JPH08154158A - Book source document image reader - Google Patents

Abstract

PURPOSE: To secure the image data storage range of a storage means regardless of the displacement of the spread page position of a book source document. CONSTITUTION: This reader is provided with a read means 200 for reading the images of a spread book source document from one page end part direction of the spread book source document, the storage means 104 for storing read image data provided with the image data storage range for more than the images of the spread page of the book source document and a page turning means for turning the page of the book source document from the other page end part direction of the spread book source document. The surplus portion of the image data storage range of the storage means 104 is arranged in an end part direction on a page turning side.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventionally, a digital copying machine scans and reads an original, stores the read image data in a storage means, and the read image data storage start position of the storage means is a fixed position corresponding to the upstream side of the reading scan. The position is.
Further, in Japanese Laid-Open Patent Publication No. 5-268434, a storage device is provided for storing either one of the left and right pages of a double-page spread original, and the next double-page spread or the previous double-page spread stored in the storage device is provided. There is described a double-sided copy device for copying the image of the above and the images of the pages having the front and back relations on the front and back of one sheet. In this double-sided copying apparatus, although the image storage range of the storage device changes, the document position is fixed, and in order to store images in the storage device on the basis of the document for documents of various sizes, the page position of the spread document is accurate. Need a big set. Therefore, input means for inputting the document size is provided to determine the image storage range of the storage device according to the document size, or the document position is automatically determined to determine the image storage range of the storage device according to the document size. It is essential to do so. Conventionally, there is no conventional document image reading device that reads an image of a document whose placement position is not a corner or an end reference and performs scaling.
Further, some copying machines automatically select the paper size by automatically detecting the document size.

[0003]

SUMMARY OF THE INVENTION In a main document image reading apparatus for reading an image of a main document, a two-page spread original document is placed on a platen with reference to the center binding portion thereof and an image of the two-page spread main document is set to a two-page spread document. When the image data is read from one edge of one page and the read image data is stored in the image memory, the image data storage range of the image memory is limited due to the capacity of the image memory, and the read image edge of the read image data is limited. Occasionally, the image data of a part is missing.

That is, in the image memory, the read image data storage start position is a fixed position corresponding to the upstream side of the reading scan, but the double-page spread position of this document is displaced to the upstream side of the reading scan as the page is turned. In the image memory, the position where the read image data is stored changes, the read image data cannot be stored in the predetermined image data storage range, and a part of the read image data may be lost. When a part of the read image data is missing, an unsightly image may be output when the image data is output from the image memory to a printer or the like to form an image on a sheet.

Since the original size is automatically detected in the copying machine and the like, the original image reading apparatus also automatically detects the original size and determines the image data storage range of the image memory according to the original size. It is possible to decide. However, in such a case, the detection accuracy of the size of the original document is low and is affected by the original document, that is, the original document has gravure or a step is formed at the end portion of the original document, and thus the original document size is reduced. Difficult to detect. When copying multiple pages of this document, unlike copying a sheet document, it is not common to copy a part of the page image of this document, and the size of this document cannot be detected. Have difficulty. Furthermore, this document has a high proportion of non-standard sizes, and it is difficult to determine the size.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a book document image reading apparatus capable of ensuring the image data storage range of the storage means regardless of the displacement of the spread page position of the book document. To do.

[0007]

In order to achieve the above object, the invention according to claim 1 provides a reading means for reading an image of a two-page spread original from one page end direction of the two-page spread original, and read image data. An image stored in the storage means is provided with a storage means having an image data storage range equal to or more than the spread page image of the book document The surplus portion of the data storage range is arranged in the direction of the edge on the page turning side.

According to a second aspect of the present invention, there is provided a reading means for reading an image of the two-page spread original document, a storage means for storing the read image data, and a page turning means for turning pages of the main original document. Storage capacity equal to or larger than the size of two pages of the maximum page size of this manuscript and less than or equal to the size of two pages of the maximum page size of this manuscript plus the thickness of the maximum manuscript thickness It is the capacity.

According to a third aspect of the present invention, the image of the two-page spread original is opened, the reading means for reading from one page end direction of the two-page spread original, the storage means for storing the read image data, and the page of the two-page spread of the original. A page turning means for turning over from the other page end direction of the original document, a page edge detecting means for detecting a page edge position of the spread book original at the time of turning the page, and the storage after the page edge position detection of the spread book original is completed. Means for determining the spread page image data storage start point of the means by the detection signal of the page edge detecting means.

[0010]

According to the invention of claim 1, the reading means reads the image of the two-page spread original from the direction of one page end of the two-page spread original, and the page-turning means opens the page of the two-page spread of the original manuscript. Turn over from the direction. The storage unit stores the read image data, and the surplus portion of the image data storage range is arranged in the direction of the end on the page turning side.

According to the second aspect of the invention, the reading means reads the image of the two-page spread original document, and the page turning means turns the pages of the main document. The storage means has a size equal to or larger than a size corresponding to two pages of the adaptive maximum page size of the original document and equal to or smaller than a size including two pages of the adaptive maximum page size of the original document and the thickness of the maximum original document thickness. It has a capacity and stores read image data.

According to the third aspect of the invention, the reading means reads the image of the two-page spread original from the direction of one page end of the two-page spread original, and the page turning means opens the page of the two-page spread of the main original. Turn over from the direction. The read image data is stored in the storage means, and the page edge position of the two-page spread original document is detected by the page edge detection means when the page is turned. After the detection of the page edge position of the double-page spread original, the storage start point of the double-page spread image data in the storage means is determined by the detection signal of the page edge detection means.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of a document image forming apparatus to which the invention described in claims 1 to 3 is applied. This book document image forming apparatus is a book document / sheet document image reading apparatus (TPS:
A device that outputs a read image of Turn the Page Scanner) by an electrophotographic printer, and includes a scanner unit 500 for reading a document and a printer 501 for forming an image. The scanner unit 500 scans the document. It has a scanning unit 200 for reading and turning pages. The scanning unit 200 includes an image reading plate (SBC) 101 having a CCD (charge coupled device) for reading a document image, and the image reading plate 101.
VPU (Video Processing Uni), which processes analog image signals from video to A / D conversion
t) 102, a fluorescent lamp for illuminating a document and its inverter power source, a carriage 502 for relaying the signal lines of the load system in the scanning unit 200 such as a heater, a thermistor, a fan, a solenoid, and the wiring of the power source line. The carriage 502 and the VPU 102 are independent flexible cables for IPU (Image Process).
ig Unit (image processing apparatus) 103.

The IPU 103 is attachable / detachable by a connector and includes a frame memory 104 composed of a DRAM module for storing a read image signal.
A microcomputer therein controls loads such as a stepping motor for scanning the scanning unit 200 and a document table driving DC motor via a motor driving circuit 503, and also drives a sensor.

The printer 501 has a main control plate 107 including a main control unit for controlling copy mode, fetching key signals from the operation unit 99 and display control, and a sequence control unit for controlling copy timing. The unit, the IPU 103, the sequence control unit, and the microcomputer of the operation unit 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. 2 shows the data processing flow block of this device. This device includes a TPS image reading unit,
It is roughly divided into an image data processing unit and an image forming unit. The image reading plate 101 arranged at the right end of the scanning unit of the TPS has a CCD (charge coupled device).
The 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 image reading plate (reading sensor) 101 to digital conversion, and obtains read image data of 8 bits for each dot. .

Then, the VPU 102 has each dot 8
The bit read image data is synchronized with the clock and the gate signal in the main scanning direction, and IP is applied at a speed of about 7.5 MHz.
The data is output to the U 103, and the IPU 103 performs processing such as scaling of image data from the VPU 102 and high-quality processing of electronic photography. In the final processing of the image data, the IPU 103 performs gradation processing including γ correction of the image data, converts each dot into 4-bit video data suitable for writing, and stores the processed image data in the frame memory 104.

In this apparatus, the reading speed of the original document is 90
mm / sec. Scanning speed of sheet original 90m
m / sec. , Image forming speed 180 mm / sec. As described above, there is a difference between the reading scanning speed and the image forming speed of the printer 501, and the frame memory 104 for one page of A3 size is used for the speed buffer. Further, since the TPS comes into contact with the original document and scans the original document to read the frame memory 104, the image data is repeatedly read a plurality of times during the repeat copy, which is effective for protecting the original document during the repeat copy. Is. Further, in this apparatus, the images on the left and right pages can be divided and output by using the frame memory 104 in one scan reading at the time of continuous page printing in which the images on the left and right pages of the original are independently printed. , TPS does not require synchronous scanning with the image writing of the laser printer 501 forming the image forming unit or rerunning.

Further, due to the speed correspondence of the IPU 103, the frame memory 104 having a 4-bit dot structure is used for the IPU 1
By placing the image data after the image processing by the IPU 103 in the frame memory 104, the capacity of the frame memory 104 is halved with respect to the read image data of 8 bits for each dot. IPU
The image data input from 103 to the frame memory 104 is performed for two dots of the image data in parallel, and
The operation is sequentially performed at a speed of about 3.8 MHz. On the other hand, the image data from the frame memory 104 is the same as the image data 2
Dots are output in parallel and the clock and main scanning direction sent from the IPU 103 at a speed of about 7.5 MHz,
The main control plate 107 is synchronized with the gate signal in the sub-scanning direction.
Are sequentially output to.

The main control board 107 is a frame memory 1
The image data output from 04 at a high speed according to the image forming speed of the laser printer 501 is converted into a serial image data of about 15 MHz, and a FIFO (First In Fi
rst Out) memory to further speed up in the main scanning direction,
It is synchronized with a write clock of about 18 MHz. 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 drive the electrophotographic laser printer 5 via the LD driver.
The LD 105 of No. 01 is made to emit light to expose and scan the photoconductor to form an image.

The IPU 103 is a scanning unit 2 of the TPS.
00 scanning control is also performed, and the scanner motor 106, which is a stepping motor for scanning the scanning unit 200 at the time of reading the sheet document image and the main document image, is driven to scan the scanning unit 200 at a scanning speed of 90 m.
m / sec. The scanning unit 200 is scanned at a linear velocity of 1.41 times to 0.71 times at the time of variable magnification including zoom from 71% to 141%.

Further, the scanner motor 106 is 120 mm / sec. The scanning unit 200 is scanned at a speed of. Further, the IPU 103 is provided with a SCSI interface 98 for transferring the read image data to another system device, for example, a printer or a workstation, and the main control board 107 takes in signals from the operation unit 99 and outputs signals to the operation unit 99. Output.

FIG. 3 shows the overall structure of the TPS. This T
In the PS, an original placing table 206 made of contact glass and a scale 207 are arranged on the upper part of the apparatus main body, and an original such as a sheet is placed on the contact glass 206, and a pressure plate (not shown) is placed on the original. Covered. The original on the contact glass 206 is scanned and read by the scanning unit 200. The scanner unit 30 is provided in the upper half of the main body of the TPS, and the scanning unit 200 is provided inside the scanner unit 30.
In, a document is scanned by traveling in the left-right direction.

FIG. 4 shows the scanning unit 20 in this apparatus.
The 0 page turning section is shown. Turning belt 2 in this device
No. 08 is made of PET, PC, PVC or the like, and has a double structure resin including a surface layer made of a high resistance film having a surface resistance of 10 ¹⁴ Ω or more and a back layer made of a low resistance film having a surface resistance of 10 ⁸ Ω or less. It is made of film. Also,
The turning belt drive roller 223 is composed of a metal roller whose surface is coated with a conductive rubber and is grounded, and realizes reliable driving and grounding of the turning belt 208. The turning belt 208 is stretched between the turning belt drive roller 223 and the turning roller 224, and is turned over.
It is rotationally driven by 23.

Further, the charging roller 225 is composed of a metal roller or a roller in which the surface of the metal roller is coated with conductive rubber, and this charging roller 225 has a changeover switch 2
A high voltage of ± 2 to 4 kV is applied at a predetermined timing from the AC power supply 253 via 53a. The AC power supply 253 is controlled by the pulse from the pulse generator 253b.
While the scanning unit 200 runs and the turning belt 208 is driven, the changeover switch 2
53a is turned on, and the charging roller 225 is driven by the high-voltage power supply 253 to ± 2 to 4k which matches the frequency of the pulse generator 253b.
When an AC high voltage of V is applied, an alternating electric field is generated on the surface of the turning belt 208 by the charging roller 225, and the action of this alternating electric field attracts the top page 254 of the original document BO to the surface of the turning belt 208. Power is generated. The high voltage power supply 253 is arranged in the scanning unit 200.

When the scanning for reading the original is started,
The scanning unit 200, which was at the left end home position of the scanner unit 30, starts traveling rightward in FIG. At this time, the turning belt 208 and the page feed roller 2
The solenoid 50 is moved to the position shown by the solid line in FIG. 4 by a solenoid (not shown). The original reading position below the platen glass 205 of the scanning unit 200 is the original B.
On the left page of O, as shown in FIG. 5, the scanning unit 200 starts the reading operation of the main document BO and starts scanning the main document BO.
Scan the original side of the document from left page to right page. here,
The reading start position of the scanning unit 200 is the original document BO.
It depends on the size.

In this way, the scanning unit 200 reads the surface of the original BO from the left page to the right page. During the reading operation of the scanning unit 200 as shown in FIG. 5, the turning belt 208 and the page feed roller 250 are moved to the position shown in FIG.
Is held at the position indicated by the solid line. Then, when the scanning unit 200 finishes reading up to the edge of the double-page spread of the original document, the original scanning direction of the scanning unit 200 is reversed as shown in FIG.

At this time, as shown in FIG. 6, the turning belt 2
08 and the page feed roller 250 are moved to a position indicated by a broken line in FIG. 4 by a solenoid (not shown). At about the same time, the changeover switch 253a is turned on, and the pulse generator 253b and the high-voltage power supply 253 apply an AC high voltage of a predetermined frequency to the charging roller 225 via the changeover switch 253a, so that the surface of the turning belt 208 is covered. A charge pattern is formed.

When the page turning of the original document BO is started,
The turning belt 208 and the page feed roller 250 are located at the positions shown by the broken lines in FIG. 4, and the charging pattern portion formed on the surface of the turning belt 208 prior to the page turning operation is the top page 254 of the original document BO. Overlap. Then, when the tip of the top page 254 crosses over the lower center of the turning belt 208, the turning belt 208 and the page feed roller 250 are shown by the solid line in FIG. 4 by the action of a solenoid (not shown) as shown in FIG. Be moved to a position. As a result, the top page 2 of the original document BO is attracted by the attraction force due to the uneven electric field of the charge pattern formed on the surface of the turning belt 208.
Only 54 is attracted onto the surface of the turning belt 208 and the end of this top page 254 is lifted with the turning belt 208.

The top page 254 of the original document BO is flipped up and the scanning unit 200 moves again toward the end home position as shown in FIG. 7, and the top page 254 of the original document BO is shown in FIG. As described above, the sheet is sandwiched between the turning roller 224 and the page feed roller 250 and is reliably conveyed. The uppermost page 254 passes between a pair of upper and lower page guides 227 and 228 arranged on the right side of the scanning unit 200, and its tip side is sent to the outside of the scanning unit 200 on the right side. At this time, the page sensor 214 mounted 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 it is detected that the original page is normally turned.

Next, as shown in FIG. 9, when the uppermost page 254 of the original document BO is turned up to the binding portion of the original document BO, the turning belt 208 and the page feed roller 250 are at their original positions (broken line positions in FIG. 4). ) Return to. In this state, the scanning unit 200 further moves toward the end home position,
As shown in FIG. 10, the original pages that have been turned up are pulled by the binding portion of the original document and returned between the pair of page guides 227 and 228 while being overlapped on the left page of the original document BO and inside the scanning unit 200. Emitted from.

When the turned-up original pages are all superposed on the left page of the main original BO, the scanning unit 200 completes one image reading / page-turning operation for the spread main original. Here, when the image reading / page turning operation is repeatedly performed on the original document BO, or only one of the image reading and page turning operations is repeatedly performed, the original page turned up as described above. Are all superposed on the left page of the original document BO, and at the same time, the moving direction of the scanning unit 200 is reversed and the reciprocating operation of the scanning unit 200 is repeated in the shortest course with respect to the original surface of the original document. It should be noted that the scanning unit 200 uses the original B
In some cases, only the O reading operation or only the page turning operation is performed.

When the original pages electrostatically attracted onto the turning belt 208 are turned, the turning belt 2 is turned by a solenoid.
08 is rocked upward, and the page end portion attracted to the turning belt 208 is lifted to the scanning unit 200 side. At this time, the page sensor 214 detects whether or not the pages of the original document BO are turned. When the page detection by the page sensor 214 is not performed at a predetermined timing during page turning, the page turning operation is re-executed.

As shown in FIG. 11, the mirror 222 is driven by a mirror switching solenoid, and when the mirror switching solenoid is turned on / off, the mirror 222 is moved back and forth to the optical path. The upper reading optical path is switched. As the light source for illuminating the original, two fluorescent lamps 201, 202, 2 provided in each of the upper and lower reading portions of the scanning unit 200 are used.
03 and 204 are used respectively.

When reading the original on the contact glass 229, the mirror 222 advances into the optical path and the original on the contact glass 229 is illuminated by the fluorescent lamps 203 and 204, and the reflected light is reflected by the mirrors 222, 220 and 221 and the lens 216. Through the CC on the image reading plate 101
An image is formed on D and photoelectrically converted. When reading the original document, the mirror 222 is retracted from the optical path and the original table 1 is read.
The upper original manuscript illuminates the original manuscript on the manuscript table 1 through the platen glass 205, and the reflected light is reflected by the mirrors 219 and 22.
Image reading plate 1 through 0, 221 and lens 216
An image is formed on the CCD on 01 and photoelectrically converted.

By the way, as shown in FIG. 3, the manuscript table unit 35 in this apparatus is provided with one manuscript table 1 on each of the right and left sides of the center of the apparatus body, and the link mechanism 11 is provided.
It is supported by the vertical movement. Each platen 1
The springs 13 applied to the link mechanism 11 are respectively pressed upward. Further, as shown in FIG. 12, a document holding plate 14 is provided on the back side of the document table 1 via a hinge 12.
Is rotatably supported on the document table 1. A stopper claw 15 is provided at the front end of the document pressing plate 14, and the stopper claw 15 is provided on the front side of the document table 1 when the document pressing plate 14 is laid down on the document table 1 in FIG. It is adapted to be locked by the stopper 16.
As described above, in the document table unit 35 of this apparatus, since the stopper mechanism of the document pressing plate 14 is on the front side of the document table unit 35, the operation of the document pressing plate 14 can be easily performed.

On the other hand, a plurality of holes 1a are formed on the upper surface of the document table 1.
, And a part of the stator 17 is projected from these holes 1a. Further, rubber plates 18 for surely pressing and fixing the cover of the original document BO are attached to the upper surfaces of the stators 17. Each stator 17
Is a rotary shaft 20 fixed near the center of the document table 1.
(See FIG. 13), each of which is rotatably supported.
Further, each stator 17 is provided with a spring not shown in FIG.
Are urged in the directions indicated by the arrows.

As a result, as shown in FIG. 13, the front cover and the back cover of the original document BO are sandwiched between the document pressing plate 14 and the document table 1, and the stopper 15 of the document pressing plate 14 is engaged with the stopper 16. By stopping, the original document BO is securely fixed on the document table 1. In this case, in this device, each stator 1
By arranging 7 near the center of the apparatus of the document table 1,
With the stator 17 and the document pressing plate 14, the front cover and the back cover of the book document BO near the binding portion BOa can be pressed and clamped to more securely fix the book document BO on the document table 1.

Here, when the document holding plate 14 is fixed on the document table 1 in a state where the document BO is not placed, a gap of several mm is formed between the document holding plate 14 and the document table 1. It is set and configured so that a book document having a thick cover can also be fixed. Furthermore, in this device, as shown in FIG.
As shown in, the left platen 1 can only be moved up and down,
The main document BO placed on it is prevented from being displaced. On the other hand, the right document table 1 is supported not only by vertical movement but also by the slide groove 21 so as to be movable in the horizontal direction in FIG. The right manuscript table 1 is urged to move to the left by a spring 10 so that the slide shaft 22 embedded in the link mechanism 11 abuts against the end of the slide groove 21 on the side surface of the manuscript table 1. As a result, the movement of the document table 1 is stopped.

Next, the document platen pressure fixing switching device and the document platen retracting device of this apparatus will be described. Link mechanism 1
A document table 1 configured to be movable in the vertical direction by 1 is always biased by a spring 13 so as to move upward (see FIG. 3). As a result, in the state where the document table unit 35 is set in the apparatus and the document table pressing operation mode is entered, the original document BO which is opened and placed on the document table 1 due to the rising behavior of the document table 1 The surface is constantly pressed upward so as to be pressed against the lower portion of the scanning unit 200 in the scanner unit 30.

The pressing force on the original surface of the original document BO is normally received by the scanning unit 200. However, when the scanning unit 200 is moved to a position on the original platen 1 which is out of the original document, the original platen 1 is moved. Due to the rising habit, the document table 1 and the main document BO bite into the scanner unit 30 and hinder the smooth movement of the scanning unit 200. Therefore, with the platen 1 raised to an appropriate position, the platen 1
Must be fixed to prevent the document table 1 and the main document BO from excessively digging into the scanner unit 30 due to the rising behavior of the document table 1. Further, when the scanning optical path in the scanning unit 200 is switched by the mirror 222 to read the original on the contact glass 206 arranged on the upper part of the scanner unit 30, the lower part of the scanning unit 200 and the upper surface of the original table 1 do not come into contact with each other. Manuscript stand unit 3
It is necessary to retract the document table 1 below the table 5.

The document table pressure fixing switching device and the document plate retracting device are devices for satisfying these needs.
14 to 18 show a structural example of a mechanism in which both of these devices are combined by one mechanism. The control wire 40 of this mechanism has a hook 41 fixed to one end as shown in FIG. Another hook 42 is fixed to the other end of the control wire 40, and a spherical stopper ball 45 is fixed near the substantially central portion of the control wire 40.

The hook 41 is fixed to the outer end of the link mechanism 11 (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 changes its direction via a pulley 46 and a pulley 47, and is wound around a control pulley 48. Where the control wire 40
As shown in FIGS. 15 and 16, the stop ball 4 is guided to the groove 50 of the control pulley 48 and fixed near the central portion thereof.
5 is fitted in a stop hole 49 of the control pulley 48.
This ensures that the movement of the control wire 40 is converted into a rotational movement of the control pulley 48.

The control wire 40 wound around the control pulley 48 and extended is always 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 has a one-way clutch 51 as shown in FIG.
It is supported by the shaft 54 via. The shaft 54 is rotatably supported with respect to the side plate 55 via the slide bearings 52 by both ends of which are prevented from slipping off by the E-rings 53 on the slide bearings 52 supported by the pair of side plates 55.

As a result, the control pulley 48 can freely rotate with respect to the shaft 54 in the direction of arrow a in FIG.
Due to the action of 1, the shaft 54 cannot rotate relative to the shaft 54, but rotates together with the shaft 54. 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. 14, that is, in the rotation direction when the document table 1 is lowered.

Next, the lowering / fixing operation of the document table 1 by the document table pressure fixing switch device will be described. FIG.
4 to 16, when the shaft 54 is in a fixed state, when the document table 1 is pushed down by some external force, for example, the weight of the document BO or the pressure of the page to be turned, the document table 1 is fixed to the document table 1 side. The end of the control wire 40 on the hook 41 side is loosened.

At the same time, the control pulley 48 causes the tension spring 4 to move.
3, the control wire 40 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 and moves to the hook 44 side. 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. Control pulley 48 by ascending force
Is not rotated in the direction opposite to the arrow a, and the control pulley 48 is stopped while maintaining the position rotated in the arrow a direction. Further, the movement of the control wire 40 is also stopped as the control pulley 48 is 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, the gear 56 is fixed to the shaft 54 so as to rotate integrally with the shaft 54 as shown in FIG. Further, as shown in FIG. 18, the gear 56 meshes with another gear 57 rotatably supported by a stud 59 fixed to the side plate 55, and the rotation thereof is transmitted to the gear 57. Has been done.

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 platen 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 meshing with the gear 57 integrated with the worm wheel 58 is not supported. The shaft 54 connected through the above is in a fixed state.

Next, the operation of retracting the document table 1 below the document table unit 35 will be described. In FIGS. 17 and 18, when the platen raising / lowering motor 61 is driven so that the gear 56 rotates in the direction of arrow b, the one-way clutch 51 causes the control pulley 48 and the shaft 54 to rotate integrally, and the control pulley 48 moves. The control wire 40 rotates in the direction of arrow a and moves to the hook 44 side.

Due to the movement of the control wire 40, the left and right manuscript tables 1 in FIG. 3 and FIG.
And a lower position of the document table unit 35 where the upper surface of each document table 1 (the document surface of the original document BO in this apparatus) is separated from the scanning unit 200. That is, the vehicle is retreated to the position shown in FIG. This evacuation operation is executed when the apparatus main body is powered on, in a standby state in which reading scanning is not performed, when reading a document on the contact glass 206 arranged above the scanner unit 30, and when pulling out the document table unit 35.

Next, the operation of pressing the document table 1 upward of the document table unit 35 will be described. Contrary to the above-described retracting operation, in FIG. 17 and FIG. 18, the gear 56 is indicated by the arrow c.
When the platen raising / lowering motor 61 is driven to rotate in the direction, the shaft 54 rotates in the direction opposite to the arrow a direction in FIG. It will be in a state. Here, in this apparatus, the force of the torsion spring 13 that pushes the document table 1 upward is set to be stronger than the force that pulls the control wire 40 downward.

Therefore, when the control pulley 48 can freely rotate in the direction opposite to the direction of the arrow a, the control wire 40 is moved to the hook 41 side by the force of the torsion spring 13 that pushes the document table 1 upward. Moving. Due to the movement of the control wire 40, the left and right manuscript tables 1 are raised in FIG. .

As described above, when the original table raising / lowering motor 61 is continuously driven in a state where the left and right original tables 1 are raised and the original surface on each original table 1 is in pressure contact with the scanning unit 200, the one-way clutch 51 acts. The shaft 54 is allowed to freely rotate with respect to the control pulley 48, and 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 FIGS. 3 and 20, one set of the platen pressurizing / fixing switching device 50A and one set of the platen retracting device 50B are provided for each of the pair of left and right platens 1, and a scanning unit is provided. They are independently controlled according to the moving position of 200. That is, the pair of left and right platen raising / lowering motors 61, which are the driving sources of the platen pressure fixing / switching device 50A and the platen retracting device 50B, are independently controlled.

FIG. 20 shows the downward evacuation operation of the document table 1 in the evacuation operation mode described above, and FIG. 21 shows its timing chart. In this retracting operation mode, as shown in FIG. 21, the left and right platen raising / lowering motors 61 are rotated in reverse until the left and right platen lower limit sensors 304 detect each platen 1 before the movement of the scanning unit 200 is started. As shown at 19, the left and right platens 1 are lowered. After that, the scanner motor 106 is driven and the scanning unit 200 moves in a predetermined direction to perform scanning. If necessary, this scanning is repeated many times. Then, at the end of this retracting operation mode, the scanning unit 200 returns to the central home position, the left and right platen raising / lowering motors 61 rotate forward a predetermined number of times, and the left and right platens 1 return to their original positions.

On the other hand, when the document on the contact glass 206 is read, the scale 207 serves as a placement reference for the document end face. This reference is different from the reading start position of the original document so that the configuration has a minimum size. As a result, the reading start point of the document is always constant, and control is simple. When the sheet mode for reading the original on the contact glass 206 is entered, the scanning unit 200 moves to the left from the central home position after the original table lower standby operation, and the edge home detected by the edge HP sensor is detected. Position (scanning unit 20 shown in FIG. 22)
0 position) and come to a stop. Then, it waits until the reading condition is input by the operation unit 99 and the start switch is turned on. Here, when the start switch is turned on, the scanner motor 106 is driven and the scanning unit 2
00 is scanned rightward in FIG.
The document on 6 is read by the scanning unit 200.

Next, the pressing / fixing operation mode of the document table 1 will be described. Since the scanning unit 200 returns to the central home position shown in FIG. 3 when the operation of the TPS in the original document reading mode is completed, the scanning unit 200 is still in the central home position when the original document BO is set on the TPS. This is because the main document BO is set with the center of the TPS as a reference, so that when the document table unit 35 is slid and closed and then the document table 1 is raised and set, any size of the document can be surely pressed. This is because When this operation starts,
The central HP sensor confirms that the scanning unit 200 is in the central home position. And the scanning unit 2
00 moves to the left from the central home position and is detected by the end HP sensor at the end home position (see FIG. 23).
(See) and come to a stop.

22 to 26 are transition diagrams of the scanning unit 200 when the original table 1 is in the pressure / fixing mode.
FIG. 27 shows the timing chart. The end home position of the scanning unit 200 (see FIG. 22) is a read page turning operation start point and an operation end point. At this end home position, the scanning unit 200 does not rest on the document table 1. In this state,
The document table raising / lowering motors 61 on both sides are stopped, and the left and right document table 1 are both fixed.

In the pressurizing / fixing mode of the original table 1, first, the scanner motor 106, which is the drive motor of the scanning unit 200, rotates in the forward direction to move the scanning unit 200 to the right in FIG. When the document pressing roller 281a on the right side of the scanning unit 200 is applied to the left end of the original document BO (point A; see FIG. 23), the left platen raising / lowering motor 61 is rotated in the normal direction, and the left platen 1 is added. It becomes a pressure state.
As a result, the original document BO is pressed against the scanning unit 200, and optimum reading is performed.

Shortly before the scanning unit 200 reaches the main document center point (see FIG. 24), the right document pressing roller 281a contacts the left end of the right document table 1 (point B; see FIG. 27). At that time, the right platen lifting motor 6
1 is rotated in the normal direction, and the document platen 1 on the right side is pressed. Next, 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 is applied to the right end of the left document table 1 (point C; see FIG. 27). At this time, the left platen raising / lowering motor 61 is stopped and the left platen 1 is fixed. As a result, the original document BO is fixed and pressed by the document pressing sheet 282b without biting into the scanner unit 30 and waits for the next passage of the scanning unit 200 while keeping the same height.

FIG. 25 shows the operating state of the scanning unit 200 during the reading of the right page of this document or the turning up of the right page. In the scanning unit 200 that has finished reading the right page of this document, the left document pressing roller 281b is in contact with the right end of the right document table 1 (point D; see FIG. 26).
Then, the scanner motor 106 rotates in the reverse direction to move the scanning unit 200 leftward. As a result, the scanning unit 200 advances while flipping up the right page of the original document BO, and the left original pressing roller 281b is brought to the right end of the left original table 1 shortly before reaching the central point of the original document (see FIG. 24). It takes (C point). At that time, the left platen raising / lowering motor 61 rotates in the normal direction, and the left platen 1 is brought into a pressurized state.

Then, the scanning unit 200 passes the center point of the original document and starts the operation of superposing the turned up right page on the left page of the original document. After that, the right document pressing roller 281a contacts the left end of the right document table 1 (point B). At this time, the right platen lifting motor 6
1 is stopped, and the document table 1 on the right side is fixed. As a result, the original document BO is fixed and the scanner unit 30 is fixed.
The sheet is pressed by the document pressing sheet 282a without biting into the sheet, and waits for the next passing of the scanning unit 200 while keeping the same height.

After that, the scanning unit 200 proceeds while superposing the turned-up page on the left side page, and after the superposition of this page is completed, the right original pressing roller 281 is pressed.
a is applied to the left end of the document platen 1 on the left side (point A; FIG. 23).
reference). At this time, the left platen raising / lowering motor 61 is stopped and the left platen 1 is fixed. As a result, the original document BO is fixed and pressed by the document pressing sheet 282b without biting into the scanner unit 30 and waits for the next passage of the scanning unit 200 while keeping the same height. Then, the scanning unit 200 reaches the end home position (FIG. 21) and stops.

Next, the document table front drawing mechanism will be described. As shown in FIGS. 3 and 20, slide rails 300 are connected to the left and right side surfaces of the document table unit 35 so as to be slidable in the front-rear direction of the apparatus body with respect to the rail brackets 301 in the scanner unit 30. When the document table unit 35 is housed in the scanner unit 30 (set), the open / close lock device 302 shown in FIG. 20 fixes the document table unit 35 and the operator sets the document table unless otherwise specified. Unit 3
It is in a state where 5 cannot be pulled out. This state is detected by the open / close lock sensor 320. The slide rail 300 has an expansion / contraction capability enough to pull out the document table 1 on the document table unit 35 from the front surface of the main body of the apparatus. Further, on the front surface of the document table unit 35, an open / close switch 303 and a not-shown handle for pulling out the document table are attached.

Next, the operation of setting the original document will be described. When the operator sets the original document on the original table 1, after confirming that the operation mode is the original document mode, the operator presses the open / close switch 303. Here, if the main document mode is not set, the main document mode switch (not shown) of the operation unit is pressed. In any case, if the document table 1 is not at the lower retracted position, the document table lower retracted operation is performed.
If the scanning unit 200 is not at the center home position, the movement operation of the scanning unit 200 to the center home position is performed.

When the scanning unit 200 is at the center home position, the open / close lock device 302 is released and the document table unit 35 can be pulled out. At this time, it is displayed on the operation unit that the document table unit 35 is ready to be pulled out. The operator uses the document table unit 35.
Front side of the document holding plate 14 by pulling out the document table unit 35 to the front side of the main body of the apparatus, and then releasing the stopper claws 15 and 16 of the left and right document pressing plates 14 from each other. To open it up (Fig. 1
2).

In this state, the operator puts the front cover and the back cover of the original document BO on the document table 1 with the front side reference, and tilts the document pressing plate 14 to put the front and back covers on the document pressing plate 14 respectively. Then, the document holder 1 and the document holder 1 are pressed so as to be sandwiched, and the stopper 15 of the document pressing plate 14 is hooked on the stopper 16 to be fixed (see FIG. 13).

After that, the operator opens the page where the reading of the original document is to be started, and presses the original table unit 35 with the scanner unit 30 while pressing the binding document portion near the binding part with one hand.
Push it in and put it in (set). When the open / close lock sensor 320 detects that the document table unit 35 is set in the scanner unit 30, the open / close lock device 302 detects the document table unit 35.
Is fixed at a predetermined position on the apparatus body. After that, the original table 1 is raised by the original table raising / lowering motor 61, and the original B
O is set at a predetermined reading position.

FIG. 28 is a perspective view showing this device. In FIG. 28, reference numeral 506 is a pressure plate for pressing the document. Further, FIG. 29 shows an operation state of pulling out the original table when the original document is set or when the original document is taken out of the present apparatus, and shows a state in which the original document BO is opened and set. That is, in this device, as shown in FIG.
The original document BO is set and removed while the document table unit 35 is pulled out from the apparatus main body.

Next, the TPS main document exposure method will be described. This apparatus comprises two fluorescent lamps 201 and 202 as light sources for exposing the original document, and two light sources for exposing the sheet original.
The fluorescent lamps 203 and 204 of the book are provided, and the inverter circuits for the two fluorescent lamps include the fluorescent lamps 201 and 202 for exposing the original document and the fluorescent lamps 203 and 204 for exposing the sheet original when reading the original document and the sheet original. It is switched on and off by a relay according to a control signal. Therefore, the present apparatus includes a fluorescent lamp light emitting circuit including a total of four fluorescent lamps and two inverter circuits. Two fluorescent lamps 2 as a light source for exposing the original
01 and 202 are arranged on both upper ends of the platen glass 205 arranged at the main document reading slit position in the direction perpendicular to the scanning direction of the scanning unit 200.

These fluorescent lamps 201 and 202 expose the main document BO from both the left and right sides through the platen glass 205 to eliminate density unevenness due to left and right pages of the read image and shade of the main document closing portion. On the other hand, the two fluorescent lamps 203 and 204 as the light source for exposing the sheet original are arranged in the scanning unit 2
00 is disposed below the sheet document reading slit position in the direction perpendicular to the scanning direction of the upper part of 00, and these fluorescent lamps 203 and 204 pass through the contact glass 206 on the upper surface of the apparatus and the scale 207 is placed on the contact glass 206. The sheet document SO set according to is exposed from both left and right sides. The fluorescent lamps 201 to 204 are CC-coupled by an inverter circuit so that reading density unevenness does not occur.
It is driven at 40 kHz in synchronization with the read image sampling of D.

The original document edge image detection circuit arranged in the IPU 103 samples the pixel data before the image scaling processing in the main scanning direction in the IPU 103 and detects the edge of the original document from the pixel data. The image detection circuit of the edge portion of the original document determines whether the edge portion of the original document is detected by the IPU 103.
Is instructed by the microcomputer in. IPU1
The microcomputer in 03 is a scanning unit 200
The scanning position of the main document edge image detection circuit controls the main document edge detection in the sub-scanning direction, and the pixel counter in the main scanning direction is referred to. Manage copy detection. Then, the microcomputer in the IPU 103 calculates the page suction position and main scanning direction image range of the main document from the end position of the main document detected by the main document end image detection circuit.

Next, the displacement of the original will be described. The left page portion of this manuscript increases due to the page turning operation,
Generally, the end of the original document moves upward and to the right with reference to the 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 generally moves downward and rightward with respect to the cover position. FIG. 30 shows an example of such a transition of the left end portion of the original document with respect to the number of repeated page turns. In FIG. 30, the position of the left end portion of the double-page spread original document placed is "0", and the amount of movement of the left end portion of the original document to the right, which is increased by the page turning operation, is represented by the displacement amount. There is. 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. 30 shows the thickness of this document is 20 mm and the total number of pages is 7.
The case of 50 pages is shown, and the size of the original document is a spread B4 size. As is clear from FIG. 30, generally, the left end portion of the original document is displaced to the right due to 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 monotonically increase. Further, since the central binding portion of the original document slides in the left-right direction due to the page turning, there is also a point where the displacement amount decreases conversely in the page turning process. These displacement amounts also depend on the size and thickness of the original document, the paper quality, and the like. When the cover of the original document is fixed on the platen as in the present apparatus, abrupt displacement of the back cover of the original document due to fluttering can be suppressed, but the top page position of the two-page spread original document changes due to page turning. This causes a deviation between the reading position and the page turning position.

Therefore, in this apparatus, the vertical displacement of the original document releases the restriction of the original table 1 every time the scanning unit 200 scans, and the original document is pressed against the scanning unit 200 with a spring property. The top of the document is automatically corrected so that it is even. In this device, the size of the original document is not limited to the standard sizes of A and B series,
In the spread direction of this document, the page shrinkage due to the bending of the binding portion often does not have a constant page aspect ratio. In addition, since this document is set on the front side of the center of the document, the page left, right, and top edges of the document differ depending on the size of the two-page spread document. The rear end position in the scanning direction changes.

Next, the detection of the end portion of the original will be described.
FIG. 31 shows the detection data of the right end of the two-page spread original document by the reading sensor. When the spread size is B4, the edge portion of the original document detected by the reading sensor is at a position about 180 mm from the center set position in the sub-scanning direction position. When turning the page after scanning the image,
Edge detection is started from the position of the black outer frame of the document table outside the maximum document size of the two-page spread original in the sub-scanning direction. The reading sensor 101 first reads the outer frame of the document table,
On a certain original, the step between the inside of the right cover and the page edge is read. Next, the reading sensor 101 reads the background density, which is the blank area of the top page, and generally reads the image after a margin of a dozen millimeters. Continuous data from the reading sensor 101 in the sub-scanning direction is sampled and compared with a threshold value to detect the beginning of a blank area,
That position is the right end position of the page in the sub-scanning direction of the document.

FIG. 32 shows an image detecting circuit for the edge portion of the document.
The image detection circuit for the end portion of the original document detects the right end portion of the original document in the sub-scanning direction based on the change in the read information by the specific pixel of the reading sensor 101 in the sub-scanning direction. The specific pixel in the main scanning direction of the reading sensor 101 corresponds to the minimum document size on the front side of the document placement standard, and thus is set to 1024 pixels which is 64 mm from the reference of the reading sensor 101 in front of the apparatus. 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 scan 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 outputs the AND of 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, an edge detection signal is generated and notified to the microcomputer in the IPU 103.

In the reading for detecting the end portion of the original document, the microcomputer in the IPU 103 causes the scanning unit 200 to start scanning to the left from the black original 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. The reading sensor 101 detects a striped pattern portion of the main document, which is continuous in the main scanning direction due to the edge of the paper, 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 is no character or image in the frame part of 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 white uniform color equal to or more than the threshold value. The accuracy of this determination can be improved by using the data of the pixels of the plurality of reading sensors 101 in the main scanning direction. Further, the number of pixels for the determination is set to three consecutive pixels by the D flip-flop circuits 404 and 405 and the AND circuit 406. Is also effective.

As a result of the above, when the end of the original document as shown in FIG. 31 is read, the end of the original document is detected as a point 180 mm from the home position. In the original document set based on the center binding portion, the image leading edge position 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 detection result of the end portion of the document in the sub-scanning direction is used by the microcomputer in the IPU 103 to calculate the page suction position and the page rising position for turning pages. Note that, at the time of scanning scanning of the original document, the left edge portion of the page of the two-page spread original document is similarly detected from the left side portion of the original table by the image detection circuit of the end portion of the original document. The detection result of the end portion of the original document in the sub-scanning direction is used by the microcomputer in the IPU 103 to determine the effective image range in the sub-scanning direction of the original document. For example, in copying, a resist for determining the image position on the transfer paper. Used for. Further, the detection result of the end portion in the sub-scanning direction of the original document is used by the microcomputer in the IPU 103 to automatically delete the image outside the predetermined range to prevent a useless black solid image. When applied to a system, it is used to reduce the amount of data and save memory.

Next, the detection of the end portion of the document in the main scanning direction will be described. FIG. 33 shows detection data of the upper end of the two-page spread original document by the reading sensor. When the spread size is B4, the edge portion of the original document detected by the reading sensor is at a position of about 270 mm in the main scanning direction position from the front set reference position. The scanning sensor starts scanning in the front direction from the position of the outer frame of the platen at the page suction and lift position when the page-turning scanning is stopped after scanning the original image, then the black outer frame of the platen The black platen is read on and the inside of the right cover is read for a certain original. Next, the reading sensor 101 reads the background density, which is the blank area of the top page, and generally reads the image after a margin of a dozen millimeters. The continuous data from the reading sensor 101 in the main scanning direction is compared with a threshold value to detect the beginning of a blank space, and the position is set as the page end position in the main scanning direction of the document.

FIG. 34 shows an end image detecting circuit for the main document in the main scanning direction. The detection of the end portion of the document in the main scanning direction is performed by the change in the read data of one line of the main scanning of the reading sensor 101. The two-page spread original document is set and fixed on the original document table 1 with the left end of the binding portion aligned with the center. 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, the reading in the main scanning direction from the reading sensor 101 is performed. Data is rearranged in 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 409 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. An edge detection signal is generated when three pixels continue in the main scanning direction. The counter 413 is an OR circuit 4
Although the number of pixels in the main scanning direction is counted by counting the clock CLOCK input through the counter 14, the counter 413 is masked and stopped by the detection signal from the AND circuit 412 being input to the OR circuit 414, and the counter 413 is stopped. Is notified to the microcomputer in the IPU 103.

In the reading for detecting the end portion of the main document in the main scanning direction, the reading sensor 101 reads in the front direction from the black main document table 1 on the back side or its outer frame portion, and the main document is read in the same manner as described above. Occurrence of page background is detected.
In addition, in this main document main scanning direction edge detection, the IPU 103
The microcomputer in the scanning unit 200 does not control the scanning of the scanning unit 200, the processing time is taken, and the scanning is performed when the scanning of the scanning unit 200 for adsorbing the page is stopped. Circuit 408, D flip-flop circuit 410,
Reset signal RESET to 411 and counter 413
Cancel.

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 image effective range in the main scanning direction of the main document having a relatively large irregular size. Images outside the range are automatically erased to prevent unnecessary black solid images, and when applied to a file system, etc., the image data is reduced by the detection signal at the end of the main scanning direction of this document to save memory. To do.

FIG. 35 shows an image forming section which is an image forming means of this apparatus. The image forming unit includes a printer main body 701 including a laser printer and a sorter 70 as a peripheral device.
2. A reversing unit 703 and a bank 705 having a double-sided unit and a large-volume sheet feeding tray 704.

In the printer main body 701, an image carrier composed of a photoconductor, for example, a photoconductor drum 706 is rotated by a driving unit and uniformly charged by a charger, and thereafter, image exposure is performed by an exposing unit including the semiconductor laser 105. A document image is written to form an electrostatic latent image, and the electrostatic latent image is developed by a developing device to become a visible image. Also,
Paper is fed to the registration roller from a selected one of the paper feed trays 707 and 708 and the large-volume paper feed tray 704 as paper feeding means, or the paper is manually fed to the registration roller from the manual feed table 709. The fed sheet is sent out by the registration roller and is transferred by the transfer charger 710 as a transfer unit to the photosensitive drum 70.
The visible image of No. 6 is transferred to the upper surface, separated from the photoconductor drum 706 by a separating charger 711 as a separating unit, and then the visible image is fixed by a fixing device 712 and sent to the reversing unit 703. In addition, the photosensitive drum 7
In 06, the residual toner is removed by the cleaning device after the paper is separated.

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 to the registration rollers. This paper is sent out by the registration rollers, and after the image is transferred and fixed on the back surface in the same manner as described above, it is discharged by the reversing unit 703 to the sorter 702 or the paper discharge tray as a double-sided copy.

In the reverse mode, the paper from the fixing device 712 is once sent to the double-sided reverse section 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.

This apparatus is provided with a scanner unit 30 having an upper scanning unit 200 and a document table unit 35 having a book document table 1 for pressing a lower spread book document, and the document table 1 can be pulled out. In this type, the main document table 1 is pulled out to the front side of the apparatus, and the main document is set on it. As shown in FIG. 36, the original document is set on the original document table 1 with the left end of the binding portion and the front side thereof as the reference. Then, the front cover of the original document is fixed to the left original plate and the back cover of the original document is fixed to the right original plate to prevent displacement of the uppermost page due to displacement of the shape of the binding portion during continuous reading of the original document. The procedure for setting this document is as follows.

The original table unit 35 is pulled out to open the original pressing plate.

The left cover of the original document is clamped by the left document table and the document pressing plate with the left end and the front side of the binding portion as references. The right cover of this document is sandwiched between the right document table and the document retainer. The page where the reading of the original is started is opened, the stopper claw 15 of the original pressing plate is hooked on the stopper claw 16, and the original table unit is set. In this apparatus, since the spread book document is set on the document table 1 with the center front side reference as shown in FIG. 36, the page left edge, right edge, and top end differ depending on the spread book document size. 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. 36, during page turning scanning after image reading scanning of the main document, the edge detection of the main document is outside the maximum main document size portion in the sub-scanning direction of the double-page spread document as described above. Starting from the position of the black platen outer frame,
Next, the black original plate portion is read, and the end portion is detected on the side of the two-page spread original document. In the detection of the edge of the document by the edge image detection circuit of the document, the read data of the specific pixel in the sub-scanning direction is continuously sampled, and the read image data is compared with a certain threshold value. A position where a pixel larger than the threshold value is repeated a plurality of times is defined as a page end position in the sub-scanning direction of the original document. From the detected page edge position, the IPU 103 calculates the page suction and lift position for turning the page, scans the scanning unit 200 to that position and temporarily stops it, and similarly at this position, the original document edge image. The detection circuit detects the edge of the original in the main scanning direction as described above.

The two-page spread original is set on the original table 1 with the central front side as a reference, and the page suction position, the rising position, that is, the image reading position is surely on the two-page spread original in the sub-scanning direction and corresponds to one line of main scanning. The read image data is sampled. The read image data for one line starts from the position of the black outer frame of the original plate on the far side of the maximum original size on the original plate 1, and then the image data of the spread original document on the black original plate 1. Appears. The detection of the edge of the document in the main scanning direction is performed by comparing the continuous read image data in the main scanning direction with a certain threshold, and the position where the read image data is larger than the threshold by a few pixels is determined. It is the page edge position of the document in the main scanning direction.

The IPU 103 calculates the position of the edge portion of the document from the read image data in both the main scanning direction and the sub scanning direction in the direction of the arrow in FIG. For example, when the spread size is B4, the left and right edge portions of the document are about 182 mm in the sub scanning direction from the center set position and about 257 mm in the main scanning direction from the front end. Scanning unit 20
0 starts scanning from the left home position at the start of reading scanning, and the read image data from a few mm before the end position of this document is stored in the memory 104.
Indicates the end of the document as the start position of the effective image area in the main scanning direction and the sub scanning direction when outputting image data.

In the detection of the page edge after the first page turning, the edge position of the uppermost page is accurately and stably performed by using the transmissive page sensor 214 which detects the page turning in the page turning conveyance. Since the cover of this document is fixed to the document table 1 in this apparatus, there is little deviation when scanning this document. Further, this manuscript tends to have little change in position due to turning one page. This device is used for detecting a page-turning page as shown in FIG.
4 is used. The page sensor 214 is the upper page guide 22.
7, a light emitting diode 214a is provided as a light emitting element, and a photodiode 214b is provided as a light receiving element below the lower page guide 228. Page transport path 418
The page guides 227 and 228 forming the
228a is provided, the light emitting diode 214a and the photodiode 214b are arranged obliquely with respect to the vertical direction of the detection position of the page conveying unit, and the paper dust generated by storing the page of the original document does not collect at the page sensor 214. It has a structure that falls downward. The page sensor 214 includes a page guide 227,
The page to be turned of the original document conveyed through 228 is detected after separating it by 1 page, and the detection accuracy is 1 mm due to variations in the detection accuracy regardless of the original document.
Very high within. Further, the page sensor 214 also serves as a sensor for detecting a jam of unstored and undischarged pages when turning a page.

The scanning unit 200 scans to the left after the reading of the double-spread original document BO and turns the page of the original document BO. The page locus at the time of storing a page is almost constant and is mechanically determined. The uppermost right page end portion 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 rises 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 turning page rises and is almost constant along the turning belt 200, and is determined by the mechanical layout. The page sensor 214 uses the page guides 227, 2 to turn the turning pages.
It is arranged in the vicinity of the entrance of the turning page storage section constituted by 28 and detects the turning page of the original document. The microcomputer in the IPU 103 has a position of the scanning unit 200 at the turning page storage start detection timing when the page sensor 214 detects the turning page, that is, the scanning unit 200 at the main document turning page storage detection position of the turning page storage section.
From the position of, the right edge position of the turning page when the turning page is on the original is calculated. Therefore, the microcomputer in the IPU 103 detects the page edge after separating one page by the page sensor 214 to accurately and surely determine the page edge position of the two-page spread original document in the turning start direction (right direction in this apparatus). Then, the rear end of the image effective range of the original document and the next page-turning position (the position change of the original document due to the page turning is extremely small) are calculated and corrected.

The control of the page suction position based on the above calculation result is performed as follows. This device has a suction width of about 20 mm which is lifted while the turning belt and the right end of the page are in contact with each other. The IPU 103 determines whether the original document turning page storage detection timing in the turning page storage section is earlier than the target timing.
Since the suction width is larger than the target of 20 mm, the timing of suctioning and ascending the page end portion in the turning start direction of the two-page spread original document is displaced in the early direction. For example, the IPU 103 estimates the suction width to be 22 mm when the turning-page storage detection timing is 2 mm earlier in distance, and changes the next page suction position by 2 mm to the right at the address of the scanning unit 200.

On the other hand, in the case where the main-page turning page storage detection timing of the page turning section is later than the target timing, the IPU 103 has a suction width smaller than the target 20 mm, so that the page end portion of the two-page spread original in the turning start direction is detected. Change the adsorption and rise timing to a slower direction. As a result, the page suction width is controlled to a constant value, and it is possible to prevent improper turning, erroneous turning of a large number of sheets, and damage to the original document, and a stable repetitive operation is performed.

When the scanning unit 200 is further scanned to the left after the turning pages are stored in the turning pages storage section, the two-page spread original document has the turning pages constrained at the center binding section.
While the page-turning page is being pulled by the binding portion, it is discharged from the page-turning page transport path in a U-shaped path. The trail of ejecting the page-turning is always substantially constant along the page-turning path and the pressing roller 281a. The microcomputer in the IPU 103 detects the turning page of the turning page from the scanning unit 200 at the detection timing of the discharge of the turning page of the turning page storage section by the page sensor 214, that is, the position of the scanning detection of the discharging of the turning page of the turning page storage section. It is calculated from the output signal of the page storage sensor 214 with the left end being the end to be placed on the upper left of the document. Therefore, the microcomputer in the IPU 103 detects the page edge after separating one page to accurately and surely detect the page edge position of the two-page spread original in the turning start direction (to the left of the apparatus). The leading edge of the effective image area of the original is detected and used as the next reading resist.

The microcomputer in the IPU 103 uses the calculated start position address A and end position address B of the effective image range between the right end portion and the left end portion 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 top spread page position of the two-page spread original is displaced by repeating the page turning, and
The displacement due to page turning is extremely small. Also, 1
Since the positional deviation of the uppermost page is 1 mm when the page 0 is repeatedly turned, the deviation of the image position (copy resist) is small. Therefore, the calculation of the page suction position of the original document is performed for a plurality of times of the page-turning scanning, for example, once for every page-turning operation of 10 pages, and the position data is updated to update the original document of the apparatus. The calculation processing and time for the page edge are reduced.

Next, the reference of the original image will be described.
FIG. 38 shows a part of the operation unit 99 of this device. Operation unit 99
Is an image reference designation key 609 for designating an image reference mode at the time of copying this document, and a light emitting diode 6 for displaying the state.
It is equipped with 10,611. The image reference positions include the center of the sheet (transfer sheet), the left edge of the sheet (left alignment), and the right edge of the sheet (right alignment). The light emitting diode 6
10 lights in the image reference mode in which the image reference position is left aligned, and the light emitting diode 611 lights in the image reference mode in which the image reference position is right aligned. The basic image reference mode in which the image reference position is the center of the paper is not displayed.

The default image reference position such as power-on, mode clear, main document reading mode selection, etc. is set as the center of the paper and is preferentially selected, so that the size detection error and the registration (position of the image formation itself) are performed. ) The image is prevented from being lost when a shift occurs, and the image position shift amount becomes inconspicuous without forming an image at the end. Further, the image reference position when the double-sided mode is selected is set to the left end or the right end of the paper and is preferentially selected, so that a margin for the binding margin is created as a standard.

As shown in FIG. 39, the operation section 99 has keys 634 to 636 for setting which of the left reference, the right reference and the whole image the image reference shift amount is set.
The image reference shift amount is set by the ten keys and the enter key. The image reference shift amount is effective only when the image reference mode is the left end or the right end of the paper, and the image is formed by being shifted from the paper reference. The image reference shift amount can be set in units of 1 mm from 0 to 20 mm, and the default setting value of the image reference shift amount is 0 mm.

FIG. 41 shows the page image range of the read spread book document, and FIGS. 42 and 43 show the layout of the page images in each book document image reference mode. FIG. 41 shows an example in which the vicinity of the center of the original document having the A4 size cover and a 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. In general, the pages of a two-page spread original document do not have a standard size because the image is shrunk by the binding portion even if the paper has a standard size. 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.

42 (a) to 42 (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. When the image reference position is at the left end of the paper as shown in FIG. 42A, the page end position in the scanning start direction of the spread book document is detected as described above, and the microcomputer of the IPU 103 detects the left end position of the page. By performing a read address operation of the frame memory 104 based on the length information of the transfer paper fed by the laser printer, the left end of the original is aligned with the leading end position of the transfer paper in the transport direction, and both pages of the double-page spread of the original are read. Is formed on one sheet of transfer paper, and the images on both spread pages are formed on the transfer paper in the left-justified manner as in a conventional scale-based copying machine.

When the image reference position is at the center of the sheet as shown in FIG. 42 (b), both page end positions in the scanning start direction and scanning end direction of the two-page spread original document are detected as described above, and the IP
The microcomputer of U103 manipulates the read address of the frame memory 104 by operating the scanning direction length information of the double-spread original document calculated from the detection position and the length information of the transfer sheet fed by the laser printer, and Two-page spread images are formed in 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.

When the image reference position is at the right end of the sheet as shown in FIG. 42 (c), 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 according to the page end position and the length information of the transfer paper fed by the laser printer, the right end position of the original document is aligned with the rear end position of the transfer paper in the conveyance direction. Both spread pages of the original document are formed on one transfer sheet.
As a result, the images of the two-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.

43 (a) to 43 (c) show sheet images in the independent page copying mode (independent page mode). The image reference positions in the independent page copy mode for copying the image of each page of the document onto the transfer paper are the left end of the paper, the center of the paper, and the right end of the paper. FIG.
When the image reference position is at the left end of the sheet as shown in FIG. 3 (a), the page end positions of the left and right pages of the two-page spread original document are detected to calculate the center binding position, and the IPU 10 is operated as described above.
The microcomputer 3 operates the read address of the frame memory 104 according to the page end position of the left page and the center binding part position, so that the page end position of the left page in the scanning start direction of the two-page spread original is the first transfer. The center binding portion position is aligned with the leading end position of the sheet in the transport direction, and the two-page spread pages of the original are formed on independent transfer sheets, respectively. 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.

When the image reference position is the paper center reference as shown in FIG. 43B, 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 set as described above. The microcomputer of the IPU 103 operates the read address of the frame memory 104 by operating the read address of the frame memory 104 according to the page edge position and the center binding position and the length information of the transfer paper fed by the laser printer, thereby scanning the double-page spread original document. The page end position and the center binding position of the left page in the start direction are aligned with the both ends of the first transfer paper, and the center binding position and the page end position of the right page are located with both the end parts of the second transfer sheet. The two facing pages of the original are aligned and formed in the center of the independent transfer paper. 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. 43 (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 as described above, and the center binding position is The frame memory 10 is calculated by the microcomputer of the IPU 103 based on the page end position and center binding position of the right page and the length information of the transfer paper fed by the laser printer.
By manipulating the read address of No. 4, the position of the central binding portion in the scanning start direction of the two-page spread original is aligned with the rear end of the first transfer paper, and the page end position of the right page is conveyed by the second transfer paper. The image of each page is formed right-justified on the transfer paper in line with the rear end position in the direction. As a result, a margin 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.

Next, the image range of the original document will be described. The reading sub-scanning direction range of the original document image and its arrangement method will be described with reference to the time charts of FIGS. 44 and 45. In FIGS. 44 and 45, 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, this 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, which is 420 mm, which is the maximum allowable size A3 of the document.
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 portion of the left original platen of the maximum size of the original document.

In the double-page spread copy mode of FIG. 44, the effective image range (determined by VFGATE) of the double-page spread 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 double-page spread original. The positional relationship is as shown. The microcomputer in the IPU 103 spreads VFGATE, and based on the end detection result of the original document, shrinks the binding portion of the original document to A3.
The size of 6614 lines is calculated as 6400 lines. 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. I
The microcomputer in the PU 103 uses each PFGAT
The range of E 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 VFG
FH of white data is transmitted to the printer by using each image data outside the ATE 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 uses the value 6400 in the page range (VFGATE) from the value of the counter that counts the number of image lines.
The image data after the end of the line is white data.

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 center of the page 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 determines the difference 2 between the value of the counter for counting the number of image lines and 6400 lines of the page range (VFGATE) and 6614 lines of the image range of the transfer paper (PFGATE2).
107 lines, which is half of 14 lines, is provided as a margin part in front of VFGATE, and a margin part is provided from the end point of 6400 lines of VFGATE.
Let FGATE2 finish.

PFGATE3 is a PFGATE in the mode in which the image reference is the right edge 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 right edge of the page is aligned with the rear edge of the transfer sheet. Send so that a margin is created at the tip of. As the image arrangement, the microcomputer in the IPU 103 determines a difference 514 between the value of the counter that counts the number of image lines and 6400 lines of the page range (VFGATE) and 6614 lines of the image range of the transfer paper (PFGATE2).
A line is provided as a blank area in front of VFGATE.

FIG. 45 shows the image range in the independent page copy mode. As in the case of FIG. 44, the effective image range (VFGATE) of the double-page spread of the cover size A4 has a positional relationship as shown in the figure with respect to the read image data storage range of the frame memory 104 according to the edge detection result. The microcomputer in the IPU 103 sets VFGATE to 6 based on the contraction of the binding portion of the book document based on the detection result of the edge of the book document.
Calculated as 400 lines, half of which is 3200
The position of the line and the center binding portion is calculated as the middle of the range of VFGATE.

Further, in the mode in which the image reference is the left edge 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 data. Further, the microcomputer in the IPU 103 arranges the spread right page image in the transfer paper image range {PFGATE1 (R)} of A4 size 3307 lines, and transfers the image data from the frame memory 104 to the printer at the second transfer position of the binding portion. The paper is fed so that a margin is similarly formed at the rear end of the transfer paper so that it is aligned with the front end of the paper.

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 range {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. As the image layout in this case, the microcomputer in the IPU 103 determines from the value of the counter that counts the number of image lines, 3200 lines of the page range (VFGATE) and 3 of the image range of the transfer paper {PFGATE3 (L)}.
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.
The image data is arranged in the 7-line transfer paper image range {PFGATE3 (R)}, and the image data from the frame memory 104 to the printer is adjusted so that the right page end position is aligned with the rear end of the second transfer paper and is similar to the front end of the transfer paper. Send so that margins are created.

As described above, the microcomputer in the IPU 103 controls the write 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. .

46 and 47 show the copy operation timing in the main document mode of this apparatus. 46 and 47 show the case where the end portion of the original document is detected by the page storage position in the middle of the continuous copy mode. In FIGS. 46 and 47, pages 2 and 3, and pages 4 and 5 compose a double-page spread of this document. Further, the symbols RP and LP of the read signal memory R of the frame memory 104 represent the cases where the read image data are for the right page (RP) and the left page (LP), respectively. Furthermore, the page size of the original document in each mode is A
Scanning unit 200 for 2 pages of double-page spread
The image data is continuously read by one scan of the image data and the read image data is stored in the frame memory 104 as read data of A3 size. The image data is read from the frame memory 104 according to each output mode and Image and record on transfer paper.

FIG. 46 shows a case of a one-to-one copy mode in which an image of a book document in a spread state is output on an A3 size transfer sheet and one copy is made on the book document, and FIG. 47 shows an A4 size document. The case of the one-to-one copy mode in which the images of the left and right pages of the original document are separately output on the transfer paper for each independent page and a copy of the original document is similarly copied is shown.

When the print key instructing the start of copying on the operation panel 99 is turned on at the first original document mode operation timing, the microcomputer in the IPU 103 causes the scanner motor 106 for scanning the scanning unit 200 to rotate in the reverse direction. 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 processes the image data from the VPU 102 as read image data from the end of the left page of the original document and generates an effective image area signal SFGATE in the reading sub-scanning direction. Further, the microcomputer in the IPU 103 operates the data write signal memory W of the frame memory 104 by the effective image area signal SFGATE to control the data write range. The microcomputer in the IPU 103 recognizes the center point of the binding portion of the double-page spread original from the control address of the scanner motor 106, and reads this at the reference position of the second image in the independent page output mode or the read image in the double page output 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 of the double-spread original document, the microcomputer in the IPU 103 starts detecting the right page edge of the original document and calculates the page suction position when turning the page. When the scanning scan of the scanning unit 200 is completed, the scanning unit 200 enters the backward page-turning scan, and the storage position of the page-turning page is detected for the first time, and the effective range of the image is determined by the page storage position. Image formation is started. 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 is an effective image area signal PFGA in the sub-scanning direction on the laser printer side.
The data read signal memory R of the frame memory 104 is operated by TE to output image data in synchronization with the laser printer. Further, at the time of turning a page, the page 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, and double-page spreads of the manuscript are copied.

FIG. 47 shows the case of the one-to-one 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. 46, and at the time of page turning, 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. Then, the image data for each page of the original document is output. The address counter of the frame memory 104 is masked by PFGATE and stopped, so that the data of the second image on the right page connected to the image on the left page of the original document becomes the second PFGATE.
The signal is read with a transfer sheet interval in the laser printer.

This apparatus performs a stable page turning operation against the 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 edge of the original is detected by the page sensor during the page-turning scanning of the original, and suction is applied to the page-edge of the original that changes due to repeated page-turning.
The operating position of the separation is determined. In other words, the page end portion on the scanning end side is detected from the data of the page storage position, the rising position of the suction roller at the time of page turning scanning is determined, and the same amount of pages is always controlled to be sucked and separated. Next, the operation unit will be described. FIG. 40 shows a part of the operation unit 99. The operation unit 99 has a reading for selectively setting a sheet original reading mode for reading a sheet original on the contact glass 206 and copying it and a main original reading mode for reading and copying a main original on the original table 1. Selection key 60
1 is provided, and the sheet original reading mode and the main original reading mode are alternately set every time the reading selection key 601 is pressed.

Further, as shown in FIG. 38, a double-sided designation key 602 for designating a double-sided copy mode at the time of copying the original document and light-emitting diodes 603, 604 for displaying the designated mode are provided in the operation section 99. 605 is provided. The double-sided copy mode includes (1) original double-sided copy mode, (2) double-page spread double-sided copy mode, and (3) automatic double-sided copy mode. Each time the double-sided selection key 602 is pressed, the original double-sided copy mode, double-page spread double-sided copy mode. The automatic double-sided copy mode is sequentially and repeatedly switched and designated, and the light emitting diodes 603, 604, and 605 for displaying the designated mode are sequentially turned on.

At the time of default such as power-on, mode clear, main document reading mode selection, etc., the main control board 107 releases all the double-sided modes and selects the single-sided copying mode. The main control board 107 enables the original double-sided copy mode, double-page spread double-sided copy mode, and automatic double-sided copy mode in the independent page mode for independently copying the image of each page of the original document. In the double-page spread mode for copying a double-sided spread page, only the selection of the original double-sided copy mode is enabled, and double-sided spread page copying is performed in which an image is formed on the front and back sides of the sheet for every two-page spread of this document.
Further, the main control board 107 validates only one double-sided copy mode in the sheet original reading mode, and when the original double-sided copy mode is selected, each original is replaced and the front surface of the original is changed every time the print key is pressed. Double-sided copying in which each image on the back side is sequentially copied is repeated.

The operation section 99 is composed of the operation section shown in FIG. 38, and an operation panel and display panel (not shown). The operation panel is a print key other than the operation unit shown in FIG.
Operation keys such as the 0 key are provided, and the display panel has a display section for performing various displays. 38, 39, 40
Indicates a main part of the operation unit 99, which mainly sets and displays the copy mode of the main document. As shown in FIG. 38, the operation unit 99 includes a key 606 for selectively setting the sort mode and the stack mode of the sorter 702, and light emitting diodes 607, 6 for displaying the setting mode.
08 is provided, and each time the key 606 is pressed, the sort mode and the stack mode are set alternately.

The operation section 99 also has a key 612 for setting a center erasing mode for erasing an image of a binding portion designated width with reference to the center of the two-page spread original, and a light emitting diode 613 for displaying the setting state. , A key 614 for setting each erasing mode for erasing the image of the specified outer frame width based on the original document, a light emitting diode 615 for displaying the setting state, and the transfer paper with its image side facing up. A key 616 for setting the front surface discharge mode and a light emitting diode 617 for displaying the setting state are provided.

The operation unit 99 also has a copy format selection key 618 for selectively setting the independent page mode and the spread page mode, and light emitting diodes 619, 620 for displaying the setting mode. Selection key 61
Each time 8 is pressed, the independent page mode and the spread page mode are set alternately. Further, the operation unit 99 is a page limiting key 621 for selectively setting a right page limited mode for copying only the double-page spread right page and a left page limited mode for copying only the double-page spread left page, and a selection state thereof. The light emitting diodes 622 and 623 for displaying are displayed, and the right page limited mode and the left page limited mode are alternately set each time the page limited key 621 is pressed.

The operation unit 99 also has a key 624 for increasing / decreasing the zoom magnification, a key 625 for independently setting the magnification, and a page number setting key 6 for setting the number of pages to be copied.
26, copy start page setting keys 628 and 629 for setting the copy start page of the two-page spread original to the left page and the right page, respectively.
Have. Further, as shown in FIG. 39, the operation section 99 has keys 630 to 633 for setting a center erase width, an upper erase width, a lower erase width, and a left and right erase width of the original document. Is set by the ten keys and the enter key.

Next, the guidance display will be described.
The display of the operation guide and the warning of the present apparatus is performed by the display unit which is arranged in the operation unit 99 and includes a liquid crystal panel capable of displaying characters in two columns of 20 digits, and FIG. 48 shows the guidance display. FIG. 48 (A) shows a general display during the copying of the original document by the guidance display section of the liquid crystal panel. The display content is the reading of the original document, the copy magnification is the same size, and pages 15 to 48 on the right page of the spread. The settings up to indicate that copying is being performed on page 24. The guidance display section displays the reading selection mode in the upper left, the copy magnification in the upper right, the set number of pages in the lower left, and the number of pages being copied in the lower right.

FIG. 48B shows a general display on the main document copy standby state by the guidance display portion of the liquid crystal panel. The display content is the main document reading, the copy magnification is the same magnification, and the spread page mode is the total. When the number of pages is set to 40, the number of pages being copied is not displayed at the lower right because copying is not started. As described above, in the present apparatus, the operation unit 99 is used to input a page for instructing the copy start page and copy end page of a two-page spread original, or the number of image forming pages based on the total number of pages, and the setting contents are displayed on the operation unit 99. Then, the operator confirms the set number of pages and corrects it with the operation unit 99. Further, even when the operator sets the original document by opening the copy start page, the operator opens the original document by viewing the display of the operation unit 99 after setting the page number. The set number of pages is displayed on the operation unit 99 at the standby time before the start of the copying operation and at the end of the reading of the original document. The set number of pages and the number of pages in the copying operation are displayed by the operation unit 99 during reading and copying of the original document.

In this apparatus, the operation of reading the original document, forming the image of the read page on the paper, and turning over the pages of the original document is continuously performed automatically after the operation is started. The set number of sheets and the number of pages being executed during reading or copying of the original document are displayed on the operation unit 99, and the operation unit 99 notifies the operator of the status and progress of the operation. Further, the present apparatus suspends or stops the operation on the execution page by pressing the stop key.

FIG. 48C shows a general display during copying of a sheet original on the guidance display portion, and the display content indicates that the sheet original is read and the copy is the same size. FIG. 48 (D) shows a state in which the guidance display section gives an alarm and warns when the read image data exceeds the storage range of the memory 104 when the original copy is enlarged.

Next, the mode control flow will be described. FIG. 49 shows a control flow in the copy format selection mode. This control is performed by the main controller (main control unit) that controls the image forming mode, and the IPU controller (controller of the IPU 103) controls reading of the original image, data processing, and page turning according to the command. The sequence controller (sequence control unit) also controls the timing of the load on the image forming unit.

The copy format mode is effective in the original reading mode, and includes (1) independent page mode and (2) spread page mode. These modes are switched by pressing the copy format selection key 618 in the operation unit 99, and the selection is displayed by the light emitting diodes 619 and 620. In this apparatus, priority is given to the copy format mode, and the first setting is the (1) independent page mode in which one page of the original document is formed on one transfer sheet, which is frequently used. Further, the initial setting of the copy format mode when the power is turned on or when the main document reading mode is selected is (1) independent page mode.

As shown in FIG. 49, the main controller sets the copy format counter to 1 when the power is turned on and increments the copy format counter each time the copy format selection key 618 is pressed, and the copy format counter becomes larger than 3. Sometimes the copy format counter is set to 1. And the main controller has a copy format counter of 1
In the case of, the light emitting diode 61 is set to the independent page mode.
9 is turned on, and when the copy format counter is 2, the spread page mode is set and only the light emitting diode 620 is turned on.

When the independent page mode is designated, the main controller reads the read page image of the two-page spread original from the frame memory 104 for each page as shown in FIG.
Form on the page transfer paper. As for the image alignment, the page image position is calculated from the page edge detection position as described above, and the page image position is arranged on the transfer paper. On the other hand, when the spread page mode is designated, the main controller continuously reads the read image information of both pages of the spread book document from the frame memory 104 to form one page of transfer paper.

Generally, books and books are bound with double-sided printed matter, and there are also bound with double-sided originals such as stapler stoppers for office documents and files. In this apparatus, which scans these originals and forms the images of the read pages on the transfer paper, and turns the pages of the originals, in this apparatus, an independent page mode in which an image for each page of the originals is formed on one sheet of paper, By providing the double-page spread mode in which the images of both double-page spreads are formed on one sheet of paper, a copy having a different image forming form can be obtained. In particular, the independent page mode has the same page structure as the original document. In the double-page spread mode, the number of copies is halved,
An image across a double-page spread such as gravure is formed as a continuous image.

Further, this apparatus reads the two-page spread image of the original document by one scanning, writes the read image data in the frame memory 104, divides the read image data into the image range of each page, and divides the read image data into the frame memory. The image is read out from 104 to form an image on one page of the sheet, or the read image data is spread from both sides of the page and read from the frame memory 104 to form one page of the sheet, and the image is read once regardless of the image forming mode. The same control is performed by directional scanning.

Next, the copy mode and function will be described. The copy mode, input keys and their functions of this apparatus will be described below with reference to FIGS. 1. Common copy mode key (key commonly used in each copy mode of operation unit 99) (1) Sort / stack key 606 (2) Paper selection key (3) Copy density adjustment key (4) Automatic Key for setting density (5) Numeric keypad (6) Mode clear / preheat key (7) Decimal key (8) Clear / stop key (9) Numerical confirmation / enter key (10) Interrupt key (11) Start key (print Key) 2. Semi-common copy mode key (1) Independent variable magnification key Independent variable magnification range 71% to 1 in both main and sub scanning directions
Key 625 that sets 1% pitch in the range of 41% (2) Zoom key Key 624 that sets the zoom range in 1% pitch in the range of 71% to 141% (3) Reduction / enlargement / magnification key With fixed scaling Copy magnification of 71, 82, 87, 93, 11
Keys set to 5, 122, 141% (4) Character / Photo / Character photo key A key to switch the mode of Character / Photo / Character photo by using multi-bit frame memory and perform gradation processing of image data. The above functions are the same as those of the conventional copying machine.

3. New copy mode (new copy mode of this device) (1) Duplex mode ○ Single-sided copy mode (default) Front and back page mode The original and front and back images are formed on both sides of the paper.

The high-speed double-sided copy mode is limited to the one-to-one double-sided mode, the page order of the image data is exchanged using the frame memory 104, the image on the right page is formed on the surface of the first transfer sheet, and the double-sided conveyance path is formed. And then turn the pages of this manuscript.
The image on the right page is formed on the front surface of the second transfer paper and conveyed by the double-sided conveyance path, the first transfer paper is re-fed, and the image on the left page is formed on the back surface of the second transfer paper to perform the first transfer. Eject the paper. When the number of copies is "2" or more, the transfer sheets are once stacked on the double-sided tray and are not conveyed by the high-speed double-sided path.

Spread Left / Right Page Mode Images of the spread left / right pages of this document are copied on the front and back sides of transfer paper. Page claw mode Copies the image of the copy start page of the left and right pages of this document from the surface of the transfer paper. Therefore, when the right page is designated as the copy start page, both sides of the front and back pages are copied, and when the left page is designated as the copy start page, both sides of the two-page spread are copied.

When the sheet original reading mode is selected, only double-sided copying of front and back pages is valid, and normal single-sided original double-sided copying is performed. (2) Erase mode Center erase mode (default: Yes) Detects the position of the original and erases the image of the specified width of the binding with the center of the two-page spread original as the reference.

Frame deletion mode (default: Yes) The size of the original is detected and the image of the specified width of the outer frame (upper, lower, left and right) is erased based on this original. To cancel the erasure of the upper, lower, left and right widths independently, set the erase width to "0". Images outside the size of this document are normally automatically deleted.

(3) Reference mode ○ Center mode (default) Copy is performed on the center of the transfer sheet in the sub-scanning direction on the basis of the transfer sheet. The image shift in the sub-scanning direction is performed by detecting the page length of the original document and placing it on the transfer paper. Right alignment mode Copies from the right side of the transfer paper to the set shift amount position with reference to the transfer paper.

Normally, the binding margin is formed on the left side of the transfer paper by the shrinkage of the binding section. Left alignment mode Copies from the left side of the transfer paper to the set shift amount position with reference to the transfer paper. When the seat mode is selected, the alignment is always right. This is also effective in the double-page spread mode, and images are arranged on the transfer paper according to the length of both pages of the double-page spread original.

(4) Page limited mode ○ Both page mode (default) Both right and left pages are copied. Effective in independent page mode. Right page mode Copy only the right page of the two-page spread document. Used when copying single-sided originals such as files.

Left page mode Only the left page of the two-page spread original is copied. (5) Copy format mode Independent page mode (default) The double-page spreads of this document are copied for each page.

Spread Pages Mode Both spread pages of this document are copied as they are. For double-sided copying of a double-page spread in which both the first double-page spreads are copied on the front surface of the transfer paper and the second double-page spreads are copied on the back surface of the transfer paper, only the double-sided front / back page mode is selected for the double-page spreads.

(6) Paper ejection selection mode ○ Back surface ejection mode (default) Since this original is read in page order, the transfer paper is ejected with the back surface ejection and the image side facing downward during normal one-sided copying. Front-side ejection mode Specify this when the number of originals is small or when checking images, and eject the transfer paper without inverting it. It can be specified even when the seat mode is selected. The transfer paper in the double-sided copy mode is discharged without inverting the transfer paper regardless of the setting.

(7) Page number setting input mode Start-end page mode The number of pages from the copy start page to the copy end page is calculated, and the difference page is copied. Copy Page Number Mode Repeats the specified number of pages from the specified left or right page of this document. In this case, it is not necessary to input the copy page in the start-end page input mode.

This is because when the number of pages is not attached to this manuscript,
Used when the page is skipped. The number of pages setting method is 1. Select the copy page number input mode with each mode key, and 2. Enter the value on the copy page using the numeric keypad and 3. Confirm with Enter key. Normally, one page of this original is counted as one page, and when copying only the right page or the left page, it is regarded as a single-sided original and the copied page is counted as one page.

(8) Copy start page input mode Left page mode In independent page mode, copying is started from the left page of the document. Right page mode In independent page mode, copying starts from the right page of the original. This is also specified when each double-sided copy mode is selected. In the double-sided copy mode, the first page and the last page are automatically discharged as blank pages by setting the copy start page and the number of pages. When outputting a double-page spread, the first and last half-page designations (half-size erasure) cannot be performed.

(9) Reading selection input mode ○ Main document reading mode (default) In the lower side reading, the main document is read and automatic page turning is performed. Sheet document reading mode Scan the sheet document in the upper side reading. Specify when copying a sheet document or the cover (hard cover) of this document.

4. Quantity setting mode The quantity setting method is 1. Select the amount setting mode with each mode key, 2. Enter the set value with the numeric keypad, and 3. Confirm with Enter key. (1) Erase width setting mode Center mode (default: 10 mm) The erase width is set in 1 mm units from 0 mm to 40 mm based on the original. In the independent page mode, the binding part erasing width of each page is half this width.

Upper mode (default: 10 mm) The erasing width is set in units of 1 mm from 0 mm to 30 mm based on the original. Lower mode (default: 10 mm) Set the erase width in 1 mm units from 0 mm to 30 mm based on the original. Left / right mode (default: 10 mm) Set the erase width in 1 mm units from 0 mm to 30 mm based on the original. The left and right edges have the same amount, and the center erase width has priority in the independent page mode.

(2) Reference shift amount setting mode Left reference mode (default: 0 mm) The position (shift amount) from the left side of the transfer paper is set in units of 1 mm from 0 mm to 20 mm. Right reference mode (default: 0 mm) From 0 mm to 20 mm, set the position (shift amount) from the right side of the transfer paper in units of 1 mm.

(3) Full image mode The image is copied on the entire surface of the transfer paper without erasing the image outside the original size. This is used when the size of the original document in the main scanning direction is unknown, and is effective when the frame erasing mode is canceled. Image data outside the reading scanning range in the sub-scanning direction is white data.

Next, the operation of the TPS system will be described. A. TPS operation mode (1) Reading mode Main document reading mode The mirror 222 is released, the lower fluorescent lamps 201 and 202 are turned on, and the scanning unit 200 is scanned rightward after the shading correction at the left home position to scan the spread original document. Are read at once and the read image data is stored in the frame memory 104.

Sheet Original Reading Mode The sub first mirror 222 is inserted in the optical path, and the upper fluorescent lamp 20 is read.
3, 204 is turned on, the shading correction is performed at the left home position, the scanning unit 200 is scanned in the right direction to read the sheet original, and the read image data is stored in the frame memory 104.

(2) Return Mode Page Turning In the original reading mode, a high-voltage bias is applied to the turning belt 208, the scanning unit 200 is scanned leftward, and the turning belt 208 reaches the right end of the two-page spread original. Stop at that point, raise the turning belt 208,
0.5 sec. After that, the scanning unit 200 is scanned leftward. The right edge and the upper edge of the two-page spread original are detected from the image read by the reading sensor (CCD), and the initial page suction position and the image effective range in the main scanning direction are calculated. Further, when the page is turned, the position of the right end portion and the left end portion of the two-page spread original document is detected by the page sensor of the page conveying path, and the image effective range in the sub-scanning direction is calculated. Scanning Unit Return In the sheet document reading mode, the scanning unit 200 is scanned leftward.

(3) Homing mode When the power is turned on normally, the original table is lowered to scan unit 2
Retreat from 00. The scanning unit 200 is scanned and set at the center home position. (4) Pre-scanning mode The scanning unit 200 is scanned to the left home position to prepare for shading correction and reading. (5) Post-scanning mode After the return operation is completed, the scanning unit 200 is scanned and set at the central home position, and the document table is lowered and retracted from the scanning unit 200, so that the original document can be taken out.

FIG. 50 shows the copying operation timing of the main document mode (main document reading mode) of the present apparatus, in which the edge of the main document is detected by the image in the initial mode from the press of the print key on the operation panel 99. Indicates the case. In FIG. 50, page 2 and page 3, page 4 and page 5 form the double-page spread of this document. In addition, the frame memory 10
Reference numerals RP and LP of the read signal memory R of No. 4 indicate that the read image data is for the right page (RP) and the left page (LP), respectively. Further, two double-page spreads of this document are continuously read by one scan of the scanning unit 200, and the read image data is read by the frame memory 104.
The data is stored as read data of A3 size inside, and image data is read from the frame memory 104 according to each output mode, imaged by a laser printer, and recorded on transfer paper. FIG. 50 shows a case of a one-to-one copy mode in which an A3 size original document image is output on an A3 size transfer sheet and a copy of the original document is copied.

When the print key for instructing the start of copying on the operation panel 99 is turned on at the operation timing of the original mode shown in FIG. 50, the microcomputer in the IPU 103 causes the scanner motor 106 for scanning the scanning unit 200. The scanning unit 200 located in the central portion of the apparatus is rotated in the reverse direction to move 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 so that the scanning unit 200 moves to the right, and turns on both fluorescent lamps 201 and 202. Then, the scanning for reading the original document is started.

The microcomputer in the IPU 103 regards the image as a document image from the left page end point of the two-page spread document and reads the effective image area signal SFGATE in the sub-scanning direction.
Occurs. Further, the microcomputer in the IPU 103 operates the data write signal memory W of the frame memory 104 by the effective image area signal SFGATE to control the data write range. The microcomputer in the IPU 103 recognizes the center point of the double-page spread original binding part from the control address of the scanner motor 106 and sets the reference position of the second image in the independent page mode or the read image in the double-page mode to the center of the transfer paper. Used when forming.

When the scanning unit 200 reaches the right page edge of the two-page spread original, detection of the right page edge of the original is started, and I
The microcomputer in the PU 103 calculates the page suction position when turning the page. When the reading scan of the scanning unit 200 is completed, a backward page-turning scan is started, and the laser printer starts image formation for the first time after the effective image range is determined by the page storage position. That is, the microcomputer in the IPU 103 calculates the position of the right edge of the page on the original document from the scanning position of the scanning unit 200 at the time when the page sensor of the page turning detection starts, and calculates the right end position of the page from the page storage shape. From the scanning position of the scanning unit 200 at the time of detection of discharge by the page sensor, the position of the left end portion of the page on the original document is calculated from the page storage shape of the apparatus.

In the second and subsequent times, the laser printer starts image formation immediately after the end of scanning and scanning within the image effective range calculated from the previously detected page storage position. The data reading signal memory R of the frame memory 104 is generated by the effective image area signal PFGATE in the sub-scanning direction on the laser printer side.
Is operated and image data is output from the frame memory 104 in synchronization with the laser printer. Further, at the time of turning each page, the page sensor repeatedly detects the page edge of the two-page spread original. By repeating the above steps, the double-page spread of the original document is performed while automatically turning the pages of the original document.

This apparatus performs a stable page turning operation against the displacement of the suction roller. This is because the suction position is important because only the leading edge of the page is sucked, displaced upward and guided to the page storage section. As described above, the page sensor detects the page edge of the document during page-turning scanning, determines the page suction / separation position for the page edge of the document that changes due to repeated page-turning, and It is controlled so that suction / separation with a specified width is performed.

Next, the movement of the document table and the image memory range will be described. FIG. 51 shows the movement of the document table 1. During reading of the original document BO, the left and right original document tables 1 are independently pressed so that the double-page spread of the original document BO is kept flat as described above. The left manuscript table 1 only moves up and down by turning the page according to the thickness of the left page of the two-page spread manuscript. The right manuscript table 1 moves up and down by turning the pages according to the thickness of the right page of the two-page spread manuscript, and the left and right manuscript tables 1 at the spine cover part of the manuscript.
Are joined, and the spine cover portion of this document is displaced so as to rotate around the right end portion of the left document table 1 as the pages are turned.

FIG. 52 shows a two-page spread original document and an image memory range (image data storage range of the frame memory 104). In the original document BO, the spread left pages are stacked each time the pages are turned, and the left uppermost page is displaced rightward in an inclined manner.
On the other hand, the double-page spread right page of the original document BO is displaced to the right by turning the page, but returns to the initial position by the rotation of the spine cover. Further, the spread left page is pulled by the curved portion of the binding portion and is displaced rightward.

As a result of the simulation, the amount of displacement of the right page of the spread is 14.5 mm at maximum when the size of the original document is A4 and the thickness of the original document is 40 mm. 53 to 59 show the simulation results of the movement of the rightmost top page of this document.
Shows the movement of the rightmost top page of the original document when the original document size is A4 and the thickness of the original document is 40 mm. 54 shows the movement of the uppermost right side page of the original document when the original document size is A4 and the thickness of the original document is 30 mm, and FIG. 55 is the right side of the original document when the original document size is A5 and the original document thickness is 30 mm. The movement of the top page is shown.

FIG. 56 shows the movement of the right uppermost page of the original document when the original document size is B6 and the thickness of the original document is 30 mm. FIG. 57 shows the original document size A4 and the original document thickness is 20 m.
The movement of the rightmost top page of this document in the case of m is shown.
FIG. 58 shows the movement of the uppermost right page of the original document when the original document size is A4 and the thickness of the original document is 10 mm.
Indicates the movement of the uppermost right page of the original document when the original document size B5 and the thickness of the original document are 30 mm.

As described above, since the left original platen 1 on which the left cover of the original is fixed is fixed in the reading scanning direction and only moves up and down, the spread left page is the first page, that is, the left side of the left cover. It is never displaced. Further, when reading the original document, the original document is scanned from below from the scanning unit 200.
Since the original document is brought into contact with the scanning unit 200 by scanning to scan the scanning unit 200, the page bundle of the original document is urged to the downstream side in the scanning direction.

The present apparatus is provided with the frame memory 104 as an image memory for storing image data as described above, and the image memory 104 is used for the following purposes. First, the image memory 104 serves as a speed buffer for reading a document and forming an image, and performs stability of contact reading by the scanning unit 200 of the document and document protection. Secondly, the image memory 104 is used for protecting the original and improving the productivity of copying by repeating copying by reading the original once. Thirdly, the image memory 104 is used as a copy page layout for determining the page position for the first time and cutting out an independent page.

As shown in FIG. 52, the range for storing the main document image data in the image memory 104 is centered around the binding portion of the main document, and at the copy magnification equal to or smaller than 1 ×, the maximum original spread A3 size image of the main document. It is an area for storing data.
The image memory 104 is VP just before the area.
The storage of the image data from U102 is started by the IPU 103, and the surplus portion of the image memory 104 is arranged in the right direction.

Next, page displacement compensation will be described. First, the size of the image memory 104 will be described. The image memory 104 is 16 MByte (128 Mbit:
To be precise, it has a storage capacity of 134, 217, 728 bits), and 4 bits / do after image processing from the VPU 102.
The image data of t is stored in multivalue. Therefore, the image data storage range of the image memory 104 is slightly larger than the A3 size.
Here, 16MByte is 33,554,432dot
(134,217,728 bit / 4), A3 size is 30,953,520 dots (4680 dots ×
6614 lines), and the remainder of the image memory 104 is 2,600,912 dots.

The remainder of the image memory 104 is 555 lines, and since one line of the image memory 104 is used for storing white data for image deletion, the image memory 1
The effective remainder of 04 corresponds to 35.1 mm. This A3
The size +35.1 mm is the image data storage range of the image memory 104, and the remainder of the image memory 104 is used as a page movement amount due to the thickness of the original document with respect to the maximum spread size A3 of the original document. In the present apparatus, as described above, the image memory 104 has a maximum spread size A3 of 1
In addition to pages, an image data storage range of 40 mm or less for the maximum original document thickness (binding portion movement amount) is provided as a surplus portion. Here, one page of the maximum spread size A3 of the main document is twice the adaptive maximum page size, that is, twice the maximum cover length in the sub-scanning direction of the main document. The maximum page length is less than or equal to the maximum cover length in the sub-scanning direction.
The extra portion is used as compensation for page displacement of the original document.

Next, the page displacement amount of this document will be described. The maximum permissible book thickness is 40 mm, and the binding position of the book is displaced to the right every time the page is turned, and the right end of the right page, which is the last part of the reading scan, is also displaced. In addition, since the left cover of the original document is fixed in the scanning direction and the binding portion is rotated, the displacement of the right end position of the double-page spread right page is equal to or less than the thickness of the original document. From the result of the numerical simulation of the right end position of the book spread, the maximum value of the displacement of the right end position of the right page of the book spread is 14.5 mm in absolute value when the book size is A4 and the book thickness is 40 mm. The maximum value of the displacement of the right end position of the right page of the double-page spread is small irrespective of the size of the original when the thickness of the original is small. That is,
The image memory 104 has a surplus of 35.1 mm,
There is a margin of 35.1-14.5 = 20.6 mm at the same size copying (one size reading), the image data storage range at the same size copying is satisfied, and the page displacement amount is compensated. Also, the image memory 1
In the case of 04, reduction copying (reduction reading) has more margin.

On the other hand, when performing enlargement copying (enlargement reading) of a small-sized original, the surplus of 35.1 mm in the image memory 104 is reduced due to the magnification change, and 141% of the maximum magnification is within the original image range. Since 35.1 / 1.41 = 24.9 mm is equivalent and the displacement amount of the page position does not depend on the size of the original document, the margin of the image memory 104 is 24.9-14.5 = 10.5 mm at the time of maximum enlargement copying. Thus, the page displacement amount is compensated by satisfying the image data storage range of the image memory 104 even at the time of maximum enlargement copying.

In this apparatus, in addition to the compensation of the page displacement amount of the main document as described above, the above margin is used for the accuracy variation between machines and the resist adjustment. In this apparatus, as shown in FIG. 52, in the image memory 104, the precision variation between machines and the portion for resist adjustment are distributed in the scanning start direction and the scanning end direction respectively, and the image data storage start position is the maximum size of the left page. 5 mm before the end, it is a point 215 mm upstream of the original document setting reference position in the scanning direction. As described above, in the image memory 104, the position where the image data of the double-page spread of the original document is stored is determined by the IPU 103, and the surplus portion is arranged in the page displacement direction due to the page turning repetition in the upstream direction of the page turning.

As described above, this apparatus accurately detects the top page position of the double-page spread of the original document by using the page sensor 214 by inserting and ejecting the page-turning page into the page storage unit during the page-turning scanning. The accurate placement of the image is erased, and images around the page and the binding portion are erased. The page edge is detected by turning the page to determine the page size of the original document. In this device, I
After reading the main document for the first time, the PU 103 sets the position of the left edge of the left page on the reading side of the main document detected last time as the position to start storing the main-page spread page image data in the image memory 104. As a result, the image data storage range of the image memory 104 is adjusted to the page edge on the scanning start side, and the image memory 104 is moved to the scanning trailing edge in the direction in which the page is displaced.
Therefore, the margin of the image data storage range is increased.

The IPU 103, as shown in FIG.
In the case of the one-to-one copy mode in which an A3 size original document image is output on a size transfer sheet to make a copy of the original document, the effective image area signal SFGATE and the image memory 1
As can be seen from the data write signal memory W of No. 04, in the first read scan by the scan unit 200, the IPU
By 103, the image data is stored in the image memory 104 from a fixed position. The IPU 103 stores the image data in the image memory 104 in the second and subsequent reading scans by the scanning unit 200 from the page edge position calculated from the page turning position at the time of the previous page turning.

As described above, the image reading plate 10
1 is processed by the VPU 102 and is processed by the IPU 103 in real time in the image memory 1.
04, and is output from the image memory 104 in synchronization with the image formation of the printer. The memory controller in the IPU 103 sequentially sends the image data of the designated address to the address bus of the image memory 104 composed of DRAM. The scanner controller in the IPU 103 manages the memory controller to detect an abnormality. For example, the main document moves during reading of the main document and the set position is missed. When the detected position is on the front side of the right end position of the page on the rear end side of the reading scan, it is determined to be abnormal. At this time, since the image data is not correctly stored in the image memory 104 and the image data is lost, the main control board 107 causes the operation unit 99 to warn before the image output based on the determination.

Next, compensation at the time of zooming will be described. In this apparatus, multi-valued image data after image processing including scaling is stored in the image memory 104, which is write data excluding cutout of page image, erasing of binding portion and frame portion of document. Since the capacity of the image memory 104 is in the range of A3 size or more in the output image, the range in which the image data of the original can be stored is different from that in the normal size copying in the variable size copying. The image data storage range of the image memory 104 is the A3 size at the time of copying at the same size and reduction, whereas at the time of copying at the enlargement (in the sub-scanning direction), the image memory 10 is changed according to the magnification.
The range in which the document image data of No. 4 is stored becomes small. For example, the image memory 10 at the time of enlargement (in the sub-scanning direction) copying
The document image data storage range of No. 4 is B5 size when the scaling ratio is 115%, and is A4 size when the scaling ratio is 141%, which is the maximum.

Since the original document is set on the document table 1 with the front side of the binding portion as a reference, the original document image and the origin of the magnification change are at the left end of the spine cover. In order to realize variable-magnification copying with the limited capacity of the image memory 104, the image data storage range of the image memory 104 is changed as follows during variable-magnification copying. When enlarging and copying, the IPU 103 changes the image data storage start position of the image memory 104 according to the scaling factor, and accordingly the image data storage range of the image memory 104 changes. The image data storage start position P of the image memory 104 when the magnification ratio for magnified copying is M is the image memory 10 for main document copying at a magnification ratio of equal to or less than 1: 1.
For the image data storage start position of No. 4, Pmm = 210 (1-1 / M). The maximum scaling factor is 141% (M = 1.4
The image data storage start position P of the image memory 104 in the case of 1) is a position 61 mm to the right from the image data storage start position of the image memory 104 at the time of equal-magnification copying. Therefore, when the image data storage start position of the image memory 104 when the scaling ratio is equal to or less than 5 mm before the left page end of the maximum size original document, and a point 215 mm upstream of the scanning reference position of the original document Is 141%
The image data storage start position of the image memory 104 at the time of magnified copying is 1 upstream from the reference position for setting the original document.
The point is 54 mm.

FIG. 60 shows the copy operation timing in the main document mode of this apparatus. This is page size A in independent page mode
5 is a copy operation timing when the main document image of No. 5 is enlarged by 141% and is formed on A4 size paper. FIG. 47 shows the copy operation timing in the main document mode when the original document page size and paper size are both A4. In this apparatus, the IPU 103 is used to change the magnification in the sub-scanning direction.
This is done by changing the speed of the scanner motor 106 and the scanning speed of the scanning unit 200 in accordance with the data of the scaling factor from the main control board 107. IPU
The scaling factor data is transferred to 103. The original scanning time during enlargement copying becomes longer in proportion to the enlargement ratio.

As can be seen from the SFGATE and memory W signals in FIGS. 60 and 47, the IPU 103 stores the image data from the VPU 102 in the image memory 104 during the reading scan and outputs the image data from the image memory 104. The original reading operation by the scanning unit 200 is performed within a fixed range regardless of the copy magnification and the original size.
The image memory 104 is detected by detecting the end of the memory address of 4
The storage of the image data in the memory is ended as indicated by the memory W signal. Further, at the time of reduction copying, the IPU 103 detects the trailing end point of the reading scanning before the final address of the image memory 104, and at that time, the storage of the image data in the image memory 104 is completed.

Next, the limitation on the image size / enlargement will be described. In general, a paper size equal to the original document image size after scaling is selected, and if the original document image size is a standard size, the image is properly placed on the paper with the shrinkage due to the bending of the original document binding part as a margin. To be done. If the original document image size after scaling is smaller than the paper size, a blank space is created in the paper to arrange the image.

FIG. 61 shows the image range in the spread page mode, and FIG. 62 shows the image range in the independent page mode. These show the image size at the same size and the document image size at which the image data can be stored in the image memory at the time of 141% enlargement copying. The paper may be selected according to the document image size and the scaling factor as shown in FIGS. 61 and 62.
For example, firstly, in the double-page spread mode, the scaling ratio is equal, the original document page size is A4, and the paper size is B5. Second, in the double-page spread mode, the scaling ratio is 115%, and the original document spread size is B4. When the paper size is B4, the image size is larger than the paper size, and the image runs off the paper. Since the image is arranged on the sheet with the front side of the center of the two-page spread original as a reference, the page edge side and the page upper side are missing.

Further, the case where the document size is larger than the image data storage range of the image memory 104 at the time of enlargement copying will be described. FIG. 63 shows an example of the document size, image size and paper size in the independent page / enlargement copying mode. Show. In this apparatus, the image data storage range of the image memory 104 at the time of 141% enlargement copying is an A4 size area as shown in FIG. 63, and the other range is outside the image data storage range of the image memory 104. Image data cannot be output from the image memory 104.

For example, the scaling factor is 141 in the independent page mode.
%, The page size is A4, and the paper size is A4, the image data storage range of the image memory 104 is an area as shown in FIG. 63, but the area where the image is missing is outside the paper,
The image within the paper range is formed. In this device, IPU1
03 determines whether or not the original image range is the image data storage range of the image memory 104.

Specifically, the IPU 103 calculates in advance the image data storage range of the image memory 104 from the specified scaling ratio from the main control board 107, as will be described later.
Next, the IPU 103 compares the image data storage range of the image memory 104 with the page size of the original document at the time of variable-magnification copying, and when the latter is larger than the former or when the latter partially exceeds the former, Image output is stopped, and a warning is displayed on the guidance display section as shown in FIG.

These controls are performed by the scanner controller in the IPU 103 at the first time of the read page turning scanning. The scanner controller performs the step S as shown in FIG.
Receive the data of the scaling ratio from the main controller at 1,
In step S2, it is determined from the data whether the scaling factor is equal to or less than the same size. If the scaling ratio is equal to or less than the same size, the scanner controller determines in step S3 the image memory 104.
Image data storage range m is calculated from the detection size of the original document (detection value of the end portion in the sub-scanning direction, the binding portion, the end portion in the sub-scanning direction) and the scaling ratio data, and in step S4, a read command is issued from the main controller. Is received, and when a read command is received from the main controller, the scanning unit 200 is caused to read the original document in step S5.

Next, the scanner controller causes the scanning unit 200 to turn the pages of the original document in step S6, and determines in step S7 whether the turned-up pages of the original document are stored in the page storage section in response to an input signal from the page sensor 214. To judge. The scanner controller, in step S8, turns the page sensor 2 when the turning page of the original document is stored in the page storage section.
Based on the input signal from 14, it is determined whether or not the turning page of the original document is discharged from the page storage section. When the turning page of the original document is output from the page storage section, the page sensor 2 is operated in step S9.
The page size p of the main document is calculated by determining the positions of the front end portion and the rear end portion of the main document in the sub-scanning direction as described above according to the input signal from 14.

Next, the scanner controller compares the page size p of the original document with the image data storage range m of the image memory 104 in step S10, and if p <m, then step S1.
In step 4, normal processing is performed. Also, the scanner controller
Unless p <m, an abnormal signal is transmitted to the main controller in step S11. When the main controller receives the abnormal signal from the scanner controller, the main controller proceeds to step S
In step 12, the preparation for image formation is stopped and step S
At 13, the warning is displayed on the guidance display section as shown in FIG. This prevents the image data of the original document from being output without being stored in the image memory 104.

When the main controller stops preparation for image formation and causes the guidance display section to display a warning, and a start signal is input again from the print key without inputting a clear signal from the operation section 99. The image forming and reading operation is restarted by assuming that a part of the page image is output. In the case of FIG. 63, when the original document image is enlarged in the sub-scanning direction in the independent page mode and longitudinal feed paper is selected, the missing area is also within the paper range.

Further, as shown in FIG. 63, in the independent page mode, when the scaling factor is 141%, the page size of the original is A4, the paper size is A3, and the image is arranged on the paper with the center reference,
An image is formed in the center of the sheet by the image data from the image memory 104. In this case, an image inside the paper cannot be formed in the missing area. Image range is image memory 10
When the image data storage range of 4 is exceeded, the IPU 10
Reference numeral 3 designates the maximum image data storage range (the range corresponding to the image width of 210 mm) of the image memory 104 in the sub-scanning direction, and the image is stored in the image memory 104 in the center of the paper, right or left according to the paper standard. A blank space is formed by using all the image data outside the data storage range as white data.

In this embodiment, a scanning unit 200 as a reading means for reading an image of a two-page spread original document from one page end direction of the two-page spread original document, and read image data are stored and are equal to or more than the two-page spread image of the main document. An image memory 104 as a storage means having an image data storage range;
A scanning unit 200 as a page-turning means for turning the pages of the original manuscript from the direction of the other end of the original manuscript;
Since the surplus of the image data storage range of the storage unit 104 is arranged in the end direction on the page turning side, the image data storage range of the storage unit 104 is secured regardless of the displacement of the double-page spread position of this document due to the page turning. You can

[0209] Further, the scanning unit 200 as a reading means for reading the image of the two-page spread original document, and the image memory 104 as a storage means for storing the read image data.
And a scanning unit 200 as a page-turning unit for turning pages of the original document, and the storage capacity of the storage unit 104 is equal to or larger than two pages which is the maximum page size of the original document and the adaptation of the original document. Since the storage capacity is equal to or smaller than the size obtained by adding the maximum page size of 2 pages and the thickness of the maximum original document thickness, even if the double-page spread position of the original document is displaced by the page turning, the displacement amount is the original document thickness. Since the size is smaller, the storage unit 104 having the minimum storage capacity can secure the image data storage range regardless of the displacement of the double-page spread position of the original document due to the page turning.

Further, the scanning unit 200 as a reading means for reading the image of the double-page spread original from one page end direction of the double-page spread original, the image memory 104 as a storage means for storing the read image data, and the main original. Scanning unit 200 as a page-turning means for turning the page out of the other side of the two-page spread original document, a page sensor 214 as a page-end portion detecting means for detecting the page-end position of the two-page spread document, and The storage unit 104 includes the IPU 103 and the IPU 103 as a unit that determines the storage start point of the spread page image data of the storage unit 104 after the detection of the page end position of the spread book document by the detection signal of the page end detection unit. Of the image data stored in the storage means 104 without waste of the storage area of the image data, regardless of the displacement of the facing page position of the original document due to the page turning. It is possible to secure a data storage area.

The above-mentioned original document image forming apparatus is an example of an electrostatic copying apparatus, but the present invention is not limited to the above-mentioned original document image forming apparatus, but is also an original document image reading apparatus in an image forming apparatus such as an electrostatic recording type facsimile. Can be similarly applied to. Further, the main document image forming apparatus described above 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 right-turning main document. With respect to this main document, in the main document image forming apparatus, the devices may be arranged symmetrically, and the left and right pages are reversed. Therefore, in the present document image forming apparatus, those having different left and right pages and edges are included in the present invention.

[0212]

As described above, according to the first aspect of the present invention, a reading means for reading an image of a two-page spread original from one page end direction of the two-page spread original, and read image data are stored in the main document. A storage unit having an image data storage range of more than the spread page image and a page turning unit that spreads the pages of the main document from the other page end direction of the main document,
Since the surplus of the image data storage range of the storage means is arranged in the end direction on the page turning side, the image data storage range of the storage means can be secured regardless of the displacement of the double-page spread position of this document due to the page turning. it can.

According to the second aspect of the present invention, there is provided reading means for reading the image of the two-page spread original document, storage means for storing the read image data, and page turning means for turning the pages of the main document. The storage capacity of the means is equal to or more than the size of two pages of the maximum page size of the original document, and less than or equal to the size of two pages of the maximum page size of the original document and the thickness of the maximum original document thickness. Since the storage capacity is set, the amount of displacement is smaller than the thickness of the original document even if the two-page spread position of the original document is displaced due to the page turning. The image data storage range can be secured by the storage means having a storage capacity.

According to the third aspect of the invention, the reading means for reading the image of the two-page spread original from one page end direction of the two-page spread original, the storing means for storing the read image data, and the page of the main original. A page turning means for turning over from the other page end of the two-page spread original, a page edge detecting means for detecting the position of the page edge of the two-page spread original, and after detecting the position of the page edge of the two-page spread original. Since the start page image data storage start point of the storage means is determined by the detection signal of the page edge detection means, waste of the image data storage range of the storage means is eliminated and the spread page position of the original document is determined. The image data storage range of the storage means can be secured regardless of the displacement due to page turning.

[Brief description of drawings]

FIG. 1 is a block diagram showing a circuit configuration of an example of a document image forming apparatus to which the present invention is applied.

FIG. 2 is a block diagram showing a data processing flow block of the same apparatus.

FIG. 3 is a sectional view showing an image reading unit of the apparatus.

FIG. 4 is a cross-sectional view showing a page turning portion of the apparatus.

FIG. 5 is a schematic diagram showing a main document reading / scanning state of a scanning unit in the apparatus.

FIG. 6 is a schematic view showing a state in which the scanning unit of the apparatus is reversed in the scanning direction.

FIG. 7 is a schematic diagram showing a state of the scanning unit in the same apparatus during page turning scanning.

FIG. 8 is a schematic view showing another main document reading scanning state of the scanning unit in the apparatus.

FIG. 9 is a schematic view showing a page turning scanning state of the scanning unit in the same apparatus.

FIG. 10 is a schematic view showing another page turning scanning state of the scanning unit in the same apparatus.

FIG. 11 is a cross-sectional view showing an outline of the scanning unit.

FIG. 12 is a perspective view showing a document table of the apparatus.

FIG. 13 is a cross-sectional view showing a main document placement portion of the apparatus.

FIG. 14 is a perspective view showing a document platen pressure fixing switching device and a document platen retracting device in the above apparatus.

FIG. 15 is a cross-sectional view showing the document table pressure fixing switching device and the document table retracting device.

FIG. 16 is a perspective view showing a control pulley of the device.

FIG. 17 is a perspective view showing a part of the document table pressure fixing switch and the document table retracting device.

FIG. 18 is a side view showing another part of the platen pressurizing / fixing switching device and the document platen retracting device.

FIG. 19 is a cross-sectional view showing a document table retracted state of the apparatus.

FIG. 20 is a plan view showing the document table retracted state of the apparatus.

FIG. 21 is a timing chart showing a document table retracting operation of the above apparatus.

FIG. 22 is a schematic view showing a state at the time of starting and ending scanning of the scanning unit.

FIG. 23 is a schematic diagram showing a main document scanning start state of the scanning unit.

FIG. 24 is a schematic diagram showing a state where a main document is scanned by the scanning unit.

FIG. 25 is a schematic view showing a state of the scanning unit on the right page of the original document.

FIG. 26 is a schematic view showing a state when the scanning unit is reversely rotated in the scanning direction.

FIG. 27 is a timing chart showing the operation of the scanning unit.

FIG. 28 is a perspective view showing a document table set state of the apparatus.

FIG. 29 is a perspective view showing a state where the document table is pulled out of the apparatus.

FIG. 30 is a diagram showing an example of the relationship between the number of pages of the original document and the amount of displacement of the page position.

FIG. 31 is a diagram showing a detection signal waveform at the right end of the original document.

FIG. 32 is a block diagram showing an end image detection circuit of the main document in the sub-scanning direction of the apparatus.

FIG. 33 is a diagram showing a detection signal waveform at an end portion of the main document in the main scanning direction.

FIG. 34 is a block diagram showing an end image detection circuit of the main document in the main scanning direction of the apparatus.

FIG. 35 is a cross-sectional view showing an image forming unit of the apparatus.

FIG. 36 is a diagram showing a main document set reference of the above apparatus.

FIG. 37 is a cross-sectional view showing a part of a page storage portion of the above apparatus.

FIG. 38 is a plan view showing a part of the operation unit of the apparatus.

FIG. 39 is a plan view showing another part of the operating portion of the apparatus.

FIG. 40 is a plan view showing another part of the operating portion of the apparatus.

FIG. 41 is a diagram showing a page image range of a two-page spread original document of the apparatus.

FIG. 42 is a diagram showing a sheet image in a two-page spread original copy mode of the apparatus.

FIG. 43 is a diagram showing a sheet image in the independent page mode of the apparatus.

FIG. 44 is a timing chart for explaining an image range in the spread mode of the apparatus.

FIG. 45 is a timing chart for explaining an image range in the independent page mode of the above apparatus.

FIG. 46 is a timing chart showing a copy operation timing in the main document mode of the upper apparatus.

FIG. 47 is a timing chart showing a copy operation timing in the main document mode of the upper apparatus.

FIG. 48 is a diagram showing a display example of a guidance display unit of the above apparatus.

FIG. 49 is a flowchart showing a control flow in a copy format selection mode of the above apparatus.

FIG. 50 is a timing chart showing the copy operation timing in the main document mode of the present apparatus.

FIG. 51 is a diagram for explaining main document support of the apparatus.

FIG. 52 is a diagram for explaining a displacement of the original document due to the page turning and the image data storage range of the image memory in the apparatus.

FIG. 53 is a diagram showing a simulation result of the movement of the rightmost top page of the original document.

FIG. 54 is a diagram showing a simulation result of movement of the rightmost uppermost page of another original document.

FIG. 55 is a diagram showing a simulation result of the movement of the rightmost top page of another original document.

FIG. 56 is a diagram showing a simulation result of the movement of the uppermost right page of another original document.

FIG. 57 is a diagram showing a simulation result of movement of the uppermost right page of another original document.

FIG. 58 is a diagram showing a simulation result of movement of the rightmost uppermost page of another original document.

FIG. 59 is a diagram showing a simulation result of movement of the rightmost top page of another original document.

FIG. 60 is a timing chart showing a copy operation timing in the main document mode of the upper apparatus.

FIG. 61 is a diagram showing an image range in a two-page spread mode of the apparatus.

FIG. 62 is a diagram showing an image range in the independent page mode of the apparatus.

FIG. 63 is a diagram showing an example of a document size, an image size, and a paper size in the independent page / enlarged copy mode of the apparatus.

FIG. 64 is a flowchart showing a part of a control flow of the device.

[Explanation of symbols]

 101 image reading plate 102 VPU 103 IPU 104 image memory 200 scanning unit

Claims (3)

[Claims] 1. A reading means for reading an image of a two-page spread original from one page end direction of the two-page spread original, and a storage means for storing the read image data and having an image data storage range equal to or more than the two-page spread image of the main document. And a page-turning means for opening the pages of the original document from the other page end direction of the original document, and arranging the surplus of the image data storage range of the storage means in the edge-direction on the page-turning side. Characteristic original document image reading device. 2. A reading means for reading an image of a two-page spread original document, a storage means for storing the read image data, and a page-turning means for turning a page of the original document, and the storage capacity of the storage means is the original document. The storage capacity is equal to or more than the size of 2 pages of the maximum applicable page size of, and less than or equal to the size of 2 pages of the maximum page size of the original document plus the thickness of the maximum original document thickness. This original document image reading device. 3. A reading means for reading an image of a double-page spread original from one page end direction of the double-page spread original, a storage means for storing read image data, and a page of the double-page spread original. A page turning means that turns over from the edge direction,
A page edge detecting means for detecting the page edge position of the double-page spread original at the time of page turning, and a start point of the double page spread image data storage of the storage means after the detection of the page edge position of the double-page spread original is the page edge detecting means. And a means for making a determination based on the detection signal of the original document image reading apparatus.