JPS61246771A - Image forming device - Google Patents

Abstract

PURPOSE:To form characters or the like with different colors by specifying the optional range of an original, erasing images on the inside or outside of a specified range and generating patterns such as characters. CONSTITUTION:When a black original is set up on an original platen, a black original specifying key and a red character writing specifying key are depressed and a red character writing specifying mode is set up in a main processor group 71, an exposing lamp 4 lights up and normal copying operation is executed. Then, a driving unit is operated, paper on which the black original picture is formed is sent again to a photosensitive drum and the lighting of light emitting elements is controlled by an erasing array 150 in accordance with the specified range. Namely, the light emitting elements in the specified range are turned off in accordance with data stored in a pattern memory 170. At that time, the lamp 4 is also turned off and exposing scanning of the original is not executed. Thereby, the surface electric charge of the drum is left only in the specified range and erased in the other part. A electrostatic latent image formed on the drum is developed with red toner and transferred, so that numerals, characters, codes, etc. are formed and fixed on the specified range of the paper.

Description

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

[Technical background of the invention and its problems]

Generally, an electronic copying machine has a function of copying an original image onto paper as is, or enlarging or reducing the original image and making a copy.

Incidentally, a document image may include unnecessary portions or five enlarged or reduced portions. However, conventional copying machines cannot erase parts of the original image or enlarge or reduce the original image to make copies, and they are also unable to write the required numbers, letters, and other characters and symbols in the necessary areas. It was impossible.

[Purpose of the invention]

This invention has been made based on the above circumstances, and its purpose is to be able to selectively erase any part of a document image, and to add required characters and symbols to the required parts. An object of the present invention is to provide an image forming apparatus capable of forming images such as those in different colors.

[Summary of the invention]

This invention includes, for example, multiple copying functions for originals, multicolor development functions,
Using the function to specify an arbitrary range of the manuscript, the function to erase images within and outside the specified range, and the function to generate patterns of characters and symbols, you can add the required numbers, letters, etc. to the specified part. There are nine pieces that can be formed in different colors.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. Figs. 1 and 2 schematically show an image forming apparatus, such as a copying machine, of the present invention.

In other words, 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. Near the document table 2, a document cover 11 that can be opened and closed and a work table 1 are provided. The original set on the original platen 2 is processed by the exposure run f4 and the optical system 3 consisting of mirrors s, g, and r reciprocating in the direction of arrow a along the lower surface of the original platen 2. Exposure scanning is performed during reciprocation. In this case, mirror 6.7 moves at the speed of the ring 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 lander 4, is reflected by the mirror 5.6.1, passes through the variable magnification lens block 8, and then passes through the mirror 9. ．． ．．
9. ．． It is reflected by 9sK and guided to the photoreceptor drum 10, so that an image of the document is formed on the surface of the photoreceptor r ram 100.

The photosensitive drum 10 rotates in the direction of arrow C, and the surface thereof is first charged by a charging device 11, and then the other side of the document is exposed to slit light, thereby forming an electrostatic latent image. This electrostatic latent image, for example, contains red and black toners, respectively, and becomes visible when the toners are deposited by developing devices 121 and 121 that are selectively operated as required. It's like K. On the other hand, the paper (image forming object) P is stored in the selected upper paper feed cassette, ) 1 '
1s middle paper feed cassette 13. .

Alternatively, the feed roller '41 from the lower paper feed cassette 13m
．． 14, 148 and roller pair 151° 15g, 1
5. The sheets are taken out one by one at the paper guide path 1g, 1g, .
163, and is guided to a pair of registration rollers 17, and sent to a transfer section by the pair of rollers 17. Here, each of the above paper feeds tF”1 #13!12
31 is removably provided at the lower right end of the main body 1, and either one can be selected in the operation/9 panel described later. In addition, each of the above paper feed cassettes 1
31 *132 e13B each has a cassette size detection switch, Chiro 01.

The cassette size is detected by 60s and 60sVc. This detection switch 601.

60, 160s 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, since the paper P sent to the transfer section comes into close contact with the surface of the photoreceptor drum 100 at the transfer charger 18,
The toner image on the photoreceptor drum 10 is transferred by the action of the charger 18. The transferred paper P is peeled off from the photoreceptor drum 10 by the action of the peeling charger 19 and conveyed on the conveyor belt 20. , and is sent to a fixing cylinder-ra pair 21 as a fixing device provided at the terminal end thereof, and the transferred image is fixed by passing therethrough. Then, the paper P after fixing is
The paper is ejected from the paper ejection tray 2511C outside the main body 1 by a pair of delivery rollers 22, a vibrator 23 operated as shown by the solid line, and a pair of ejection rollers 24. Further, after the transfer, the photoreceptor drum 10 is configured so that residual toner on the surface thereof is removed by a cleaner 26, and any residual image is erased by a static elimination lamp 27, thereby returning to the initial state. Note that 29 is a cooling fan for preventing the temperature inside the main body 1 from rising.

On the other hand, a double-sided multiple copying unit 211 is provided below the copying machine main body 1, which makes it possible to perform double-sided copying on one sheet of paper or multiple copies on the same side. This uniform)
JJIC has the above-mentioned sorting port 23 and paper ejection roller pair 2.
Including 4, the above distribution? -) j A plurality of roller pairs jtlb, 21a, and 211tl are provided to guide the sheets taken in by J to the stacking section 28a. Further, the stacking section JJa is provided with a delivery roller 28 for sending out the paper temporarily stored in the stacking section 28a. This feed roller 28e is adjusted to the thickness (number of sheets) of the stored paper.
It can be moved up and down as shown by the arrows in the figure.

The paper sent out by the delivery roller 28
It is guided to a control unit r-) 28g via a pair of separation rollers 211f that separates and sends out the sheets one by one. This control r-)
When performing multiple copying, the roller 28g is rotated in the direction of the arrow M shown in the figure, as shown by the dotted line, to guide the paper to the pair of registration rollers 17 via the pair of transport rollers 28h and the paper guide path 251. Further, when double-sided copying is performed, the state shown in the figure is used, and the paper is guided to the reversing section 28 via a pair of transport rollers 28J. Paper is inverted part zt
When ttK is stored, is it controlled? -) 28g is rotated in the direction of arrow T in the figure, and guides the paper sent by the pair of transport rollers 28j to the pair of registration rollers 12 via the pair of transport rollers 28h1, paper guide path t8t.

In this embodiment, only the multiple copy function of the double-sided multiple copy unit 28 is used. Figure 3 shows the main body IK.
It shows the operation/main channel 30 provided. 301
30 is a copy key that commands the start of copying, 30 is a numeric keypad that is used to set the number of copies, etc. 303 is a display unit that displays the operating status of each part and paper jams, etc. 304 is an upper and lower paper feed cassette 13, 14 Skein to select.

3011 is a cassette display section that displays the selected cassette; 306 is a magnification setting key that sets the magnification and reduction magnification of the copy in a predetermined relationship; 30γ is a zoom key that sets the magnification and reduction magnification steplessly; 30s is a display unit that displays the set magnification; 30. 30m, 30b, 306, and 30d are operation keys for moving a spot light source that indicates the erase position of the original, which will be described later. 30. is a position specification key for inputting the coordinate position indicated by the spot light source. , J' f #sag are erase range specification keys that specify the erase range at specified positions, and JOh is, for example, the developer 1 containing black toner.
A black original designation key is used to designate two black originals, and 301 is a developing device 121 containing red toner.
30J is a red character writing designation key to designate writing of red numbers, letters, etc. characters and symbols on the paper on which the black image will be formed. , JOk is a black character writing designation dF that specifies writing of black characters/symbols on the paper on which the red image is formed.
+, 30L, 30m are each character writing designation key 30
3.30 is a width display section that displays the operating status.

FIG. 4 shows an example of the drive source configuration of each drive section of the copying machine configured as described above, and is configured with the following Tanabata. That is, numeral 31 is a lens motor, which is a motor for moving the position of the lens aperture 8 for changing the magnification. Reference numeral 32 denotes a mirror motor, which is a round motor that changes the distance (optical path length) between the mirror 5 and mirror 6.2 for zooming. 33
is a scanning motor, which connects the exposure land 4 and mirror 5;
This is a motor for moving the mirror 6.7 for scanning the original. A shutter motor 34 is a motor for moving a shutter (not shown) for adjusting the charging width of the photosensitive drum 10 by the charger 11 during zooming. 351m35N is a motor for shallow soaking, and is a motor for driving the developing roller and the like of the shallow soaking device 121*Z2B.

A drum motor 36 is a motor for driving the photosensitive drum 10. Reference numeral 31 denotes a fixing tanabata, which is a motor for driving the paper transport path 22, the pair of fixing rollers 2S, and the pair of paper discharge rollers 24. A paper feeding motor 38 is a motor for driving the delivery rollers 15, 1g. 39 is a paper feed motor, which is a motor for driving the reso roller pair 19; 40 is a fan motor, which is a motor for driving the cooling fan 29; 401 is a motor for driving the feed roller 28; be.

FIG. 5 shows a drive mechanism for moving the optical system 3 back and forth. That is, the mirror 5 and the exposure lamp 4 are supported by the first carriage, 4th axis, and the second carriage, 6th and 7th, respectively, and these carriages 411° and 41 are supported by the guide rail 421*. 4j
It is guided by the snow and can move in parallel in the direction of arrow a. That is, the 4-phase delta pulse motor 33 drives the pulley 43. An endless belt 45 is stretched between the pulley 43 and the idle pulley 44, and an endless belt 45 is placed in the middle of the belt 45 to support the mirror 5. One end of the 1st gear and the 4th one are fixed.

On the other hand, the second carrier supporting the mirror 6.1, y41 mushroom rail 471 o guide i4 e;
Two pulleys 47.degree. 41 are rotatably provided apart from each other in the axial direction of the pulleys 47 and 41, and a wire 48 is stretched between these pulleys 4F and 4F.

One end of this wire 48 is fixed to a fixed part 49Vc, and the other end is fixed to the fixed part 49 via a coil spring 50, respectively. M9, xi carry, zo 41 in the middle part of the wire 48! One end is fixed. therefore,
/By rotating the null smoke 33, the belt 45
rotates and the first carry, Zo 41! moves, and along with that, tx2 carries and ji41m also move. At this time, since the D IJ 4 r and t y serve as movable pulleys, the second C 41!
move in the same direction at the speed of the gutter.

In addition, 1. The moving direction of @2 carry and zo 411m 41B is particularly controlled by switching the rotational direction of the -sis motor 33.

Further, on the document table JK, a copyable range corresponding to the specified paper is displayed. That is, the paper size specified by the paper selection key 304 is set to P, Py, and the copy magnification specified by the magnification setting keys 30, 30γ is set to K.
Then, the copyable ranges x and y are as follows. Of these copyable ranges x and y, the X direction is indicated by the pointer 51°12 provided on the back of the document table 2, and the y direction is indicated by the scale provided on the top surface of the gx * spear, zo 41 layer. 531C.

Above guidelines 11. As shown in FIG. 6, s2 is the pulley 14.
Nine wires srK are provided between the Is and the wires srK, which are suspended via a spring 56. The pulley 55 is rotated by a motor 58.
When the rotation of the pointer s1. is driven according to the paper size and magnification, the pointer s1. In addition, the first carriage 411 is set to a predetermined position (home position according to the magnification, It is a trap to move to Then, when the copy key 301 is pressed, the first
Kyari, Zo41. Ia, first, the second carriage is moved in the direction of snow, and then the land 4 is turned on and the second carriage 41 is moved in the direction away from the snow.

When scanning of the original is completed, Lande 4 is turned off and the first
The carry position 411 is returned to the home position.

tx7 shows the overall control circuit, which includes a main processor group 71 and a first processor group 71. It mainly consists of a second processor group rz and rs. The main processor group 71 is
Operation I4 channel 3o and various switches and sensors, such as the cassette size detection switch 60. ．． 60. A high-voltage transformer 76 that detects inputs from input devices 75 such as the like and drives the various chargers, the static eliminator 27, the solenoid 26a of the cleaner 26, and the heater 21a of the pair of fixing rollers 21.

The exposure ladder 4 and each of the motors S1 to 40.
5g, fj'l, 7!7, etc. to perform the above-mentioned copying operation, and also control the sudette light sources J J J , z4
erase motor 135, erase array 15o.

It controls the array drive unit 160, the meso 140, etc. to erase unnecessary portions of the document.

In addition, the light source 131, the main pulse motor 135, the erase array 150, the array drive unit 160.11%,
The Δturn memory 110 will be described later.

Among the motors 31 to 40.58, motor Is, 3'
The toner motor 77 that supplies the toner (1, 40.401 and the developing device 121
The motor 3 is controlled by the main processor group 11 via the
1 to 34 and 6f/, 135 are controlled by the first group 22 through the /4 motor driver 29, and the /4 motor driver z489 is controlled by the /4 motor driver 29. It is controlled by the second setter setter group 7J via the second setter setter group 7J. The exposure sensor 4 is controlled by the main processor group 71 via the sensor regulator 81, and the heater 211 is controlled by the main processor group 21 via the heater control section 82.
1 to 1st. The drive and stop commands for each Tanabata are sent to the second processor group 72.13. Second sub-derose, group 72. '13 sends the status indicating the drive/stop state of each motor to the main processor group 71.

Further, the first processor group yxVc includes motors 31 to
34.6'/.

Position information from the position sensor 83 that detects each initial position of 135 is input! FIG. 8 shows an example of the configuration of the main process group 21. In other words, 91 is a one-chip microcombi, -
(hereinafter simply abbreviated as microcontroller), which is an input/output/
-) 9J is used to detect human input and control various displays on an operation panel (not shown), and the i icon 91 is expanded by input/output ports 93-96. And a high voltage transformer 76 for input/output /-1-93,
The motor dryer/478, the rande regulator 81, and other outputs are connected, the input/output port 94JIC is connected to the size switch that detects the paper size and its individual input, and the human output/-to 95Vc is connected to the copy condition setting switch and its individual input. Inputs etc. are connected. Also, input/output? - The port 96 is for use with an ODP.

FIG. 1M9 shows an example of the configuration of the first group 72. That is, 101 is a microcomputer, which is connected to the main processor group 71. 102 is the fcI Gramadel for the phase switching interval time system 61 of the /4 Luss motor.
It is an inter/9 timer, and when a set value is set from the microcomputer 101, it counts based on the set value, and when it counts out, the end timer is sent to the microcomputer 101.
Output to interrupt line 01. The timer 102 is inputted with a basic lock/reference signal. Further, the microcomputer 101 receives position information from the position sensor 83 and is connected to input/output ports 101 and 104.

The input/output/-) 704 is connected to the motors 31 to 34.6'1.
135 is connected. In addition, the above input/output/−toio
s is often used when outputting the status signal of each /4 pulse motor to the main transfer motor group 11.

FIG. 10 shows an example of the configuration of @2 Sade de Rose group 73. That is, 111 is a microcomputer, which is connected to the main controller group 71. 112 is a programmer del interface for controlling the phase switching interval of a pulse motor.
It is a 4 timer, and when a set value is set from the microcomputer 111, it counts based on it, and when it counts out, it outputs the end I4 timer.

This termination signal is latched by the latch circuit 113, and its output is supplied to the interrupt line and input/output date input line of the microcomputer 111. In addition, the input/output yje-to 114 is connected to the microcomputer 111Vc, and the input/output/
Motors 36° ss, sy, stt are connected to the motor 114 via the pulse motor driver 80.

Fig. 11 shows the control circuit of the pulse motor.
4. J1411C equivalent) /Narus Motor Rrai/4
x zz CK7 diagram O/mother motor driver '19.
8011C equivalent) is connected to this Δ Lus motor dryer z-t 722 / pulse motor 123 (the above /4 Lus motor 31-34, 36° 3g, 39.511.61,
135) are connected to each volume IIA, A, B, and B.

Figure 12 shows the speed control method of a pulse motor; (a) shows the speed curve of a /4 pulse motor, and (c) shows the phase switching interval.As is clear from this figure, At first, the phase switching interval is long, gradually shortens, eventually becomes equal, then gradually increases again, and then stops. That is,
This shows the slew-up and slew-down of the /4 Luss motor; it initially rises from the self-starting region, is used in the high-speed region, and then eventually falls. In addition, tl*tl・-
1x indicates the time of the phase switching interval.

Next, the means for erasing the original drawing will be explained.

In FIGS. 13 and 14, the first carriage, zo 411, follows the run f 4 to the part where the light from Land 4 was traced, and the f
An id shaft 110 is provided, and this id shaft has a voltage of 130V.
cl'i S/ as a means of instructing the erasure range of the manuscript,
) A light source 131 is provided movably. This spot light source 131! As shown in FIG. 14, the light emitting element 132 includes a light emitting element 132, such as a light emitting diode or a lamp, and a lens 133, which are provided opposite to the document table 2.
The light generated by
KI! [It is designed to be irradiated as a slit light with a diameter of d. This slit light has a brightness that allows it to pass through the document G set on the document table 2 and having a thickness of, for example, a draft. Also, step 4. The light source 131 is a timing belt (toothed bell h) 1 disposed along the guide r axis 130.
It is connected to 34. This timing belt 134 is connected to the pulley 13 provided on the rotating shaft of the /4 Luss motor 1350.
6 and the driven pulley 132. Therefore, by rotating the pulse motor 135,
) The light source 131 is moved in a direction perpendicular to the scanning direction of the first cylinder 411. Gai again? A position sensor 138 consisting of a microswitch that detects the initial position of the light source 131 is provided on the first cartridge 411 located at the end of the shaft 130 on the pulse motor 135 side.
For example, when the light source 131 is moved, the light source 131 first comes into contact with the position sensor 138 and the initial position is detected.

Next, a method for specifying the erase range of the original using the light source 131 will be described with reference to FIGS. 15 to 17. This spot light source 131 is moved especially when the aforementioned operation keys 30a to SOa are operated. That is, when the operation keys 30b and 30d are pressed, the motor 33 is driven, and the first cartridge 411 and the sub-light source 13 are activated.
1 is moved in the scanning direction (arrow y direction shown in FIG. 15) K. i, operation key J□a.

When 30e is pressed, the motor 135 is driven, and the spot light source 131 is moved in the direction perpendicular to the scanning direction (arrow ! direction shown in FIG. 15).

The operator operates the operation keys JOa to 30rl while visually observing the switch light transmitted through the document G, and moves the position designation keys 30 and 30rl, for example, while moving the switch light at point S1 on the document G shown in FIG. Press.

Then, the coordinate position designated by 81 is stored in the main data group 71Vc shown in FIG.

When the position designation key 30 is pressed while the S3 point on the document G is moved on the same machine, the position of the S point is stored in the main group 71. The position of this spot light can be particularly detected by counting the number of driving a4 pulses of the d-system motors 33 and 135, for example. After that,
When the erasure range designation key 30f is pressed, a rectangular area (indicated by diagonal lines) with the 81*S1 point as the diagonal point is designated as the erasure range, as shown in FIG. 16-).

In addition, as shown in Fig. 16(b) Ic, 83 points of manuscript G,
Specify 84 points and press the erase range specification key sog.
The area other than the square with 1.84 points as diagonal points is designated as the erasure range. In this way, the erasure range specification key 30
When you press f and 30g, calculations are performed in the main process group 11 based on the positions of the two specified points, and the memo 1
JJ417 has a high level signal '''IJ in the erase range part.
1, and a low level signal @0'' is stored in the other parts.

That is, in this memory 140, the capacity in each column direction is, for example,
．． The moving distance of the light source 131 in the X direction ÷ the positional dissolution degree in the X direction is approximately equal to the capacity in each row direction.
1, the movement distance in the y-direction ÷ the positional resolution degree in the 1-direction corresponds to the RAM K.
In the case of a), as shown in Figure 17, and in the case of Figure 16 etc., as shown in Figure 17(b),
A high level signal is stored in the rear edge corresponding to the shaded area, and a low level signal is stored in the rear edge area other than the tilt area.

In this case, the original should be placed with the copy side facing up.

After the erasure range is specified, the document is turned over along the fixed scale 21 of the document table 2.

Therefore, the information stored in the memo 1JJ40 shown in FIG. 17 is also actually stored inverted in the column direction.

On the other hand, as shown in FIG. 18, an erasing play 150 as erasing means is provided close to the photosensitive drum 10, for example, between the charger 1 and the exposure section Ph (shown in FIG. 2). As shown in FIG. 19, 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 100, and inside each of these cells 151 are shown in FIGS. As shown in the figure, a light emitting element 152 made of, for example, a light emitting diode is provided
Further, a lens 153 is provided in an opening facing the photoreceptor r-ram 10 of each cell 15 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 is matched, for example, with the capacitance in the column direction of the mesoli 1400. Here, if the distance between the light emitting elements 152 is W and the number is N, the total length of the erasing array 150 is Q-thickness NxW.

The erasing array 150 is the array driving section 1f;
It is driven by Vc. This array drive section 1σ0 is the second
As shown in FIG. 1, a shift register 161 having the same number of bits as the number of bits in the column direction of the memory 140, a store register 162 that holds the contents of this shift register 161, and on/off control by each output signal of this store register 162. The movable contacts 1631 of these switch elements 163 are grounded, and the fixed contacts 163b are connected to each of the light emitting elements (light emitting diodes) 152 constituting the erasing array 150. connected to each cathode. The anode-y of each of these light-emitting elements 152 is connected to the power supply V, 1! through a current-limiting resistor R, respectively. <Connected.

After specifying the erasing range of the original as described above, when the original cover 11 is closed and the copy key 301 is pressed, the first cartridge 411 and photosensitive drum 10 are operated, and the memory 140 is Data for K1 columns in the row direction (shown in FIG. 17) is sequentially read out. This read data DI is transferred to the shift register 161 of the array driving section 160 in response to the clock signal CLK. After one column of data is transferred to the shift register 161, the charged portion of the photosensitive drum 1o is transferred to the erase array 150V.
When C is reached, the main process, from group 7, outputs a child signal LTH, and in response to this signal, shift register 1
The contents of 61 are supplied to store register 162. That is, since the erase array 150 is arranged between the charger 11 and the exposure section Ph, one column of data output from the mesori 140 is, for example, arranged between the erase array 150 and the exposure section Ph.
Assuming that the angle h is θ and 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 1c of this store register 162.In other words, when the output signal of the store register 162 is at a high level, it is turned on, and when it is at a low level, it is turned off. It is said that As a result, the light emitting elements 152 connected to each switch element 16 JVc 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 subsequently exposed, no electrostatic latent image is formed, and the original image cannot be erased. It will be done. Thereafter, the data in the memory 140 is read out column by column in the same manner, and the image data is erased.

The pattern memory 170 also stores mother turns of characters, symbols, such as numbers and alphabets, generated by a turn generator consisting of a character generator, and outputs them to the main processor group 71 to output them to the erase array 15.
The light-emitting elements 152 other than those in the pattern are turned on so that a desired charge pattern remains on the photoreceptor drum 10.

Next, the main parts ic')I and q of this invention will be explained.

In the present invention, a desired range of the document is designated using the spot light source 131 described above, and numbers input from the numeric keypad 30 of the operation panel 30 are entered in the margin area of the paper on which the manuscript image has been formed. Alternatively, the number of turns of letters and symbols such as alphabets created by the light source 131 can be written in different colors.

That is, for example, set a black original on the document table 2, press the black original designation key 30h, and then press the red character writing designation key so.
Press 3 to set the main processor group 7 to red letter writing designation mode.

Next, press the numeric keypad 30 of the operation/4 panel 30 to input the required number, for example, °1. After that, use the operation keys 30a to 30tl to specify the position in the same manner as the erasure range specification operation described above. Operate key 30,
A portion where numbers are written (in the illustrated embodiment, the lower left margin portion on the document) is designated on the document. Figure 22(a) shows the -
For example, 8a-sb # 5b-8e e
8 e -8d wB e z The range specified by S is the range that forms the number @1''. After specifying the writing range in this way, when the copy key 301 is pressed, the main process 71, a low level signal is stored in the address corresponding to the writing range of the pattern memory 120, and a high level signal is stored in the other addresses.Then, from then on, the copying operation is performed according to the flowchart shown in FIG. It will be done.

That is, in step 8T, the exposure lamp 4 is turned on, the original is exposed and scanned, and a normal copying operation is performed. 22nd
Figure (b) shows a document G with paper PK formed by this operation.
This is a black image. When the copying operation is completed, the hyperactive copying unit 28 is operated at ST and DE ST, and the paper on which the black original image has been formed is again sent to the photosensitive drum 10 side. When the paper is sent to the photosensitive drum 10 side, the photosensitive drum 10 is driven in step ST3, and the fed paper is fed in synchronization with this drive.

This guy is Ste.

In step ST4, the erase array 15 is erased according to the specified range.
0 is controlled to be lit. That is, as shown in FIG. 24, the light emitting elements 152 corresponding to the range designated according to the data stored in the pattern memory 110 are turned off. At this time, the exposure run f4 is turned off and no exposure scanning of the original is performed.Therefore, the surface charge of the photosensitive drum 10 remains only in the specified range, and the other parts are erased. The electrostatic latent image formed on the photosensitive drum 10 is developed by a developing device 121 containing red toner. Figure 25 shows an example of this, where r, r
d This is an image corresponding to a designated area developed on the photoreceptor frame 10.

Incidentally, the light irradiated onto the photosensitive drum 10 from each light emitting element 152 of the erasing array 150 is shown in FIGS.
), it converges in the rotational direction of the photoreceptor drum 10,
It is diffused to some extent in the longitudinal direction of the photoreceptor drum 10.

Therefore, the width δ of the residual charge in the portion corresponding to the light-emitting element 152 that is turned off is slightly narrower than the width and width of the light-emitting element 152.As described above, the red image developed on the photoreceptor drum 101C is transferred to the fed paper PK in step STs, then fixed and discharged. Therefore, as shown in FIG. 22(b)K, on this paper P, an image of the number ""1#" is formed in red in the designated range.

Further, FIG. 22(e) shows an example in which an image of the number 12" is formed on the paper P, and furthermore, FIG.
Each example shows a version of A1.

According to the embodiment described above, a predetermined range of the document is specified by the spot light source 131, and the image of the specified range can be erased using the erasing array 150. Therefore, it is convenient when editing a manuscript.

9, S/y) By using the light source 131Vc, it is possible to designate any part of the document and write the required characters and symbols such as numbers and alphabets in different colors.

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

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 selectively erase any part of a document image, and also write characters and symbols such as numbers and alphabets in different colors in required parts. It is possible to provide an image forming apparatus capable of

[Brief explanation of drawings]

1 and 2 show an embodiment of an image forming apparatus according to the present invention, in which FIG. 1 is an overview perspective view, FIG. 2 is a side sectional view, and FIG. 3 is a configuration of an operation I4 channel. A plan view showing
FIG. 4 is a perspective view showing the structure of the drive unit, FIG. 5 is a perspective view schematically showing the drive mechanism of the optical system, FIG. 6 is a perspective view schematically showing the drive mechanism of the pointer, and FIG. A block diagram showing the overall control circuit, Fig. 8 is a block diagram of the main processor group, Fig. 9 is a block diagram of the first processor group, and Fig. 10 is a block diagram of the second processor group.
Figure 11 is a schematic diagram showing the control circuit of the delta motor, Figure 12 is a diagram for explaining the speed control method of the motor, and Figure 13 is the main part of the spot light source. FIG. 14 is a side sectional view of the main part showing the switch light source, FIGS. 15 to 17 are plan views shown to explain the operation of specifying the erasing range of an original using a spot light source, and FIG. Figure 19 shows the relationship between the erasing array and the photosensitive drum, respectively.
FIG. 18 is a perspective view showing only the main parts, FIG. 19 is a front view showing only the main parts, and FIG. 20 shows the configuration of the erasing array. (b) is a partially cutaway front view, FIG. 21 is a circuit configuration diagram showing the configuration of the array drive unit, and FIG. 23 is a flowchart showing the image forming operation, FIGS. 24(a) and 24(b) are explanatory diagrams of the main parts of the image forming part by the erasing array, and FIG. 25 is an image using the erasing array. 1 is an explanatory diagram showing a forming state. 1... Copying machine main body, 2... Document table, 10... Photosensitive drum, 12... 12... Developing device, 28... Multiple copying unit , g, 301-30d...operation keys, 30
...Position specification key, J Of e J Og...
Erase range specification key, 30b, 301...Color original specification key, soj, sok...Character writing specification key, 30
1.30ys...Display section, 131--Spot light source, 150--Erasing array, 170...Rear turn memo lJ%P...Paper, G...Original. Applicant's agent Patent attorney Suzue Takehikoj11 Figure 4 Prisoner 6jl1 10th prisoner Figure 14 Figure 15 Figure 16 (a) Figure 16 Figure 77 (a) (b) Figure 19 (a) (b) Figure 21 Figure 22 Figure 23 Figure 25

Claims (4)

[Claims] (1) The document placed on the document table is optically scanned by a scanning means that moves along the document table, and a reflected light image from the document is formed on a charged image carrier. In an image forming apparatus that forms an electric charge pattern, develops the electric charge pattern, and then transfers and fixes the electric charge pattern to a transfer material to form an image, a conveying means for conveying the transfer material on which the image is formed to the image carrier again. a plurality of developing means for selectively developing the charge pattern on the image carrier with different colorants; a specifying means provided in the scanning means for specifying an arbitrary range of the document using transmitted light; and image forming means. and a pattern generating means for generating a pattern such as a character or a symbol in the specified range. The image carrier from which the charges other than the pattern that has been applied has been erased is developed with another coloring agent selected by the developing means, and the other pattern is applied to the specified range of the transferred material conveyed by the conveying means. An image forming apparatus characterized in that an image is formed in the following colors. (2) The indication means is provided in the scanning 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 the original with spot light. The image forming apparatus according to item 1. (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. . (4) The image forming apparatus according to claim 1, wherein the pattern generator includes at least a character generator.