JPS6262381A - Image forming device - Google Patents

Abstract

PURPOSE:To designate and erase and optional part of an original picture image and display the designated extent of erasing and make its confirmation possible, by irradiating spot light that can be moved in the direction at right angles to the direction of scanning of the original. CONSTITUTION:A spot light source 131 that can be moved in (x) direction by a pulse motor 135 is provided on a guide shaft 130 provided in a carriage 41 that moves in the direction of scanning (y). The carriage and spot light are shifted in the direction of arrow (y) by depressing an operation key, and then only the spot light is moved in the direction (x), and then, the carriage and spot light are moved again. By repeating this procedure, an extent of erasing is designated on the original, and stored in a processor. The processor moves the spot light successively in the direction of the arrow according to the memory and displays the extent of erasing, at the same time, controls light that irradiates a sensitive drum. By this way, it becomes possible to obtain a picture image from which an electrostatic latent image is erased.

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]

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

Incidentally, recently, copying machines have been developed that are capable of specifying a desired portion of a document image and erasing the image of the specified portion before making a copy. In this type of copying machine, it would be convenient in practice if the erasing range of a designated image could be confirmed on the document.

[Purpose of the invention]

This invention was made based on the above circumstances,
The purpose is to provide an image forming apparatus that is capable of specifying and erasing any part of a document image, and also of confirming the specified erasing range.

[Summary of the invention]

This invention, for example, irradiates a spot light onto an original image, moves this spotlight to specify an erasing range, and irradiates a photoreceptor drum with light corresponding to the designated erasing range to form an electrostatic latent image. Alternatively, an image is formed by erasing the charge, and in particular, a specified erasing range is displayed on the document using the spotlight, and this erasing range is displayed on fixed scales provided at both ends of the document table. It is possible to display using either side as a reference.

[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. Fixed scales 21 and 22 are provided at both ends of the document table 2 to serve as a reference for setting the document.
A document cover 11 and a work table 12, which can be opened and closed, are provided near the. The original placed on the original platen 2 is exposed by an optical system consisting of an exposure lamp 4 and mirrors 5, 6, 7 being reciprocated in the direction of arrow a along the lower surface of the original platen 2. It is meant to be scanned. In this case, mirror 6.7 is configured to maintain the light exposure length.
It is moved at 1/2 the speed of the mirror 5. 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, and then passes through the variable magnification lens block 8.
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 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 electrostatic latent image is made visible by applying toner by the developing device 12.

On the other hand, the paper (transfer material) 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, and the taken out paper is taken out from the paper guide path 17 or 18 and is guided 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 a cassette size detection switch 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. The transferred image is fixed by passing through this, 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 section and paper jams; 304 is a cassette selection key for selecting the upper and lower paper feed cassettes 13 and 14; 305 is a selected key. A cassette display section that displays the cassette; 30s is a magnification setting key that sets the magnification and reduction magnification of copies in a predetermined relationship; 307 is a zoom key that sets the magnification and reduction magnification steplessly; 30g displays the set magnification A display section, 309 is a density setting section for setting the copy density, 30a, 30b, 130C, and 30d are operation keys for moving a spot light source that indicates the erase 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 30o are erase range designation keys 3 for specifying the erase range at specified positions, respectively.
oh130i is for displaying the specified erasure range, 30h is a check key for displaying based on the fixed scale 21, and 30i is a check key for displaying based on the fixed scale 22.
This is a check key to display based on.

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. 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. 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 42r and 422 in the direction of arrow a. It is said to be able to move in parallel. Also, 4
The phase pulse motor 33 drives a pulley 43. An endless belt 45 is stretched between the pulley 43 and the fiddle pulley 44, and one end of a first main spear 411 that supports the mirror 5 is fixed to a midway portion of the belt 45. On the other hand, two pulleys 47.47 are rotatably provided in the guide portion 46 of the second carriage 422 that supports the mirror 6.7 and are spaced apart in the axial direction of the rail 422. wire 4 to
8 is hanging. One end of this wire 48 is attached to the fixed part 4
9, the other end is fixed to the fixing part 49 via a coil spring 50, respectively. In addition, the wire 48
One end of the first carriage 41 is fixed in the middle. 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 and 47 serve as movable pulleys, the second carriage 422
are moved in the same direction at 1/2 the speed. In addition, first,
The direction of movement of the second carriages 411, 412 is controlled by switching 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 copy magnification specified by the magnification setting keys 30s and 307 is K, then the copying possible clause v! J(xSy) is rx
-Px/KJ.

ry-Py/Kl. This copyable range (X.

y), the X direction is indicated by the distance between the pointers 51 and 52 provided on the back surface of the document table 2, and the y direction is indicated by the distance between the scale 53 provided on the upper surface of the first carriage 411 and the fixed point. It is displayed by the distance between the scales 21.

The above-mentioned pointers 51 and 52 are connected to pulleys 54 and
55 via a spring 56. The pulley 55 is rotated by a motor 58, and the distance between the pointers 51 and 52 is changed by driving the motor 58 in accordance with the determined copyable range in the X direction. It looks like this.

Further, the first carriage 411 is moved to a predetermined position (home position according to the magnification) by driving the motor 33 according to the paper size and magnification. And copy key 30! When is pressed, the first carriage 411 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
1 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 operates a high voltage transformer 76 that drives the various chargers, and the snow removal lamp. 28, the blade solenoid 27a of the creases 2 and 7, the heater 23 of the constant 10-ra pair 23;
a, the exposure lamp 4, and each of the motors 31 to 40;
．． 58, etc., to perform the above-mentioned copying operation, and also control the spot light source 131, pulse motor 135, memory 140, erasing array 150, array drive section 160, etc. to perform the operation of erasing unnecessary portions of the original. It is something. In addition, a spot light source 131 and a pulse motor 135
, erase array 150, array driver 160, memory 14
0 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 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 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-O setter 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 other human power, and to the input/output port 95 is connected a copying condition setting switch and other human power. 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 board 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 l of the pulse motor and the 7J exchange interval FR, and when a set value is set from the microcomputer 111, it starts counting reference clock pulses based on it, and the count-out occurs. Then, a termination pulse is output. 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 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 other.

FIG. 14 shows a method for controlling the speed of a pulse motor. 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, then become evenly spaced, then gradually lengthen again, and then stop. In other words, this indicates the through-up and through-down of the pulse motor, starting from the self-starting region, being used in the high-speed region, and finally falling down. 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. Spot light source 1 as a means of giving instructions
31 is movably provided. This subo, light H
As shown in FIG. 16, reference numeral 131 includes 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 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 in a direction perpendicular to the scanning direction of the first carriage 411.

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 411 located at the end of the guide shaft 130 on the pulse motor 135 side.

For example, when the spot light 11131 is moved, the spot light [131] first comes into contact with the position sensor 138 and the 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. When specifying the erasing range of a document, the document G is set with the copy side facing up on the fixed scale 22 side, as shown in FIG.

In this state, when the operation keys 30a to 30d are operated, a spot light! ! 131 is moved with the light emitting element 132 turned on. That is, operation keys 301), 30d
When you press , the motor 33 is driven and the first carriage 41
1 and the spot light source 131 are moved in the scanning direction (direction of arrow X shown in FIG. 17). In addition, the operation keys 30a,
When 30c is pressed, the motor 135 is driven and the spot light source 131 is moved in a direction perpendicular to the scanning direction (direction of arrow X shown in FIG. 17). The operator operates the operation keys 30a to 30d while visually observing the spot light transmitted through the document G. For example, after moving the spotlight to 81 points on the document G shown in FIG. 18(a), the operator presses the position designation key 30e. Press.

Then, this S! The coordinate position specified by is stored in the main processor group 71 shown in FIG. Similarly, when the spot light is moved to the 82nd point on the document G and the position specification key 30e is pressed, the position of the 82nd point is moved to the main processor group 7.
1 is stored. 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 3
When 0f is pressed, Ss, 8 as shown in Fig. 18<a)
A rectangular area (indicated by diagonal lines) with two diagonal points is designated as the erasing range. Also, as shown in FIG. 18(b), if you specify points 83 and 84 on the original G and press the erase range designation key 30Q, the area other than the square with diagonal points Sg and 84 will be set as the erase range. It is specified. in this way,
When the erase range designation keys 30f and 30g are pressed, the main processor group 71 performs calculations based on the positions of the two specified points and the copy magnification, and a high level signal "1'° is stored in the memory 140 in the erase range area. , a low level signal "0" is stored in the other parts. That is, this memory 14
0 is, for example, R where the customer demographics in each row are approximately equal to the movement distance of the spot light source 131 in the X direction divided by the position resolution in the y and X directions.
AM, main processor group 71
In the case of FIG. 18(a), the data supplied by
), as shown in FIG. 19(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.

The original G whose erasing range has been designated as described above is reversed in the X direction shown in FIG. 17, and set on the fixed scale 21 side to be copied with the copy side facing down. Ru. Therefore, in this state, the original image and the erased data stored in the memory 140 are associated with each other.

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 FIGS. 21 and 22, this erasing array 150 has a plurality of light shielding cells 151 arranged in a direction perpendicular to the rotational direction of the photoreceptor drum 10, and each light shielding cell 151 has a plurality of light shielding cells 151 arranged therein in a direction perpendicular to the rotational direction of the photoreceptor drum 10. A light emitting element 152 made of, for example, a light emitting diode as shown in FIGS. 23(a) and 23(b) 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 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, the total length of the erasing array 150 is Q-NxP.

The erase array 150 is driven by the array driver 160 described above. As shown in FIG. 24, 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 16 in which the contents of this shift register 161 are held.
2. It is constituted by a switch circuit 164 consisting of a plurality of switch elements 163 that are turned on and off by each output signal of the store register 162, and the movable contacts 163a of these switch elements 163 are grounded, and the fixed contacts 163b are connected to each cathode of the light emitting elements 152 constituting the erase array 150, respectively. The anode of each of these light emitting elements 152 is connected to the power supply Vcc via a current limiting resistor R, respectively.

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 moved in the row direction. One column of data is sequentially read out (shown in FIG. 19). 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, the erase array 150 includes the charger 11 and the exposure section ph.
For example, one column of data output from the memory 140 is arranged between the erase array 150 and the erase array 150.
Assuming that the angle of the exposed portion ph is θ1 and the photosensitive drum 10 is rotating at each speed, θ! The latch signal LTH is supplied to the store register 162 before /ω.
output timing 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 parts of the photoreceptor drum 10, the part where the light emitting element 152 is turned on is charge-free, and even if the charge-free part is exposed afterwards, no electrostatic latent image is formed, and the original image is not erased. It means that it was done. Thereafter, the data in the memory 140 is read out one column at a time in the same manner, and the image is erased.

Next, the gist of the invention will be explained. In this embodiment, when any of the check keys 30h130i is operated, the specified erasure range is displayed on the document table 2 by the spot light source 131. For example, as shown in FIG. 1, the range S1 (×1
, yl), 32 (After specifying X2 , V2 >,
When the check key 30i is operated, the specified erasure range is displayed based on the fixed scale 22 side. That is, when the check key 30i is operated, the main processor group 71 first moves the spot light source 131 to the stored coordinate position 81 (Xt, yl), and then moves the spot light source 131 to this coordinate position S1. In this state, the main processor group 7 is connected to the light emitting element 132.
A lighting signal is supplied from 1, and this is turned on. In this state, the first carriage 411, the spot light source 13
1 is driven, and the spot light is moved according to the arrow shown in FIG. That is, first, only the spot light source 131 is driven to move the spot light from the coordinate position S1 (Xt, Vx) to (X2, yt), and then only the first carriage 411 is driven to move the spot light to the coordinate position (X2, yt).
2 , Vx ) to coordinate position 182 (X2 , V2 ). Zarani, Spotlight I again! ! 131 is driven to move the spot light to the coordinate position (xl, y2), and finally, only the first carriage 411 is driven to move the spot light from the coordinate position (Xl, V2) to the coordinate position S1 (xl, yl). In this way, the erasing range is displayed, and when the spot light source 131 reaches the coordinate position S1, the light emitting element 132 is turned off.

Furthermore, when multiple erasure ranges are specified, when the display of a certain erasure range is completed, the spot light source 131 is moved to another designated coordinate position, and the erasure range is displayed by the same operation as described above.

On the other hand, when the check key 30h is operated, the erasure range is displayed based on the fixed scale 2 ri side. That is,
As shown in FIG. 1, after specifying the erasing range, set the document G with the copy side facing down on the fixed scale 21 side as shown in FIG. 2, and operate the chinick key 30h. Stored coordinate position S1・
S2 is the coordinate position SR1 with the fixed scale 21 side as a reference
, SR2. That is, this coordinate position SRI, S
R2 is the coordinate position S1.R2 with the center of the document table 2 as a reference.
It is said to be line symmetrical with S2. In the main processor group 71, based on the converted coordinate positions SR1 and SR2,
As mentioned above, the first carriage 411 and the spot light source 1
31 is controlled, and the spot light is moved as shown by the arrow in FIG. 2 to display the erasing range.

According to the above embodiment, the specified erasing range can be displayed using spot light. Therefore, the erased range can be easily confirmed. Moreover, the erasing range can be checked on the fixed scale 21 side or the fixed scale 22 side of the document table 2 depending on the position where the document is set, depending on the operation of the check keys 30h and 30i, which is convenient in practice. It is something.

Furthermore, since the erasing range is displayed using the spot light source 131 that specifies the erasing range, there is no need for a separate display device, and it is possible to suppress the 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 that shown in FIG. 20, but as shown in FIG.
It is also possible to arrange the electrostatic latent image in such a way that the formed electrostatic latent image can be erased according to a designation.

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, an image forming apparatus is provided that is capable of specifying and erasing any part of a document image and also of confirming the specified erasing range. Can be provided.

[Brief explanation of the drawing]

The drawings show an embodiment of the image forming apparatus according to the present invention, and FIGS. 1 and 2 are plan views of main parts, and FIGS. 4
The figures show the configuration of the image forming apparatus, and FIG. 3 is an external perspective view, FIG. 4 is a side sectional view, FIG. 5 is a plan view showing the configuration of the operation panel, and FIG. 6 is the configuration of the drive unit. A perspective view showing
FIG. 7 is a perspective view schematically showing the drive mechanism of the optical system;
The figure is a perspective view schematically showing the pointer drive mechanism, Figure 9 is a configuration diagram showing the overall control circuit, Figure 10 is a configuration diagram of the main processor group, and Figure 11 is the configuration of the first sub-processor group. Figure 12 is a configuration diagram of the second sub-processor group;
Figure 3 is a schematic configuration diagram showing the control circuit of the pulse motor.
4 is a diagram shown to explain the speed control method of the pulse motor, FIG. 15 is a perspective view of the main part showing the spot light source, and 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, and FIG.
Fig. 22 shows the relationship between the erasing array and the photosensitive drum. Fig. 21 is a perspective view showing only the main parts, Fig. 22 is a front view showing only the main parts, and Fig. 23 is a diagram of the erasing array. The configuration is shown in FIG. 24 (a) is a side sectional view, FIG. 24 (b) is a partially cutaway front view, FIG. 24 is a circuit port showing the configuration of the array drive section, and FIG. 25 is a side sectional view. FIG. 3 is a side sectional view of a main part showing another example of the arrangement of the erasing array. DESCRIPTION OF SYMBOLS 1...Main body, 2...Document stand, 10...Photoconductor drum, 30...Operation panel, 30a-30d...Operation keys, 30e...Position specification key, 30f, 30g...
・Erase range specification key, 30h, 30i...Check key, 71...Main processor group, 131...Spot light source, 140...Memory, 150...Erase array, 160...Array drive unit , P...Paper, Ph.
...Exposure section. Applicant's Representative Patent Attorney Takehiko Suzue 3rd WI Figure 6 Figure 12 Figure 13 Figure 18 (a) Figure 18 (b) (a) (b) Figure 19 Figure 20 Figure 25 Figure 21 ( a) (b) Figure 23

Claims (2)

[Claims] (1) In an image forming apparatus that optically scans a document placed on a document table using a scanning means and transfers an image corresponding to the image of the document to a transfer material, the image forming apparatus is provided at both ends of the document table. first and second original setting standards; an indicating means provided in the scanning means for instructing a predetermined range of the original set on the second original setting standard side using transmitted light; and a corresponding to the specified range. and a control means for selectively displaying the erasing range of the document specified by the instruction means on the reference side of the first and second document sets using the instruction means. An image forming apparatus characterized by: (2) The image forming apparatus according to claim 1, wherein the instruction means comprises a light emitting element that is movable in a direction perpendicular to the direction of movement of the scanning means and irradiates the document with a spot light.