second carriage 412, and then the lamp 4 is turned on and the carriage 411 is moved away from the second carriage 412. When scanning of the original is completed, the lamp 4 is turned off and the first carriage 411
is returned to the home position.

As shown in FIGS. 1, 2, and 3, the automatic document feeder 60 is comprised of a paper feed section 61 that feeds an original mA, and a transport section 62 that transports the document. The paper feed unit 61 includes a document feed table 63 on which the document A is placed, and a paper feed roller 64 that feeds the document A placed on the document feed table 63.
, a conveyance roller 65, a separation roller 66, and a pair of aligning rollers 67 and 67. Further, a detector 69 is provided near the conveyance roller 65 to detect whether there is an empty document A on the document feed tray 63, and between the conveyance roller 65 and the aligning roller 65, A detector 70 for detecting abnormality in paper feeding is provided, and a detector 71 for detecting the size of the fed document A is provided near the aligning roller 65. These detectors 69, 70, 71 are composed of, for example, a detection lever and a microswitch. In addition, the document feed tray 63
At the top, document guides 72, 72 are provided which are set to a width corresponding to the width of the document A to be inserted.

Further, the conveying section 62 includes a document receiving section 73 formed of transparent glass on which the document to be trimmed (erased) is placed, and a pair of take-in rollers 74 that takes in the original IA from the document receiving section 73. .74, a guide 75 that guides the original MA taken in by this take-in roller pair 74.74 downward;
, an endless belt 76 as a document conveying means for conveying the document A supplied from the paper feed section 61, rollers 77 and 77 on which the endless belt 76 is mounted, and the belt 76 guided by the guide 75. rollers 78, 78, 78° 78 for pressing the document A onto the document table 2; The guide 80 guides the document A upwardly, and a pair of discharge rollers 81 and 81 discharges the document A guided by the guide 80 to the document receiver 73.

A conveyance path 76a is formed by the conveyance belt 76 and the document table 2. Near the pair of take-in rollers 74, 74, a detector 83 detects that the original A is pushed (inserted) from the original receiving section 73 into the original insertion slot 82.
A detector 84 is provided near the pair of paper discharge rollers 81, 81 to detect abnormality in the conveyance of the document A to be discharged. These detectors 83 and 84 are composed of, for example, a detection lever and a microswitch.

Further, the transport section 62 is provided with a detector 85 that optically detects whether the transport section 62 is opened or closed.

Furthermore, the document tray is located at the end of the document tray 73.
A fixed scale 89 is provided along the lateral direction of 3 to indicate a document setting reference.

Further, a movable spot light source 86 is provided at the bottom of the document receiver section 73. As shown in FIG. 4, this spot light source 86 is provided opposite to the document receiving portion 73, and is composed of a light emitting element 87 such as a light emitting diode or a lamp, and a lens 88.
The light emitted from the document receiver section 73 is passed through the lens 88.
It is designed to be irradiated as a spot light having a diameter d. This spot light is sent to the document receiving section 73! It has a brightness that allows it to pass through a document G with a thickness similar to that of a postcard.

The spot light source 86 is moved in the X direction and the Y direction in the drawing by a drive mechanism as shown in FIG. That is, the spot light +1186 is supported by a guide shaft 91 provided on the carriage 90, and this spot light source 86 is connected to a timing belt (toothed belt) 92 disposed along the guide shaft 91. There is. This timing belt 92 is wrapped around a pulley 94 provided on the rotating shaft of a pulse motor 93 and a driven pulley 95. Therefore, as the pulse motor 93 rotates, the spotlight 11186 is moved in the X direction in the figure.

Further, the carriage 90 has a guide rail 96a.

It is guided by a guide 96b and can freely move in parallel in the direction of the arrow y. A timing belt (belt with #lt) 97 is connected to the carriage 90 . This timing belt 97 is wrapped around a pulley 99 provided on the rotating shaft of a pulse motor 98 and a driven pulley (not shown). Therefore, as the pulse motor 98 rotates, the spot light source 86 is moved in the y direction in the figure. Further, a position sensor 90a consisting of a microswitch for detecting the initial position of the spot light source 86 is provided on the carriage 90 located at the end of the guide shaft 91 on the pulse motor 93 side. For example, when the spot light source 86 is moved, the spot light source 86 first comes into contact with the position sensor 90a and its initial position is detected.

Furthermore, an operation panel 100 for performing an erasing operation is provided above the paper feed section 61, as shown in FIG. 1. OOa, 100b, 100c.

100d is an operation key for moving the spotlight 186, 100e is a position designation key for inputting the coordinate position indicated by the spotlight [86], and 100f.

100Q is an erasure range designation key for designating the erasure range at each designated position.

FIG. 18 shows the overall control circuit.

First, the control circuit of the copying machine main body 1 will be explained.

That is, the main processor group 101 detects inputs from the operation panel 30 and input devices 102 such as various switches or sensors, and processes the high-voltage transformer 103 that drives the various chargers, the static elimination lamp 28, and the plate of the cleaner 27. The lensoid 27a, the heater 23a of the pair of fixing rollers 23, the exposure lamp 4, and each of the motors 31 to 40.58 are controlled to perform the copying operation described above. The memory 106 and the like are controlled to erase unnecessary portions of the document. The erase array 150, array driver 160, and memory 106 will be described later.

Among the above motors 31 to 40.58, motor 35.37
．． A toner motor 107 that supplies toner to 40 and the developing device 12 is controlled by the main processor group 101 via a motor driver 108 , and the motors 31 to 34 are controlled by the first sub-processor group 110 via a pulse motor driver 109 . The motors 36, 38, 39, 58 are controlled by a second sub-processor group 112 via a pulse motor driver 111. Further, the exposure lamp 4 is connected to the main processor group 10 through a lamp regulator 113.
1, the heater 23a is controlled by a heater control unit 114, and a status signal of the heater 23a is supplied to the main processor group 101.

Then, commands to drive and stop each motor are sent from the main processor group 101 to the first and second sub-processor groups 110 and 112.
12 to the main processor group 101, a status indicating the drive/stop state of each motor is sent. Furthermore, position information from a position sensor 113 that detects the initial positions of the motors 31 to 34 is input to the first sub-processor group 110.

The main processor group 101 also has a control circuit 1 on the automatic document feeder 60 side via an interface 114.
20 is connected.

The control circuit 120 is configured as shown in FIG. That is, 121 is a control unit that controls the entire document feeding device 60. The control section 121 determines the erasing mode and erasing enclosure according to the signal from the operation panel 100, and outputs an erasing mode signal and a signal indicating the erasing range to the main processor 101. The control unit 121 also controls the operation key 100a in the erase mode.

By driving the drivers 122, 123 in response to signals from ..., the motors 93, 98 are rotated, and the spot light source 87 is moved in the X direction as shown in FIGS. 5, 7, and 8. , which moves in the y direction. moreover,
The control unit 121 controls the switch F! f69.70.
Driver 1 according to the signals from 71, 83, 84.85
24 rotates the conveyance motor 125 and rotates each of the rollers.

Next, a method of specifying the erasing range of the document using the spot light source 86 will be described. This spot light source 86
is moved with the light emitting element 87 lit by operating the operation keys 100a to 100d described above. That is, when the operation keys 100b and 100d are pressed, the motor 98 is driven, and the carriage 90 and the spotlight 88 are driven.
6 is moved in the y direction. Also, an operation key 100a.

When i ooc is pressed, the motor 93 is driven and the spot light source 86 is moved in the X direction.

The operator operates the operation keys 100a to 100d while visually observing the spot light transmitted through the document A. For example, after moving the spotlight to point Si on the document A shown in FIG. 10(a), the operator presses the position designation key 100e. Press. Then, this Sl
The coordinate position specified by is stored in the internal memory in the control unit 121 (
(not shown). Similarly, when the position designation key 100e is pressed with the spotlight moved to 82 points on the document A, the positions of the 82 points are stored in the internal memory in the control section 121. The position of this spot light can be detected, for example, by counting the number of driving pulses of the pulse motors 98 and 93.

After this, when you press the erase range specification key 1001', the 10th
As shown in Figure (a), a rectangular area (indicated by diagonal lines) with 82 diagonal points St is designated as the erasure range. Also, as shown in FIG. 10(b), if you specify points 83 and 84 of the original 11A and press the erase range designation key 100Q, the area other than the square with the diagonal points of 83 and 84 will be erased. is specified as In this manner, when the erasure range designation keys 100f and 100cJ are pressed, the positions of the two designated points are supplied from the control unit 121 to the main processor group 101 via the interface 114.

As a result, the main processor group 101 performs calculations based on the designated two-point positions and copy magnification, and the memory 106 stores a high-level signal 111 in the erasing range.
A low level signal "0" is stored in the PI and other parts.

That is, this memory 106 is constituted by a RAM whose capacity in each column direction is approximately equal to the movement distance of the spotlight 8!86 in the X direction divided by the position resolution in the y force direction, and is supplied from the main processor group 101. Depending on the data, in the case of Fig. 10 (a), it will be as shown in Fig. 11 (a), and in the case of Fig. 10 (1)), it will be as shown in Fig. 11 (a).
As shown in FIG. 1(b), high level signals are stored in addresses corresponding to the shaded areas, and low level signals are stored in other addresses.

On the other hand, as shown in FIG. 20, an erasing array 150 as erasing means is provided close to the photosensitive drum 10, for example, between the charger 11 and the exposure fI3ph.

As shown in FIGS. 21 and 22, this erasing array 150 has a plurality of light-shielding cells 151 arranged in a direction perpendicular to the rotational direction of the photoreceptor 10, and a plurality of light-shielding cells 151 are arranged inside each of these light-shielding cells 151. As shown in Figure 23(a)(,b),
A light emitting element 152 made of, for example, a light emitting diode is provided. Furthermore, a lens 153 is provided in the opening of each cell 151 facing the photoreceptor drum 10 to focus the light from the light emitting element 152 onto the surface of the photoreceptor drum 10 .

The number of light emitting elements arranged in this erasing array 150 is, for example, the number of the spotlights #! The number of resolutions corresponds to the moving distance in the X direction of 86. Here, light emitting element 1
If the distance between the erase arrays 150 and 52 is P and the number is N, the total length of the erase array 150 is Q-NxP.

The erase array 150 is driven by the array driver 160 described above. . This array drive section 160 is the 24th
As shown in the figure, a shift register 161 having the same number of bits as the number of bits in the column direction of the memory 106, a store register 112 that holds the contents of this shift register 111, and an output signal of this store register 162 are turned on. , the switch circuit 164 is composed of a plurality of switch elements 163 that are controlled to be turned off, and the movable contacts 163a of these switch elements 163 are installed, and the fixed contacts 163b constitute the erasing array 150 via a resistor R, respectively. It is connected to each cathode of the light emitting element 152. The anode of each of these light emitting elements 152 is It
They are connected to the N source Vcc via the 2R limiting resistors R, respectively.

After specifying the erase range of the original as described above, the operator inserts the original A into the original insertion slot 92. As a result, the detector 83 detects the insertion of the document A. In this state, the operator turns on the copy key 30. Then, the document A is taken in by the take-in roller pair 74.74,
The document is conveyed through the guide 75 and the conveyance path 76a, and placed on the document table 2. After this placement, the first carriage 411 and the photosensitive drum 10 are operated, and one column of data is sequentially read out from the memory 106 in the row direction (as shown in FIG. 11). This read data DI is transferred to the shift register 161 of the array driving section 160 in response to the clock signal CLK.

After one column of data is transferred to the shift register 161, the charged portion of the photoreceptor drum 10 is transferred to the erase array 15.
When the value reaches 0, the main processor group 101 outputs a latch signal LTH, and the data stored in the shift register 161 is supplied to the store register 162 in response to this signal. That is, since the erasing array 150 is disposed between the band N unit 11 and the exposure section ph, the memory 106
For example, if the angle between the erasing array 150 and the exposure section ph is θ1, and the photosensitive drum 10 is rotating at each speed, one line of data outputted by is stored in the store register 162 before θ1/ω. The output timing of the latch signal LTH is controlled so that the latch signal LTH is supplied to the latch signal LTH.

Each switch element 163 of the switch circuit 164 is controlled by the output signal of the store register 162. That is, when the output level of the store register 162 is high level, it is turned on, and when it is low level, it is turned off. As a result, the light emitting elements 152 connected to each switch element 163 are turned on when the switch element 163 is on, and are turned off when the switch element 163 is off. Therefore, among the charged parts of the photoreceptor drum 10, the part where the light emitting element 152 is turned on is charge-free, and even if the charge-free part is exposed afterwards, no electrostatic latent image is formed, and the original image is not erased. It means that it was done. Thereafter, in the same manner, the data in the memory 1.06 is sequentially output one column at a time, and the image is erased.

Next, the operation in such a configuration will be explained.

First, a case will be described in which a predetermined portion of a document is erased and copied. For example, as shown in FIGS. 7 and 8, the operator should position the original IIA so that the front side is visible (with the front side facing up), and then, as shown in FIG. 9,
The document receiver is placed on the portion 73 in accordance with the fixed scale 83. Then, the operator operates the operation keys 100a to 100d while visually observing the spot light transmitted through the original A, and places a spot on the original A at point S1 shown in FIG. 10(a), for example.
-Press the position designation key 100e while moving the light.

Then, the coordinate position specified by this Sl is the control unit 121.
The data is stored in an internal memory (not shown) within the computer. Similarly, when the position specifying key 100e is pressed with the spotlight moved to the 82 points on the document A, the position of the 82 points is set by the control unit 121.
stored in internal memory.

After this, when the erasure range designation key 100f is pressed, a rectangular area (indicated by diagonal lines) with 82 points on the SL is designated as the erasure range, as shown in FIG. 10(a). The positions of the two points are set as the erasure range by the control unit 121.
is supplied to the main processor group 101 via an interface 114. As a result, the main processor group 10
1, and the memory 106 receives a high level signal II i 11 in the erase range area and a low level signal ITO! in the other areas. 1 is stored. That is, as shown in FIG. 11(a), the memory 106 has a high level signal II I 1 at the address corresponding to the erase range.
1 is written and low level signal II is written to other addresses.
ON is written.

Thereafter, the operator inserts the right end of the document A into the document insertion slot 82 and presses the copy key 301, as shown in FIG. Then, the main processor group 101 again operates the conveyor roller pair 74, 74 and the conveyor belt 76. As a result, the document A is taken in by the pair of take-in rollers 74, 74 . The conveyance belt 76 conveys the conveyance guide 75 and the conveyance path 76a.

Then, when the time has elapsed for the leading edge of the original mA to pass the stopper 79 on the document table 2, the main processor group 101 stops the conveyor belt 76, and moves the leading edge (left end) of the original A as shown in FIG. Then, stop it with the stopper 79.

After placing the original fiA on the document table 2, the first carriage 4
11 and photosensitive drum 10 are operated, one column of data is sequentially read out from the memory 106 in the row direction (as shown in FIG. 11).

This read data Dt is transferred to the shift register 161 of the array driving section 160 in response to the clock signal CLK. After one column of data has been transferred to the shift register 161, when the charged portion of the photoreceptor drum 10 reaches the erase array 150, the main processor group 101 outputs a latch signal LTH, and the shift is performed in accordance with this signal. The signal is supplied to register 162. This store register 1
Each switch element 163 of the switch circuit 164 is controlled by the output signal of 62. In other words, store register 1
When the output level of 62 is high level, it is turned on, and when it is low level, it is turned off. As a result, each switch element 163 is turned on when it is on, and turned off when it is off.

Therefore, among the charged parts of the photoreceptor drum 10, the part where the light emitting element 152 is turned on is charge-free, and even if the charge-free part is exposed afterwards, no electrostatic latent image is formed, and the original image is not erased. It means that it was done. Thereafter, data in the memory 106 is read out one column at a time in the same manner, and copies are made while erasing images. After this copying is completed, the main processor group 101 operates the belt 76 and the paper ejection roller pair 81.81. As a result, the document A is discharged onto the document receiving section 73 via the guide 80 and the pair of discharge rollers 81 and 81.

Further, when the operator places the document A on the document feed tray 63 and presses the copy key 301, the main processor group 10
1 is determined to be normal copying, and the original A is fed one by one by the paper feeding section 61 and conveyed onto the original platen 2, and normal copying is performed.

As described above, the erasing range of the original image is specified using a spot light source provided in the automatic document feeder, and the specified area is erased by lighting up a light emitting element placed opposite to the photoreceptor drum. ing. Therefore, the original image can be deleted and copied as desired, which is extremely convenient for editing the original. Furthermore, since there is no need to turn over the document when erasing or starting actual copying, the operation is simple and there is no possibility of erroneous erasing.

In addition, specifying the erasing range is easy because all you have to do is move the spot light source that corresponds to the erasing range of the document.Moreover, since you can specify the erasing range while looking at the front side of the original image, it is possible to This has the advantage that the erasing range does not shift.

In the above embodiment, the erasing array was arranged between the charger and the exposure section, but the arrangement is not limited to this, and as shown in FIG. It is also possible to implement a configuration in which the formed electrostatic latent image is erased according to a designation.

Further, the present invention is not limited to electrostatic copying, but can also be applied to thermal copying, thermal transfer copying, etc.

[Effect of the invention] As detailed above, according to the present invention, there is no procedural error,
With a simple operation while keeping the front side of the original facing up, you can create an image by specifying the image forming area of the original image or by erasing unnecessary parts, making it extremely convenient for editing original images, etc. A forming device can be provided.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is an external perspective view, FIG. 2 is a side sectional view, FIG. 3 is a side sectional view showing the configuration of an automatic document feeder, and FIG. 4 is a spot view. 5 is a perspective view showing the driving rib structure of the spot light source, FIG. 6 is a plan view showing the operation panel of the automatic document feeder, and FIGS. 7 and 8 are spot lights. FIGS. 9, 12, and 13 are diagrams for explaining the moving state of the light source, and FIGS.
Figure 0 is a diagram for explaining the erase range designation operation, Figure 11 is a diagonal diagram for explaining an example of memory storage, Figure 17 is a perspective view schematically showing the drive mechanism of the optical system, and Figure 17 is a diagram for driving the pointer. Fig. 18 is a block diagram showing the overall control circuit, Fig. 19 is a block diagram showing the control circuit of the automatic document feeder, and Fig. 20 shows the arrangement of the erasing array. 21 and 22 are side sectional views of the main parts, and FIG. 23(a) is a diagram for explaining the relationship between the erasing array and the photosensitive drum.
b) is a diagram showing the configuration of the erasing array, FIG. 24 is a circuit configuration diagram showing the configuration of the array driving section, and FIG. 25 is a side sectional view of the main part showing another example of the arrangement of the erasing array. 2... Original table, 10... Photosensitive drum, 60...
Self-help document feeding device, 61...Paper feeder, 62...Transport unit, A...Document, 73...Document receiver unit, 74.74
...Take-in roller pair, 75.80...Guide, 76
... Endless belt, 81.81 ... Paper ejection roller pair, 8
3.84...Detector, 86...Spot light source, 87
... Light emitting element, 88 ... Lens, 89 ... Fixed scale, 93 +' 98 ... Pulse motor, 101
...Main processor group, 106...Memory, 11
4... Interface, 120... Control circuit, 1
21...Control unit, 122°123.124...Driver, 150...Erasing array, 152...[Element,
160...Array drive unit. Applicant's Representative Patent Attorney Takehiko Suzue 1st Cause Figure 4 Figure 5 Figure 6' Figure 7 (a) Figure 10 Figure 11 Figure 19 Figure 20 Figure 25 H Figure 21 Figure 22

Claims (6)

[Claims] (1) In an image forming apparatus having a transfer means for optically scanning a document image supplied from a document feeder and placed on a document table, and transferring an image corresponding to the document image to a transfer material, the document a document receiving section provided on the front surface of the feeding device and having a translucent member that substantially coincides with the document table; a scale provided on the document receiving section; and a scale provided on the back surface of the translucent member and having the translucent member. a designating means for designating an image forming range of a front side original set on the front side of a member with reference to the scale; and a conveying means for inverting and conveying the original onto the document table after the designation by the specifying means. , further comprising an erasing means provided in the transfer means to prevent formation of an image corresponding to an image forming range designated by the designation means when forming an image on the document transported by the transport means. image forming device. (2) The image forming apparatus according to claim 1, wherein the light-transmitting member is transparent glass. (3) The image forming apparatus according to claim 1, wherein the specifying means comprises a spot light source and a moving means for moving the spot light source. (4) The transfer means comprises a photoreceptor drum, and the erasing means comprises a plurality of light emitting elements arranged near the photoreceptor drum in a direction orthogonal to the rotational direction of the drum. The image forming apparatus according to scope 1. (5) The image forming apparatus according to claim 4, wherein the plurality of light emitting elements are arranged between a charging section and an exposure section of the photoreceptor drum. (6) The image forming apparatus according to claim 4, wherein the plurality of light emitting elements are arranged between an exposure section and a development section of the photoreceptor drum.