JPH0798525A - Device and method for forming image of book document - Google Patents

Abstract

PURPOSE:To form the image of a book document at a desired position on transfer paper. CONSTITUTION:This device is provided with a book document read means reading the widely opened book document, an image reference position setting means setting an image reference position, an image reference position changing means 103 changing the image information of the need book document from the book document read means to image information in which the image reference position set by the image reference position setting means is set as the image reference position, and an image forming means forming the image information where the image reference position is changed by the image reference position changing means 103 on the transfer paper.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a document image forming apparatus and a document image forming method.

[0002]

2. Description of the Related Art A document reading device is a device for turning a page of a document by a page-turning device and reading the document, and is used in an image forming apparatus such as a copying machine or a facsimile.
The page turning device of this document reading device is a device that performs page turning by sucking and separating the pages of a book document that has been opened and placed facing downward, and that is opened and placed upward. There are known ones for turning pages by sucking and separating the pages of the book original, and for turning over pages of the book original placed with the rollers and arms opened facing upward.

However, the page-turning device has the problems that the page-turning reliability is poor due to the effect of the weight of the original and that the original surface is rubbed. Also,
Since the page turning device moves in the upper space of the original document, it is difficult to avoid becoming a large device. Therefore, the present inventor has proposed a document reading device having a page turning device that solves the above-mentioned problems and turns the main document with high reliability without increasing the size of the device. Here, the original document is a document in which a plurality of pages are bound so that they can be opened. This document reading device turns the pages of the original document by scanning the pages of the original document by storing the pages of the original document in the page storage unit by the page turning device and then discharging the pages.

[0004]

Generally, the pages of a two-page spread original do not have a standard size because the image is shrunk by the binding portion even if the paper has a standard size. Further, in most of the originals, the paper is out of the standard size. Further, there is also a book manuscript in which the end portion is cut after bookbinding so that it is out of the standard size. Therefore, in the image forming apparatus using the document reading device, the spread book document can be read and formed on the transfer paper of the standard size, but the image of the book document is read and the desired size on the transfer paper outside the standard size is read. In many cases, the transfer paper cannot be formed at a position, a desired margin cannot be formed on the transfer paper, and thus it is impossible to bind, file, or bind a plurality of transfer papers.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a main document image forming apparatus and a main document image forming method capable of improving the above-mentioned drawbacks and forming an image of the main document at a desired position on a transfer sheet.

[0006]

In order to achieve the above object, the invention according to claim 1 is a book document reading means for reading a spread book document, an image reference position setting means for setting an image reference position, and the book. An image reference position conversion unit for converting the original document image information read from the document reading unit into image information having an image reference position set by the image reference position setting unit as an image reference position, and an image by the image reference position conversion unit. An image forming unit that forms image information whose reference position has been converted on a transfer sheet is provided.

According to a second aspect of the present invention, the main document reading means for reading the two-page spread original document by slit scanning from the page edge direction, and the image reference position for reading the transfer paper front end, the transfer paper center, and the transfer paper rear side. Image reference position setting means selectively set at one of the edges, and an image having the image reference position set by the image reference position setting means as the image reference position read image information from the original document reading means. The image reference position converting means for converting the information into image information and the image forming means for forming the image information whose image reference position is converted by the image reference position converting means on the transfer paper.

According to a third aspect of the present invention, the main document reading means for reading the two-page spread original document by slit scanning from the page edge direction, and the image reference position for reading the front end of the transfer paper in the scanning direction, the center of the transfer paper, and the rear of the transfer paper. An image reference position setting means for selectively setting one of the edges and a default image reference position being the center of the transfer sheet, and image information for reading the original document read from the original document reading means. Image reference position converting means for converting the image reference position set in step 1 into image information having an image reference position, and image forming means for forming the image information whose image reference position has been converted by the image reference position converting means on a transfer sheet. It is equipped with and.

According to a fourth aspect of the present invention, in an image forming apparatus that scans a two-page spread original document from a page edge direction to read the two-page spread original document and form the image on the transfer sheet, a predetermined amount of image information of the two-page spread original document is read. It is provided with an image reference position moving means for moving the image from the reference position and forming it on the transfer paper.

According to a fifth aspect of the present invention, in an image forming apparatus that scans a two-page spread original document from the page edge direction to read it and form it on a transfer sheet, the movement amount of the transfer sheet image reference position is changed in millimeter units. It is provided with an input means for setting and an image reference position moving means for forming the spread book original read image information on the transfer paper by moving it from the image reference position of the transfer paper by the movement amount set by the input means. ..

According to a sixth aspect of the present invention, in an image forming method for scanning and reading a two-page spread original from the page edge direction to form a transfer paper, the page edge position of the two-page spread original in the scanning start direction is detected. Align the detected page edge position with the leading edge position of the transfer paper in the conveyance direction, and set the two-page spread image of the original to 1
Form on a sheet of transfer paper.

According to a seventh aspect of the present invention, there is provided an image forming method for scanning a two-page spread original document from a page edge direction to read the two-page spread document sheet to form a transfer sheet. The position is detected to obtain the length information in the scanning direction of the two-page spread original document, and the two-page spread image of the main document is set in the center of the transfer sheet based on the scanning direction length information of the two-page spread original document and the transfer paper length information. Form.

According to an eighth aspect of the present invention, in an image forming method for scanning and reading a two-page spread original from the page edge direction to form a transfer paper, the page edge position in the scanning end direction of the two-page spread original is detected. Based on the detected page edge position and the length information of the transfer sheet, the page edge position is formed on one sheet of transfer paper so as to match the rear edge position of the transfer sheet in the conveyance direction.

According to a ninth aspect of the present invention, there is provided an image forming method for scanning a two-page spread original document from the page edge direction to read the two-page spread original document and form it on a transfer sheet. The position is detected, the detected page end position of the left page of the two-page spread original is aligned with the leading end position in the transport direction of the first transfer sheet, and the detected central binding position of the two-page spread original is transferred to the second transfer. The two-page spread images of the original document are formed on two independent transfer sheets in accordance with the leading end position of the sheet in the conveyance direction.

According to a tenth aspect of the present invention, there is provided an image forming method for scanning a spread book document from a page edge direction to read the spread book document to form a transfer sheet. The center binding portion position is detected, and the left page in the scanning start direction of the double-page spread original document is detected based on the detected page edge positions of the left and right pages of the double-page spread original document, the center binding portion position, and the length information of the transfer sheet. Align the page edge position and the center binding position of the same to both ends of the first transfer paper, and set the center binding position of the double-page spread original and the page edge position of the right page to both ends of the second transfer paper. Together, the two-page spread images of the original document are formed on two independent transfer sheets.

According to an eleventh aspect of the present invention, there is provided an image forming method for scanning a two-page spread original document from the page edge direction to read the two-page spread document to form a transfer sheet. The position is detected, and the position of the central binding portion of the double-page spread original in the scanning start direction is set to the first position based on the detected edge position of the right page of the double-page spread original, the center binding position, and the length information of the transfer paper. The two-page spread images of the original document are aligned with the trailing edge of the transfer sheet and the page edge position of the right page of the two-page spread original document is aligned with the trailing edge position of the second transfer sheet in the transport direction. Form on transfer paper.

According to a twelfth aspect of the present invention, in an image forming method for scanning a double-page spread original document from the page edge direction to read the double-page spread original document and form it on a transfer sheet, the page edge positions of the left and right pages of the double-page spread original document are set. Based on the detected page edge positions of the left and right pages of the double-page spread original document and the length information of the transfer paper, the page edge position of the left page of the double-page spread original document is conveyed in the first transfer paper direction. The two-page spread images of this document are adjusted to two independent transfer papers by aligning the position of the leading edge and the position of the page edge of the right page of the two-page spread document with the trailing edge position of the second transfer sheet in the transport direction. Form.

According to a thirteenth aspect of the present invention, in the image forming method of scanning the spread book document from the page edge direction to read and form the spread paper on the transfer sheet, the position of the central binding portion of the spread book document is detected and detected. Depending on the position of the central binding portion of the double-page spread original document, the central binding portion position of the double-page spread original document is aligned with the rear end position of the first transfer sheet in the transport direction and the leading end position of the second transfer sheet in the transport direction of the double-page spread original document. The page image is formed on two independent transfer sheets.

According to a fourteenth aspect of the present invention, in an image forming method for scanning a two-page spread original document by scanning from the page edge direction and forming it on the front and back sides of the transfer paper, the page length and the transfer paper length of the main original document in the scanning direction are used. The image reference position on the front surface of the transfer paper is the trailing end of the transfer paper in the scanning direction, and the image reference position on the back surface of the transfer paper is the leading end of the transfer paper in the scanning direction.

According to a fifteenth aspect of the present invention, the spread book document is scanned and read from the page edge direction, the spread right page of the book document is formed on the surface of the transfer paper, and the spread left page of the book document is transferred. In the image forming method to form on the back side, the image right side page of the main document is aligned with the rear edge position of the transfer paper to form the image information of the double page spread right page on the front surface of the transfer sheet. The image information of the spread left page of the main document is formed on the back surface of the transfer paper by aligning the left end of the spread left page with the front end position of the transfer paper.

In the sixteenth aspect of the present invention, the spread book document is scanned and read from the page edge direction, the spread left page of the book document is formed on the surface of the transfer paper, and the spread right page of the book document is transferred. In the image forming method to form on the back side, align the center binding part of this document with the trailing edge position of the transfer paper, and form the image information of the spread left page of this document on the front surface of the transfer paper. The image information of the right-side spread of this document is formed on the back surface of the transfer paper in accordance with the position of the leading edge of the transfer paper.

According to a seventeenth aspect of the present invention, there is provided an image reference position setting means for selectively setting the image reference position at any one of the front end of the transfer paper, the center of the transfer paper, and the rear end of the transfer paper in the scanning direction, and the original document. Image reference position conversion means for converting the image information of the read original document into image information having the image reference position set by the image reference position setting means as the image reference position is provided, and the image reference position conversion means determines the image reference position. The converted image information is formed on the front and back sides of the transfer paper, and when the image reference position is set at the end of the transfer paper in the scanning direction by the image reference position setting means, images are respectively formed on the front surface and the back surface of the transfer paper. Each image reference position at the time of forming is switched to the rear end of the transfer paper and the front end of the transfer paper.

According to the eighteenth aspect of the present invention, the image reference position setting means for selectively setting the image reference position at any one of the front end of the transfer paper, the center of the transfer paper, and the rear end of the transfer paper in the scanning direction, and the original document. Image reference position conversion means for converting the image data of the read original document into image information having the image reference position set by the image reference position setting means as the image reference position is provided, and the image reference position conversion means determines the image reference position. The converted image information is formed on the transfer paper, and the image reference position is the transfer paper edge when the double-sided image forming mode is designated.

[0024]

According to the first aspect of the present invention, the two-page spread original document is read by the main document reading means, and the image reference position is set by the image reference position setting means. The image reference position conversion means converts the read original document image information from the original document reading means into image information having the image reference position set by the image reference position setting means as an image reference position, and the image forming means converts the image reference position. The image information whose image reference position has been converted by the means is formed on the transfer paper.

According to the second aspect of the present invention, the main document reading unit reads the spread main document by slit scanning from the page edge direction, and the image reference position is transferred by the image reference position setting unit to the front end of the transfer paper in the scanning direction, It is selectively set at either the center of the paper or the trailing edge of the transfer paper. The image reference position conversion means converts the read original document image information from the original document reading means into image information having the image reference position set by the image reference position setting means as an image reference position, and the image forming means converts the image reference position. The image information whose image reference position has been converted by the means is formed on the transfer paper.

According to the third aspect of the present invention, the main document reading means reads the two-page spread original document by slit scanning from the page end direction, and the image reference position setting means reads the image reference position and the transfer paper front end in the scanning direction, transfer. Either the paper center or the trailing edge of the transfer paper is selectively set, and the default image reference position is the transfer paper center. The image reference position conversion unit converts the image information of the original document read from the original document reading unit into image information having the image reference position set by the image reference position setting unit as the image reference position, and the image forming unit converts the image reference position. The image information whose image reference position has been converted by the means is formed on the transfer paper.

In the invention according to claim 4, the image reference position moving means moves the spread original document read image information by a predetermined amount from the image reference position of the transfer sheet to form it on the transfer sheet.

According to the invention of claim 5, the input means variably sets the movement amount of the transfer paper image reference position in millimeter units,
The image reference position moving means moves the two-page spread original document read image information from the image reference position of the transfer paper by the movement amount set by the input means and forms it on the transfer paper.

[0029]

FIG. 15 shows an example of a system to which the present invention is applied. This system includes a scanner unit 50 for reading a document.
0, and a printer 501 for forming an image, and the scanner unit 500 has a reading carriage (scanning unit) 200 for turning and scanning a document. The scanning unit 200 includes an image reading plate (SBC) 101 having a CCD (charge coupled device) for reading an original image, and a VPU (Video) for processing analog image signals from the image reading plate 101 to A / D conversion. Pro
(processing unit) 102, a fluorescent lamp and its inverter power source, a portion 502 which relays the signal line of the load system such as a heater, thermistor, fan, solenoid and the wiring of the power source line. This part 502 and VPU 102
Are independent flexible cables for IPU103
Connected with.

IPU (Image Processni)
g Unit (image processing device) 103 is equipped with a frame 104 for storing a read image signal, which is attachable / detachable by a connector, and a microcomputer in the IPU 103 includes a stepping motor for scanning the scanning unit 200 and a DC for driving a document table. A load such as a motor is controlled via the motor drive circuit 503, and a signal from the sensor is fetched. The printer 501 has a main control unit 107 including a main control unit for controlling copy mode, fetching key signals from the operation panel 99, and display control, and a sequence control unit for controlling copy timing. The sequence control unit and each microcomputer of the operation panel 99 mutually transmit and receive commands by serial communication. The main control plate 107 controls the input of sensors related to the image formation of the printer 501, the motor, the solenoid, the clutch, and the like to perform the sequence control of image formation.

FIG. 1 shows the data processing blocks of this system. This system is a book and sheet document reading device (hereinafter, referred to as TPS: Turn the Page Sc).
an “anner”) and an electrophotographic laser printer 501 that outputs a document read image. This system can also be configured with the image reading function of the original document and the page turning function independent of each other, but here, this system is a device in which both the page turning function and the image reading function are incorporated in one unit. ing.

This system is roughly divided into an image reading unit and an image data processing unit of the TPS, and an image forming unit including a laser printer. The image reading unit arranged at the right end of the scanning unit of the TPS includes a reading sensor 101 including a reading plate having a CCD, and a VPU 102.
Supplies a drive signal to the CCD based on the reference signal from the IPU 103, performs correction from the analog output signal from the reading sensor 101 to digital signal conversion, and obtains read image data of 8 bits for each dot.

Then, the VPU 102 sets each dot 8
Approximately 7.5 MHz by synchronizing the bit read image data with the clock and the gate signal in the main scanning direction and the sub scanning direction.
It is output to the IPU 103 at a speed of z, and the IPU 103 performs processing such as scaling of image data from the VPU 102 and high-quality processing of electrophotography. The IPU 103 performs gradation processing including γ correction in the final processing, converts it into video data of 4 bits for each dot suitable for writing, and stores the processed data in the frame memory 104.

In this TPS, the reading speed of the original document is 9
0 mm / sec. , Scanning speed of sheet original 12
0 mm / sec. , Image forming speed 180 mm / sec. Since there is a difference between the reading scanning speed and the image forming speed, the frame memory 104 for one page of A3 size is used for the speed buffer. Further, the frame memory 104 is effective for document protection during repeat copy because the TPS comes into contact with the original document to scan and read it, and the image data is repeatedly read out a plurality of times during the repeat copy. is there. Further, when pages are continuously shot by the TPS to print the left and right pages of the original independently, the images of the left and right pages can be divided using the frame memory 104 by one scanning reading, and the TPS constitutes an image forming unit. There is no need for synchronous scanning with the image writing of the laser printer 501 or rerunning.

Further, depending on the speed correspondence of the IPU 103, the frame memory 104 having a 4-bit dot structure is set in the IPU 1
Since the write data after the image processing by the IPU 103 is stored in the frame memory 104, the capacity of the frame memory 104 is halved for the read image data of 8 bits for each dot.

The capacity of the frame memory 104 is 400 DP
The image data of I is 128 Mbits for one page of A3 size, and is composed of a DRAM. Image data input from the IPU 103 to the frame memory 104 is performed in parallel for two dots of image data, and is about 3.8 MHz.
Sequentially at the speed of. On the other hand, in the image data from the frame memory 104, two dots of the image data are similarly output in parallel, and the IPU 103 is output at a speed of about 7.5 MHz.
It is sequentially output to the main control board 107 in synchronization with the clock sent from the device and the gate signals in the main scanning direction and the sub scanning direction.

The main control board 107 is the frame memory 1
The image data output from 04 at a high speed in accordance with the image forming speed of the laser printer 501 is converted into serial data of about 15 MHz, and a FIFO (First In FIRS)
t Out) memory further speeds up in the main scanning direction, about 1
Synchronize with the 8 MHz write clock. The 4-bit image data for each dot is pulse width modulated by the modulator to become light emission time data, which is transmitted to the laser (LD) controller as PWM data in synchronization with the write clock. The LD controller uses the PWM data to set L
L of electrophotographic laser printer via D driver
D105 is caused to emit light, and the photosensitive member is exposed and scanned to form an image.
The electrophotographic laser printer 501 forms an electrostatic latent image by exposing and scanning the LD 105 by uniformly charging a photoconductor with a charger, develops the electrostatic latent image by a developing device, and transfers the transfer paper by a transfer device. Transfer to.

The IPU 103 also controls the scanning of the TPS reading carriage (scanning unit) 200, and drives the scanner motor 106 which is a stepping motor for scanning the reading carriage 200. The scanner motor 106 scans the reading carriage 200 at a scanning speed of 90 mm at the time of reading a sheet original and the main original.
/ Sec. The scanning is performed at a constant speed, and when the magnification is changed, including the zoom from 71% to 141%, the reading carriage 200 is scanned at a linear speed of 1.41 to 0.71 times that.

Further, the scanner motor 106 is 120 mm / sec. The reading carriage 200 is scanned at the speed of. Main control board 1
Reference numeral 07 controls the image forming sequence of the laser printer 501 by taking in input signals from sensors related to image formation via the I / O 100 and outputting output signals to a motor, a solenoid, a clutch and the like. Also, IP
U 103 is an S for transferring the read image data to another system device such as a printer or a workstation.
Main control board 10 with CSI interface 98
7 receives a signal from the operation panel 99 and outputs a signal to the operation panel 99.

Next, the image reading signal processing in this system will be described. Read sensor 10 with CCD
1 is capable of reading about 5000 pixels and 400 DPI, and simultaneously reads the reflected light image of one line of the original in the main scanning direction and converts it into an electric signal. The electric signal from the reading sensor 101 is corrected by the VPU 102 such as a waveform correction such as a clamp.
Amplification and A / D conversion are performed and output to the IPU 103 as an 8-bit digital signal. Reading sensor 101
Is EVEN, OD for high-speed transfer of analog image data
It is divided into two systems of D and output to the VPU 102, and the VPU 10
In 2, a switching IC composed of an analog switch is used for EVEN, OD from the reading sensor 101.
The image data of D is synthesized into a serial analog signal and transferred. In this case, the image data transfer rate of one pixel is about 7.5 MHz in the original reading mode, and in synchronism with this, the combined image data is converted into an 8-bit 256-gradation digital signal by the A / D converter. Convert to. On the other hand, in the variable amplifier, in order to correct the fluctuation of the light quantity of the fluorescent lamp, the amplification degree is adjusted to an appropriate value according to the read data of the reference white plate.

FIG. 2 shows data processing of the reading scanner unit in the TPS. The analog image data continuous from the reading sensor 101 in the main scanning direction is V
In the PU 102, the base level of the waveform is adjusted by the clamp, and the sample is held in synchronization with the pixel clock. Next, the VPU 102 reads the image data and changes the amplification factor of the data according to the exposure light amount and the data level thereof, and an AGC (Auto Gain Cont).
processing is performed, analog image data is converted into 8-bit digital image data by an A / D converter, and read image data that is linear with respect to the document reflection density read by the CCD of the reading sensor 101 is obtained. next,
The VPU 102 performs logarithmic conversion on the read image data so as to handle gradation efficiently in accordance with the visibility. This logarithmic conversion is performed by an input / output 8-bit / dot LUT (LOOK
UP TABLE).

A digital image signal for each pixel indicating the image density from the VPU 102 is input to the IPU 103 for image processing. The IPU 103 is composed of a plurality of LSIs, controls the image processing of the digital image signal from the VPU 102, and controls the high image quality processing, and the main ones will be described below. 1. Shading correction The TPS of this system uses a linear light source of a fluorescent lamp,
The amount of light is maximized at the center of the CCD due to the condensing of the lens, and the amount of light is reduced at the end of the CCD. Also, C
The CD has variations in the sensitivity of each element. Therefore,
The IPU 103 performs both shading corrections on the digital image signal using the reference white plate read data for each pixel.

2. MTF correction In an optical system using a lens or the like, peripheral pixel information is affected by the performance of the lens or the like, and the reading output by the CCD becomes blunt. Therefore, the IPU 103
When obtaining one pixel data, the pixel data is corrected at the peripheral pixel level to obtain an image with high reproducibility.

3. Main scanning direction variable magnification In this system, the image reading and writing resolutions are the same 400 DPI, but the read pixel frequency of the frame memory 104 is about 15 MHz, and the frame memory 1
Since the writing pixel frequency of 04 is about 18 MHz and these are different, the IPU 103 performs the frequency conversion of the image data, and 50% to 200% of the image data.
A variable magnification process in the main scanning direction and the sub-scanning direction is performed. IP
U103 calculates the scaling value by calculating the peripheral pixel data.

4. The γ-correction electrophotographic laser printer has a non-linear density reproduction characteristic (γ characteristic of the printer), and the original density cannot be faithfully reproduced even if the image data from the scanner unit is used as it is. Therefore, the IPU 103 uses the conversion table to convert the image data into the writing exposure light amount that matches the printing characteristics of the laser printer. Further, the IPU 103 also realizes the density adjustment by changing the conversion value during the manual density adjustment. In addition, the IPU103 is masking,
Image conversion such as trimming, mirroring, black and white inversion, document size, position and density detection, marker detection, and other image detection are also performed.

The image data sent from the IPU 103 is converted into light energy by the LD 105. Optical writing type laser printer 501 in this system
Uses a method in which a laser beam from the LD 105 is deflected and scanned by a polygon mirror and is exposed on a photoconductor to form an electrostatic latent image. In addition, the modulation method of the LD 105 is
There are mainly a pulse modulation method that modulates the exposure time within one dot and a power modulation method that modulates the exposure intensity. The former method is used in this system. As a result, high image quality with resolution and gradation can be obtained.

Next, the TPS main document exposure method will be described. This system uses two as a light source for exposing the original document.
Two fluorescent lamps 201, 202 and two fluorescent lamps 203, 204 as light sources for exposing a sheet document are provided.
Two fluorescent lamps 201 and 20 as light sources for exposing this document
As shown in FIG. 27, the reference numerals 2 are arranged on both upper ends of the platen glass 205 arranged at the main document reading slit position in the direction orthogonal to the scanning direction of the scanning unit (carriage) 200.

These fluorescent lamps 201 and 202 expose the original document BO from both the left and right sides through the platen glass 205 to eliminate the density unevenness due to the left and right pages when reading the original document BO and the shadow of the original document binding portion BOa. There is. On the other hand, two fluorescent lamps 20 as light sources for exposing a sheet document
As shown in FIG. 27, reference numerals 3, 204 denote scanning units 20.
The fluorescent lamps 203 and 204 are respectively arranged at the sheet document reading slit positions in the direction orthogonal to the scanning direction above 0, and the fluorescent lamps 203 and 204 pass through the contact glass 206 on the upper surface of the present system and the scale 207 is placed on the contact glass 206. Sheet document S set according to
O is exposed from both the left and right sides to eliminate density unevenness and shadows when the sheet document SO is read, like the document BO.

Next, a method of correcting unevenness in density using the read image data amplification circuit of TPS will be described.
FIG. 3 shows the read image data amplification circuit. This read image data amplifier circuit includes an operational amplifier 301, a capacitor C1, resistors R1 to R9, and transistors Q1 to Q1.
It is a non-inverting amplifier circuit composed of Q5, and VPU1
Reference numeral 02 designates an analog image signal from the CCD 101, which is subjected to waveform correction such as clamp, sample hold, EVEN / ODD pixel combination, etc., and then amplified by a read image data amplifying circuit, A / D converted and IPU as digital data.
Transfer to 103.

The read image data amplifier circuit amplifies the input analog image signal VIN by the operational amplifier 301 and outputs it as an output signal VOUT. The 5-bit input signals G1 to G5 for setting the data amplification value are the transistors Q1 to Q1.
The resistors R3 to R7 are selectively connected by turning on / off the transistors Q1 to Q5 added to the base of Q5, and the gain of the read image data amplifier circuit is normally V.
It is set to the proper gain calculated by the AGC process in the PU 102.

The amplification factor of the read image data amplifier circuit is determined by the resistance value R composed of the resistor R1 and the parallel resistors R2 to R7, and is represented by VOUT = VIN (1 + R / R1). Therefore, in this read image data amplifying circuit, it is possible to select a magnification in 32 steps from approximately 6 times to 450 times depending on the set values of the input signals G1 to G5. In this example, the analog image data is corrected by adjusting the amplification factor of the read image data amplifier circuit. However, the same correction is performed by data shifting or multiplication of the A / D converted digital image data. May be.

By the way, the curvature and the shadow of the binding portion of the original are
Generally, it has a characteristic that it occurs at the same position in the main scanning direction. Therefore, in order to improve the density unevenness due to the original binding portion, the image data in the main scanning direction is sampled,
The image data of the line in the main scanning direction may be corrected in real time by the minimum density value which is the background portion of the original document. In this correction, the amplification factor of the read image data amplification circuit shown in FIG. 3 is determined by the peak value of the image data of the previous line in the main scanning direction. Or FIF
The image data for one line is delayed and sampled by the O memory, the peak of the lowest density value which is the background portion of the main document of the image data in the main scanning direction is calculated, and the shift of the digital image data is performed based on the value. The multiplication is performed so that the background density near the binding portion is equal to the background density at the page portion. Here, in general, since the background density in the page of the original is constant, the image density correction amount of the page is small, and the side effect due to using the minimum density value of the background of the original as a reference value is extremely small. .

In general, the left page portion of a two-page spread original document such as a publication is increased by the page turning operation, and the left end portion of the original document is moved upward and rightward with respect to the book cover position. On the other hand, the right page portion of the original document is reduced by the page turning operation, and the right end portion of the original document moves downward and rightward. FIGS. 4 to 6 show examples of such a transition of the left end portion of the document with respect to the number of pages to be repeated. In FIGS. 4 to 6, the position of the left end portion of the book spread original placed on the book base is set to “0”, and the left end portion of the book document increases to the right by the page turning operation. The amount is represented by the amount of displacement. Further, the displacement amount of the left end portion of the original document in the right direction is set as a plus value and displayed in millimeter units.

FIG. 4 shows the thickness of this document is 20 mm and the total number of pages is 75.
In the case of 0 pages, the thickness of this document is 12 mm and the total number of pages is 30 in FIG.
In the case of 0 pages, the thickness of this document is 9 mm and the total number of pages is 180, as shown in FIG.
The case of pages is shown, and the sizes of these originals are all spread B4 size. As is clear from FIGS. 4 to 6,
The left end portion of the original document is displaced to the right by the page turning, but the shape of the central binding portion is changed by this displacement, and the displacement amount of the left end portion of the original document does not necessarily increase monotonically. Further, since the central binding portion of the original document slides in the left-right direction due to the page turning, as shown in FIGS. 5 and 6, there is a point where the displacement amount decreases conversely in the page turning process, which is shown in FIG. In the case of a thin manuscript, it is also displaced to the left (minus direction). Furthermore, these displacements are
It also depends on the size and thickness of the original document and the quality of the paper. When the cover of this document is fixed on the pressure platen as in this system, abrupt displacement due to the flap of the spine of this document can be suppressed, but the top page position of the two-page spread document changes due to page turning. To do. This causes a deviation between the reading position and the page turning position.

Therefore, in the present system, the vertical displacement of the original manuscript releases the regulation of the pressure original table every time the scanning unit 200 scans and presses against the scanning unit 200 with a spring property so that the original manuscript becomes the maximum. Automatically correct the upper page so that it is on a uniform plane. Furthermore, in order to obtain an image effective range (page surface of a book that has been opened) suitable for image capture and printing, regardless of the displacement of the edge of the document,
Based on the image reading information of the reading sensor 101, the end position of the opened page of the book document is detected, and the image effective range of the book document is obtained with reference to the end position of the book document. When the spread size is A3, the edge portion (cover edge portion) of the original document detected by this system is about 210 mm from the center setting position at the reading position and about 30 mm from the home position of the scanning unit 200.
Is the position.

The edge detection of the original document in this system is performed by
This is performed by changing the read information in the sub-scanning direction by the specific pixel of the reading sensor 101. Reading sensor 101
The read data of is as shown in FIG. 7 at the edge portion of the document. Here, at the left end portion of the original document, the surface of the read original document is located below the image forming point of the reading sensor 101, so the focus is deviated, and the image becomes slightly blurred. Further, when the reading position has not reached the original, the original table or the back cover portion is read, and the level becomes the same as that of the black image.

When the reading position of the reading sensor 101 reaches the end of the original document, a striped pattern portion due to the edge group of each page of the original document is detected. Generally, most manuscripts
The background of the page is white, and there are no characters or images in the area of about a dozen millimeters from the edge of this document. Therefore, when this uniform color (white) continues, it is determined to be the end of the original document. The edge of the original document is detected at the end of the page-turning scanning in the direction opposite to the image reading direction.

As described above, by detecting the document surface based on the output information of the reading sensor 101, an effective image range suitable for image capture and printing can be obtained regardless of the displacement of the edge of the document. In general, double-page spread original B
As shown in FIG. 8, the edge portion of the original document of O is formed by stacking the edge groups of the original document sheet in an inclined shape, and the edge of the original document page is shaded by the illumination from the direction opposite to the inclination of the original document sheet. The striped pattern due to the edge group of each page of the document is emphasized and read.

In this system, the left and right pages are uniformly read when reading the original document, and the pair of fluorescent lamps 20 are arranged from the left and right sides of the original surface in order to read the curved portion of the binding portion of the original document.
Exposure illumination is performed at 1,202. Then, at the time of detecting the edge of the original, one of the fluorescent lamps is turned off or dimmed to emphasize the striped pattern due to the edge group of the original page at the edge of the original, thereby improving the accuracy of detecting the position of the edge of the original. That is, IPU1
In the latter half of the right-to-left page-turning scanning of the scanning unit 200, the microcomputer within
Turn on only 2. The microcomputer in the IPU 103 detects the right page edge of the double-page spread original for sucking the right page for turning the page, and turns off only the fluorescent lamp 202 on the right side to read when the scanning of the original surface is completed. .

By the way, in the method of detecting the page edge portion of the original document by the page edge group of the original document as described above, when the read page of the original document has an image similar to the striped pattern by the edge group of the page. , There is a possibility that the detection of the edge of this document will be erroneous. Therefore, when detecting the edge of the original document, the original document is compared by comparing the image of the illumination light from both sides of the pair of fluorescent lamps 201 and 202 with the image of the illumination light from one side of only one fluorescent lamp. It is possible to improve the detection accuracy of the end portion.

In this system, the microcomputer in the IPU 103 turns off or dims one of the fluorescent lamps at the time of detecting the end portion of the main document to emphasize and read the striped pattern by the edge group of the page at the end of the main document. Switching between the first mode and the second mode in which exposure is performed by both fluorescent lamps 201 and 202 to emphasize and read the striped pattern due to the edge group of the page at the end of the original, and the first mode and the second mode are switched. The image read data in the above mode is compared with the image read data, and the read data when there is a difference between the image read data is used as the detection data of the end portion of the document.

Further, the microcomputer in the IPU 103 compares the image read data in the first mode and the image read data in the second mode, and if the difference between the image read data is small, the read data is formed on a plane. It is determined that the read data is the read data of the image that is printed, and it is recognized that the read data is the image of the image to be printed in the original document page.
This method may be carried out for confirmation only when the detection result of the end portion of the original is doubtful. As described above, according to this method, it is possible to further improve the accuracy of detecting the position of the end portion of the original document.

9 to 14 show the copy operation timing in the main document mode of the present system. FIG. 9 shows an operation panel 99
FIG. 10 to FIG. 14 show the case where the edge of the original document is detected by the image in the initial mode after the print key is pressed. Shows the case of implementation. 10 to 14
In this case, the first original document reading operation and the image edge detection operation are the same as those in FIG.

In FIG. 9 to FIG. 14, the numerals indicate the read page numbers of the original document, and pages 2 and 3 and pages 4 and 5 form the spread pages of the original document. Further, the reference symbols RP and L of the read signal memory R of the frame memory 104.
P represents a right page (RP) and a left page (LP) of the read image data, respectively. Further, the page size of the main document in each mode is A4 size, two spread pages of the main document are continuously read by one scanning of the scanning unit 200, and the read image data is stored in the frame memory 104 for A3 size. The image data is stored as read data, image data is read from the frame memory 104 according to each output mode, an image is formed by the laser printer 501, and recorded on a transfer sheet.

FIGS. 9 and 10 show the case of the 1 to 1 copy mode in which the image of the main document in the spread state is output on A3 size transfer paper and one copy is made on the main document.
Shows the case of the 1 to 1 copy mode in which the images on the left and right pages of the original document are separately output for each independent page on the A4 size transfer paper, and one copy is made on the original document. FIG. 12 shows a case of a two-sheet copy mode in which an image of an independent page is output as in the case of FIG. 11, two copies are set, and two copies are made on the original document.

When the print key for instructing the start of copying on the operation panel 99 is turned on at the main document mode operation timing of FIG. 9, the microcomputer in the IPU 103 reverses the scanner motor 106 for scanning the scanning unit 200. The scanning unit 200 located at the center is moved in the reading start direction. When the scanning unit 200 moves to the reading start position of the left home position, the microcomputer in the IPU 103 drives the scanner motor 106 in the normal rotation direction to turn on both the fluorescent lamps 201 and 202 and perform scanning for reading the original. Let it start.

The microcomputer in the IPU 103 calculates the effective reading range from the paper size information (transfer paper length information from the transfer paper size detecting means) and the copy magnification information from the operation section 99 (see FIG. 80). ) The effective image area signal SFGATE in the reading sub-scanning direction for the original image is generated from the end point of the left page of the two-page spread original. Further, the microcomputer in the IPU 103 uses the effective image area signal SFGATE to cause the frame memory 10 to operate.
The data write signal memory W of No. 4 is operated to control the data write range.

The microcomputer in the IPU 103 starts detection of the right page edge of the original document when the cache 200 reaches the right page edge of the two-page spread original document, and calculates the page suction position when turning the page. When the scanning scan of the cache 200 is completed, the cache 200 starts the backward page-turning scan, and the storage position of the page-turning page is detected for the first time, and the image effective range is determined by the page storage position, and then the laser printer forms an image. To start. In addition, after the second time, the laser printer starts image formation immediately after the end of scanning in the image effective range calculated by the previously detected page storage position. The microcomputer in the IPU 103 uses the effective image area signal PFGATE in the sub-scanning direction on the laser printer side.
The data read signal memory R of the frame memory 104 is operated to output image data in synchronization with the laser printer. Further, when the page is turned, the page storage sensor repeatedly detects the page edge of the two-page spread original. By repeating the above steps, the pages of the manuscript are automatically turned to make double-page spreads of the manuscript.

FIG. 11 shows the case of the 1TO1 copy mode in which an image is output for each independent page of this document. In this case, in the reading mode, the operation is performed at the same timing as in the case of FIG. 10, and when turning the pages, the data read signal memory R of the frame memory 104 is operated by two PFGATEs in accordance with the transfer paper continuously conveyed by the printer. Is
Image data for each page of the original document is output. Since the address counter of the frame memory 104 is masked by PFGATE and stopped, the data of the second image on the right page connected to the first image on the left page of the original document becomes the second PF.
The GATE signal is read with a transfer paper interval in the laser printer.

FIG. 12 shows the case of a mode in which two independent pages of this document are copied as in the case of FIG. In this case, in the reading mode, the operation is performed at the same timing as in the case of FIG.
The data read signal memory R of the frame memory 104 is operated by the ATE, and a plurality of image data of each page of the original document is output. In this example, first, two images of the read left page are output, and then two images of the read right page are continuously output. While the laser printer is outputting a plurality of images, the TPS finishes page turning scanning, the carriage 200 stops at the reading scanning start position, and stands by for the next reading scanning.

FIG. 13 and FIG. 14 show the operation timing of the original document double-sided mode. In this two-sided original document mode, both sides of the transfer paper are copied in the same configuration as the front and back sides of the page of the original document. FIG. 13 shows a case where copying is performed in the order of read pages. This is because the image data of the right page of a two-page spread original is read from the frame memory 104 and formed on the surface of the transfer paper by the laser printer, and the transfer paper is reversed and conveyed to the double-side stack position via the double-sided conveyance path. To be done. On the other hand, TPS
Performs page turning once by scanning in the left direction, reads the next double-page spread of the original document, and stores the image data in the frame memory 104. The transfer paper that has been conveyed through the double-sided conveyance path in the laser printer is re-fed, the image data of the left page of the two-page spread original document is read from the frame memory 104, is formed on the back surface of the transfer paper, and the transfer paper is ejected. To be done. In the case of FIG. 13, there is a time until reversal for double-sided formation of the transfer paper and re-feeding by the transfer path, and 1TO1
The productivity of double-sided copying is low.

FIG. 14 shows the case of the 1TO1 high-speed double-sided copy mode in which the original document is copied using the frame memory 104 in a different reading page order. In this case, firstly,
The image of the first page on the right side of the spread of this document is formed on the surface of the first transfer paper, and the first transfer paper is conveyed by the double-sided conveyance path. Secondly, the next two-page spread and the third page of the original document are read, and the image data is read in the frame memory 104.
Memorized in. Thirdly, the image data of the third page is read from the frame memory 104, an image is formed on the surface of the second transfer paper, and the second transfer paper is conveyed by the double-sided conveyance path.

Fourth, the first transfer sheet at the double-sided stack position is re-fed, and the image data of the second page is stored in the frame memory 1
The sheet is read from 04, is formed on the back surface of the first transfer sheet, and the first transfer sheet is ejected. Thereafter, the image of the original document is output in the reverse order of the read spread pages, so that double-sided copying of the original document is performed at high speed. That is, in FIG. 9 and FIG. 10, the double-sided conveyance path conveyance period of the transfer paper is the same as the time until reversal for double-sided image formation of the transfer paper and re-feeding by the conveyance path. An image is formed on the next transfer paper during the road conveyance period, and a copy productivity about 1.5 to 2 times that of the conventional one can be obtained.

In the present system, in the double-sided copy mode, when a large number of copies with two or more copies are made, images are formed in the page order of the original document as shown in FIG.
An image is formed on the front surface of the transfer sheet of the designated number 9 according to 9, and the transfer sheet is once stored in the double-sided stack position and then re-fed to form the back side image of the designated number of sheets and then ejected. This system performs a stable page-turning operation against suction and separation of pages of the original document due to displacement of the suction roller. This is because the suction position is important because only the leading edge of the page is sucked and displaced upward and guided to the page storage section.

As described above, the page storage sensor detects the page edge of the document during the page-turning scanning of the document, and the suction and separation operation positions with respect to the page-edge of the document that change due to repeated page-turning are determined. To be done. That is, the page end portion on the scanning end side is detected from the page storage position data to determine the ascending position of the suction roller at the time of page turning scanning, and the same amount of pages is always sucked and separated. As described above, the present system detects the image range of the original document and the end portion of the original document by the page storage sensor, and therefore, does not use an independent detection unit.
The image reading position (registration) and stable page turning operation can be continuously realized from the beginning to the end of the original document.

In this system, as shown in FIG. 27, the scanning unit 200 has a turning belt 208 for turning pages of the original document BO by electrostatic attraction. By forming a charge pattern on the upper side by a high voltage power source, the turning belt 20
8 is electrostatically adsorbed on.

When the original pages electrostatically attracted onto the turning belt 208 are turned over, the turning belt 208 is swung upward by the turning belt upper and lower solenoids so that the end portion of the page attracted to the turning belt 208 is scanned by the scanning unit 200. Done by lifting to the side. At this time, the page storage sensor detects whether the original page has been turned. If the page detection by the page storage sensor is not performed at a predetermined timing during this page turning, the page turning scanning is re-executed.

The mirror switching solenoid is a solenoid for switching between the lower reading optical path for this original and the general upper reading optical path for sheet originals, and a keep solenoid is used. It The original image is displayed on the mirror 220 by the illumination of each fluorescent lamp.
An image is formed on the CCD of the reading sensor 101 connected to the VPU 102 through the lens 221 and the lens 216.
The VPU 102 generates a clock for driving the CCD,
The analog image signal output from the CCD is converted into a digital value by the A / D converter and output to the printer unit 501 including the above laser printer through the IPU 103 and the frame memory 104. Here, the frame memory 104 is used as a buffer for the reading linear velocity of the TPS and the process linear velocity of the printer unit 112. Also, IPU1
In 03, image data processing is performed.

The structure of the document table unit in the TPS will be described below. As shown in FIGS. 16 to 18, the document table 1 is formed of a resin plate having a thickness of 2 mm, and a material having a high friction coefficient such as an extremely thin rubber is attached to the upper surface of the plate. is there. The high friction coefficient material may be formed on the upper surface of the document table 1 by laminating, coating, spraying, or the like. In the document table 1 in this example, the document placing surface (upper surface) is formed to have an A4 size, and 1 is provided on each of the left and right sides of the apparatus main body center 2.
They are arranged one by one. A slide plate 3 is fixed under each document table 1. Each slide plate 3
Is made of sheet metal whose front and rear sides and outer side surfaces are bent downward, and adjusting studs 4 are fixed near the device body center 2 on the front and rear side surfaces, respectively. Each adjusting stud 4 has a hole at the end for fitting a slider pin described later.

On the other hand, the lower surface of the slide plate 3 is in contact with the upper surface of the upper and lower bases 5 having a low friction coefficient. Here, a rib of resin such as Teflon is formed on the upper surface of the upper and lower base 5,
It can move relative to the slide plate 3 smoothly left and right.
Further, the slide plate 3 and the upper and lower base 5 are relatively fixed by a size stopper 27 described later. On the lower side of the upper and lower pedestal 5, angles 7a and 7b with long holes in the left and right direction are provided at four front, rear, left and right positions. To the base 6 of this document table unit, another angle 8 having a fixed rotation axis and yet another angle 9 having a left-right elongated hole are fixed.

The link plate 1 is attached to the angles 8 and 7b.
0 is rotatably supported, and the link arm 11 is rotatably supported by the angle 9 and the angle 7a. With respect to the angles 7a, 7a, 9 the link plate 10 and the link arm 11 can be slid smoothly in the left and right directions, respectively. Furthermore, when viewed from the front of the document table unit, there are two arm plates 10 and two link arms 1 in the front and rear.
Numeral 1 is rotatably supported by studs 12 at X-shaped intersections.

Further, with the stud 12 as a torsion center, the torsion spring 13 causes the link plate 10 and the link arm 11 to rotate.
It is hung between and, by this torsion spring 13,
In FIG. 16, a force that constantly pushes the upper and lower pedestal 5 upward is working. The ascending / descending of the upper / lower table 5 due to this ascending force is performed by the scanning unit 200 whose vertical movement is restricted as described later.
Then, the document surface of the original document set on the document table unit comes into contact with the original document and is regulated. As a result, the pressure applied to the scanner unit 30 is maintained substantially constant regardless of the difference in the thickness of the original document.

The ends of the two left and right upper and lower pedestals 5 on the apparatus body center 2 side are connected to each other by a back support plate 14. The back support plate 14 is made of an elastically deformable material such as rubber, and the back cover of the original document BO is set on the back support plate 14. The back support plate 14 is constantly tensioned in the left-right direction by the action of a tension spring 17 described later. That is, the upper and lower pedestals 5 are provided with hooks 15, and the hooks 15 and the angles 16 of the link plate 10 are connected by the tension springs 17, so that the pair of left and right upper and lower pedestals 5 are pulled apart from each other. ing. As a result, tension is constantly applied to the spine support plate 14 and the spine cover of this document is supported without slack.

On both sides of the base 6, side plates 1 made of sheet metal are provided.
8 is fixed, and each side plate 18 has a fixing pin 19 on which an opening / closing lock claw 32 of a scanner unit 30 described later is hooked.
Is attached. A leaf spring 21 for pushing the scanner unit 30 upward when the scanner unit 30 is closed and an open / close lock sensor 20 for detecting the closed state of the scanner unit 30 are attached to one side plate 18. There is.

The size stopper 27 adjusts the interval between the left and right manuscript tables 1 according to the thickness of the original document to be placed, and fixes the slide plate 3 (manuscript table 1) and the upper and lower tables 5 relatively to each other. This is for allowing the document table 1 and the upper and lower table 5 to move integrally with each other. 18 and 19 show schematic configuration diagrams thereof. As shown in FIG. 17, a pair of angles 22 are attached to the lower side of the upper and lower pedestal 5 at predetermined intervals.
As shown in FIG. 18, a rod 23 is horizontally mounted and fixed to these angles 22. A sliding body 24 is mounted on the rod 23 so that it can slide smoothly in the longitudinal direction of the rod 23 through its through hole. A short shaft 26 is planted in the sliding body 24 so as to be orthogonal to the rod 23, and a stopper 25 is rotatably supported on the short shaft 26. Here, stopper 2
The locking hole 25a formed at one end of the cable 5 is loosely fitted to the rod 23, and the other end of the cable 5 is extended so that it can be gripped by a finger.

The sliding body 24 is fixed at an arbitrary position of the rod 23 by the stopper 25 inclining with respect to the rod 23 and the rod 23 and the locking hole 25a of the stopper 25 meshing with each other. That is, in the sliding body 24, the stopper 25 is normally tilted by the locking spring 28,
The rod 23 and the stopper 25 are integrally fixed to the rod 23, but in FIG. 19, the operator rotates the extended end portion of the stopper 25 with a finger in a direction against the elasticity of the locking spring 28. By doing so, the engagement between the rod 23 and the locking hole 25a of the stopper 25 is disengaged, and the rod 23 and the stopper 25 can move along the rod 23. The sliding body 24 is fixed to the slide plate 3 (not shown). Therefore, as described above, by fixing the slide body 24 to the predetermined position of the rod 23, the slide plate 3 (original table 1) and the upper and lower table 5 are opposed to each other via the slide body 24 and the rod 23. It can be fixed at any position.

20 and 21 show a schematic structure of the opening / closing lock mechanism of the document table unit. As shown in FIGS. 20 and 21, the TPS has a configuration in which the scanner unit 30 is placed on the document table unit 35. Both units 30 and 35 are connected to each other by a hinge 36 arranged on the rear side of the TPS, and have a shell-type opening / closing structure in which the front side of the TPS is opened. The open / close lock mechanism of the document table unit in the TPS is arranged in front of both units 30, 35. As described above, the side plate 18 is provided with the fixing pin 19.

As shown in FIG. 20, a shaft 31 is rotatably supported on the scanner unit 30 side across the left and right side plates, and open / close lock claws 32 fixed to both ends of the shaft 31 are provided on the shaft. It rotates according to the rotation of 31. An opening / closing lever 33 is fixed near the center of the shaft 31, and by rotating the opening / closing lever 33, the opening / closing lever 33 is opened / closed with respect to the fixing pin 19 on the document table unit 35 side via the shaft 31. The lock claw 32 is adapted to be disengaged.

The opening / closing lever 33 is provided with a spring 34, and the spring 34 urges the opening / closing lever 33 in a direction in which the opening / closing lock claw 32 is engaged (locked) with the fixed pin 19. As a result, in the state where the scanner unit 30 is closed as shown in FIG. 20, the open / close lock claw 32 engages with the fixed pin 19 and is locked with respect to the document table unit 35. Further, in this closed state, by lifting the opening / closing lever 33 against the urging force of the spring 34, the shaft 31 rotates and the opening / closing lock claws 32 from the fixing pin 19 on the document table unit 35 side.
21 is detached, and as shown in FIG. 21, the scanner unit 3
0 opens upward with the hinge 36 as the center of rotation, and the upper part of the document table unit 35 (document table 1) is opened.

Next, the document platen pressure fixing switching device and the document platen retracting device of this system will be described. The original platen 1, which is configured to be movable in the vertical direction by the link plate 10 and the link arm 11, is urged by a torsion spring 13 so as to constantly move upward. As a result, the scanner unit 30 can be
In the closed state, due to the rising behavior of the document table 1, the document surface of the main document BO which is opened and placed on the document table 1 is constantly pressed upward so as to be pressed against the lower portion of the scanner unit 30. There is.

The pressing force on the original surface of the original document BO is normally received by the scanning unit 200 in the scanner unit 30, but the scanning unit 200 is moved to a position on the original table 1 which is out of the original document. In this state, due to the rising habit of the document table 1, the document table 1 and the main document BO bite into the scanner unit 30 and the smooth movement of the scanning unit 200 is hindered. Therefore, with the platen 1 raised to an appropriate position, fix the platen 1 and
It is necessary to prevent the document table 1 and the main document BO from excessively biting into the scanner unit 30 due to the rising behavior of the document table 1.

Further, as will be described later, the scanning unit 200
When scanning the original on the contact glass 206 arranged on the upper part of the scanner unit 30 by switching the scanning optical path inside, the lower part of the scanning unit 200 and the upper surface of the original platen 1 are prevented from contacting each other. It is necessary to retract the document table 1 below. The platen pressurizing / fixing switching device and the document platen retracting device are devices for solving these problems, and FIGS. 22 to 27 show configuration examples of a mechanism in which both these devices are combined by one mechanism.

The control wire 40, which is one of the components of this mechanism, has a hook 4 at one end as shown in FIG.
1 is fixed, another hook 42 is fixed to the other end, and a spherical stopper ball 45 is fixed near the substantially central portion thereof. The hook 41 is fixed to the outer end of the link plate 10 (the side that moves up and down as the document table 1 moves up and down).
The control wire 40 extending from the hook 41 is connected to the pulley 4
6, the direction is changed via the pulley 47, the control pulley 48
Is wrapped around.

As shown in FIGS. 23 and 24, the control wire 40 is guided into the groove 50 of the control pulley 48, and the stop ball 45 fixed near the center thereof is fitted into the stop hole 49 of the control pulley 48. ing. This ensures that the movement of the control wire 40 is converted into the rotational movement of the control pulley 48. The control wire 40 wound and extended on the control pulley 48 is constantly pulled by one end of a tension spring 43 hung on a hook 42 at one end thereof. The other end of the tension spring 43 is hooked on a hook 44 fixed to the base 6 of the document table unit 35.

The control pulley 48, as shown in FIG.
It is supported by the shaft 54 via the one-way clutch 51. The shaft 54 is supported by a pair of side plates 55 on a slide bearing 52, and both ends of the shaft 54 are prevented from coming off by E-rings 53, so that the side plate 5 is interposed via the slide bearing 52.
It is rotatably supported with respect to 5. This causes the control pulley 48 to move toward the shaft 54 with respect to the arrow a in FIG.
Although the shaft 54 can freely rotate in the direction, it cannot rotate relative to the shaft 54 in the direction opposite to the arrow a by the action of the one-way clutch 51.
Rotates together with. Therefore, when the shaft 54 is fixed by the mechanism described later, the control pulley 48 becomes rotatable only in the direction of arrow a in FIG. 22, that is, in the rotation direction when the document table 1 is lowered.

Next, the lowering / fixing operation of the original platen 1 by this original platen pressurizing / fixing switching device will be described. Figure 2
2 to 24, when the shaft 54 is in a fixed state, when the original table 1 is pushed down by some external force, for example, the weight of the original document BO or the pressure applied by a curled page, the original table 1 is pushed down. The end of the control wire 40 fixed to the side on the hook 41 side is loosened. At the same time, the control pulley 48 is pulled by the tension spring 43 and rotates in the direction of the arrow a while absorbing the slack on the hook 41 side of the control wire 40, and the control wire 40 maintains the initial tension to the hook 44 side. Moving.

At this time, the control pulley 48 cannot rotate in the direction opposite to the arrow a due to the action of the one-way clutch 51. Therefore, even if the raising force of the document table 1 exceeds the pressing force on the document table 1. The control pulley 48 is not rotated in the direction opposite to the arrow a by the ascending force of the document table 1, and the control pulley 48 is stopped while maintaining the position rotated in the arrow a direction. Further, along with the stop of the control pulley 48, the movement of the control wire 40 is also stopped, whereby the document table 1 is lowered to a position where it is pushed down by an external force and then stopped.

Here, the fixing of the shaft 54 is performed by a document table lifting mechanism described below. That is, as shown in FIG. 25, the gear 56 is fixed to the shaft 54 so as to rotate integrally with the shaft 54.
Further, as shown in FIG. 26, the gear 56 is provided with a side plate 55.
The gear 57 meshes with another gear 57 rotatably supported by a stud 59 fixed to, and the rotation is transmitted to the gear 57.

Further, the gear 57 is formed integrally with the worm wheel 58, and the worm wheel 58 is constituted so that the worm gear 60 fixed to the output shaft of the document table raising / lowering motor 61 meshes with the worm wheel 58. With this configuration, when the document table raising / lowering motor 61 is stopped, the worm wheel 60 cannot rotate due to the meshing between the worm gear 60 and the worm wheel 58, and the gear 56 meshed with the gear 57 integrated with the worm wheel 58. The shaft 54 connected through the is fixed.

Next, the operation of retracting the document table 1 below the document table unit 35 will be described. 25 to 27, when the platen raising / lowering motor 61 is driven so that the gear 56 rotates in the direction of the arrow b, the one-way clutch 51 causes the control pulley 48 and the shaft 54 to rotate integrally, and the control pulley 48. 22 rotates in the direction of arrow a in FIG. 22, and the control wire 40 moves to the hook 44 side.

By the movement of the control wire 40, FIG.
In FIG. 3, the left and right original plates 1 are lowered, and the upper surface of each original plate 1 (the original surface of the original document BO in this example) is retracted to a position below the original plate unit 35, which is separated from the scanning unit 200. This retracting operation is executed when the power of the apparatus main body is turned on or when the apparatus is in a standby state in which scanning for reading is not performed, and when an original document on the contact glass 206 arranged above the scanner unit 30 is read.

Next, the operation of pressing the document table 1 above the document table unit 35 will be described. Contrary to the above-described retracting operation, in FIGS. 25 to 27, when the document table raising / lowering motor 61 is driven so that the gear 56 rotates in the direction of arrow c, the shaft 54 moves in the direction opposite to the direction of arrow a in FIG. The control pulley 48 is freely rotatable with respect to the shaft 54 by the action of the one-way clutch 51. Here, the force of the torsion spring 13 pushing the document table 1 upward is set to be stronger than the force pulling the control wire 40 downward.

Therefore, when the control pulley 48 can freely rotate in the direction opposite to the arrow a direction in this way, the control wire 40 is moved toward the hook 41 by the force of the torsion spring 13 that pushes the document table 1 upward. Move to. By the movement of the control wire 40, the left and right manuscript tables 1 are raised in FIG. 27, and the manuscript surface of the main manuscript BO which is opened and placed on the upper surface of each manuscript table 1 is pressed by the scanning unit 200. .

In this way, the left and right manuscript tables 1 are raised,
When the document table raising / lowering motor 61 is continuously driven in a state where the document surface on each document table 1 is in pressure contact with the scanning unit 200, the shaft 54 can be freely rotated with respect to the control pulley 48 by the action of the one-way clutch 51. Thus, the pressure contact state of the document surface to the scanning unit 200 is maintained. This pressing operation is executed only when the scanning unit 200 is on the document table 1, as described later.

As shown in FIG. 27, the platen pressurizing / fixing switching device and the platen retracting device are provided with a pair of left and right platen plates 1.
One set is provided for each of them, and they are independently controlled according to the moving position of the scanning unit 200. That is, a pair of left and right platen raising / lowering motors 61, which are driving sources for the platen pressure fixing / switching device and the platen retracting device, are driven by the microcomputer in the IPU 103 as shown in FIG. Are controlled independently of each other.

FIG. 28 shows the downward evacuation operation of the document table 1 in the evacuation operation mode described above, and FIG. 29 shows its timing chart. In this retract operation mode, I
As shown in FIG. 29, the microcomputer in the PU 103 reverses the left and right platen raising / lowering motors by a predetermined number of revolutions before starting the movement of the scanning unit 200 to move the left and right platen 1 as shown in FIG. Lower down.
After that, the microcomputer in the IPU 103 drives the scanner motor 106 to move the scanning unit 200 in a predetermined direction to perform scanning. If needed here,
This scanning is repeated many times. Then, when the microcomputer in the IPU 103 finishes the save operation mode,
Rotate the left and right platen lift motors forward a specified number of times,
Return the left and right platens 1 to their original positions.

Next, the pressurizing / fixing mode of the platen 1 will be described. When setting the original document BO on the TPS, as shown in FIG. 30, the spine of the original document BO is applied to the back support plate 14, the size stopper 27 shown in FIG. The document is moved according to the thickness of the document BO. By this movement of the slide plate 3, the spine cover of the original document BO is pinched by the inner ends of the left and right original plates 1, and in this state, the slide plates 3 are fixed by the size stoppers 27, and then the original document BO The reading start page is opened, the two-page spread original document is set on the left and right document tables 1, and the scanner unit 30 is closed. As a result, as shown in FIG. 20, the open / close lock claw 32 engages with the fixed pin 19 and the scanner unit 30 is locked with respect to the document table unit 35 in the closed state. At this time, the open / close lock sensor 20 detects that the scanner unit 30 is closed.

By the way, at the end of the operation of this TPS,
The scanning unit 200 returns to the central home position (center point of the set original document BO) shown in FIG. Therefore, even when the original document BO is set on the TPS, the scanning unit 200 is located at the center home position. As a result, the main document BO is set with the center of the TPS as a reference, so that when the scanner unit 30 is closed, any size of the main document can be reliably pressed and the setability of the main document is improved. It

By setting the main document as a central reference in this way, the control timing (reading start; reading start;
(Reading end timing, page turning start timing, etc.)
Is relatively easy to take. Further, by setting the main document as the center reference in this manner, it becomes easy to detect the edge of the main document, which is also an advantage.

On the other hand, when reading a document set on the contact glass 206 of the scanner unit 30, the
As shown in FIG. 7, the right end portion of the scale 207 arranged on the left side of the contact glass 206 serves as the end face reference with the reference set position of the document. As described above, in this case, the reference set position is different from the reading start position of the original document, and the configuration is set to the minimum size.
That is, by setting the reference set position of the document as the end face reference in this way, the reading start point of the document set on the contact glass 206 is always constant,
The control becomes easy.

When the TPS enters the sheet mode for reading the original on the contact glass 206, the scanning unit 200 moves to the left from the center home position and stops at the edge home position detected by the edge HP sensor. (FIG. 30), wait until the reading condition is input and the start button is pressed. Further, here, the scale 207 is arranged on the right side of the contact glass 206, that is, on the page-turning start side of the original document, the original document is placed on both the original table 1 and the contact glass 206, and the scanning unit 200 scans the original document. It is possible to read the original on the contact glass 206 at the same time as turning the original on the original table 1.

In the case of this configuration, the optical path of the reading optical path of the scanning unit 200 is switched during the page turning scanning of the original document, as described later. With this configuration, the reading direction in the sub-scanning direction of the scanning unit 200 is the same on the document table 1 and on the contact glass 206, and the sheet discharging direction is the same during printing, so that the memory is reversed. It becomes unnecessary.

Further, the original document BO is set on the document table 1 and the sheet document SO is set on the contact glass 206, and the scanning unit 200 is scanned from the end home position to read the original document BO on the document table 1. This scanning unit 2
While turning the pages of this manuscript BO with the return scan of 00,
A mode for reading the sheet document SO on the contact glass 206 can also be set. In this case, even during the read page turning operation of the main document BO, the read page turning operation of the main document BO is interrupted by setting the sheet document SO on the contact glass 206 and setting the interrupt mode. Both originals can be read without scanning. Here, the scale 207 is the contact glass 206.
An image obtained by reading the original on the contact glass 206, whichever is arranged on the upper side, is mirror-inverted in the main scanning direction and stored in the frame memory 104.

In this example, the reference set position of the original in the depth direction on the original table 1 and the contact glass 206 is configured such that the front side of the apparatus main body is the abutting reference, and the original table 1 and the contact are set. The original setting operation on the glass 206 is facilitated. Further, when the operation of the scanning unit 200 in this example is started, the central H
The P-sensor again confirms that the scanning unit 200 is in the central home position. Then, when a start signal is sent from the operation panel 99, the scanning unit 200 moves to the left from the center home position,
It stops at the end home position detected by the end HP sensor.

30 to 34 are transition diagrams of the scanning unit 200 when the original table 1 is in the pressure / fixing mode.
FIG. 35 shows the timing chart. As shown in FIG. 30, the end home position of the scanning unit 200 is a read page turning operation start point for the original document BO and an operation end point thereof. Further, in this end home position, the scanning unit 20
0 is not on the platen 1.

In the pressurizing / fixing mode of the original table 1, first, the microcomputer in the IPU 103 normally rotates the scanner motor 106 of the scanning unit 200 to move the scanning unit 200 to the right in FIG. Next, in the microcomputer in the IPU 103, the document pressing roller 281a on the right side of the scanning unit 200 is set to the document B.
When it reaches the left end of O (point A in FIG. 31), the left platen raising / lowering motor is normally rotated to put the left platen 1 on pressure. As a result, the original document BO is pressed against the scanning unit 200, and optimum reading is performed.

Then, as shown in FIG. 32, just before the scanning unit 200 reaches the center point of the main document, the right document pressing roller 281a is caught on the left end of the right document table 1 (point B in FIG. 35). . IPU10 at this point
The microcomputer in 3 causes the right platen raising / lowering motor to rotate in the forward direction to put the right platen 1 in a pressurized state. Then, the scanning unit 200 passes the center point of the book document and starts reading the right page of the book document BO.

After that, the left document pressing roller 281b engages with the right end of the left document table 1 (point C in FIG. 35). At this point, the microcomputer in the IPU 103 stops the left platen lifting motor and fixes the left platen 1 in a fixed state. As a result, the original document BO does not bite into the scanner unit 30 and the original pressing sheet 2
82b is pressed and fixed to the next scanning unit 200.
Keep the same height until the passage of.

FIG. 33 shows an operating state of the scanning unit 200 during reading or turning of the right page of this document. The microcomputer in the IPU 103 stops the scanning unit 200 that has finished reading the right page of the original document in a state where the left original pressing roller 281b hangs on the right end of the right original table 1 (point D in FIG. 34), and then stops. , I
The microcomputer in the PU 103 reverses the scanner motor 106 to move the scanning unit 200 leftward in FIG. As a result, the scanning unit 200
32. While turning up the right page of the original document BO, it moves to the left, and slightly before reaching the center point of the original document shown in FIG. 32, the left original pressing roller 281b is applied to the right end of the left original table 1 (point C). . At this point, the microcomputer in the IPU 103 causes the left platen raising / lowering motor to rotate in the normal direction to bring the left platen 1 into a pressurized state.

Then, the scanning unit 200 starts the operation of passing the central point of the main document and superposing the right page that is turned up on the left page of the main document BO. After that, the right document pressing roller 281a contacts the left end of the right document table 1 (point B). At this time, the microcomputer in the IPU 103 stops the right platen raising / lowering motor to fix the right platen 1 in a fixed state. As a result, this original B
O is pressed and fixed on the document pressing sheet 282a without biting into the scanner unit 30, and keeps the same height until the next scanning unit 200 passes. Then, the microcomputer in the IPU 103 moves the scanning unit 200 to the end home position shown in FIG. 30 and stops it.

Next, the structure of the scanner unit 30 will be described.

FIG. 27 shows the TPS (Turn the P
FIG. 1 is a diagram showing the overall configuration of the page scanner (page turning reader). In this TPS, a contact glass 206 is arranged on the upper part of the main body of the device, and a document such as a sheet material or a thick main document is set on the contact glass 206 by a pressure plate (not shown), and an optical path switching described later is performed. By scanning the document with the scanning unit 200, the document image on the contact glass 206 can be read. The upper half of the main body of the TPS device is the scanner unit 30, and the scanning unit 200 has the interior of the scanner unit 30 shown in FIG.
In, a document is scanned by traveling in the left-right direction. FIG. 36 shows a configuration diagram of the scanning drive system of the scanning unit 200.

FIG. 36 shows the scanning drive system of the scanning unit 200 as seen from above the apparatus body. The timing belt 312 has a pulley 304 and a three-stage pulley 30 on the inner side of the apparatus main body.
2, the timing belt 31 is provided on the front side of the apparatus main body.
3 is stretched in the left-right direction by a pulley 305 and a two-stage pulley 306. Pulley 304 and pulley 30
The rotation shaft of No. 5 is supported by a spring 307 and a spring 308, respectively, and applies a predetermined tension to each timing belt 312, 313.

The three-stage pulley 302 is the timing belt 3
The motor pulley 301 is connected to the motor pulley 10 at 10, and the two-stage pulley 306 is connected to the timing belt 311 at each time.
The timing belt 311 connects the idler 303 to the spring 30.
A predetermined tension is obtained by pulling outward at 9. The rear side and the front side of the scanning unit 200 are fixed to the timing belts 312 and 313 by the clamp 315, and the timing belt 31 is rotated by the rotation of the scanner motor 106 that drives the rotation shaft of the motor pulley 301.
2, 313.

FIG. 37 shows the structure of the scanning unit 200. Original pressing rollers 281a and 281b are rotatably supported on the left and right sides of the lower side of the scanning unit 200, and sheet winding rollers 280a and 280b are rotatably supported on the outer sides thereof. Each sheet winding roller 280a,
280b includes left and right independent document holding sheets 282a,
282b is wound around the center end thereof, and the outer ends of the document pressing sheets 282a and 282b are fixed to the side plates of the scanner unit 30, respectively. These document pressing sheets 282a, 282
Reference numeral 82b is a sheet-shaped member in which a rubber resin is melted from both sides to a cloth (cloth) woven with Tetoron yarn, and the unevenness of the cloth left on the surface causes an attraction force by charging to act. It has a difficult structure.

Further, the sheet take-up rollers 280a, 2
As shown in FIG. 38, one of the structures 80b has a double structure, and the take-up roller shafts 251a and 251.
b and cylindrical sheet winding rollers 280a, 280b
The spring springs 252a and 252b are attached between and. As a result, the take-up roller shaft 251
By rotating a and 251b further than the state in which the document pressing sheets 282a and 282b are stretched, a certain amount of tension can be applied to the document pressing sheets 282a and 282b by the action of the spiral springs 252a and 252b.

Further, as shown in FIG. 39, sheet winding gears 232a and 232b are fixed to the outer ends of the respective winding roller shafts 251a and 251b, and these sheet winding gears 232a and 232b are The left and right ends are fixed to the side plates of the scanner unit 30, and each idle gear 2 is attached to the drive rack 231 having teeth over substantially the entire length.
They are meshed with each other via 33a and 233b.
As a result, when the scanning unit 200 travels in FIG. 39, the sheet winding gears 232a and 232b rotate together with the idle gears 233a and 233b, and the winding roller shafts 251a and 251b and the spiral spring 2 respectively.
52a, 252b and each sheet winding roller 28
0a, 280b, through the respective original pressing sheet 282a,
282b is pulled out and wound up, and the tension of the left and right sheet winding rollers 280a and 280b is constantly
It is kept almost constant.

At this time, the document pressing sheets 282a, 282
Each sheet winding roller 280a depending on the thickness of 82b,
The sheet take-up rollers 280a, 280a generated depending on the position of the scanning unit 200 due to the winding thickening of 280b.
Original pressing sheets 282a, 282 wrapped around 80b
The outer peripheral difference of b is absorbed by the respective spring springs 252a and 252b.

On the other hand, as shown in FIG. 37, a platen glass 205 for reading the original and a turning belt 208 for turning the pages of the original are arranged between the original pressing rollers 281a and 281b. The platen glass 205 for reading the original document is arranged on the upstream side in the reading scanning direction of the scanning unit 200, and the turning belt 208 for turning the pages of the original document is arranged on the downstream side in the reading scanning direction of the scanning unit 200. There is. By arranging in this way, the run-up section for the reading scanning of the scanning unit 200 can be lengthened and the scanning can be stabilized. Further, in this example, the page turning mechanism is arranged on the lower side of the same unit and the reduction optical system is arranged on the upper side to realize the miniaturization of the apparatus.

Further, with this structure, the scanning unit 200 receives the main document (details will be described later) pressed by the left document pressing roller 281b and the turning belt driving roller 223, and these are pressed. Since the document surface (reading surface 273) positioned between the rollers can be read, an optimum image can be obtained. At this time, platen glass 2
As shown in FIG. 40, the lower surface position of 05 corresponds to the left margin of the document pressing roller 2 in consideration of the margin of the floating of the document surface in advance.
It is set above the horizontal plane (reading surface 273) formed by connecting the lowest point of 81b and the lowest point of the turning belt drive roller 223 by a slight gap α. This gap α
The value of is set so that 2α is equal to or less than the depth of focus of the optical system, and is determined according to the reduction ratio of the optical system.

As shown in FIG. 41, the platen glass 205 has its side portion supported by a glass holder 269. Further, a glass chamfered portion 271 is provided at the lower end portion of the platen glass 205, and a holder chamfered portion 270 is provided at the outer lower end portion of the glass holder 269. At this time, the position of the side corner portion 272 of the glass chamfered portion 271 is configured to be located above the lower surface of the glass holder 269 by a slight height β, and the platen glass is operated during the operation of the scanning unit 200. The side of 205 is prevented from catching the page edge of the original document.

On the other hand, inside the platen glass 205,
As shown in FIG. 37, two fluorescent lamps 20 for illuminating the original are provided.
Reference numerals 1 and 202 are arranged on the left and right sides of the document reading section. The original document image illuminated by these fluorescent lamps 201 and 202 is shown in FIG.
The second mirror 220 and the third mirror 221 after being reflected by
Alternately, and finally passes through the lens 216 to be reduced and imaged on the CCD of the reading sensor 101. Also,
The turning belt 208 is a turning belt drive roller 223.
It is wound around the turning roller 224, and the turning belt drive roller 22 above the turning belt 208.
A charging roller 225 is disposed in contact with the outside of the portion slightly separated from the No. 4.

Further, as shown in FIG. 39, a turning belt driving gear 234 is fixed to the end of the driving shaft of the turning belt driving roller 223. , Is engaged with the drive rack 232. As a result, the scanning unit 2
When 00 travels, the turning belt driving gear 234 rotates along with the idle gear 235 along the driving rack 232, and the turning belt driving roller 223 rotates to rotate the turning belt 2 at the same speed as the moving speed of the scanning unit 200.
08 rotates.

When reading a document set on the contact glass 206, the switching mirror 222, which is retracted to a position off the reading optical path of the scanning unit 200 as shown in FIG. By the action of 255, the scanning unit 200 is moved to the position advanced into the reading optical path as shown in FIG. By the movement of the switching mirror 222, as shown in FIG.
As shown in FIG. 3, the first mirror 219 and the second mirror 220
The optical path between and is switched from the platen glass 205 side shown by the broken line to the contact glass 206 side shown by the solid line, and the original image on the contact glass 206 illuminated by the two fluorescent lamps 203 and 204 is the original document. Similarly to the case of, the second mirror 220 and the third mirror 221 alternately reflect, pass through the lens 216, and are reduced and focused on the CCD of the reading sensor 101.

As shown in FIG. 42, the switching mirror 222 is supported by a switching mirror bracket 257, and the switching mirror bracket 257 is rotatably supported by the upper fulcrum 258 of the optical path adjusting plate 259. . The keep solenoid 255 is arranged at the end of the switching mirror bracket 257 on the side opposite to the side where the switching mirror 222 is supported.
When 55 is turned on / off, the switching mirror bracket 257 is swung about the upper fulcrum 258 of the optical path adjusting plate 259 as an axis between the position shown by the broken line and the position shown by the solid line in FIG.

As a result, the position of the switching mirror 222 is set to the scanning unit 200 shown in FIG. 37, as described above.
43 is selectively moved to the original document reading position retracted from the reading optical path and the sheet original reading position advanced into the reading optical path of the scanning unit 200 shown in FIG. Here, the retracted position of the switching mirror 222 outside the optical path (the position of the broken line in FIG. 42) is not particularly restricted by the movement of the keep solenoid 255, but the advance position of the switching mirror 222 into the optical path (FIG. 42). (The position indicated by the solid line in FIG. 2) restricts the swing of the switching mirror bracket 257 by the positioning pin 256, and the switching mirror 222
Regulate the stop position in the optical path of.

The switching mirror 222 is constructed so that the switched optical path can be adjusted. That is, as shown in FIG. 42, the optical path adjusting plate 259 is used for the scanning unit 20.
The lower part of the unit main body of No. 0 is rotatably supported by the lower fulcrum 262, and the spring 260 is provided in contact with both side parts between the upper fulcrum 258 and the lower fulcrum 262.
It is supported substantially vertically by the adjusting screw 261.

The optical path adjusting plate 259 is urged by a spring 260 so that it is normal and its fulcrum 258 rotates in a direction in which the switching mirror 222 is displaced.
The turning position of the optical path adjusting plate 259 due to this turning habit is determined by the head of the adjusting screw 261 arranged on the crocodile facing the spring 260 abutting on the side of the optical path adjusting plate 259. Therefore, this optical path adjusting plate 259
Rotates the adjusting screw 261 to lower the fulcrum 2
The position of the upper fulcrum 258 is varied around the axis 62, and the position of the switching mirror bracket 257 supported by the upper fulcrum 258 is displaced to change the position of the switching mirror 222.
It is possible to adjust the switched optical path by moving the position of.

In the optical system of the scanning unit 200, the mirrors other than the switching mirror 222 do not have the above-described optical path adjusting function, and the optical path for reading the original document on the platen glass 205 side is adjusted by the reading sensor 101. The position of the CCD is adjusted, and the optical path for reading the original on the contact glass 206 side is adjusted by adjusting the position of the switching mirror 222 by the above method. As a result, in the optical system, the number of adjustment points can be reduced, and the assemblability and maintainability can be improved. Further, in the optical system of this example, the keep solenoid 255, the connecting element thereof, and the like are housed in the scanning unit 200, and by removing the entire scanning unit 200 when exchanging the optical system element, its maintainability is improved. Is improving.

The optical path switching system described above may be configured as an optical system based on a switching mirror rotation system as shown in FIG. In this example, the switching mirror bracket 264 supporting the switching mirror 222 is rotatably supported by the unit main body of the scanning unit 200 at a fulcrum 265. The solenoid 263 is arranged at the end of the switching mirror bracket 264 opposite to the side supporting the switching mirror 222. When the solenoid 263 is turned on / off, the switching mirror bracket is switched in the direction opposite to the solenoid 263. Spring 26 pulling 264
By the action of 6, the switching mirror bracket 264,
It swings about the fulcrum 265 as an axis between the position shown by the broken line and the position shown by the solid line in FIG.

As a result, the position of the switching mirror 222 is set to the original reading position shown by the broken line in FIG.
The sheet material document reading position indicated by the solid line is selectively moved. Here, when the optical path of the switching mirror 222 is switched to the optical path for reading the original document through the platen glass 205, the switching mirror 222 is attached to the positioning pin 268, and the stop position of the switching mirror 222 is indicated by the broken line position in FIG. Regulate so that
Further, when the optical path of the switching mirror 222 is switched to the optical path for reading the sheet original through the contact glass 206, the switching mirror 222 is attached to the positioning pin 267, and the stop position of the switching mirror 222 is the solid line position in FIG. Regulate so that

Next, the turning operation of the scanner unit 30 will be described. FIG. 45 shows an operation explanatory diagram of the page turning portion of the scanning unit 200. The turning belt 208 is made of PET, PC, PVC or the like, and its surface layer is a high resistance film having a surface resistance of 10 ¹⁴ Ω or more, and its back surface layer is a low resistance film having a surface resistance of 10 ⁸ Ω or less. It is composed of a resin film having a structure.

The turning belt drive roller 223 is
It consists of a metal roller that is grounded and the surface of which is coated with conductive rubber to ensure reliable belt drive and grounding. Further, the charging roller 225 is composed of a metal roller, and a high voltage of ± 2 kV is applied to the charging roller 225 from the AC power supply 253 at a predetermined timing via the changeover switch 253a.

In FIG. 45, while the scanning unit 200 is running and the turning belt 208 is being driven, the changeover switch 253a is turned on at the timing described later, and a high voltage of ± 2 kV is applied to the charging roller 225 from the AC power source 253. Then, an alternating electric field is generated on the surface of the turning belt 208, and by the action of this alternating electric field, the top page 2 of the original document BO that comes into contact with the surface of the turning belt 208.
An attraction force for attracting 54 is generated.

When the manuscript reading operation is started,
As shown in FIG. 30, the scanning unit 200 at the left end home position of the scanner unit 30 starts traveling rightward in FIG. When the original reading position of the platen glass 205 of the scanning unit 200 reaches the left page of the main original BO, the optical system of the scanning unit 200 starts the reading operation of the main original BO as shown in FIG. The document surface of this book document BO is read from the left page to the right page.

The reading start position of the scanning unit 200 here changes depending on the size (size) of the original document BO, and also differs from the reading start position of the document on the contact glass 206 (reference end of the scale 207). In this way, the optical system of the scanning unit 200 makes the original document BO
47, the document scanning direction of the scanning unit 200 is reversed as shown in FIG. 47, and as shown in FIG. 48, the page-turning operation of the right page of the original document BO which has been read is completed. Is started.

When the page turning of this original document BO is started, a page turning belt 208 and a page feed roller 25 described later are provided.
0 is at the position shown by the broken line in FIG. 45, and the charging pattern portion formed on the surface of the page-turning belt 208 precedes this page-turning operation and is the top page 25 of the original document BO.
Overlay on 4. Then, when the leading end of the top page 254 crosses over the center of the lower side of the turning belt 208, as shown in FIG. 48, the turning belt 208 and the page feed roller 250 are operated by a solenoid (not shown). , To the position shown by the solid line in FIG. As a result, only the uppermost page 254 of the original document BO is attracted onto the surface of the turning belt 208 by the attraction force due to the unequal electric field of the charge pattern formed on the surface of the turning belt 208, and the uppermost page 254 is absorbed. 254 end of belt 20
Lifted with 8. The attraction force due to the non-uniform electric field has a feature that pages other than the top page 254 are not attracted.

Here, as shown in FIG. 52, the timing of charging the turning belt 208 is such that the scanning unit 200 which returns at the same time as the reading of the original surface of the original BO is completed.
Since the charging of the turning belt 208 is started with the return operation of the scanning unit 20,
The operation of 0 is efficient and efficient. However, as shown in FIG. 52, the distance L1 from the document reading position of the scanning unit 200 to the lowest point of the turning belt drive roller 223 is set.
Is set to be larger than the distance L2 from the contact point where the charging roller 225 is in contact with the turning belt 208 to the lowest point of the turning belt drive roller 223 (L1 ≧ L2), the scanning unit 200 performs the return operation. It may be set to start charging the turning belt 208 after the start.

As described above, the highest page 25 of the original document BO
After turning up 4, the scanning unit 20 is kept in this state.
As shown in FIG. 48, when 0 is moved toward the end home position, the top page 25 of this original document BO is
As shown in FIG. 49, the sheet No. 4 is sandwiched between the page turning roller 224 and the page feed roller 250 and is reliably conveyed, and a pair of upper and lower page guides 22 arranged on the right side of the scanning unit 200.
7 and 228 (FIG. 37) to pass the scanning unit 2
The front end side is sent to the outer right side of 00. At this time, the page turning sensor 214 (FIG. 37) mounted on the page guide 227 on the upper side of the scanning unit 200 detects the original page sent to the outer right side of the scanning unit 200, and the original page is detected. Judge that the page has been turned over normally.

As is apparent from this, in this example, the original page turned up by the page turning operation of the scanning unit 200 is held in a natural posture without being rolled or bent, and thus this turning is performed. The scanning unit 200 can be downsized because it does not damage the raised original page and it is not necessary to dispose the page storing means for storing the turned-up original page in the scanning unit 200.

Then, as shown in FIG.
When the uppermost page 254 of the above is turned up to the binding portion of the original document, the turning belt 208 and the page feed roller 250 are returned to their original positions (positions indicated by broken lines in FIG. 45). In this state, when the scanning unit 200 is further moved toward the home position of the end portion thereof, as shown in FIG. 51, the turned-up original page is pulled by the binding portion of the original document and a pair of page guides are pulled. While returning between 227 and 228, the document is ejected from the scanning unit 200 so as to be superposed on the left page of the document BO.

In this way, when all of the flipped original pages are superposed on the left page of the main original BO, the scanning unit 200 completes one original reading / page turning operation for the spread original. Here, this book manuscript BO
As described above, when the document reading / page turning operation is repeatedly performed on the document, or only one of the document reading or page turning operation is repeatedly performed,
At the same time that the turned-up original pages are all superposed on the left page of the main document BO, the moving direction of the scanning unit 200 is reversed, and the reciprocating operation of the scanning unit 200 is performed in the shortest course with respect to the original surface of the original document. repeat.

Next, the structure of the scanning rails of the scanning unit 200 will be described. The scanning unit 200 is shown in FIG.
As shown in FIG. 2, the scanning optical system unit 336 in which the above-described optical system is arranged is provided on the front side and the rear side of the scanner unit 30 with respect to the pair of scanning side plates 337a and 337b. The support rod 344a and the one support rod 344b on the back side are rotatably supported. Accordingly, the scanning unit 200 follows the relative twist of the pair of scanning side plates 337a and 337b arranged on the front side and the back side thereof, and the scanning optical system unit 336 thereof.
Scan optical system unit 3 so that it is not twisted
36 is configured to learn only for the scanning side plate 337a arranged on the front side.

On the other hand, on the side plate of the scanner unit 30,
Two scanning rails 343a and 343b, which are parallel to each other, are disposed on the front side and the rear side of the scanning rail 343 with their left and right ends fixed. These scanning rails 343a and 343
b has a substantially L-shaped cross-section, and the roller brackets 338a and 338b surround the scanning rails 343a and 343b so as to surround the scanning rails 343a and 343b.
It is attached to each 337b.

These roller brackets 338a, 338
Positioning rollers 339a and 339b are provided in the position b so that the horizontal portions of the scanning rails 343a and 343b are sandwiched therebetween.
And pressing rollers 340a and 340b are rotatably arranged. Here, each positioning roller 339
Reference characters a and 339b have a function of determining the vertical position of the scanning unit 200 at the time of reading the original document and turning the pages, and two a and 339b are provided on each scanning side plate 337a and 337b. On the other hand, the presser rollers 340a and 340b are respectively attached to the scanning rails 343a and 34e.
The horizontal portion of 3b is configured to be pressed from above.

That is, these pressing rollers 340a, 340a
As shown in FIG. 54, 40b is rotatably supported at the free end of a pressing roller bracket 346 formed in a substantially bell crank shape. This press roller bracket 346
Is the center portion of each roller bracket 338a, 338
It is rotatably supported by a stud 347 fixed to b. Further, between the base end portion of the pressing roller bracket 346 and each roller bracket 338a, 338b,
A pressure spring 345 is stretched around. As a result, the pressing roller 340a, 34a
0b presses the horizontal portion of each scanning rail 343a, 343b from above.

By pressing the pressing rollers 340a and 340b against the horizontal portions of the scanning rails 343a and 343b, the scanning unit 200 and the scanner unit 30 are pressed.
Of the scanning unit 339a and 339b are brought into contact with the lower surfaces of the horizontal portions of the scanning rails 343a and 343b by the displacement habit of the scanning unit 339a and 339b. 200 is positioned.

Further, the scanning unit 200 includes a lateral pressing roller 341 rotatably supported by a roller bracket 338a on the front side and the above pressing rollers 340a and 340b.
Roller bracket 338b on the back side with a pressure structure similar to
The horizontal pressing roller 342 for pressing the inside of the scanning rail 342 is arranged so that the horizontal portions of the scanning rails 343a and 343b are sandwiched from both outsides, respectively, so that the positioning in the depth direction is performed.

55 to 58, a page feed roller 250 is shown.
The configuration and action of The page feed roller 250 is shown in FIG.
Further, as shown in FIG. 58, a plurality of rollers are fixed to the shaft 248 at a portion corresponding to the width of the turning belt 208 with a predetermined interval. The page feed roller 250 is made of a material such as soft resin such as foamed polyurethane or rubber.

On the other hand, the width of the turning roller 224 is larger than the width of the turning belt 208, as shown in FIG.
As shown in FIG. 3, both ends of the turning roller 224 extend outside the turning belt 208. A drive roller 249 having a diameter slightly smaller than the diameter of the page feed roller 250 is fixed to the shaft 248 so as to correspond to the extending portions at both ends of the turning roller 224. The drive roller 249 is a page feed roller 250.
It is made of a material such as rubber, which has a higher degree of hardness.

This page feed roller 250 fits in the recess of the lower page guide 228 whose tip is formed in the shape of a comb when it is retracted to the position shown by the broken line in FIG. 45 (when viewed from the side). They are located so that they overlap each other).
Further, when the turning belt 208 is raised to the position shown by the solid line in FIG. 45, this page feed roller 250 also moves to the position shown by the solid line in FIG. 70, and each drive roller 249 is extended to both ends of the turning roller 224. Abutting on each other, a part of the peripheral surface of the page feed roller 250 moves to a position where it is slightly pressed by the turning belt 208.

As a result, the page feed roller 250 moves to the position shown in FIG.
As shown in FIG. 6, the page feed roller 250 is provided with a conveying force for the document page which is deformed by the diameter difference from the driving roller 249 and turned up by the turning belt 208. The rotational force of the page feed roller 250 is given by the rotational force of the turning roller 224 being transmitted through the drive roller 249 that is in contact with the page feed roller 224. At this time, the driving roller 249 rotates at the same peripheral speed as the contacting roller 224, but the page feed roller 250 rotates at a large peripheral speed because the diameter thereof is larger than that of the driving roller 249. As a result, "the linear speed of the page feed roller≥the linear speed of the turning belt", and a reliable page conveying force for the turned-up original page can be obtained. On the other hand, as shown in FIG. 51, when the turned-up original page is discharged from the scanning unit 200, the page feed roller 250 and the turning belt 208 are retracted to the positions shown by the broken lines in FIG. 45, respectively.

Page feed roller 25 constructed as described above
The operation of 0 is controlled by the toggle joint device shown in FIGS. 57 and 58. The shaft 248, which is the center of rotation of the page feed roller 250, has a toggle lever 274 formed in a bell crank shape as shown in FIGS. 57 and 58.
Is rotatably supported at one end of the. The toggle lever 274 is rotatably supported by the scanning unit 200 at a fulcrum 275. In addition, the scanning unit 200
An elastic spring 279 is stretched between the fixed pin 276 and the shaft 248 which are planted in the shaft, so that a straight line passing through the fixed pin 276 and the fulcrum 275 serves as a neutral line 278. Is configured.

As shown in FIG. 57, this toggle mechanism is in a state where the page feed roller 250 is retracted from the turning belt 208 to the position shown by the broken line in FIG. 45, and the turning roller 224 is shown by the solid line in FIG. When the ascending movement is started toward the position shown, the rotating shaft 224a of the turning roller 224 is
Engages with the other end of the toggle lever 274 and further rises while rotating the toggle lever 274. At this time, the shaft 2 is rotated by the rotation of the toggle lever 274.
The tension force of the spring 279 tries to return the page feed roller 250 to the original position until 48 exceeds the neutral line 278. However, when the shaft 248 crosses the neutral line 278, the tension force of the spring 279 increases. , And acts so as to bring the page feed roller 250 into contact with the turning roller 224. As a result, as shown in FIG.
In the state where it has finished rising to the position shown by the solid line,
By the tightening force of 9, the driving rollers 249 come into contact with the extending portions of both ends of the turning roller 224, and a part of the peripheral surface of the page feeding roller 250 is moved to a position where the turning belt 208 slightly pressurizes it. .

On the other hand, as shown in FIG. 51, when the turned-up original page is discharged from the scanning unit 200,
When the turning roller 224 retracts to the position shown by the broken line in FIG. 45, the turning roller 224 descends from the position shown in FIG. 58 while pushing the drive roller 249.
As a result, when the shaft 248 crosses the neutral line 278, the elastic force of the spring 279 acts in the direction of retracting the page feed roller 250 to the position shown by the broken line in FIG. 45, and the page feed roller 250 is shown in FIG. The turning roller 224 is returned to the original position by retracting to the position.

In this way, the page feed roller 250 moves from its retracted position in the direction in which it comes into contact with the turning belt 208 in association with the upward driving of the turning belt 208, so that the drive mechanism of the page feeding roller 250 is changed. It can be constructed inexpensively and compactly. The movement of the page feed roller 250 is
After the flipping belt 208 starts to rise, it starts with a certain time lag (in the latter half of the raising of the flipping belt 208). Belt 20
Even when protruding from 8, this turning belt 208
The end portion of the original page can be securely sandwiched between the page feed roller 250 and the page feed roller 250, and the margin of the page turning operation of the scanning unit 200 is improved.

In this example, as described above, the scanning unit 2
Every time the scanning of 00 is performed, the regulation of the pressure original platen is released, and the pressure original platen is pressed against the scanning unit 200 with a spring property, and the upper and lower sides of the original document are arranged so that the top page of the original document becomes a uniform plane. The directional displacement is automatically corrected. Further, the movement of the end portion of the document in the left-right direction is corrected by changing the leading edge position, the trailing edge position, and the page turning position by repeating the page turning.

FIG. 79 shows the image forming section of this system.
The image forming unit includes a printer main body 701 including the laser printer, a sorter 702 as a peripheral device thereof, a reversing unit 703, a double-sided unit and a large-volume sheet feeding tray 70.
4 bank 705.

In the printer body 701, the photosensitive drum 706 is rotationally driven by the drive unit and uniformly charged by the charger, and then an image is written by the image exposure by the semiconductor laser 105 to form an electrostatic latent image. The electrostatic latent image is developed by the developing device to become a visible image. Further, the paper is fed from a selected one of the paper feed trays 707 and 708 and the large-volume paper feed tray 704, or the paper is manually fed from the manual feed table 709, and the fed paper is the transfer charger. The visible image on the photosensitive drum 706 is transferred to the upper surface by 710, separated from the photosensitive drum 706 by the separation charger 711, and then the visible image is fixed by the fixing device 712 and sent to the reversing unit 703. . In addition, the photosensitive drum 706
After the paper is separated, the cleaning device removes the residual toner.

In the reversing unit 703, in the normal mode, the paper from the fixing device 712 is stored in the upper paper discharge tray with the image surface facing upward. Further, in the sort mode, the paper from the fixing device 712 is discharged to the sorter 702 and sorted into each bin of the sorter 702. Further, in the double-sided copy mode, the paper on which the surface image is formed from the fixing device 712 is sent to the double-sided reversing unit 700 provided in the bank 705 in the vertical direction. The double-sided reversing unit 700 switches back the fed sheets and sends them to the double-sided tray 720 so that the image forming surface faces upward, and stacks them. The double-sided tray 720 re-feeds the stacked sheets, and the sheets are discharged as a double-sided copy to the sorter 702 or the sheet discharge tray by the reversing unit 703 after the image is transferred and fixed on the back side as described above.

In the reversing mode, the paper from the fixing device 712 is once sent to the double-sided reversing unit 700. The double-sided reversing unit 700 switches back the fed paper,
This sheet is conveyed to the upper side and discharged with the image forming surface facing downward. At this time, the original document is read in the page order and the read images are formed on the paper, so that the discharged paper is kept in the page order.

Next, the detection of the right end of the original document in the sub-scanning direction will be described. FIG. 59 shows data for detecting the right end portion of the spread book document by the reading sensor 101 in the image reading method before the first page turning. The detected right end portion of the book document is a read sensor when the spread book document is the size A3. The position of 101 is about 21 from the center set position
The position is 0 mm. FIG. 65 shows data for detecting the right end portion of the double-page spread original document by the reading sensor 101 in the image reading method before the first page turning. The directional position is about 180 mm from the center set position.

During page turning scanning after image reading scanning,
The edge detection of the original is started from the position of the outer frame portion of the document table, and the reading sensor 101 first reads the outer frame portion of the document table,
Next, the black platen is read. The reading sensor 101 reads the level difference between the inside of the right cover and the edge of the page in this document, and then reads the background density which is the margin of the top page,
Generally, the image is read after a margin of ten and several millimeters. Continuous data from the reading sensor 101 in the sub-scanning direction is sampled and compared with a threshold value, the start of the margin portion of the uppermost page is detected, and the position is discriminated as the page end portion.

FIG. 60 shows a right end portion detection circuit of this document. The right end portion detection circuit of the original document detects the right end portion of the original document in the sub-scanning direction based on a change in read information by a specific pixel of the reading sensor 101 in the sub-scanning direction. Reading sensor 1
The specific pixel 01 in the main scanning direction is the 1024th pixel 64 mm from the reference of the reading sensor 101 in front of the apparatus in order to correspond to the original document placement reference on the front side and the minimum document size. The counter 401 is reset by the synchronization signal LSYNC synchronized with the main scanning of the reading sensor 101, counts the clock CLOCK synchronized with the pixel signal from the reading sensor 101, and reads the reading sensor 101.
The output signal which rises in synchronization with the pixel signal of the 1024th pixel from is output.

The data latch circuit 402 is a counter 401.
The pixel signal of the 1024th pixel in the image signal DATA from the reading sensor 101 is latched for each main scanning at the rising edge of the output signal of. Digital comparator circuit 40
Reference numeral 3 compares the upper 4 bits of the 8-bit data latched by the data latch circuit 402 with the threshold value. This threshold is set by the microcomputer in the IPU 103. The data from the digital comparator circuit 403 is delayed by one main scanning time by the D flip-flop circuits 404 and 405, and the AND circuit 406 removes the data from the digital comparator circuit 403 and the data from the D flip-flop circuits 404 and 405. Then, when the value of the data of the specific pixel of the reading sensor 101 is larger than the threshold value by 3 pixels in the sub-scanning direction, a detection signal is generated to notify the microcomputer in the IPU 103.

In the reading for detecting the end portion of the main document, the microcomputer in the IPU 103 causes the scanning unit 200 to start scanning to the left from the black main document table 1 at the right end portion in the scanning direction or the outer frame portion thereof. , Data latch circuit 402 and D flip-flop circuits 404 and 405
The reset signal RESET for starting the detection of is released. Then, a striped pattern portion of the main document which is continuous in the main scanning direction due to the edge or edge of the paper is detected by the reading sensor 101, and the image information on the right page is randomly detected from the end of the uppermost page of the main document.

The background of most books is white, and in general, there are no characters or images in the frame part which is a dozen millimeters from the end of the document. Therefore, the digital comparator circuit 403 determines and detects the blank portion of the page when the pixel signal of the 1024th pixel from the reading sensor 101 becomes the data of the white uniform color equal to or more than the threshold value. The accuracy of this determination can be improved by using the data of a plurality of pixels of the reading sensor 101 in the main scanning direction.
The number of pixels for the determination is the D flip-flop circuit 40.
Although 4 and 405 and the AND circuit 406 form three continuous pixels, it is also effective to increase the number of pixels or change the threshold value of the digital comparator circuit 403 according to the system and the adapted document. As a result of the above, when the spread book document of size A3 as shown in FIG. 59 is detected, the end of the book document is detected as a point 200 mm from the home position, and as shown in FIG. Is detected at a point 180 mm from the home position.

This original set on the basis of the center binding section is
The position of the leading edge of the image changes depending on the size, the page position changes depending on the double-page spread, and the page length changes depending on the binding portion. The result of detection of the edge of the document in the sub-scanning direction is IPU103.
It is used by the microcomputer inside to calculate the page suction position and the page rising position for turning pages. In another example, at the time of reading the original document, the left edge portion of the double-page spread original document is detected from the left portion of the original plate of the image data of the reading sensor 101 by the left edge portion detection circuit of the original document right edge portion detection circuit. It The microcomputer in the IPU 103 uses the detection signal at the end of the main document in the sub-scanning direction to determine the effective image range of the main document in the sub-scanning direction.
For example, in copying, it is used as a resist for determining the image position on the transfer paper, and an image outside the image effective range in the sub-scanning direction is automatically erased to prevent useless black solid images. When applied to a file system, etc., IP
The microcomputer in U103 reduces the image data by the detection signal of the end portion in the sub-scanning direction of the original document to save the memory amount.

Next, the detection of the end portion of the main document in the main scanning direction will be described. FIG. 61 shows an edge detection circuit for the main document in the main scanning direction. The reading sensor 101 detects the end portion of the document in the main scanning direction.
This is performed by changing the read data of one line of main scanning. As shown in FIG. 62, the two-page spread original document BO is aligned on the main document table 1 with the left end of the binding portion as the reference and with the left end of the back support plate 14 as the reference. Then, the front cover of the original document is fixed to the fixing plate arranged on the left manuscript table 1 and the back cover of the original manuscript is fixed to the fixing plate arranged on the right manuscript table 1 to continuously read the manuscript. The displacement of the uppermost page due to the displacement of the shape of the binding portion is prevented. The procedure for setting this document is as follows.

The left cover of the original document is held by the fixing plate on the left document table with the left end of the binding portion and the front side as a reference. Hold the right cover of this document with the fixing plate on the right document table. The reading start page of the original document is opened, and the scanning unit 200 is closed on the page so that the upper page of the original document is flat.

In this system, the maximum size of the original document is a spread with A3 size and the minimum size is B5 size. Further, there are sizes other than the standard sizes, such as A series and B series, of the original document, and in many cases, the contraction of the page due to the bending of the binding portion in the spread direction is not constant in the aspect ratio of the page. In this system, as shown in FIG. 62, since the original document is set on the document table 1 with the central front side reference,
The left edge, right edge, and top edge of the page differ depending on the size of the two-page spread original. That is, the image leading edge position and the trailing edge position in the sub-scanning direction and the trailing edge position in the main scanning direction change.

As shown in FIG. 62, at the time of page-turning scanning after the image reading of the original document, the end portion of the original document is detected from the position of the black outer frame of the original document outside the maximum original size of the spread original document in the sub-scanning direction. Then, the black original plate is read and the end portion is detected on the side of the spread original document. In this edge detection, the read data of the specific pixel in the sub-scanning direction of the read sensor 101 is continuously sampled, the data is compared with the threshold value, and the pixel whose read data is larger than the threshold value is repeated a plurality of times. The position is the page end position of the document in the sub-scanning direction. The microcomputer in the IPU 103 calculates a page suction / up position for page turning from the page edge position in the sub-scanning direction, scans the scanning unit 200 to that position, and temporarily stops it.

Next, the microcomputer in the IPU 103 detects the end portion in the main scanning direction at the position where the scanning unit 200 is temporarily stopped. The two-page spread original is set on the front side of the center, and the read data for one main scanning line is sampled at the position where the page adsorbing / raising position, that is, the image reading position is definitely on the two-page spread original. The data for one line starts from the position of the black outer frame of the original document table on the inner side of the maximum original document size, and then the black original document table and the spread original document. Edge detection in the main scanning direction is performed by comparing continuous data in the main scanning direction with a threshold value, and a position where a plurality of pixels whose read image data is larger than the threshold value is repeated in the main scanning direction is the main scanning direction. It is set at the page edge position.

In the example shown in FIG. 62, reading is performed in the direction of the arrow in both the main scanning direction and the sub scanning direction, and the edge position of the original document is calculated from the data. For example, if the size of the double-spread original document is B4 size, the left and right ends of the original document are about 182 mm from the center set position and about 257 from the front end.
mm. The scanning of the scanning unit 200 is started from the left home position where the reading scanning is started, and the read image data is stored in the frame memory 104 a few mm before the end position of the original document. The microcomputer in the IPU 103 uses the end portion of the original document as the start position of the effective image area in the main scanning direction and the sub scanning direction.
Image data output from 04 is instructed.

FIG. 66 shows the upper edge detection data of the spread book document BO by the reading sensor 101. When the spread book document size is B4 size, the upper end portion of the book document detected by the reading sensor 101 is at a position of about 270 mm from the front set reference position in the main scanning direction position. The reading sensor 101 starts detection in the front direction from the original frame outer frame position at the page suction / elevation position when the page turning scanning is stopped after the image reading scan, first reads the black original plate outer frame, and then Scan the black platen. Reading sensor 10
In this document, 1 reads the inside of the right cover, then reads the background density which is the margin of the top page, and generally reads the image after a margin of ten and several millimeters. The microcomputer in the IPU 103 compares the continuous data from the reading sensor 101 in the main scanning direction with a threshold value, detects the beginning of the margin portion of the uppermost page, and sets the position as the upper end portion of the page.

The end portion in the main scanning direction detecting circuit shown in FIG. 61 detects the end portion in the main scanning direction of the original by the change in the read data of one line of the main scanning by the reading sensor 101. Figure 6
As shown in FIG. 2, the two-page spread original document BO is set and fixed on the main document table 1 with the left end of the binding portion and the front as a reference.
Since the main document placement reference is on the front side of the main document table 1 and the main scanning one line of the reading sensor 101 is read from the back side of the main document table 1, data in the main scanning direction from the reading sensor 101 is read. Are rearranged in the reverse order by a FILO (first in last out) circuit 407 for one line.

The data from the FILO circuit 407 is latched by the data latch circuit 408 by the clock CLOCK and sampled for each main scanning line, and the upper 4 bits are compared with the threshold value by the digital comparator circuit 409. This threshold is set by the microcomputer in the IPU 103. The data from the digital comparator circuit 408 is the D flip-flop circuit 41.
The data from the digital comparator circuit 408 and the data from the D flip-flop circuits 410 and 411 are ANDed by the AND circuit 412 and the data DATA from the read sensor 101 has a value larger than the threshold value. A detection signal is generated when three pixels continue in the main scanning direction. The counter 413 is an OR circuit 414.
Pixels in the main scanning direction are counted by counting the clock CLOCK input through the AND circuit 4.
When the detection signal from 12 is input to the OR circuit 414, the counter 413 is masked and stopped, and the value of the counter 413 is notified to the microcomputer in the IPU 103.

In this reading for detecting the end portion of the main document in the main scanning direction, the reading sensor 101 is performed in the front direction from the black main document table 1 on the back side or the outer frame portion thereof, and the main document BO is read in the same manner as described above. Occurrence of page background is detected. In the detection of the end portion of the main document in the main scanning direction, the microcomputer in the IPU 103 does not control the scanning of the scanning unit 200, so that the processing time is long and the scanning unit 20 for adsorbing the page is detected.
This is performed when the scanning of 0 is stopped, and the microcomputer in the IPU 103 causes the data latch circuit 408 and the D flip-flop circuits 410 and 411 to detect the end portion of the main scanning direction of the original.
Also, the reset signal RESET to the counter 413 is released.

The microcomputer in the IPU 103 uses the detection signal at the end of the main document in the main scanning direction to determine the effective image range in the main scanning direction of the main document having a relatively large irregular size. The outside image is automatically erased to prevent useless black solid images. When applied to a file system or the like, the image data is reduced by the detection signal at the end portion of the main document in the main scanning direction to save the memory amount.

Next, the detection of the trailing edge of the original document in the sub-scanning direction by the page storage sensor will be described. For detection of the end portion of the page of the original document after the first page turning, the end position of the uppermost page of the two-page spread original document is accurately and stably calculated by using the transmissive page storage sensor in the page turning path. This device uses the cover of the manuscript as the manuscript table 1
Since it is fixed at, there is little deviation when scanning this document. Further, this document has a tendency that the displacement of the position due to turning one page is extremely small.

This apparatus uses a transmissive page storage sensor 415 for page detection as shown in FIG. The transmissive page storage sensor 415 includes a light emitting diode 415a as a light emitting element on the upper page conveyance guide 416, and a photodiode 415b as a light receiving element below the lower page conveyance guide 417.
It is configured to include. Holes 416a and 417 are formed in the page conveyance guides 416 and 417 forming the page conveyance path 418.
a is provided, and the light emitting diode 415a and the photodiode 415b are arranged obliquely with respect to the vertical direction of the detection position of the page conveying unit, so that the paper dust generated by storing the turned pages of the document is detected by the page storage sensor 415. The structure is such that it does not accumulate at the page-turning detection position and falls downward.
The page storage sensor 415 detects the page turning of the original document conveyed through the page conveyance guides 416 and 417 after separating one page, and the detection accuracy is extremely high within 1 mm regardless of the original selected. The page storage sensor 415 is also used as a sensor for detecting a jam of unstored and undischarged pages when turning a page.

The scanning unit 200 shown in FIG. 27, after reading the double-spread original document BO, is scanned in the left direction to turn the page of the original document BO. The turning page locus when turning pages of this manuscript is almost constant and mechanically determined. The uppermost right page end of the original document BO is attracted to the page-turning belt 208, the scanning of the scanning unit 200 is temporarily stopped, and the page-turning belt 208 is lifted to guide the page-turning page toward the page conveying path. The scanning unit 200 is further scanned in the left direction, the page to be turned is stored in the page conveying path, and the leading edge of the page goes out of the scanning unit 200. The locus of the flipping page rises and is almost constant along the flipping belt 200, and is determined by its mechanical layout. Page storage sensor 4
A turning page 15 is arranged in the vicinity of the entrance of the turning page storage portion formed by the page feeding path and detects the turning page of the original document.

As shown in FIG. 80, the microcomputer in the IPU 103 has a conveyance path sensor (page storage sensor).
The turning page storage start detection timing IN at which the turning page 415 detects the turning page, that is, the position of the scanning unit 200 at the turning page storage detection position of the turning page storage section, indicates the turning page when the turning page is on the original. Calculate the right edge position. Therefore, the page storage sensor 415 detects the edge of the page after separating one page of the original document,
The position of the page edge portion in the direction to start turning the spread document (on the right side in this apparatus) is accurately and reliably detected, and the output signal of the page storage sensor 415 (page storage start detection timing OUT).
From this, the microcomputer in the IPU 103 calculates and corrects the trailing edge of the image effective range of the main document and the next page-turning position (since the position of the page is extremely small due to the turning of one page).

The control of the page suction position (page turning position) based on the above calculation result is performed as follows. In this apparatus, the page suction width when the turning belt 208 comes into contact with the right end of the page of the original and lifts the page is about 20 mm. When the detection timing of storing the original page in the turning page storage section is earlier than the target timing, the suction width is larger than the target 20 mm. The suction and rise timings of 208 are displaced in the early direction. For example, the microcomputer in the IPU 103 estimates the suction width to be 22 mm when the timing of detecting the original page turning page storage in the turning page storage section is 2 mm ahead of the distance, and scans the next page suction position by the turning belt 208 by 2 mm. The address of the unit 200 is changed to the right side.

On the other hand, the microcomputer in the IPU 103 turns the turning belt 2 when the original document turning page storage detection timing of the turning page storage section is later than the target timing.
Since the suction width of 08 is smaller than the target of 20 mm, the page-turning belt 208 of the page end portion in the turning-start direction of the double-page spread original document
The suction and rise timings due to are displaced in the slower direction.
As a result, the page suction width is controlled to a constant value, and it is possible to prevent a failure of turning over, turning mistakes of turning a large number of sheets, and damage to the original document, and a stable repeated operation is performed.

Next, the detection of the leading edge of the original document in the sub-scanning direction by the page storage sensor will be described. When the scanning unit 200 is further scanned in the left direction after the turning pages are stored in the turning pages storage section, the two-page spread original document has the turning pages constrained by the central binding section, so that the turning pages are pulled by the binding sections. The paper is discharged in a U-shaped path from the page-turning conveyance path. The trail of ejecting the page-turning is always substantially constant along the page-turning path and the pressing roller 281a. IPU1
The microcomputer in the reference numeral 03 indicates a turning page from the position of the scanning unit 200 at the timing of detecting the start of discharging the original page turning page in the turning page storage section by the page storage sensor 415, that is, the position of the scanning unit 200 at the timing of detecting the starting turning page discharge start of the turning page storage section. Calculates the right end position which should be on the upper left of this document from the output signal of the page storage sensor 415 (see FIG. 80). Therefore, the page end position of the double-page spread original in the turning start direction (on the left side in the present apparatus) is accurately and surely detected by turning one page of the original manuscript and then detecting the page end, and the IPU 103 The microcomputer inside calculates the leading edge of the effective image range of the original document from the position of the page edge in the turning start direction of the two-page spread original document, and uses it for the next reading registration.

The microcomputer in the IPU 103 has a start position address A and an end position address B of the effective image range between the detected right and left ends of the original document.
As a result, the center position becomes the binding portion of the double-page spread of the original document, so the center binding portion address C is calculated as follows. C = (A + B) / 2 Thus, the reference position for page allocation when copying the double-page spread original document image read at one time can be obtained. Further, since the image of the central binding portion of the two-page spread original document is likely to be shaded or distorted,
The microcomputer in U103 surely erases the image at that position. Further, the microcomputer in the IPU 103 performs the right page registration at the time of page independent output by using the calculated center binding portion address C.

As described above, the displacement of the uppermost double-page spread position due to repeated page-turning of the double-page spread original document is extremely small when turning one page. Further, the positional deviation of the position of the top spread page due to repeated turning of 10 pages is 1 mm or less, and the deviation of the image position (copy resist) is small.
Therefore, the microcomputer in the IPU 103 calculates the page suction position of the original document by repeating the page-turning scanning a plurality of times, for example, once for every page-turning operation of 10 pages, and updating the position data to obtain the original document. The calculation processing and time for the page edge are reduced.

Next, the input of the original document edge portion (page turning position) will be described. As described above, in the first page turning, the right edge portion of the two-page spread original document is detected based on the read data in the image reading method. However, there are rare cases where the page edge portion of a book document such as a gravure book is not detected or is erroneously detected. It is performed without turning the page into the turning page conveyance path during the turning page, and as a cause thereof, the page turning position is defective, specifically, the page suction width is too small, or the page sticks out of the suction belt 208. Some cannot be raised, and some cannot pick up pages depending on the paper type of this document. In the former case, if the page suction width is set correctly, the page is surely turned.

As shown in FIG. 64, the present apparatus is provided with a scale 419 for inputting the right page edge portion on the exterior portion on the right front side of the document table 1. The scale 419 is provided in parallel with the sub-scanning direction and is graduated at equal intervals. If the device is stopped due to page turning for the first time, "
A guide display "Page Migihashi no Scale" is displayed, and the operator opens the scanner unit and reads the value at the right end of the page on the scale 419 at the right end of the page.
Input with the ten keys of the operation unit 99. In the example of FIG. 64,
Enter the scale value "12" at the right edge of the top page,
Then, the enter key of the operation unit 99 is used to make a confirmation input. After that, by pressing the print key of the operation unit 99, I
Similarly, the microcomputer in the PU 103 starts the reading scan, and this time, the page suction / raising position is calculated from the input position information at the right end of the page, and the turning belt 208 sucks / raises the glue at this position. as a result,
The page turning is started with an appropriate suction width regardless of the type of page image of the original document. After that, IPU1 is the second and subsequent page turn.
In the same way as described above, the microcomputer in 03 controls the page storage sensor 415 at the timing calculated by the page right end detection position.

Next, the page turning position input method will be described. In this example, the scale 41 is used to input the end position of the document.
I tried to input the numerical value of 9 with the numeric keypad, but other first
In the above example, a slide volume for aligning the end portion of the original document is provided at the same position as the scale 419 for inputting the end portion of the right page of the exterior portion on the right front side of the document table 1, and the resistance value or the converted voltage value is stored in the IPU 103. I read it with a microcomputer.

In another second example, the scanning unit 2
00, a sensor is provided, and a shield plate detected by the sensor is provided laterally slidable at the same position as the scale 419 for inputting the right page end portion on the exterior portion on the right front side of the document table 1. The shield plate is aligned with the position of the end portion of the original document, and is detected by the sensor during scanning of the scanning unit 200 to be the timing of page suction rise. In this case, the position of the sensor and the shield plate may be reversed and the sensor may be slidable.

In another third example, the read sensor 101
The read image data of is used. Reading sensor 1
01 reads from the front side in the main scanning direction, and the projection position of the read pixel in the main scanning direction to the start position is set on the document table 1
The optical system is arranged so as to hang on the exterior portion on the front side of the.
At the same position as the scale 419, a slidable white mark member having a clear contrast with the black color of the exterior is arranged, and the mark at a fixed position in the main scanning direction is read by the reading sensor 101 at the time of scanning reading and the reading sensor 101. A mark is detected by the mark detection circuit similar to the document edge detection circuit shown in FIG.
The microcomputer in the PU 103 controls the page suction position by calculating the timing (position) of page suction and ascent based on the data from the mark detection circuit.

The main document sub-scanning direction end detection circuit and the main document main scanning direction end detection circuit are arranged in the IPU 103 to sample the pixel data before the image scaling processing in the main scanning direction to detect the sub-copy of the main document. The end in the scanning direction and the end in the main scanning direction are detected, and the start and end of the detection are instructed by the microcomputer in the IPU 103. The end of the main document in the sub-scanning direction detected by the end detection circuit of the main document is managed by the scanning position of the scanning unit 200 by the microcomputer in the IPU 103, and the microcomputer in the IPU 103 counts the pixels in the main scanning direction. The counter controls the main document main scanning direction end detected by the main document main scanning direction end detection circuit. And IP
The microcomputer in U103 calculates the page suction position and the effective image range in the main scanning direction by the end portion of the main document in the sub-scanning direction and the end portion of the main document in the main scanning direction.

Next, the operation of this system will be described. TPS operation mode (1) Reading mode (a) Main document reading When the sub first mirror 222 is released, the lower fluorescent lamp 201,
202 is turned on, the carriage 200 is scanned rightward after the shading correction at the left home position, the two-page spread original document is read at once, and the image data thereof is stored in the frame memory 104.

(B) Sheet document reading The upper first fluorescent lamp 203, when the sub first mirror 222 is inserted,
204 is turned on, the carriage 200 is scanned rightward after shading correction at the left home position, the sheet original is read, and the image data is read by the frame memory 1.
It is stored in 04.

(2) Return mode (a) Page turning In this original reading mode, the high voltage bias is applied to the high voltage power source 1
16 is applied to the turning belt 208, and the carriage 2
00 is scanned in the left direction and the turning roller 208 stops at the time when it reaches the right end of the two-page spread document, and the turning roller 2
08 increased to 0.5 sec. The carriage 200 is then scanned leftward. The edge detection circuit detects the right edge and the left edge of the two-page spread original from the image data from the VPU 102, and the microcomputer in the IPU 103 uses them and the output signals of the page storage sensor 415 to detect the page suction position and the main scan of the read image. The effective image range of the direction is calculated.

(B) Unit Return In the sheet original reading mode, the carriage 200 is scanned leftward. (3) Homing Mode When the power is turned on, the carriage 200 is scanned and set to the central home position, and the document table 1 is raised and then lowered by a certain amount and retracted from the carriage 200.

(4) Pre-scanning mode The carriage 200 is scanned to the left home position to prepare for shading correction and reading start. (5) Post-scan mode After the return operation of the carriage 200 ends, the carriage 200
Is scanned and set to the central home position, and the document table 1 is raised and then lowered by a certain amount and retracted from the carriage 200.

Next, the basic operation of TPS will be described in detail. (1) Main document reading mode (a) The main document reading mode is designated by pressing the BOOK key on the operation unit 99. (B) When the print key of the operation unit 99 is pressed, the document table 1 is raised, and the document is abutted and fixed on the carriage 200.

(C) The sub first mirror 222 is released,
The lower fluorescent lamps 201 and 202 are turned on. (D) The carriage 200 is scanned leftward, and after reaching the left home position, shading correction and AGC are performed. (E) The carriage 200 is scanned rightward to read the image of the two-page spread original document, and the image-processed data is stored in the frame memory 104.

(F) After the carriage 200 has been scanned to the far right, charging of the turning belt 208 is started,
The carriage 200 is scanned leftward. (G) The carriage 200 is scanned in the left direction to read the image of the original document, and the microcomputer in the IPU 103 detects the right end portion of the original document from the density difference between the document table 1 and the original document page based on the image data from the VPU 102. . (H) The microcomputer in the IPU 103 temporarily stops the carriage 200 when the turning belt 208 reaches the detected right end portion of the original document, then raises the turning belt 200, and after a certain period of time, moves the carriage 200 leftward. To scan.

(I) The microcomputer in the IPU 103 calculates the main scanning direction range of the main document based on the upper end portion of the main document page detected by the main document main scanning direction end detection circuit when the carriage 200 is temporarily stopped, and moves up and down. Direction automatic erase position is calculated, and then the lower fluorescent lamps 201, 201
Turn off 02. (J) The microcomputer in the IPU 103 scans the carriage 200 in the left direction after a predetermined time elapses after the page suction of the turning belt 200 rises. (K) The page storage sensor 415 detects the page stored in the page-turning conveyance path, the microcomputer in the IPU 103 accurately calculates the page right end position from the page storage start detection timing (position), and Detect turning over.

(L) At the point where the carriage 200 reaches the central position, the left and right fixing of the left and right book manuscript tables 1 and the left and right fixation of the right book manuscript table 1 are once released, and the book spread shape is determined. (M) When the turning belt 208 reaches the central point of this document, the charging of the turning belt 208 is stopped. (N) The carriage 200 is scanned to the left, the page storage sensor 415 detects the discharge of the page stored in the page-turning path, and the microcomputer in the IPU 103 detects the page discharge start timing (position) to the left end of the page. The position of the copy is accurately calculated, and the center position of the double-page spread original and the length of the double-page spread are calculated from the calculated left and right end positions of the page.

(O) After the completion of the calculation, the microcomputer in the IPU 103 designates the address of the frame memory 104 by the left and right end portions of the page, the image output form, and the erase position, and the frame memory 104 is designated by the synchronizing signal from the printer. The image data is read from the designated address of and transferred to the printer.

(P) After the carriage 200 reaches the left home position, the lower fluorescent lamps 201 and 202 are turned on,
Shading correction and AGC are performed.

(Q) The carriage 200 is scanned in the right direction, the image of the two-page spread original document is read, and the image-processed data is stored in the frame memory 104. (R) The lower side fluorescent lamp 2 is read by reading up to the right end of this document.
01 and 202 are extinguished, and immediately after the data is stored in the frame memory 104, the microcomputer in the IPU 103 specifies the address of the frame memory 104 by the positions of the left and right edges of the page and the image output form detected, and the erase position, Image data is read from a designated address of the frame memory 104 by a synchronization signal from the printer and transferred to the printer.

(S) and below, during continuous operation, (f),
(H), (j) to (n) page turning, and (p) to (r) reading are repeated. It should be noted that after the second time, (g), (i) edge image detection, and (o) printout after page turning is not performed. (T) For the end of the continuous operation, after the carriage 200 of (p) reaches the left home position, the carriage 200 is scanned rightward and stopped at the center home position.

(2) Sheet original reading mode (a) The sheet reading mode is designated by pressing the BOOK key.

(B) When the print key is pressed, the document table 1 is lowered and the document table 1 is retracted from the carriage. (C) The sub first mirror 222 is inserted, and the upper fluorescent lamp 2
03 and 204 are turned on. (D) After the carriage 200 is scanned leftward and reaches the left home position, the upper fluorescent lamps 203 and 204 are turned on, and shading correction and AGC are performed.

(E) The carriage 200 is scanned rightward to read the sheet original, and the image-processed data is stored in the frame memory 104. (F) After the carriage 200 is scanned to a position determined by the transfer paper size and the scaling factor, the upper fluorescent lamps 203 and 204 are turned off and the carriage 200 is scanned leftward.
(G) Immediately after the data has been stored in the frame memory 104, the data is read from the designated address of the frame memory 104 by the synchronizing signal from the printer and transferred.

(H) After that, during continuous operation, reading and returning from (d) to (g), and writing and reading in the frame memory 104 are repeated. (I) To end the continuous operation, after the carriage 200 of (d) reaches the left home position, the carriage 200 is scanned rightward and stopped at the center home position.

Next, the selection of the image reference will be described.
67 and 68 show a part of the operation unit 99 of this apparatus.
The operation unit 99 has an operation button 601 for switching and designating a sheet original reading mode and a book original (main original) reading mode. In the main original reading mode, the following modes are effective. The operation unit 99 is provided with an image reference designation key 602 for designating an image reference mode at the time of copying this document, and light emitting diodes 603, 604 for displaying the state. The image reference position includes the center of the sheet (transfer sheet), the left edge of the sheet, and the right edge of the sheet. When the image reference designation key 602 is pressed, the image reference mode is sequentially changed to the center, left edge, and right edge of the transfer sheet. Upon switching, the light emitting diode 603 lights in the image reference mode in which the image reference position is the left end of the paper, and the light emitting diode 604 lights in the image reference mode in which the image reference position is the right end of the paper. The basic image reference mode in which the image reference position is the center of the paper is not displayed.

As shown in FIG. 83, when the power is turned on, the main control plate 107 sets the reference key counter to 1 so that the image reference position is the center of the sheet, and the light emitting diodes 603 and 6 are provided.
Turn off 04. Further, the main control board 107 increments the reference key counter each time the image reference designation key 602 is turned on, and sets 1 to the reference key counter when the reference key counter becomes 4 or more. Then, when the reference key counter is 1, the main control plate 107 sets the image reference position as the center of the paper and the light emitting diodes 603 and 604.
Is turned off, and when the reference key counter is 2, the light emitting diode 60 is used as the image reference position at the left end (left alignment) of the transfer paper.
When 3 is turned on and the reference key counter is 3, the image reference position is set to the right end (right alignment) of the transfer paper and the light emitting diode 6
Turn on 04.

At the time of default such as power-on, mode clear, main document reading mode selection, etc., the basic image reference mode with the image reference position as the center of the paper is preferentially selected by the main control board 107. This prevents image loss when an image reference mode other than the basic image reference mode is preferentially selected and an error in transfer paper size detection or a registration (position) deviation of the image formation itself occurs. At the same time, the image position shift amount is made inconspicuous without forming an image on the edge of the transfer paper. Further, when the double-sided copy mode in which images are formed on both sides of the transfer paper is selected, the image reference mode in which the image reference position is the left end or the right end of the paper is preferentially selected by the main control board 107, and is standardized on the transfer paper. Create margins for binding.

The operation unit 99 also includes movement amount setting keys 605 and 606 for setting the amount of movement of the image position from the image reference position at the time of copying the original document, and light emitting diodes 607 and 608 for displaying the state. . There are left reference shift and right reference shift for setting the image movement amount, and the image movement amount setting is effective only when the image reference mode is the image reference mode in which the image reference position is at the left edge or right edge of the sheet (FIG. 81). The image is formed on the transfer paper by shifting from the image reference position. The image movement amount is 0 to 20 m depending on the numeric keypad input and the enter key input on the operation unit 99.
m can be set in units of 1 mm, and the default setting value of the image movement amount is 0 mm.

Further, the operation section 99 selects an operation button 609 for selecting whether to copy an independent page or a spread page of the original document.
And light emitting diodes 610 and 611 for displaying the state
Each time the operation button 609 is pressed, the main control plate 107 alternately selects and sets a mode for copying an independent page of the original document and a mode for copying a double-page spread. In addition, the operation unit 99 is an original (one sheet of this original) double-sided copy mode,
The two-page spread double-sided copy mode and the automatic double-sided copy mode are selectively operated, and the operation buttons 612 are provided. A mode for performing double-sided copying (one sheet of this document), a mode for performing double-sided copying of spread pages, and these two modes are automatically set so that the images of each page of this document are formed from the front side of the first sheet. Mode is set sequentially to perform double-sided copying. Further, the operation section 99 operates buttons 616 and 617 for selecting whether to copy the original document from the left page or the right page.
The main control plate 107 selectively sets a mode in which the main document is copied from the left page and a mode in which the main document is copied from the right page in response to depression of the operation buttons 616 and 617.

Next, the original document image standard will be described.
69 shows the page image range of the read spread book document, FIGS. 70 to 73 show the layout of page images in each book document image reference mode, and FIG. 84 shows the image reference mode processing flow of the main control plate 107. FIG. 69 shows an example in which the vicinity of the center of a main document having an A4 size cover and a main thickness of about 30 mm is opened. The page length in the plane direction from the page edge portion to the central binding portion of this document is reduced to about 200 mm. Generally, the pages of a two-page spread original document do not have a standard size even if the paper is of a standard size because the image is shrunk by the binding portion. The amount of image shrinkage varies depending on the thickness of the original document and the binding method thereof. Further, many of the originals have papers of a size other than the standard size. Further, there is a case where the original is out of the standard size by cutting the end portion after bookbinding.

70 (a) to 70 (c) show sheet images in the two-page spread original copy mode. The image reference positions in the two-page spread original copy mode are the left edge of the sheet, the center of the sheet, and the right edge of the sheet. As shown in FIG. 70A, when the image reference position is at the left end of the sheet, the page end position in the scanning start direction of the double-page spread original document is detected, and the microcomputer of the IPU 103 detects the left end position of the page and the laser printer. By performing a read address operation of the frame memory 104 based on the length information of the fed transfer sheet (transfer sheet length information from the transfer sheet size detecting means or the like), the left end portion of the original document is located at the leading end position in the transfer sheet transport direction. The images of both double-page spreads of this document are formed on one sheet of transfer paper in accordance with the above, so that the images of both double-page spreads are left-justified on the transfer paper and are formed in the same manner as in a conventional scale-based copying machine. It

When the image reference position is at the center of the sheet as shown in FIG. 70B, both page end positions in the scanning start direction and the scanning end direction of the two-page spread original document are detected as described above, and the IP
Scanning length information of the double-page spread original document calculated from the detection position by the microcomputer U103 and length information of the transfer paper fed by the laser printer (transfer paper length information from the transfer paper size detection means) To frame memory 1
By operating the read address 04, the two-page spread image of the original document is formed at the center of the transfer paper. Therefore, a uniform margin can be formed on the left and right of the transfer paper due to the shrinkage of the original.

As shown in FIG. 70C, when the image reference position is at the right end of the paper, the page end position in the scanning end direction of the two-page spread original document is detected as described above, and the microcomputer of the IPU 103 detects it. By operating the read address of the frame memory 104 based on the page edge position and the length information of the transfer sheet fed by the laser printer (transfer sheet length information from the transfer sheet size detecting means). The right end detection position is aligned with the rear end position of the transfer paper in the transport direction, and both spread pages of the original are formed on one transfer paper. As a result, the images of both double-page spreads are formed right-justified on the transfer paper, a margin is formed on the left side of the transfer paper due to the contraction of the document, and a binding margin when the transfer paper after copying is left-binding is possible.

71 (a) to 71 (d) show sheet images in the independent page copy mode. The image reference positions in the independent page copy mode for copying the image of each page of the original document onto the transfer paper are the left end of the paper, the center of the paper, the right end of the paper, both ends of the page, and the center of the page. However, in this apparatus, the designation means at both ends of the page and the center of the page are not shown. When the image reference position is at the left edge of the sheet as shown in FIG. 71A, the page edge positions of the left page and the right page of the two-page spread original document are detected and the center binding position is calculated as described above, and the IPU 103 Of the frame memory 104 from the position of the page edge of the left page and the position of the central binding part.
By manipulating the read address of, the page end position of the left page in the scanning start direction of the two-page spread original is aligned with the leading end position of the first transfer sheet in the conveyance direction, and the center binding position is the conveyance of the second transfer sheet. Aligned with the leading end position in the direction, both spread pages of this document are formed on independent transfer sheets. Further, the images of the respective pages are formed on the respective transfer papers in the left-justified manner as in the conventional scale-based copying machine.

As shown in FIG. 71 (b), when the image reference position is the paper center reference, the page edge positions of the left page and right page of the two-page spread original document are detected and the center binding position is set as described above. The microcomputer of the IPU 103 calculates a frame memory from the page edge position and the center binding position and the length information of the transfer paper fed by the laser printer (transfer paper length information from the transfer paper size detecting means). By manipulating the read address of 104, the page end position and the center binding position of the left page in the scanning start direction of the two-page spread original are aligned with the both ends of the first transfer sheet, and the center binding position and the right page are aligned. The end positions of the pages are aligned with both ends of the second transfer sheet, and both spread pages of the original are formed at the centers of the independent transfer sheets. Therefore, a uniform margin can be formed on the left and right sides of the transfer sheet due to the contraction of the document.

As shown in FIG. 71 (c), when the image reference position is the right end reference of the paper, the page end positions of the left and right pages of the two-page spread original document are detected and the position of the center binding part is determined as described above. The microcomputer of the IPU 103 calculates the page end position and the center binding position of the right page, and the length information of the transfer sheet fed by the laser printer (transfer sheet length information from the transfer sheet size detecting means). By operating the read address of the frame memory 104, the center binding position of the double-page spread original in the scanning start direction is aligned with the rear end of the first transfer sheet, and the page end position of the right page is transferred to the second transfer. The image of each page is formed right-justified on the transfer paper in alignment with the rear end position of the paper in the transport direction. As a result, a blank space is formed on the left side of the transfer paper due to the contraction of the original, and a binding margin is created when the copied transfer paper is left-bound or bound.

As shown in FIG. 71 (d), when the image reference positions are at both ends of the page, copying is performed by switching the image reference positions on the left and right pages of the sheet to the left edge and right edge of the paper, as in the above case. Both double-page spreads of the original document are formed on both end sides of the independent transfer paper, and a margin is formed on the central side of the transfer paper due to the contraction of the original document. When the image reference position is at the center of the page as shown in FIG. 71 (e), copying is performed by switching the image reference positions on the right and left sides of the sheet to the right edge and the left edge of the sheet in the same manner as described above, that is, , The central binding portion position of the double-page spread original document is calculated as described above, and the microcomputer of the IPU 103 determines the central binding portion position of the double-page spread original document by the calculated central binding portion position of the double-page spread original document. The two-page spread images of the original document are formed on two independent transfer sheets in accordance with the rear end position in the transfer direction and the front end position in the transfer direction of the second transfer sheet. Therefore, both double-page spreads of the original document are formed on the center side of the independent transfer paper, and margins are formed on both end sides of the transfer paper due to the contraction of the document.

72 (a) to 72 (d) show sheet images in the double-sided spread copy mode. The image reference in the double-sided spread copy mode is the front / right edge of the paper / back / left edge of the paper, and the center of the paper. As shown in FIG. 72A, when the image reference is the sheet front / right edge / back of the sheet / left edge, the microcomputer of the IPU 103 causes the page length of the original document in the scanning direction and the transfer sheet length information (transfer sheet size detection means). By manipulating the read address of the frame memory 104 based on the transfer paper length information), the image reference position on the front surface of the transfer paper is set as the trailing edge of the paper in the scanning direction, and the image reference position on the back surface of the transfer paper is set. Since images are formed on both sides of the transfer sheet as the leading edge of the sheet in the reading scanning direction, the images on the front and back sides of the transfer sheet are shifted to one side, and the binding margin when binding the transfer sheet for double-sided image formation can be achieved by the page image shrinkage.

When the image reference is the paper center reference as shown in FIG. 72B, the transfer paper of the transfer paper is set in the same manner as when the image reference position is set to the paper center in the spread copy mode as shown in FIG. 70B. Images are formed on the front and back. Fig. 73 (a)-
(C) shows a paper image in the double-sided independent page copy mode. The image reference in the double-sided independent page copy mode includes paper front / right edge / paper back / left edge and paper center. If the image reference is the front / right edge of the paper / back of the paper / left edge reference, A. When the image is formed on the front and back of the transfer paper in the same manner as the original, B. In some cases, an image may be formed on the front and back of the transfer paper, which is the reverse of the original.

In the former A, the microcomputer of the IPU 103 causes the right end of the page of the double-page spread and the left end of the page of the left page and the transfer sheet length information (transfer sheet length information from the transfer sheet size detecting means) of the original document. By operating the read address of the frame memory 104 from, the right edge of the page of the double-page spread right page of this document is aligned with the rear edge position of the transfer sheet as shown in FIG. Formed on the surface,
The left edge of the double-page spread left page of this document is aligned with the leading edge of the transfer paper, and the image of the left page is formed on the back side of the transfer paper. Is formed.

In the latter B, as shown in FIG. 73 (b), in the latter B, the microcomputer of the IPU 103 forms a frame based on the central binding portion of the original document and the transfer paper length information (transfer paper length information from the transfer paper size detecting means). By manipulating the read address of the memory 104, the central binding portion of the original document is aligned with the rear end position of the transfer sheet to form an image on the surface of the transfer sheet, and the central binding portion of the original document is positioned at the leading end position of the transfer sheet. By forming an image on the back surface of the transfer paper in alignment with each other, an image of the double-page spread of the original document is formed on the front and back surfaces of the transfer paper. In this case, the transfer sheet can have a large binding margin width based on the binding portion.

When the image reference is the sheet center reference as shown in FIG. 73C, the transfer sheet is the same as when the image reference position is the sheet center in the independent page copy mode as shown in FIG. 71B. An image is formed on the front and back of the. In this apparatus, when the set image reference position is the edge (leading edge or trailing edge) of the transfer paper, that is, the left edge of the paper, the right edge of the paper, the image reference is the front / right edge of the paper / back of the paper / left edge. Same as the original, the standard mode is to form images on the front and back of the transfer paper, and the image reference position when forming images on the front and back of the transfer paper is switched to the trailing edge and the leading edge of the transfer paper in the scanning direction. Images are formed on both sides of the paper.

Next, the operation timing of the original document will be described. FIG. 74 shows the copy operation timing in the main document copy mode of this apparatus. In this main document copy mode, the end portion of the main document is detected by the image in the initial mode from the press of the print key. The page size of this manuscript in each mode is A4
The scanning unit 20 has a size of 2 pages and a 2-page spread of this document.
0 is continuously read by one scan, and the read data of A3 size is stored in the frame memory 104,
Data is read from the frame memory 1104 according to each output mode, imaged by a laser printer, and recorded on transfer paper.

FIG. 74 shows the copy operation timing in the 1TO1 copy mode in which a two-page spread A3 size original document image is copied onto an A3 size transfer sheet and one copy is made of the original document. At the copy operation timing in this 1TO1 copy mode, the microcomputer in the IPU 103 turns the scanner motor 106, which scans the scanning unit 200, in the reverse direction via the motor drive circuit 503 when the print key for instructing the start of copying is turned on. The scanning unit 200 at the center is moved in the reading start direction. When the scanning unit 200 moves to the reading start position of the left home position, the microcomputer in the IPU 103 drives the scanner motor 106 in the normal rotation direction to turn on the fluorescent lamps 201 and 202 to start the reading scanning of the original document BO. Let

The microcomputer in the IPU 103 processes the image data from the VPU 102 as an original image from the end point of the left page of the original document and generates an effective image area signal SFGATE in the reading sub-scanning direction. Then, the microcomputer in the IPU 103 uses the effective image area signal SFGATE to transmit the frame memory 104.
The data write signal memory W is operated to control the data write range. Further, the microcomputer in the IPU 103 recognizes the center point of the double-page spread original binding portion from the control address of the scanner motor 106, and determines the reference position of the second image in the independent page copy mode or the read image in the double-page spread mode. It is used when, for example, is formed in the center of the transfer paper.

When the scanning unit 200 reaches the right page edge portion of the spread original document, the microcomputer in the IPU 103 detects the right page edge portion of the original document and detects the page storage sensor 415.
Starting from the output signal of, the page suction position at the time of page turning is calculated from the detected right page edge portion. Scanning unit 200
When the reading scan is completed, the page turning scan for the backward movement is started, and as described above, the microcomputer in the IPU 103 first determines the effective image range according to the page storage position from the output signal of the page storage sensor 415 as described above. The image data of the image effective range is read from 104 and sent to the printer to start image formation.

That is, the microcomputer in the IPU 103 determines, based on the output signal of the page storage sensor 415, from the scanning position of the scanning unit 200 at the time when the storage of the page is detected to detect the turning page storage form of the apparatus. Calculate the top right edge position. And IPU103
The microcomputer therein calculates the left end position of the turning page on the main document from the turning page discharge shape of the apparatus from the scanning position of the scanning unit 200 at the time of detecting the turning page discharge based on the output signal of the page storage sensor 415. .

In addition, the microcomputer in the IPU 103, after the second time, within the effective image area calculated from the page storage position detected based on the output signal of the page storage sensor 415 the last time, reads the frame memory 10 immediately after the end of scanning.
The image data is read from 4 and sent to the printer to cause the printer to start image formation. The microcomputer in the IPU 103 uses the effective image area signal PFGATE in the sub-scanning direction on the printer side to send the frame memory 104.
The data read signal memory R is operated to read the image data in the image effective range from the frame memory 104 in synchronization with the printer and send it to the printer to form an image. Further, when the page is turned, the page storage sensor 415 repeatedly detects the page edge of the two-page spread original. By repeating the above steps, the double-page spread is copied while automatically turning the pages of the original.

This apparatus performs a stable page turning operation against the page suction / separation method by the displacement of the suction roller of this document.
In this method, only the leading end of the page is sucked and displaced upward and guided to the page storage portion, so the suction position is important. As described above, the page edge portion of the original document is detected, the operation position of suction and separation with respect to the edge portion of the original document that changes due to repeated page turning is determined, and control is performed so that the designated width of the page is absorbed and separated.

Next, the image range of the original document will be described. The reading sub-scanning direction range of the original document image and the arrangement method thereof will be described with reference to the time charts of FIGS. 75 to 78. 75 to 78, the reading range and the image forming range in the sub-scanning direction are indicated by the number of scanning lines, and the image position thereof is indicated.

As described above, the present apparatus reads both pages of a two-page spread original in one scan, stores the image data in the frame memory 104, then reads the image data from the frame memory 104, and the printer prints the image. Form. In this apparatus, the range in which the read image data in the sub-scanning direction is stored in the frame memory 104 (determined by SFGATE) is about 455 mm from the capacity of the frame memory 104 for the maximum allowable size A3 of this document of 420 mm, which is 7 mm.
There are 174 lines. Normally, since the page position of the two-page spread original document changes as described above, the range for accumulating the read image data in the sub-scanning direction of the apparatus in the frame memory 104 starts from the left end of the left original platen of the maximum size of the original document.

In the two-page spread original copy mode of FIG. 75, the effective image range (determined by VFGATE) of the two-page spread page of the cover size A4 is compared with the read image data storage range of the frame memory 104 according to the edge detection result of the two-page spread original. The positional relationship is as shown in the figure. The microcomputer in the IPU 103 spreads the VFGATE and, based on the detection result of the edge of the original document, shrinks the binding portion of the original document to A.
It is calculated as 6400 lines for 6614 lines of 3 sizes. PFGATE 1, 2 and 3 are examples of PFGATE indicating the effective image range of the transfer paper when the image data within the calculated effective range is read from the frame memory 104 and recorded on the transfer paper of A3 standard size by the printer.
The microcomputer in the IPU 103 is each PFGA
The TE range is determined by the size of the transfer paper fed by the printer, and is 6614 lines for A3 size. The printer uses the rising edge of PFGATE as a trigger to turn on the registration clutch of the paper feed, and sends the transfer paper from the paper feeding device by the registration rollers to form an image so that the leading edge of the image at the rising edge of PFGATE and the leading edge of the transfer paper are aligned. . The microcomputer in the IPU 103 is a VF
FH of white data is transmitted to the printer with each image data outside the GATE range as a margin.

PFGATE1 is PFGATE in the mode in which the image reference position is the left end of the paper, and IPU10
The microcomputer in 3 is a frame memory 104
From the printer to the printer so that the left end of the page of the original document is aligned with the front end of the transfer paper and a margin is formed at the rear end of the transfer paper. As the image layout in this case, the microcomputer in the IPU 103 determines that the page range (VFGATE) is 640 from the value of the counter that counts the number of image lines.
The image data after the end of 0 line is white.

PFGATE2 is a mode in which the image reference is the center of the sheet, and the microcomputer in the IPU 103 transfers the image data from the frame memory 104 to the printer so that the page center is aligned with the center of the transfer sheet and the front and rear edges of the transfer sheet are transferred. Send so that a uniform margin is created. In this case, as the image layout, the microcomputer in the IPU 103 calculates the difference 214 between the page range (VFGATE) 6400 lines and the transfer paper image range (PFGATE2) 6614 lines from the value of the counter that counts the number of image lines. VFGATE for half of the lines, 107 lines
It is provided as a blank area in front of the
A blank space is provided from the end point of line 0, and PFGATE2 ends at line 6614.

PFGATE3 is PFGATE in the mode in which the image reference is the right end of the paper, and the microcomputer in the IPU 103 transfers the image data from the frame memory 104 to the printer so that the left end of the page is aligned with the rear end of the transfer paper. Send so that a margin is created at the tip of. As the image layout, the microcomputer in the IPU 103 calculates a difference 51 between the page range (VFGATE) of 6400 lines and the transfer sheet image range (PFGATE2) of 6614 lines from the value of the counter that counts the number of image lines.
Four lines are provided in front of VFGATE as a blank area.

FIG. 76 shows the image range in the independent page copy mode, and FIGS. 81 and 82 show the independent page copy mode processing flow of the microcomputer in the IPU 103. Fig. 75
Similar to, the effective image range (V
FGATE) has a positional relationship as shown in the drawing with respect to the read image data storage range of the frame memory 104 based on the end detection result.

The microcomputer in the IPU 103 calculates the page length Q of the original document, calculates the residual width (P-Q) from the paper lengths P and Q from the transfer paper length detecting means, etc. When the reference position is the center of the sheet, the leading edge registration amount is set to (P−Q) / 2, and when the image reference position is the left edge of the sheet, the leading edge registration amount is set to the image reference position or the left side set by the operation unit 99. The left shift amount L corresponding to the shift amount is set, and when the image reference position is the right end of the sheet, the leading edge registration amount is set to the image reference position set by the operation unit 99 or the right shift amount R corresponding to the right shift amount (( (P-Q) difference (P-Q) -R. The microcomputer in the IPU 103 sets VFGATE to 6400 based on the contraction of the binding portion of the main document based on the detection result of the edge of the double-page spread original.
The line is calculated as one line, and one page is calculated as the half of 3200 lines, and the center binding portion position is calculated as the middle of the VFGATE range.

Further, in the mode in which the image reference is the left end of the paper, the microcomputer in the IPU 103 arranges the spread left-page image in the transfer paper image range {PFGATE1 (L)} of A4 size 3307 lines and sets the frame. The image data is sent from the memory 104 to the printer so that the left end portion of the left page is aligned with the front end of the transfer paper and a margin is formed at the rear end of the transfer paper. The image layout in this case is IPU
The microcomputer in 103 determines the page range (VFGATE) from the value of the counter that counts the number of image lines.
The image data after the end of 3200 lines, which is half of the above, is white. Further, the microcomputer in the IPU 103 is
The double-page spread right page image is arranged in the transfer paper image range {PFGATE1 (R)} of A4 size 3307 lines, and the image data is transferred from the frame memory 104 to the printer so that the binding position is aligned with the leading end of the second transfer paper. Send to the trailing edge as well to create a margin.

In the mode in which the image reference is the center of the sheet, the microcomputer in the IPU 103 arranges the spread page images in the transfer sheet image range {PFGATE2 (L), PFGATE2 (R)} of A4 size 3307 lines. Then, the image data is sent from the frame memory 104 to the printer so that the center of the page is aligned with the center of the transfer sheet and uniform margins are formed at the front and rear edges of the transfer sheet. As the image arrangement in this case, the microcomputer in the IPU 103 determines that the number of image lines is 3200 lines which is half of the page range (VFGATE) and 3307 lines of the transfer sheet image range (PFGATE2) from the value of the counter. 53 lines, which is half of the 107 lines of difference, are provided as a blank part before the page image, and the image data is sent from the frame memory 104 to the printer so that the PFGATE2 ends at 3307 lines with a blank part provided from the end point of 3200 lines.

In the mode in which the image reference is the right edge of the paper, the microcomputer in the IPU 103 arranges the spread left-page image in the transfer paper image area {PFGATE3 (L)} of A4 size 3307 lines and sets the frame memory 1
The image data is sent from 04 to the printer so that the page binding portion is aligned with the rear end of the transfer paper and a margin is formed at the front end of the transfer paper. In this case, as the image arrangement, the microcomputer in the IPU 103 uses the value of the counter that counts the number of image lines to determine 3200 lines of the page range (VFGATE) and 3 of the image range {PFGATE3 (L)} of the transfer paper.
A 107-line difference from the 307-line is provided as a margin before the VFGATE, and thereafter the image data on the left page of the VFGATE is read. Also, the microcomputer in the IPU 103 displays the spread right page image in A4 size 330.
Arranged in the 7-line transfer paper image range {PFGATE3 (R)}, the image data from the frame memory 104 to the printer is aligned with the right page end position at the rear end of the second transfer paper and the same as the front end of the transfer paper. Send so that margins are created. IP
The microcomputer in U103 is the main control pain 1.
In response to a data output command from 07, the leading edge white data is sent to the printer, the image data is read from the frame memory 104 with a delay of the leading edge registration amount, and the trailing edge white data is output to the printer.

In the double-sided / two-page spread copying mode shown in FIG. 77, the two-page spread image is arranged on both sides of the transfer paper as in the two-page spread copying mode shown in FIG. In this mode, when the image reference position is the edge of the sheet in the mode of forming images on both sides of the transfer sheet, the image reference position is formed by the front and back sides of the transfer sheet.
Transfer papers for double-sided copying are often bound, filed, or bound depending on the application. IPU
When the set image reference position of the transfer paper is at the edge (leading edge or rear edge) of the transfer paper as shown in FIG. 85, the microcomputer in 103 displays an image when forming an image on the front surface and the back surface of the transfer paper. The reference position is switched between the trailing edge and the leading edge of the transfer sheet in the scanning direction, and images are formed on both sides of the transfer sheet. When the image reference position is the edge of the paper, the image range corresponds to the front and back of the transfer paper and corresponds to the PFGATE front and back, and the microcomputer in the IPU 103 is shown in FIG.
PFGATE3 and PFGATE in double-page spread copy mode
By repeating the step 1, the image data is sent from the frame memory 104 to the printer preferentially so that the margin of the transfer sheet is moved to one side (the leading edge or the trailing edge) to form the binding margin.

On the other hand, when the image reference position is set to the center of the paper, the microcomputer in the IPU 103 is set to the one shown in FIG.
The image data is sent from the frame memory 104 to the printer so that images are formed on both sides of the transfer paper and margins are formed at both ends of the transfer paper, as in PFGATE2 in the double-page spread copy mode.

In the double-sided / independent page copy mode of FIG. 78, the images are arranged on both sides of the transfer paper page by page as in the independent-page copy mode of FIG. 76, and FIG. 86 shows the double-sided / independent page of the microcomputer in the IPU 103. The copy mode image reference selection flow is shown. When the image reference position is the edge of the sheet in the mode of forming images on both sides of the transfer sheet, this apparatus forms the reference for each of the front and back sides of the transfer sheet. When the set image reference position is an edge (front edge or rear edge) of the transfer paper and the original both sides or the spread both sides are copied, the microcomputer in the IPU 103 is configured to form an image on the front side and the back side of the transfer sheet. The image reference position is switched between the trailing edge and the leading edge of the transfer sheet in the scanning direction to form images on both sides of the transfer sheet, that is, the image data is transferred from the frame memory 104 to the printer on one side (leading edge or rear edge). The sheet is fed so that the binding margin portion is formed preferentially by being pushed to the end).

When copying both sides of the original, IP
The microcomputer in U103 forms an image on the transfer paper on the front and back sides in the same manner as the original, and the frame memory 104
Image data from the printer to the printer with the image reference position as the page edge and the right page of this document is the image range of the front of the transfer paper {PFGATE
(R → front)}, the left page is the image range on the back of the transfer paper {PFG
ATE (L → back)}, and the image range is PFGATE3 (R) and PFGATE1 in FIG.
It corresponds to (L). When binding with this transfer paper,
It is possible to obtain a book having the same positional relationship from the book original as the page edge.

When copying the two-page spread of the original document on the front and back sides of the transfer sheet, the microcomputer in the IPU 103 transfers the image data from the frame memory 104 to the printer with the image reference position as the page binding portion and the left page as the transfer sheet. The image range {PFGATE (L → front)} on the front side of the image is sent so that the right page is arranged in the image range {PFGATE (R → back)} on the back side of the transfer paper. This image range is PFGATE3 in FIG.
(L) and PFGATE1 (R).

On the other hand, when the image reference position is set to the center of the paper, the microcomputer in the IPU 103 is set to the one shown in FIG.
As in PFGATE2 in the double-page spread copy mode, images are formed on both sides of the transfer paper to form margins at both ends of the transfer paper.

As described above, the microcomputer in the IPU 103 controls the writing position of the transfer paper by the read address operation of the frame memory 104 in which the image data is once stored. Further, in all copy modes, the printer counts the timer triggered by the rising edge of each PFGATE, turns on the paper feed registration clutch, and forms an image by aligning the leading edge of the PFGATE signal with the leading edge of the transfer sheet. .

According to this apparatus, since the image information of the read original document is converted into image information having the set image reference position as the image reference position and is formed on the transfer sheet, the image of the original document is set at a desired position on the transfer sheet. Can be formed. Also, when the image reference position is set at the leading edge of the transfer paper in the scanning direction, it is possible to form an image on the transfer paper by aligning the transfer paper on the left side on the transfer paper in the same way as a conventional scale-based copying machine. When is set to the center of the transfer paper, uniform margins can be created on the left and right of the transfer paper due to the contraction of the original, and when the image reference position is set to the rear edge of the transfer paper, the right side of the transfer paper is shown due to the contraction of the original. Margins can be created by padding and used as a binding margin.

Further, by setting the default image reference position at the center of the transfer paper, it is possible to prevent the occurrence of image loss when an error in the transfer paper size detection or a registration (position) deviation of the image formation itself occurs. In addition, the image position shift amount can be made inconspicuous without forming an image on the edge of the transfer paper. In addition, by moving the spread book document read image information by a desired amount from the image reference position of the transfer sheet and forming it on the transfer sheet, the image of the book document can be formed at a desired position on the transfer sheet. It is possible to freely create a margin on paper and use this margin for binding processing and bookbinding processing.

Further, the moving amount of the transfer paper image reference position is variably set in millimeter units, and the two-page spread original document read image information is formed on the transfer paper by moving by the set moving amount from the image reference position of the transfer paper. By doing so, the image forming position on the transfer paper can be set finely, and the operator can easily understand the movement amount setting of the transfer paper image reference position, and finely adjust the movement amount of the transfer paper image reference position in millimeter units. be able to.

Also, the page end position in the scanning start direction of the double-page spread original document is detected, and the detected page edge position and the leading end position of the transfer paper in the conveying direction are aligned to transfer one double-page spread page of the original document. By forming the image on paper, the images on both spread pages of the original can be left-justified on the transfer paper to form an image in the same manner as in a conventional scale-based copying machine. Further, in general, even if the pages of a two-page spread original document have a standard size, the image is shrunk by the binding portion, and the page length of the two-page spread original document does not have the standard size. Moreover, many of these manuscripts are out of the standard size. Therefore, the page edge positions in the scanning start direction and the scanning end direction of the double-page spread original document are detected to obtain length information in the scanning direction of the double-page spread original document. By forming the two-page spread images of the original document in the center of the transfer paper based on the information, uniform margins are created on the left and right of the transfer paper due to the contraction of the original, and page size detection errors and registration (position) deviations of the image formation itself occur. It is possible to prevent the loss of the image in the case of occurrence of.

Further, the page end position of the two-page spread original in the scanning end direction is detected, and the page end position is detected by the detected page end position and the transfer paper length information after the transfer paper conveyance direction. By forming on one sheet of transfer paper according to the edge position, a right-justified margin on the transfer paper creates a blank space due to the contraction of the original,
A binding margin can be created when the transfer paper after image formation is left binding.

Further, the position of the page edge of the left page of the double-page spread original is aligned with the position of the leading edge of the first transfer sheet in the transport direction, and the position of the central binding portion of the double-page spread original is the edge of the second transfer sheet in the transport direction. By forming the two-page spread images of the original document on two independent transfer papers according to the positions, the images of the two-page spread pages of the original document can be formed on the independent transfer papers, respectively. The images of both pages can be formed on the transfer paper by left-justifying, similarly to the conventional scale-based copying machine.

Further, the page end positions and the center binding positions of the left and right pages of the double-page spread original are detected, and the detected page end positions and center binding positions of the left and right pages of the double-page spread original are detected. And the length information of the transfer paper, the page end position and the center binding position of the left page in the scanning start direction of the double-page spread original are aligned with both ends of the first transfer paper, and the center binding of the double-page spread original is performed. By aligning the copy position and the page edge position of the right page with both ends of the second transfer sheet, and forming the two-page spread images of this document on two independent transfer sheets, the contraction of the document causes the transfer sheet to move to the left and right. Thus, a uniform margin can be formed, and it is possible to prevent an image from being lost when an error in page size detection or a registration (position) deviation of the image formation itself occurs. This is especially effective when the page image reaches near the curved portion of the binding portion of the original document having a thickness of 30 mm or more, and it is possible to arrange the page image in a well-balanced manner so that it does not depend on the edges of the transfer paper. it can.

Further, the page end position and center binding position of the right page of the spread book document are detected, and the detected page end position and center binding position of the right page of the spread book document and the length of the transfer sheet are detected. Information, the center binding position of the double-page spread original in the scanning start direction is aligned with the trailing edge of the first transfer sheet, and the page edge position of the right page of the double-page spread original is conveyed by the second transfer sheet. By forming the two-page spread images of this document on two independent transfer papers according to the trailing edge position in the direction, the images of each page can be formed right-justified on the transfer paper, and the images can be transferred due to the contraction of the document. A margin is formed on the left side of the paper, and a binding margin can be created when the transfer paper after image formation is left bound or bound.

Also, the page edge positions of the left and right pages of the double-page spread original are detected, and the detected page edge positions of the left and right pages of the double-page spread original and the length information of the transfer paper are used. The page end position of the left page of the two-page spread original is aligned with the front end position of the first transfer sheet in the conveyance direction, and the page end position of the right page of the two-page spread original is the rear end in the conveyance direction of the second transfer paper. By forming the two-page spread images of the original document on two independent transfer papers in accordance with the position, an image-formed product having the same page end portion of the original document can be obtained. The image can be arranged symmetrically on each transfer sheet without causing the image to be shifted to the left and right.

Further, the central binding portion position of the double-page spread original document is detected, and the central binding portion position of the double-page spread original document is set to the rear end portion in the conveyance direction of the first transfer sheet according to the detected central binding portion position of the double-page spread original document. The two-page spread images of the original document are formed on two independent transfer sheets in accordance with the position and the leading end position of the second transfer sheet in the transport direction, so that the image is formed on the transfer sheet based on the binding portion of the original document. The images on both pages are continuous when the transfer sheets after the image formation are lined up so as to be suitable for image formation on both spread pages of the original document.

From the page length and the transfer paper length of the main document in the scanning direction, the image reference position on the front surface of the transfer paper is set as the rear end of the transfer paper in the scanning direction, and the image reference position on the back surface of the transfer paper is read and scanned. By setting the front end of the transfer paper in one direction, the images on the front and back of the transfer paper can be shifted to one side, and a binding margin can be created on the transfer paper by shrinking the page image. In addition, the image right-hand side page of the original document is formed on the surface of the transfer paper by aligning the right edge of the page with the rear end position of the transfer sheet.
By aligning the left edge of the double-page spread of the original document with the leading edge of the transfer paper and forming the image information of the double-page spread of the original document on the back side of the transfer paper, the same transfer paper as the front and back sides of one of the double-page spread originals is formed. Images on the front and back can be obtained, and images on the front and back of the transfer paper can be formed at the same position as the original with reference to both edges of the page, and the shrinkage of the original can be used as it is as the margin of the transfer paper. Paper is suitable for binding.

Further, the central binding portion of the original document is aligned with the rear end position of the transfer sheet to form the image information of the spread left page of the original document on the surface of the transfer sheet, and the central binding portion of the original document is set to the front end of the transfer sheet. By forming the image information of the right-side spread of the original document on the back side of the transfer paper in accordance with the position, it is possible to obtain images on both sides of the transfer paper with the facing page of the original document as the front and back sides. You can get a large binding margin with.

Further, the image reference position is selectively set to any one of the transfer paper front end, the transfer paper center, and the transfer paper rear end in the scanning direction, and the read original document image information of the main document is set to the set image reference position. Is converted into image information with the image reference position and formed on the front and back sides of the transfer paper, and when the image reference position is set at the end of the transfer paper in the scanning direction, images are formed on the front and back sides of the transfer paper, respectively. By switching each image reference position at the time of printing to the rear end of the transfer paper and the front end of the transfer paper, the binding margin positions on the front and back of the transfer paper can be automatically distributed without disturbing the operation of the operator, which is suitable for bookbinding.

Further, the image reference position is selectively set to any one of the transfer paper front end, the transfer paper center, and the transfer paper rear end in the scanning direction, and the main document read main document image information is set to the set image reference position. Is converted into image information with the image reference position and formed on the transfer paper, and when the double-sided copy mode is specified, the image reference position is the end of the transfer paper, so that the margin area for binding is standardized when the double-sided copy mode is specified. Can be made.

[0280] Note that this apparatus is intended for a left-turning (left cover) main document with a relatively high ratio of horizontal writing, but there is also a vertical-writing main document for vertical writing. In this case, the device may be arranged symmetrically, and the right and left pages are the reverse of the above description. Therefore, the inventions of the respective claims include those in which the left and right pages and edges of the system are different.

[0281]

As described above, according to the invention of claim 1, the main document reading means for reading the two-page spread original document, the image reference position setting means for setting the image reference position, and the main document reading means are provided. Image reference position conversion means for converting the read book document image information into image information having the image reference position set by the image reference position setting means as the image reference position, and the image reference position conversion means for converting the image reference position. Since the image forming means for forming the image information on the transfer sheet is provided, the image of the original document can be formed at a desired position on the transfer sheet.

According to the second aspect of the present invention, main document reading means for reading the two-page spread original document by slit scanning from the page end direction, and the image reference position for reading the front end of the transfer paper in the scanning direction, the center of the transfer paper, and the transfer. Image reference position setting means selectively set at any one of the trailing edges of the sheets, and the image reference position set by the image reference position setting means for the image information of the original document read from the original document reading means is the image reference position. Since the image reference position converting means for converting the image reference position into the transfer paper and the image forming means for forming the image information having the image reference position converted by the image reference position converting means on the transfer sheet, the image reference position is read and scanned. When set to the leading edge of the transfer paper in the direction, the image can be formed on the transfer paper by aligning the transfer paper to the left just like the conventional scale-based copier. When set to the center, a uniform margin can be created on the left and right of the transfer paper due to the shrinkage of the original, and when the image reference position is set to the rear edge of the transfer paper, the shrinkage of the original causes a right-justified margin on the transfer paper. Can be used as a binding margin.

According to the third aspect of the present invention, main document reading means for reading the two-page spread original document by slit scanning from the page edge direction, and the image reference position for reading the transfer paper front end, the transfer paper center, and the transfer paper in the scanning direction. An image reference position setting means which is selectively set at any one of the trailing edges of the paper and has a default image reference position as the center of the transfer paper, and the read original document image information from the original document reading means is set to the image reference position. An image reference position conversion means for converting the image reference position set by the setting means into image information having an image reference position, and an image for forming the image information whose image reference position is converted by the image reference position conversion means on a transfer sheet. Since the image forming means is provided, an error in transfer paper size detection and a registration (position) of the image formation itself
It is possible to prevent the occurrence of image loss when a shift occurs, and make the image position shift amount inconspicuous without forming an image on the edge of the transfer paper.

According to the invention described in claim 4, in the image forming apparatus for scanning the spread book document from the page edge direction to read the spread book document to form the transfer paper, the spread book document read image information is transferred by a predetermined amount. Since the image reference position moving means for moving the image from the image reference position to form it on the transfer paper is provided, the image of the original can be formed at a desired position on the transfer paper, and a margin can be freely created on the transfer paper. The margin of the lever can be used for binding processing and bookbinding processing.

According to the fifth aspect of the present invention, in the image forming apparatus which scans the two-page spread original document from the page edge direction to read and form it on the transfer sheet, the movement amount of the transfer sheet image reference position is variable in millimeter units. And the image reference position moving means for moving the spread book document read image information from the image reference position of the transfer paper by the movement amount set by the input means to form the image on the transfer paper. The image forming position on the transfer paper can be set finely, and the operator can easily understand the setting of the moving amount of the transfer paper image reference position, and the moving amount of the transfer paper image reference position can be finely adjusted in millimeter units. it can.

According to the sixth aspect of the invention, in the image forming method of scanning the spread book document from the page edge direction to read and form the spread paper on the transfer paper, the page edge position in the scanning start direction of the spread book document is set. The two-page spread images of this document are formed on one sheet of transfer paper by matching the detected edge position of the page with the position of the leading edge of the transfer paper in the conveying direction. The image can be formed left justified in the same manner as in a conventional scale-based copying machine.

According to the invention of claim 7, in the image forming method of scanning the spread book document from the page edge direction to read and form it on the transfer paper, the pages of the spread book document in the scanning start direction and the scanning end direction are read. The edge position is detected to obtain the length information in the scanning direction of the double-page spread original document, and the double-page spread images of the main document are transferred to the transfer paper based on the length information in the scanning direction of the double-page spread original document and the length information of the transfer paper. Since it is formed in the center, a uniform margin can be formed on the left and right of the transfer paper due to the contraction of the original, and it is possible to prevent an error in the page size detection and a loss of the image when the registration (position) deviation of the image formation itself occurs.

According to the eighth aspect of the present invention, in the image forming method of scanning the spread book document from the page end direction to read and form the spread paper on the transfer paper, the page end position in the scanning end direction of the spread book document is set. The page edge position is detected and the information on the length of the transfer sheet is detected, so that the page edge position is formed on one transfer sheet so as to be aligned with the trailing edge position in the transport direction of the transfer sheet. Right justification creates a blank space due to the shrinkage of the original,
A binding margin can be created when the transfer paper after image formation is left binding.

According to the invention of claim 9, in the image forming method of scanning the spread book document from the page edge direction to read and form it on the transfer paper, the page end position and the center of the left page of the spread book document. The position of the binding portion is detected, the detected edge position of the left page of the double-page spread original document is aligned with the leading end position of the first transfer sheet in the transport direction, and the detected position of the central binding portion of the double-page spread original document is set to the second position. Since the two-page spread images of the main document are formed on two independent transfer papers in accordance with the leading end position of the transfer paper in the conveyance direction, it is possible to form the two-page spread images of the main document on the independent transfer papers. Thus, an image can be formed as in a conventional scale-based copying machine.

According to the tenth aspect of the present invention, in the image forming method of scanning the double-page spread original document from the page edge direction to read it and form it on the transfer paper, the left and right page edge parts of the double-page spread original document. The position and the central binding portion position are detected, and the detected page edge position of the left and right pages of the double-page spread original document, the central binding portion position, and the length information of the transfer sheet indicate the scanning start direction of the double-page spread original document. The page edge position of the left page and the center binding position are aligned with both ends of the first transfer paper, and the center binding position of the double-page spread original document and the page edge position of the right page are aligned with both edges of the second transfer paper. Since the two-page spread images of this document are formed on two independent transfer sheets according to the copy, uniform margins can be created on the left and right sides of the transfer sheet due to the contraction of the document, and errors in page size detection and the resist of the image formation itself ( It is possible to prevent the loss of the image when the position shift occurs.

According to the invention of claim 11, in the image forming method of scanning the spread book document from the page edge direction to read and form it on the transfer sheet, the page end position and the center of the right page of the spread book document. The position of the binding portion is detected, and the position of the central binding portion in the scanning start direction of the double-page spread original is determined based on the detected page edge position of the right page and the center binding position of the double-page spread original. Aligned with the rear edge of the transfer paper of 1, and
The two-page spread images of the original document are formed on two independent transfer papers by aligning the position of the page edge of the right page of the two-page spread original document with the rear end position of the second transfer paper in the transport direction. Can be formed right-justified on the transfer paper, and a margin can be formed on the left side of the transfer paper due to the contraction of the original, and a binding margin can be created when the transfer paper after image formation is left-binding or binding.

According to the twelfth aspect of the present invention, in an image forming method for scanning a spread book document from the page edge direction to read and form the spread paper on the transfer paper, the page end portions of the left and right pages of the spread book document are described. The position is detected, and the page edge position of the left page of the double-page spread original is determined from the detected left and right page edge positions of the double-page spread original and the length information of the transfer sheet. Two independent double-page spread images of the two-page spread of the original document are aligned with the leading end position of the two-page spread original document in line with the trailing edge position of the second transfer sheet on the right page of the two-page spread original document. Since it is formed on paper, an image-formed product with the same page edge portion of the original document can be obtained, and the image can be symmetrically arranged on each transfer paper regardless of the opening degree of the binding portion of the original document. Leaning does not occur.

According to the thirteenth aspect of the present invention, in the image forming method of scanning the spread book document from the page edge direction to read the spread book document and form it on the transfer sheet, the position of the central binding portion of the spread book document is detected. According to the detected central binding portion position of the double-page spread original document, the central binding portion position of the double-page spread original document is aligned with the trailing end position of the first transfer sheet in the transport direction and the leading edge position of the second transfer sheet in the transport direction. Since the two-page spread images are formed on two independent transfer papers, the image can be formed on the transfer paper based on the binding portion of the original document. The images on both pages are continuous when the transfer papers of No. 2 are arranged.

According to the fourteenth aspect of the present invention, in the image forming method of scanning the two-page spread original document from the page edge direction to read and form it on the front and back sides of the transfer sheet, the page length of the original document in the scanning direction and the transfer sheet. From the length, the image reference position on the surface of the transfer paper is set as the trailing edge of the transfer paper in the scanning direction, and the image reference position on the back side of the transfer paper is set as the leading edge of the transfer paper in the scanning direction. The binding margin can be created on the transfer paper by the page image shrinkage.

According to the fifteenth aspect of the present invention, the spread book document is scanned and read from the page edge direction, the spread right page of the book document is formed on the surface of the transfer paper, and the spread left page of the document is transferred. In the image forming method to form on the back side of the paper, the image right side of the double-page spread right page of this document is aligned with the rear edge position of the transfer paper, and the image information of the double-page spread right page of this document is formed on the front side of the transfer paper. The image information of the left-page spread of this document is formed on the back side of the transfer paper by aligning the left edge of the left-page spread of the document with the leading edge position of the transfer paper. An image can be obtained, images on the front and back of the transfer paper can be formed at the same position as the original with reference to both end portions of the page, and the contracted portion of the original can be directly used as a margin of the transfer paper. Suitable for binding.

According to the sixteenth aspect of the present invention, the double-page spread original is scanned and read from the page edge direction, the double-page spread of the original is formed on the surface of the transfer paper, and the double-page spread right of the original is transferred. In the image forming method to form on the back side of the paper, align the center binding part of the main document with the rear edge position of the transfer paper and form the image information of the spread left page of the main document on the front surface of the transfer paper. Since the image information of the right-side spread of this document is formed on the back side of the transfer paper in line with the leading edge position of the transfer paper, it is possible to obtain images on both sides of the transfer paper with the double-page spread of the original as the front and back sides. A large binding margin can be taken on the basis of the binding portion of the document.

According to the seventeenth aspect of the present invention, an image reference position setting means for selectively setting the image reference position at any one of the transfer paper front end, the transfer paper center, and the transfer paper rear end in the scanning direction, and a book. An image reference position converting means for converting the original document image information into image information having the image reference position set by the image reference position setting means as the image reference position is provided. The image information whose position has been converted is formed on the front and back sides of the transfer paper, and when the image reference position is set by the image reference position setting means at the end of the transfer paper in the scanning direction, the front and back surfaces of the transfer paper respectively. Since each image reference position when forming an image is switched to the transfer paper rear edge and transfer paper front edge, the binding margin positions on the front and back sides of the transfer paper are automatically assigned without disturbing the operation of the operator. It can be suitable for binding.

According to the eighteenth aspect of the present invention, an image reference position setting means for selectively setting the image reference position at any one of the transfer paper front end, the transfer paper center and the transfer paper rear end in the scanning direction, and a book. An image reference position converting means for converting the original document image information into image information having the image reference position set by the image reference position setting means as the image reference position is provided. The position-converted image information is formed on the transfer paper, and when the double-sided image forming mode is specified, the image reference position is the end of the transfer paper.Therefore, a standard margin area for binding can be created when the double-sided image forming mode is specified. it can.

[Brief description of drawings]

FIG. 1 is a block diagram showing a data processing block of an example of a system to which the present invention is applied.

FIG. 2 is a flowchart showing a read image data processing flow in the TPS of the system.

FIG. 3 is a circuit diagram showing a read image data amplifier circuit in the same TPS.

FIG. 4 is a diagram showing a transition of a left end portion of the original document which is displaced by turning pages of a scanning unit in the TPS.

FIG. 5 is a diagram showing a transition of a left end portion of the main document which is displaced by the page turning of the scanning unit in the TPS when the main document binding portion is moved.

FIG. 6 is a diagram showing a transition of a left end portion of the original document which is displaced by the page turning of the scanning unit in the TPS when the original document binding portion is thin.

FIG. 7 is a waveform diagram showing the read data at the end of the original document of the scanning unit.

FIG. 8 is a partially enlarged side view of the edge of the original document.

FIG. 9 is a timing chart showing a timing of a main document mode operation at the time of first scanning in the spread output / 1to1 copy mode in the TPS.

FIG. 10 is a timing chart showing a timing of main document mode operation during spread output / 1to1 copy mode continuous scanning in the same TPS.

FIG. 11 is a timing chart showing the timing of main document mode operation in independent page output / 1 to 1 copy mode in the same TPS.

FIG. 12 is a timing chart showing the timing of main document mode operation in independent page output / two-copy mode in the same TPS.

FIG. 13 is a timing chart showing the timing of the original document double-sided mode operation in the same TPS.

FIG. 14 is a timing chart showing the timing of main document mode operation in the 1 to 1 high-speed double-sided mode in the same TPS.

FIG. 15 is a block diagram showing a circuit configuration of the system.

FIG. 16 is a side view schematically showing a document table unit in the TPS.

FIG. 17 is a plan view showing the outline of a document placing table in the TPS.

FIG. 18 is a perspective view schematically showing a size stopper that positions the left and right document trays of the document tray unit according to the size of a document.

FIG. 19 is a plan view showing the outline of the size stopper.

FIG. 20 is a perspective view schematically showing a unit opening / closing lock mechanism for opening / closing the scanner unit with respect to the original table unit of the TPS.

FIG. 21 is a side view schematically showing the unit opening / closing lock mechanism.

FIG. 22 is a perspective view showing a document table pressure fixing switching device in the document table unit.

FIG. 23 is a cross-sectional view showing an outline of the platen plate pressure fixation switching device.

FIG. 24 is a perspective view showing a component of the platen pressurization fixing switching device.

FIG. 25 is a perspective view showing an outline of a drive unit of the platen pressurization / fixing switching device.

FIG. 26 is a plan view showing an outline of the platen plate pressure fixation switching device.

FIG. 27 is a schematic cross-sectional view showing an overall configuration of a device body in the TPS.

FIG. 28 is a side view showing an outline of a document table lower retracting operation in the TPS.

FIG. 29 is a timing chart showing the timing of a downward retracting operation of the document table in the TPS.

FIG. 30 is a diagram showing a transition of the scanning unit at the home position in the pressure / fixing operation mode of the document table.

FIG. 31 is a diagram showing a transition at the image reading start position of the scanning unit in the pressure / fixing operation mode of the document table.

FIG. 32 is a diagram showing a transition at a main document center point of the scanning unit in the pressure / fixing operation mode of the document table.

FIG. 33 is a diagram showing a transition during the image reading of the right page of the original document or the right page turning of the scanning unit in the pressure / fixing operation mode of the original table.

FIG. 34 is a diagram showing a transition at the image reading completion position or the page turning start position of the scanning unit in the pressure / fixing operation mode of the document table.

FIG. 35 is a timing chart showing the operation timings of the scanner motor and the left and right document table raising / lowering motors in the pressure / fixing operation mode of the document table.

FIG. 36 is a schematic plan view showing a drive mechanism of a scanning unit in the scanner unit.

FIG. 37 is a sectional view schematically showing a scanning unit in the scanner unit.

FIG. 38 is a schematic sectional view showing the structure of the sheet winding roller of the scanning unit.

FIG. 39 is a schematic side view showing a drive mechanism of a sheet winding roller and a turning roller of the scanning unit in the scanner unit.

FIG. 40 is a schematic cross-sectional view showing the positional relationship between the document pressing roller and the platen glass of the image reading section in the scanning unit.

FIG. 41 is a schematic cross-sectional view showing the positional relationship between the platen glass and the glass holder of the image reading section in the scanning unit.

FIG. 42 is a side view schematically showing a switching mirror driving means and an optical path adjusting means for switching the optical path of the scanning optical system in the scanning unit from the main document scanning side to the sheet original scanning side.

FIG. 43 is a cross-sectional view showing an outline of the scanning unit in a state where the switching mirror is driven to switch the optical path of the scanning optical system in the scanning unit from the main document scanning side to the sheet material document scanning side.

FIG. 44 is a cross-sectional view schematically showing a scanning unit showing another driving means of the switching mirror.

FIG. 45 is a cross-sectional view showing an outline of a main part of a scanning unit, showing a page turning operation of the scanning unit in the TPS.

FIG. 46 is a diagram showing a transition at the left page image reading position of the scanning unit in the page turning operation mode of the scanning unit.

FIG. 47 is a diagram showing a transition at the right page image reading completion position of the scanning unit in the page turning operation mode of the scanning unit.

FIG. 48 is a diagram showing a transition at the right page-turn-up start position of the scanning unit in the page-turning operation mode of the scanning unit.

FIG. 49 is a diagram showing a transition in the middle of right page turning of the scanning unit in the page turning operation mode of the scanning unit.

FIG. 50 is a diagram showing a transition at the right page turning end position of the scanning unit in the page turning operation mode of the scanning unit.

FIG. 51 is a diagram showing a transition of the scanning unit in the course of discharging the right page in the page turning operation mode of the scanning unit.

FIG. 52 is an explanatory diagram of charging timing of the image reading unit and the turning belt at the right page image reading completion position of the scanning unit in the page turning operation mode of the scanning unit.

FIG. 53 is a schematic side view showing a support structure of the scanning unit with respect to the scanner unit.

FIG. 54 is a schematic side view showing a relationship between a scanning rail and a pressing roller of a supporting mechanism of the scanning unit with respect to the scanner unit.

FIG. 55 is a schematic perspective view for explaining the positional relationship between the turning belt and the page feed roller in the scanning unit.

FIG. 56 is a schematic side view showing a contact state of the page feed roller with respect to the turning belt of the scanning unit.

FIG. 57 is a schematic side view showing a state in which the page feeding roller is retracted from the turning belt by a toggle joint device that drives the page feeding roller in association with the operation of the turning belt in the scanning unit.

FIG. 58 is a schematic side view showing a state in which the page feed roller is brought into contact with the turning belt by the toggle joint device.

FIG. 59 is a diagram showing read data for the original document by the reading sensor in the TPS.

FIG. 60 is a block diagram showing an end image detection circuit of the main document in the sub-scanning direction of the TPS.

FIG. 61 is a block diagram showing an end image detection circuit of the main document in the main scanning direction of the TPS.

FIG. 62 is a plan view showing an example of setting an original document of the TPS.

FIG. 63 is a side view showing a main document page storage detection unit of the TPS.

FIG. 64 is a plan view showing a part of a state where the TPS main document is set.

[Fig. 65] Fig. 65 is a diagram illustrating read data of the original document by the reading sensor.

FIG. 66 is a diagram showing read data for the original document by the reading sensor.

67 is a plan view showing a part of the operation unit in the system. FIG.

FIG. 68 is a plan view showing another part of the operating portion of the system.

FIG. 69 is a diagram showing a page image range of a read spread book original of the system.

FIG. 70 is a diagram showing a page image layout in a main document image reference mode of the system.

71 is a diagram showing another page image layout in the main document image reference mode of the system. FIG.

FIG. 72 is a diagram showing another page image arrangement in the original document image reference mode of the system.

FIG. 73 is a diagram showing another page image layout in a book document image reference mode of the system.

FIG. 74 is a time chart showing the copy operation timing in the main document copy mode of the system.

FIG. 75 is a time chart for explaining a reading sub-scanning direction range of a main document image of the system and an arrangement method thereof.

FIG. 76 is a time chart for explaining a reading sub-scanning direction range of the original document image and the arrangement method thereof in the system.

77 is a time chart for explaining a reading sub-scanning direction range of a main document image of the system and a layout method thereof. FIG.

FIG. 78 is a time chart for explaining a reading sub-scanning direction range of the original document image and the arrangement method thereof in the system.

FIG. 79 is a sectional view showing an image forming unit of the system.

FIG. 80 is a flowchart showing a reading scanning flow of the system.

81 is a flowchart showing a part of a print operation flow of the above system. FIG.

FIG. 82 is a flowchart showing another portion of the same print operation flow.

FIG. 83 is a flowchart showing an image reference selection flow of the system.

FIG. 84 is a flowchart showing an image reference mode flow of the above system.

FIG. 85 is a flowchart showing a reference selection flow for double-sided image formation in the system.

FIG. 86 is a flowchart showing another reference selection flow during double-sided image formation in the above system.

[Explanation of symbols]

101 reading sensor 102 VPU 103 IPU 104 frame memory 200 scanning unit 208 turning belt 401, 413 counter 402, 408 data latch circuit 403, 409 digital comparator 404, 405, 410, 411 D flip-flop 406, 412 AND circuit 407 FILO circuit 414 OR circuit

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G03G 15/36 H04N 1/00 108 Q

Claims (18)

[Claims] 1. An original document reading unit for reading a two-page spread original document, an image reference position setting unit for setting an image reference position, and an original document image information read from the original document reading unit is set by the image reference position setting unit. An image reference position conversion means for converting the image reference position thus converted into image information having an image reference position, and an image forming means for forming the image information whose image reference position has been converted by the image reference position conversion means on a transfer sheet. An original document image forming apparatus characterized by being provided. 2. A main document reading means for reading a two-page spread original document by slit scanning from the page edge direction, and an image reference position is selected from one of a transfer paper front end, a transfer paper center, and a transfer paper rear end in the scanning direction. Image reference position setting means for dynamically setting, and an image reference for converting the read original document image information from the original document reading means into image information having the image reference position set by the image reference position setting means as the image reference position. An original document image forming apparatus comprising: a position converting unit; and an image forming unit that forms image information whose image reference position is converted by the image reference position converting unit on a transfer sheet. 3. A main document reading means for reading a two-page spread original document by slit scanning from the page end direction, and an image reference position is selected from one of a transfer paper front end, a transfer paper center, and a transfer paper rear end in the reading and scanning direction. Image reference position setting means for setting the default image reference position at the center of the transfer sheet, and the image reference position set by the image reference position setting means for the read original document image information from the original document reading means. An image reference position conversion means for converting the position into image information having an image reference position, and an image forming means for forming the image information whose image reference position is converted by the image reference position conversion means on a transfer paper. A feature of the original document image forming apparatus. 4. An image forming apparatus for scanning a two-page spread original document from the edge direction of a page to read and form the two-page spread original document read image information by a predetermined amount from an image reference position of the transfer sheet. An original document image forming apparatus comprising image reference position moving means for forming on transfer paper. 5. An image forming apparatus for scanning and reading a two-page spread original document from a page edge direction to form a transfer sheet, and input means for setting a moving amount of a transfer sheet image reference position by changing the unit in millimeters. An image reference position moving unit for moving the two-page spread original document read image information from the image reference position of the transfer sheet by the amount of movement set by the input unit to form it on the transfer sheet. apparatus. 6. An image forming method for scanning a two-page spread original document from the page edge direction to read the two-page spread document to form a transfer sheet, detecting the page edge position of the two-page spread original document in the scanning start direction, and detecting the detected page edge. A method for forming an image of an original document, which comprises forming the two-page spread images of the original document on one sheet of transfer paper by aligning the position of the sheet and the position of the leading edge of the transfer paper in the conveying direction. 7. An image forming method for scanning a two-page spread original document from the page edge direction to read and form it on a transfer paper, and detects the page end positions of the two-page spread original document in the scanning start direction and the scanning end direction to open the two-page spread document. The length information in the scanning direction of the main document is obtained, and the two-page spread images of the main document are formed in the center of the transfer paper based on the length information in the scanning direction of the double-page spread original document and the length information of the transfer paper. This original document image forming method. 8. An image forming method for scanning a two-page spread original document from the page edge direction to read the two-page spread document to form a transfer sheet, detecting the page edge position of the two-page spread original document in the scanning end direction, and detecting the detected page edge. A method for forming an original image according to claim 1, wherein the page edge position is formed on one sheet of transfer paper by aligning the position of the page edge with the position of the trailing edge of the transfer sheet based on the position information and the length information of the transfer sheet. 9. An image forming method for scanning a two-page spread original document in the direction of the page edge to read the two-page spread original document and form it on a transfer sheet. The page edge position and the center binding position of the left page of the two-page spread original document are detected. The detected page edge position of the left page of the double-page spread original is aligned with the leading end position of the first transfer sheet in the transport direction, and the detected central binding position of the double-page spread original document is the leading position of the second transfer sheet in the transport direction. A two-page spread image of the main document is formed on two independent transfer sheets in accordance with the above. 10. An image forming method for scanning a two-page spread original document by scanning from the page edge direction to form it on a transfer sheet, and detecting the page edge position and the center binding position of the left and right pages of the two-page spread original document. However, according to the detected page edge positions of the left and right pages of the double-page spread original document, the center binding position, and the length information of the transfer paper, the page end position of the left page in the scanning start direction of the double-page spread original document is determined. Align the center binding position with both edges of the first transfer paper,
In addition, the two-page spread images of the original document are formed on two independent transfer sheets by aligning the center binding position of the two-page spread original document and the page edge position of the right page with both ends of the second transfer sheet. This document image forming method is characterized. 11. An image forming method for scanning a two-page spread original document in the direction of the page edge to read the two-page spread original document and form it on a transfer sheet by detecting a page edge position and a center binding position of a right page of the two-page spread original document. Based on the detected edge position of the right page of the double-page spread original document, the center binding portion position, and the length information of the transfer paper, the central binding portion position of the double-page spread original document in the scanning start direction is set to the rear end portion of the first transfer paper. And the page end position of the right page of the two-page spread original is aligned with the rear end position of the second transfer sheet in the conveying direction, the two-page spread images of the original document are formed on two independent transfer sheets. A method for forming an original document image, which is characterized by: 12. An image forming method for scanning a two-page spread original document from the page edge direction and reading the two-page spread document to form a transfer sheet, and detecting the page edge positions of the left and right pages of the two-page spread original document. According to the page end positions of the left and right pages of the two-page spread original and the length information of the transfer paper, the page end position of the left page of the two-page spread original is aligned with the leading end position of the first transfer paper in the transport direction,
In addition, the two-page spread images of the main document are formed on two independent transfer sheets by aligning the position of the page end of the right page of the two-page spread original with the rear end position of the second transfer sheet in the transport direction. This original document image forming method. 13. An image forming method for scanning a two-page spread original from a page edge direction to form it on a transfer sheet by detecting the center binding position of the two-page spread original and detecting the detected central binding of the two-page spread original. The two-page spread double-page image of the original document is adjusted so that the central binding position of the two-page spread original document is aligned with the rear end position of the first transfer sheet in the conveyance direction and the leading end position of the second transfer sheet in the conveyance direction. This original image forming method is characterized in that it is formed on an independent transfer paper. 14. An image forming method for scanning a two-page spread original document by scanning it from the page edge direction to form the front and back sides of the transfer paper, wherein an image on the surface of the transfer paper is obtained from the page length and the transfer paper length of the main original document in the scanning direction. A method for forming an original image according to claim 1, wherein the reference position is the rear end of the transfer paper in the scanning direction and the image reference position on the back surface of the transfer paper is the front end of the transfer paper in the scanning direction. 15. An image forming method in which a double-page spread original is scanned and read from a page edge direction, a right-side spread of the original is formed on the front surface of the transfer paper, and a left-page spread of the original is formed on the back surface of the transfer paper. In this method, the image right-side page of the main document is formed on the surface of the transfer paper by aligning the right end of the double-page spread of the original with the rear end position of the transfer paper. A method for forming an image of an original document, characterized in that the image information of a spread left page of the original document is formed on the back surface of the transfer paper by aligning a portion with the position of the leading edge of the transfer paper. 16. An image forming method in which a double-page spread original is scanned and read from a page edge direction, a double-page spread of the original is formed on a front surface of the transfer paper, and a right-page spread of the original is formed on a back surface of the transfer paper. In this method, the center binding part of this document is aligned with the trailing edge position of the transfer paper, and the image information of the spread left page of this document is formed on the surface of the transfer paper. A method for forming an image of an original document, characterized in that the image information of the right-side spread of the original document is also formed on the back surface of the transfer paper. 17. An image reference position setting means for selectively setting an image reference position at any one of a transfer paper front end, a transfer paper center, and a transfer paper rear end in the scanning direction, and a main manuscript reading main manuscript image information. An image reference position conversion unit that converts the image reference position set by the image reference position setting unit into image information having an image reference position is provided, and image information whose image reference position is converted by the image reference position conversion unit is provided. When the image is formed on the front and back sides of the transfer paper, and the image reference position is set by the image reference position setting means at the end of the transfer paper in the scanning direction, each image when forming an image on the front surface and the back surface of the transfer paper This original image forming method is characterized in that the reference position is switched to the rear end of the transfer paper and the front end of the transfer paper. 18. An image reference position setting means for selectively setting an image reference position at any one of a transfer paper front end, a transfer paper center, and a transfer paper rear end in the scanning direction, and a main manuscript reading main manuscript image information. An image reference position conversion unit that converts the image reference position set by the image reference position setting unit into image information having an image reference position is provided, and image information whose image reference position is converted by the image reference position conversion unit is provided. A method for forming an original image, which is characterized in that the image is formed on a transfer sheet, and the image reference position is the edge of the transfer sheet when the double-sided image forming mode is designated.