JPH01265274A - Image forming device - Google Patents

Abstract

PURPOSE:To obtain a low-priced device capable of eliminating the required part of an original image in simple constitution by providing an eliminating means the width of which is narrower than a range for the maximum image formation of an image carrier and moving said means to the specific position in the longitudinal direction of the image carrier. CONSTITUTION:A small writing unit 71 which is smaller than the maximum copying width of a photosensitive drum 10 is provided near the drum 10. An operation key responding to elimination is operated, and a spot light source is driven to specify a prescribed eliminated position. Then, the writing unit 71 is moved. When a copying key is operated in said condition, a range from the specified elimination starting position to the LED 71c of an LED array 71b is completely turned to lighting condition, and the electric charge of the photosensitive drum 10 is eliminated. Thus, a part of an original image can be eliminated by using the writing unit 71 simultaneously when the original image is formed.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention is applied to, for example, an electronic copying machine, and is particularly applicable to an image on which arbitrary characters can be written in addition to copying an original image. The present invention relates to a forming device.

(Prior Art) Recently, copying machines have been developed that are capable of specifying a portion of an original image and erasing the specified portion when copying the original.

In this type of copying machine, for example, a light emitting array consisting of a plurality of light emitting diodes and having the same length in the longitudinal direction of the photoreceptor drum is installed near the photoreceptor drum, and this light emitting array corresponds to the erasing range of the original. By selectively turning on the light, the charge on the photoreceptor drum is erased, and an original image is not formed on this portion.

With such a configuration, it is possible to selectively erase a desired portion of the original image.

However, the conventional configuration described above requires a light emitting array with a length similar to the length of the photoreceptor drum in the longitudinal direction.
The manufacturing cost was high.

(Problem to be Solved by the Invention) The present invention solves the problem that an expensive light emitting array is required when erasing a document image.
The objective is to provide an image forming apparatus that is capable of erasing a desired portion of a document image with a relatively inexpensive configuration.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a scanning means for exposing and scanning a document, an image carrier on which an image of the document guided by the scanning means is formed, and an image carrier for the image carrier. a developing means for developing the formed image;
In an image forming apparatus comprising a transfer means for transferring the developed image to a transfer material, the width is set to be less than the maximum image forming range of the image carrier, and the image carrier is irradiated with light. It is composed of an erasing means for erasing charges, and a moving means for moving the erasing means in the longitudinal direction of the image carrier.

(Function) The present invention provides erasing means having a width equal to or less than the maximum image forming range of the image carrier, and moves this erasing means to a desired position along the longitudinal direction of the image carrier by means of a moving means. With a simple configuration, it is possible to erase a desired portion of a document image, and the manufacturing cost is reduced.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIGS. 19 and 20 schematically show an image forming apparatus of the present invention, such as a copying machine. That is, 1 is a main body of a copying machine, and a document table (transparent glass) 2 is fixed to the upper surface of the main body 1 to support a document. The document table 2 is provided with a fixed scale 21 that serves as a reference for setting the document.
Furthermore, a document cover 11 that can be opened and closed is provided near the document table 2.
is provided. The original placed on the original platen 2 is moved back and forth by an optical system consisting of an exposure lamp 4 and mirrors 5, 6, and 7 along the lower surface of the original platen 2 in the direction of arrow a. It is designed to be exposed and scanned. In this case, mirror 6.7 moves at half the speed of mirror 5 so as to maintain the optical exposure length. 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 5.6.7. It is reflected by 91, 92, and 93 and guided to the photoreceptor drum 10, so that an image of the document is formed on the surface of the photoreceptor drum 10.

The photosensitive drum 10 rotates in the direction indicated by the arrow in the figure, and first, the surface is charged by the charging device 11, and then the image is exposed to slit light at the exposure section ph.
An electrostatic latent image is formed on the surface. This electrostatic latent image is
2, a toner is attached to the image to make it visible. The developing device 12 is detachably attached to the copying machine main body 1, and code information (not shown) indicating the color of the toner contained therein is provided on the side surface of the developing device 12. 12 is inserted into the copying machine main body 1, this code information is read by a sensor (not shown) on the copying machine main body 1 side, and the color of the toner can be determined.

On the other hand, the paper (transferring material) is delivered from the selected upper paper feed cassette 1311 or lower paper feed cassette 13□ to the feed rollers 141 and 142 and the roller pair 15. ．． 152, the sheets are taken out one by one, guided through paper guide paths 161 and 162 to a pair of registration rollers 17, and guided by this pair of registration rollers 17 to a transfer section.

Here, the paper feed cassettes 131, 13□ are removably provided at the lower right end of the main body 1, and one of them can be selected on the operation panel described later. In addition, each of the paper feed cassettes 13. ．． 132 are respective cassette size detection switches 60. ．． The cassette size is detected by 602. The cassette size detection switch 600.6o2 is composed of a plurality of microswitches that are turned on and off in accordance with the insertion of cassettes of different sizes.

Furthermore, a manual feed guide 13a is provided on the upper surface of the paper feed cassette 131.
The paper manually inserted through the feed roller 14a
The sheet is guided to the pair of rollers 151 by the roller pair 151, and is then conveyed in the same manner as sheets fed from the sheet feed cassette 131.

On the other hand, the paper sent to the transfer section comes into close contact with the surface of the photoreceptor drum 10 at the transfer charger 18, so that the toner image on the photoreceptor drum 10 is transferred by the action of the charger 18. . This transferred paper P is transferred to the peeling charger 1
The transferred image is electrostatically separated from the photoreceptor drum 10 by the action of step 9, is conveyed by a conveyor belt 20, and is sent to a fixing roller 21 as a fixing device provided at the end of the conveyor belt. It will be established. After fixing, the paper is discharged to a tray 25 outside the main body 1 by a pair of delivery rollers 22. After the transfer, the photosensitive drum 10 is returned to its initial state by removing residual toner on the surface with a cleaner 26 and erasing any afterimages with a static elimination lamp 27. Note that 29 is a cooling fan for preventing the temperature inside the main body 1 from rising.

Further, the exposure lamp 4 and the mirror 5 are connected to the first carriage 4.
11, and the mirror 6.7 is mounted on the second carriage 412.
It is set in.

On the other hand, the first carriage 41. A spot light source 131 is provided that is movable in a direction perpendicular to the direction of movement. This spot light source 131
is provided with a light emitting element that irradiates a spotlight onto the document table 2, and it is possible to specify, for example, an erasing range of the document using this spotlight.

Further, an erasing array 150 is provided between the charger 11 for charging the photosensitive drum 10 and the exposure section ph. In the erasing array 150, a plurality of light emitting elements (not shown) are arranged along the longitudinal direction of the photoreceptor drum 10. When erasing a part of a document, etc., these light emitting elements are connected to the spot light source 131. The light is turned on corresponding to the erasing area designated by , and the electric charge accumulated on the photosensitive drum 10 is removed. Therefore, an electrostatic latent image is not formed in the portion from which the charge has been removed even if it is subsequently exposed to light at the exposure portion ph, so that the document image is erased.

Further, a writing unit 71 is provided between the exposure section ph and the developing device 12. This writing unit 7
1 is for copying the original image and writing necessary characters, etc. on the paper on which the original image is to be formed. Details of this writing unit 71 will be described later.

FIG. 21 shows an operation panel 30 provided on the copying machine main body 1.
This shows that. 30a is a copy key for commanding the start of copying; 30b is a numeric keypad for setting the number of copies, etc.; 30
30d is a density setting section for setting the copy density; 30e is a count command key for displaying the total number of copies and the number of copies for each color; 30f 30g is the interrupt key that is operated when something else is copying while copying, and the 30g is the same-size key that is operated when setting the copy magnification to 100%.
30h is the magnification key operated when setting the copy magnification,
30i is a cassette selection key that is operated to select the upper and lower cassettes 1B+ and 132, and 30 is a cassette selection key that is operated when selecting the upper and lower cassettes 1B+ and 132. For example, when an edit key 30n, which will be described later, is operated to specify the erasure range of the original, this specified erasure range, etc. The mode memory key is operated to store information in the memory or to read out information such as the erasing range previously stored in the memory, and 3ON is the information key operated when you want to obtain information according to each mode. When this key is operated when a jam occurs, information for clearing the jam is displayed on a display 30o, which will be described later. 30
m is a function key, and by operating this function key 30m, it is possible to display what function is set on the display 30o. 30n
is an editing key that is operated when performing partial deletion, etc., in which a part of the original image is deleted and copied. 30o is a display device made of, for example, a liquid crystal dot matrix panel;
When 0n is operated, a corresponding display is displayed. On both sides of the display 300, operation keys 30□ to 30-1 and 305 to 308 are arranged to select various functions displayed on the display 30o. Further, 30p is a movement key for moving the above-mentioned spot light source 131, and this movement key 30p corresponds to the arrow 30.
As shown in q~30t, it is possible to tilt in all directions,
When these arrows 30q to 30t are operated, the spot light source 131 is moved in the same direction.

30u is a position designation key for inputting the coordinate position indicated by the spotlight ri, 131.

Next, the document image erasing means will be explained.

In FIG. 22, the first carriage 411 includes a lamp 4.
A guide shaft 130 is inserted along the lamp 4 in the part where the light is blocked.
A spot light source 131 is movably provided on the guide shaft 130 as a means for indicating the erasing range of the document. The spot light source 131 includes a light emitting element, such as a light emitting diode or a lamp, provided opposite the document table 2, and a lens that irradiates light generated from the light emitting device onto the document table 2 as a spot light. ing. This spot light has a brightness that allows it to pass through a document set on the document table 2, which is, 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 guide shaft 130. 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 spot light source 131 is moved in a direction perpendicular to the scanning direction of the first carriage 41 (in the direction of arrow X in the figure).

Further, a first carriage 411 located at the end of the guide shaft 130 on the pulse motor 135 side includes a spot light source 131.
A position sensor 138 consisting of a microswitch is provided to detect the initial position of the spot light source 131 . Furthermore, the first carriage 411 is driven by a motor 43 in the direction of arrow y in the figure.

FIG. 4 shows the writing unit 71.

This writing unit 71 is movably provided on guide shafts 72 and 73 disposed along the longitudinal direction of the photosensitive drum 10. Boots 974, 75 are provided near both ends of this guide shaft 72, 73, and a timing belt 76 to which the writing unit 71 is fixed is stretched across these pulleys 74, 75. The pulley 75 is driven by a motor 77, and by driving the motor 77, the writing unit 71 is moved along the photosensitive drum 10 via the timing belt 76. .

FIG. 5 shows the configuration of the writing unit 71. Inside this writing unit 71, a printed wiring board 7 is provided.
1a is provided, and this printed wiring board 71a has a board 7
11 are provided. A light emitting diode array (hereinafter referred to as LED array) 71b is provided on the substrate 711, facing the photosensitive drum 10, as shown in FIG.

This LED array 71b is composed of a plurality of LEDs 71C arranged along the longitudinal direction of the photoreceptor drum 10, and the total length A of this LED array 71b is 1/2 of the maximum copy width of the photoreceptor drum 1o. has been made shorter than. This LED array 71b is connected to a flat cable 71 connected to the printed wiring board 71a, as shown in FIG.
d, and are selectively turned on in response to signals corresponding to characters, etc. supplied from an LED driving section, which will be described later. Furthermore, inside the writing unit 71,
The light generated from the LED array 71b is transferred to the photosensitive drum 1.
A light focusing lens 71e is provided to guide the light to the surface of the light beam.

Furthermore, a shutter 71f is provided on the side surface of the writing unit 71, corresponding to the LED array 71b, for blocking a part of the incident light Bi that exposes the photosensitive drum 10. When writing characters, etc. using the LED array 71b, the shutter 71f is arranged so that the electric charge on the portion of the photosensitive drum 10 where the characters, etc. are written is not erased by the incident light Bi. It blocks light.

FIG. 7 shows the structure of the shutter 71f. A shaft 71g is provided at the base end of the shutter 71f, and this shaft 71g is rotatably provided on the side surface of the writing unit 71. A pinion 71h is provided at one end of the shaft 71g.
is engaged with. This rack 71i is connected to a plunger 71k of a solenoid plunger 71j provided inside the writing mini-knit 71. The solenoid 71 of the solenoid plunger 71j is normally deenergized, and in this state, the plunger 71k is projected from the solenoid 711 by a spring (not shown).

Therefore, the shutter 71f is rotated so as to come into contact with the side surface of the writing unit 71, as shown by solid lines in FIGS. 5, 7, and 8, and the incident light Bi is taken out. Further, when the solenoid 71N is energized, the plunger 71
k is sucked into the solenoid 71g. Therefore, as shown by the broken line in the same figure, the shutter 71f
i, and a part of the incident light Bi is blocked.

Next, the photosensitive drum 1 is turned on by the LED array 71b.
The relationship between the image formed on 0 and the incident light Bi blocked by the shutter 71f will be further explained.

As shown in FIGS. 1 and 2, the total length A of the LED array 71b is δ in the direction of both ends from the width B of the shutter 71f.
It has only been longer.

If the width B of the shutter 71f is made equal to or shorter than the total length A of the LED array 71b, the width of the shutter 71f
The incident light Bi is blocked by the photoreceptor drum 10, and the width of the charge remaining on the photoreceptor drum 10 becomes longer than the total length A of the LED array 71b, and the LED array 71b cannot erase all of this charge. Portions corresponding to both ends of the array 71b remain as black lines.

However, as mentioned above, the total length A of the LED array 71b is
By making the width B of the shutter 71f longer by δ in each end direction, it is possible to prevent charges from remaining unerased.

That is, as shown in FIG. 2, the LEDs of the LED array 71b
71c, the part corresponding to the character is turned off, and the part other than the character is turned on. The width C of the character is narrower than the width B of the shutter 71f. Therefore, within the width C of the character, the charge of the photosensitive drum 10 remains in the portion where the LED 71C is turned off, and when developed, as shown in FIG.
Characters are visualized. In addition, since the LEDs 71c corresponding to both ends of the character width C are all lit, the charges in the corresponding parts are erased, and unnecessary black lines are not generated in the parts corresponding to both ends of the shutter 71f. It is.

On the other hand, the shutter 71f is provided closer to the LED array 71b in the rotational direction of the photoreceptor drum 10. Therefore, the opening/closing timing of the shutter 71f and the LE
Depending on the lighting timing of the D array 71b, the image corresponding to the tip of the shutter 71f may remain. Therefore, the rotation timing of the shutter 71f,
The lighting timing of the LED array 71b is set as follows.

In FIG. 9, when writing characters or the like in a copy image, the LED array 71b is turned on Δt1 hour before the shutter 71f is rotated. After this, the shutter 71f is rotated, and the shutter 71f is inserted into the incident light Bi.

Here, tl is the time required until the shutter 71f is completely opened. In this state, when characters, etc. are written and the writing of characters, etc. is finished, first, the shutter 7 is
1f is closed (t2 time), and after the shutter 71f is closed, the LED array 71b is turned off after Δt2 time has elapsed.

By controlling the lighting of the LED 7 lb at such timing, it is possible to prevent the image corresponding to the tip of the shutter 71f from remaining unerased.

FIG. 10 shows the configuration of the main parts of the control system. The control section 81 controls the entire copying machine, and the operation panel 30 is connected to this control section 81. The control section 81 is connected to the control section 81, and is made up of a plurality of dots corresponding to the characters specified by the operation of the operation panel 30. A character generator 82 that generates a character pattern, a barcode generator 83 that similarly generates a barcode composed of a plurality of dots, and a control section 8
1, a memory 84 in which the operation program of 1, etc. is stored; a motor drive circuit 85 that drives and controls the drive motor 135 of the spot light source 131; the drive motor 43 of the first carriage 411; and the drive motor 77 of the writing unit 71; A solenoid drive circuit 86 that drives and controls the drive solenoid 71f1 of the shutter 71f, and the LED array 71.
An LED drive circuit 87 is connected to control the lighting of LED b in response to character signals supplied from the character generator 82 and barcode generator 83.

The operation of the above configuration will be explained with reference to FIG. 11.

In the normal standby state, the display 300 of the operation panel 30 shows the selected copy magnification "100%" and the selected paper size rA4, as shown in FIG. 12(a).
J, and the character writing mode selection display "Character writing" are displayed (Step 5TI). In this state, the other keys 30g to 30i, 30 on the operation panel 30
When ~30n is operated, the display state of the display 30o is changed according to the operated key, and a desired mode can be set (step ST2.3). Also,
In this display state, if you operate the copy key 308,
A copying operation is performed according to the set copying magnification and paper size (step ST4.5).

On the other hand, when the operation key 304 corresponding to "character writing" is operated, the character writing mode is set (step 5T).
6). In this character writing mode, the display 300
The display state of is switched from the state shown in FIG. 12(a) to the state shown in FIG. 12(b) (step 5T7). This display 30
o corresponds to the operation keys 301 to 304, respectively,
"Date" that allows you to write the date along with the copied image
, "Character" on which you can write the required characters, "Barcode" on which you can write the required barcode, "Telephone number" on which you can write the required telephone number, for example, in the form of a barcode. is displayed, and operation key 3 is pressed.
"Cancel" is displayed corresponding to 08. In this display state, when the corresponding operation keys 301 to 305 are operated, the display state of the display 300 is switched to the display state corresponding to the selected mode. Further, when the operation key 308 corresponding to "Cancel" is operated, the display state shown in FIG. 12(a) is restored. In any of the display states shown below, if the operation key 308 corresponding to "Cancel" is operated, the display returns to the one shown in FIG. 12(a).

First, a case will be described in which the operation key 301 corresponding to "date" is operated in the display state shown in FIG. 12(b).

When the operation key 301 is operated, the display state of the display 300 is switched to the state shown in FIG.
T8-9). In this display state, when a date is input from the numeric keypad 30b of the operation panel 30, the input date information is displayed on the display 300 as shown by the broken line in the figure, and this date information is stored in the memory 84. When the operation key 304 corresponding to "confirm" is operated in a state in which date information has been input, the writing position is manually displayed (step 5T10.11.12).

FIG. 12(d) shows the input display of the writing position. To input the writing position, move the spot light source 131 by operating the movement key 30p on the operation panel 30, and specify the writing start position using the spot light source 131.

For example, as shown in FIG. 13, when the movement key 30p is operated with the document OG set face up on the document table 2, the motor drive circuit 85 causes the motor 135.
3 is driven, and the spot light source 131 is moved while being turned on. Then, when the spot light source 131 reaches the required writing start position (XI, YI), if the operation key 304 corresponding to "confirm" or the position designation key 30u is operated (step 5T13
．． 14), the position is set as the writing start position in the memory 84.
Thereafter, the motor 77 is driven by the motor drive circuit 85, and the writing unit 71 is moved to the position xl as shown in the figure (step 5T15).

With the writing start position specified in this way, when the original is turned over and the copy key 30a is operated (step 5T16), the copying operation is started (step 5T1).
7). In this copying operation, when the exposure scanning position of the original approaches the specified writing start position (yl), the LE
All LEDs of the LED array 71b are driven by the D drive circuit 87.
is lit (step 5T18), and in this state Δ1. After a period of time has elapsed, the solenoid 71N is energized by the solenoid drive circuit 86, and the shutter 71f is activated by the incident light Bi.
is rotated inward (step 5T19). Then, when time t1 has elapsed, the LED array 71b is selectively turned on according to the written information (step 5T20).

That is, in the character generator 82, character patterns corresponding to the date information are sequentially generated, and among the generated character patterns, - column position information is sequentially supplied to the LED array 71b via the LED drive circuit 87. . Then, by turning off the LED 71c in the portion corresponding to the character pattern, charges corresponding to the character pattern remain on the photoreceptor drum 10.

In this way, when writing of date information by the LED array 71b is completed, the solenoid 711 is deenergized by the solenoid drive circuit 86, and the shutter 71f is taken out from the optical path of the incident light Bi (step 5T21). After the shutter 71f is completely removed from the optical path, Δt2
When the time has elapsed, the LED array 71b is turned off by the LED drive circuit 87 (step 5T22).

The date information formed on the photosensitive drum 10 along with the copying of the original image is then developed by the developing device 12, transferred and fixed onto the paper, and is ejected to the paper ejection tray 25 of the copying machine main body 1. When the copying operation is completed, the display on the display 30o of the operation panel 30 returns to the state shown in FIG. 12(a) (steps 5723 to 5TI).
).

FIG. 14 shows an image copied as described above, in which an original image is formed on paper P and date information is written at a designated position.

Next, the case of writing required character information will be explained.

In the display state shown in FIG. 12(b), when the operation key 302 corresponding to "character" is operated, the display state changes to the state shown in FIG.
e) (steps 5T24-2)
5). That is, the display 300 includes, for example, an alphabet and a cursor 309 that indicates this alphabet.
is displayed, along with "Confirm j" and "Cancel" are displayed. The cursor 309 is, for example, the movement key 3.
It is moved by operating 0p, and when the cursor 309 is moved below a desired alphabet and the position designation key 30u is operated, the designated alphabet is displayed as shown by a broken line. In this way, with the required alphabet manually created,
When the operation key 304 corresponding to "Confirm" is operated, the display state of the display 30o is switched to the writing position input display shown in FIG. In this display state, after specifying the writing position as described above (step 5T
12-15), when the copy key 30a is operated (step 5T16), manual operation of the specified character is performed in conjunction with the copying operation as described above (steps 5T17-23).
).

On the other hand, when the operation key 303 corresponding to "barcode" is operated in the display state shown in FIG. 12(b), the display state is switched as shown in FIG. 12(f) (steps 5728-29). That is, the display 30o displays an instruction to input required code information from, for example, a numeric keypad, and also displays "Confirm" and "Cancel".

In such a display state, when required code information corresponding to the number of copies, paper size, etc. is entered from the numeric keypad 30b, the code information is displayed on the display 30o as shown by a broken line. ” (Step 5T3)
0, 31), the display state of the display 30o is switched to the writing position input display shown in FIG. 3(d). In this display state, after specifying the writing position as described above (steps 5T12 to 15), when the copy key 30a is operated (step 5T16), the specified code information is A corresponding barcode writing operation is performed (steps 5T17-23)
.

That is, in this case, the input code information is converted into corresponding barcode information by the barcode generator 83, and this barcode information is supplied to the LED array 71b via the 1LED drive circuit 87. LED array 71b
The lighting is controlled according to this barcode information as shown in FIG. 15, and this barcode information is written in the document image.

FIG. 16 shows the barcode BC written on the paper P together with the original image.

Next, a case will be described in which, for example, a telephone number is written on a business card using a barcode. In this case as well, it is almost the same as writing the barcode.

That is, in the display state shown in FIG. 12(b), when the operation key 304 corresponding to "telephone number" is operated, the display state is switched as shown in FIG. 12(g) (step 5).
T32-33). The display 30o displays an instruction to input a required telephone number from, for example, a numeric keypad, as well as "confirm" and "cancel". In such a display state, when a desired telephone number is manually entered from the numeric keypad 30b, that telephone number is displayed on the display 300 as shown by a broken line, and in this display state, the operation key 304. When you operate (step 5T3
4.35) The display state of the display 30o is switched to the writing position input display shown in FIG. 4(d). In this display state, after specifying the writing position as described above (steps 5T12 to 15), when the copy key 30a is operated (step 5T16), the paper feed cassette 131. A barcode writing operation is performed on the business card set in any one of the business cards 132 (steps 5717 to 23). That is, in this case,
The input telephone number is converted into corresponding barcode information by barcode generator 83, and this barcode information is supplied to LED array 71b via LED drive circuit 87. The LED array 71b is controlled to light up according to this barcode information, and this barcode information is written into the business card.

Figure 17 shows the barcode BC written in the business card PC.
This shows that.

Although the barcode writing position is designated by the spot light source 131, it is not limited to this, and may be set in advance. - Next, the case of erasing a part of the original image will be explained.

That is, in the display state shown in FIG. 12(b), when the operation key 305 corresponding to "erase" is operated, the display state is switched as shown in FIG. 12(h) (step 5T3).
6 to 37), the display 30o displays a message indicating that the erasing start position is designated by the spot light source. In this display state, the spot light source 131
When the writing unit 71 is moved to the desired position and the position designation key 30u or the operation key 304 corresponding to "confirm" is operated at this position (step 5T13.14), the writing unit 71 is moved to the designated position. (Step 5T15). In this state, when the copy key 30a is operated (step 5T16), all the LEDs 71c of the LED array 71b are turned on from the specified erasure start position, and the charge on the photoreceptor drum 10 ( (original image) will be deleted. Then, when the copying operation is completed, the LED array 71b is turned off.

FIG. 18 shows a document image formed on a sheet of paper P, in which a portion of the image ER specified by the spot light source 131 is erased according to the width A of the LED array 71b.

According to the above embodiment, the writing unit 71 having a width smaller than 1/2 of the maximum copying width of the photoreceptor drum 10 is provided near the photoreceptor drum 10.
This allows information such as required characters to be written together with the original image.

Therefore, since information such as characters can be written using a normal copying machine, manufacturing costs can be lowered compared to digital copying machines.

Moreover, since required characters and the like can be written in the original image with - number of copying operations, the copying speed is fast.

Further, a shutter 71 is provided on the side surface of the writing unit 71.
A shutter 71f is rotatably provided, and this shutter 71f is inserted into the incident light Bi to block a part of the incident light Bi, and information such as characters is written on this blocked part by the LED array 71b. . Therefore, it is possible to reliably write information such as characters.

Furthermore, the irradiation range A in the longitudinal direction of the photoreceptor drum 10 of the LED array 71b is set to be wider than the width B in the longitudinal direction of the photoreceptor drum 10 of the shutter 71f. Therefore, it is possible to prevent the images corresponding to both longitudinal ends of the photoreceptor drum 10 of the shutter 71f from remaining unerased.

Further, the width B of the shutter 71f in the longitudinal direction of the photosensitive drum 10 is set wider than the width C of characters, etc. formed by the LED array 71b.

Therefore, information such as characters to be written will not be missing, and writing can be performed reliably.

Furthermore, when writing information such as characters, the LED array 71b is turned on prior to the opening operation of the shutter 71b, and the LED array 71b is turned off after the opening operation. Therefore, it is possible to prevent the image corresponding to the tip of the shutter 71b from remaining unerased.

Furthermore, the shaft 71g of the shutter 71f is
It is driven by a pinion 71h provided in the writing unit 71 and a rack 71i provided in the writing unit 71 and driven by a solenoid plunger 7147. therefore,
It is possible to downsize the configuration, the shutter 71f can be disposed close to the surface of the photoreceptor drum 10, and when the shutter 71f blocks the incident light Bi,
It is possible to suppress the influence of diffraction of the incident light Bi and sharply block the incident light Bi.

Further, the writing unit 71 is movable along the longitudinal direction of the photosensitive drum 10. Therefore, it is possible to write information such as characters at any position on the document image.

Further, the movement position of the writing unit 71 can be specified on the document set on the document table 2 using the spot light source 131. therefore,
The writing position can be specified easily and reliably.

The control unit is also provided with a barcode generator 83, which converts this code information into a barcode when required code information is input, and writes the barcode in the document image along with the copying operation of the document image. It is now possible to enter. Therefore, for example, when copying a document, if information such as the number of copies, paper size, copy magnification, etc. of the document is recorded using a barcode, it can be used for document management.

Furthermore, when the telephone number write mode is set, the input telephone number can be written in a desired document image such as a business card using a bar code. Therefore, it is possible to automatically dial a business card on which a barcode corresponding to a telephone number is formed, for example, by having a barcode reader and using the telephone number read by the barcode reader. It can be applied to telephones.

Further, when the erasing position is specified using the spot light source 131 while the erasing mode is set, a part of the original image can be erased using the writing unit 71 while forming the original image. Therefore, in the case of slight erasure of the original image, the original can be erased without using the erasure array 150.

Furthermore, since the writing unit 71 can be manufactured at a lower manufacturing cost than the erasing array 150, it is advantageous to provide it in place of the erasing array in, for example, a low-cost copying machine.

Note that this invention is not limited to the above embodiments,
Of course, various modifications can be made without departing from the gist of the invention.

[Effects of the Invention] As detailed above, according to the present invention, an erasing means having a width equal to or less than the maximum image forming range of the image carrier is provided, and the erasing means is moved in the longitudinal direction of the image carrier by the moving means. It is possible to provide an image forming apparatus that is capable of erasing a desired portion of a document image with a simple configuration by moving the image forming apparatus along the image forming apparatus to a desired position, and that can reduce manufacturing costs.

[Brief explanation of the drawing]

FIGS. 1 to 3 each show an embodiment of the present invention, and FIGS. 1 and 2 are schematic views of the main parts showing the relationship between the shutter and the LED array, and FIG. 3 is a perspective view of the main parts. Figure 4 is a perspective view of the main parts of the writing unit, Figure 5 is a side view of the main parts of the writing unit, Figure 6 is a plan view showing the configuration of the LED array, and Figures 7 and 8. 7 shows the structure of the shutter, and FIG. 7 is a perspective view of the main part, and FIG.
The figure is a side view of the main parts, Figure 9 is a diagram shown to explain the relationship between the rotation timing of the shutter and the lighting timing of the LED array, Figure 10 is a configuration diagram showing the control system, and Figures 11 to 18 19 and 20 respectively show the configuration of an image forming apparatus to which the present invention is applied, FIG. 19 is an external perspective view, and FIG. 20 is a diagram for explaining the operation. 21 is a plan view showing the structure of the operation panel, and FIG. 22 is a perspective view showing the structure of the spot light source. 1... Copying machine main body, 10... Photosensitive drum, 12.
...Developer, 30...Operation panel, 71...Writing unit, 71b...LED array, 71f...
71h...Pinion, 71i...Rack, 71j...Solenoid plunger, 81...Control unit, 82...Character generator, 83...Barcode generator, 131...・Spot light source, Bi...incident light. Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 2 Figure 3 Figure 5 Figure 6 Figure 7 Figure 71h Figure 8 Figure 10 (b) (c) (d)
(e) Fig. 11 8 Wing Tsubasa Lily Lily (II') ('Q ('10 0wa (Y)
-1wa ('Q('Q Figure 12 Figure 14 BC Figure 15 Figure 16 Figure 17 Figure 18

Claims (1)

[Scope of Claims] A scanning means for exposing and scanning a document; an image carrier on which an image of the document guided by the scanning means is formed; a developing means for developing the image formed on the image carrier; In an image forming apparatus comprising a transfer means for transferring a developed image to a transfer material, the width is less than or equal to the maximum image forming range of the image carrier, and the image carrier is irradiated with light to charge the image carrier. An image forming apparatus comprising: an erasing means for erasing an image; and a moving means for moving the erasing means in the longitudinal direction of an image carrier.