JPS6361270A - Copying machine - Google Patents

Abstract

PURPOSE:To easily prevent a copy image from being formed on half of a form without using an editing input, by eliminating an electrification of a designated area on a photosensitive body prior to a development of an electrostatic latent image, when a 1/2 erasion mode is inputted. CONSTITUTION:An inter-image erasing unit 4 is placed in the vicinity of a photosensitive drum 61. The unit 4 is provided with an LED array 40 on which many LEDs are arranged in one line, and by allowing an arbitrary LED to emit a light beam selectively, an electrification of the corresponding area on the drum 61, and it is prevented that an electrostatic latent image is formed in this area. For instance, in order to eliminate the electrification of one area 401 which is divided equally in the center in the feed paper direction, the LEDs extending from the center point C of the array 40 to one end A are turned on, and the LEDs extending from the center point C to the other end are turned off. Also, in order to eliminate an electrification of an area 402 which is divided equally in the center in the direction orthogonal to the feed paper direction, the LEDs are turned on extending from the end time of a time TE to the end time of a timer TC. In such a way, electrification in the area of the corresponding drum 61 is eliminated.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electrophotographic copying machine, and more specifically, an electrophotographic copying machine that does not form a copy image in a half area of a copy sheet that is specified from the outside with a single touch. It is.

The present invention is particularly convenient when copying one page out of two pages of a book spread as a manuscript.

[Prior Art] Conventionally, when copying a tree while viewing and listening to it, in order to avoid copying unnecessary pages, it is common to cover those pages with blank paper to prevent them from being copied. . Also, when copying a rough stone that is half the size of the paper,
In order to prevent stains on the document cover from transferring to the margins, it is necessary to place a blank sheet of paper or the like.

On the other hand, in the past, only a specific area of a document was copied onto paper.
A copying machine having a so-called editing screen has been proposed. By using such a copying machine with an editing function, by specifying half of the document as a specific fn area that is not desired to be copied, it is possible to obtain a copy with the unnecessary half area as a margin.

[Problem to be Solved by the Invention 1] However, in the above-mentioned copying machine with an editing function, an editing input means for specifying the specific area not desired to be copied (or a specific area desired to be copied), e.g. An editing input device such as a numeric keypad for inputting coordinate data (numerical data) representing the above area, or a block division diagram for inputting the previous i and a areas in blocks, is required. , it takes time and effort to specify.

The present invention has been made in view of the above circumstances, and it is possible to easily and quickly set a copy n so that a copy image is not formed on any half of a sheet of paper without using an editing input means. This is what we are trying to provide.

[Means for Solving the Problems] The present invention involves exposing and scanning a document to form an electrostatic wI image on a photoreceptor, developing the electrostatic latent image with toner, and transferring it onto copy paper. A copying machine that forms a copy image by specifying one area divided into two at the center of the copy paper in the feeding direction of the copy paper or in a direction perpendicular thereto.
2 erase mode input means; and a control unit that specifies an area on the photoreceptor corresponding to the specified area on the paper under the 1/2 erase mode and instructs removal of charge from the area; Based on a command from the control section, the apparatus always specifies that the apparatus includes a charge removing means for removing charge from a designated area on the photoreceptor prior to development of the electrostatic latent image.

Each component will be explained below.

(1) Copying machine to which the present invention is applied A document image formed by exposure scanning (q) is formed on a charged photoreceptor to form an electrostatic latent image, which is developed with toner and printed on a sheet of paper. A copying machine using the so-called electrophotographic process transfers images to
The present invention is applied.

(2>1/2 erase mode input means An input means for specifying one area obtained by dividing the copy paper at the center in the paper feeding direction or a direction perpendicular to this,
It consists of keys that can be input with one touch. still,
As for the area, one of the equally divided areas may be arbitrarily specified, or one area fixedly determined in advance may be specified.

(3) Control unit calculates the area on the photoreceptor corresponding to the area designated as the area where no copy image will be formed. If necessary, copy paper size data is added to the calculation data.

Here, the control section is configured by software using a digital computer and/or by a hard circuit.

(0) Charge removing means The charge removing means may include, for example, arranging a large number of light emitting elements such as LED elements in close proximity to the surface of the photoreceptor, and irradiating any part of the surface of the photoreceptor. may be configured.

Incidentally, in the present invention, the term "electrification removing means" includes a case where the designated area is not charged from the beginning.

[Example] The present invention will be described below with reference to specific examples shown in the drawings.

In the example below, two areas are divided into two areas divided in the paper feeding direction at the center of a copy m This is a case in which there are four 1/2 erase mode keys for specifying areas that are not to be formed.

Further, erasing of a designated area is realized by selectively turning on and off an LED lamp of an inter-image eraser disposed close to the photosensitive drum. In this embodiment, the paper is fed symmetrically with respect to the center in the axial direction of the photoreceptor drum. This is done by turning on or off the LED lamp on one side of the center in the axial direction, and turning off or on the LED lamp on the other side. Furthermore, to remove the charge in the areas divided in the direction perpendicular to the paper feeding direction, a timer having a set time corresponding to the paper size is used to control the LED lamps to turn on and off in accordance with the constant rotation of the photosensitive drum. To do this.

(Description of the copying machine body) First, the mechanical configuration and copying principle of the copying machine to which the present invention is applied will be explained.

FIG. 1 is a schematic diagram showing the structure of the copying machine main body of this embodiment.

As shown in the figure, the copying machine of this embodiment includes scanning means (51 to 55) for exposing and scanning a document and transmitting an image, and an image forming unit for reproducing the transmitted image on copy paper by an electrophotographic process. 6 (61 to 69), a paper feed/discharge system 7 (71 to 76) that supplies copy paper and fixes images, and a document table 8 made of glass.

(a) Scanning means The scanning means 5 is controlled by a second CPU, which will be described later, and has a light source (not shown), mirrors 51, 52, 53, 54, a lens 55, and a drive rib structure (not shown). It moves back and forth along the bottom surface of the document, and as it moves forward, it exposes and scans the surface of the document. That is, the reflected light from the raw stone is reflected by the mirrors 51, 52, 53.
After being reflected by the lens (variable magnification lens block) 55
, and is further reflected by the mirror 54 to the photoreceptor drum 6.
1, and an image is formed on the surface of the drum 61. Mirror 51.
52 and 53 are driven in conjunction with each other by the same exposure scanning motor M3. The moving speed of the photosensitive drum 61 is
With respect to the circumferential velocity V, the mirror 51 has a speed of V/N (N: copying magnification), and the mirrors 52 and 53 have a speed of V/2N in order to keep the optical path length constant. On the other hand, the mirror 54 and the lens 55 are driven in conjunction with each other by a magnification setting motor M4. Here, the lens 55 moves on the optical axis to change the copying magnification, and the mirror 54 moves and swings.
Correct the image point.

(b) Image forming unit The image forming unit 6 is configured to perform a
a photoreceptor drum 61 which is rotatably driven in the direction of the arrow;
A main eraser lamp 62, a sub charger 63, and a sub eraser lamp 6 are arranged around the drum 61.
4. It has a main charger 65, a developing device 66, a transfer charger 67, a copy sheet separation 1 charge t68, and a blade type cleaning device 69. Note that between the main charger 65 and the developing device 66, an inter-image eraser unit 4, which will be described later, is arranged close to the photosensitive drum 61.

A photoreceptor layer is formed on the surface of the drum 61, and the photoreceptor layer is sensitized and charged by passing through the eraser lamp 62.64 and the charging charge 1763.65, and the photoreceptor layer is sensitized by passing through the eraser lamp 62.64 and the charging charge 1763.65. It receives slit exposure to form an electrostatic latent image. Note that no electrostatic latent image is formed in the area where the charge is removed by the inter-image eraser unit 4 prior to the slit exposure.

Toner is attached to the formed electrostatic latent image in the developing device 66, and the attached toner is transferred to the transfer charger 6.
7, copy paper (timing low 57 of paper feed/discharge system 7)
(supplied via 3).

(C) Paper feeding and discharging system The paper feeding and discharging system 7 is controlled by the i-th CPU, which will be described later.
Upper paper cassette 71 and lower cassette 72, pair of delivery rollers 711 and 721 of each cassette, and pair of transport rollers 7
12.713, timing roller pair 73, conveyor belt 7
4, a fixing device 75, a pair of discharge rollers 76, etc., which are driven by a main motor M1.

(Operation panel explanation) Next, the keys and displays on the operation panel will be explained.

FIG. 2 is a plan view of the operation panel 9 of the copying machine.

As shown in the figure, the panel 9 includes a print key 90 for starting the copying operation, a copy paper selection key 92 for selecting the copy paper stored in the paper cassettes 71 and 72 by size, an up key 932 for changing the copy density, and a down key 931, a group of numeric keys (corresponding to the numbers 1.2, . . . 9, and O, respectively) for inputting the number of copies 94, a group of magnification setting keys 95 for calling a preset copy magnification, and a paper feed 1/2 erase A key 961 to specify a mode in which no image is formed in the latter half of the direction, 1/2 erase B key 962 to specify a mode in which no image is formed in the first half in the paper feeding direction, paper feeding 1/2 erase C key 963, which specifies a mode in which an image is not formed on the front side on the photoconductor of the copying machine in a direction perpendicular to the paper feed direction; A 1/2 erase D key 964 for specifying a mode in which no image is formed, and a display panel 900 for displaying the number of copies in segments are arranged.

In addition, in the figure, each small square indicates an LED that indicates that the key or display in its vicinity is in an operating state.
It's a lamp.

(Explanation of Inter-image Erase Unit) FIG. 3 is a perspective view of the inter-image erase unit 4 disposed close to the photoreceptor drum 61, and FIG. FIG. 2 is an explanatory diagram of erasing the charging in the /2 area.

As shown I! & between erase lace unit 4 many L
It has an LED array 40 in which ED light emitting elements are arranged in a row, and by selectively causing any LED element to emit light, the charge on the corresponding area on the photoreceptor drum 61 is removed,
This prevents the formation of electrostatic latent images in the area.

For example, as shown in FIG. 4 (part 1), in order to remove the charge from one area 401 equally divided at the center in the paper feeding direction, the LED 7 ray 40 corresponding to the center in the axial direction of the photoreceptor 61 is The LED lamp from the center point C to one end A is on, and the LED lamp from the center point C to the other end B is off.

In addition, as shown in FIG. 4 (Part 2), the area 1 or 40 in the latter half of the sheet feeding direction is divided into equal parts 31j at the center in the direction perpendicular to the sheet feeding direction.
In order to remove the charge of No. 2, the timer TC is turned on from the end time of the timer TE until the end time of the timer TC. It takes L
When the ED lamp is turned on, the drum 6 corresponding to the shaded area in the figure
The charge in the area of 1 is removed and no electrostatic latent image is formed in that area, so no 1-image is transferred.

(Explanation of control part) FIG. 5 is an explanatory diagram of the groove formation of the Luli part before copying.

As shown in the figure, the $1 group includes the first CPU21, the second CPt
J22 and RAM23, and in this example, the driver 400 of the inter-floor erase unit 4 is a first CPU.
21. In addition, the first CPU 21 and the second
It is connected to the CPU 22 via a pass line 214. Although omitted in Fig. 5, there is an auto document feeder (ADF) for automatically feeding documents.
Alternatively, when two-sided units used for two-sided copying or the like are connected, the third CPU and the fourth CPU can be expanded and used.

The first CPU 21 is connected to input expansion ICs 202 to 205 controlled via a decoder 206, and is further connected to the keys 1Y90 to 964 of the display panel 9 and the paper feed/discharge system 7 via the input expansion ICs 202 to 205. +S connected to the sensor group.

Also, the output expansion fc2 controlled via the decoder 211
07 to 209, main motor M1, developing motor M
2. Clutch of timing roller 73, delivery roller 71
1, the clutch of the feed roller 721, the charging charger 65, the transfer charger 67, and other drivers.

Furthermore, it is also connected to an LED matrix 210 for displaying ON on the operation panel 9 via a decoder 212 .

The first CPU 21 drives the inter-image erase unit 4, the image forming section 6, and the paper feed/delivery system 7, displays numerical values on the display panel 900, and controls other temperature controls of the copying machine according to the key manual input or sensor input. The main operation of &1 lII.

The second CPU 22 uses a switch M installed in the scanning means 5.
sW50-8W52, a driver 500 for the exposure scanning motor M3, and a driver 501 for the magnification setting motor M4.

The second CPU 22 drives the exposure scanning motor M3 and the double/$ setting motor M4 in response to a command from the first CPLJ21, and also in response to a sensor input from an image tip switch installed in the scanning means. , generates a predetermined signal such as a timing signal.

The RAM 23 is used to write various data such as copying operation control data and magnification setting data (data is given from input from each operation key and a sensor that detects the operating state of each!4 device, and from the CPLI's ROM); and used for reading.

[Explanation by vJ] The operation of the apparatus of this embodiment will be explained below.

[A] [Schematic Description FIG. 6 is a flowchart showing the main routine of the first CPU 21. Note that the main routine of the second CPtJ (the flowchart showing l!1011 of the scanning means 5) is well known, so a description thereof will be omitted.

As shown in the figure, the first CPU 21 starts processing when the power is turned on, and first sets the initial state (S102).
, and then sets a routine timer that defines the time for one routine (8104).

Next, it is determined whether or not the copying machine is in the process of copying (81).
06) To be done.

Next, it is determined whether the 1/2 erase mode has been designated, and processing according to the designation is performed (5108), and then temperature adjustment, sensor input, or exposure scanning processing via the second CPU 22 is performed (S110). .

After the above processing, the routine timer set in 5104 ends and the process returns to 5104 (8112).

FIG. 7 is a flowchart showing the details of 8106 (copy operation).

Upon detection of the input of the print key 90 (S702), the copy operation process is started.

First, the copy start flag is set to 1'' (8704), and the flag is determined in 8706.Subsequently, the main motor M1, the developing motor M2, the charger 63.
65 and transfer charge cell 7 are respectively turned on, and timers TA and TB are set. Additionally, the copy start flag is lowered. In addition, the LED lamps of the inter-image eraser unit 4 are turned on completely (static eliminator code = 11) to prevent toner from getting on the surface of the photoreceptor in the area corresponding to the leading edge of the paper. <8708
). Here, the timer T△ defines 9.11 when the clutch of the paper feed roller 711, 721 is turned off, and on the other hand, the timer TB
defines the scan start time. In addition, the static eliminator code is 1
1 turns on the LED lamp of the inter-image eraser unit 4 completely, 00 turns it off completely, 1o turns off the LED lamp from the center point C of the t-E D 7 ray 40 to one end A,
Turn on the LED lamp from the center point C to the other end B, and
1 turns on the LED lamps C to A, and C turns off the LED lamps up to 8.

In the next steps 8710-8716, the upper cassette 71
Or turn on the clutch of the paper feed roller 711 or 721 of the selected cassette among the lower cassettes 72,
Open the copy paper feed.

Subsequently, in S718, it is determined whether the timer TA has expired,
The clutches of the paper feed rollers 711 and 721 that have been turned on are turned off (S720) to stop feeding the cobby paper.

Next, at 8722, it is determined that the timer B has ended, and the second
Generates a scan start signal to be transferred to the CPU 22 (37
24), and the second CPU 22 receives the signal,
A predetermined exposure scanning process is started.

At 8726, it is determined whether or not the 1/2 erase B key 962 has been input (1/2 erase B flag = 1), and if it is not turned on, it is further determined whether the 1/2 erase C key has been input. to decide.

(When the 3728M/2 erase C flag is set, L and ED clamps are turned off from A to C and turned on from C to B, and the static eliminator code is set to 10.
). Also, in S732, it is determined whether the 1/2 erase D flag is set, and if it is set, the static eliminator code is set to 01 in order to turn on the LED lamps from A to C and turn off from C to B. 8734). In addition, 1/2 ile~
When the A flag is set (1/2 erase 8 flag - 1) or when no 1/2 erase flag is set, the static eliminator code is set to OO (S736
), 8738, the timing signal from the second CPU 22 is determined. , the timing signal is transmitted to the second CPU 22
The signal is emitted after a predetermined period of time has elapsed after the scanning means 5 controlled by starts exposure scanning and the fixed position switch 5W50 is turned off.

When the timing signal is detected, the timing roller 7
Clutch No. 3 is turned on, copy paper is fed between the photosensitive drum 61 and the transfer charge 1767, and transfer to the copy paper is started.

Also, timer TO and timer TE are set (S740
),.

Timer E is set to determine whether to completely turn on or turn off the LED lamp of the inter-image eraser unit 4 so as not to form a copied image in the first half or the second half in the paper feeding direction of the copy paper. It is determined by the relationship between the copy paper size and the paper conveyance speed. That is,
The setting value (sec) of the timer TE is the length of the copy paper in the conveyance direction (paper size) (mm) ÷ conveyance speed (mf).
fi/5ec)x1/2.

In addition, the timer TC determines the scanning end time and the timing roller 7.
3 and the time when the inter-image eraser unit 4 is completely turned on in order to avoid toner from being deposited on the portion of the photosensitive drum 61 corresponding to the edge of the copy paper (8752). .5754). Note that the timer TC is determined by the size of the copy paper selected in 5710-8716.

When the timer TE ends (8742), it is determined whether or not the 1/2 erase flag is set (5744). If the flag is set, static electricity is removed to completely turn on the LED lamp of the inter-image eraser. Device code 11
On the other hand, when the 1/2 erase Δ flag is not set, it is determined whether the 1/2 erase B flag is set 5748), and when the B flag is set, the image spacing is In order to completely turn off the LED lamp of the eraser unit 4, the static electricity removal '3A setting code is set to OO (3750).

Next, at 8756, the return signal from the second CPU 22 is determined. The return signal is generated when the scanning means 5 starts returning.

When return is started (S756) and multi-copy is completed (3758), the scanner (not shown) returns to the normal position and a normal position signal is issued from the 20th PIJ 22 (S762), the developing motor M2 and the transfer charger 6
7 is a charger 63 and an inter-image eraser unit 4;
All of the LED lamps are turned off, and the timer T
D is set (S764). Timer TD is a timer that defines the off time of main motor M1 (S76
6.8768).

Note that if the multi-copy is not completed at 8758, a copy start flag is set (S760) and the copy operation is executed again.

Next, at 8770, each of the above control signals is output to external tM.
It also controls the CPU and transfers Shinen to other CPUs.

In this way, the copy operation is performed.

FIG. 8 shows the 17/2 erase mode 71? 12 is a flowchart showing details of a fixed routine (8108). First, it is determined whether the 1/2 erase A key 961 has been input (5802), and when it has been input, it is determined by the 1/2 erase A flag whether or not the previous state was already on (S804). '. When the previous state is off, the 1/2 erase A flag is 0. In this case, the 1/2 erase A flag is set to 1 (
S810), and other 1/2 erase flags are set to 0 (S810). On the other hand, when the previous state is on, the 1/2 erase flag is set to 0, and the 1/2 erase A
Assume that one line of mode is not defined. When the 1/2 erase A key is not input, it is determined whether the 1/2 erase B key is input (5814), and the following processing is performed in the same way as in the case of the 1/2 erase A key (3816~
5822). Also, 1/2 erase C key (S824~5
832), 1/2 erase D key (3834-8842)
) is also the same.

(Reference to Other Embodiments) In the above embodiment, the copy paper is divided into four equal halves in the paper feeding direction or a direction perpendicular thereto, which designates one area.
Do not create a copy image using the erase mode key 4
Each area is specified.

However, a single 1/2 erase mode key may be configured to fixedly designate any one of the four Ni regions, or a dip switch provided inside the copying machine may be used to specify one of the four Ni regions. The area designated by the two 1/2 erase mode keys may be arbitrarily changed.

[Effects of the Invention] As described above, according to the present invention, it is possible to prevent a copy image from being formed on any half of a copy sheet without using an editing input means.

Moreover, the means for that purpose, for example, requires only key human power, and is extremely easy and quick, and requires no effort.

Therefore, according to the present invention, it is possible to easily prevent unnecessary pages from being copied, especially when copying two pages between pages of a book as a manuscript onto one copy sheet. be.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the structure of the copying machine main body of this embodiment. FIG. 2 is a plan view of the operation panel 9 of the copying machine. FIG. 3 is a perspective view of the inter-image erase unit 4 arranged close to the photoreceptor drum 61. Figure 4 (Part 1) (Part 2) shows the inter-image erase unit l.
-4 is an explanatory diagram of erasing the charge in a specific 1/2 area of copy paper. FIG. 5 is an explanatory diagram of the configuration of the copy 1i 17) IQ 111 section. FIG. 6 is a flowchart showing the main routine of the first CPU 21. Figure 7 (Part 1) (Part 2) (Part 3) is 8106
2 is a flowchart showing details of the process. Figure 8 shows a 1/2 erase mode specification routine 8108)
2 is a flowchart showing details of the process. 21...1st CPU 22...2nd CPU4
...Image erase unit

Claims (4)

[Claims] (1) A copying machine that scans a document with exposure to form an electrostatic latent image on a photoreceptor, develops the electrostatic latent image with toner, and transfers it onto copy paper to form a copy image. 1/2, which specifies one area divided into two at the center of the copy paper in the paper feeding direction of the copy paper or in a direction perpendicular thereto;
2 erase mode input means; and a control unit that specifies an area on the photoreceptor corresponding to the specified area on the paper under the 1/2 erase mode and instructs removal of charge from the area; A copying machine comprising: a charge removing means for removing charge from a designated area on the photoreceptor prior to development of the electrostatic latent image based on a command from the control section. (2) The copy paper is fed such that the center of the paper coincides with the axial center of the photoreceptor, and the 1/2 erase mode input means inputs the copy paper regardless of the size of the copy paper. 2. A copying machine according to claim 1, wherein a particular one of the equal divisions of the copy sheet at the center is always designated. (3) The copying machine has a detection means for detecting the size of copy paper to be fed, and the control unit transmits the detected paper size data to the 1/1
2. A copying machine according to claim 1, wherein the data is employed as data for calculating an area on a sheet of paper on a photoreceptor that corresponds to an area designated by the erase mode input means. (4) The 1/2 erase mode input means is composed of four 1/2 erase mode keys that respectively specify the paper feeding direction of the copy paper and four areas equally divided in the direction orthogonal to the paper feeding direction. A copying machine according to claim 1.