JPS61112172A - Image forming device - Google Patents

Abstract

PURPOSE:To easily specify an erasure range and to perform erasure by indicating a specific range on an original with transmitted light with its scanned surface up, and discharging electrostatically a part corresponding to the indicated range while the original is scanned with the scanned surface down. CONSTITUTION:The original set on an original platen 2 is scanned by an optical system which uses an exposure lamp 4, and a reflected light image from the original is guided to a photosensitive drum 10 and formed on the surface of the drum 10, thereby forming a charge pattern. A spot light source 131 as a means which indicates the erasure range of the original is provided movably onto the guide shaft 230 of a carriage 411 which moves forth and back the optical system. The original is placed on an original platen 2 with its scanned surface up, and the transmitted light from the light source 1313 is used to specify the erasure range, whose indicated coordinates are stored. Then, the original is scanned with the scanned surface down and charges at the part on the surface of the drum 10 corresponding to the indicated range are erased by an erasing array 15 provided between the electrostatic charger 11 and exposure part Ph of the drum 10.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an image forming apparatus to which, for example, electronic copying aK is applied.

[Technical background of the invention and its problems]

In general, an electronic copying machine has the function of copying an original image onto paper as is, or enlarging or reducing the original image and making a copy.

By the way, there may be unnecessary parts in the original image. However, conventional copying machines cannot selectively erase and copy original images.

[Purpose of the invention]

The present invention has been made based on the above circumstances, and an object thereof is to provide an image forming apparatus that can form an image by erasing any part of a document image with a simple configuration. It is something to do.

[Summary of the invention]

This invention, for example, irradiates a spot light onto a document image, moves this spotlight to designate an erasing range, and irradiates a photosensitive drum with light corresponding to the designated erasing range to erase an electrostatic latent image. It is a device that erases static electricity and forms an image.
In particular, when specifying the erasing range, set the original on the original table with the copy side facing up, and then, when copying, make sure to turn the original over.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 13 and 14 schematically show an image forming apparatus, such as a copying machine, according to the present invention. That is, 1 is a main body of a copying machine, and a document table (transparent glass) 2 is fixed to the upper surface of the main body 1 to support a document. A document cover 11 and a work table 12, which can be opened and closed, are provided near the document table. The original set on the original platen 2 is exposed to an exposure lamp 4 and mirrors 5, 6 .
7! An optical system 3 consisting of
In addition to reciprocating in the direction K, the exposure position is made during the reciprocation. In this case, mirror 6.7 moves at a speed of 172 of mirror 5 so as to keep the optical path length constant. The light reflected from the original by the scanning of the above optical system,
The light reflected from the document by the light irradiation of the BM light lamp 4 is reflected by the mirrors 5, 6.7, passes through the variable magnification lens block 8, is further reflected by the mirror 9, and is guided to the photoreceptor drum 10. , an image of the original is formed on the surface of the photosensitive drum 10.

The photosensitive drum 10 rotates in the direction of arrow C, and its surface is first charged by the charger 11, and then the image of the document is exposed to slit light to form an electrostatic latent image. is made into a visible image by adhering toner to the 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 15 or 16 n1 paper guide path 1
7 or 18, and is guided to a pair of registration rollers 19, and sent to a transfer section by this pair of rollers 19. Here, each of the paper feed force sectors 13 and 14 is removably provided at the lower right end of the main body 1, and is provided with a button so that one of the four sections (operation) to be described later can be selected. Note that each of the paper feed cassettes 13. Y
4 is each cassette size detection switch 601.60
．． The cassette size is detected by The detection switches 601 and 602 are composed of a plurality of microswitches that are turned on and off depending on the insertion of cassettes of different sizes.

On the other hand, 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 photosensitive drum 10 is transferred by the action of the charger 20. The transferred paper P is peeled off from the photosensitive drum IO by the action of the peeling charger 21, conveyed on the conveyor belt 22, and sent to a pair of fixing rollers 23 as a fixing device provided at the terminal end of the conveyor belt 22. passing through K
The transferred image is fixed. Then, the paper P after fixing is
A pair of paper ejection rollers 24 ejects the paper onto a tray 25 outside the main body l. Further, after the photosensitive drum 10 after transfer is charged, the residual toner on the surface is removed by the cleaner 27 after the static electricity is removed by the charger 26, and the remaining toner is removed by the electricity removal lamp 28 so that the drum returns to its initial state. It has become. Note that 29 is a cooling fan for preventing the temperature inside the main body 1 from rising.

FIG. 15 shows the operation channel 30 provided on the main body 1. 301 is a copy key for instructing the start of copying;
0! 30s is a numeric keypad for setting the number of copies, etc., 30s is a display unit that displays the operating status of each part and paper jams, etc.
04 is a cassette selection key for selecting the upper and lower paper feed cassettes 13 and 14, 305 is a cassette display section for displaying the selected cassette, and 306 is a 1 magnification setting key for setting the copy enlargement and reduction magnification in a predetermined relationship. , 30te is a zoom key for steplessly setting the enlargement/reduction magnification, 30hata is a display section that displays the set magnification, 30. 30a, 30b, 30c, and 30d are operation keys for moving a spot light fA indicating the erase position of the document, which will be described later. 30e is a position for inputting the coordinate position indicated by the straight light source. The designation keys 30f and 30g are erasure range designation keys for designating the erasure range at a designated position, respectively.

FIG. 16 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 changing the magnification. Reference numeral 32 denotes a mirror motor, which is a motor for changing the distance (optical path length) between the mirror 5 and the mirror 6°7 for performing magnification change.
Reference numeral 3 denotes a traveling motor, which connects the exposure lamp 4 and the mirror 5.
, a motor for moving the mirror 6.7 for document scanning. 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. A developing motor 35 is a motor for driving the developing roller of the developing device 12 and the like. Reference numeral 36 denotes a drum seventh motor, which is a motor for driving the photosensitive drum IQ. 37 is a fixing motor;
This is a motor for driving the paper conveyance path 22, the pair of fixing rows 23, and the pair of paper discharge rows 7 and 24.

Reference numeral 38 denotes a paper feed motor, which is a motor for driving the feed rollers 15 and 16. 39 is a paper feed motor;
This is a motor for driving the registration roller pair 19. A fan motor 40 is a motor for driving the cooling fan 29.

FIG. 17 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 41, and the mirror 6.7 is placed in the second carriage 41.
These carriages 41, . 412 is a guide rail 42. ．． It is guided by 42□ and can freely move in parallel in the direction of arrow a. That is, the four-phase pulse motor 33 drives the pulley 43. An endless belt 45 is stretched between the boo 943 and the idle pulley 44, and one end of the first carriage 4, which supports the mirror 5, is fixed to the middle of the belt 45. On the other hand, a second carriage 41.7 supporting the mirror 6.7. The guide part 46 of the rail 42□ has the rail 42
Two near holes 47, 47 are rotatably provided apart from each other in the axial direction of t, and these boots 47, 47F
A wire 48 is stretched between them. 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. Also,
One end of the first carriage 41□ is fixed to a midway portion of the wire 48. Therefore, as the pulse motor 33 rotates, the belt 45 rotates and the first carriage 411 moves, and accordingly, the second carriage 411 moves.
12 also moves. At this time, since the pulleys 47, 47 serve as movable pulleys, the first carriage 41. against the second
The carriage 412 moves in the same direction at 1/2 speed. In addition, the 11th second carriage 41□, 41. The moving direction of the pulse motor 33 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. That is, paper selection key 30. Let the paper size specified by (Px, Py) be the magnification setting key 306.

If the copying magnification specified by 30 is K, the copyable range (x*y) is xmPx/Ky-Py/K. Of this copyable range (x, y), the X direction is indicated by nine pointers 51 and 52 provided on the back surface of the document table 2, and the y direction is indicated by nine pointers 51 and 52 provided on the upper surface of the first carriage 41. As shown in FIG. 18, the above-mentioned pointer El indicated by 53 and 52 are provided on a wire 57 which is suspended between pulleys 54 and 55 via a spring 56.

The pulley 55 is rotated by a motor 58, and the rotation of the motor 58 adjusts the paper size and magnification (by being driven accordingly, the pointers 51, 52
K so that the distance between them can be changed.

In addition, the first carriage 41. is moved to a predetermined position (home position according to the magnification) by driving a motor 33 according to the paper size and magnification. Then, when the copy key 301 is pressed, the first
The carriage 41 is first moved toward the second carriage 412, and then the lamp 4 is turned on and the second carriage 41! is moved in the direction away from.

When the original set meal is completed, the lamp 4 is turned off and the first
The carriage of 1 m is returned to the home position.

! ! Figure 19 shows the overall control circuit, which includes the main processor group 7 and the first and second sub-processor groups 72.7.
It is mainly composed of 3. The above main processor group 71
includes the operation panel 30 and various switches and sensors, such as the cassette size detection switch 601, 60. A high-voltage transformer 76 that detects input from an input device 75 such as and drives the various chargers, the static elimination lamp 28, the blade solenoid 27a1 of the cleaner 22, the fixing device,
The heater 23a1 of the a-ra pair 23 controls the exposure lamp 4, each of the motors 30 to 40, 58, etc. to perform the copying operation described above, and also controls the switch light source 131, pulse motor 135, erase array 150, and array drive. Part 1
601 controls the memory 140 and the like to erase unnecessary portions of the document. Incidentally, a spot light source 13, a pulse motor 135, an erasing array 150, an array driving section 16
01 memorino 40 will be described later.

Among the above motors 31 to 40.58, motor 35.37
．． The toner motor 77 that supplies toner to the main processor group 7 through a motor driver 78 is operated by the main processor group 7 through a motor driver 78. The motors s6, 39 are controlled by the first setter group 22 via
38.58 is controlled by the second sub-processor group 73 via the pulse motor driver 80.

Further, the exposure rung 4 is controlled by the main processor group 71 via the lamp regulator 8I, and the heater 23m is controlled by the main processor group 71 via the heater control section 82. Then, the main processor group 71 to the eleventh second chip processor group 72 . For '13, drive each motor,
A stop command is sent to the first and second nap processor groups 72.
73 to the main processor group 7 to drive each motor,
A status indicating a stopped state is sent. Further, the first processor group 22 receives position information from a position detector 83 that detects the initial positions of the motors 31 to 34.

FIG. 20 shows an example of the configuration of the main processor group 71. That is, numeral 91 is a one-chip microcomputer (hereinafter simply referred to as microcomputer) which detects human input from keys on an operation panel (not shown) and performs various display controls through an input/output port 92. Furthermore, the microcomputer 91 is expanded with input/output ports 93-96. The input/output capo) 93KR high voltage transformer 76, motor driver 78.2, brake generator 81, and other outputs are connected to the input/output capo) 94. A size switch for detecting paper size and other human power are connected to the input/output port. A copy condition setting switch and other human power are connected to 9ξ. Note that the input/output port 96 is for optional input. FIG. 21 shows an example of the configuration of the first sub-processor $12. That is, 101 is a terminal connected to the main processor group 7. 102 is a programmable interval timer for controlling the phase switching interval time of the pulse motor, and it counts based on the set value set by the microcomputer 101;
When a count act is performed, an end pulse is output to the interrupt line of the microphone 101. A reference clock pulse is input to the timer 102. Further, the microcomputer 101 receives position information from the position sensor 83 and is connected to single output ports 103 and 104.The input/output port 104 is connected to the Nors motor driver. Via 79-T--931~34.1
35 are connected. In addition, the above human output Tate 103
is used for outputting status signals of each pulse motor to the main processor group 71, etc.

FIG. 22 shows an example of the configuration of the second sub-processor group 73. That is, No. 11 is a terminal connected to the main processor group 71. Reference numeral 112 is a programmable interval timer for controlling the phase switching interval time of the 14-channel smoke, and the set value is set from the microcomputer 111, and based on that, the programmable interval timer is used to control the phase switching interval time.
When the count is out, a termination pulse is output. This termination signal is latched by the latch circuit 113, and its output is supplied to the interrupt line of the microcomputer 111 and the input/output port input line.

Further, an input/output port 114 is connected to the microcomputer 111, and this input/output port 114Vc is connected to the motors 36.3B, 39 via the motor driver 80.
．． 58 are connected.

Fig. 23 shows the control circuit of the pulse motor.
04,114) K is the pulse motor driver 122
(Equivalent to pulse motor driver 19.80 in Figure 18)
is connected, and this pulse motor driver 12211CI
! pulse motor 123 (the pulse motor 31 to 34°3
6.38.39) each winding A, A, B.

B is connected.

Figure 24 shows the speed control method of a pulse motor.
(a) The figure shows the speed curve of a pulse motor! D, (b) shows the phase switching interval. As is clear from this figure, the phase switching intervals are long at first, gradually become shorter, then become equal intervals, gradually become longer again, and then stop. That is,
This indicates the through-up and through-down of the pulse motor, which starts from the self-starting region, starts up, is used in the high-speed region, and then eventually falls down. In addition,! l+t! ...
tx indicates the phase switching interval time.Next, the main parts of the present invention will be explained.In FIGS. A guide shaft 130 is provided along the guide shaft 130, and a switch light source 131 is movably provided on the guide shaft 130 as means for indicating the erasing range of the document. As shown in FIG. 2, the spot light source 13 includes a light emitting element 132 such as a light emitting diode or a lamp, and a lens 133, which are disposed opposite to the document table 2. is irradiated by the lens 133 onto the document table 2 as a spot light with a diameter d.
It has become. This spot light has a brightness that allows it to pass through the original Gi set on the original platen 2, for example, the thickness of a postcard.

Further, the spot light source 131 is connected to a timing belt (belt with fil) 134 disposed along the guide shaft 130.
is connected to. This timing belt 134 is passed between a pulley 136 provided on the rotating shaft of a Nockles motor 135 and a driven pulley 132. therefore,
By rotating the pulse motor 135, the slit light source 13 is moved in a direction perpendicular to the traveling direction of the f1gl carriage 411. Further, the first carriage 411 located at the end of the guide shaft 13 on the pulse motor 135 side is provided with a position sensor 138 consisting of a microswitch for detecting the initial position of the spot light source 131. When moved, the spot light source 131 first comes into contact with the position sensor 138 so that the initial position is detected.

Next, using FIGS. 3 and 4, the spot light source 131
This section explains how to specify the erasing range of a document using . When specifying this erasing range, the original G is set on the original table 2 with the copy side facing upward. Further, the spot light source 13 is moved by operating the aforementioned operation keys 30a to 30d. That is, the operation key 30b.

30d, the motor 33 is driven and the first caliper 41. Then, the spot light source 131 is moved in the travel direction (arrow y direction shown in FIG. 3). In addition, the operation key 30
When a or 30c is pressed, the motor 135 is driven, and the spot light source 131 is moved in a direction perpendicular to the traveling direction (in the direction of arrow X shown in FIG. 3). The operator operates the operation keys 3oa to 30d while visually observing the spot light transmitted through the document G, and presses the position designation key 30ef, for example, with the spotlight moved to the 81 point on the document G shown in FIG. 4 (al K). .Then, the coordinate position specified by this Sl is displayed in the memo!J(
(RAM) 140. Similarly, 8 on manuscript G
With the spotlight moved to two points, press the position specification key 30e.
When is pressed, the position of the Sl point is stored in the memory z4oVc. The position of this spot light is, for example,
It can be detected by counting the number of drive pulses of 3.135.

After that, when the erasure range specification key 30f is pressed,
l As shown in K (S,, S, a rectangular area (indicated by diagonal lines) with diagonal points is designated as the erasing range. Also,
As shown in FIG. 4(b), by specifying the 88th point and the S3 point on the original G and pressing the erasure range designation key 30gf, the area other than the square with the 8m+84 point as the diagonal point is designated as the erasure range.

After specifying the erasing range, the document G on the document table 2 is turned over in the X direction along the fixed scale 21, as shown in FIG. Therefore, although the positional information in the X direction changes depending on whether it is specified or copied, the positional information in the y direction does not change.

On the other hand, as shown in FIG. 6, an erasing array 150 serving as erasing means is provided close to the photosensitive drum 10, for example, between the charger 1 and the exposure section Ph. This erase array 1
50, as shown in FIGS. 7 and 8, a plurality of light-shielding cells 15 are arranged in a direction perpendicular to the rotational direction of the photoreceptor drum 10, and inside each of these cells 15, as shown in FIG. (
As shown in al t (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 the number of light shielding cells 151.
If the width is t-P and the number is t-N, then the erase array 15
The total length of 0 is Q=NXP. Here, the light shielding cell 15
The width P of the erase array 1 is approximately equal to the diameter d of the spot light, and the X-direction resolution of the spot light and the erasing array 1
50 resolutions are matched.

The erase array iso is driven by the array driver 160 described above. As shown in FIG. 10, this array driving section 160 receives a lighting command signal supplied from a shift register 161 whose output is connected to each light emitting element 152 of the erase array 150 and a main processor group 71. each light emitting element 152 of the erase array 150 is turned on by
The transistor 162 supplies power to the transistor 162 and the bias resistor 163 of the transistor 162.

In the above configuration, the operation of erasing the original image will be explained using FIG.

First, when the power of the copying machine main body 1 is turned on, step S
1, the memory 140 is cleared, and in step S2, the first carriage 411 and the spot light source 131 are operated, and the first
Initial settings are performed, which include detecting the positions of the carriage 41m and the spot light source 131. Thereafter, in step S, the light emitting element 132 of the spot light source 131 is turned on, and in step 84, the set copy magnification and number of copies are read from the operation panel 30.

In this state, as shown in steps S to 8aK, it is sequentially determined whether or not the operation keys 30a to 30d have been operated.
Ru. As a result, when the operation key 30a is pressed in step 8 and it is determined that the object is round, control is shifted to step S.

In this step S, the spot light source 131 is moved in the +X direction (
It is determined whether or not it has been moved to the limit (direction away from the switch 138), and if it has been moved to the limit, control is transferred to steps S and a, which will be described later. Mana,
If the spot light source 131 has not been moved to the limit yet, the spot light source 131 is moved in the +X direction in step 81G, and then control is transferred to step 811, which will be described later.

On the other hand, in step S6, the operation key ? If it is determined that OC has been pressed, control is transferred to step 811. In this step S, the spot light source 131 is -X
The limit of direction (direction of approach to switch 138), i.e.
It is determined whether the switch 138 is turned on or not, and if the switch 138 is moved to the limit, the control proceeds to step S, which will be described later.
will be moved to If the spot light source 131 has not been moved to the limit yet, the spot light source 131 is moved in the -X direction in step 812, and then the control goes to step 81?, which will be described later. Further, in step S7, if it is determined that the operation key 30d has been pressed, the control is shifted to step 8ts. In this step 8111, it is determined whether the spot light source 13 has been moved to the limit in the -y direction (direction approaching the fixed scale 21),
If it has been moved to the limit, the control moves to step 8, which will be described later. If the first carriage 41° has not been moved to the limit yet, step 814 moves the first carriage 41° to -y.
direction, and then opening and opening is performed in step 8, which will be described later.
In addition, in step Sa, if the operation key sob is pressed and it is determined that it is a friend item, step SI! Then, it is determined whether the spot light source 131 has been moved to the limit in the 10y direction (direction away from the fixed school 2.),
If it has been moved to the limit, the control returns to step S1, which will be described later. will be moved to In addition, if the first caliper 41. is not moved to the limit yet, in step S16. ga+
It is moved in the y force direction.

As described above, when the first carriage 411 and the spot light source 131 are moved, the position information of the spot light source 131 is changed in step 81? The data are sequentially supplied to the memory 140 and stored therein. This memory 140 is divided into, for example, a first storage area and a second storage area, and the position information is sequentially written into the first storage area. Therefore, the contents of this first storage area are updated sequentially. Next, in one step StS, position designation key 30e is pressed.
It is determined whether or not the button has been pressed, and if it has not been pressed, control proceeds to step 8. If the button is pressed, the latest one of the positional information stored in the first storage area of the memory 140 is stored in the second storage area of the memory 140 at step 88°. y), and control then moves to step 819. Step S1・+8! With +, erase range specification key 30
It is determined whether or not g and 30f have been pressed. As a result,
If no n keys have been pressed, control is transferred from step Stt to step 812. This step St
The normal copying operation described above is performed in X to Sta. That is, in step 8tt, it is determined whether or not the copy key 301 has been pressed, and if it has not been pressed, the process proceeds to step 84.
Control is transferred to

Further, if the copy key 301 is pressed, step S!
, the first carriage 41. is moved to the scanning start position,
At step Sta, the exposure lamp 4 is turned on, and
The photosensitive drum 10 and the like are driven to start scanning. And step 8m! In Step 1, it is determined whether or not the scanning has been completed. If it has been completed, it is determined in step 8111 whether or not the copying of all the copies has been completed, and if there are still remaining copies, the Control is transferred to step 82m, and if all have been completed, control is transferred to step 84.

On the other hand, step 8. If the erasure range specification key SOt is turned on in step St? Copy key 30. It is determined whether or not is pressed. As a result, if the copy key 301 is pressed, the position information stored in the second storage area of the memory 140 is converted into actual position information based on the copy magnification in step Sta.

That is, the length of the document table 2 in the X direction is lx, and the copy magnification is 1.
Assuming that the specified position information in the X direction is X and the document is set at the center of the X direction along the fixed scale 21, the actual position information converted. Furthermore, there is no need to convert the position information in the X direction. However, since there is a distance of 1 d between the erasing array 150 and the exposure section ph, by multiplying this distance by the copying magnification of jaK to obtain JdXK, it is possible to accurately control the lighting of the erasing array 150.

In this way, after the location information is converted into real values,
In step StS, the first carriage 4C is moved to the scanning start position. Furthermore, in step S3.degree., the lighting data of the erase array 150 is supplied to the shift register 161. That is, in the main processor group 7, first, of the converted position information, a portion corresponding to one side of the rectangle indicated by the two position information in the X direction is converted into the Heylepel signal 1.
1", and the other part is a low level signal "0". Next, this generated data D
, is turned over and placed on the L8B side and Mf9 to align with the 9th manuscript.
The positions of all the data are swapped so that the B side is reversed, and this data D is transferred by the clock signal CLKK to the shift register 161 of the array drive section 160 shown in FIG. In this state, in step 831, the exposure switch 4 is turned on, the photosensitive drum 10, etc. are driven, and scanning is started. Then, in step SSt, it is determined whether the moving position of the first carriage 41 is the erase start position or not based on the converted X-direction position information, and if it is the erase start position, then in step SSS the erase array 1
50 is lit. That is, a lighting command signal is sent to the transistor 162 shown in FIG. is supplied, transistor 162 is turned on and power is supplied to erase array 150. Therefore, the light emitting element 152 corresponding to the portion where the data of the shift register 161 is set as a Heilepel
is lit, and the corresponding portion of the photoreceptor drum 10 is neutralized. Therefore, even if exposed to light, an electrostatic latent image is not formed in the portion from which the charge has been removed, and the original image is erased.

Thereafter, in step 834, it is determined whether the moving position of the first carriage 411 is the erase stop position or not based on the converted X-direction position information, and if it is the erase stop position, the erase array 150 is moved in step SSM. The lights are turned off. That is, the lighting command signal D0 to the transistor 162 shown in FIG. 10 is stopped, the transistor 162 is turned off, and the supply of power to the erase array 150 is stopped.

Next, in step SSa, it is determined whether or not the first carriage 41 has moved to a predetermined travel range, and if it has moved, it is determined in step SSt whether or not the number of copies set has been completed. be done. As a result, if there are still remaining sheets, the control is transferred to step SSa, and the first cartridge 4
1K to the scanning start position, the step 811
1, and the above-described operations are repeated. Further, when the set number of copies have been completed, control is transferred to step 718.

In this way, as shown in FIG. 4(a)K, it is possible to form an image in which the diagonally shaded portion of the document G has been erased.

On the other hand, if it is determined in step S1 that the erasure range specification key 30g has been pressed, step SSS
Copy key 30. It is determined whether or not is pressed. As a result, copy key 30. If is pressed, step S4
At step 81. Similarly, the position information stored in the second storage area of the memory 140 is converted to actual position information based on the copy magnification. After that, in step 841, the first carriage 411 is moved to the scanning start position, and in step 842, data Dl consisting of all @1'' is generated, and this data D1 is transferred to the array drive unit 16 shown in FIG.
0 to the shift register 161 by the clock signal CLK. Next, in step 84m, the exposure lamp 4 is turned on, the photosensitive drum 10, etc. are driven, and scanning is started. At the same time, at one step of 84 degrees, a lighting command signal is sent to the transistor 162 of the array drive section 160 shown in FIG. is supplied, and this transistor 162 is turned on. Therefore, power is supplied to the erasing array 150, all the light emitting elements 152 of the erasing array 150 are turned on, and the corresponding portions of the photoreceptor drum 10 are neutralized. Therefore, even if exposed to light, an electrostatic latent image will not be formed on the part where the static electricity has been removed.
First, the original image is erased.

Thereafter, in step S4g, it is determined whether the moving position of the first carriage 41° is the erase stop position or not based on the converted X-direction position information, and if it is the erase stop position, the array is driven in step S46. Erasing data is supplied to the shift register 161 of the section 160. That is, in the main processor group 21, first, among the converted position information, the part corresponding to one side of the rectangle indicated by the two position information in the X direction is set to a low level signal "0", and the other parts are set to a high level signal. Data DI consisting of a signal "1" is generated. Next, in order to align this generated data D with the reversed original, the positions of all data are swapped so that the LSB side and M2R side are reversed, and this data D1 is the 10th
The data is transferred to the shift register 161 of the array driving section 160 shown in the figure by the clock signal CLK. therefore,
The light emitting element 152 corresponding to the portion where the data of the shift register 16 is at a low level is turned off, and the photosensitive drum 10 corresponding to this portion is held in a charged state, so that An electrostatic latent image is formed to form a document image. Then, in step 847, it is determined whether the movement position of the first carriage 4 is the erase stop position or not based on the converted X-direction position information, and if it is the erase start position, the shift register is moved again in step 8411. All "1" data is set in 161, and the image is erased. After this, in step 8411, the first
It is determined whether or not the carriage 4 has moved to a predetermined travel range, and if it has moved, step S is entered. It is determined whether or not copying has been completed for the set number of copies. As a result, if there are still remaining sheets, control is transferred to step Ss1, and after moving the fig carriage 411 to the scanning start position, control is transferred to step 843, and the nine operations described above are repeated. However, if the set number of copies have been completed, control is transferred from step 850 to step 8.
Eraser array 150 is turned off. That is, the lighting command signal D
0 is stopped n1 transistor 16 of array driver 160
2 or off. After this, control is transferred to step S4. In this way, as shown in FIG. 4(b), it is possible to form an image in which the diagonally shaded portions of the document G are erased.

According to the above embodiment, it is possible to specify and erase unnecessary portions of a document, which is convenient for editing a copy image.

In addition, when specifying the erasure range, you can place a copy of the original as a front on the document table 2 and specify it while visually viewing the original using a spot light that passes through the original, making the specification operation easy. It is easy to confirm the erased range.

Furthermore, the first carriage 41. Since the spot light source 131 is provided in the front panel, space can be used effectively and it is possible to suppress the increase in size of the device.

Note that this invention is not limited to the above embodiments.

For example, the arrangement position of the erasing array 150 is not limited to between the charger 11 and the exposure section ph as shown in FIG. 6, but also between the non-light section Ph and the developing device 12 as shown in FIG. It is also possible to configure the electrostatic latent image that has been formed to be erased according to a designation.

Furthermore, the capacity of the memory 140 can also be changed as required.

It goes without saying that various other modifications can be made without departing from the gist of the present invention. [Effects of the Invention] As described above, according to the present invention, arbitrary portions of a document image can be It is possible to provide an image forming apparatus that can erase and form an image.

[Brief explanation of the drawing]

1 to 11 show an embodiment of the main part of an image forming apparatus according to the present invention, FIG. 1 is a perspective view of the main part showing a spot light source, and FIG. 2 is a perspective view of the main part showing a spot light source. The side cross-sectional view of the main part shown in FIG. 3, and FIG. 6 is a side sectional view of the main parts showing the arrangement of the erasing array, and FIGS. 7 and 8 show the relationship between the erasing array and the photosensitive drum, respectively. , Fig. 7 is a perspective view showing only the main parts, Fig. 8 is a front view showing only the main parts, Fig. WJ9 shows the configuration of the erasure array, and Fig. 7 (a) is a side sectional view, Figure (b) is a partially cutaway front view of the first
0 is a circuit configuration diagram showing the configuration of the array drive section, FIG. 11 is a flowchart shown to explain the original erasing operation, and FIG. 12 is a side sectional view of the main part showing another example of the arrangement of the erasing array. fJX 13 and 14 show the configuration of the image forming apparatus, and FIG. 13 is an overview perspective view 1. FIG. 14 is a side sectional view, FIG. 15 is a plan view showing the configuration of the operation panel,
FIG. 16 is a perspective view showing the configuration of the drive section, FIG. 17 is a perspective view schematically showing the drive mechanism of the optical system, FIG. 18 is a perspective view schematically showing the pointer drive mechanism, and FIG. 20 is a configuration diagram showing the overall control circuit, FIG. 20 is a configuration diagram of the main processor group, FIG. 21 is a configuration diagram of the first sub-processor group, FIG. 22 is a configuration diagram of the second nap processor group, and FIG. The figure is a schematic configuration diagram showing a control circuit of a pulse motor, and the 24th factor is a diagram for explaining a speed control method of a pulse motor. 1...Main body, 2...Original table, P...Paper, 10.
...Photoconductor drum, 30a-30d...operation keys,
30e...Position specification key, 30f, 30g...Erase range specification key, 33...Scanning motor, 41K...
1st key □ Yaritsuji, 71... Main processor group, 131... Spot light source, 132... Light emitting element,
133...shi/zu, 135...noyarus motor, 1
5o... Erasing array, 152... Light emitting element, 153
...Lens, 160...Array drive unit, 14o...
·memory. Applicant's agent Patent attorney Takehiko Suzue Figure 2 d Figure 3 Figure 4 (a) Figure 4 (b) Figure 85 Figure 611 Figure 7 15Q Figure 8 Figure 9 (a) (b) Figure 10 Figure 11 Figure 11 Figure 11 Figure 11 Figure 11 Figure 20 Figure 21 Figure 22 Figure 24 Procedural amendment o59-12, 18B

Claims (1)

[Scope of Claims] 1) A document placed on the document table is optically scanned by a scanning means that moves along the document table, and a reflected light image from the document is transferred to an image carrier to which a charge is applied. In an image forming apparatus that forms an image by forming a charge pattern, and then develops this charge pattern, it is transferred and fixed onto a transfer material to form an image.
an instructing means for instructing a predetermined range on the scanned surface of the document on the document table with the surface to be scanned facing up; 1. An image forming apparatus comprising: erasing means for erasing charges in a portion corresponding to the area where the image is formed. 2) The indication means is provided in the scanning means, is movable in a direction perpendicular to the moving direction of the scanning means, and comprises a light emitting element and a lens that irradiates a spot light onto the document surface. The image forming apparatus according to item 1. 3) The erasing means includes calculation means for making the range designated by the instruction means correspond to the position of the scanned document, and the calculation means disposed near the image carrier along the longitudinal direction of the image carrier. 2. The image forming apparatus according to claim 1, comprising a plurality of light emitting elements whose lighting is controlled by an output signal from the image forming apparatus. 4) The third aspect of the present invention is characterized in that the plurality of light emitting elements are arranged between a charging means and an exposing means for the photoreceptor.
The image forming apparatus described in . 5) The third aspect of the present invention is characterized in that the plurality of light emitting elements are disposed between an exposing means and a developing means of the photoreceptor.
The image forming apparatus described in .