JPS61243469A - Image forming device - Google Patents

Abstract

PURPOSE:To specify and erase an optional part of an original image and to facilitate specifying operation by moving spot light with which the original image is irradiated and specifying the erasure range while varying the moving speed of the spot light according to the operation of operation keys. CONSTITUTION:The spot light with which an original platen 2 is irradiated from a spot light source provided opposite the original platen 2 is moved to specify an erasure range. For example, operation keys 30a-30d are operated to move the spot light to points S1 and S2 on an original G and an erasure range specifying key 30f is operated to specify a rectangular area which has points S1 and S2 as diagonal points as an erasure range. The operation keys 30a-30d consists of movable contacts 171, 172 and 173, and a movable element 174; when the movable element 174 is operated lightly, the contacts 171 and 172 contact each other to set a low-speed driving mode and when the movable element 174 is operated strongly, the contacts 171, 172 and 173 all contact one another to set a high speed driving mode. Consequently, the spot light is moved to a desired position efficiently.

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.

By the way, there may be unnecessary parts in the original image. However, conventional copying machines rarely allow copying by selectively erasing original images.

Furthermore, it would be convenient in practice if the erasure range of the original image could be specified easily and efficiently.

[Purpose of the invention]

This invention was made based on the above circumstances,
The purpose is to provide an image forming apparatus that can specify and erase any part of a document image and that allows easy specification operations.

[Summary of the invention]

This invention, for example, irradiates a spot light onto an original image, moves this spotlight to designate an erasing range, and irradiates light onto a photoreceptor drum corresponding to the designated erasing range to erase an electrostatic latent image. It is intended to form an image by erasing the charge, and in particular to change the moving speed of the spot light according to the operating force of the operating key.

[Embodiments of the invention]

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

3 and 4 schematically show an image forming apparatus, such as a copying machine, according to the present invention. That is, 1 is a main body of a copying machine, and a document table (transparent glass) 2 is fixed to the upper surface of the main body 1 to support a document. 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 table 2 is exposed to an exposure lamp 4 and a mirror 5.
．． By reciprocating the optical system 6.7 in the direction of arrow a along the lower surface of the document table 2, exposure scanning is performed during the reciprocation. In this case, mirror 6.7 moves at the speed of mirror 5, 172, so as to maintain the light 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 passes through the mirror 9. The original image is reflected by the photoreceptor drum 10 and guided to the photoreceptor drum 10.
The image is formed on the surface of the

The photosensitive drum 10 rotates in the direction of arrow C in the figure, and the surface is first charged by the charging device 11, and then the image is exposed to slit light, thereby forming an electrostatic latent image on the surface. This electrostatic latent image is made visible by applying toner by a developing device 12.

On the other hand, the paper (image-forming object) P is taken out one by one from the selected upper paper feed cassette 13 or lower paper feed cassette 14 by the delivery rollers 15 or 1 and 6. It is guided through a guide 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. Note that 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 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 arranged to be placed on a tray 25 outside the main body 1 by a pair of paper ejection 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. 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 the selected cassette. 30s is a magnification setting key for setting the enlargement and reduction magnification of the copy in a predetermined relationship, 307 is a zoom key for steplessly setting the enlargement and reduction magnification, and 30g is a display for displaying the set magnification. A section 309 is a density setting section 30'a, 30b for setting the copy density.

30c and 30d are operation keys for moving a spot light source indicating the erasing position of the document, which will be described later, 30e is a position specification key for inputting the coordinate position indicated by the spot light source, and 30f
, 30 and 1 are erasing range designation keys for specifying erasing ranges at designated positions, respectively.

FIG. 6 shows an example of the configuration of a drive source for each drive section of the copying machine configured as described above, and is composed of the following motors. That is, 31 is a lens motor, which is a motor for moving the position of the lens block 8 for performing magnification change.

32 is a mirror monitor, and is a motor for changing the distance (optical path length) between the mirror 5 and 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 1o 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. A drum motor 36 is a motor for driving the photosensitive drum 10. 37 is a fixing motor that connects the paper conveyance path 22 and the fixing roller pair 2.
3 and a pair of paper discharge rollers 24. Reference numeral 38 is a paper feed motor, which is connected to the feed rollers 15 and 16.
This is a motor for driving. A paper feeding motor 39 is a motor for driving the registration roller pair 19. 40 is a fan motor, which is connected to the cooling fan 29.
This is a motor for driving.

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, respectively, and these carriages 411, 412 are guided by guide rails 421, 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. An 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. On the other hand, two pulleys 47.47 are rotatably provided in the guide portion 46 of the second carriage 422 that supports the mirror 6.7 and are spaced apart in the axial direction of the rail 422. A wire 48 is strung around. One end of this wire 48 is fixed to a fixed part 49, and the other end is fixed to the fixed part 49 via a coil spring 50. Further, one end of a first carriage 411 is fixed to a midway portion of the wire 48. Therefore, as the pulse motor 33 rotates, the belt 45 rotates, the first carriage 411 moves, and the second carriage 422 also moves accordingly. At this time, since the pulleys 47 and 47 act as movable pulleys, the first
The second carriage 422 is 1/1 of the carriage 411.
move in the same direction at a speed of 2.

Note that the moving directions of the first and second carriages 411 and 412 are controlled by switching the rotation direction of the pulse motor 33.

Further, on the document table 2, a copyable range corresponding to the specified paper is displayed. That is, the paper selection key 304
Let the paper size specified by (PX, Py) be,
If the copy magnification specified by magnification setting keys 306 and 307 is K, then the copyable range (x, y), rx=P
x/KJ.

rV-P'//KJ. This copyable range (X, y
), the X direction is indicated by the pointer 5 provided on the back of the document table 2.
1.52, and the y direction is indicated by a scale 53 provided on the upper surface of the first carriage 411.

As shown in FIG. 8, the above-mentioned pointers 51 and 52
．． 55 via a spring 56. The pulley 55 is a motor 58
This motor 58
The distance between the hands 51 and 52 can be changed by rotating the hands according to the paper size and magnification.

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 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. 9 shows the overall control circuit, in which the main processor group 71 and the first . It is mainly composed of a second sub-processor group 72 and 73. The main processor group 71 is
Operation panel 30 and various others.

A high-voltage transformer 76 that detects input from an input device 75 such as a switch or sensor such as the cassette size detection switch 6 (h, 602) and drives the various chargers;
the static elimination lamp 28, the blade solenoid 27a1 of the cleaner 27, the 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, array drive unit 160, etc. are controlled to perform an operation of erasing undesirable portions of the document. Note that the spot light [131, pulse motor 135, erasing array 1
50, array driver 160, and 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 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 a lamp regulator 81, and the heater 23a is controlled by the main processor group 71 via a heater control section 82.

be done. Then, commands to drive and stop each motor are sent from the main processor group 71 to the first and second sub-processor groups 72 and 73, and the first and second sub-processor groups 72 and 73 receive instructions to drive and stop each motor. Second sub-processor group 72.7
3 sends a status signal to the main processor group 71 indicating the drive or stop state of each motor. 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.

FIG. 10 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 through an input/output port 92. Also, 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 port 93, and a size switch for detecting paper size and other inputs are connected to the input/output port 94.
A copy condition setting switch and other inputs are connected to the input/output port 95. Note that the input/output port 96 is for an option.

FIG. 11 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 ports 103 and 104.

The motors 31 to 34.135 are connected to the input/output port 104 via the pulse motor driver 79. The input/output port 103 sends the status signal of each pulse motor to the main processor group 71.
Used when outputting to.

FIG. 12 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 port 114 is connected to the microcomputer 111, and motors 36, 38, 39, and 58 are connected to this output port 114 via the pulse motor driver 80.

Figure 13 shows the control circuit of the pulse motor, and shows the input/output port 121 (input/output port 1 in Figures 11 and 12).
04.114) has a pulse motor driver 122
(corresponding to the pulse motor drivers 79 and 80 in FIG. 9) are connected, and the pulse motor 1 is connected to this pulse motor driver 122.
23 (the pulse motors 31 to 34, 36, 38, 39
The windings A, B, τ, and (corresponding to the above) are connected.

Figure 14 shows a method for controlling the speed of a pulse motor.

The figure (a) shows the speed curve of the pulse motor, and the figure (b) shows the phase switching interval. As is clear from this figure,
At first, the phase switching interval is long, gradually shortens, then becomes equal, then becomes gradually longer again, and then stops. That is, this indicates the slew-up and slew-down of the pulse motor, starting from the self-starting region, being used in the high-speed region, and finally falling down. In addition, tl, t2・
...tx indicates the time of the phase switching interval.

Next, a means for erasing original uniformity 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. Spotlight as a means of giving instructions! 1
31 is movably provided. This spot light source 1
As shown in FIG. 16, reference numeral 31 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 32 is irradiated onto the document table 2 by a lens 133 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 connected to the guide shaft 130.
Timing belt (toothed belt) arranged along
134. This timing belt 138
<Pulley 136 provided on the rotating shaft of the Luz motor 135
A hook is passed between the driven pulley 137 and the driven pulley 137. Therefore, by rotating the pulse motor 135, the spot light [131] is moved in a direction perpendicular to the scanning direction of the first carriage 411. Further, the first carriage 411 located at the end of the guide shaft 130 on the pulse motor 135 side is provided with a position sensor 138 consisting of a microswitch that detects the initial position of the spot light WA131.

For example, when the spot light source 131 is moved, first,
The spot light source 131 comes into contact with the position sensor 138 to detect the initial position.

Next, using FIGS. 17 to 19, the above spot light!
A method of specifying the erasing range of a document using 131 will be explained. This spot light source 131 is moved with the light emitting element 132 turned on by operating the above-described operations *-30a to 30d while the main processor group 71, which will be described later, is in the document erasure range designation mode. That is, when the operation keys 30b and 30d are pressed, the motor 33
is driven, and the first carriage 411 and the spotlight 2
1j [131 is the scanning direction (arrow y direction shown in FIG. 17)
will be moved to Further, when the operation keys 30a and 30c are pressed, the motor 135 is driven, and the spot light source 131 is moved in a direction perpendicular to the scanning direction (in the direction of arrow X shown in FIG. 17). The operator operates the operation keys 308 to 30d while visually observing the spotlight transmitted through the document G, and presses the position designation key 30e after moving the spotlight to point S1 on the document G shown in FIG. 18(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 is controlled by a pulse motor 33, for example.
．． This can be detected by counting the number of 135 drive pulses. Thereafter, when the erasure range designation key 30f is pressed, a rectangular area (indicated by diagonal lines) having the 31.82 rotation as a diagonal point is designated as the erasure range, as shown in FIG. 18(a). Also, as shown in FIG. 18(b), 8
When points 9 and 84 are specified and the erase range designation key 30Ω is pressed, the area other than the square with Ss and 34 points as diagonal points is specified as the erase range. In this way, when the erasure range designation keys 30f and 30Q are pressed, the main processor group 71 performs calculations based on the positions of the two designated points and the copy magnification, and the memory 140 stores a high level signal in the erasure range. ``1'', low level signal n in other parts
un is memorized.

That is, this memory 140 is constituted by a RAM whose capacity in each column direction 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 force direction, and is , in the case of FIG. 18 (a>), as shown in FIG. 19 (a), and in the case of FIG. 18 (b), as shown in FIG.
As shown in Figure (b), high level signals are stored in addresses corresponding to the shaded areas, and low level signals are stored in other addresses.

In this case, the original is set with the copy side facing up,
After the erasure range has been specified, the document is turned over along the fixed scale 21 of the document table 2. Therefore, the information stored in the memory 140 as shown in FIG. 19 is actually stored 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 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 of the light-shielding cells 151 has a A light emitting element 152 made of a light emitting diode, for example, as shown in FIGS. 23(a) and 23(b) is provided. Further, the light from the light emitting element 152 is transmitted to the opening of each cell 151 facing the photoreceptor drum 10.
A lens 153 is provided to condense light on the surface. 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, the distance between the light emitting elements 152 is P, and the number is N.
The total length of the erase array 150 is Q-NXP. , y = 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 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 anode of each of these light emitting elements 152 is connected to the power supply VCC through 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 3 (h is pressed), the first carriage 411 and the photosensitive drum 10 are operated, and the memory 140 is Data for one column is sequentially read out in the row direction (shown in FIG. 19).This read data D1 is transferred to the shift register 161 of the array drive 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 it reaches 0, the main processor group 71 outputs a latch signal LTH, which is supplied to the shift register 162 in response to this signal.

That is, the erasing array 150 includes the charger 11 and the exposure section ph.
For example, one row of data output from the memory 140 is arranged between the erase array 15 and
0 and the exposed part Ph is θ1, and the photoreceptor drum 10
is rotating at each speed, the latch signal LT is supplied to the store register 162 before θ1/ω.
The output timing of H 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 162 is on, and are turned off when the switch element 162 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 or manuscript image is erased. This means that this has been done. 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.

As mentioned above, the movement of the spot light source 131 is performed using the operation key 3.
In this embodiment, the moving speed of the spot light source changes depending on the operating force of the operation keys 308 to 30d. That is,
The operation keys 308 to 30d each have first, second, and third movable contact pieces 171, 172.1, as shown in FIG. 1(a).
73 and a mover 174, and the mover 174 is covered with a cover 175.

In such a configuration, as shown in FIG. 1(b), when the movable member 174 is lightly operated through the cover 175, first, the first movable contact piece 171 and the second movable contact piece 172 are brought into contact with each other. A low speed drive mode is set in the main processor group 71, and the spot light source 131 is driven at a low speed. In this state, when the movable element 174 is operated roughly and strongly, the first, second,
The third movable contact pieces 171, 172, 173 are all brought into contact. Therefore, the main processor group 71 is set to a high-speed drive mode, and the spot light source 131 is moved at high speed. Incidentally, when the main processor group 71 is set to the low-speed drive mode or the high-speed drive mode, a speed control signal is supplied to the first and second sub-processor groups 72 and 73. At 72.73, the pulse motor 33.135 is controlled.

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

Further, by changing the operating force of the operating keys 308 to 30d, the moving speed of the spotlight can be changed. Therefore, for example, when specifying an erasure range, the spotlight is moved at high speed to the vicinity of the specified diagonal point, and
After moving to the vicinity of the diagonal point, the spot light can be moved at a low speed, so the spot light can be moved efficiently and the spot light can be quickly moved to a specified desired position.

Next, other embodiments of the invention will be described.

In the above embodiment, the moving speed of the spot light is in two steps, but it is also possible to make it stepless. FIG. 2 shows an example. That is, a pressure sensor 76 is provided below the movable element 174, and this pressure sensor 76
The operating pressure of the movable element 174 is detected by this.

In such a configuration, when the movable element 174 is operated through the cover 175, a signal corresponding to the operating force is output from the pressure sensor 176. For example, after A/D converting this signal, it is supplied to the main processor group 71, and the main processor group 71 outputs a speed control signal according to the input signal.
It becomes possible to move the spotlight at a desired speed according to the operating force of ~30d. Even with such a configuration, it is possible to obtain the same effects as in the above embodiment.

Further, the arrangement position of the erasing array 150 is not limited to between the charger 11 and the exposure section Ph as shown in FIG. 20, but also between the exposure section Ph and the developing device 12 as shown in FIG. However, it is also possible to configure the electrostatic latent image that has been formed to 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, it is possible to designate and erase any part of a document image, and to provide an image forming apparatus in which the designation operation is easy.

[Brief explanation of drawings]

Fig. 1- shows an embodiment of an image forming apparatus according to the present invention, and is a side sectional view showing only the main parts, Fig. 2 is a side sectional view showing another embodiment of the invention, and Fig. 3 , FIG. 4 shows the configuration of the image forming apparatus, 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 a drive Perspective view 1 showing the structure of the 7th part
The figure is a perspective view schematically showing the optical system drive mechanism, Figure 8 is a perspective view schematically showing the pointer drive mechanism, Figure 9 is a perspective view showing the overall control circuit, and Figure 10 is the main A configuration diagram of the processor group, FIG. 11 is a configuration diagram of the first sub-processor group, FIG. 12 is a configuration diagram of the second sub-processor group, FIG. 13 is a schematic configuration diagram showing the control circuit of the pulse motor, and FIG. 14 is a diagram to explain the speed control method of a pulse motor,
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, and Figs. 17 and 18 respectively show the operation of specifying the erasing range of the document using the spot light source. FIG. 19 is a plan view for explaining the contents of the memory, FIG. 20 is a side sectional view of the main part showing the arrangement of the erase array, and FIGS. 21 and 22 are the erase arrays. 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 shows the configuration of the erasing array. Figure (a) is a side sectional view, Figure (b) is a partially cutaway front view, Figure 24 is a circuit diagram showing the configuration of the array drive section, and Figure 25 is another arrangement of the erasing array. FIG. 3 is a side sectional view of a main part showing an example. DESCRIPTION OF SYMBOLS 1...Main body, 2...Document stand, 30...Operation panel, 30a-30d...Operation keys, 30e...Position specification key, 10...Photosensitive drum, 71...Main Processor group, 131...Spot light source, 132...
Light emitting element, 133... Lens, 135... Pulse motor, 140... Memory, 150... Erasing array,
152... Light emitting element, 153... Lens, 160...
...Array drive unit, P...paper, ph...exposure unit,
171.172.173...Movable contact piece, 176...
pressure sensor. Applicant's agent Patent attorney Takehiko Suzue Figure 6 Figure 8rI! J Fig. 16d Fig. 17 Fig. 18 (a) Fig. 18 Fig. 19 (a) (b) Fig. 20 Fig. 25 Fig. 22 (a) (b)

Claims (4)

[Claims] (1) In an image forming apparatus that optically scans a document placed on a document table and transfers an image corresponding to the image of the document onto a transfer material, a predetermined area of the document is provided in the operating means and uses transmitted light to scan a predetermined area of the document. an instruction means for instructing, an erasing means for erasing an image corresponding to the specified range, an operation means for specifying a movement position of the instruction means, and a movement of the specification means according to the operating force of the operation means. An image forming apparatus comprising: a control means for controlling speed. (2) The image forming apparatus according to claim 1, wherein the instruction means is comprised of a light emitting element that is movable in a direction perpendicular to the moving direction of the operating means and irradiates the document with a spotlight. (3) The image forming apparatus according to claim 1, wherein the operating means comprises a key whose movable contact piece is switched and connected according to the operating force. (4) The operating means comprises a pressure sensor that outputs a signal according to the operating force.
The image forming apparatus described in .