JPS62103672A - Image forming device - Google Patents

Abstract

PURPOSE:To make maintenance, inspection, etc. easy by attaching an erasing array to a charging charger which can be attached to and detached from a copying machine body and taking out the erasing array from the copying machine body together with the charging charger. CONSTITUTION:An erasing array 150 is attached to a charging charger 11 which can be attached to an detached from the copying machine body, and the erasing array 150 can be taken out from the copying machine body. Consequently, the erasing array 150 can be taken out easily from the copying machine body and be cleaned, maintained, and inspected when the erasing array 150 is dirtied by a developer or the like or light emitting diodes are damaged. Since the erasing array 150 is provided on a charging charger 11, a separate means which holds the erasing array 150 is made unnecessary to simplify the constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to an image forming apparatus applied to, for example, an electronic copying machine.

[Technical background of the invention and its problems]

2. Description of the Related Art Recently, copying machines have been developed that erase unnecessary portions of original images and copy them. For example, this copying machine is equipped with an erasing array consisting of a plurality of commercially available lens-equipped light emitting diodes near the photoreceptor drum, and the light emitting diodes of this erasing array are selectively turned on in accordance with the erasing range of a specified document. As a result, the image is erased by erasing the charge or electrostatic charge on the photoreceptor drum.

By the way, since the erasing array is provided near the photoreceptor drum, developer scattered from the photoreceptor drum or the developing device may adhere thereto and become dirty.

In this way, if the erasing array becomes dirty, the light emitted from the light emitting elements that make up the erasing array may no longer be irradiated onto the photoreceptor drum, or the light m necessary for erasing may no longer be obtained. This has the disadvantage that images cannot be erased reliably. However, since the conventional erasing array is fixed to the main body of the copying machine, it cannot be easily cleaned, and improvements in this respect have been desired.

[Purpose of the invention]

This invention was made based on the above circumstances,
The object of the present invention is to provide an image forming apparatus that is capable of cleaning dirt on an erasing means with a simple configuration and that facilitates maintenance and inspection.

[Summary of the Invention] According to the present invention, for example, an erasing array is attached to a charging device that is removable from the main body of a copying machine, and can be taken out from the main body of the copying machine together with the charging device.

[Embodiments of the invention]

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

FIGS. 3 and 4 schematically show an image forming apparatus of the present invention, such as a copying machine. A document table (transparent glass) 2 for supporting a document is fixed to the top surface of the copying machine 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 processed by an optical system consisting of an exposure lamp 4 and mirrors 5, 6, and 7.
Exposure scanning is performed by reciprocating in the direction of arrow a along the lower surface of document table 2. in this case,
Mirror 6.7 is 1/1 of mirror 5 to hold the light exposure.
It is moved at a speed of 2.

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 is further reflected by the mirror. 9 and guided to the photoreceptor drum 10, so that an image of the document is formed on the surface of the photoreceptor drum 10.

The photosensitive drum 10 is rotated in the direction of arrow C in the figure, and first, the surface thereof is charged by the charging device 11. Thereafter, the image is exposed to slit light to form an electrostatic latent image on the surface. This static image 1m111 is visualized by toner being applied by the developing device 12.

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 or the lower paper feed force rollers 1 to 14 by the delivery rollers 15 or 16, and the taken out paper is guided through the paper guide. It is guided through a path 17 or 18 to a pair of registration rollers 19, and guided to a transfer section by this pair of registration rollers 19.

Here, the paper feed cassettes 13 and 14 are removably provided at the lower right end of the main body 1, and one of them can be selected from an operation panel to be described later. The cassette size of each of the paper feed cassettes 13 and 14 is detected by cassette size detection switches 601 and 602, respectively. The cassette size detection switches 601 and 602 are 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 is brought into close contact with the surface of the photoreceptor drum 10 at the transfer charger 20, and
The toner image on the photoreceptor drum 10 is transferred by the action of 0. The transferred paper P is electrostatically peeled off from the photosensitive drum 10 by the action of a peeling charger 21, and is sent by a conveyor belt 22 to a fixing roller 23 as a fixing device provided at the end thereof. Then, by passing through this, the transfer portion is fixed, and the fixed paper P is discharged to a tray 25 outside the main body 1 by a pair of paper discharge rollers 24 . Further, the photoreceptor drum 10 after the transfer is transferred to a charger 2 for removing static electricity.
6, residual toner on the surface is removed by a cleaner 27, and afterimages are erased by a static elimination lamp 28, so that the initial state is restored. Note that 29 is a cooling fan for preventing the temperature inside the main body 1 from rising.

FIG. 5 shows an operation panel 30 provided on the main body 1. 301 is a copy key for instructing the start of copying; 302
is a numeric keypad for setting the number of copies, etc., 303 is a display unit that displays the operating status of each part and paper jams, etc., 304 is a cassette selection key for selecting the upper and lower paper feed cassettes 13 and 14, and 30s is a selected key. A cassette display section for displaying the cassette, 306 a magnification setting key for setting the enlargement and reduction magnification of copies in a predetermined relationship, 307 a zoom key for steplessly setting the enlargement and reduction magnification, and 30a for displaying the set magnification. A display section, 309 is a density setting section for setting the copy density, 30a, 30b, and 30C130d are operation keys for moving a spot light source that indicates the erasing position of the original, which will be described later, and 30e is a position designation for inputting the coordinate position indicated by the spot light source. Keys 30f and 30C1 are erase range designation keys for specifying erase ranges at designated positions, respectively.

FIG. 6 shows an example of the drive source configuration of 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. 32 is a mirror motor;
This 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. Reference numeral 34 denotes a shutter motor, which is a motor for moving a shutter (not shown) for adjusting the charging width of the photosensitive drum 10 by the charger 11 during transmission. 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. Reference numeral 37 denotes a fixing motor, which is a motor for driving the paper conveyance path 22, the pair of fixing rollers 23, and the pair of paper discharge rollers 24.

38 is a paper feed motor, and the feed roller 15, 16
This is a motor for driving. A paper feeding motor 39 is a motor for driving the registration roller pair 19. A fan motor 40 is a motor for driving the cooling fan 29.

FIG. 7 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 421 and 422 in the direction of arrow a It is said that it can move freely in parallel in the direction. Also, 4
The phase pulse motor 33 drives a pulley 43. One φ-free belt 45 is passed between this pulley 43 and fiddle pulley 44, and this belt 4
A first carriage 411 that supports the mirror 5 in the middle of the mirror 5
One end is fixed. - On the other hand, the guide part 46 of the second carriage 422 supporting the mirror 6.7 has a rail 4
Two pulleys 47.47 are rotatably provided apart from each other in the axial direction of the pulley 22, and a wire 48 is stretched between these pulleys 47.47. One end of this wire 48 is fixed to a fixing part 49, and the other end is fixed to the above-mentioned fixing part 4'9 via a coil spring 50. Further, one end of a first carriage 411 is fixed to a midway portion of the wire 48. Therefore, by rotating the pulse motor 33, the belt 45 rotates and the first carriage 411 is moved, and the second carriage 422 is also moved accordingly. At this time, since the pulleys 47, 47 serve as movable pulleys, the second carriage 422 is moved in the same direction as the first carriage 411 at 1/2 the speed. In addition, the first and second screws 41+, 412
The direction of movement is changed by changing the direction of rotation of the pulse motor 33.

Further, on the document table 2, a copyable range corresponding to the specified paper is displayed. That is, the cassette selection key 304
Let the paper size specified by (Px, Py) be,
If the forward magnification specified by the magnification setting keys 30s and 307 is K, the forward possible range (X, y) is 1x-
Px/KJ.

ry-Py/Kl. This copyable range (x, y)
In the X direction, a pointer 51 provided on the back side of the document table 2
．． 52, and the y direction is indicated by a scale 53 provided on the upper surface of the first carriage 411.
and the distance between the fixed scales 21.

As shown in FIG. 8, the above-mentioned pointers 51.
55 via a spring 56. The pulley 55 is rotated by a motor 58, and by driving the motor 58 according to the water-filled copyable range in the X direction, the distance between the hands 51 and 52 is changed. It is now possible to

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. Then, when the copy key 30 is pressed, the first carriage 41! is first moved toward the second carriage 412, and then the lamp 4 is turned on and moved away from the second carriage 412. When scanning of the original is completed, the lamp 4 is turned off and the first carriage 41
The worker is returned to the home position.

FIG. 9 shows the overall control circuit.

The main processor group 71 detects inputs from the operation panel 30 and input devices 75 such as various switches and sensors, for example, the cassette size detection switches 601 and 602, and includes a high-voltage transformer 76 that drives the various chargers, and the static elimination lamp. 28, a blade solenoid 27a of the cleaner 27; a heater 23a of the fixing roller pair 23;
The exposure lamp 4 and each of the motors 31 to 40.5
8 etc. to perform the above-mentioned copying operation,
Spot light source 131, pulse motor 135, memory 14
0, the erase array 150, the array drive unit 160, etc. are controlled to erase unnecessary portions of the document. In addition, the spot light source 131, the pulse motor 135, i
portrait array 1501 array drive unit 160, memory 140
will be described later.

Among the above motors 31 to 40.58, motor 35.37
．． A toner motor 77 that supplies toner to the developing unit 40 and the developing device 12 is controlled by the main processor group 71 via a motor driver 78.
are controlled by the first sub-processor group 72 via the 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 controlled by the main processor group 71 via the lamp regulator 81, and the heater 23a is controlled by the main processor group 71 via the heater control section 82. Then, from the main processor group 71 to the first and second sub-processor groups 72.7
Drive and stop commands for each motor are sent to the first motor. Second
From sub-processor group 72 and 73 to main processor group 7
1, a status signal indicating the driving or stopping state of each motor is sent. The first sub-processor group 72 also includes a position sensor 83 that detects each initial position of the motors 31 to 34.
Location information has been entered from.

FIG. 10 shows an example of the configuration of the main processor group 71. One-chip microcomputer 91 (hereinafter referred to as
The microcomputer (simply referred to as a microcomputer) detects human power on keys on an operation panel (not shown) and performs various display controls via an input/output board 92.

Further, the microcomputer 91 is expanded by input/output ports 93-96. A high voltage transformer 76, a motor driver 78, a lamp regulator 81, and other outputs are connected to the input/output boat 93.
4 is connected to a size switch for detecting paper size and its oil input, and an input/output port 95 is connected to a copying condition setting switch and its value input. Note that the input/output port 96 is an option.

FIG. 11 shows an example of the configuration of the first sub-processor group 72. The microcomputer 101 is the main processor group 7
1 is connected. Programmable interval
The timer 102 controls the phase switching interval time of the pulse motor. When a set value is set from the microcomputer 101, the timer 102 starts counting reference clock pulses based on the setting value. When the timer 102 has counted out, the end pulse is sent to the microcomputer 101. It is configured to output to the interrupt line. The microcomputer 101 also includes the position sensor 8.
Position information from 3 is input, and input/output boats 103 and 104 are connected. The input/output boat 104 is connected to the motors 31 to 34.135 via the pulse motor driver 79. still,
The input/output capo-i-103 is used, for example, when outputting status signals of each pulse motor to the main processor group 71.

FIG. 12 shows the configuration of the second sub-processor group 73. The microcomputer 111 is connected to the main processor group 71
is connected to. The programmable interval timer 112 controls the phase switching interval time of the pulse motor, and when a set value is set from the microcomputer 111, it starts counting reference clock pulses based on it, and when the count is out, it starts counting the end pulse. It is designed to be output. This termination pulse is latched by the latch circuit 113, and its output is supplied to the interrupt line and input/output board input line of the microcomputer 111. Further, an input/output boat 114 is connected to the microcomputer 111, and motors 36, 38, 39, and 58 are connected to the output port 1-114 via the pulse motor driver 80.

Figure 13 shows the control circuit of the pulse motor.
The input/output boat 121 (corresponding to the input/output boats 104 and 114 in Figs. 11 and 12) has a pulse motor driver 1.
22 (corresponding to the pulse motor drivers 79 and 80 in FIG.
．． 38.39) are connected to each winding mA%B, A, and B.

FIG. 14 shows the pulse motor speed $1711 method. FIG. 3(a) shows the speed curve of the pulse motor, and FIG. 1(b) shows the phase switching interval.

As is clear from this figure, the phase switching interval is long at the beginning;
They gradually shorten, eventually become evenly spaced, gradually lengthen again, and then stop. That is, this shows the slew-up and slew-down of the pulse motor, starting from the self-starting region, being used in the high-speed region, and falling at -. Note that tl, t2, . . . tx indicate the time of the phase switching interval.

Next, the document image erasing means will be explained.

In FIGS. 15 and 16, a guide shaft 130 is provided in the first carriage 411 along the lamp 4 in the part where the light of the lamp 4 is blocked, and this guide shaft 130 has a guide shaft 130 with which the erasing range of the document is set. Subo as a means of giving instructions! - The light source 131 is provided movably. This spot light source 131 is, as shown in FIG.
The light generated by the lens 133 is irradiated onto the document table 2 as 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 a timing belt (toothed belt) 13 disposed along the guide shaft 130.
It is connected to 4. 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,
By rotating the pulse motor 135, the spot light source 131 is moved to the first carriage 41! is moved in a direction perpendicular to the scanning direction. Further, a position sensor 138 consisting of a microswitch for detecting the initial position of the spot light source 131 is provided in the first carriage 41t located at the end of the guide shaft 130 on the pulse motor 135 side. For example, when the spot light source 131 is moved, the spot light source 131 first comes into contact with the position sensor 138 and its initial position is detected.

Next, a method for specifying the erasing range of a document using the spot light source 131 will be described with reference to FIGS. 17 to 19. This spot light source 131 is the operation key 30a.
When ~30d is operated, the light emitting element 132 is moved in a lit state. That is, when the operation keys 30b and 30d are pressed, the motor 33 is driven, and the first carriage 411 and the spot light source 131 are moved in the scanning direction (the direction of the arrow y shown in FIG. 17). In addition, operation keys 30a130c
When you press , the motor 135 is driven and the spot light source 13
1 is moved in a direction perpendicular to the scanning direction (direction of arrow X shown in FIG. 17). The operator operates the operation keys 308 to 30d while visually observing the spot light transmitted through the document G. For example, after moving the spotlight to point Si on the document G shown in FIG. 18(a), the operator presses the position designation key 30e. Press. Then, the coordinate position specified by this S-t is stored in the main processor group 71 shown in FIG. In the same way, move the spotlight to 82 points on the document G and press the position specifying key 30.
When e is pressed, the positions of 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, erase range specification key 30f
When is pressed, as shown in FIG. 18(a), a rectangular area (indicated by diagonal lines) with St, 82 points as diagonal points is designated as the erasing range. Furthermore, as shown in FIG.
When Ω is pressed, the area other than the square with 83.84 points as diagonal points is designated as the erasing range. In this way, when the erasure range designation keys 30f and 30a are pressed, the main processor group 71
The memory 140 stores a high level signal 1111I in the erase range part and a low level signal P0'' in the other part. That is, this memory 140 stores, for example, the capacity in each column direction. A RAM that is approximately equal to the movement distance of the spot light source 131 in the X direction divided by the position resolution in the y direction.
18(a) as shown in FIG. 19(a), and as shown in FIG. 18(b) according to the data supplied from the main processor group 71. For example, as shown in FIG. 19(b), a high level signal is stored at the address corresponding to the shaded area, and a low level signal is stored at the other addresses.

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. 19, the information stored in the memory 140 is also actually inverted in the column direction.

On the other hand, as shown in FIG. 20, 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 FIG. 1(a), this erasing array 150 is fixed via connecting members 1501 and 1502 to a charging device 11 provided on the copying machine main body 1 via a slide rail 11a, for example. Copying machine main body 1 together with charger 11 for charging
It is said to be more removable. As shown in FIG. 1(b), this erasing array 150 is arranged along the longitudinal direction of the photosensitive drum 10, and inside this erasing array 150, as shown in FIG. is installed.

That is, in FIGS. 2A, 2B, and 2C, a plurality of first accommodating parts 151a are arranged at a predetermined pitch on the holder 151 of the erasing array 150, and these first accommodating parts 151a
A plurality of second accommodating portions 151b are arranged along the same and shifted by half a pitch with respect to the first accommodating portion 11151a. A first light emitting diode 152a is housed in the first housing part 151a, and a second light emitting diode 152b having the same shape as the first light emitting diode is housed in the second housing part. Further, -C openings 151C1151d are provided in the first and second accommodating portions 151a and 151b, respectively, facing the photoreceptor drum 10. These openings 151G and 151d are shown in FIG.
), they are arranged in a staggered manner, and the light generated by the first and second light emitting diodes 152a and 152b is irradiated onto the photosensitive drum 10 through these openings 151c and 1151d. Furthermore, the holding body 151 is provided with a circuit board 153, and the first
, the lead wires of the second light emitting diodes 152a and 152b are wired. This board 153 is provided with, for example, an array driving section to be described later, and this board 153 is detachably connected to a connector 154 provided on the main body of the copying machine, as shown in FIG. 1(b). It has become. Note that the number of light emitting diodes arranged in the erase array 150 matches, for example, the capacity of the memory 140 in the column direction.

The erase array 150 is driven by the array driver 160 described above. As shown in FIG. 21, this array driving section 160 includes a shift I 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, a switch circuit 164 consisting of a plurality of switch elements 163 that are controlled on and off by each output signal of the store register 162; The movable contact piece 163 of the switch element 163 is configured with a delay element (DL) 165 that delays the output signal of the store register 162 for a predetermined time.
a is grounded, and fixed contacts 163b are connected to the first and second light emitting diodes 15 constituting the erasing array 150, respectively.
It is connected to each cathode of 2a and 152b. That is,
Among the switching elements 163, the odd numbered switching elements 163 are connected to the cathode of the first light emitting diode 152a, and the even numbered switching elements 163 are connected to the cathode of the second light emitting diode 152b. The anodes of each of these light emitting diodes 152a and 152b are connected to the power supply VCC through current limiting resistors R, respectively.

After specifying the erase range of the original as described above, when the original cover 11 is closed and the copy key 30+ is pressed, the first carriage 411 and the photosensitive drum 10 are operated, and the memory 140 is moved in the row direction. One column of data is sequentially read out (shown in FIG. 19). This read data D! is transferred to the shift register 161 of the array driver 160 by 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 1.
When the first light emitting diode 152a of 50 is reached, 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 disposed between the charger 11 and the exposure section Ph, the
The data for one column is, as shown in FIG. If so, the output timing of the latch signal LTH is controlled so that it is supplied to the store register 162 before θ1/ω.

Among the switch elements 163 of the switch circuit 164, the odd-numbered switch elements 163 are supplied with erase data to the store register 162 and are controlled by the erase data. 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 first light emitting diode 152 connected to the odd numbered switch element 163
A is turned on when the switch element 163 is on, and is turned off when the switch element 163 is off. Further, the erase data outputted from the even-numbered output terminals of the store register 162 is delayed by a predetermined delay time td by a delay element 165 and then supplied to the switch element 163. The delay time td corresponds to a time defined according to the distance 11 between the first and second light emitting diodes 152a and 152b (shown in FIG. 2(b)) and the rotational speed of the photoreceptor drum 10, The erased data output from the store register 162 is delayed by a delay element 163 until the portion erased by the first light emitting diode 152a reaches the position of the second light emitting diode 152b, and then supplied to the switch element 163. be done. FIG. 22 shows the first and second light emitting diodes 152a.
, 152b. By controlling the switch element 163 in this manner, the light emitting diode 152 of the charged portion of the photoreceptor drum 10 is
The portions where a and 152b are lit are neutralized, and no electrostatic latent image is formed in these neutralized portions even if they are subsequently exposed to light.
This means that the original image has been erased. Thereafter, the data in the memory 140 is read out one column at a time in the same manner, and the image is erased.

According to the embodiment described above, the erasing array 150 is attached to the charging device 11 which is detachably attached to the copying machine main body, so that it can be taken out from the copying machine main body. Therefore, even if the erasing array 150 becomes contaminated with developer or the like or the light emitting diodes are damaged, it can be easily taken out from the copying machine body for cleaning or maintenance and inspection.

Further, since the erasing array 150 is provided in the charging charger 11, a separate means for holding the erasing array 150 is not required, and the configuration can be simplified.

Furthermore, the second light emitting diodes 152b are arranged at half the pitch of the first light emitting diodes 152a, and the first and second light emitting diodes 152a, 152b are arranged in a staggered pattern. Therefore, the overall arrangement pitch can be reduced to 1/2 with the same arrangement pitch as the conventional arrangement pitch, and it is possible to improve erasing accuracy.

Furthermore, since it is possible to arrange the light emitting diodes at the same pitch as in the past, it is possible to use commercially available light emitting diodes, and it is possible to suppress a rise in manufacturing costs.

Furthermore, first and second light emitting diodes 152a, 152
b are provided on one side of the circuit board 153, so wiring and soldering are easy.

In the above embodiment, the erasing array 150 includes two rows of light emitting diodes, but the invention is not limited to this, and erasing accuracy can be further improved by using a plurality of rows.

Furthermore, the configuration of the array driving section 160 is not limited to the above embodiment; for example, the erase data supplied to the first and second light emitting diodes 152a1152b is separately generated by the main processor group 71, If the erase data supplied to the light emitting diode 152b is delayed by a predetermined delay time and outputted from the erase data supplied to the first light emitting diode 152a, the delay element 1
65 can be deleted.

It goes without saying that various other modifications can be made without departing from the gist of the invention.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to provide an image forming apparatus that can clean the dirt on the erasing means with a simple configuration and that can facilitate maintenance and inspection. .

[Brief explanation of drawings]

FIG. 1 shows an embodiment of an image forming apparatus according to the present invention. FIG. 1(a) is a side view of the main part showing the configuration of the erasing array, and FIG. 1(b) is a side view of the main part showing the configuration of the erasing array. FIG. 2 is a perspective view of the main parts shown, and FIG. 2 shows the erasure array, FIG.
FIG. 3(C) is a side sectional view of FIG. 3(A), FIG. 3 and FIG.
The figure is a perspective view of the external appearance, Figure 4 is a side sectional view, Figure 5 is a plan view showing the configuration of the operation panel, Figure 6 is a perspective view showing the configuration of the drive section, and Figure 7 is the drive mechanism of the optical system. FIG. 8 is a perspective view schematically showing a pointer drive mechanism; FIG. 9 is a perspective view schematically showing a pointer drive mechanism;
10 is a block diagram showing the overall control circuit, FIG. 10 is a block diagram of the main processor group, FIG. 11 is a block diagram of the first sub-processor group, FIG. 12 is a block diagram of the second sub-processor group, FIG. 13 is a schematic information diagram showing the control circuit of the pulse motor, FIG. 14 is a diagram for explaining the speed control method of the pulse motor, and FIG. 15 is a perspective view of the main part showing the spot light source.
Fig. 16 is a side sectional view of the main part showing the spot light source;
FIG. 18 and FIG.
9 is a diagram shown to explain the contents of the memory, FIG. 20 is a side sectional view of the main part showing the arrangement of the erase array, FIG. 21 is a circuit configuration diagram showing the array drive section, and FIG. 22 is the erase array. FIG. 3 is a diagram shown to explain the light emission timing of the light emitting device. DESCRIPTION OF SYMBOLS 1...Main body, 2...Document table, 10...Photosensitive drum, 11...Charging device, 118...Slide rail, 30...Operation panel, 30a to 30d... Operation key, 30e...Position designation key, 30f, 30Q.
...Erase range specification key, 71...Main processor group, 131...Spot light source, 132...Light emitting element, 133...Lens, 135...Pulse motor, 140...Memory , 150... erasure array, 15
1...Holding body, 152a1152b...First, second
Light emitting diode, 153...Circuit board, 154...
- Connector, 160...Array drive unit, P...Paper, ph...Exposure unit. Applicant's representative Patent attorney Takehiko Suzue (a) Numa Figure 1 (c) 10 Figure 2 Figure 13 Figure 12 Figure 13 Figure 76 Figure 17 Figure 18 (a) - Figure 18 (b) (a ) (b) Figure 19 Figure 20

Claims (4)

[Claims] (1) A scanning device that optically scans a document placed on a document table; a charging device that applies a charge to an image carrier; and an image carrier that carries an optical image obtained by the scanning device; an optical system that forms an image on the body; a developing device that develops the image formed on the image carrier; a transfer device that transfers the developed image to a transfer material; and a designation that specifies an erasing range of the document. and an erasing means that is provided near the image carrier and erases from the image carrier a portion designated by the designation means, characterized in that the erasing means is attached to the charging means. image forming apparatus. (2) The specifying means is provided in the scanning means and is made of a light emitting element that is movable in a direction perpendicular to the moving direction of the scanning means and irradiates the original with a spot light. image forming device. (3) The image forming apparatus according to claim 1, wherein the erasing means is movable with respect to the image carrier together with the charging means. (4) The image forming apparatus according to claim 1, wherein the erasing means comprises a plurality of light emitting elements arranged in the longitudinal direction of the image carrier.