JPS61219973A - Image forming device - Google Patents

Abstract

PURPOSE:To erase an optional part of an original by providing a control means for limiting an erasing range by an erasing means in accordance with the turn- over direction of the original, which has been selected by a selecting means. CONSTITUTION:When the original G is selected so as to be turned over in the parallel direction to the scanning direction by a turn-over direction selecting key 30i, the original G is set along the second fixed scale 22 with its copy surface turned upward. In this case, a carriage 411 and a spot light source 131 are moved in the scanning direction (y). Subsequently, when an erasing range indicating key 30f is depressed, an area (an oblique line part) in which joints S1, S2 are diagonal points is designated as an erasing range. Next, the original G is turned over in the direction (y) at the time of copying, and set along the first fixed scale 21. In this state, the designated erasing range is calculated by a main processor group, stored in a memory, and in an electrified part of a photosensitive drum, the erasing range in which a light emitting element has been lighted is destaticized, an electrostatic latent image is not formed, and an erasion of an original image is executed.

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 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.

[Purpose of the invention]

This invention was made based on the above circumstances, and its purpose is to create an image by erasing any part of a document image using a simple table structure, and to provide an image with excellent operability. The present invention aims to provide an image forming apparatus.

[Summary of the invention]

In this invention, for example, a spot light is irradiated onto a document image, an erasing range is specified by moving the spot light, and a photosensitive drum is irradiated with light in accordance with the designated erasing range, thereby making it static. An image is formed by erasing an electrostatic latent image or charge, and when specifying the area to be erased, place the original on the document table with the copy side facing up, and then turn the original over when copying. The present invention is characterized in that it has a configuration in which the direction in which the document is turned over can be selected.

[Embodiments of the invention]

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

FIGS. 14 and 15 schematically show an image forming apparatus, such as a copying machine, according to the present invention. Specifically, reference numeral 1 denotes a main body of a copying machine, and a document table 2 (transparent) for supporting a document is fixed to the upper surface of the main body 1. This manuscript table 2
At both ends in the longitudinal direction are the first and second rows, which serve as the reference for setting the original. A second fixed scale 21p22 is provided. Further, near the document table 2, a document cover 11 and a work table 12, which can be opened and closed, are provided. The original set on the original platen 2 is moved by the optical system consisting of an exposure run f4 and mirrors 5, 6.7 reciprocating along the lower surface of the original platen 2 in the direction of arrow a. Exposure scanning is performed during reciprocation. In this case, mirror 6.2 moves at half the speed of mirror 5 so as to keep the optical path length constant. The light reflected from the original by the scanning of the optical system and the light reflected from the original by the light irradiation of the pick exposure lamp 4 are reflected by the mirrors 5, 6.7, and then passed through the variable magnification lens Glock 8. The light is reflected by mirror 9 and guided to photoreceptor drum 10, so that the edge of the document is imaged on the surface of photoreceptor drum IO.

The photosensitive drum 10 rotates in the direction of arrow C, and its surface is first charged by the charger 11, and then the image of the document is exposed to slit light to form an electrostatic latent image. The latent image is made visible by applying toner by a developing device 12. - 10,000 sheets of paper (image forming object) P are taken out one by one from the selected upper paper feed cassette 13 or lower paper feed cassette 14 by the feed rollers 15 or 16, and are taken out from the paper guide path 17.
Alternatively, it is guided to a pair of V-no rollers 19 through a roller pair 18, and sent to a transfer section by a pair of rollers 19. Here, each of the paper feed cassettes 13 and 14 is
The layer is removably provided at the lower right end of the main body 1, and one of the four channels can be selected (1, operation to be described later). In addition, each of the above paper feed cassettes 13, 14
are cassette size detection switches 601 and 602, respectively.
The cassette size is detected by this. This detection Nuite 601, 60. has multiple microswitches that are turned on and off depending on the insertion of cassettes of different sizes,
It is composed of many parts.

- 10,000, the paper P sent to the transfer section comes into close contact with the surface of the photosensitive drum 1o at the transfer charger 20, so that
The toner image on the photosensitive drum 10 is transferred by the action of the charger 2o. The transferred paper PFi is peeled off from the photoreceptor drum 10 by the action of the peeling charger 2, conveyed on the conveyor belt 22, and sent to a pair of fixing rollers 23 as a fixing device provided at the end of the conveyor belt 22. By passing through this, the transferred image is fixed. Then, the paper PE after fixing
The paper is discharged onto a tray 25 outside the main body 1 by a pair of paper discharge rollers 24. After the photosensitive drum 1° has been transferred, the charge is removed by the charger 26, the residual toner on the surface is removed by the cleaner 27, and the residual image is erased by the charge removal run f2B so that the drum returns to its initial state. It has become. Note that 29 is a cooling fan for preventing the temperature of the main body from increasing by 1 yen.

FIG. 16 shows the operation t4 channel 30 provided on the main body 1. 301 is a copy key for instructing the start of copying;
02 is a numeric keypad for setting the number of copies, etc.; 303 is a display unit that displays the operating status of each part, paper size, etc.;
04 is a cassette selection key for selecting the upper and lower paper feed cassettes 13 and 14; 3θS is a cassette display section for displaying the selected cassette; 306 is a magnification setting key for setting the copy enlargement and reduction magnification in a predetermined relationship; 30T is a zoom key for steplessly setting the enlargement/reduction magnification; 308 is a display section for displaying the set magnification; 309 is a density setting section for setting copy density; 30. 30. ．． 30c, 30. 30. are operation keys for moving a spot light source indicating the erasing position of the document, which will be described later; 306 is a position specification key for inputting the coordinate position indicated by the spot light source; 30. 30g is an erasure range specification key for specifying the erasure range at a designated position, 30h, 30. Reference numeral denotes a flipping direction selection key for selecting the flipping direction of the document, and 30j and 30 are flipping direction display sections that display the selected flipping direction.

FIG. 17 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 glock 8 for changing the magnification. Reference numeral 32 denotes a mirror motor for changing the distance (optical path length) between the mirror 5 and the mirror 6°7 for zooming. 3
3 is a scanning motor, which connects the exposure lamp 4 and mirror 5;
．． This is a motor for moving 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. A drum motor 36 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.

A paper feeding motor 38 is a motor for driving the delivery rollers 15 and 16. 39 is a paper feed motor;
This is a motor for driving the registration roller pair 19. A fan motor 4o is a motor for driving the cooling fan 29.

FIG. 18 shows a drive mechanism for reciprocating the optical system. That is, the mirror 5 and the exposure run f4 are placed in the first carriage 411, and the mirror 6.7 is placed in the second carriage 41. 1 and 421.4 to these carinno 411° 41z/li guide L/-
29 K is guided so that it can move freely in parallel in the direction of arrow a. That is, the four-phase 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 for supporting the mirror 5 is fixed to the middle part of the belt 45.

- 10,000, rail 42 of the second carriage 412 supporting the mirror 6.7. A wire 48 is stretched between a wire 142 and two pulleys 47 degrees 47 spaced apart in the D-axis direction. One end of this wire 48 is connected to a fixed part 49, and the other end is connected to a coil. Doi fixing part 49 via sedge ring 50
Each VC is fixed. Also, a first carriage 41 is located in the middle of the wire 48! One end is fixed. Therefore, as the rotary motor 33 rotates, the belt 45 rotates, the first carriage 411 moves, and the second carriage 412 also moves accordingly.

At this time, since the wheels 1747 and 47 act as movable pulleys, the second carriage and the first carriage move in the same direction at 1/2 the speed of the first carriage 411.

In addition, 1. The moving direction of the second carissos 411 and 412 is 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, if the paper size specified by the paper selection key 304 is (Px e P)') and the copy magnification specified by the magnification setting keys 306 and 30° is K, then the copyable range (x, y) is x = Px / K y = Py /. Of this copyable range (x, y), the X direction is indicated by the pointer 51°52 provided on the back side of the document table 2, and the y direction is indicated by the pointer 51°52 provided on the upper surface of the first carrier 411. It is displayed using a scale 53.

As shown in FIG. 19, the above-mentioned pointers 51 and 52
, 55 via a spring 56.

The pulley 55 is configured to be rotated by a motor 58, and the motor 58 is driven in accordance with the paper size and magnification, thereby changing the distance between the guides 51 and 52. .

Further, the first cartridge 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 30 is pressed, the first
First of all, Kyaritsuso 411 is the second Kyari, ㅅ41! After that, the run f4 is turned on and moved in the direction away from the second barrel 412.

When scanning of the original is completed, the lamp 4 is turned off and the first lamp is turned off.
Carrino 411 is returned to the home position.

FIG. 20 shows the overall control circuit, in which the main processor group 71 and the first . 2nd sub-process, group 72, 73
It is mainly composed of. The above-mentioned main glossary, group 7, includes an operation panel 30 and various sensors such as the skein, size detection switch 603, 60.
A high-voltage transformer 76 that detects input from an input device 75 such as and drives the various chargers, the static elimination run f2g, and the root solenoid z of the cleaner 27;7. , the heater 23 of the pair of fixing rollers 23, the exposure rung 4, and each of the motors 30 to 40.58 are controlled to perform the above-described copying operation, as well as the spot light source 131, laser motor 135, and eraser. The array 15o1 controls the array drive unit 160, memory 140, etc. to erase unnecessary portions of the document. In addition, the spot light source 131, /
4? The Lunu motor 135, erase array 150, array driver 160, and memory 140 will be described later.

Among the above motors 31 to 40.58, motor 35.37
．． 40 and a toner 7 for supplying toner to the developing device 12
7 is controlled by a main processor group 71 via a motor driver 78, motors 31 to 34 and 135 are controlled by a first processor group 72 via a pulse motor driver 79, and motors 36, 39, 313°58 are controlled by a first processor group 72 via a pulse motor driver 79. ,
It is controlled by the second processor group 73 via the pulse motor driver 80. Further, the exposure run f4 is controlled by the main processor group 71 via the lamp regulator 81, and the heater 23m is controlled by the main processor group 71 via the heater control section 82. Then, from the main processor group 71, the first. Commands to drive and stop each motor are sent to the second group 72 and 73, and the first group 72 and 73 are sent commands to drive and stop each motor. Statuses indicating the drive and stop states of each motor are sent from the second output groups 72 and 73 to the main processor group 71.

The first subgross setter group 72 also includes motors 31 to 3.
Position information from a position sensor 83 that detects each initial position of 4 is input.

FIG. 21 shows an example of the configuration of the main processor group 7. That is, 91 is a one-chip microcomputer (hereinafter simply referred to as microcomputer), which performs operations (not shown), human power detection of keys on the buttocks, various display controls, etc. via an input/output port 92. Furthermore, the microcomputer 91 is expanded with input/output ports 93-96.

The input/output port 93 is connected to a high voltage transformer 76, motor driver 78, rung regulator 81, and other outputs, and the input/output port 94 is connected to a size unit for detecting paper size and its individual inputs. - port 95 is connected to a copying condition setting switch and its extraction input. The input/output port 96 is for input/output.

Is Figure 22 M1? An example of the configuration of the process group 72 is shown. 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; when a setting value is set from the microcomputer 101, it counts based on it; and when it has counted out, the microcomputer 101 indicates the end time. output to the interrupt line. A reference clock/IP pulse is input to the timer 102. Also, microcomputer 101
, to which position information from the position sensor 83 is input and input/output ports 103 and 104 are connected.

The motors 31 to 34.135 are connected to the input/output port 104 via the main motor driver 79. Note that the input/output port 103 is used, for example, when outputting the stator number 748 of each No. 9 motor to the main processor group 71.

FIG. 23 shows an example of the configuration of the sub-processor group 73. That is, there are 111 microcomputers, which are connected to the main processor group 71. Reference numeral 112 is a programmable interval timer for controlling the phase switching interval time of the Nockles motor.When a setting value is set from the microcomputer 111, it counts based on it, and outputs a termination signal when the count is out. do.

This end pulse is latched by the TE circuit 113, and its output is connected to the interrupt line of the microcomputer 111 and the input/output yl? - A cutlet line with a cutter is supplied. Further, an input/output port 114 is connected to the microcomputer 111, and a motor 36.degree.

Figure 24 shows the control circuit of the pulse motor, and shows the input/output port 121 (input/output port 1 in Figures 22 and 23).
04,114) is /f Lus Motor Dry t#
122 (20th E) i4 Luz motor driver 79.
80) is connected to this No.9 motor dryer nose 122, and an arm motor 123 (equivalent to the arm motors 31 to 34 #36, 38, 3911C) (D each
A, A, B.

B is connected.

! Figure 25 shows the AI pulse motor speed control method, (a) shows the speed curve of a 14 pulse motor, (b)
The figure shows the phase switching interval. As is clear from this figure, the phase switching intervals are long at first, gradually shorten, eventually become equal intervals, gradually become longer again, and then stop. That is, this is No4/I/Smoter's through7. It shows f and through-down, starting from the self-starting region, being used in the high-speed region, and then falling. Furthermore, if t
t2...t indicates the time of the phase switching interval.

Next, regarding the function of specifying and erasing the erasing range of the original, "C"
explain. In FIGS. 26 and 27, the first gear,
A guide shaft 130 is provided along the rung 4 in the part where the light of the rung 4 is blocked, and a spot light source 131 as a means for indicating the erasing range of the original is moved on the guide shaft 130. It is set freely. As shown in FIG. 27, this spot light source 1311d consists of light emitting elements 132 and 133, such as light emitting diodes and rungs, which are provided opposite to the document table 2.
The light UV lens 133 generated by the UV lens 32 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) 1 disposed on the guide shaft 130.
It is connected to 34. This timing 134 is passed between a pulley 136 and a driven pulley 137 provided on the rotating shaft of the flat-rotated motor 135. Therefore, by rotating the notarus motor 135, the syspot light source 13 is moved in a direction perpendicular to the scanning direction of the first carriage 411. In addition, the first shaft 411 located at the end of the arm of the guide shaft 130 on the side of the arm motor i 35
A micro switch 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 and its initial position is detected.

Next, using FIGS. 1 to 7, the spot light source 131
This section explains how to specify the erasing range of a document using .

Here, the flipping direction selection key 30h is used to set the document G on the document table 2 with the copy side facing upward.

This is used when copying is performed by flipping the original G in a direction perpendicular to the scanning direction after specifying the erasing range.
This is used when the original G is set on the original table 2 with the copy side facing upward, the erasure range is specified, and then this original G is turned over in a direction parallel to the scanning direction to make a copy.

First, when the case where the original G is turned over in a direction parallel to the scanning direction is selected using the turning direction selection key 30i, the original G is turned over with the copy side facing upward, as shown in FIG.
Fixed scale 2! It is set cleanly. At this time, the first carriage 4 is stopped at a position indicating a copyable range corresponding to a predetermined copying magnification. Furthermore, the dimension W between the first and second fixed scales 21t21 is generally somewhat larger depending on the maximum document size. For example, if the maximum original size is A3, the long side of this original is 420cm, so the first. The dimension W between the second fixed scales 21m22 is W=420+α. If the document is A4', it is half of FiA3, so if the long side of the A4 document is t, =210, the dimension W is set as w=2t0+α.

In this state, when the aforementioned operation keys 301 to 30d are operated, the spot light source 131 is moved. That is,
When the operation key JOB # 304 is pressed, the motor 33 is driven, and the first cylinder 411 and the spot light source 1 are activated.
31 is moved in the scanning direction (arrow y direction shown in Figure 1!1). In addition, the operation key 30. ．． 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. 1).

The operator presses the operation keys 30 to 30 while visually observing the spot light transmitted through the document G. , and press the position designation key 301 while moving the spotlight to, for example, 81 points on the document G shown in FIG. Then, the coordinate position specified by S 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. For example, the position of this spot light is t.
It can be detected by counting the number of pulses. After this, erase range specification key 30. When you press , 5lpS! as shown in Figure 2 (,)! A rectangular area (indicated by diagonal lines) with the points as diagonal points is designated as the erasing range. In addition, as shown in FIG. 2(b), 83
Point Is, specify the point and erase range specification key 30. When you press 83 @ S, the area other than the square with the four diagonal points is specified as the erasing range. In this way, the original G for which the erasure range has been specified is y
It is turned over and set along the first fixed scale 21.

By the way, the erasure range specification key 30. ．． When 30g is pressed, the main processor group 71 performs calculations based on the positions of the two designated points, and the memory 140 stores a high level signal "1" in the erase range area and a low level signal ``in other areas. 01 is stored, that is, this memory 14
0, for example, the capacitance in each column direction is approximately equal to the movement distance of the spot light source 131 in the It is constituted by a RAM whose positional image level is almost the same as that of the main processor group 71, and in the case of FIG.
As shown in a), and in the case of Fig. 2(b), as shown in Fig. 4(b), high level signals are stored in the addresses corresponding to the shaded areas, and low level signals are stored in the other addresses. It is now possible to do so. In this case, as described above, when copying, the original is turned over in the y direction, and the first fixed scale 2
1 and G, the designated erasing range is rotated in the y direction on the document table 2 with the y direction center being the center. Therefore, the y-direction storage addresses of high level signals and low level signals are also converted accordingly, and predetermined signals are stored in accordance with the converted addresses.

Next, when the case of flipping the original G in a direction perpendicular to the scanning direction is selected using the flipping direction selection key 30h, the original Gd is turned over with the copy WJ facing upward as shown in FIG.
It is set along the fixed scale 21.

In this state, the operation keys 308 to 30. When operated, the spot light source 131 is moved. That is,
When the operation keys 30 b e 30 d are pressed, the motor 33
is driven, and the first carriage 411 and spot light source 131 are moved in the scanning direction (arrow y direction shown in FIG. 5). In addition, the operation key 30. ．． 301. When 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. 5). The operator presses the operation keys 30. while visually viewing the transmitted light. ~30. , and press the position designation key 30° while moving the spotlight to a point Si on the document G shown in FIG. 6(,), for example. 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 30 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 motors 33, 1, for example.
This can be detected by counting the number of driving elbows. Thereafter, when the erasure range designation key 30f is pressed, a rectangular area (indicated by diagonal lines) with the <St*S* point as the diagonal point is designated as the erasure range, as shown in FIG. 6(,). Also, as shown in FIG. 6(b), the point S and ps of the original G
Specify 4 points and press the erase range designation key 30. Press 83
．． The area other than the square with 84 diagonal points is designated as the erasing range.

As a result, the original G with the designated erasing range is turned over in the X direction as shown in FIG. 7 at the time of copying, and is set along the first fixed number 25.

In this case, when copying, the original is turned over in the X direction and set along the first fixed scale 21, so the specified erasing range is centered on the center of the X direction on the document table 2. It has been returned. Therefore, the X-direction storage addresses of high level signals and low level signals are also converted accordingly, and predetermined signals are stored in accordance with the converted addresses.

On the other hand, as shown in FIGS. 81 and 8, an erasing array 150 as an erasing means is provided close to, for example, between the charger 11 of the photosensitive drum 10 and the exposure section phO. As shown in this erase array As shown in (b), a light emitting element 152 such as a light emitting diode is provided. Further, a light emitting element 153 is provided in an opening of each cell 151 facing the photoreceptor drum 1o. The number of light emitting elements arranged in this erasing array 150 is determined by the memo 91, for example.
It is matched with a column direction capacity of 40. Here, if the distance between the light emitting elements 152 is P and the number is t-N, the total length of the erasing array 150 is expressed as Q=NXP.

The erase array 150 is driven by the array driver 160 described above. This array drive unit 160Fi 12th
As shown in the figure, 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 16 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, and the movable contact piece 1631 of these switch elements 163 is grounded, and the fixed contact 163° are connected to each cathode of a light emitting element (light emitting diode) 152 constituting the erase array 150, respectively. The anodes of each of these light emitting elements 152 are connected to the power source vce through current limiting resistors R, respectively.

Then, as described above, specify the erase range of the original, turn the original over, and select the first fixed scale 2! After setting the document along the directions, close the document cover 11 and press the copy key 30.
First, the first scale 411
moved in the direction. After this, the first carriage 41x#-
It is moved in a direction away from the i-first fixed scale 21, and the photosensitive drum 10 is operated accordingly. When these are operated, data for one column is sequentially read out from the memory 140 in the row direction.

The read data D1 is transferred to the shift register 161 of the array driving section 160 using the black signal CLK. After one column of data has been transferred to the shift register 16, when the charged portion of the photosensitive drum 10 reaches the erase array 150, a latch signal LTH is output from the main group 71, and the latch signal LTH is output in response to this signal. The contents of shift register 161 are then supplied to store register 162. That is, the erase play 150 is connected to the charger 11 and the exposure section ph.
For example, the angle between the erasing array 150 and the exposure section ph is θ! Assuming that the photosensitive drum 1o is rotating at an angular velocity ω, the latch signal LT is supplied to the store register 162 before θ1/ω.
The output timing of H is controlled. Further, each switch element 163 of the switch circuit 164 is controlled by each output signal of this store register 162. In other words, when the output signal of the store register 162 is at a high level, it is turned on, and when it is at a low level, it is turned off. It will be lit if it is on, and it will be off if it 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. When such a copying operation is completed, the first carriage 41 is stopped at a position indicating the image forming range.

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

Further, when copying the original G after specifying the erasure range of the original G, the direction in which the original G is turned over can be selected from either the X direction or the y direction, which provides excellent operability.

Furthermore, when specifying the erasure range, you can place the original on the document table 2 with the copy side facing up, and then specify it while visually viewing the original using a spot source that passes through the original, making the specification operation easy. It is easy to confirm the erased range.

Further, since the first carriage 411VC spot light source 131 is provided, the NuPase can be used effectively and it is possible to suppress the increase in size of the apparatus.

It should be noted that this invention is not limited to the above embodiments.

For example, the arrangement position of the erasing array 150 is not limited to between the charger 11 and the exposure section ph shown in FIG. It is also possible to configure the electrostatic latent image to be erased according to a designation.

Furthermore, the capacity of the memory 140 can also be changed as required.

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

〔Effect of the invention〕

As described in detail above, according to the present invention, it is possible to provide an image forming apparatus that can form an image by erasing any part of a document image with a simple configuration and has excellent operability.

[Brief explanation of the drawing]

FIGS. 1 to 12 show an embodiment of the main part of the image forming apparatus according to the present invention, and FIGS. 1 and 2 show an example of erasing range specification of an original using a light source, respectively. 3 is a plan view shown to explain the operation, FIG. 3 is a perspective view shown to explain the direction of reversing the document, FIG. 4 is a view shown to explain the contents of the memory, and FIGS. 5 and 6 are FIG. 7 is a plan view showing the operation of specifying the erasing range of an original using a spot light source, FIG. The side sectional view of the main parts shown in FIG. 9 and FIG. 1O respectively show the relationship between the erasing play and the photosensitive drum.
Fig. 9 is a perspective view showing only the main parts, Fig. 1O is a front view showing only the main parts, Fig. 11 shows the configuration of the erasing array, and Fig. (b) #'i A partially cutaway front view, FIG. 12 is a circuit configuration diagram showing the configuration of the play drive section, and FIG. 13 is a side sectional view of the main part showing another example of the arrangement of the erase array. , i@ Figure 14 and Figure 15 show the configuration of the image forming apparatus, Figure 14 is an overview perspective view, and jJ! FIG. 15 is a side sectional view, FIG. 16 is a plan view showing the configuration of the operating armpit, FIG. 17 is a perspective view showing the configuration of the drive section, and FIG. 18 is a perspective view schematically showing the drive mechanism of the optical system. 19 is a perspective view schematically showing the drive mechanism of the pointer,
Fig. 20 is a block diagram showing the overall control circuit, Fig. 21 is a block diagram of the main processor group, Fig. 22 is a block diagram of the first subgross group, and Fig. 23 is a block diagram of the second subgross group. FIG. 24 is a schematic configuration diagram showing the control circuit of the Norse motor, FIG. 25 is a diagram for explaining the speed control method of the pulse motor, FIG. 26 is a perspective view showing the spot light source, and FIG. The figure is a side sectional view showing a spot light source. 1...Copy machine main body, 2...Original table, 21e22"・
・First. ! 2 fixed scale, 10...photosensitive drum,
30-30. ...Operation key, 30e...Position designation key, 30, . 30g...Erase range specification key, 30h,
30°... Document flipping direction selection key, 33... Scanning motor, 411... First camera, 71... Main processor, group, 131... Spot light source, 132
...IX child, Jss...lens, 135...
4' Le, X Motor, 150... Erasing array, 1
52... Light emitting element, 153... Lens, 160...
・Array drive unit, 140... Mesori, P... Paper,
ph-...Exposed part. Applicant's Representative Patent Attorney Takehiko Suzue Figure 1 Figure 2 (a) Figure 2 Cause 3 Figure 4 (a) (b) Figure 5 Figure 7 Figure 6 (a) Figure 6 Figure 8 Figure 131Z Figure 9 Figure 10 Figure 11 Figure 12 Figure 14 Prisoner Figure 17 M22 Figure 23

Claims (1)

[Claims] A document placed on a document table is optically scanned, a reflected light image from the document is focused on a charged image carrier to form a charge pattern, and after this charge pattern is developed, it is transferred. In an image forming apparatus that forms an image by transferring and fixing it onto a material, an indicating means is provided in the scanning means and directs a predetermined range of a document by irradiating a spot light when specifying a range, and a portion corresponding to the specified range. is provided with an erasing means for erasing the charges during image formation, and after specifying the range with the side of the document to be scanned facing up, the document is turned over,
The configuration is such that image formation is performed with the side to be scanned of the document facing backward, and further includes a selection means for selecting a direction in which the document is turned over, and an erasing means according to the direction in which the document is turned over selected by the selection means. An image forming apparatus comprising: a control means for controlling an erasing range.