JPS61223860A - Image forming device - Google Patents

Abstract

PURPOSE:To prevent malfunction of a image forming device, by designating an erasing extent by moving a spot light and easing the charge of a photosensitive drum correspondingly to the designated erasing extent, and then, preventing the movement of the spot light beyond the copyable limit of an object to be copied. CONSTITUTION:When an erasing extent is designated by operating operation keys 30a-30d, the extent shown by the oblique lines in the figure is the copyable extent when, for example, an original of A-3 size is copied at the unmagnification. When an original of A-4 size is copied by enlarging the original to 141%, the part shown by the oblique lines goes to the copyable extent. Movement of a spot light source 131 beyond the copyable limit is prevented. Moreover, when the spot light source 131 moves to the limit of the copable extent, the light source 131 blinks. Therefore, such a malfunction that the outside of the copyable areas is designated as a copying extent can be prevented.

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]

In general, an electronic copying machine has the function of copying an original image directly onto paper 9 or enlarging or reducing the original image to make a copy.

Therefore, 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,
The purpose is to provide an image forming apparatus that can specify and erase any part of a document image, and can only specify within the image forming range of the document. It is.

[Summary of the invention]

This invention, for example, irradiates a spot light onto an original image, moves this spotlight to specify an erasing range, and irradiates a photoreceptor drum with light corresponding to the designated erasing range to form an electrostatic latent image. Or it is one that erases the static charge and makes copies.
In particular, it is characterized in that the spotlight does not move outside the copyable range.

[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 2□ which serves as a reference for setting and placing the document, and furthermore, near the document table 2, there is a document force /4 J l that can be opened and closed and a work table 1. is provided.

The original set on the original platen 2 is exposed by an optical system consisting of an exposure rung 4 and mirrors 5, 6.7 reciprocating along the lower surface of the original platen 2 in the direction of arrow a.
During the reciprocation, the exposure movement is carried out. In this case, mirror 6.7 moves at the speed of the rod 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, that is, the light reflected from the original by the light irradiation of the exposure rung 4, is reflected by the mirrors 5, 6, and 7, passes through the variable magnification lens block 8, and then passes through the mirror. 9 and guided to the photoreceptor drum 10, so that an image of the document is formed on the surface of the photoreceptor drum 10.

The photosensitive drum 10 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. is made visible by applying toner by a developing device 12. On the other hand, the paper (image forming object) P is transferred from the selected upper paper feed cassette 13 or lower paper feed cassette 14 to the delivery row 2.
16 or 16, one sheet at a time is taken out, and the paper guide path 17
Alternatively, the recording medium is guided through the recording medium 18 to a pair of registration rollers 19, and sent to a transfer section by the pair of rollers 19. Here, each of the above-mentioned paper feed cassettes 13 and 14 is as follows.
It is detachably provided at the lower right end of the main body 1, and either one can be selected in the operation AI channel described later. In addition, each of the above paper feed cassettes 13 and 14
are respectively cassette size detection switches 60. ．． 60.
The cassette size is detected by This detection switch, Chiro 01.60. is composed of a plurality of microswitches that are turned on and off according to the insertion of cassettes and trays of different sizes.

On the other hand, the paper P sent to the transfer section is transferred by being brought into close contact with the surface of the photoreceptor drum 10 at the transfer charger 20.
The toner image on the photosensitive drum 10 is transferred by the action of the charger 20. The transferred paper P is peeled off from the photoreceptor drum 10 by the action of the peeling charger 21 and conveyed on the conveyor belt 22, and sent to a pair of fixing rollers 23 as a fixing device provided at the terminal end of the conveyor belt 22. By passing through this, the transferred image is fixed. Then, the paper P after fixing is
The paper is discharged to a tray 25 outside the main body 1 by a pair of paper discharge rollers 24. Further, 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 the afterimage is erased by the charge removal lamp 28, so that the drum 10 returns to its initial state. ing. 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; 308
30 is a numeric keypad for setting the number of copies, etc. 304 is a display section that displays the operating status of each section and paper jams, etc.;
30s is a cassette selection key that selects the upper and lower paper feed cassettes 13 and 14; 30s is a cassette display section that displays the selected cassette; 30. Reference numeral 30 denotes a magnification setting key for setting the enlargement or reduction magnification of copying in a predetermined relationship; 30 denotes a zoom key for steplessly setting the enlargement or reduction magnification; 301 denotes a display section for displaying the set magnification; 30. 30h, 30b #30c, 30d are operation keys for moving a spot light source indicating the erasing position of the original, which will be described later; 30e is a position specifying key for inputting the coordinate position indicated by the spot light source; S.O.T.

sog is an erasure range specification key that specifies the erasure range at each designated position.

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 changing the magnification. 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. 33
is a scanning motor, which connects the exposure rung 4 and the 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 36 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.

38 is a paper feed motor, which is a motor for driving the delivery roller x5.16. 39 is a paper feed motor;
This is a motor for driving the registration roller pair 19. A fan motor 40 is a motor for driving the cooling fan 29.

FIG. 7 shows a drive mechanism for reciprocating the optical system. That is, the mirror 5 and the exposure rung 4 are supported by the first carriage 411, and the mirror 6.7 is supported by the second carriage 411, respectively.

41 is a guide rail 421.42. Guided by arrow a
It can be moved in parallel in any direction. 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 the first carriage 4, which supports the mirror 5, is fixed to a midway portion of the belt 45.

On the other hand, the rail 42. of the second carriage 41, which supports the mirror 6.7. The guide portion 46 of the rail 42. Two pulleys 47° 47 are rotatably provided apart from each other in the axial direction, and a wire 48 is connected between these pulleys 47 and 47.
is being handed over.

One end of this wire 48 is fixed to a fixing part 49, and the other end is fixed to the fixing part 49 via a coil ring 50, respectively. Further, one end of a first carriage 411 is fixed to a midway portion of the wire 48. Therefore, as the main motor 33 rotates, the belt 45 rotates and the first carriage 41. moves, and along with that, the second gear, Ji41. also move. At this time, pulley 4
7 and 47 serve as movable pulleys, the first carriage 4
11 to the second carriage 41. move in the same direction at the same speed.

In addition, 1. 2nd gear, 411, 41. The direction of movement of the motor 330 is controlled by switching the direction of rotation of the /4 pulse motor 330.

Further, on the document table 2, a copyable range corresponding to the specified paper is displayed. That is, the paper size specified by the paper selection key 304 is set as (PX e Py), and the magnification setting key 30. ．． If the copy magnification specified by 30 degrees is K, the copyable range (x-y) is x=Px/K y=Py/. Of this copyable mWi (X # y), the direction in the
The y-direction is indicated by
It is displayed by a scale 53 provided on the top surface of the screen.

The above-mentioned pointers 51 and 52 are connected to pulleys 54 and
55 via a spring 56. The pulley 55 is rotated by a motor 58.
are driven in accordance with the paper size and magnification, and 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
First, the carriage 41□ is moved to the second carriage 41. Then, run f4 is turned on and the second gear is moved to direction 41. is moved in the direction away from.

When scanning of the original is completed, rung 4 is turned off and the first
The carriage 4Z 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 21' includes an operation panel 30 and various switches and sensors, such as the cassette size detection switch 60. ．． 60. A high-voltage transformer 76 detects inputs from input devices 75 such as, and drives the various chargers, the static elimination run f28, the grade solenoid 27a of the cleaner 27, the heater 23 of the fixing roller pair 23, the exposure run 4, and It controls each of the motors 31 to 40, 58, etc. to perform the copying operation described above, and also controls the spot light source 131, the laser motor 135, the erase array 150, and the play drive section 160.
, memory 140, etc., to erase unnecessary portions of the document. Incidentally, a spot light source 131, a nogle motor 135, an erasing array 150, an array driving section 160
, memory 140 will be described later.

Among the above motors 31 to 40.58, motor 35.31
．． 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.
is controlled by the first sub-process group 22 via the pulse motor driver 79, and the motors 36, 39° 38.58
is controlled by the second sub-processor group 73 via the Nolles motor driver 80. Further, the exposure lamp 4 is controlled by the main output group 71 via the lamp regulator 81, and the heater 23a is controlled by the main output group 71 via the heater control section 82. Then, from the main processor group 71, the first. 2nd subprocessor f group 72
Drive and stop commands for each motor are sent to #73, and the
．． The second sub-processor group 72, 73 sends the status indicating the drive/stop state of each motor to the main processor group 71.In addition, the first sub-processor group 72 receives:
A position sensor 8 that detects each initial position of the motors 31 to 34
Location information from 3 has been input.

FIG. 10 shows an example of the configuration of the main processor group 71. In other words, 91 is a one-chip microcomputer (hereinafter simply referred to as microcomputer), which has input and output.
j! '-) The microcomputer 91 performs key human power detection and various display controls for an operation channel (not shown) via the microcomputer 92. The microcomputer 91 is expanded by input/output ports 93 to 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 respective inputs are connected to the input/output port 94. A copy condition setting switch and its individual inputs are connected to the turnout port 95. Note that the input/output port 96 is for external use.

FIG. 11 shows an example of the structure of the first subgroup 72. That is, 101 is a microcomputer, which is connected to the main processor group 71. 102 is l? This is a programmable interval timer for controlling the pulse motor phase switching interval time, and by setting the setting value from the microcomputer 101, the count value is set based on the setting value.
When the count is out, an end parable is output to the interrupt line of the i-icon 101. A reference clock signal 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.

And the above input/output yj? - The motor 10411c is connected to the motors 31 to 34 via the motor driver 79.
．． 135 is connected. In addition, the above input/output yf!
-) 1 o s Ha, 6 no! It is used, for example, when outputting a status signal of the motor to the main processor group 71.

FIG. 12 shows an example of the structure of the second FF crosser group 3. That is, 111 is a microcomputer, which is connected to the main processor group 11. Numeral 112 is a programmable interval timer for controlling the phase switching interval time of the Nockles motor, and when a set value is set by the microcomputer 111, it counts based on the setting value and outputs an end time when it counts out. This end pulse is applied to the latch circuit 113, and its output is supplied to the interrupt twin and input/output port input lines of the microcomputer 111.

Further, the microcomputer 111Vc is connected to an input/output port 114, and to this input/output port 114, the motors 3g, 3B, 39 .
58 are connected.

Fig. 13 shows the control circuit of the pulse motor. (D]'?hx motor driver 79.80) is connected to this Nockles motor driver 122, each winding A of the Nockles motor 123 (corresponding to the above-mentioned Millet motors 31 to 34, 36°38.39) ,
A, B, and B are connected.

Figure 14 shows the quick summer control method for a pulse motor.
The figure (a) shows the speed curve of the Luss motor, and the figure (b) 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 shows the slew-up and slew-down of the Noyals motor, which starts from the self-starting region, starts up, is used in the high-speed region, and then eventually falls. In addition, tl#t8...
-tx indicates the phase switching interval time.

Next, a function for specifying and erasing an erasing range of a document will be explained. 15 and 16, the first carriage 411 is provided with a guide shaft 130 along the rung 4 in a portion where the light of the lamp 4 is blocked.
A spot light source 13 is movably provided at 30 as a means for indicating the erasing range of the original. As shown in FIG. 16, this spot light source 131 consists of a light emitting element 132 such as a light emitting diode or a rung, and a lens 133, which are provided opposite to the document table 2.
The light generated by the lens 133 passes through the document table 2.
It is designed to be irradiated as a spot light having a diameter d. These light beams have a brightness that allows them to pass through the original G set on the original platen 2 and having a thickness of, for example, the thickness of a front page. Further, the spot light source 131 is connected to a timing belt (toothed belt) 134 disposed along the guide shaft 130.
is connected to. This timing belt 134 is passed between a pulley 136 and a driven pulley 137 provided on the rotating shaft of a noggle motor 135. therefore,
By rotating the pulse motor 135, the spot light source 131 is moved in a direction perpendicular to the scanning direction of the first carriage 411. Further, a position sensor 138 that detects the initial position of the spot light source 131 is provided on the first carriage 41□ located at the end of the guide shaft 130 on the side of the nozzle motor 135. When the 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, a method of specifying the erasing range of the document using the switch light source 131 will be described with reference to FIGS. 17 to 19. This spot light source 131 is moved by operating the aforementioned operation keys 30 & - 30 d. That is, when the operation keys sob and soa are pressed, the motor 33 is driven, and the first carriage 41□ and the spot light source 13 are driven.
1 is moved in the scanning direction (arrow y direction shown in FIG. 17). Also, an operation key 30a.

When 30c is pressed, the motor 135 is driven and the spot light source 131 is moved in a direction perpendicular to the scanning direction (direction of arrow X shown in FIG. 17).

The operator operates the operation keys 30a to 30d while visually observing the spot light transmitted through the document G, and presses the position designation key 30m while moving the spotlight to point S□ on the document G shown in FIGS. 1 and 8, for example. Press.

Then, the 'fi-coordinate position specified by this S□ is stored in the main processor group 2 shown in FIG.

Similarly, when the position specifying key 30e is pressed with the spotlight moved to point S8 on the document G, the position of point S8 is stored in the main processor group 71. The position of this spot light can be detected, for example, by counting the number of driving noises of the pulse motors 33, 135. After this,
When the erasure range designation key 301 is pressed, a rectangular area (indicated by diagonal lines) with the diagonal point <S, -8s as shown in FIG. 18(,) is designated as the erasure range. Also, as shown in Fig. 18), S of manuscript G.

When points 84 and 84 are specified and the erasure range designation key 30g is pressed, the area other than the square with the four diagonal points S, . . . S is designated as the erasure range. When the 1 erasure range specification keys 30f and 30g are pressed in this way, the main processor group 71 performs calculations based on the positions of the two designated points, and a high level signal "1" is stored in the memory 140 in the erasure range area. ,
A low level signal "'0" is stored in the other portions. That is, in this memory 140, for example, the capacity in each column direction is approximately equal to the movement distance in the X direction of the spot light source 131 divided by the position resolution in the X direction, and the capacity in each row direction is approximately equal to the movement distance in the X direction of the spot light source 131
18 (,
), as shown in Figure 19(a)K, and in the case of Figure 18(a), as shown in Figure 19(a), a high level signal, Low level signals are stored at other addresses.

Further, the operation panel 300 has a magnification setting key 306, a zoom key 30. If the copy magnification is set by , the set coordinate position is multiplied by the copy magnification to enlarge or reduce the coordinate position. Thereafter, based on this displaced coordinate position, a high level signal is stored in the erase range part and a low level signal is stored in the other part in the same manner as described above in the memory 140.

Note that when specifying the erasing range, the original G is set on the original table 2 with the copy side facing up, and when copying is to be performed, it is turned over along the fixed scale 21. Therefore, the positions of the signals actually stored in the memory 140 are reversed in the column direction.

On the other hand, as shown in FIG. 20, an erasing play 150 serving as erasing means is provided close to the photosensitive drum 10, for example, between the charger 11 and the exposure section Ph. As shown in FIG.
51 are arranged, and inside each of these cells 151, as shown in FIGS. 23(a) and 23(b), a light emitting element 152 consisting of, for example, a light emitting diode is provided. Furthermore, a lens 153 is provided in the opening of each cell 151 facing the photoreceptor drum 10 to focus the light from the light emitting element 152 onto the surface of the photoreceptor drum 10. This erase array 1
The number of light emitting elements arranged in the memory 14 is, for example,
It is matched with the column direction capacitance of 0. Here, if the distance between the light emitting elements 152 is P and the number is N, the total length of the erasing array 150 is Q=NXP.

The erase play 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 pits as the number of pits in the column direction of the memory 140, and a store register 16 in which the contents of this shift register 161 are held.
2. It is constituted by a switch circuit 164 consisting of a plurality of switch elements 163 that are controlled on and off by each output signal of the store register 162. The movable contacts 163a of these switch elements 163 are grounded, and the fixed contacts 163b are grounded. Each is connected to each cathode of a light emitting element (light emitting diode) 152 constituting the erase play 150. The anodes of each of these light emitting elements 152 are connected to the power supply vcc through current limiting resistors R, respectively.

As described above, when the erasing range of the original is specified and the original cover 11 is closed after death and the copy key 30□ is pressed, the first carriage 411 and the photosensitive drum 10 are operated, and the first data is stored in the memory 140. Data for one column is read out sequentially in the direction (shown in FIG. 19). This read data D1 is transferred to the shift register 161 of the array driving section 160 in response to the black signal CLK. After one column of data has been transferred to the shift register 161, when the charged portion of the photoreceptor drum 10 reaches the erase array 150, the main processor group 71 outputs a signal L.
TH is output, and in response to this signal, the shift register 16
The contents of 1 are provided to store register 162. That is,
Since the erasing array 150 is disposed between the charger 11 and the exposure section Ph, the 1 output from the mesori 140 is
For example, the data for the column is stored in the erase array 150 and the exposure section Ph.
Assuming that the angle of is θ□ and the photosensitive drum 10 is rotating at an angular velocity ω, the output timing of the chi signal LTH is set so that it is supplied to the store register 162 before θ, /ω. controlled.

Each switch element 163 of the switch circuit 164 is controlled by each output signal of this store register 162. 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. As a result, the light emitting elements 152 connected to each switch element 163 are turned on when the switch element 163 is on, and are turned off when the switch element 163 is off. Therefore, among the charged parts of the photoreceptor drum 10, the part where the light emitting element 152 is turned on is charge-free, and even if the charge-free part is exposed afterwards, no electrostatic latent image is formed, and the original image is not erased. I'm sorry for what happened. Thereafter, the data in the memory 140 is read out column by column in the same manner, and the image is erased.

Next, the main parts of this invention will be further explained. When specifying the erase range by operating the operation keys 30h to SOa, the spot light source 131 is set to the scale 53 and the pointer 51.5.
There is no point in moving to a position outside the copyable range represented by 2.

Therefore, the spot light source 131 is designed not to move beyond the limit of the copyable range, and when the switch light source 131 moves to the limit of the copyable range, the spot light source 131 blinks and You can now check it. Tsumashi, Figure 1 (,
) As shown in Figure 3, for example, when copying original A and G at the same size, the shaded area is the copyable area.
As shown in the figure, when copying an A4 original G to 141%, the area shown by diagonal lines becomes the copyable range, and the spot light source 131 is designed not to move beyond this range. When the spot light source 131 has moved to the limit of the range, the light emitting element 132 of the spot light source 131 blinks.

FIG. 2 explains the operation of the main processor group 71 in this case. That is, the main processor group 21 first determines whether any of the operation keys 30h to 30d has been operated on the Stella fS1, and if it has been operated, the light emitting element 1 of the spot light source 131 is activated in steps S and 2.
32 is supplied with a continuous lighting signal and is turned on. After this, press the operation keys 30h to 30 as described above in Step S.
In response to the operation in step d, the first carriage, the jig 41□, and the spot light source 13 are moved, and in step S4 and step S, the first
It is determined whether the carriages 4 to 8 and the spot light source 131 have moved to the limit of the copyable range Y or X, respectively. As a result, the 1st Kyaritsuzo 411, S? .

If any of the first light sources 131 has moved to the limit of the copyable range, in step S, the first light source 131 (first
The movement of the carriage 41,) is stopped, and at the same time
) An intermittent lighting signal is supplied to the light emitting element 132 of the light source 131 to blink the spot light source 131, and the control is transferred to step S. Moreover, the step S.

If it is determined in step S that neither the first carriage 411 nor the spot light source 131 has moved to the limit of the copyable range, press the position designation key 30 in step S.
・It is determined whether or not has been operated. As a result, if the position designation key 30e has not been operated, control is transferred to step S; if it has been operated, it is determined in step S whether or not the erase range designation key 301.30g has been operated. be done. As a result, the erase range specification keys sat, so
If none of H is operated, the control switches to the step
7's, and when any of these is operated, the light emitting element 1 of the spot light source 131 is switched to Stella fS.
32 is turned off. After this, as mentioned above, the memory 14
A process is performed in which a high level signal is stored in a portion corresponding to the erasing range of 0, and a low level signal is stored in the other portions.

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.

Furthermore, when specifying the erasing range, the spot light source 131 is prevented from moving beyond the limit of the copyable range, and when it moves to the limit, the spot light blinks to notify you of this. I have to. Therefore, it is possible to prevent erroneous operations such as specifying an area other than the copyable range.

Furthermore, since the spot light source 131 is provided in the first carriage 411, space can be used effectively and it is possible to prevent the apparatus from becoming a large building.

Note that this invention is not limited to the above embodiments.

For example, the arrangement position of the erasing array 150 is not limited to between the charger 11 and the exposure section Pha shown in FIG. It is also possible to configure the camera to erase the latent image as specified.

Further, the capacity of the mesh 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 specify and erase any part of the original image, and furthermore, it is possible to specify only within the image forming range of the original.
An image forming apparatus that can prevent erroneous operations can be provided.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the image forming apparatus according to the present invention, FIG. 1 is a plan view showing a copyable range, and FIG. 2 is a flowchart for explaining the operation. , FIG. 3 and FIG. 4 show the configuration of the image forming apparatus, FIG. 3 is a general perspective view, FIG. 4 is a side sectional view, and FIG. 5 is a plan view showing the configuration of the operation panel. FIG. 6 is a perspective view showing the structure of the drive unit, FIG. 7 is a perspective view schematically showing the drive mechanism of the optical system, FIG. 8 is a perspective view schematically showing the drive mechanism of the pointer, and FIG. 9 is a perspective view schematically showing the drive mechanism of the optical system. Block diagram showing the overall control circuit, No. 10
The figure shows the configuration of the main processor group.
FIG. 12 is a configuration diagram of the second processor group, FIG. 13 is a schematic configuration diagram showing the control circuit of the Noyals motor, and FIG. 14 is a diagram for explaining the speed control method of the 14S 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. 20 is a side sectional view of the main parts showing the arrangement of the erasing array, and FIGS. 21 and 22 are diagrams showing the relationship between the erasing array and the photosensitive drum, respectively. Fig. 21 is a perspective view showing only the main parts, Fig. 22 is a front view showing only the main parts, and Fig. 22 is a front view showing only the main parts.
Figure 3 shows the configuration of the erase array.
24 is a side sectional view, FIG.
The figure is a side sectional view of the main parts showing another example of the arrangement of the erase play. 1...Main body, 2...Original table, P...Paper, 10-
・・Photosensitive drum, 30h~30rl"-operation key, 3
0e...position specification key, sot, sog...erasure range specification key, 33...scanning motor, 411...
1st carrier, 71...main processor group, 13
1... Spot light source, 132... Light emitting element, 135
...Pulse motor, 15o...Erasing array, 152
...Light emitting element, 16o...Array drive unit, 4θ・
・・Memory, Ph"・Exposure section. Applicant's agent Patent attorney Takehiko Suzue 1st prisoner (a) Figure 1 (b) 3 (JC$Jb j inside blade Figure 10 Figure 12 Figure 15 Fig. 16 Fig. 17 Fig. 18 (a) 30C301) 309 J (J Fig. 18 Fig. 19 (a) (b) Fig. 20 Fig. 25 Fig. 22 Fig. 23 Fig. 24

Claims (2)

[Claims] (1) 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 this charge pattern is developed. In an image forming apparatus that forms an image by transferring and fixing it to a material to be transferred, an indicating means provided in the scanning means and irradiating a spot light to indicate a predetermined range of a document when specifying a range;
The apparatus is equipped with an erasing means for erasing the electric charge of a portion corresponding to the designated range during image formation, and a control means for controlling the spot light from the indicating means when specifying the range so that it does not exceed the limit of the image forming possible range. An image forming apparatus characterized by: (2) The image forming apparatus according to claim 1, wherein when the spotlight from the instruction means moves to the limit of the image forming possible range, the spotlight is blinked.