JPS61223729A - Copying machine - Google Patents

Abstract

PURPOSE:To improve the operability when a variable power copy is taken beyond a specific range by dividing and displaying input copy magnification as plural magnification values when the input copy magnification exceeds the specific range. CONSTITUTION:The 1st coordinate corresponding to an original size are inputted with a light pen or ten-keys 101-110 and then the 2nd coordinates corresponding to a desired copy size are inputted to calculate copy magnification by dividing the 2nd coordinates by the 1st coordinates. It is judged whether or not this calculated copy magnification is within the variable power range of a machine and the magnification is displayed when within the range. When the magnification is not within the range, on the other hand, the square root of the calculated magnification is calculated to check whether or not the original is copied completely by performing the copying operation separately twice and when so, the variable power rate with which a single- time copy is taken is specified as the copy magnification of the 1st copying operation and the value obtained by dividing said copy magnification by the calculated magnification is displayed as the magnification of the 2nd operation. Thus, when the magnification is not within the specific range, the magnification is displayed as plural magnification values, so the magnification of the 2nd or succeeding operation need not be calculated and the operability is improved.

Description

[Detailed description of the invention] 〔Technical field〕 The present invention relates to a copying apparatus having a stepless variable magnification function.

[Prior art]

Conventionally, when performing a variable size copy, the variable rate has been limited to within the allowable range of the device. Therefore, when it is desired to make a copy at a variable magnification that is outside the permissible range, the copying process is performed twice, such as making one copy and then making another copy using that copy as the original.

However, in order to determine the variable magnification of the second copy, it is cumbersome that it must be calculated from the desired variable magnification and the variable magnification of the first copy.

〔the purpose〕

The present invention has been made in view of the above points, and when the input copying magnification exceeds a predetermined range, it is divided into multiple magnification values and displayed, thereby improving the operability of variable-magnification copying outside the predetermined range. The purpose of the present invention is to provide a copying apparatus that achieves the following.

〔Example〕

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

Description of Main Body FIG. 1 is a sectional view showing an embodiment of a double-sided copying machine to which the present invention is applied, in which an RDF 9 (automatic document feeder) and a sorter 39 are attached. Also, instead of RDF9, pressure plate 9
In some configuration diagrams, the surface of the drum l is made of a seamless photoreceptor made of ASI, and is rotatably supported. When the power is turned on by the power switch 2, the fixing device 3 is heated, and when it reaches a predetermined temperature, the main motor 4 drives the drum 1, the conveying section A,
B, C and the fixing roller 5 start rotating in the direction of the arrow.

When the temperature reaches a predetermined fixing temperature, the main motor 4 stops after performing potential control processing (pretreatment) and determining whether or not there is toner in the developing device 6.7, which will be described later. This is a timing state in which it enters a standby state and waits for a copy start signal.

First, the copying mode that can be performed by the copying machine of the present invention will be briefly explained, and then the copying process will be sequentially explained. Copying modes include one-sided copying mode, in which an image is formed on one side of the transfer paper and then ejected, two-sided copying mode, in which images are formed on both sides of the transfer paper and then ejected, and multiplex, in which multiple images are combined on one side of the transfer paper and then ejected. It can operate in copy mode, and in double-sided copy mode and single-sided copy mode, the intermediate tray 8 is used for copying.

Furthermore, by having a plurality of developing devices 6.7, it is possible to copy onto transfer paper in a plurality of colors. In addition, by detecting the document size, AMS (automatic scaling) is possible.

It has an APS (automatic cassette selection) unit and is equipped with a zoom function, etc.

(Double-sided copy mode) First, the process of obtaining a double-sided copy from a double-sided original will be explained. After setting the original 10 on the RDF 9, enter the key to make double-sided copies from the double-sided original on the operation unit 11, which will be described later. Next, set the number of copies, and after specifying the black developer 6 among the developers, press the copy start key. Enter. RDF
The original 10 set at 9 is conveyed onto the original glass 12. In addition, in the main body, an illumination lamp 14 that is integrated with the first scanning mirror 13 is set at the base position 92, and performs potential control (described later) and input light of the COD for document detection (details will be described later). .

Next, the original lO is illuminated by an illumination lamp 14 that is integrated with the first scanning mirror 13, and the reflected light is scanned by the first scanning mirror 13 and the second scanning mirror 15. The first scanning mirror 13 and the second scanning mirror 15 are
: Projection lens 16. by moving with a speed ratio of l/2.
The document is scanned while the optical path length in front of the document detection lens 17 is always kept constant.

In this way, the above-mentioned reflected light image is formed on the detection element C0D18 through the original detection lens 17, and is also formed on the projection lens 16, the third mirror 19. It passes through the fourth mirror 20 and is imaged onto the drum.

On the other hand, the drum 1 is removed by a pre-exposure lamp 21 and then corona-charged (for example, charged by 10 times) by a primary charger 22. After that, an image irradiated by an illumination lamp 14 is slit-exposed and electrostatically charged. A latent image is formed. During the original size detection scan, the latent image is erased by the eraser lamp 23, and the AC component of the developer bias is set to 0.
A bias is applied to prevent toner from adhering to the document size detecting element C by FFLDC.
The reflected light on the front original glass 91 is inputted to the 0D18 as original information, but the structure is such that the reflected light in the area where there is no original is extremely low.
The D processing will be described later.
After the processing is completed, scanning is performed for copying, and after obtaining the electrostatic latent image as described above, it is visualized by the designated developer 6 or 7, and then transferred to the manual feed cassette 24 and the upper cassette 25.
, the transfer paper in the lower cassette 26 or the deck 27 is fed from a designated paper feed port by the paper feed rollers 50, 51, or 52, and is conveyed to the front of the registration rollers 28. A member 29 attached to an illumination lamp 14 (hereinafter referred to as a moving optical system) unit integrated with the first scanning mirror 13 is detected by a document edge position (image edge) detection sensor 30. time T,
Thereafter, the registration roller 28 is driven, and the transfer paper is sent toward the photosensitive drum l with accurate timing so that the leading edge of the latent image and the leading edge of the transfer paper coincide. After that, as the transfer paper passes between the transfer charger 31 and the drum 1,
The toner image on the drum l is transferred to a transfer paper, and after the transfer is completed, it is separated from the drum l by a one-separation charger 32. Thereafter, the surface of the photoreceptor drum 1 is cleaned by the cleaning device 33, and the potential unevenness is evened out by the pre-exposure lamp 21, so that it can be used repeatedly.

Further, the transfer paper separated from the photoreceptor drum l is led to the fixing device 3 by the transport unit (A), and after being fixed, the paper path path is switched and controlled so that it is transported to the duplex unit 35 by the flapper 34. , the transfer paper is transferred to the transport section (B
), (C), switch back, and are stored in the intermediate tray 8. When the exposure operation for the set number of sheets is completed, the original platen 1
Pass the RDF on the original 10' on 2 (D).

Switch back by (E>, (F)) and repeat the pulling process to re-set the original 10' on the document table 12 so that the back side is copied. After the setting is completed, the paper is fed from the intermediate tray 8 by the paper feed roller 37. The transferred paper is transferred to the conveyance path (G).
After a predetermined time Tl, the member 29 to which the moving optical system unit is attached is detected by the document edge position (image edge) detection sensor 30. drive,
The latent image is sent toward the photosensitive drum l with precise timing so that the leading edge of the latent image and the leading edge of the transfer paper coincide. after that,
When the transfer paper passes between the transfer charger 31 and the drum l, the toner image on the drum l is transferred, and after the transfer is completed, it is separated from the drum 1 by the separation charger 32. The surface of the photosensitive drum 1 is cleaned by the cleaning device 33, and unevenness in potential is evened out by the pre-exposure lamp 21, so that it can be used repeatedly.

Further, the transfer paper separated from the photosensitive drum 1 is guided to the fixing device 3 by the conveying unit (A) and fixed thereon, and then is discharged by the flapper 34 through the paper discharge roller 8 to the sorter 39. The copying operation is completed by performing this operation for the set number of copies. Further, the original 10' on the original table glass 12 is transferred to the original tray 4 via the paper path path CD).
0.

It is also possible to make double-sided copies from single-sided originals. In this case, the original 10 set in the RDF 9 is placed on the paper path path (H
) and set on the original glass 12, the exposure operation for the set number of sheets is performed, and the transfer paper is transferred to the intermediate tray 8 as described above.
will be stored in. When the exposure operation for the set number of sheets is completed, the original 10' is discharged onto the original tray 40 via the paper bus path CD). Further, in parallel with this original ejection operation, the next original is fed and set on the original glass 12. Then, an exposure operation is performed on this document, a copy is made on the other side of the transfer paper that has been copied on one side and is stored in the intermediate tray 8, and the document is discharged to the sorter 39. Further, when the exposure operation for the set number of sheets is completed, the originals are discharged onto the original tray 40 via the paper path path (D). This operation is repeated until the original has been circulated once.

(Multiple Copying Mode) Next, the basic process of multiple copying and the movement of the transfer material will be explained. After setting the original on the RDF9, specify the multiple copy mode using the keys in the operation panel ll described later, then set the number of copies, select the developer to be used from among the multiple developers, and specify the developer. After doing so, enter the copy start key. As a result, the original 10 set on the RDF 9 is conveyed to the exposure position on the original glass 12. Then, as in the double-sided copying mode, a toner image is formed on the photosensitive drum l, and this toner image is transferred onto the transfer paper. Then, the paper path path is switched and controlled so that the transfer paper separated from the photoreceptor drum l is led to the fixing device 3 by the transport unit (A) and fixed thereon, and then transported to the multiplexing (double-sided) unit by the flapper 34. Ru. This makes the transfer paper.

It passes through the transport section (B) and is stored in the intermediate tray 8 by the switch 41. Repeat this operation for the set number of copies to complete the copying operation.Next, copy the document 10' on the document table 12 to RD.
After ejecting the document to the document tray via path F (H), take out the next document from the RDF 9, set the document on the document table 12 as described above, and then copy it onto the same side of the transfer paper. , a photoreceptor that transports the transfer paper fed by the paper feed roller 37 from the intermediate tray 8 to the front of the registration roller 28 through the transport path (G), and performs a copying operation in the same manner as in the case of backside copying in the double-sided copying mode. drum l
The separated transfer paper is led to the fixing device 3 by the conveyance unit A and fixed thereon, and is then discharged by the flapper 34 through the paper discharge roller 38 to the sorter. This operation is repeated for a set number of copies to complete the copying operation.

Further, the original on the original glass 12 is discharged to the original tray 40 via the paper path path (H).

Next, the page snapshot mode will be explained.

After setting the original on the RDF 9, manually press the keys to perform quick copying using the operation section 11, which will be described later.

Next, set the number of copies. In this embodiment, the mode for specifying the developing device to be used and the color for one side and the second side for continuous printing are predetermined. mode. In the following explanation, the document size is A3, the magnification is 1x, APS (automatic cassette selection) is selected, and the developing units for the - side and the second side are predetermined (the first side is black, the second side is black, the second side is This section explains the operation of the red side) mode. - Set the original copy size to A4 size and the original A3
1/2) As described above, the document fed to the exposure position by the RDF 9 is scanned by the first scanning mirror and the illumination lamp 14, and as described above, after obtaining an electrostatic latent image, The paper size sensors 42, 43, and 44 attached to the upper and lower cassettes or decks select the paper feed port in which A4 size transfer paper is set, for example, the upper cassette 25. is A3 size, lower cassette 26 is A4 size,
When B4 size transfer paper is set in each deck 27, the paper is fed by a paper feed roller from the paper feed port of the lower cassette 26 in which A4 size paper is inserted.
The member that is transported to the front of the registration roller 28 and attached to the moving optical system unit is moved to the front of the image tip sensor 30.
After a predetermined time Tl has elapsed after the latent image is detected, the registration roller 28 is driven, and the latent image is sent in the direction of the photosensitive drum 1 with accurate timing, so that the leading edge of the latent image and the leading edge of the transfer paper are aligned.

Thereafter, as described above, the paper goes through a transfer process, a fixing process via a conveyance system, is discharged, and copying is completed, and then copying of the second side is started. The moving optical system automatically returns to the optical system reference position 15 (home position) when the first exposure scan is completed.
The copying of the second side starts from the reference position 15, and after the member 29 attached to the moving optical system unit 45 is detected by the image edge detection sensor 30, The eraser lamp is turned on for a predetermined time T2 (width of A4 size) to erase the latent image of the - side and the potential of unnecessary areas to obtain the latent image of the second side. is visualized by a predetermined red developing device (color developing device), and the paper is fed by a paper feed roller from the paper feed port of the lower cassette 26 into which the A4 size is pushed, and then the paper is fed to the registration roller 28.
Then, after a predetermined time T3, the registration roller 28 is driven, and the sheet is sent in the direction of the photosensitive drum 1 with accurate timing, so that the leading edge of the latent image and the leading edge of the transfer paper are aligned. . Thereafter, as described above, the image is discharged through a transfer process, a fixing process via a conveyance system, and copying is completed. Further, as mentioned above, combinations of double-sided copying and a plurality of developing units, combinations of double-sided copying and continuous copying mode, combinations of multiple copying and multiple developing units, combinations of multiple copying and quick copying mode, etc. will be described later. It is configured so that it can be specified using the operation panel. Another function is to vary the process speed (peripheral speed of the photosensitive drum 1) when the irradiation light to the photosensitive drum 1 is insufficient. When the function is selected, the process speed is automatically reduced.

In addition, as another function, an eraser lamp in which a large number of printing elements are finely divided is arranged after image exposure and before development so that any part of the latent image on the photosensitive drum 1 can be erased.
It is configured so that any latent image can be erased by controlling the light-emitting elements of the publishing section, and functions to combine the aforementioned multiple copies and the colors of multiple developing devices to synthesize images. It is.

In addition, in order to make the process speed variable as described above, this embodiment uses the DC motor MI4 as the drive source, which will be explained using FIG. 2, and the speed is controlled by PLL control. is input to the PLL 81 as a reference, a speed signal from an encoder 82 connected to the DC motor MI4 is fed back, and the output of the PLL 81 is driven through an amplifier 83 so that the reference signal and the feedback signal are synchronized. 8
4 drives the DC motor 4, and when changing the speed, it is controlled by input signals A and H to change the output frequency of the oscillator 80.
, B are connected to a speed command circuit (not shown).

Operation timing Figure 3 shows the timing chart of the entire machine, and Figures 4 to 8 are for pre-rotation and potential control.

A timing chart of CCD dimming, CCD m setting, scanning, and post-rotation is shown. In FIG. 3, after the power is turned on, the fixing heater is turned on, the scanner is returned to the home position, and the lens performs initialization movement.
Pre-rotation potential control is performed after the fixing temperature reaches 185°C.

After the CCD dimming and post-rotation are performed and the fixing temperature reaches 196°C, the standby state is entered and copy key reception becomes possible. After the copy key is turned on and the pre-rotation potential is controlled, the lens moves to a position where it does not collide with the second mirror during a full scan in preparation for a COD measurement scan. Next, CCD light control and CCD measurement are performed to detect the size and original density. Thereafter, the lens is moved according to the magnification or specified magnification by AMS calculation. After scanning the set number of sheets and reversing the last one, it will start the post-rotation.

Figure 4 is a timing chart for pre-rotation, in which pre-exposure, blank exposure, and post-exposure are ONL in synchronization with the main motor, and from pre-exposure to sequentially turn on primary, post, and transfer 9-separation charging. The drum rotates to the forward rotation end.

During a copy operation, the specified developer is driven in synchronization with the main motor, and when it passes the potential sensor position from pre-exposure, the developing bias is set to the sensor output potential +2.
Enters 00V control. At this time, the other developing device is in a floating state.

FIG. 5 is a timing chart of potential control. At the start of potential control, the blank is turned off to form a dark potential on the drum. The drum potential is measured by a potential sensor, and the primary charging current is varied so as to approach the dark potential target potential of 450V. This is called vD sub-control, and the amount of light from the illumination lamp is controlled using the 0-order, which is performed four times, and the primary current obtained by Vo. Turn on the lamp to create a bright potential on the drum. The drum potential is measured by a potential sensor, and the bright potential approaches the target potential of 50V.
Controls the light intensity of the lighting lamp. This is called VL 1 control.

Do this three times. With the amount of light obtained at VL 1, the bright potential is measured again and this potential is called VL2, which is used to determine the development bias DC.

After the VL2 measurement is completed, potential control is completed.

FIG. 6 shows the timing charts for C0DiA light and CCDMd constant. In CCD dimming, the illumination lamp is controlled to have a light intensity suitable for COD measurement. The scanner is located at the home position, exposes a standard white plate, measures the amount of reflected light by COD, and controls the amount of light so that the maximum value on the line is at a predetermined level.
After this control is completed, the optical system performs a full scan and
Detects the size and a degree position of the original. At this time, when it is detected that there is no document, the threshold level and lamp light intensity are changed and scanning is performed again.

FIG. 7 is a timing chart of copy scanning. The optical system starts moving forward, and from the position where the image tip is detected, the developing bias DC becomes VL 2+70v, and the developing bias AC is also turned on. Furthermore, desired blank lighting control is performed from a predetermined timing starting from one stroke ahead.

FIG. 8 is a timing chart of post-rotation. After the final reversal of the scan, the rotation starts, and sequentially from the primary charging, the developing device, developing bias DC, developing/< Ias A C,
OFF, sensor +200v, 0FFL, post charging, transfer charging 9 separation charging are turned OFF. After one rotation of the drum from the primary charging OFF, the developing bias DC becomes Ov.

The main motor after the last paper has been ejected.

Blank exposure, post-exposure, and pre-exposure are turned off and the system enters standby mode.

Operation system FIG. 9-1 is a perspective view of a copying apparatus according to the present invention,
Reference numeral 251 is a document placing glass, and a touch panel using transparent electrodes is provided on the glass surface.
By pressing the pressing ben on the document placement glass 251, the coordinates of the specified position can be detected.

Note that the principle of the touch panel will be omitted here. Of course, even when exposing a document to form an image, since a transparent electrode is used, it does not affect the latent image formed on the photoreceptor. 253 is a switch provided on the pen,
Coordinate input can only be performed when the switch is pressed. Reference numeral 254 denotes an LED array installed at the edge of the document placement glass 251 along the X and Y directions, and can be turned on and off as desired based on instructions from the CPU of the main body. Reference numeral 255 denotes an operation unit which controls control input/output commands to the copying apparatus.

FIG. 10 is a top view of the operating unit, and the functions of each key will be explained in order.

100a-c are function keys, respectively;
It can be set arbitrarily using each key on the operation unit. This is a copy mode storage and recall key, and can store up to 5 types of modes. In other words, it is possible to memorize the mode that the user uses on a daily basis, the unique magnification used by each user, or the area specification area described later, and instantly by pressing one key. In a copying machine that allows a desired copying mode to be set, the memory is always maintained by a backup power source.

Numeral keys 101 to 110 have a normal number-of-sheets setting function and, in combination with an asterisk key, a function of inputting various data in various asterisk modes.

Reference numeral 111 is a clear key for clearing the set number of sheets or data, and reference numeral 112 is a reset key for returning the set mode to a predetermined standard mode, returning to the normal copy mode.

113 is a preheating key, and 114 is an asterisk key for shifting to various asterisk modes. 115 is a copy stop key, and 116 is a color key for selecting a plurality of developing devices built into the main unit.When a color developing device is selected, a built-in LED 150 lights up, including as a warning. do.

151 is a copy start key, and the LED is green when copying is possible (excluding copying), and red otherwise.
(151) is lit and displayed. 119 is the AE key,
An AE mode is selected in which the original density is detected and the developing bias is corrected to obtain a copy with an appropriate density. still.

When the AE mode is selected, the display 152 lights up.

Reference numerals 118 and 120 are manual density adjustment keys, and the density level can be increased or decreased using keys 118 and 120 to obtain a desired density. Note that pressing the key 118 increases the density (darker), pressing the key 120 lowers the density (lighter), and the density level on the display 153 changes accordingly. 152 and 153 are display groups indicating the above density conditions. 154 is a 7-segment display that displays the number of copies.

Reference numeral 121 denotes a cassette selection key, which is used when manually selecting a cassette stage.This apparatus also has an automatic paper selection (APS) function.

155 is a display group indicating the stage selected by the cassette selection key 121 or the APS mode.

122 is a fixed enlargement magnification selection key, 123 is a fixed reduction magnification selection key, and 124 is an automatic magnification selection key (Auto
Magnifica-tton 5elect
:AMS) key.

It has a function to automatically select an appropriate magnification based on the detected original size and the selected cassette size. In addition, AMS
If mode is selected.

Indicator 158 lights up. 125 is a zoom key,
It is possible to adjust the magnification in 1% increments using the 10 key and the - key. Reference numeral 126 is an equal magnification key, which sets the copy magnification to equal magnification (100%). Note that the display 157 lights up in the same-size mode. 156 is a dot matrix E type fluorescent display tube, and normally has a set copying magnification of 9 and a selected cassette size.

It displays the copy mode, etc., and also functions as a message display when there is an abnormality in the device, when the user makes a mistake in operation, or when there is a complicated operation procedure.

Reference numeral 127 is a copy selection key [single-sided→double-sided] for automatically copying two single-sided originals onto both sides of one sheet of paper using the intermediate tray in the main unit.

128 is a double-sided → single-sided copy selection key for copying two sheets of paper from a double-sided original to one side using an automatic circulation document feeder (RDF); This is a copy selection key for copying a double-sided original onto both sides of one sheet of paper.
is a multiple copy selection key for overlapping two or more images onto one sheet of paper to perform multiple copies using an intermediate tray.

Note that when any one of the keys 127 to 130 is pressed, one of the indicators 159 to 182 lights up correspondingly.

Reference numeral 131 is a page continuous copy selection key, which enables exposure scanning of the original on the document table into two parts from left to right with a single operation to obtain two copies (referred to as A copy and B copy). Select the mode to use.

Reference numeral 132 denotes a page continuous copy, multiple copy, and selection key, which has a function of multiple copying A copy and B copy in the page continuous copy mode described above onto the same sheet.

Reference numeral 133 is a page continuous copy/double-sided copy selection key, which has the function of copying the above-mentioned A copy and B copy onto the front and back sides of the same sheet using the intermediate tray.

Reference numeral 134 denotes a frame erase key which has the function of erasing a shadow that appears at one edge or in the center of a double-page spread in the page snapshot mode.

Reference numeral 135 is an image shift key, which allows the image to be shifted in either the left or right direction. Also, by pressing the numeric keypad while holding down this key, the shift amount can be adjusted. Further, this shift amount can also be stored in memory using the 1ooa-e function keys.

Reference numeral 136 is an area designation key, which also serves as a release key for the area designation area. Two modes can be selected for area designation: original priority (the size of the designated area is variable depending on the magnification ratio) and cassette priority (the size of the designated area is constant regardless of the magnification ratio). Reference numeral 137 indicates an X/Y key, which is a data input key when inputting area designation using the numeric keys.

Reference numeral 138 is an in/out key, which is a selection key for selecting whether to develop the inside of the designated area or only the outside.

Reference numeral 139 is a modification key, which is a data recall key for calling and modifying a set area value.

Reference numeral 140 is an automatic switching key for internal or external extraction (in/out) of an area in multiple copying and development color; when this mode is selected in multiple copying, A copy and B copy are selected. automatically 1n10ut
, the color can be switched.

141 is a one-color automatic switching function in page quick copying,
As mentioned above, it has a function to automatically switch the developing color for A copy and B copy, and when 141 is pressed, the display 170
lights up.

Each of the LEDs 157 to 171 is a selection mode display group indicating that each mode is selected.

Reference numerals 172 to 174 indicate the number of set areas, and in this copying apparatus, up to three areas can be set. Reference numerals 175 and 176 are display portions indicating inner/outer removal, which are lit in the mode set by the key 138.

The value of the set area for the 177 LED group is Xm1n.

This is an indicator that indicates which one is Xmax, Ymin, or Ymax(7).

Reference numeral 142 is an area designation key by COD, and by pressing one switch, the optical system starts scanning and executes only the function of recognizing the area drawn on the document.

143 and 144 are a sort key and a collate key, respectively.

Reference numerals 178 and 179 are indicators for indicating sort and collate modes, respectively.

FIG. 11 is a basic block diagram showing the configuration of the display section.

The CPU 201 is a microcomputer that controls each display, and controls the display elements, and the display contents are based on display (communication) data from the main body CPU.

206 is a fluorescent display tube with 40 characters of 5×7 dots.

Data of 7 bits x 5 bytes is required to constitute one character, and 35 bits of data are sequentially read from the character generator 203 according to instructions from the CPU 201 (7), transferred to the shift register/latch driver 204, and transferred to the shift register/latch driver 204. 5 bytes at 204
e minutes, ie, 35 bitc7) data is latched. After that, the shift register latch driver 205
A digit signal that determines the timing for displaying one character is driven, and one character is displayed. In this way, 1
Dynamic lighting for each character, duty ratio is 1/
It becomes a little less than 40 (due to blanking time).

In addition, 208 indicates other LED MATRIX of the display section.
It is driven by dynamic lighting.

FIG. 12 is a block diagram of the vicinity of the input section of the CPU 301 that controls the main body. The key matrix 302 is a group of switches provided for each input key, and is dynamically processed by the main body CPU 301 using well-known technology to determine which key has been pressed.

A digitizer 304 is configured so that the control circuit 305 detects the x and y coordinates of a location pressed with a light pen.

306 is a coordinate input trigger signal switch provided on the pen, and in synchronization with the trigger edge of this signal, the main body CPU
301 reads the coordinates of the pressed part.

FIG. 13 is a driving block diagram of an LED array that displays a designated area provided on the document table glass frame.

LED arrays 309 and 310 are respectively installed in the X and Y directions along the glass frame, and are controlled by the CPU 301 to dynamically light up.

FIG. 14 shows this situation, and if you now specify the outside of the shaded area in the figure, it corresponds to the area where the image will be formed. The LEDs indicating the X and Y coordinates light up (LE in the figure).
D (shaded area).

Moreover, if the inside cutout is specified, only the LEDs in the shaded area are turned off, and the other LEDs are turned on.

In addition, conversely, the LED of the part of the specified area where the image is not formed
may be displayed.

FIG. 15 shows a color detection circuit of the developing device.

Projection portion 3 provided on each developer unit 311, 312
11-1. Color detection switch 313, 3 by 312-1
Close 14. CPU301 turns ON1 the color detection switch
The color of the set developing device is determined based on the 0FF state.

That is, each developing device has its own switch pattern for each color, and as shown in the figure, if three switches are used for color detection, the configuration is such that 23-1=7 types of colors can be discriminated.

Next, consider setting an area.

When the area designation key 136 shown in FIG.
You can also change the mode by pressing 1' or 2° on the numeric keypad.This series of displays and operations is 13
It is executed only while the 6 key is pressed.

Here, the case where the document-based area specification mode is selected will also be explained. In this mode, if you specify an area on the X-axis (sub-scanning direction) and Y-axis (main-scanning direction) from the coordinate origin determined for the original, the specified area will be automatically copied even if you make a variable size copy. The magnification is changed to .

Xm1n coordinates, X using the numeric keypad and X/Y keys
Specify the points in the order of m a X coordinate, Ymin coordinate, and Ymax coordinate to complete the designation of l area.Specifically,
ax.

X/Y”, Y m l n * “X/Y”, Ym
ax.

Input in the order of ``X / Y''. Each coordinate is set in mm units.

When the “X/Y” key is input after setting the numerical value, 17
The 7 LED groups light up in sequence, allowing the user to confirm that the coordinates of each point have been input. Also, when inputting each coordinate, use the message meeting display to enter 1"Area l:Xm1n (to) the...0
00mm", so even a user using the device for the first time can easily set the settings.

In this way, when you finish setting one area with 4 points, 17
LED 2 lights up to indicate that one area has been set. Further, the external extraction mode is automatically selected and the display 175 lights up. In/out here
With the key 138, it is possible to change to the inner extraction mode.

Further, area designation can also be made using a touch panel using a group of transparent electrode switches on the document table 251.

In this case, place the original face up on the original table. However, the reference point at this time is in front of the left side of the document table, which is different from the reference point when actually making a copy (the back left side). In this state, the pressing pen 252 presses two diagonal points of a designated area (limited to a rectangle) on the document. At this time, press the input switch 253 while pressing with the suppression pen.The input switch 253 inputs the coordinates by the force at the moment of pressing or releasing. No coordinates are entered.

Here, when specifying coordinates with a pen, two coordinates, X and Y, are specified simultaneously with one press, so the 172 LED groups turn on two points at the same time. In addition, the input coordinates are numerically displayed on the message meeting display section at the same time as they are input, so that they can be visually confirmed. As described above, depending on the transparent digitizer input method, it is possible to set the compensation ball by specifying only two points on the diagonal line.

Next, area specification using COD will be explained.

First, a document for which area designation is to be performed is set on a document table and copied using a one-color developer (other than black). On the copied paper, a desired area is marked with a dark frame using a marker pen or the like. Here, the reason why the color development is performed is to create a difference in color density from the marker pen, so it is preferable to perform one color development so that the desired area can be identified. You can also cover the original with a transparent sheet or thin paper, and then mark from above. Place the 0th-order marked original (including transparent sheets, thin paper, etc.) on the original table again, and then perform area detection. When the key 142 is pressed, the optical system starts scanning and recognizes the marked area on the document by the COD provided on the optical path. Here, the area detection assumes that only one location can be recognized in one scan. Additionally, the coordinates of the recognized area are displayed on the message display so that the area can be confirmed.

The area can be specified using the three input methods described above, numeric keypad, touch panel, and COD, and up to three areas can be specified by freely combining these methods.

It is also possible to store an area in a specified state using the function key 1ooa-e.

Furthermore, the input area can be visually confirmed not only by the message display but also by the LED array 4 provided along the X-axis and Y-axis of the document table glass 1.

In this confirmation, the area is selected using the correction key 139, that is, pressing the correction key 139 once selects the first area, pressing it once again selects the second area, pressing it once again selects the third area, If you press it one more time, it will no longer specify the area. Pressing it again selects the first area again. Further X/
By selecting each XY coordinate using the Y key 137, the corresponding coordinates can be sequentially called up on the message display, and in this state, it is also possible to modify the set area using the numeric keypad. Of course, numerical values input and set using a transparent digitizer (touch panel), COD, etc. can also be corrected using the numeric keypad.

Also, by selecting an area using the modify key and pressing the clear key 111, it is also possible to erase only a specific area.

Once the area is set and the inside and outside edges are set in this manner, the inside or outside of the area is erased by the erase means during the copying process, thereby making it possible to obtain a desired copy.

Further, it is also possible to designate an area by making it possible to specify 0N10FF of the LED array using the operation section and lighting up the LEDs in a desired range.

When the CPU recognizes the coordinates of the area, it moves in the sub-scanning direction (X direction)
For, Xmin-Xma of the image formed on the drum
The blank exposure lamp (LED array) is turned on (inner extraction) or turned off (outer extraction) in the range corresponding to x, and in the main scanning direction (Y direction), Ymi of the image formed on the drum is
By turning on (inner cutting) or turning off (outer cutting) the LED array in the range corresponding to n to Ymax, a copy of the inner or outer region is obtained.

FIG. 9-2 is a diagram showing the document placement table.

A command section 320 is provided on the front side of the digitizer 304 formed of transparent electrodes, and a command is selected by pressing it with a pen in the same way as inputting coordinates when specifying an area. In this case, the coordinates pressed with the pen are read, and if the read coordinates are the document placement area, it is determined to be an area specification or magnification specification, and if the read coordinates are the command area,
Select the command corresponding to that coordinate.

Here, 321 is a command to copy the inside of the specified area in black, 322 is a command to copy the inside of the specified area in color (for example, red), 323 is a command to copy the outside of the specified area in black, and 324 is a command to copy the inside of the specified area in black. A command 325 is a command to copy the outside in color, and a command 325 is a command to clear coordinates input with a pen. In this way, the area and color can be specified using the digitizer.

Of course, the digitizer need not be provided on the original #L glass, but may be provided on the front side of the original cover, or may be separated from the main unit.

Digitizers can be based on various principles such as resistance value detection, capacitance detection, position detection using strain wheel detection, and position detection using light.

This copying apparatus has a C0DL8 original size detection means, a cassette size input means, and a zoom lens 16 for stepless magnification, thereby realizing AMS and APS.

When the copy key 117 is pressed, the optical system performs prescanning, inputs the original image at this time into the COD, and detects the original size. For this reason, the pressure plate 90 has a mirror surface to provide a density difference with the original so that the COD can correctly detect the original size. Here, the erase means prevents toner from being deposited on the mirror surface portion and forming a visible image. Furthermore, some documents may be detected as missing due to their high density. Therefore, once it is detected that there is no document, the 1 lighting voltage 9 judgment reference level etc. are changed and pre-scanning is performed again to detect the document size.

Furthermore, if the detected document setting position is more than a certain distance from the reference point, a message display warns that the document placement position is defective, and execution of the subsequent copy sequence is stopped. Similarly, when the C0D18 detects that the original is placed diagonally, a warning is displayed and the process stops. Incidentally, the slanted placement of the original is detected from the coordinates of the corners of the original and the inclination of the edge of the original.

However, since the user may intentionally place the device in this way, the warning cancellation switch (not shown)
If the warning cancellation mode is selected by #, the copy sequence is executed even in the case described above. However, in this case, AMS and APS can be executed by determining the X and Y coordinates of the farthest point as the document size based on the reference. Of course, an erase means is required for the portion determined to be outside the document.

Furthermore, if there is only a shift in the Y axis (optical system scan direction), it is not possible to automatically perform image shift and adjust the scan timing and paper conveyance timing to obtain a proper image.

Furthermore, even if there is a warning, it may be possible to ignore the warning and copy by pressing the copy key again.

If either the selected cassette size or copy magnification is specified for the document size detected as above,
The other can be automatically calculated and determined (AMS
, APS).

Here, the paper size calculated from the document size and magnification is not necessarily a standard size. Therefore, in this calculation, the first condition is to set the minimum cassette size that includes this calculated paper size, and in order to prevent it from being interpreted as being too large due to a slight installation error or detection error,
In the calculation process, the document size is made smaller (with some leeway) in small increments. in particular,
Both X and Y have a margin of 1 mm.

On the other hand, the appropriate magnification is determined by the original size and cassette size, but in general, changing the magnification from standard size to standard size (such as changing the size)
Therefore, if the detected document size matches or is approximately equal to the standard size, it will be given priority over the accurately calculated magnification.

It is also possible to select a specific magnification between these fixed types.

Furthermore, regarding the cassette size, in addition to the standard size provided by the manufacturer, special sizes are often used depending on the user or the country in question. AMS, APS
In order to perform this, the X and Y dimensions of these universal cassettes can also be registered. As with the desired area designation, there are three possible setting methods.

First, enter the asterisk (tree) mode to wait for input. At this time, dimensions are displayed interactively on the message display.

α Universal 1: X (vertical): mm.

Y (horizontal): mm” In the initial state where nothing is specified here, the maximum paper size such as A3 or LGR is set.

In this state, the dimensions in the X and Y directions are input in mm using the numeric keys.

Also, the paper size is set on the document table 251 and set using transparent electrodes, or the paper size is detected by COD scanning.

It is also possible to register. COD scanning is performed by the area detection key (142) mentioned above. These detections and registrations are valid only in the universal cassette registration mode of the asterisk (tree) mode.

In this way, APS and AMS of non-standard original size, non-standard cassette size, and arbitrary magnification can be executed.

On the other hand, a zero copying apparatus having an area specification function can also perform AMS or APS based on the size of the specified area and the cassette size or magnification, rather than the original size.

Next, the magnification setting method will be described.

In this copying apparatus, fixed magnification selection keys 122.12
3. In addition to setting the magnification using the arbitrary magnification (zoom) selection key 125, automatic magnification selection key 124, etc., the magnification can also be set using a transparent digitizer on the document table. In this case as well, the magnification can be set by selecting the 1 magnification setting mode using the asterisk (*) mode and specifying 2 points on the digitizer on the document table. That is, the magnification is set according to the ratio of the distance from the point of the first press to the document reference point: the distance from the point of the second press to the document reference point. 2
If you specify a point further away than the first press, you can enlarge the image, and if you specify a point closer to it, you can obtain a reduced image. This instruction will also be displayed on the message display.

“1 push: 2 push= mm:
It is also possible to determine the magnification by substituting binary values in the same way using the numeric keypad.By using these two magnification determination methods, the calculated magnification can be used by the copying machine. In some cases, the possible magnification ratio may be exceeded.With this copying device, it is possible to obtain the desired magnification ratio by repeating up to two consecutive copies, so if it is not possible with just the first copy, the second copy is performed at the same time. The copy magnification can be specified as follows.

“°000% lst: 000%, 2nd: 00
0%" After making the first copy, set the scaled image on the document table, enter the displayed magnification, and make another copy to obtain a copy with the desired magnification.

Therefore, in this apparatus having a copying magnification of 50% to 150%, it is possible to specify a magnification of 25% to 225%.

Incidentally, after the first copy, the second magnification may be automatically set.

Further, the copy magnification can be determined by combining digitizer input and document detection by CCD. In other words, if you use the pen to specify the position corresponding to the size you want to enlarge or reduce with the digitizer, set the original first, detect the original size during prescanning, and determine the copy magnification from the ratio of the two sizes. good.

FIG. 16 is a flowchart for determining the copy magnification using a digitizer or numeric keypad. First, the first
For example, enter the coordinates corresponding to the size of the original using a light pen or numeric keypad (step l), then
For example, the coordinates corresponding to the desired copy size are input (step 2). When inputting the coordinates, specify a point on the platen glass that is diagonal to the origin. In addition, when inputting with the numeric keypad, only the X or Y coordinate is sufficient, and the copy magnification is calculated from the input coordinate 2 / coordinate 1 (
Step 3) Determine whether the calculated copying magnification is within the variable magnification range of the device Step 4) If within the range, display the magnification (Step 8); If outside the range, display 2. Find the square root of the calculated magnification to check whether it can be copied in batches (Step 5), check whether the value is within the range that allows for scaling (Step 6), and if it is within the range. The first and second copying magnifications are displayed using the calculated square root value as the copying magnification (step 9), and if it is outside the range, a warning to that effect is displayed (step 10).

If the first and second copying magnifications are the same, that is, the square root of 9 magnifications, the second magnification setting becomes unnecessary.

In addition, the first and second copying magnifications do not need to be calculated using the square root, but the first copying magnification is the first copying magnification that is possible in one copying, and the first copying magnification is the first calculated copying magnification. The value divided by may be used as the second copying magnification, so there are many combinations. Also.

It is clear that a wider range of magnifications can be obtained by making 3rd or 4th copies, unless image quality is taken into account.

Next, we will explain the control of copying operations, focusing on functions such as page quick copying, multiple copying, and area specification, in Figures 16-2 and 1.
This will be explained using the flowchart shown in Figure 6-3. In step 11, it is determined whether the copy start key is turned on, and if it is turned on, the copy routine is executed (step 12).

The copy routine shown in FIG. 16-3 will now be explained. First, determine the copy magnification and copy density, and then
Adjust the developing bias, etc. (steps 30 and 31), and determine whether or not the color selection, i.e., color copy mode is selected (step 32); if not, select the black developer (step 33). , if it is in color mode, select a color developer (step 3)
4), and step 3 to determine whether there is an area specification.
5) If there is an area specification, it is determined whether or not it is based on the cassette when the magnification is changed.Step 36) If it is not the cassette standard, it will be the original standard, and the area itself will be scaled according to the magnification ratio. The area obtained by multiplying the setting area by the copy magnification determined in step 30 is set as the setting area (step 37
), therefore, when cutting out the inside or outside of the area,
All you have to do is turn on the blanking LED corresponding to this new area, and then check which mode the t n / out key is in, that is, whether it is inside or outside the area. 38), in
In step 39), set a flag to control the blank exposure lamp and erase the outside of the area.
If you are in t mode, set a flag to erase the inside (
Step 40).

In addition, if there is no area specified, the above control will not be performed, and it will be determined whether the mode is page snapshot (step 41). Step 42) A.
If it is a copy, set the flag to perform an A scan (scanning the left half of the document placed on the document table); if it is not an A copy, set a flag to perform a B scan (scanning the right half of the document). Set a flag on (
In step 44), if the page is not a quick copy, scanning is performed according to the size of the document. Then, expose, develop, and transfer according to the conditions determined by the above judgment.

A copying process such as fixing is executed (step 45).

The above is an explanation of the copy routine. Returning to FIG. 16-2 again, it is determined in step 12-1 whether or not it is double-sided copying, and if it is one-sided copying, the copy is stored in the intermediate tray with the copied side facing up (step 12-2), double-sided copying. If not, it is determined in step 13 whether or not there is multiple copying, and if there is no multiple copying, the paper is ejected to the paper output tray.
4) If it is a multiple copy, store it in the intermediate tray with the copied side facing down (step 15), and check whether it is in the automatic color and area conversion mode, that is, the first and second copies. Automatic conversion of inner and outer edges of areas during copying It is judged whether or not the key 140 or 41 for automatic conversion of 9 colors has been pressed (step 16), and if the automatic conversion mode is set, the inner and outer edges of colors and areas are extracted. , convert the outside exclusion (step 17).

Then, it is determined whether or not it is in the page quick copy mode (step 18), and if it is not the page quick copy mode, it waits for the manual copy start key input (step 20).
), if the page continuous copying mode is selected, the copy routine is executed again (step 21).

FIG. 16-4 shows an example of a case where an area is specified and a variable size copy is made without outside.

(a) represents the original, and the dashed line 350 represents the specified area. When scaling is done based on the original, the area is also scaled as shown in (b), and the image fits within the scaled area without being missing. . However, when copying with variable size based on the cassette standard (C)
As shown in FIG. 2, only the image is scaled and the area is not scaled, but there are cases where part of one image is missing.

Next, color conversion in double-sided copying in page quick copy mode will be explained. Place two originals (A4 size or smaller) on the original table and press the page continuous copy/double-sided copy selection key 133.
When the automatic color changeover key 141 is pressed, a mode is set in which pages are quickly copied in different colors and double-sided copies are made. When the copy start key 151 is pressed in this mode, only the original placed on the left side is scanned and the surface of the recording paper is stored in the intermediate tray with the copied side facing up. The developer is then automatically replaced to change the color, and the next document is scanned. At this time, the blank exposure lamp lights up while the first document is being scanned, and no latent image is formed on the first document.The recording paper stored in the intermediate tray is fed to the position of the registration roller, and two sheets are The recording paper is sent to the drum at the timing when the leading edge of the latent image on the original document coincides with the leading edge of the recording paper. Note that when forming a binding margin, the timing may be accelerated or delayed accordingly. The right original image is then copied onto the back side of the recording paper and ejected to the outside of the machine. In this way, a double-sided copy with different colors on the front and back sides can be obtained.

Note that if the switching device 41 is set on the lower side, the recording paper is stored in the intermediate tray with the copied side facing down, so multiple copies can be obtained with the original on the left and the original on the right in different colors. .

Furthermore, when performing double-sided copying or multiple copying, it is also possible to specify an area and copy.

Further, color conversion is possible even when not in the page snapshot mode, and in the multiplex mode or double-sided mode, the developing device is automatically replaced after the first scan, and the second scan is timed.

(Operation of COD) FIG. 17 is a circuit block diagram of this embodiment.
is a control microcomputer, 18 is a CCD image sensor, 401 is an A/D converter, and 402 is a CC
This is a D-driven Noculus generation circuit. 403 is a copy start signal from an external circuit, 404 is a document/area mode switching signal from an external circuit, 405 is a home position signal from the optical system home Φ position sensor 15, and 406 is from the image tip sensor 30. The image tip signal is 40
7 is the COD image number, the shift pulse signal of the sensor 18, 408 is the reference clock signal φ, 409 is the transfer lock signal φl of the CCD image sensor 18, 410 is the transfer lock signal φ2, and 411 is the CCD image sensor 18.
Reset pulse R3 of sensor 18, 412 is CCD
Image sensor 18 output signal CCD OUT, 4
13 is the clock signal A/D of the A/D converter 401
CLK, 414 is a digital signal DATA after A/D conversion of the output of the CCD image sensor 18.

14 is a lamp for document illumination, 415 is a lamp dimming circuit,
416 is a lamp on/off signal.

417 is dimming data.

The dimming circuit 415 is configured to apply a voltage proportionally corresponding to the value of the dimming data 417 to the lamp 14 .

To briefly explain the operation, first, microcomputer 4
When a copy start signal 403 is applied to 00 from the outside, a program for document detection and area recognition, which will be described later, is read from a ROM (not shown) and starts running.

First, the microcomputer 400 uses a built-in timer function to output a reference clock signal φ@408t3Jc and an A/D converter clock signal A/DCLK413 to the pulse generator 402) and A/D converter 401, respectively. From the reference clock signal φ・408, the COD drive pulse generation circuit 402 transfers the lock signal φl・409.
and φ2-410. and reset pulse R341
1 is made. The output signal C of the CCD image sensor 18 driven by these clock pulses is
CD 0UT412 is A/D converted by A/D converter 401, and its digital output DATA414
is read from the input port of the microcomputer 400. Original/area mode switching signal 404, home,
The position signal 405 and the image tip signal 406 will be described in the explanation of the flowchart to be described later.

Further, when dimming for the CCD image sensor 18 is required, the dimming circuit 415 turns on the lamp 14 in response to a lamp on/off signal 416. Microcomputer 400 is CC
A/D conversion value D of the output signal of the D image sensor 18
While looking at ATA414, read the dimming data CVRDATA
417 and dim the lamp 14 to an appropriate brightness.
The value of the dimming data 417 at that time is stored.

Furthermore, when performing AE, the lighting voltage of the lamp 14 is controlled by changing the value of dimming data 417 using AE data, which will be described later, so as to obtain appropriate exposure.

Figure 18 shows shift pulse 5h420, transfer lock φ
1・421, φ2・422 and reset pulse R
3, and the CCD output signal CCD 0UT42
4. A/D converter clock AD CLK425
, the output DATA 426 of the A/D converter, and the interrupt timing 427. FIG. The interrupt program will be described later.

FIG. 19 is a diagram showing the relationship between CVRDATA and lamp lighting voltage.

FIG. 20 is a simple principle diagram of the document detection method. 40
3 is the shift pulse signal s of the COD image pot sensor
h407.431 is the output signal of the CCD image sensor CCD0UT412.432 is the threshold level, 9
1 is a standard white board, 93 is a document placement reference position, 15 is an optical system home position sensor, 30 is an image tip sensor, 12
435 is a document table; 436 is a position where the output of the COD image fist sensor is processed by the microcomputer 400;

This is to process all the output data of the CCD image sensor in each line as shown in the figure. Shifting the processing position every l line is a means to prevent the detection accuracy from deteriorating as much as possible.

FIG. 21 is a conceptual diagram of area designation by marking.

441 is an original manuscript, 422 is a dummy copy made from the original manuscript, 433 is a dummy copy with markings, and 444 and 445 are obtained copies.

To explain the procedure, first set the original document 441 on the document table, perform the copying operation in dummy copy mode, and make a thin dummy copy 4 with colored toner such as red.
Get 22.

For this dummy copy 422, specify the area you want to specify by 4
Mark with a black marker as in 43. Place the marked Gummy 〇 copy on the document table, scan the optical system in area recognition mode, and let the marked area be detected. Next, once again, Original manuscript 4
By setting 41 on the document table and copying by specifying the inside and outside of the area, copies such as 444 and 445 can be obtained.

Reference numeral 446 indicates the name of each part when a marked original is processed by the original detection and area recognition program described later, and 451 to 456 are referred to as stages 1 to 6, respectively.

FIG. 22 shows the main flow of the document detection and area recognition program. The entire control program is set up so that this program is executed when the need for document detection or area recognition arises during the flow of the copying sequence.This flowchart will be explained according to the diagram shown in FIG. When the need for detection or area recognition arises, a program according to this flowchart is executed from step 1. In step 2, first, various counters (clock counter, line counter) etc. on the RAM are initialized.Next, in step 3, in order to generate various pulses to drive the CCD image sensor, the reference clock φ408 and A /D converter clock pulse A/DCLK413 is output. In this embodiment, two clock pulses are both oscillated by the timer function (with interrupt function) built into the microcomputer 400. Next step 4 Wait for the optical system home position signal 405, and if the signal is detected, proceed to step 5 and wait for the image tip signal 406.
If the image tip signal 406 is detected, in step 6, the interrupt is enabled. Then, in step 7, the process waits until the document or area detection completion flag is set. If it is set, the program is exited from step 8 and continued with another program.

FIG. 23 shows a part of the interrupt routine of the document detection and area recognition program, and the flow is executed at the timing shown in FIG. 18. When a 0 interrupt occurs, the main flow is entered from step 9. In step 10, a clock counter that counts the number of output data for each column outputted in time series from the CCD image sensor is counted up.

Then, in step 10, it is judged from the value of the clock counter whether or not it is the timing to output the shift pulse 407. If the timing is right, the process jumps to the sh line as shown in step 22. If not, it jumps to step 1.
In step 2, it is determined based on the flag whether or not the program currently being executed has multiple interrupts. If there are multiple interrupts, jump to step 21 and extract them from the interrupt program. If not, go to step 13 and check whether it is the data read position (timing) using the sample point value and the clock number counter value. Judgment is made by comparison (whether they match or not). If the sample point value and the clock counter value are different, the process jumps to step 21 and is extracted from the interrupt program. If they match, it is determined that the reading position is reached, and the process proceeds to step 14, where the original/area signal 404 is used. ,
Decide on the mode. If the area detection mode is selected, the process jumps to the bond detection mode routine as shown in step 23. If the document detection mode is selected, the process proceeds to step 15, where the A/D conversion value of the CCD image sensor output and the set threshold e level are determined. By comparing the values of the original platen 1 indicated by the current line counter and clock counter values,
Determine whether there is a document at the position above 2. If there is no document, the process jumps to step 18, and if there is a document, the process proceeds to step 16. In step 16, the clock counter value is stored as Xmaxl in the buffer. This value is updated every time there is a document in one line, and finally, the value of the clock counter at the time of the data for which it was determined that there was a document last among the data in that line is Everything will be stored for each line.

Next, in step 17, the maximum value of the clock counter value, the minimum value Xmax, Xm1n, the maximum value of the line counter value when it is determined that there is a document, and the maximum value of the line counter value for all lines processed so far, Minimum value, Ymax, Ym
Compare in with the current clock counter and line counter values, and update if necessary.

Next, in step 18, the A/D converted value of the COD image sensor output is stored in a buffer for one line. In step 19, it is determined based on the value of the clock counter whether data processing for one line has been completed, and if it has not been completed, the sample point, which is the collection position of AE data, is updated in step 20, and then step 21 is performed. If the interrupt program has been completed, in step 24, it is determined that there is a manuscript from the first data that is determined to have a jX manuscript among the A/D conversion values of the COD image sensor output for two lines. AE data counters corresponding to the maximum and minimum values of the data up to the last data are counted up. However, if an area for AE data collection is set, the AE data counter will only be counted within that area.
Do an up.

The AE data counter is prepared for all possible values, including the maximum value and minimum value of each line, and serves as data for performing AE.Next, in step 25, the value of Xmaxl is calculated. It is stored in a RAM specific to this line so that it will not be updated in the next line processing. Then, from step 21, the interrupt program is extracted.

FIG. 24 is a part of the interrupt routine of the document detection and area recognition program. If it is the area detection mode in step 14 of FIG. 23, the process jumps to step 26 of this figure as shown in step 23.
It is determined by the flag whether it is the first stage in FIG. 1, and if it is the first stage, it jumps to the 5EQI routine as shown in step 35. Step 30. 21 in FIG. 21, respectively. 3rd゜4th. Determine whether it is the fifth stage based on the flag, and if YES in each case, step 36. Step 37, Step 38. 5EQ2.5EQ3 as in step 39
．． Jump to 5EQ4, 5EQ5 routine, if NO, proceed to next.

In step 32, it is determined whether 1247 minutes of data processing has been completed based on the value of the clock counter,
If it has been completed, the process jumps to step 34 and exits from the interrupt program; if it has not finished, the sample point is updated in step 33, and then the process proceeds to step 34, where the interrupt program is extracted.

FIG. 25 is a part of the interrupt routine of the document detection and area recognition program. Figure 24 Step 27. Step 28. Step 29゜Step 30. From step 31, step 41 of this figure. Step 45. Step 49
．． Step 54. Jump to step 58.

Jumping to step 41, in step 42 C
The A/D conversion value of the OD image sensor output is compared with the value of the set middle threshold level, and it is determined whether the original is at the position on the original platen 12 indicated by the current line counter and clock counter values. Please judge. If there is no document, the process jumps to step 44 and then to step 40 in FIG. 24. If there is a document, the process jumps from step 44 to step 40 in FIG. 24 as a second flag in step 43.

Jumping to step 45, in step 46 C
The A/D conversion value of the OD image sensor output is compared with the set threshold level value to determine whether it is the level of dark spots. If it is not at the level of black spots, the process jumps from step 48 to step 40 in FIG. 24, and if it is at the level of black spots, the flag is set to the third stage in step 47, and the process jumps from step 48 to step 40 in FIG.

When the process jumps to step 49, it is similarly determined in step 50 whether there is a document, and if there is no document, step 5
3, and then jump to step 40 in FIG. 24. If there is a manuscript, proceed to step 50, and set
, Ymin.

Ymax value, current line counter, clock φ
The value of the counter is compared and updated. Next, in step 52, the flag is set to the fourth stage, and the process jumps from step 53 to step 40 in FIG.

When the process jumps to step 54, it is similarly determined in step 55 whether the level of the black area is high, and if the level of the black area is not, the process jumps from step 57 to step 40 in FIG.
If the level is black, the flag is set to the fifth level in step 56.
After setting the step, the process passes through step 57 and jumps to step 40 in FIG.

When the process jumps to step 58, it is determined in step 59 whether or not there is a similar document, and if there is no document, step 6
2 and then jump to step 40 in FIG. 24. If there is a manuscript, in step 60 Xm[n,
, Ym a x is the current line number counter, clock Φ
Compare with counter value and update. and step 61
Set the flag to the 6th stage in step 6
2 to step 40 of FIG.

FIG. 26 is a part of the interrupt routine of the document detection and area recognition program. If it is determined in step 11 of FIG. 23 that it is time to issue a shift pulse (407), the process jumps to step 33 of the figure as shown in step 22. Then, in step 64, a shift fist pulse 407 is outputted at the timing shown in FIG. In step 65, the line counter is counted up, and in step 66, it is determined from the value of the line counter whether the last line to be processed has been completed, and if it has been completed, the process proceeds to step 67 and the shift fist pulse 407 is The output of
AE data is created in step 72, and the interrupt program is extracted in step 72.If it is determined in step 66 that the program has not been completed, the process proceeds to step 70, where the sample point and l line end values are set, and step In step 71, counters and the like are initialized, and the interrupt program exits from step 72.

FIG. 27 shows the main flow of a document detection and area recognition program when using page memory. The entire control program is set up so that when the need for document detection or area recognition arises during the flow of the copying sequence, this flowchart will be explained according to Figure 0. When the need for detection or area recognition arises, a program according to this flowchart is executed from step l. In step 2, first, various counters (clock counter, line number counter) etc. on the RAM are initialized.Next, in step 3, in order to generate various pulses to drive the COD image sensor, the reference clock φ number 408, The A/D converter outputs the clock pulse A/D CLK, 413. In this embodiment, both of the two clock pulses are oscillated by the timer function (with interrupt function) built into the microcomputer 406. Then, in step 4, the system waits for the optical system home position signal 405, and if the signal is detected, the process advances to step 5, where it waits for the image tip signal 406.
5 is detected, the interrupt is enabled in step 6. Then, in step 7, the process waits until the document or area detection completion flag is set.

If it is set, the CCD output data on the page Φ memory is read in order in step 8, and it is determined in step 9 whether or not it is in area A (Fig. 21), and if so, in step 10, the corresponding data in area A is corresponded to. AE to do
The data counter is counted up, and if the data is not in area A, the AE data counter corresponding to the data in area B (FIG. 21) is incremented in step 13. Then, in step 11, steps 8 to 11 are repeated until processing is completed for all data,
When the process is completed, the extraction is performed from step 12 and the program ends.

FIG. 28 shows a part of the interrupt routine of the document detection and area recognition program, and the flow is executed at the timing shown in FIG. 18. When a 0 interrupt occurs, the main flow is entered from step 14. In step 15, a clock counter that counts the number of output data for each column outputted in time series from the COD image sensor is counted up. Then, in step 16, it is determined whether it is the timing to output the shift pulse 407 based on the value of the clock counter. If the timing is right, the process jumps to the sh routine as shown in step 27. If not, in step 17, the current Determine whether the program being executed has multiple interrupts based on the flag. If there are multiple interrupts, jump to step 26 to remove them from the interrupt program; otherwise, go to step 18
Then, it is determined whether or not it is the data read position by comparing the value of the sample point and the value of the clock counter. If the sample point value and the clock counter value are different, the process jumps to step 26 and the interrupt program is exited.

If they match, it is determined that it is the reading position, and the process proceeds to step 19, where the mode is determined based on the document/area signal 404. If it is the area detection mode, jump to the area detection mode routine as shown in step 28. If it is the document detection mode, proceed to step 20 and check the COD image sensor output A.
By comparing the /D conversion value and the certified threshold level value, it is detected whether or not the document is located at the position on the document table 12 indicated by the current line counter and clock counter values. If there is no original, the process jumps to step 23, and if there is a original, the process goes to step 21.

In step 21, the value of the clock Φ counter is
Store it in the buffer as m a x 1.

This value is updated every time there is a document in one line, and finally, the clock counter value at the time of the last data that was determined to have a document is the value for each line. Everything will be memorized.

Next, in step 22, the maximum value of the clock counter value, the minimum value Xmax, Xm1n, the maximum value of the line counter value when it is determined that there is a document, and the maximum value of the line counter value for all lines processed so far, Minimum value, Ymax, Ym
Compare in with the current clock counter and line counter values and update if necessary.

Next, in step 23, the A/D converted value of the COD image sensor output is stored in a buffer for one page. In step 24, it is determined based on the value of the clock Φ counter whether data processing for one line has been completed, and if it has not been completed, the sample point is updated in step 25, and then the interrupt program is exited through step 26. If the output has been completed, in step 29, the last data of the A/D conversion values of the COD image sensor output for 1 line, which is determined as having a document, is
The value of xl is stored in a RAM specific to this line so that it will not be updated in the next line processing. Then, from step 26, the interrupt program is extracted.

FIG. 29 is a part of the interrupt routine of the document detection and area recognition program. If it is the area detection mode in step 19 of the 28th UgJ, the process jumps to step 30 in this figure as shown in step 28. In step 31, it is determined based on the flag whether it is the first stage in FIG. 21.

If it is the first stage, jump to the 5EQl routine as shown in step 39, similarly step 32) step 33. In steps 34 and 35, the steps 2 and 3 in FIG. 4th. Determine whether it is the fifth stage based on the flag, and if YES in each case, step 40. Step 4
1. Step 42. 5EQ2.5E like step 43
Q3. Jump to the 5EQ4, 5EQ5 routine, and if NO, proceed to the next step.

In step 36, it is determined whether 1947 minutes of data processing has been completed based on the value of the clock counter,
If it has been completed, the process jumps to step 38 and exits from the interrupt program; if it has not finished, the sample point is updated in step 37, and then the process advances to step 38 to exit from the interrupt program.

FIG. 30 is a part of the interrupt routine of the document detection and area recognition program. Figure 29 Step 39. Step 40. Step 41゜Step 42. From step 43, step 45 of this figure. Step 49. Step 53
．． Step 58. Jump to step 62.

Jumping to step 45, in step 46 C
The A/D conversion value of the OD image sensor output is compared with the set threshold level value to determine whether the original is at the position on the original platen 12 indicated by the current line counter and clock φ counter values. to decide. If there is no manuscript, jump to step 48, jump to the 29th step 44,
If there is a document, the flag is set to the second stage in step 47, and the process jumps from step 48 to step 44 in FIG. 29.

Jumping to step 49, in step 50 C
The A/D conversion value of the OD image sensor output is compared with the set threshold level cr[, and it is determined whether it is the level of the ring defect. If the flag is not at the level of the ring, the process jumps from step 52 to step 44 in FIG. 29, and if it is at the level of the ring, the flag is set to the third stage in step 51.

The process jumps from step 52 to step 44 in FIG.

When the process jumps to step 53, it is similarly determined in step 54 whether there is a document, and if there is no document, step 5
7 and then jump to step 44 in Figure 29. If there is a manuscript, proceed to step 55 and set Xm1n, Xmax, Ym
in.

Ymax value, current line e counter, clock
The value of the counter is compared and updated. Next, in step 56, the flag is set to the fourth stage.

The process jumps from step 57 to step 44 in FIG.

When the process jumps to step 58, it is similarly determined in step 59 whether it is the level of the ring level, and if it is not the level of the ring level, the process jumps from step 61 to step 44 in FIG. After setting the level to 5, the process passes through step 61 and jumps to step 44 in FIG.

When the process jumps to step 62, it is similarly determined whether there is a document or not. If there is no document, the process jumps to step 66 and then to step 44 in FIG. 29. If there is a document, the process jumps to step 6.
4, X min , X m a x ,
Set Y min , Y max to the current line.
The counter is compared with the value of the clock φ counter and updated. Then, in step 65, the flag is set to the 6th stage, and then the process passes through step 66 to step 4 in FIG.
Jump to 4.

FIG. 31 is a part of the original detection and area new style program interrupt routine. If it is determined in step 16 of FIG. 28 that it is time to issue the shift pulse 407, the process jumps to step 67 of the figure as shown in step 27. Then, in step 68, the first
8 Shift pulse 4 at the timing shown in Figure 8.
Outputs 07. In step 69, the line counter is counted up, and in step 70, it is determined from the value of the line counter whether the last line to be processed has been completed. If it has been completed, the process advances to step 74 and the shift pulse is The output of 407 is fixed at high level, interrupts are disabled in step 72, AE data is generated in step 73, and the interrupt program is extracted in step 76.

If it is determined in step 70 that the process has not ended, the process proceeds to step 74, where the values of the sample Φ point and one line end are set, and the counters etc. are initialized in step 75, and the interrupt program exits from step 76.

FIG. 32 is a flowchart of the dimming program. When a sequence requires dimming for the CCD image O sensor, a program according to this flowchart is executed.

Start from step 1 and turn on the lamp in step 2.
The lamp is turned on by the off signal.

The dimming data at this time takes a preset value.

Next, in step 3, the reference clock φ・408, A/
The D converter clock, A/DCLK413, and shift pulse 5h407 are output and the CCD image sensor is driven.In step 4, the value of DATA414 after A/D conversion of the output of the COD image sensor is over. Determine whether or not it is flowing. If overflow has occurred, the process proceeds to step 5, where the dimming data 417 is counted down by 1, and the process returns to step 4, where this loop continues until there is no overflow.

If no overflow is found in step 4, the process proceeds to step 6, where the dimming data is counted up.Next, an overflow is checked in step 7, and the process returns to step 6 until an overflow occurs.

When overflow occurs, the process proceeds to step 8, where the dimming data is stored, and the dimming program is ended in step 9.

〔effect〕

As explained above, according to the present invention, when the input magnification is outside a predetermined range, it is divided into a plurality of magnification values and displayed, so there is no need to calculate the magnification from the second time onwards, and operability is improved. A wider range of copying magnifications can be easily realized.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the configuration of an embodiment of a copying machine to which the present invention is applied, FIG. 2 is a block diagram of a circuit that determines process speed, FIG. 3 is a timing chart of the entire device, and FIG. Timing chart of rotation, Fig. 5 is timing chart of potential control, Fig. 6 is timing chart of CCD dimming and CCD measurement, and Fig. 7 is a timing chart of CCD measurement. J is a timing chart of scanning, FIG. 8 is a timing chart of post-rotation, FIG. 9-1 is a perspective view showing an embodiment of a copying machine to which the present invention is applied, and FIG. 9-2 is a main view of a document mounting table. FIG. 10 is a main perspective view of the operating section unit, FIG. 11 is a block diagram showing the configuration of the display section, and FIG. 12 is a block diagram of the input section. Figure 13 is a block diagram of the drive circuit for the LED 7 rays.
4 is a diagram showing how the LED array is turned on, FIG. 15 is a color detection circuit diagram of a developing device, FIGS. 18-1 to 16-3 are flowcharts showing one embodiment of the present invention, and FIG. 16- 4
The figure shows an example of when a variable size copy is made with a specified area. FIG. 17 is a circuit block diagram of an embodiment of the present invention, and FIG.
The figure is a timing chart of control pulses, and Figure 19 is C.
Diagram showing the relationship between VRDATA and lamp lighting voltage, 2nd
Figure 0 is a diagram for explaining the document detection method, Figure 21 is a diagram for explaining area specification by marking, Figures 22 to 31 are sequence flowcharts for document detection and area recognition, and Figure 32 is a diagram for explaining the area specification by marking. It is a sequence flowchart of dimming. 1 is a photosensitive drum, 3 is a fixing device, 6 and 7 are developing devices, 8 is an intermediate tray, and 18 is a COD for document detection. E3 Figure 3 Copy key
427 210th

Claims (2)

[Claims] (1) A magnification input means for inputting an arbitrary copy magnification, a display means for displaying the magnification value input by the magnification input means, and a comparison means for comparing whether the magnification value is within a predetermined range. A copying apparatus comprising: when the magnification value is outside a predetermined range, the magnification value is divided into a plurality of magnification values and displayed. (2) The copying apparatus according to claim 1, further comprising means for automatically sequentially setting the plurality of magnification values.