JPS62129876A - Image forming device - Google Patents

Abstract

PURPOSE:To prevent the setting error of the deleting and extracting scope by an operator and to facilitate an image editing by shifting a spot light irradiated to an original picture, designating a deleting scope and irradiating the light from a deleting array to a photosensitive body drum corresponding to the designated deleting scope. CONSTITUTION:At the lower side of an original stand 2 of a main body 1 of an image forming device, an optical system shiftable scanning means by an exposing lamp 4 and mirrors 5-7 is provided. The spot light from the scanning means is reflected by a mirror 9, and the spot light is irradiated to a photosensitive drum 10. Between mirrors 7 and 9, a lens block 8 for variable is provided, an the block 8 is shifted by an operating key provided at the operating panel. By shifting the block 8, the deleting scope of a deleting array 150 provided corresponding to the drum 10 is specified. The image in the deleting scope is deleted by the light irradiation of the array 150 from the drum 10, and the block 8 is stopped at the position equal to the deleting pitch of the array 150.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an image forming method applied to, for example, an electronic copying machine.
Regarding the location.

(Technical Background of the Invention and Problems Therewith) Generally, electronic copying machines have 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. Therefore, recently, a system has been developed in which an erasing range is designated and images within or outside the erasing range are erased and copied.

However, when performing such erasing, the erasing range is specified using a spot light from a spot light source that is movably provided at the bottom of the document table, but the pitch of the spot light is 2 mm increments. In contrast, the erasure (extraction) pitch is 10 mm. For this reason, the stop position of the spotlight may be at the boundary of the erasing (extraction) pitch, and in this case, there is a possibility that an error in setting the erasing range by the spotlight may occur.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and an object thereof is to provide an image forming apparatus that can prevent an operator from making a mistake in setting the erasure extraction range and is useful for image editing, etc. It is in.

[Summary of the invention]

This invention, for example, irradiates a spotlight onto an original image, moves this spotlight to designate an erasing range, and irradiates light onto a photoreceptor drum by an erasing array in accordance with the designated erasing area. Copying is performed by erasing an electrostatic latent image or charge, and in particular, the spot light is always stopped at a position equal to the erasing pitch of the erasing means.

(Embodiment of the Invention) An embodiment of the invention will be described below with reference to the drawings.

FIGS. 5 and 6 schematically show an image forming apparatus of the present invention, such as a copying machine.

That is, 1 is a main body of a copying machine, and a document table (transparent glass) 12 for supporting a document is fixed to the upper surface of the main body 1. The document table 2 is provided with a fixed scale 21 that serves as a reference for setting the document, and furthermore, a document cover 11 and a work table 12, which can be opened and closed, are provided near the document table 2.

The original placed on the original platen 2 is moved back and forth by an optical system consisting of an exposure lamp 4 and mirrors 5, 6, and 7 along the lower surface of the original platen 2 in the direction of arrow a. It is designed to be exposed and scanned. In this case, mirror 6.7 moves at half the speed of mirror 5 so as to maintain the optical exposure length. The light reflected from the original by the scanning of the optical system, that is, the light reflected from the original by the light irradiation of the exposure lamp 4, is reflected by the mirror 5, 6, 7, passes through the variable magnification lens block 8, and further The light is reflected by the mirror 9 and guided to the photoreceptor drum 1o, so that an image of the document is formed on the surface of the photoreceptor drum 1o.

The photosensitive drum 1o rotates in the direction of arrow C in the figure, and the surface is first charged by a charging device 11, and then an electrostatic latent image is formed on one surface by slit exposure of the image. This electrostatic latent image is made visible by adhering toner to it by a developing device 12 containing, for example, black toner.

On the other hand, the paper (material to be transferred) P is taken out one by one from the selected upper paper feed cassette 13 and lower paper feed cassette 14 by a delivery roller 15 or 16, passes through a paper guide path 17 or 18, and then passes through a registration roller pair. 19, and is removably provided at the lower right end of the pair of registration rollers 1, and either one can be selected on an operation panel to be described later. Note that each of the paper feed cassettes 13 and 14 has a cassette size detection switch 60.
! , 602, the cassette size is detected. This cassette size detection switch 601.602
is composed of a plurality of microswitches that are turned on and off according to the insertion of cassettes of different sizes.

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. . This transferred paper P is transferred to the peeling charger 2
1, the image is electrostatically peeled off from the photoreceptor drum 10 and conveyed by a conveyor belt 22, and is sent to a fixing roller 23 as a fixing device provided at the end of the conveyor belt 22, where the transferred image is transferred. It will be established. Then, paper P after fixing
is placed on a tray 25 outside the main body 1 by a pair of delivery rollers 24. After the photosensitive drum 10 has been transferred, the charge is removed by the charger 26, residual toner on the surface is removed by the cleaner 27, and afterimages are roughly erased by the charge removal lamp 28, so that the photoreceptor drum 10 returns to its initial state. It's starting to go back. Note that 29 is a cooling fan for preventing the temperature inside the main body 1 from rising.

FIG. 7 shows the operation panel 30 provided on the main body 1. 301 is a copy key for instructing the start of copying; 302
303 is a display unit that displays the operating status of each part and paper jams, etc.; 304 is a cassette selection key that selects the upper and lower paper feed cassettes 13 and 14; 305 is the selected cassette 30s is a magnification setting key for setting the magnification and reduction magnification of the copy in a predetermined relationship, 307 is a zoom key for steplessly setting the magnification and reduction magnification, and 30s is a display for displaying the set magnification. Part 30! 30a, 30b, and 30C130d are operation keys for moving a spot light source that instructs the erase position of the original, the range to move the original, and the destination, respectively, which will be described later. 30e is the coordinate indicated by the spot light source. position specification key to input the position,
30f and 3(l are erasing range designation keys for specifying erasing ranges at designated positions, respectively.

FIG. 8 shows an example of the drive source configuration of each drive unit 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. Reference numeral 32 denotes a mirror motor, which connects the mirrors 5 and 6 to change the magnification.
This is a motor for changing the distance (optical path length) between the two. A scanning motor 33 is a motor for moving the exposure lamp 4, the mirror 5, and the mirror 6.7 for trui scanning. 34 is a shutter motor, and a charger 11 for charging the photosensitive drum 10 during zooming.
Shutter (not shown) for adjusting the charging width by
This is a motor for moving the. A developing motor 35 is a motor for driving the developing roller of the developing device 12 and the like. 36 is a drum motor, which is a motor for driving the photosensitive drum 10. 37 is a fixing motor, which connects the paper transport path 20. Fixing roller pair 2
1 and a pair of paper ejection rollers 24. 38 is a paper feed motor, and the feed roller 141
This is a motor for driving 143. Reference numeral 39 denotes a paper feed motor, which is a motor for driving the registration roller pair 17. A fan motor 40 is a motor for driving the cooling fan 29.

FIG. 9 shows a drive mechanism for reciprocating the optical system. That is, the mirror 5 and the exposure lamp 4 are supported by a first carriage 411, and the mirror 6.7 is supported by a second carriage 422, and these carriages 411 and 412 are guided by guide rails 42r and 422 in the direction of arrow a. It can be moved in parallel. That is, the four-phase pulse motor 33 drives the pulley 43.

A timing belt (endless belt) 45 is stretched between the pulley 43 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. As described later, the timing belt 45 has round teeth.

On the other hand, on the guide portion 46 of the second carriage 422 that supports the mirror 6.7, two boobies 947.47 are rotatably provided spaced apart in the axial direction of the rail 422, and between these pulleys 47.47. 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 moving directions of the first and second carriages 411 and 412 are controlled by switching the rotational 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 (Px, Py) and the copy magnification specified by the magnification setting keys 306 and 307 is K, then the copyable range (x, y), rx-
Px/Kl.

rV=PV/Kl. This copyable range (X.

y), the X direction is indicated by the pointers 51 and 52 provided on the back surface of the document table 2, and the y direction is indicated by the scale 53 provided on the top surface of the first carriage 411. ing.

The above pointers 51 and 52 are connected to the pulley 5 as shown in FIG.
4.55, and is provided on a wire 57 that is suspended via a spring 56. The pulley 55 is connected to the motor 5
This motor 5
8 is rotated according to the paper size and magnification, so that the distance between the hands 51 and 52 can be changed.

Further, the first carriage 41 is moved to a predetermined position (home position according to the magnification) by driving the motor 33 according to the paper size and magnification. Then, when copy key 3Ch is pressed, the first
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.

FIG. 11 shows the overall control circuit, showing the main processor group 71 and the first . Second sub-processor group 72.
It is mainly composed of 73. Main processor group 7 above
Reference numeral 1 denotes a high-voltage transformer 76 that detects input from an operation panel 30 and input devices 75 such as various switches and sensors, such as the cassette size detection switches 601 and 602, and drives the various chargers, the static elimination lamp 28, and the cleaner. 27, the heater 23a1 of the fixing roller pair 23, the exposure lamp 4, and each of the motors 31-40.
131, pulse motor 135, memory 140, registers 141 to 143, erase array 150, array drive section 16
0, etc., to erase unnecessary parts of the document.

Among the above motors 31 to 40.58.135, motor 3
A toner motor 77 that supplies toner to 5, 37.40 and the developing device 12 is controlled by the main processor group 71 via a motor driver 78, and
35 are controlled by the first sub-processor group 72 via a pulse motor driver 79, and the motors 36, 39, 38 .
58 is controlled by the second sub-processor group 73 via the pulse motor driver 80. Further, the exposure lamp 4 is connected to the main processor group 71 via a lamp regulator 81.
The heater 23a is controlled by the main processor group 71 via the heater control section 82. Then, from the main processor group 71, the first. Second sub-processor group 72
．． Commands to drive and stop each motor are sent to the first .
A status signal indicating the drive/stop state of each motor is sent from the second sub-processor group 72, 73 to the main processor group 71. Further, the first sub-processor group 72 receives position information from a position sensor 83 that detects the initial positions of the motors 31 to 34.135.

FIG. 12 shows an example of the configuration of the main processor group 71. That is, 91 is a one-chip microcomputer (hereinafter simply referred to as microcomputer), which detects human input of keys on an operation panel (not shown) and controls various displays via an input/output board 92. Also, microcomputer 91
is expanded by input/output ports 93-96. The input/output boat 93 is connected to a high voltage transformer 76, a motor driver 78, a lamp regulator 81, its relaxation output, etc., and the input/output boat 94 is connected to a size switch for detecting paper size and other human power.
A copy condition setting switch and other human power are connected to the input/output boat 95. Note that the input/output port 96 is an option.

FIG. 13 shows an example of the configuration of the first sub-processor group 72. That is, 101 is a microcomputer, which is connected to the main processor group 71. 102 is a programmable interval timer for controlling the phase switching interval time of the pulse motor, and when a set value is set from the microcomputer 101, it counts based on it, and when it has counted out, it sends an end pulse to the interrupt line of the microcomputer 101. Output. A reference clock pulse is input to the timer 102. Furthermore, the microcomputer 101 receives position information from the position sensor 83 and is connected to input/output boats 103 and 104.

The input/output boat 104 is connected to the motors 31 to 34.135 via the seven pulse motor drivers. The input/output board 103 is used, for example, to output status signals of each pulse motor to the main processor group 71.

FIG. 14 shows the configuration of the second sub-processor group 73. That is, 111 is a microcomputer, which is connected to the main processor group 71.

112 is a programmable interval timer for controlling the phase switching interval time of the pulse motor;
By setting a set value from 1, it counts based on it, and outputs an end pulse when the count is out. This end pulse 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 boat 114 is connected to the microcomputer 111, and motors 36, 38, 39, and 58 are connected to the input/output boat 114 via the pulse motor driver 80.

Figure 15 shows the control circuit of the pulse motor.
The input/output boat 121 (corresponding to the input/output boats 104 and 114 in Figs. 13 and 14) has a pulse motor driver 1.
22 (corresponding to the pulse motor driver 79.80 in FIG. 11) is connected to the pulse motor driver 122,
．． 38.39.58.135) each winding A.

B, A, and B are connected.

Figure 16 shows a method of controlling the speed of a pulse motor, where (a) is the speed curve of the pulse motor, and (b) is the speed curve of the pulse motor.
The figure shows the phase switching interval. As is clear from this figure, the phase switching interval is initially long, gradually shortens, eventually becomes equal, becomes gradually longer again, and then stops. In other words, this shows the slew-up and slew-down of a pulse motor, and the beginning is spontaneous! It rises from the 11th region, is used in the high speed region, and then falls. In addition, tl,
t2...tx indicates the time of the phase switching interval.

Next, a document image erasing means, which is the gist of the present invention, will be explained. 17 and 18, the first carriage 411 is provided with a guide shaft 130 along the lamp 4 in a portion where the light of the lamp 4 is blocked.
At 30, a movable spotlight rA131 is provided as a means for indicating the erasing range of the original. As shown in FIG. 18, this spot light source 131 consists of a light emitting element 132, such as a light emitting diode or a lamp, and a lens 133, which are provided opposite to the document table 2. The light generated by the light emitting element 132 is transmitted through the lens. 133, the document table 2 is irradiated with a spot light having a diameter d. This spot light has a brightness that allows it to pass through the document G set on the document table 2, which is, for example, as thick as a postcard. Further, the spot light source 131 is connected to a timing belt (belt with lit) 134 disposed along the guide shaft 130.

This timing belt 134 is passed between a pulley 136 provided on the rotating shaft of a pulse motor 135 and a driven pulley 137. Therefore, the pulse motor 135
By rotating the spot light source 131, the spot light source 131 is moved in a direction perpendicular to the scanning direction of the first carriage 415. In addition, a spot light source 131 is mounted on the first carriage 411 located at the end of the guide shaft 130 on the pulse motor 135 side.
A position sensor 138 consisting of a microswitch is provided to detect the initial position of. For example, spot light source 13
1 is moved, the spot light 111131 first comes into contact with the position sensor 138 and the initial position is detected.

As shown in FIG. 1, the movement pitch of the spot light source 131 is, for example, 2 mm in each of the x and y directions.

Next, a method for specifying the erasing range of a document using the spot light source 131 will be explained using FIGS. 19 to 21. This spot light source 131 is activated by operating the light emitting element 132 by operating the operation keys 30a to 30d described above.
will be moved while the is lit. That is, the operation key 30
When b130d is pressed, the motor 33 is driven, and the first carriage 411 and spot light source 131 are moved in the scanning direction (arrow y direction shown in FIG. 19, that is, Vl).

y2 direction). In addition, the operation keys 30a, 30
When C is pressed, the motor 135 is driven and the spot light source 1
31 is moved in a direction perpendicular to the scanning direction (direction of arrow X shown in FIG. 19, that is, direction of arrow Xl and X2). The operator operates the operation keys 308 to 30d while visually observing the spot light transmitted through the document G, and presses the position designation key 30e after moving the spot light to point S1 on the original fiG shown in FIG. 20(a), for example. Press. Then, the coordinate position specified by this Sl is stored in the main processor group 71 shown in FIG. Similarly, when the position designation key 30e is pressed with the spotlight moved to 82 points on the document G, the positions of the 82 points are stored in the main processor group 71. The position of this spot light can be detected, for example, by counting the number of drive pulses of the pulse motor 33.135. After this, press the erase □ range specification key 30f, as shown in Fig. 20 (
As shown in a), a rectangular area (indicated by diagonal lines) with 82 diagonal points Ss is designated as the erasure range. In addition, as shown in FIG. 20(b), 83 points and 84 points of original G
Specify the point ゛ and press the erase range specification key 30C1.
3. The area other than the square with the 84 points as diagonal points is designated as the erasing range. In this way, the erasure range specification key 30
When f and 30Q are pressed, the main processor group 71 performs calculations based on the specified two point positions and the copying magnification, and the memory 140 stores a high level signal ``1'' in the erasing range area and a high level signal ``1'' in the other areas. In other words, in this memory 140, the capacity in each column direction is calculated by dividing the moving distance of the spot light source 131 in the X direction, for example.
It is constituted by a RAM whose position resolution in the y-force direction is almost matched, and by the data supplied from the main processor group 71, in the case of FIG. 20(a), as shown in FIG. 21(a>), In addition, in the case of FIG. 20(b), as shown in FIG. 21(b), a high level signal is stored in the address corresponding to the shaded area, and a low level signal is stored in the other addresses. This memory 1
The resolution of 40 corresponds to the erase pitch of erase array 150 (eg, 10 mm).

In this case, the original is set with the copy side facing up, and after the erasure range is specified, it is turned over along the fixed scale 21 of the original table 2. Therefore, as shown in FIG. 21, the information stored in the memory 140 is also actually stored inverted in the column direction.

On the other hand, as shown in FIG. 22, an erasing array 150 serving as erasing means is provided close to the photosensitive drum 10, for example, between the charger 11 and the exposure section Ph. As shown in FIGS. 23 and 24, this erasing array 150 includes a plurality of light shielding cells 151 arranged at a pitch of, for example, 2 mm x 2 mm in a direction perpendicular to the rotational direction of the photoreceptor drum 10. Figure 25 (
A light emitting element 152 made of a light emitting diode, for example, as shown in a) and (b) is provided. In addition, each cell 15
A light emitting element 1 is provided in the opening facing the photosensitive drum 10 of 1.
A lens 1 that focuses 52 lights onto the surface of the photoreceptor drum 10
53 are provided. The number of light emitting elements arranged in this erasing array 150 matches, for example, the capacity of the memory 140 in the column direction. Here, if the distance between the light emitting elements 152 is P and the number is N, then the erasing array 150
The total length of is Q-NXP.

The erase array 150 is driven by the array driver 160 described above. As shown in FIG. 26, this array driving section 160 includes a shift register 161 having the same number of bits as the number of bits in the column direction of the memory 140, and a store register 1 in which the contents of this shift register 161 are held.
62, it is constituted by a switch circuit 164 consisting of a plurality of switch elements 163 that are controlled on and off by each output signal of this store register 162, the movable contacts 163a of these switch elements 163 are grounded, and the fixed contacts 163b are grounded. Each of the light emitting elements 152 constituting the erasing array 150 is connected to each cathode. The anodes of each of these light emitting elements 152 are connected to the power source CC through current limiting resistors R, respectively.

The erasure pitch at which each light emitting element 152 of the erasure array 150 is erased is, for example, 10 mm in the x and y directions, as shown in FIG.

After specifying the erase range of the original as described above, when the original cover 11 is closed and the copy key 301 is pressed, the first carriage 411 and the photosensitive drum 10 are operated, and the memory 140 is read in the row direction. One column of data is sequentially read out (as shown in FIG. 21). This read data D1 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 71 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 erase array 150 is arranged between the charger 11 and the exposure section Ph, one row of data output from the memory 140 is stored in the erase array 1, for example.
50 and the exposed part ph is θ1, and the photoreceptor drum 1
0 is rotating at each speed, the latch signal L is supplied to the store register 162 before θ1/ω.
The output timing of TH is controlled.

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 portions of the photoreceptor drum 10, the portion where the light emitting element 152 is turned on is neutralized, and even if this neutralized portion is subsequently exposed to light, will it still be a? Ii! This means that no latent image is formed and the original image has been erased. Thereafter, the data in the memory 140 is read out column by column in the same manner, and the image is erased.

Next, the gist of the invention will be explained. For example, as shown in FIG. 1, the movement pitch of the spot light source 131 (
x, y directions) at a pitch of 2 mm, and an erasure (extraction) pitch by the erasure array 150 (X.

y direction) is 10 mm. In this state,
Each area a, b, . Furthermore, the coordinates of the moving pitch of the spot light source 151 in the X direction are respectively "96, . . . , 112", and the coordinates of the moving pitch of the spot light source 151 in the y direction are "79, . . . , 91", respectively.

In this state, the reception operation of the operation keys 30a to 30d will be explained with reference to the flowchart shown in FIG. That is, the main processor group 71 first sets a flag indicating that the moving direction of the spot light source 131 is normal rotation in the y direction, and then checks whether the operation key 30b has been pressed.

If it is determined through this confirmation that the operation key 30b has been pressed, the main processor group 71 sets a flag indicating that the movement direction of the spot light source 131 is reversed to the X direction, and if it is determined that the operation key 30b has not been pressed. , confirms whether the operation key 30d has been pressed. Based on this confirmation, if it is determined that the operation key 30d has been pressed, and if a flag indicating that the movement direction is reversed in the X direction is set, the main processor group 71 sends a request to move the spot light source 131 in the 72. Further, if it is determined that the operation key 30d is not pressed, the main processor group 71 stores the current y-coordinate in the register 141.

The main processor group 71 is a spot light source 131.
A flag is set to indicate that the movement direction is normal rotation in the X direction, and then a check is made to see if the operation key 30a has been pressed. Based on this confirmation, if it is determined that the operation key 30a has been pressed,
The main processor group 71 sets a flag indicating that the moving direction of the spot light source 131 is reversed to the X direction, and when determining that the operation key 30a is not pressed, checks whether the operation key 30G is pressed. Based on this confirmation, if it is determined that the operation key 30C has been pressed, and if the movement direction is flagged to be reverse in the X direction, the main processor group 71 requests the movement of the spot light source 131 in the 72. Further, if it is determined that the operation key 30c is not pressed, the main processor group 71 stores the current X coordinate in the register 142.

Furthermore, the movement process of the spot light source 131 in response to the reception process of the operation keys 30a, . . . will be explained with reference to the flowcharts shown in FIGS. 3 and 4.

That is, when the operation key 30b is turned on when the spotlight from the spot light source 131 is at the center of the area C, that is, at the coordinates "82, 108", the motor 33 is driven in the forward direction by the sub-processor group 72, and the carriage 441
is moved, and the spot light from the spot light source 131 is moved along the coordinate "82" in the X direction in the y1 direction, that is, in the direction of area b. During this movement, the operation key 30b
Check whether the movement request is being supplied. When a movement request is supplied, the main processor group 71 stores data corresponding to the next movement amount (H-05>, that is, 5 steps) in the register 143. If the movement request is no longer supplied before reaching the center of point b, that is, if the input to the operation key 30b is released, the register 1 is
43 stores data corresponding to the next movement amount (H=OO), that is, O step. As a result, when the spot light corresponds to the coordinates "82.103", that is, the center of area b,
The next amount of movement, that is, the content of the register 143 becomes "0", and the motor stops at that position.

Furthermore, if the movement request is no longer supplied after the spot light passes the coordinate "82.103", that is, the center of area b, that is, if the input of the operation key 30b is released,
The register 143 has the next move 11 (H-00), that is, 0.
Store data corresponding to the step. As a result, when the spot light corresponds to the coordinate "82.98", that is, the center of area a, the next amount of movement, that is, the content of the register 143 becomes "0", and it stops at that position.

Further, when the spotlight is moved in the X direction, the same operation as above is performed, and the spotlight is stopped at the center of each area.

In the above flowchart, MV-1 is a movement request, MV-0 is a stop request, F/R-1 is a forward request, and F/R-1 is a movement request.
R-0 is a reverse request, H/L-1 is 400ppS 2-phase excitation, H/L-0 is 1001) pS 2-phase excitation, 5POT
BF is a movement amount buffer register (register 143),
5POINT is the current value (number of steps) of the carriage.

As mentioned above, when specifying the erasure/extraction range, the spot light by the spot light source is moved in accordance with the resolution of erasure/extraction, that is, in correspondence with the center of the area where erasure/extraction is possible. Therefore, when the operator sets the range, it can be displayed in correspondence with the position where deletion or extraction is actually performed, which prevents setting errors by the operator and is extremely convenient in practice.

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 that shown in FIG. 22, but as shown in FIG. It is also possible to configure the data to be erased accordingly.

〔Effect of the invention〕

As described in detail above, according to the present invention, it is possible to prevent an operator from making a mistake in setting the deletion or extraction range, and it is possible to provide an image forming apparatus useful for image editing and the like.

[Brief explanation of drawings]

1 to 26 show an embodiment of the present invention, and FIG. 1 is a diagram for explaining the relationship between the erasure and extraction pitch and the movement pitch of the spotlight, and FIGS. 2 to 4 Figure 5 shows a flowchart for explaining the main part of the operation.
6 is a side sectional view of FIG. 5, FIG. 7 is a plan view showing the structure of the operation panel, FIG. 8 is a perspective view showing the structure of the drive unit, and FIG. 9 is a perspective view of the image forming apparatus. The figure is a perspective view schematically showing the drive mechanism of the optical system, Fig. 10 is a perspective view schematically showing the drive mechanism of the pointer, Fig. 11 is a configuration diagram showing the overall control circuit, and Fig. 12 is the main A configuration diagram of the processor group, FIG. 13 is a configuration diagram of the first sub-processor group, FIG. 14 is a configuration diagram of the second sub-processor group, FIG. 15 is a schematic configuration diagram showing the control circuit of the pulse motor, and FIG. 16 17 is a perspective view of the main parts showing the spot light source, FIG. 18 is a side sectional view of the main parts showing the spot light source, and FIGS. 19 and 20 are diagrams for explaining the speed control method of the pulse motor. 21 is a plan view for explaining the operation of specifying the erasing range of a document using a spot light source, FIG. 21 is a diagram for explaining the contents of the memory, and FIG. 22 is a side view of the main part showing the arrangement of the erasing array. 23 is a cross-sectional view of only the main parts showing the relationship between the erasing array and the photosensitive drum, the 24th factor is a front view of FIG. 23, and FIG. 25(a) is a side cross-section showing the configuration of the erasing array. figure,
Figure (b) is a front view showing a part of the erasing array cut away;
FIG. 26 is a circuit diagram showing the configuration of the array driving section, and FIG. 27 is a side sectional view of the main parts showing an example of the arrangement of the erasing array in another embodiment. DESCRIPTION OF SYMBOLS 1...Main body, 2...Document stand, 10...Photosensitive drum, 12...Developer, 30-...Operation panel, 30
a to 30d... operation keys, 30e... position designation keys, 31... motors, 71... main processor group,
72...Sub-processor group 72.131...Spot light source, 132...Light emitting element, 133-...Lens, 135...Pulse motor, 140...Memory, 141-143...・Register, 150... Erase array, 152... Light emitting element, 153... Lens, 1
60...Array drive unit, P...Paper. Applicant's Representative Patent Attorney Takehiko Suzue Figure 2 Figure 3 Figure 4 Figure 14 Figure 15 Figure 19 Figure 20 (a) Figure 20 (b) (a) (b) Figure 21 Figure 22 Figure 27 Cause Figure 23 (a) (b)

Claims (3)

[Claims] (1) A scanning device that moves along a document table and optically scans the document placed on the document table, and an image carrier on which an image corresponding to the document image guided by the scanning device is formed. , an image forming apparatus comprising a supply means for supplying a transfer material corresponding to the document, and a transfer means for transferring an image formed on the image carrier to the supplied transfer material; an indicating means that is movably provided in the scanning means and irradiates a spotlight; an erasing range specifying means that specifies an erasing range by moving the indicating means; The present invention is characterized by comprising: erasing means for erasing images outside or within the range from the image carrier; and means for ensuring that the stop position of the indicating means is equal to the erasing pitch of the erasing means. image forming device. (2) A patent claim characterized in that the instruction means is movable in a direction of movement of the scanning means and a direction perpendicular to the direction of movement, and comprises a light emitting element and a lens that irradiates a spot light onto the surface of the document. The image forming apparatus according to item 1. (3) Image formation according to claim 1, wherein the erasing means comprises a plurality of light emitting elements arranged near the image carrier along the longitudinal direction of the image carrier. Device.