JPS61166577A - Image forming device - Google Patents

Abstract

PURPOSE:To improve the operability by moving a transmitted light to designate an erase range and irradiating the rays of light to a photosensitive drum in accordance with this designated erase range and displaying, especially, the designated erase range with the transmitted light. CONSTITUTION:A spot light 131 is moved while lighting a light emitting element 132 by the operations of operation keys 30a-30d. When an operator operates operations keys 30a-30d while targetting a spot light transmitted through an original G and depresses a position designating key 30e when the spot light is moved to a point S1 on the original G, the coordinate position (x1, y1) designated by this point S1 is stored in a main processor group 71. Similarly, the coordinate position (x2, y2) of a point S2 is stored. When an erase range designating key 30f is depressed thereafter, a rectangular area with points S1 and S2 as diagonal points is designated as the erase range.

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 onto a sheet of paper, and enlarging or reducing the original image for copying.

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

Furthermore, it would be convenient in practice if it were possible to specify the erasing range of the original image and to confirm the designated erasing range.

[Purpose of the invention]

This invention was made based on the above circumstances,
The purpose of this invention is to provide an image forming apparatus that is capable of specifying and erasing any part of a document image and also of confirming the specified erasing range. ] This invention, for example, irradiates an original image with a spotlight, moves this spot light to designate an erasing range, and irradiates a photoreceptor drum with light corresponding to the designated erasing range to perform a still image. An image is formed by erasing an electrostatic latent image or charge, and in particular, a specified erasing range can be displayed using spot light.

[Embodiments of the invention]

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

FIGS. 13 and 14 schematically show an image forming apparatus, such as a copying machine, according to the present invention. That is, I is a main body of a copying machine, and a document table (transparent plus) 2 is fixed to the upper surface of the main body 1 for supporting a document. This manuscript table 2
A fixed scale 21 is provided as a reference for setting a document, and a document cover 1g that can be opened and closed and a work table 12 are further provided near the document table 2.

The original set on the document table 2 is processed by an optical system consisting of an exposure land 4 and mirrors 5, 6, and 7 reciprocating along the lower surface of the document table 2 in the direction of the arrow.
Exposure scanning is performed during the reciprocation. In this case, the mirrors 6 and 7 move at the speed A of the mirror 5 to keep the optical path length constant. Light reflected from the original by the scanning of the optical system, that is, the original by the light irradiation of the exposure run f4. The reflected light is reflected by the mirrors 5, 6.7, passes through the variable magnification lens group 8, is further reflected by the mirror 9, and is guided to the photoreceptor drum 10, so that the image of the document is transferred to the photoreceptor drum. The image is formed on the surface of 10.

The photosensitive drum 10 rotates in the direction of arrow C, and the surface is first charged by the charging device 111/C, and then the image of the original is exposed to light so that it becomes static! A latent image is formed, and this electrostatic latent image becomes visible when toner is applied by the developer 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 feed roller I5 or 16, passes through the paper guide path 11 or 18, and then passes through the reso roller pair. z9, and is sent to the transfer section by this pair of rollers 19. Here, each of the paper feed cassettes 13.
I4 is detachably provided at the lower right end of the main body 2, and is designed so that either one can be selected in the operation/control described later. In addition, each of the above paper feed cassettes 1
3.14 are seven cassette size detection switches 601
,60. The cassette size is detected by This detection switch 601.601 is composed of a plurality of microswitches that are turned on and off according to the insertion of cassettes of different sizes.

On the other hand, the paper P sent to the transfer section is charged by the transfer charger 200.
By coming into close contact with the surface of the photoreceptor drum 100,
The toner particles on the photosensitive drum 10 are transferred by the action of the charger 20. The transferred paper P is peeled off from the photoreceptor drum ro by the action of the peeling charger 210 and conveyed on the conveyor belt 22, and sent to a pair of fixing rollers 23 as a fixing device thrown at the terminal end of the conveyor belt 22. By passing through this, the υ transfer portion is fixed. Then, the paper P after fixing is
The paper is discharged onto a tray 25 outside the main body 1 by a pair of paper discharge rollers 24. In addition, after the photosensitive drum 10 after the transfer is neutralized by the neutralizing charger 26T/C,
The residual toner on the surface is removed by the cleaner 27, and the residual image is erased by the static elimination rung 28, so that the initial state is restored. Note that 29 is a cooling fan for preventing the temperature inside the main body 1 from rising.

FIG. 15 shows the operation panel 30 provided on the main body. 301 is a copy key for commanding the start of copying; 30
! 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., 3Q
4 is a cassette selection key for selecting the upper and lower paper feed cassettes 13 and 14, 30i is a cassette display section for displaying the selected cassette, and 30- is a magnification setting key for setting the copy enlargement and reduction magnification in a predetermined relationship. , 307 is a zoom key for steplessly setting the enlargement/reduction magnification, 30@ is a display section for displaying the set magnification, 30g is a density setting section for setting copy density, and 30h, 30b, 30e, and 30d will be described later, respectively. Spot indicating the erase position of the original.

30 is the operation key for moving the spot light source, and 30 is the coordinate position indicated by the spot light source (ilit - manual position specification -? -130
f and 30g are erase range designation keys for specifying the erase range at the designated position itK, and 30h are check and mark keys for confirming the erase designated range.

FIG. 16 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 10 and the lens 8 for changing the magnification. Reference numeral 32 denotes a mirror motor for changing the distance (optical path length) t- between the rounded mirror 5 and mirror 6°7 for varying magnification.

A scanning motor 33 is a motor for moving the exposure rung 4, the mirror 5, and the mirror 6.7 for scanning the original. 34 is a shutter motor, and the charging width of the photoreceptor drum 10 by the charger 11 during zooming is set to v4.
7. (not shown) t-Motor for moving. Reference numeral 35 denotes a developing motor, which is a motor for driving the developing cooler of the developing device I2.

A drum motor 36 is a motor for driving the photosensitive drum 10. A fixing motor 37 is a motor for driving the paper transport path 22, the pair of fixing rollers 23, and the pair of paper discharge 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 19t. A fan motor 40 is a motor for driving the cooling fan 29.

FIG. 17 shows a round drive mechanism for reciprocating the optical system. That is, the mirror 5 and the exposure land 4 are supported by the first carrier, the mirror 6.2, and the mirror 6.2 is supported by the second carrier, the mirror 6.2, respectively. 41. are guide rails 421, 42. In other words, the four-phase pulse motor 33 drives the pulley 43 so that it can freely move in parallel in the direction of the arrow a. An endless belt 45 is stretched between the pulley 43 and the idle pulley 44, and one end of a first gear 411 that supports the mirror 5 is fixed to a midway portion of the belt 45. On the other hand, a second gear supporting mirror 6.7,
No41! Rail 42! The guide part 46 has a rail 42
Two pulleys 47, 47 are rotatably provided apart from each other in the axial direction of the goose, and a wire 48 is stretched between these pulleys 747, 47. 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 5o. Further, a first carrier is provided in the middle of the wire 48.

One end of 411 is fixed. Therefore, as the pulse motor 33 rotates, the belt 45 rotates and the first gear 41K moves, and accordingly, the second gear 41K moves.
Kyari, Ji 418 also moves. At this time, pulley 47.
Since 47 acts as a movable pulley, the first gear, No. 411
In contrast, the second cartridge 411 moves in the same direction at a speed of A. In addition, 1. To the second carriage *412
The moving direction of the pulse motor 330 is controlled by switching the rotation direction of the pulse motor 330.

Further, on the document table 2, a copyable range corresponding to the specified paper is displayed. That is, the paper size f (Px, Py) specified by the paper selection key 304 is set, and the magnification setting key 306 is pressed.

If the copy magnification designated by 307 is K, the copyable range (x, y) is x=Px/K y = Py/K. Of this copyable range (x, y), the X direction is indicated by the pointers 51° 52 provided on the back surface of the document table 2, and the X direction is indicated by the first cylinder, 41. It is displayed by a scale 53 provided on the top surface of the screen.

The above guidelines 51 and 52 are as shown in FIG.
54 and 55 via a wire ring 56.

The googly 55 is rotated by a motor 58, and by driving this motor 58 according to the paper size and magnification, the distance between the pointers 51 and 52 can be changed.

Further, the first carriage 411 is moved to a predetermined position (home or non-scan depending on the magnification) by driving the motor 33 according to the paper size and magnification. Then, when the copy key 30 is pressed, the first
First of all, the second carriage 41! Then, the lamp a4 is turned on and the second gear is moved away from the shaft 11.

When scanning of the document is completed, lamp #4 is turned off and the first medium, Xl, is returned to the home position.

FIG. 19 shows the overall control circuit, showing the main group 7, the group 21, and the first group 21. 2nd Saggrosetsa group 72.73
It is mainly composed of. The above-mentioned main group 71 includes an operation panel 30 and various switches and sensors such as the skein and size detection switch.
A high-voltage transformer 76 that detects input from an input device 75 such as 2 and drives the various chargers, and the static elimination lamp 28.
, the platen lens 27 of the cleaner 27, the heater 23a of the fixing roller pair 23, the exposure lamp 4,
and controlling each of the motors 31 to 40.58, etc.,
While carrying out the above-mentioned copying operation, the 1st and 1st light sources 131
, Noculus motor 135, erasing array 150, 7-ray drive unit 1601, memo IJ 140, etc. to erase unnecessary portions of the document. In addition, Shuato Hikari#,
r s r, Norse motor 135, erasure array 150
, array drive section 160. Memory 140 will be described later.

Among the above motors 31 to 40.58, motor 35.37
．． A toner motor 72 that supplies toner to the developer 40 and the developing device 12 is controlled by the main processor group 71 via a motor driver 78.
is the first sub fa via the Noculus motor driver 79.
The motors 36 and 39 are controlled by a group 72.

38.511 is controlled by the second output group 73 via the /4 pulse motor driver 80.

Further, the exposure lamp 4 is controlled by the main group 71 via the Lambray generator 81, and the heater 23 & is controlled by the main group 71 via the heater control section 82. Then, from the main processor group 71, @1. Commands to drive and stop each motor are sent to the second sub-process group 72, 73, and the first sub-process. 2nd Saguro Nanatsusa Group 72.7
3 to the main processor group 71, a status indicating the drive/stop state of each motor is sent. In addition, position information from a position sensor 83 that detects the initial position of each of the motors 31 to 34 is inputted to the first stage group 22.

FIG. 20 shows an example of the configuration of the main processor group 71. In other words, 91 is Wanchi.

A microcomputer (hereinafter simply referred to as microcomputer) performs key force detection on an operation panel (not shown) and various display controls via an input/output board 92. Additionally, the MyPun 91 is expanded with input/output ports 93-96. The input/output J-to 93 includes a high voltage transformer 76, a motor driver 78, and a Lambray generator 8.
1 and other outputs are connected, input/output capo) 94
A size switch for detecting the paper size and its individual inputs are connected to the input/output, f? -) 95 is connected to a copying condition setting switch and its respective inputs. In addition,
The input/output port 96 is for the optic beak.

FIG. 21 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; when a set value is set from the microcomputer 101, it starts counting based on the set value, and when the microcomputer 101 counts out, the end time is set. output to the interrupt line. A reference clock pulse is input to the timer 102. Further, the microcomputer 101 receives position information from the position sensor 83 and is connected to input/output ports 103 and 104.

The motors 31 to 34.135 are connected to the input/output port IO4 via the pulse motor driver 79. In addition, the above input/output j) f −) 7 o
3 is used when outputting the status f-tas signal of each pulse motor to the main processor group 7I.

FIG. 22 shows an example of the configuration of the second sub-processor group 73. That is, 111 is a microcomputer connected to the main processor group 7I. IZ2 is no! This is a programmable interval timer for controlling the phase switching interval time of the motor.
When the count is out, an end parable is output. This termination signal is latched by the latch circuit 113, and its output is supplied to the interrupt line and input/output line of the microphone 111.

Also, is the microcomputer IIIVC input/output d? - tx4 is connected to this input/output port II4, and the motors 36, 3B,
39,511 are connected.

Fig. 23 shows the control circuit of the 4 Luss motor.
122 (Fig. 21 O) 4 lume motor driver 75
1. JOK equivalent) is connected to this metallurgy motor driver 122, and each 11 g of the Norirusu motor 123 (equivalent to the above I-system motor 31 to 34°sg, sg, 5yVc) is connected.
1lAk,X,B.

Hundreds are connected.

Fig. 24 shows the speed control method of the /morus motor, (&) is the speed curve of the /morus motor, and (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. In other words, this is...! This figure shows the through-down and through-down of a low-speed motor, starting from the self-starting region, starting in the startup region, using it in the high-speed region, and then finally falling and dying. In addition, t1+t2・
...tx indicates the time of the phase switching interval.

Next, the main parts of this invention will be explained. Figures 2 and 3
In the figure, a guide shaft 130 is provided along the land 4 in a portion where the light of the land 4 is blocked in the first carriage 411, and this guide shaft 130Vc is a means for indicating the erasing range of the original. A light source 131 is movably provided. As shown in FIG. 3, this spot light source 131 includes a light emitting element 132, such as a light emitting diode or a rung, and a lens 1 provided opposite to the document table 2.
33, and the light generated by the light emitting element 132 is irradiated onto the document table 2 as a spot light having a diameter d by the lens 133. This spot light has a brightness that allows it to pass through the original G set on the original platen 2, for example, as thick as a postcard.

Further, the spot light source 131 is connected to a timing belt (toothed belt) 134 disposed along the side shaft 130VC. This timing belt 134 is passed between a pulley 136 provided on the rotating shaft of the /4 Luss motor 1350 and the driven data IJ l j 7. Therefore, by rotating the pulse generator 135, the pulse generator 135 is rotated.
,) Hikari@131 is the 1st Kyary, No.41. is moved in a direction perpendicular to the scanning direction. In addition, the guide shaft 130 -
The first gear located at the end of the system motor 135, No. 41
1 is provided with a position sensor 138 consisting of a microswitch that detects the initial position lit 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 1311 and the initial position is set. The location is now detected.

Next, using FIGS. 4 to 6, the spot light source 13
1 will be used to specify the erase range of the original.This spot light source 131 is
0&~30d1fr: By operating, light emitting element 1
It is moved with 32 lit. That is, operation -? -3
0b.

When 30d is pressed, the controller 33 is driven, and the first carriage 411 and spot light source 131 are moved in the scanning direction (direction of arrow X shown in FIG. 4). Also, operation?
When 30h and 30rHH are pressed, the motor 135 is driven and the spot light source 131 is moved in the direction perpendicular to the scanning direction (fourth direction).
(direction of arrow X shown in the figure). The operator presses the operation keys 30 to 3 while visually observing the spot light transmitted through the document G.
0d to move the spotlight to a point Si on the document G shown in FIG. 5, for example, and then press the position designation key 30. Then, the coordinate position (xl ey
s) is shown in Figure 19. Main gloss length details 7ZIC
be remembered. Similarly, when position specification key 3Q is pressed with the spotlight moved to point S1 on document G, the coordinate position (X! +71) of point S2 is the main gloss.

The data is stored in the group 71. The position of this light can be detected by counting the number of JEK motion pulses of the /4 pulse motors J J , I J , 5, for example. After this, specify the erase range =? - When you press 301,
), a rectangular area (indicated by diagonal lines) having the point <S+eSB as the diagonal point is designated as the erasing range. Also, as shown in Fig. 5(b), if you specify 83% 84 points of original G and press -30g while specifying the erase range, 8$ + S
The area other than the square with four diagonal points is designated as the erasing range. On top of this, erase range specification #-301゜3
01rf: When pressed, the main processor group 71 performs calculations based on the positions of the two specified points, and the memo +7
In 140, a high level signal "1" is stored in the erase range portion, and a low level signal "0#" is stored in the other portions. That is, in this memo +7140, for example, the capacitance in each column direction is approximately equal to the movement distance in the X direction of the spot light source 131 ÷ the position resolution in the X direction, and the capacitance in each row direction is set as follows:
In the case of FIG. 5(a), according to the data supplied from the main processor group 21, the data as shown in FIG. As shown in (a), also in Fig. 5 (
In case b), as shown in FIG. 6(b), a high level signal is stored at the address corresponding to the shaded area, and a low level signal is stored at the other addresses.

On the other hand, as shown in FIG. 7, 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. This erase array 1
50 is a photosensitive drum 100 as shown in FIGS. 8 and 9.
A plurality of light-shielding cells 151 are arranged in a direction perpendicular to the rotation direction, and a light-emitting element 152 made of, for example, a light-emitting diode is provided inside each of these cells 151, as shown in FIGS. ing.

Furthermore, a lens 153 is provided in the opening of each cell 151 facing the photoreceptor drum 10 to focus the light from the light emitting element 152 onto the surface of the photoreceptor drum 10 . The number of light emitting elements arranged in this erasing array 150 matches, for example, the capacity of the memory 1400 in the column direction. Here, if the distance between the light emitting elements 152 is P and the number is N, the total length of the erasing array 150 is Q=NXP.

The erase array 150 is driven by the array driver 160 described above. As shown in FIG. 11, this array driving section 160 has a memory nozzle 161 having the same number of bits as the number of bits in the column direction of the memory 1400. Store register I6 that holds the contents of this empty storage register 161
2. It is constituted by a switch circuit 164 including a plurality of switch elements 163 which are controlled on and off by each output signal of the store register 162, and the movable contacts 163& 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 erasing array 150. The anode of each of these light emitting elements 152 is 11t.
They are connected to the power supply vec through respective flow-limiting resistors R.

After specifying the erase range of the original as described above, close the original cover 11 and press the copy key 30rt-.
As the first carry, J41%, and photosensitive drum IO are operated, data for one column is sequentially read from the memory 140 in the row direction (shown in FIG. 5). This read data D1 is transferred to the offset register 161 of the array drive section 160 by the clock signal CLK. /After one column of data has been transferred to the FUTRENOSTAR 161, when the charged portion of the photoreceptor drum 10 reaches the erase array 150, the main processor group 71 outputs a latch signal L.
TH is output, and in response to this signal, the shift reno star 16
1 contents of 2!1″--supplied to store register 162.

That is, since the erasing array rso is arranged between the charger 11 and the exposure section ph, the data for one column output from the memory 140 is, for example, when the angle between the erasing array 150 and the exposure section ph is 01. Assuming that the photosensitive drum 10 is rotating at an angular velocity ω, the output timing of the latch signal LTH is controlled so that it is supplied to the store register 162 before θ1/ω.

Each switch element 163 of the switch circuit 164 is controlled by each output signal of this store register 162. That is, 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 IQ, 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. Become a benevolent person. Thereafter, data in the memo IJ 140 is read out one column at a time in the same manner, and images are erased.

Next, the operation when the check key 30h is operated will be explained.

Operation keys 30, -. 70d, after operating the position designation key 30e, when the check key 3Qh is operated, the designated erasure range is displayed. That is, when the key 30h is operated, the main processor group 7I drives the first light source 131 according to the stored coordinate position of the spot light.

For example, the specified erasing range is as shown in Figure 1.
1 (Xl 171 )*Sz (XI a
ys ), the spot light source 131 is first moved at the stored coordinate position S1 (Xl e71 )t, and in the state in which the spot light source 131 is moved to this coordinate position S1, the light emitting element 132 is A lighting signal is supplied from 11, and this is turned on. In this state, the first cylinder 41K, the spot light source 13
1 is driven, and the light beam I2 is moved in accordance with the arrow shown in FIG. That is, first, only the spot light source 131 is driven to emit light at the coordinate position Ss (xt eyx).
It is moved from (xzyyt), and after this the first cylinder,
Only the 411 is driven and the suit light moves to the coordinate position (Xl
p) 'l) to coordinate position S! (Xl vYM)
will be moved up to Furthermore, only the spot light source 1.11 is driven again, and the spot light source 1.11 is moved to the coordinate position (x, ays).
Finally, only the first carriage 411 is driven to move the spot light from the coordinate position (xl e7) to the coordinate position 1ist (xt p71).

In this way, the erasing range is displayed, and the spot light source 13
2 reaches the coordinate position 'el S r, the light emitting element 13
2 is turned off.

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

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.

In addition, the specified erasure range is displayed using the spot light source 131 by operating the check key 30b, so it can be easily confirmed.

Furthermore, since the spot light source 131 is provided in the first barrel 411, the sweep can be used effectively and it is possible to suppress the increase in size of the device.

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

For example, the arrangement position of the erasing array 150 is not limited to between the charger 11 and the exposure section ph shown in FIG. 7, but also between the exposure section ph and the developing device 120 as shown in FIG. It is also an OT function to be configured to erase the electrostatic latent image according to a specification.

In addition, the content Ji of the memo IJ 140 [can be changed as required.

It goes without saying that 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 specify and erase any part of a document image, and can also confirm the specified erasure range.

[Brief explanation of the drawing]

1 to 11 show an embodiment of the main parts of an image forming apparatus according to the present invention, FIG. 1 is a plan view for explaining the display operation of the erasing range, and FIG. Syt
? y) A perspective view of the main parts showing the light source, Figure 3 shows the spot light f
FIGS. 4 and 5 are plan views for explaining the operation of specifying the erasing range of the original using a spot light source, and FIG. FIG. 7 is a side sectional view of the main parts showing the arrangement of the erasing array, and FIGS. 8 and 9 respectively show the relationship between the erasing array and the photosensitive drum. Figure 9 is a perspective view showing only the main parts, Figure 9 is a front view showing only the main parts, Figure 10 is a front view showing only the main parts.
The figure shows the configuration of the erase array.
is a side sectional view, and (b) is a partially cutaway front view.
FIG. 11 is a circuit configuration diagram showing the configuration of the array drive section.
Figure 2 is a side sectional view of the main parts showing another example of the arrangement of the erase array;
13 and 14 show the configuration of the image forming apparatus, FIG. 13 is a general perspective view, FIG. 14 is a side sectional view, FIG. 15 is a plan view showing the configuration of the operation panel, and FIG. The figure is a perspective view showing the configuration of the drive section, FIG. 17 is a perspective view schematically showing the drive mechanism of the optical system, FIG. 18 is a perspective view schematically showing the drive mechanism of the pointer, and FIG. 19 is the overall view. Fig. 20 is a block diagram showing the main control circuit.
Figure 1 shows the configuration of the first sub-derose group, and Figure 22 shows the second sub-group.
FIG. 23 is a schematic diagram showing the control circuit of the pulse motor, and FIG. 24 is a diagram for explaining the speed control method of the pulse motor. DESCRIPTION OF SYMBOLS 1...Copying machine main body, 2...Document stand, 10...Photosensitive drum, 30-30d...Operation key, 30c...
・Position designation key, 30f, 30g...Erase range designation key, 30h...Check, key-141K...First carriage, 71...Main processor group, 131...
・Spot light source, 132... Light emitting element, I33...
7. e, 135.../-Russ motor, 150...
Erasing array, 152... Light emitting element, 153... Lens, 160... Array drive unit, 140... Memory,
P...Paper, ph...Exposure section. Applicant's representative Patent attorney Takehiko Suzue Figure 2 Figure 3 Figure 4 Figure 5 (a) JUCJ (Jl) JQ9 JtJn jQ Figure 5 Figure 6 (a) (b) Figure 7 Figure 12 Figure 8 Figure 9 (a) (b) 411 Figure 1 O Figure 16 Figure 18 Figure 21 Figure 22 Figure 23 Figure 24

Claims (3)

[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 transfer material, an indicating means is provided in the scanning means and indicates a predetermined range of a document by transmitted light when specifying a range, and a portion corresponding to the specified range. An image forming apparatus comprising: erasing means for erasing charges during image formation; and control means for operating the instruction means to display the indicated range. (2) The image according to claim 1, wherein the indicating means is movable in a direction perpendicular to the moving direction of the scanning means and comprises a light emitting element and a lens that irradiates a spot light onto the document surface. Forming device. (3) The image forming apparatus according to claim 1, wherein the erasing means comprises a plurality of light emitting elements arranged near the image carrier along the longitudinal direction of the image carrier. .