JPS6240478A - Picture forming device - Google Patents

Abstract

PURPOSE:To form an underline without overlapping an original picture by detecting movement of spot light, detecting an error between the position of movement and arrangement pitch of light emission elements constituting an erasing array, and shifting the position of light emission of the light emission elements according to the error. CONSTITUTION:Arrangement pitch P of light emission elements 152 constituting an erasing array 150 is, for instance 2mm. On the other hand a spot light source 131 is moved at a pitch of, for instance, about 0.2mm by one pulse signal supplied by a pulse motor 135 that drives the light source. Consequently, when the light emission element 152a of the erasing array 150 is put out for the position of forming of an underline designated by the spot light Se, Sf, the formed underline L sometimes overlaps the original picture. Accordingly, the position of movement of the spot light source 131 is detected in a main processor group 71, and the positional relation between the detected position of movement and the light emission element 152 of the erasing array 150 is compared, and the position of forming of the underline is controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to an image forming apparatus applied to, for example, an electronic copying machine.

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

Incidentally, recently, a copy 1 (Japanese Patent Application No. 56533/1982) has been developed which is capable of specifying and erasing a predetermined range of a document or forming an underline in a predetermined portion of the document. This copying machine specifies the erasing range and underline formation position for the original set on the document table using a spot light irradiated from the back side of the document table. When erasing an image, the erasing array consisting of a plurality of light emitting elements is controlled, and when erasing an image, it erases the electrostatic latent image formed on the photoreceptor drum corresponding to a specified part of the original image, and forms an underline. In this case, the electrostatic latent image other than the underline forming position is erased.

However, the movement pitch of the spot light is significantly smaller than the arrangement pitch of the light emitting elements constituting the erasing array. Therefore, for example, when an underline is specified, the underline is not necessarily formed at the specified position, and in the worst case, the underline may overlap the original image.

[Object of the invention] This invention was made based on the above circumstances,
The purpose is to provide an image forming apparatus capable of forming an underline without overlapping the original image.

[Summary of the invention]

For example, the present invention detects the movement of a spot light, detects an error between the movement position and the arrangement pitch of the light emitting elements constituting the erasing array, and shifts the light emitting position of the light emitting elements in accordance with this error. It is something.

[Embodiments of the invention]

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

FIGS. 3 and 4 schematically show an image forming apparatus of the present invention, such as a copying machine. A document table (transparent glass) 2 for supporting a document is fixed to the top surface of the copying machine main body 1. The document table 2 is provided with a fixed scale 21 that serves as a reference for setting the document, and furthermore, a document cover 11 and a work table 12, which can be opened and closed, are provided near the document table 2. The original placed on the original platen 2 is processed by an optical system consisting of an exposure lamp 4 and mirrors 5, 6, and 7.
Exposure scanning is performed by reciprocating in the direction of arrow a along the lower surface of document table 2. in this case,
Mirror 6.7 is 1/1/2 of mirror 5 to maintain the light exposure length.
It is moved at a speed of 2.

The light reflected from the original by the scanning of the optical system, that is, the light reflected from the original by the light irradiation of the exposure lamp 4, is reflected by the mirror 5, 6, 7, passes through the variable magnification lens block 8, and is further reflected by the mirror. 9 and guided to the photoreceptor drum 10, so that the image of the document is formed on the surface of the photoreceptor drum 10.

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

On the other hand, the paper (transfer material) P is taken out one by one from the selected upper paper feed cassette 13 or lower paper feed cassette 14 by the delivery roller 15 or 16, and the taken out paper is taken out from the paper guide path 17 or 18 and is guided to a pair of registration rollers 19, and guided to a transfer section by this pair of registration rollers 19. Here, the paper feed cassettes 13 and 14 are removably provided at the lower right end of the main body 1, and one of them can be selected from an operation panel to be described later.

The cassette size of each of the paper feed cassettes 13 and 14 is detected by a cassette size detection switch 601 and 602, respectively. The cassette size detection switches 601 and 602 are composed of a plurality of microswitches that are turned on and off according to the insertion of cassettes of different sizes.

The paper P sent to the transfer section is brought into close contact with the surface of the photoreceptor drum 10 at the transfer charger 20, and
The toner image on the photoreceptor drum 10 is transferred by the action of 0. The transferred MP is electrostatically peeled off from the photoreceptor drum 10 by the action of a peeling charger 21, and is sent by a conveyor belt 22 to a fixing roller 23 as a fixing device provided at the end thereof. The transferred image is fixed by passing through this, and the fixed paper P is discharged to a tray 25 outside the main body 1 by a pair of ejecting rollers 24. Further, the photoreceptor drum 10 after the transfer is transferred to a charger 2 for removing static electricity.
6, residual toner on the surface is removed by a cleaner 27, and afterimages are roughly erased by a static elimination lamp 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.

Further, a multiple copying unit 603 is provided at the bottom of the main body 1 and is used for, for example, an underline forming operation, which will be described later. This multiple copy unit 60g returns the paper sent out by the pair of paper discharge rollers 24 to the pair of registration rollers 19 in order to make further copies on the same side of the paper that has already been copied. That is, inside this multiple copying unit 603, there are a pair of paper ejection rollers 24 and 604.
A gate 605 is provided between them for distribution.

For this distribution, the gate 60s is in the state shown by the solid line during normal copying, and is operated as shown by the dotted line when under run is formed, and the paper sent out by the paper ejection roller pair 24 is transferred to the conveyor belt 606, 607. It is designed to guide you between the two. These conveyor belts 60s, 60
Reference numeral 7 is for holding and conveying the paper and guiding it into the guide path 60a, and the paper introduced into this guide path 608 is sent to the photosensitive drum 10 again in synchronization with the optical system. .

FIG. 5 shows an operation panel 30 provided on the main body 1. 301 is a copy key for instructing the start of copying; 302
is a numeric keypad for setting the number of copies, etc.; 303 is a display unit that displays the operating status of each section and paper jams; 304 is a cassette selection key for selecting the upper and lower paper feed cassettes 13 and 14; 305 is a selected key. A cassette display section for displaying the cassette, 306 a magnification setting key for setting the copy enlargement/reduction magnification in a predetermined relationship, 307 a zoom key for steplessly setting the enlargement/reduction magnification, and 30e for displaying the set magnification. A display section, 30g is a density setting section for setting the copy density, 30a, 30b, 30c, and 30d are operation keys for moving a spot light source that indicates the erase position of the original, which will be described later, and 30e is for inputting the coordinate position indicated by the spot light source. Position designation keys 30f and 30c+ are erasure range designation keys that designate the erasure range at designated positions, respectively;
30h is an underline designation key for designating the formation of an underline on a sheet of paper on which an image has been formed.

FIG. 6 shows an example of the drive source configuration of each drive section of the copying machine configured as described above, and is composed of the following motors. That is, 31 is a lens motor, which is a motor for moving the position of the lens block 8 for performing magnification change. 32 is a mirror motor;
This is a motor for changing the distance (optical path length) between the mirror 5 and the mirror 6.7 for changing the magnification.

A scanning motor 33 is a motor for moving the exposure lamp 4, the mirror 5, and the mirror 6.7 for scanning the original. 34 is Sha.

This motor is a motor for moving a shutter (not shown) for adjusting the charging width of the photoreceptor 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. 36 is a drum motor, which is a motor for driving the photosensitive drum 10. 37 is a fixing motor, which connects the paper conveyance path 22,
This is a motor for driving the fixing roller pair 23 and the paper ejection roller pair 24. 38 is a paper feeding motor, which is a motor for driving the delivery rollers 15 and 16. 3
Reference numeral 9 denotes a paper feed motor, and the registration roller pair 19
This is a motor for driving. 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 lamp 4 are supported by a first carriage 411, and the mirror 6.7 is supported by a second carriage 422, and these carriages 411 and 412 are guided by guide rails 421 and 422 in the direction of arrow a. It is said to be able to move in parallel. Further, the four-phase pulse -E-433 is adapted to drive the pulley 43. An endless belt 45 is passed between this pulley 43 and the idle pulley 44, and this belt 45
The first carriage 41 supports the mirror 5 in the middle of the ! One end is fixed. On the other hand, a rail 422 is attached to the guide portion 46 of the second carriage 422 that supports the mirror 6.7.
Two pulleys 47.47 are rotatably provided apart from each other in the axial direction, and a wire 48 is stretched between these pulleys 47.47. 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 50. In addition, the wire 4
One end of a first carriage 411 is fixed to the middle part of 8. Therefore, by rotating the pulse motor 33, the belt 45 rotates and the first carriage 411
is moved, and the second carriage 422 is also moved accordingly. At this time, since the pulleys 47 and 47 act as llll pulleys, the second
Carriage 422 is moved in the same direction at 1/2 speed. Note that the moving directions of the first and second carriages 411 and 412 are controlled by switching the rotation direction of the pulse motor 33.

The paper size specified by the key 304 (Px, P
y) and the copy magnification specified by the magnification setting keys 30s and 307 is K, then the copyable range (X, y)
is rx-px/KJ.

ry=Py/KJ. This copyable range (x, y)
In the X direction, a pointer 51 provided on the back side of the document table 2
．． 52, and the y direction is indicated by a scale 53 provided on the upper surface of the first carriage 411.
and the distance between the fixed scales 21.

As shown in FIG. 8, the pointer 5L 52 is connected to a pulley 54.
55 via a spring 56. The pulley 55 is rotated by a motor 58, and the distance between the pointers 51 and 52 is changed by driving the motor 58 according to the determined copyable range in the X direction. It looks like this.

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. When the copy key 301 is pressed, the first carriage 411 is first moved toward the second carriage 412, and then the lamp 4 is turned on and moved away from the second carriage 412. When scanning of the original is completed, the lamp 4 is turned off and the first carriage 41
1 is returned to the home position.

FIG. 9 shows a drive mechanism for the variable magnification lens block 8. As shown in FIG. The motor 31 rotates a lead screw 61 disposed along the moving direction (y direction) of the first carriage 411. This lead screw 61 has a pusher z6 provided at one end of the board 62.
31 and 632 are screwed together, and the lead screw 61
When the is rotated, the substrate 62 is moved in the y direction. A guide member 62+ffi is provided at the (l!! end of this board 62, and this guide member 62!
4 in a slidable manner. Further, the substrate 62 is provided with a movable body 65 which is movable in a direction perpendicular to the substrate 62 (X direction) and has the variable magnification lens block 8 attached thereto. That is, supports 6 are provided at both ends of this moving body 65.
51.652 are provided, and 'this support 651.
Reference numeral 652 denotes guide members 66e and 66 provided on the substrate 62.
Guided and held by 2. In addition, the said support i temple body 6
5! A rack 653 is provided on the longitudinal side surface of the rack 653, and the front &! A pinion 68 rotated by a pulse motor 67 provided on the base plate 62 is engaged. Therefore, the variable power lens block 8 is moved in the X direction by driving the motor 67. The microswitches 69r and 692 are for detecting the initial positions of the substrate 62 and the moving body 65, respectively.

Next, the relationship between the operation of the variable magnification lens block 8 and the image formed will be explained. In FIG. 10(a), the focal length of the variable magnification lens block 8 is f, and the optical path length from the document table 2 to the variable magnification lens block 8 is ya1. Assuming that the optical path length is yb and the total optical path length from the document table 2 to the photosensitive drum 10 is yc, the optical formula is expressed as follows.

1/f-1/ya, +1/yb Also, the magnification is expressed as yb/Va. Since the focal length f of the variable power lens block 8 is constant, it is understood that in order to focus during variable power, it is necessary not only to change the total optical path length yc but also to change ya or yb. This ya, yb
can be changed by moving the variable power lens block 8 in the X direction. Further, the total optical path length yc can be changed by moving the second carriage 412 and changing the position of the mirror 6.7.

On the other hand, as shown in FIG. 10(b), the distances between the document table 2, the lens block 8 for variable magnification, and the photosensitive drum 10 are kept constant, and the lens block 8 for variable magnification is moved in the X direction by a motor 67, for example, by a distance x When the image on the photosensitive drum 10 is moved by 1, the image on the photosensitive drum 10 is moved by a distance x 2 expressed by the following equation.

X 2 = X I In this way, by moving the variable magnification lens block 8 in the X direction, the center of the copied image can be moved.

FIG. 11 shows the overall control circuit.

The main processor group 71 detects inputs from input devices 75 such as the operation panel 30 and various switcher sensors, for example, the cassette size detection switches 601 and 602, and drives the various chargers, the voltage transformer 76, and the static eliminator lamp. 28, blade solenoid 27a1 of the cleaner 27; heater 23a1 of the pair of constant inspection rollers 23;
The exposure lamp 4 and each of the motors 31 to 40.5
8 etc. to perform the above-mentioned copying operation,
Spot light source 131, pulse motor 135, memory 14
0, erase array 150. It controls the array drive unit 160 and the like to perform an operation of erasing unnecessary portions of the document. Note that the spot light source 131, pulse motor 135, erasing array 150, and array drive unit 16o1 memory 140 will be described later.

Among the above motors 31 to 40.58, motor 35.37
．． A toner motor 77 that supplies toner to the developing unit 40 and the developing device 12 is controlled by the main processor group 71 via a motor driver 78.
are controlled by the first sub-processor group 72 via the pulse motor driver 79, and the motors 36.39, 38.58
is controlled by the second sub-processor group 73 via the pulse motor driver 80. Further, the exposure lamp 4 is controlled by the main processor group 71 via the lamp regulator 81, and the heater 23a is controlled by the main processor group 71 via the heater control section 82. Then, from the main processor group 71 to the first and second sub-processor groups 72.7
Drive and stop commands for each motor are sent to the first motor. Second
From sub-processor group 72 and 73 to main processor group 7
1, a status signal indicating the driving or stopping state of each motor is sent. The first sub-processor group 72 also includes a position sensor 83 that detects each initial position of the motors 31 to 34.
Location information has been entered from.

FIG. 12 shows an example of the configuration of the main processor group 71. One-chip microcomputer 91 (hereinafter referred to as
The microcomputer (simply referred to as a microcomputer) detects human power on keys on an operation panel (not shown) and performs various display controls via an input/output board 92.

Furthermore, the microcomputer 91 is expanded by input/output ports 93-96. A high voltage transformer 76, a motor driver 78, a lamp regulator 81, and other outputs are connected to the input/output boat 93.
4 is connected to a size switch for detecting the paper size and its relaxation input, and the input/output port 95 is connected to a copying condition setting switch and other human power. Note that the input/output port 96 is an option.

FIG. 13 shows an example of the configuration of the first sub-processor group 72. The microcomputer 101 is the main processor group 7
1 is connected. Programmable interval
The timer 102 controls the phase switching interval time of the pulse motor. When a set value is set from the microcomputer 101, the timer 102 starts counting reference clock pulses based on the setting value. When the timer 102 has counted out, the end pulse is sent to the microcomputer 101. It is configured to output to the interrupt line. The microcomputer 101 also includes the position sensor 8.
Position information from 3 is input, and input/output boats 103 and 104 are connected. The input/output boat 104 is connected to the motors 31 to 34.135 via the pulse motor driver 79. still,
The input/output board 103 is used, for example, when outputting status signals of each pulse motor to the main processor group 71.

FIG. 14 shows the configuration of the second sub-processor group 73. The microcomputer 111 is connected to the main processor group 71
is connected to. The programmable interval timer 112 controls the phase switching interval time of the pulse motor, and when a set value is set from the microcomputer 111, it starts counting reference clock pulses based on it, and when the count is out, it starts counting the end pulse. It is designed to be output. This termination pulse is latched by the latch circuit 113, and its output is supplied to the interrupt line and input/output board input line of the microcomputer 111. Further, an input/output boat 114 is connected to the microcomputer 111, and this input/output boat 114 is connected to the pulse motor driver 8.
Motors 36.38.39.58 are connected via 0.

Figure 15 shows the control circuit of the pulse motor.
The input/output boat 121 (corresponding to the input/output boats 104 and 114 in Figs. 13 and 14) has a pulse motor driver 1.
22 (corresponding to the pulse motor driver 79.80 in FIG.
6.38.39: Equivalent) 171 & Volume 111A, B, A
, B are connected.

FIG. 16 shows a method for controlling the speed of a pulse motor, in which (a) is a speed curve of the pulse motor, and (b) is a phase switching interval.

As is clear from this figure, the phase switching interval is long at the beginning;
They gradually shorten, then become evenly spaced, then gradually lengthen again, and then stop. In other words, this indicates the through-up and through-down of the pulse motor, starting from the self-starting region, being used in the high-speed region, and finally falling down. Note that tl, t2...tX indicate the time of the phase switching interval.

Next, the document image erasing means will be explained.

17 and 18, the first carriage 411 is provided with a guide shaft 130 along the lamp 4 in the part where the light of the lamp 4 is blocked, and this guide shaft 130 has a guide shaft 130 for marking the erasing range of the document. Spot light source 1 as a means of giving instructions
31 are provided in a movable manner. This spot light source 131 is, as shown in FIG.
The light generated by the lens 133 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) 13 disposed along the guide shaft 130.
It is connected to 4. This timing belt 134 is passed between a pulley 136 provided on the rotating shaft of a pulse motor 135 and a driven pulley 137.

Therefore, by rotating the pulse motor 135, the spotlight 111131 is directed to the first carriage 41! is moved in a direction perpendicular to the scanning direction.

Further, a position sensor 138 consisting of a micro switch for detecting the initial position of the spot light source 131 is provided in the first carriage 411 located at the end of the guide shaft 130 on the pulse motor 135 side.

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

Next, a method of specifying the erasing range of a document using the spot light source 131 will be explained using FIGS. 19 to 21. This spot light source 131 is the operation key 30a.
When ~30d is operated, the light emitting element 132 is moved in a lit state. That is, when the operation keys 30b and 30d are pressed, the motor 33 is driven, and the first carriage 411 and the spot light source 131 are moved in the scanning direction (the direction of the arrow y shown in FIG. 19). In addition, operation keys 30a, 30c
When you press , the motor 135 is driven and the spot light source 13
1 is moved in a direction perpendicular to the scanning direction (direction of arrow X shown in FIG. 19). The operator operates the operation keys 308 to 30d while visually viewing the spot light transmitted through the original IG, and presses the position designation key after moving the spot light to 81 points on the original IG shown in FIG. 20(a), for example. Press 30e. Then, the coordinate position specified by this Sl is stored in the main processor group 71 shown in FIG. In the same way, move the spotlight to 82 points on the original iG and press the position designation key 30.
When e is pressed, the positions of 82 points are stored in the main processor group 71. The position of this spot light can be detected, for example, by counting the number of drive pulses of the pulse motor 33.135. After this, erase range specification key 30f
When is pressed, a rectangular area (indicated by diagonal lines) with the 32nd point St 2 as the diagonal point is designated as the erasing range, as shown in Fig. 2 (a). Still, as shown in FIG. 20(b), specify the 83 points and 1.84 points of the original G, and press the erase range specifying key 3.
When 0o is pressed, the area other than the square with 83.84 points as diagonal points is designated as the erasing range. In this way, when you press l on the erasure range specification keys 30f and 30, the specified 2
Calculations are performed by the main processor group 71 based on the position of the point and the copying magnification, and the memory 140 stores a high level signal "1" in the erase range part and a low level signal "0" in the other part. . That is, this memory 140 is, for example, a RAM whose capacity in each column direction is approximately equal to the moving distance of the spot light source 131 in the X direction divided by the position resolution in the y force direction.
20(a) as shown in FIG. 21(a), and in the case of FIG. 20(b) as shown in FIG. For example, as shown in FIG. 21(b), high level signals are stored in addresses corresponding to the shaded areas, and low level signals are stored in other addresses.

In this case, the original is set with the copy side facing up, and after the erasure range is specified, it is turned over along the fixed scale 21 of the original table 2. Therefore, as shown in FIG. 21, the information stored in the memory 140 is also actually inverted in the column direction.

On the other hand, as shown in FIG. 22, an erasing array 150 serving as erasing means is provided close to the photosensitive drum 10, for example, between the charger 11 and the exposure section Ph. As shown in FIGS. 23 and 24, this erasing array 150 has a plurality of light shielding cells 151 arranged in a direction perpendicular to the rotational direction of the photoreceptor drum 10, and each light shielding cell 151 has a plurality of light shielding cells 151 arranged therein. A light emitting element 152 made of, for example, a light emitting diode as shown in FIGS. 25(a) and 25(b) 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 . The number of light emitting elements arranged in this erasing array 150 matches, for example, the capacity of the memory 140 in the column direction. Here, 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. 26, this array driving section 160 includes a shift register 161 having the same number of pits as the number of bits 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 of the light emitting elements 152 constituting the erasing array 150 is connected to each cathode. The anode of each of these light emitting elements 152 is connected to the power supply VCC through a current limiting resistor R, respectively.

After specifying the erase range of the original as described above, when the original cover 11 is closed and the copy key 301 is pressed, the first carriage 411 and the photosensitive drum 10 are operated, and the memory 140 is moved in the row direction. (shown in FIG. 21), one column of data is sequentially read out. This read data D1 is transferred to the shift register 161 of the array driving section 160 in response to the clock signal CLK. After one column of data has been transferred to the shift register 161,
The charged portion of the photoreceptor drum 10 forms an erase array 150.
When the latch signal LTH is reached, the main processor group 71 outputs the latch signal LTH, and the data stored in the shift register 161 is supplied to the store register 162 in response to this signal. That is, the erase array 150 includes the charger 11 and the exposure section Ph.
For example, one row of data output from the memory 140 is arranged between the erase array 150 and
Assuming that the angle of exposure portion Ph is θ1 and the photosensitive drum 1o is rotating at each speed, the latch signal LTH is set so that it is supplied to the store register 162 before θ1/ω.
output timing is controlled.

Each switch element 163 of the switch circuit 164 is controlled by the output signal of the store register 162. That is, when the output level of the store register 162 is high level, it is turned on, and when it is low level, it is turned off. As a result, the light emitting elements 152 connected to each switch element 163 are turned on when the switch element 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. It means that it was done. Thereafter, the data in the memory 140 is read out column by column in the same manner, and the image is erased.

Next, the underline forming operation will be explained.

When forming an underline, first place the original on the original platen 2.
, and press the underline designation key 30h to put the main processor group 71 into the underline designation mode. Thereafter, in the same manner as the erasure range specification operation described above, the operation keys 30a to 30d and the position specification key 30e are operated to specify a portion on the document where an underline is to be formed. FIG. 29(a) shows an example of this, and 5a-
The range specified by Sb and Sc to Sd is the range in which an underline is formed. After specifying the range in this manner, when the copy key 301 is pressed, the exposure lamp 4 is first turned on to expose the original, and a normal copying operation is performed. When this copying operation is completed, the multiple copying unit 6
03 is operated, and the paper on which the original image has been formed is again sent to the photosensitive drum 10 side. Paper is on photoreceptor drum 1
0(ll), the photosensitive drum 1o is driven,
The fed paper is fed in synchronization with this timing. Thereafter, the erasing array 150 is controlled to light up according to the specified range. In this case, light emitting elements 152 outside the designated range are lit. At this time, the exposure lamp 4 is turned off and no exposure operation is performed on the document. Therefore, the surface charge of the photoreceptor drum 10 is left only in the specified range, and the other parts are erased. This photosensitive drum 10
The electrostatic latent image formed is developed by a developing device 12. FIGS. 27 and 28 show an example of this, in which the underline is developed on the photosensitive drum 10. FIG.

As described above, the underline L developed on the photosensitive drum 10 is transferred to the fed paper, and then fixed and discharged. Therefore, this paper contains Figure 29 (
As shown in b), an underline L is formed in the designated range.

Next, the gist of the invention will be explained.

The arrangement pitch P of the light emitting elements 152 constituting the above-mentioned erasing array 150 is, for example, 2 mm. On the other hand, the spot light source 131 is activated by a single pulse signal supplied to a pulse motor 135 that drives the spot light source 131.
For example, they are moved at a pitch of about 0.2 mm. Therefore, as shown in FIG. 1(a), the spot light Se.

When the light emitting element 152a of the erasing array 150 is turned off at the underline formation position specified by Sf, the formed underline L may overlap the original image, as shown in FIG. . Therefore, in the main processor group 71, the moving position of the spot light source 131 is detected, and the detected moving position is compared with the positional relationship of the light emitting elements 152 of the erasing array 150 to control the underline formation position. It is now possible to do so. That is, when the underline specification mode is set, the main processor group 71 executes step ST1 shown in FIG.
, the moving position of the spot light source 131 is detected from the number of pulses supplied to the pulse motor 135. This movement position 11PL is determined by PL-PnxO, 2 mm, where Pn is the number of pulses supplied to the Vamos motor 135. In step ST2, the determined movement position @PL of the spot light source 131 and the pitch P of the erasing array 150 are compared, and the error Ep between them is determined as Ep-'PL/P. For example, if 11 pulse signals are supplied to the pulse motor 135, 1. This error Ep is 0.2m
m. Thereafter, in step ST3, the variable magnification lens block 8 is moved along the fixed scale 21 based on the obtained error EO. That is, when the error Ep is Q2 mm, the variable magnification lens block 8 is driven so that the original image moves upward along the fixed scale 21 by Q2 mm. Thereafter, in step ST4, the original image is moved by the movement distance with respect to the paper P, and a copying operation is performed. In other words, this corresponds to copying by shifting the paper P as shown by the dotted line in FIG. 1(C). Thereafter, in step ST5, the paper on which this copying operation has been performed is conveyed again to the transfer section by the multiple copying unit 603, and in step ST6, the underline forming operation described above is performed on the conveyed paper P. It will be done. Therefore, for this @P, the first (
As shown in d), an underline is formed in the designated portion of the original image, and the paper P is ejected in step ST7, and the process is completed.

According to the above embodiment, the movement position of the spot light source is detected, the error between the detected movement position and the arrangement pitch P of the light emitting elements 152 constituting the erasure ray 150 is detected, and the change is made based on this error. By moving the magnification lens block 8, the position where the original image is formed relative to the underline is moved.

Therefore, it is possible to form an underline at a designated position on the original image without being limited by the erasing pitch of the erasing array 150.

In the above embodiment, the original image is first copied after specifying the underline. However, the present invention is not limited to this, and the underline may be formed first, and then the original image is copied.

Furthermore, the arrangement position of the erasing array 150 is not limited to that shown in FIG. 22, but as shown in FIG. It is also possible to configure the data to be erased by

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

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to provide an image forming apparatus capable of forming an underline without overlapping the original image.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of an image forming apparatus according to the present invention, and FIG. 2 is a plan view of main parts shown to explain the underline forming operation, and FIG. 2 is a diagram shown to explain the operation. , 3 and 4 show the configuration of the image forming apparatus, FIG. 3 is an external 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 section, 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. FIG. 10 is a perspective view of the main parts showing the drive mechanism of the magnification lens block. FIG. 10 is a diagram shown to explain the operation of the magnification lens block. FIG. 11 is a configuration diagram showing the overall control circuit. The cause is the configuration diagram of the main processor group, and Figure 13 is the configuration diagram of the first sub-processor group.
Figure 4 is a configuration diagram of the second sub-processor stage, Figure 15 is a schematic configuration diagram showing the III 10 circuit of the pulse motor, and Figure 16 is a diagram showing the configuration of the second sub-processor stage.
The figure is a diagram shown to explain the speed control method of the pulse motor, FIG. 17 is a perspective view of the main part showing the spot light source,
Figure 8 is a side cross-sectional view of the main part showing the spot light source, Figures 19 and 20 are plan views shown to explain the operation of specifying the erasing range of the original using the spot light source, and the 21st factor is the contents of the memory. FIG. 22 is a side sectional view of the main part showing the arrangement of the erasing array, FIG.
Figure 4 shows the relationship between the erasing array and the photosensitive drum, Figure 23 is a perspective view showing only the main parts, and Figure 24 is a perspective view showing only the main parts.
The figure is a front view showing only the main parts, FIG. 25 shows the configuration of the erasing array, FIG.
) is a partially cutaway front view, FIG. 26 is a circuit diagram showing the configuration of the array drive section, FIG. 27 is a front view of the main part shown to explain the underline forming operation, and FIG. 28 ( a
) is a side sectional view showing the main part of FIG.
7 is a front view showing the main part, FIG. 29 is a diagram showing an example of an underline forming operation, and FIG. 30 is a side sectional view of the main part showing another example of arrangement of the erasing array. DESCRIPTION OF SYMBOLS 1... Main body, 2... Document table, 10... Photosensitive drum, 30... Operation panel, 308-30d... Operation key, 30e... Position specification key, 30f, 30o.・
- Erase range specification key, 30h... Underline specification key, 71... Main processor group, 131... Spot light source, 132... Light emitting element, 133...
- Lens, 135... Pulse motor, 140... Memory, 150... Erasing array, 152... Light emitting element, 153... Lens, 160... Array drive unit, P
...Paper, pH...Exposure section. Applicant's representative Patent attorney Takehiko Suzue Chopsticks 2, etc. 30 Figure 6 Figure 14 Figure 15 Figure 18 Figure 19 (a) (b) (a) (b) Figure 21 Figure 22 Figure 30 ( a) (b) 15'0 Figure 26 Figure 27 Figure 28v! J (a) Figure 29 (b)

Claims (2)

[Claims] (1) A scanning device that optically scans a document placed on a document table, an image carrier on which an optical image guided by the scanning device is formed, and a document image formed on the image carrier. and a transfer means for transferring an image corresponding to the image to a transfer material, a changing means provided between the scanning means and the image carrier to change the position of the original image formed on the image carrier. and an indicating means provided on the scanning means and movable in a direction orthogonal to the moving direction of the scanning means for indicating a predetermined range of the document by transmitted light, and a plurality of light emitting elements arranged along the image carrier. an erasing unit that selectively turns off the light corresponding to the specified range during image formation, leaving the image in the specified range with a predetermined width and erasing the image in the other range from the image carrier; An image forming apparatus comprising: a control means for detecting an error between a moving position of the instruction means and a turn-off position of the erasing means, and driving the changing means in accordance with the detected error. (2) The image forming apparatus according to claim 1, wherein the movement pitch of the instruction means is narrower than the arrangement pitch of the light emitting elements constituting the erasing means.