JPS61273560A - Image forming device - Google Patents

Abstract

PURPOSE:To specify and erase an optional part of an original image and to perform economically advantageous and secure erasure by specifying the erasure pitch of an erasing means which erases an image. CONSTITUTION:The carriage return pitch of a general typewriter is generally 1/6 inch in addition to 1/4 and 1/3 pitches and they are the majority of pitches. Therefore, when the arrangement pitch P of light emitting elements 152 which constitute an erasure array 150 is set to, for example, 1/12 inch, a document is not erased however an erasure range is specified and complete erasure is performed. When this arrangement pitch is set, any carriage return pitch of an original is handled, so the number of the elements 152 is minimized. The pitch P of the element 152 is settable to not only 1/12 inch, but also 1/12n (n: integer).

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 Problems thereof) Generally, electronic copying machines have the function of copying an original image onto paper as is, or enlarging or reducing the original image and making a copy.

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

By the way, the line feed pitch of manuscripts printed with general typewriters is often 1/6.1/4.1/3 inches, so it would be extremely useful if images could be erased in accordance with this pitch. It's convenient.

[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 that is economically advantageous and capable of reliably erasing images. .

[Summary of the invention]

In this invention, for example, a spot light is irradiated onto an original image, the spot light is moved to specify an erasing range, and a photosensitive drum is irradiated with light corresponding to the designated erasing range to form an electrostatic II image. Alternatively, an image is formed by erasing the charge, and in particular, the arrangement pitch of the light emitting elements constituting the erasing array is set to 1/12n (n is an integer) inch to ensure efficient erasing. It is.

[Embodiments of the invention]

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

5 and 6 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 1 that can be opened freely and a work table 12 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 half the speed of mirror 5 so as to maintain the optical exposure length. The light reflected from the original by the scanning of the optical system, that is, the light reflected from the original by the light irradiation of the exposure lamp 4 is reflected by the mirror 5, 6, 7, passes through the variable magnification lens block 8, and further 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 roller 515 or 16, passes through the paper guide path 17 or 18, and then passes through the registration rollers. versus 19
and is guided to the 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 60 ls 602. This cassette size detection switch 60
1.602 is composed of a plurality of microswitches that are turned on and off according to the insertion of cassettes of different sizes.

The paper P sent to the transfer section comes into close contact with the surface of the photoreceptor drum 10 at the transfer charger 20, so that the toner image on the photoreceptor drum 10 is transferred by the action of the charger 20. . This transferred paper P is transferred to the peeling charger 2
1, the image is electrostatically peeled off from the photoreceptor drum 10 and conveyed by a conveyor belt 22, and is sent to a fixing roller 23 as a fixing device provided at the end of the conveyor belt 22, where the transferred image is transferred. It will be established. Then, paper P after fixing
is arranged to be placed on a tray 25 outside the main body 1 by a pair of paper ejection rollers 24. After the transfer, the photosensitive drum 10 is neutralized by a snow removal electric device 26, residual toner on the surface is removed by a cleaner 27, and an afterimage is erased by a static elimination lamp 28, so that it returns to its initial state. It's starting to go back. Note that 29 is a cooling fan for preventing the temperature inside the main body 1 from rising.

FIG. 7 shows the operation panel 30 provided on the main body 1. 301 is a copy key for instructing the start of copying; 302
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. 306 is a magnification setting key for setting the copy enlargement/reduction magnification in a predetermined relationship, 307 is a zoom key for steplessly setting the enlargement/reduction magnification, and 30a is a display for displaying the set magnification. 30, 30 is a density setting section for setting the copy density, 30a, 30b, and 3QC130d 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 section for inputting the coordinate position indicated by the spot light source. Keys 30f and 30Q are erasing range designation keys for designating erasing ranges at designated positions, respectively.

FIG. 8 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.

A mirror motor 32 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. 35 is 1!
The above-mentioned image motor! This is a motor for driving the developing roller and the like of the II device 12. 36 is the drum motor,
This is a motor for driving the photosensitive drum 10.

A fixing motor 37 is a motor for driving the paper conveying path 22, the pair of fixing rollers 23, and the pair of paper ejecting rollers 24. 38 is a paper feeding motor, which is connected to the feed roller 15.
, 16. 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. 9 shows a drive mechanism for reciprocating the optical system. That is, the mirror 5 and the exposure lamp 4 are supported by a first carriage 411, and the mirror 6.7 is supported by a second carriage 422, respectively, and these carriages 411 and 412 are guided by guide rails 421 and 422 in the direction of arrow a. It can be moved in parallel. That is, the four-phase pulse motor 33 drives the pulley 43. An endless belt 45 is stretched between the pulley 43 and the idle pulley 44, and one end of a first carriage 41 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 and the first. The carriage 411 moves, and the second carriage 422 also moves accordingly. At this time, since the pulleys 47 and 47 serve as movable pulleys, the second carriage 422 is in one position relative to the first carriage 411.
move in the same direction at a speed of 72.

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, the copyable range (X, V),
X/K''.

It becomes ry-Py/KJ. This copyable range (X.

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

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

Further, the first carriage 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 301 is pressed, the first
The carriage 411 is first moved toward the second carriage 412, and then the lamp 4 is turned on and the carriage 411 is moved away from the second carriage 412. When scanning of the original is completed, the lamp 4 is turned off and the first carriage 411
is returned to the home position.

FIG. 11 shows the overall control circuit, in which the main processor group 71 and the first . 2nd subprocessor group 72.73
It is mainly composed of. The main processor group 71 detects inputs from the operation panel 30 and input devices 75 such as various switches and sensors, such as the cassette size detection switch 6 (h, 602), and a high voltage transformer 76 that drives the various chargers; The static elimination lamp 28, the blade solenoid 27a of the cleaner 27, the heater 23a of the fixing roller pair 23, the exposure lamp 4, and each of the motors 31 to 40.58 are controlled to perform the above-described copying operation, and the spot light 11131 is controlled. , pulse motor 135, memory 140, erase array 150,
It controls the array drive unit 160 and the like to perform an operation of erasing unnecessary portions of the document. Note that the spot light source 131, pulse motor 135, erasing array 150, array driving section 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. Then, from the main processor group 71 to the first and second sub-processor group 7
Drive and stop commands for each motor are sent to 2.73, and
．． A status signal indicating the drive/stop state of each motor is sent from the second sub-processor group 72, 73 to the main processor group 71. Further, the first sub-processor group 72 receives position information from a position sensor 83 that detects the initial positions of the motors 31 to 34.

FIG. 12 shows an example of the configuration of the main processor group 71. That is, 91 is a one-chip microcomputer (hereinafter simply referred to as microcomputer), which detects human input of keys on an operation panel (not shown) and controls various displays 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 its value input are connected to the input/output port 94.
A copy condition setting switch and its value input are connected to the input/output port 95. Note that the input/output boat 96 is for oblayon.

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

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

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

112 is a programmable interval timer for the phase switching interval time system of the pulse motor;
By setting a set value from 1, it counts based on it, and outputs an end pulse when the count is out. This end pulse is latched by the latch circuit 113, and its output is supplied to the interrupt line of the microcomputer 111 and the input/output port input line. Further, an input/output boat 114 is connected to the microcomputer 111, and motors 36, 38, 39, and 58 are connected to the input/output boat 114 via the pulse motor driver 80.

Figure 15 shows the control circuit of the pulse motor, and shows the input/output boat 121 (input/output boat 1 in Figures 13 and 14).
04.114) has a pulse motor driver 122
(Equivalent to pulse motor driver 79.80 in Figure 11)
A pulse motor 123 (the pulse motors 31 to 34, 36, 3) is connected to this pulse motor driver 122.
8.39) are connected.

Figure 16 shows a method for controlling the speed of a pulse motor.

Figure (a) shows the speed curve of the pulse motor, and Figure (b) shows the speed curve of the pulse motor.
) indicates the phase switching interval. As is clear from this figure, the phase switching interval is initially long, gradually shortens, eventually becomes equal, becomes gradually longer again, and then stops. 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, tt,
t2...tx indicates the time of the phase switching interval.

Next, the document image erasing means will be explained.

17 and 18, the first carriage 411 is provided with a guide shaft 130 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 for marking the erasing range of the document. Spot light 81 as a means of giving instructions
131 is movably provided. As shown in FIG. 18, this spot light source 131 consists of a light-emitting element 132, such as a light-emitting diode or a lamp, and a lens 133, which are provided facing the document table 2. The light generated by the light-emitting element 132 is 133, the document table 2 is irradiated with a spot light having a diameter d. This spot light has a brightness that allows it to pass through the document G set on the document table 2, which is, for example, as thick as a postcard. In addition, the spot light source 131 is connected to the guide shaft 13.
It is connected to a timing belt (toothed belt) 134 disposed along 0. This timing belt 13
Pulley 13 provided on the rotating shaft of 4-pulse motor 135
6 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. Also, a 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 source 131. For example, when the spot light source 131 is moved, the spot light source 131 first comes into contact with the position sensor 138 to detect the initial position. The location is now detected.

Next, using FIGS. 19 to 21, the above-mentioned spot light 1
A method of specifying the erasure 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 operation keys 308 to 30d described above 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 3
3 is driven, and the first carriage 411 and the spotlight 11131 are moved in the scanning direction (arrow y direction shown in FIG. 19). Also, if you press the operation keys 30a and 30C,
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. 19). The operator operates the operation keys 30a to 30d while visually observing the spot light transmitted through the document G.
0. With the spotlight moved to point S1 on the document G shown in FIG. 0(a), the position designation key 301B is pressed. 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 determined by the pulse motor 3, for example.
It can be detected by counting the number of drive pulses of 3.135. Thereafter, when the erasure range designation key 30f is pressed, a rectangular area (indicated by diagonal lines) having the 81.32 rotation as a diagonal point is designated as the erasure range, as shown in FIG. 20(a). Also, as shown in FIG. 20(b), if you specify points 83 and 84 on the original G and press the erase range designation key 30Gl, the area other than the square with 83 and 84 points as diagonal points will be set as the erase range. It is specified. In this way, the erasure range specification key 30f.

When 300 is pressed, the main processor group 71 performs calculations based on the specified two point positions and the copying magnification, and a high level signal "1" is stored in the memory 140 in the erase range.
", and the low level signal no" is stored in the other portions. 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. 20(a), Fig. 21<a)
In the case of FIG. 20(b), as shown in FIG. 21(b), a high level signal is stored in the address corresponding to the shaded area, and a low level signal is stored in the other addresses. It is now possible to do so.

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, as shown in FIG. 21, the information stored in the memory 140 is also actually stored with the information reversed in the direction of the bow.

On the other hand, as shown in FIG. 22, an erasing array 150 serving as erasing means is provided close to the photosensitive drum 10, for example, between the charger 11 and the exposure section ph. As shown in FIGS. 1 and 2, 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 inside each of these light-shielding cells 151. A light emitting element 152 made of a light emitting diode, for example, as shown in FIGS. 3(a) and 3(b) is provided. Furthermore, a lens 153 that focuses the light from the light emitting element 152 onto the surface of the photoreceptor drum 10 is provided at the entrance of each cell 151 facing 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,
Assuming that the distance between the light emitting elements 152 is P and the number of elements 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. 23, this array driving section 160 includes a shift register 161 having the same number of bits as the number of pits in the column direction of the memory 140, a store register 162 that holds the contents of this shift register 161, and a store register 162 that holds the contents of this shift register 161. 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 the door register 162, and the movable contact pieces 163a of these switch elements 163 are grounded.
The fixed contacts 163b are connected to each cathode of the light emitting elements 152 constituting the erasing array 150, respectively.

The anode of each of these light emitting elements 152 is a current limiting resistor R
are connected to the power supply VCC through the respective terminals.

After specifying the erase range of the original as described above, when the original cover 11 is closed and the copy key 3Ch is pressed, the first carriage 411 and the photosensitive drum 10 are operated, and the memory 140 is read in the row direction. One column of data is sequentially read out (as shown in FIG. 21). This read data D1 is transferred to the shift register 161 of the array driving section 160 in response to the clock signal CLK.

After one column of data is transferred to the shift register 161, the charged portion of the photoreceptor drum 10 is transferred to the erase array 15.
When 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.

In other words, the erasing array 150 has a charge 1111 and an exposed area P.
For example, one row of data output from the memory 140 is arranged between the erase array 1
The angle between 50 and the exposed part ph is 01, and the photoreceptor drum 1
0 is rotating at each speed, the latch signal L is supplied to the store register 162 before θ1/ω.
The output timing of TI-1 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 image is not erased. It means that it was 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 line break pitch of a typical typewriter is
Most of them are 1/6 inch, and in addition 1/4 inch.
1/3 inch is seen, and most of it is occupied by these. Therefore, if the arrangement pitch of the light emitting elements 152 constituting the erasing array 150 is set appropriately, the erasing range indicated by Sa to sb can be completely completed, as shown in FIG. 4(a), for example. The erasing range indicated by Sc to Sd in the figure overlaps the text, and may not be completely erased.

On the other hand, the light emitting elements 1 constituting the erasing array 150
For example, if the arrangement pitch P of 52 is 1/12 inch,
As shown in FIG. 4(b), no matter what the designated erasing range is, erasing will not occur even if the text is covered, making it possible to perform complete erasing.

Furthermore, if the arrangement pitch P of the light emitting elements 152 is 1/12 inch, even if the pitch of the original is 1/4 or 1/3, it corresponds to an integral multiple, so complete erasure is also possible. It is possible to do so.

According to the above embodiment, the arrangement pitch P of the light emitting elements 152 constituting the erasing array 150 is 1/12 inch. Therefore, no matter what line break pitch the original image has, it is possible to completely erase the text without interfering with the text.

Further, if the arrangement pitch is set as described above, it is possible to correspond to any line feed pitch of a document, and therefore it is possible to suppress the number of light emitting elements 152 to the minimum necessary number.

In the above embodiment, the arrangement pitch P of the light emitting elements 152 is set to 1.
/12 inch, but it is not limited to this, for example, 1/24 inch
It is also possible to use inches.

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

[Effects of the Invention] As detailed above, according to the present invention, it is possible to designate and erase any part of a document image, and to form an image that is economically advantageous and allows reliable erasing. equipment can be provided.

[Brief explanation of drawings]

1 and 2 each show an embodiment of an image forming apparatus according to the present invention, with FIG. 1 being a perspective view of the main parts showing the relationship between the erasing array and the photosensitive drum, and FIG. Similarly, FIG. 3 is a front view showing only the main parts, and FIG. 3 shows the configuration of the erasing array. FIG. The reason is that the figures are shown to explain the operation, and FIGS. 5 and 6 show the configuration of the image forming apparatus. FIG. 5 is an external perspective view, FIG. 6 is a side sectional view, and FIG. FIG. 8 is a plan view showing the structure of the operation panel, FIG. 8 is a perspective view showing the structure of the drive unit, FIG. 9 is a perspective view schematically showing the drive mechanism of the optical system, and FIG. 10 is a schematic view of the drive mechanism of the pointer. 11 is a block diagram showing the overall control circuit, FIG. 12 is a block diagram showing the main processor group, and FIG. 13 is a block diagram showing the main processor group.
Figure 14 is a configuration diagram showing the first sub-processor group, Figure 14 is a configuration diagram showing the second sub-processor group, Figure 15 is a schematic configuration diagram showing the control circuit of the pulse motor, and Figure 16 is speed control of the pulse motor. Figures for explaining the method; Figure 17 is a perspective view of the main part showing the spot light source; Figure 18 is a side sectional view of the main part showing the spot light source; Figures 19 and 20 are each a diagram showing the use of the spot light source. FIG. 21 is a diagram for explaining the contents of the memory; FIG. 22 is a side sectional view of the main part showing the arrangement of the erasing array; FIG. 23 24 is a circuit diagram showing the configuration of the array driving section, and FIG. 24 is a side sectional view of the main part showing another example of the arrangement of the erasing array. 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. Applicant's agent Patent attorney Takehiko Suzue Figure 2 (a) (b) Figure 4 Figure 5y! J Prisoner 8, Figure 10, Figure 12, jl14J! 1i Figure 18 Figure 19 Figure 20 (a) Figure 20 Figure 21 (a) (b) Figure 22 Figure 24 Figure 23

Claims (5)

[Claims] (1) The document placed on the document table is optically scanned by a scanning means that moves along the document table, and a reflected light image from the document table is formed on a charged image carrier. In an image forming apparatus that forms an electric charge pattern using a wafer, develops the electric charge pattern, and transfers the electric charge pattern to a transfer material, an indicating means provided in the operating means for indicating a predetermined range of a document using transmitted light; and erasing means for erasing an image corresponding to the image, and the erasing pitch of this erasing means is 1/12
An image forming apparatus characterized in that the image forming apparatus is set to n inches (n is an integer). (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 erasing means comprises a plurality of light emitting elements arranged along the image carrier. (4) The image forming apparatus according to claim 1, wherein the pitch is 1/12 inch. (5) The image forming apparatus according to claim 1, wherein the pitch is 1/24 inch.