JP3400546B2 - Book Scanner - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a document reading apparatus for reading a document and turning pages.

[0002]

2. Description of the Related Art Conventionally, in this document reading apparatus,
The two manuscripts divided into the left and right are constantly pressed upward by the manuscript table pressing springs to place the manuscript on the two manuscripts, and the manuscripts placed on the two manuscripts are scanned. The unit scans and reads during the forward movement, and the scanning unit is returned to the home position. When the pages of the original document are to be turned, the scanning unit is returned to the predetermined page suction position after the reading operation is completed, and the pages of the original document are sucked by the turning belt attached to the scanning unit to return the scanning unit. It is turned over by the movement of the turning belt. Further, in order to perform the optimum reading of the original document, the two original plates are lifted according to the position of the scanning unit by the original plate raising / lowering motor during the reading of the original document to press the original plate upwards to read the original document. Pressurization is applied to stop the platen raising / lowering motor to fix the pressed state.

However, since the two platens are constantly pressed upward by the platen pressurizing springs, the two platens are respectively raised by the platen raising / lowering motor according to the position of the scanning unit when the originals are read. By pressing the original platen to press the original document, and stopping the original platen raising / lowering motor to fix the pressure state, the scanning unit moves on the original platen when the original document is moved to the disengaged position. The original document is located at a position higher than the lowermost portion of the scanning unit, and the scanning unit collides with the original document when returning the scanning unit to the page suction position to turn the page after the reading operation.

Therefore, when the two original plates are respectively raised by the original plate lift motor according to the position of the scanning unit when the original plate is read, the original plates are pressed upward to press the original document, and the original plate lift motor is used. The position of the document table is regulated by using the document table vertical regulating wire or solenoid when stopping the pressure and fixing the pressurizing state.

[0005]

SUMMARY OF THE INVENTION In the above document reading apparatus, the two document plates are lifted in accordance with the position of the scanning unit by the document platen raising and lowering motors to read the document plates to press the document platen. When the original is pressed and the original table up / down motor is stopped to fix the pressed state, the original table vertical regulation wire or solenoid is used to regulate the position of the original table. The structure becomes complicated and the parts cost becomes high.

Further, in order to perform the optimum reading of the original document, the two original plates are respectively raised by the original plate lift motor according to the position of the scanning unit at the time of reading the original document to press the original plates upward. The original document is pressed and the platen lift motor is stopped to fix the pressure. However, if the start / stop timing of the platen lift motor is misaligned, the original document will not be pressed well and the optimum condition will be achieved. There is a possibility that a read image may not be obtained or that the original may be pressed to cause an abnormal operation when the scanning unit comes off the original table.

Further, when a DC motor is used as the platen raising / lowering motor, when the DC motor stops operating, the DC
DC for a while depending on the machine load on the motor
The phenomenon that the motor continues to move is observed.Therefore, if the platen raising / lowering motor is stopped at a position where the pressure on this document should be stopped, the platen raising / lowering motor may be operating for a while, resulting in abnormal operation. is there. If the scanning magnification changes, the movement pitch of the scanning unit differs for each scanning magnification, and the distance that the scanning unit moves after the driving of the platen raising / lowering motor is stopped until the platen raising / lowering motor stops. May change, resulting in abnormal operation.

[0008] The present invention improves the above-described problems, and an object thereof is to provide a book original <br/> manuscript reader can be simplified and cost reduction of the original pressing means.

[0009]

In order to achieve the above-mentioned object, the invention according to claim 1 moves a placing means for placing the original document and the original document placed on the placing means. While
Those who move after reading and reading this original
It moves in the opposite direction, stops temporarily, and is placed on the mounting means.
The edge of the top page of the placed original document was sucked up and lifted
After that, the scanning means for restarting the movement and turning over the top page ,
The elevating means for elevating and lowering the placing means, and the elevating and lowering operation of the elevating means for controlling the reading of the original document and the page of the original document.
When turning, the original document placed on the placing means is scanned.
In the original reading apparatus having a lift control means for the pressurized state with respect to unit, the lift control means, after the reading operation is completed in the present document by the scanning means, the following Motohara
Kopeji before initiating action turning the front by lowering the lifting means
The writing means is lowered .

According to a second aspect of the present invention, in the document reading apparatus according to the first aspect, the elevating control means raises the placing means to a predetermined position at the start of continuous page turning by the scanning means, The scanning control means operates the scanning means after the placing means has moved up to a predetermined position.

[0011]

[0012]

[0013]

According to the first aspect of the invention, the scanning means reads the image data by turning over the pages of the original document placed on the placing means. The mounting means is moved up and down by the elevating means. The elevating control means controls the elevating operation of the elevating means, and lowers the elevating means after the reading operation by the scanning means is completed and before the next turning operation is started.

According to the second aspect of the present invention, the scanning means reads the image data by turning over the pages of the original document placed on the placing means. The scanning operation of the scanning means is controlled by the scanning control means, the elevating operation of the elevating means is controlled by the elevating control means, and the placing means is elevated by the elevating means. The elevating control means raises the placing means to a predetermined position at the start of continuous page turning by the scanning means, and the scanning control means operates the scanning means after the placing means moves to the predetermined position.

According to the third aspect of the invention, the scanning means reads the image data by turning over the pages of the original document placed on the placing means. The mounting means is moved up and down by the elevating means. The lifting control means controls the lifting operation of the lifting means, and stops the driving of the lifting means before the mounting means reaches a predetermined position with respect to the scanning means.

According to a fourth aspect of the present invention, in the document reading apparatus according to the third aspect, the distance means is a scanning means after the driving of the elevating means is stopped before the placing means reaches a predetermined position with respect to the scanning means. The elevating control means variably controls the drive stop timing of the elevating means based on the reading magnification of the scanning means and the moving distance of the distance means.

[0017]

FIG. 1 shows an example of an image forming apparatus to which the inventions of claims 1 and 2 are applied. This image forming apparatus is composed of a scanner unit 11 that forms a scanning unit that turns pages of a main document and reads image data from the main document or a sheet document, and a printer 12 that forms an image on a sheet.
Reference numeral 2 has a scanning unit 13 for turning pages of the original document and reading the original document and the sheet document. The scanning unit 13 is a combination of a main document reading device for reading a main document and turning a page, and a sheet document reading device for reading a sheet document, and sets a document image reading magnification (of a plurality of reading magnifications). CCD (charge coupled device) that reads at the read magnification set on the operation panel
Image reading plate (SBC) 14 having an A / D and processing of an analog image signal from the image reading plate 14
VPU (Video Process) that performs conversion
ng Unit) 15 and a portion 16 including a fluorescent lamp and its inverter power supply, a heater, a thermistor, a fan, a solenoid, and the like. This portion 16 and the VPU 15 are independent flexible cables, each of which has an IPU (Imag)
e Processing unit; image processing device)
It is connected to 17.

The IPU 17 includes a frame unit 18 for storing the image signal from the VPU 15, and the IPU 17 drives a load such as a scanning unit motor composed of a stepping motor for scanning the scanning unit 13 or a document table driving DC motor. It controls through the drive circuit 19 and takes in a signal from the sensor. The printer 12 has a main control unit 21 including a main control unit for controlling copy mode, fetching key signals from the operation panel 20 and display control, and a sequence control unit for controlling copy timing. The sequence control unit and the respective microcomputers of the operation panel 20 mutually transmit and receive commands by serial communication. The main control board 21 controls the inputs of sensors related to the image formation of the printer 12, the motor, the solenoid, the clutch, and the like to perform sequence control of image formation.

FIG. 2 shows a part of this device. The drive circuit (drive board) 23 is applied with a power supply voltage of +24 V from the main power supply 24 and a power supply voltage of +36 V from the standby power supply 25, and is controlled by the IPU 17. The drive circuit 23 takes in a detection signal from a main document detection sensor 26 for detecting whether or not a main document is placed on a document table, which will be described later, and moves up and down the left document table including the scanning unit motor 27 and the DC motor. A right document table raising / lowering motor 29 including a motor 28 and a DC motor is driven. The original table raising / lowering motors 28 and 29 constitute an elevating means for raising and lowering the original table on which the original document is placed.

In the printer 12, the frame memory 1
The image data from 8 is pulse-width modulated by the modulator to become the emission time data, and the laser (LD) controller receives the PW.
It is transmitted as M data in synchronization with the write clock. The LD controller uses the PWM data for LD
The LD 22 is caused to emit light through the driver to expose and scan the photoconductor to form an image. That is, the photoconductor is uniformly charged by the charging device, and then an electrostatic latent image is formed by exposure scanning with the LD 22, and the electrostatic latent image is developed by the developing device and transferred to a sheet made of transfer paper by the transfer device. It IPU17
Also controls the scanning of the scanning unit 13 and controls the scanning unit motor 27 via the drive circuit 23. It also serves as an elevating control means for controlling the elevating operation of the elevating means composed of the document table elevating motors 28 and 29.

In the present apparatus, as shown in FIG. 3, there is a turning belt 30 in the scanning unit 13 for turning pages of the original document BO by electrostatic attraction, and the pages of the original document are placed on the turning belt 30. A charge pattern is formed by the high-voltage power supply, and the charge pattern is electrostatically attracted to the turning belt 30. When the pages of the original document attracted by the turning belt 30 are turned over, the turning belt solenoid oscillates the turning belt 30 upward so that the page end portion of the original document sucked by the turning belt 30 moves to the scanning unit 13 side. It is done by being lifted.

The mirror switching solenoid is a solenoid for switching between the lower reading optical path dedicated to the original document and a general upper reading optical path for sheet originals, etc. A keep solenoid is used and is energized only when the optical path is switched. . Original table 31, 3 as a mounting means for mounting the original document
2 has an A4 size document placing surface (upper surface), and one is disposed on each of the left and right sides of the center of the apparatus main body. A torsion spring (document table pressing spring) constantly exerts a force to push upward. There is. The manuscript table 31 by this torsion spring,
The ascending force of 32 causes the scanning unit 13 to move the document table 31,
The original surface of the upper original 2 comes into contact.

The original table lifting motors 28 and 29 are driven by the drive circuit 2.
When the document table 3 is rotated in the normal direction, the left and right manuscript tables 31, 32 are lowered, and the upper surfaces of the manuscript tables 31, 32 (in this example, the manuscript B
The original surface of O) is retracted to a position below the scanning unit 13. This retracting operation is executed when the power of the apparatus main body is turned on, when the apparatus is in a standby state where scanning is not performed, and when an original on the original table 33 is read.

When the original table raising / lowering motors 28, 29 are rotated in the reverse direction, the left and right original tables 31, 32 are raised, and the original document BO placed on the upper surfaces of the original tables 31, 32 in a spread manner. The surface is pressed against the scanning unit 13. In this way, the left and right manuscript tables 31, 32 are raised to raise the respective manuscript tables 31, 32.
When the original table raising and lowering motors 28 and 29 continue to rotate in the reverse direction with the upper original surface being in pressure contact with the scanning unit 13, the original surface of the original is kept in pressure contact with the scanning unit 13. This pressurizing operation is performed by scanning unit 13 on document table 31, 32.
Is executed only when there is. Document table raising / lowering motors 28, 2 as lifting means for raising / lowering the document tables 31, 32, respectively.
9 is 1 for each of the pair of left and right manuscript tables 31, 32
The IPUs 17 are arranged in groups, and are controlled independently by the IPU 17 which also serves as a control means for controlling the document table lifting motors 28, 29 according to the moving position of the scanning unit 13.

FIG. 4 shows the retracting operation of the document trays 31, 32 downward in the retracting operation mode described above. In this retracting operation mode, the IPU 17 reverses the left and right platen raising / lowering motors 28 and 29 by a predetermined number of revolutions prior to starting the movement of the scanning unit 13, respectively.
Lower 1, 32 downward. After that, the IPU 17 drives the scanning unit motor 27 to move the scanning unit 13. Then, the IPU 17 returns the left and right platen plates 31, 32 to their original positions by rotating the platen plate lifting motors 28, 29 forward a predetermined number of times at the end of the retracting operation mode.

By the way, when the operation of the scanner section 11 is completed, the scanning unit 13 returns to the central home position (center point of the set original document BO) shown in FIG.
Therefore, when the original document BO is placed, the scanning unit 13
Is located at the center home position, and the original document BO is placed on the document tables 31 and 32 with the center of the apparatus as a reference. On the other hand, when reading a document set on the document table 33, as shown in FIG.
The scale 34 arranged on the left side of the reference numeral 3 is placed on the basis of the end face with the right end of the scale 34 as a reference.

When the sheet mode for reading the original on the original table 33 is entered, the scanning unit 13 moves to the left from the central home position and stops at the end home position detected by the end HP sensor (see FIG. 5). (See), and waits until the reading condition is input from the operation panel 20 and the start button is pressed.

As shown in FIG. 11, document pressing rollers 35 and 36 are rotatably supported on the left and right sides below the scanning unit 13, and sheet take-up rollers 39 and 40 are provided on the outer sides thereof.
Are rotatably supported. Each of the sheet take-up rollers 39 and 40 has an independent document holding sheet 3 for the left and right sides.
7 and 38 are wound around the respective central end portions thereof, and the respective outer end portions of the respective document pressing sheets 37 and 38 are fixed to the side plates of the apparatus. The sheet take-up rollers 39 and 40 apply a certain amount of tension to the document pressing sheets 37 and 38 by the action of a spiral spring.

When the scanning unit 13 runs, the document pressing sheets 37 and 38 are pulled out and wound up,
The tensions of the left and right sheet winding rollers 39 and 40 are always maintained substantially constant. Further, as shown in FIG. 3, a platen glass 41 for reading the original document and a turning belt 30 for turning the pages of the original document are provided between the document pressing rollers 35 and 36.
Is provided.

On the other hand, inside the platen glass 41, two fluorescent lamps 42 and 43 for illuminating the original are arranged.
The original document on the document table 31, 32 is illuminated by the fluorescent lamps 42, 43, and the reflected light image thereof is reflected by the first mirror 44 and then alternated by the second mirror 45 and the third mirror 46 as shown in FIG. Is reflected on the image reading plate 14 and is imaged on the CCD on the image reading plate 14. Further, the turning belt 30 is stretched over the turning belt drive roller 48 and the turning roller 49, and the charging roller 50 is arranged in contact with the turning belt 30. When the scanning unit 13 travels, the turning belt drive roller 48 rotates and the turning belt 30 rotates at the same speed as the moving speed of the scanning unit 13.

When reading a document set on the document table 33, the switching mirror 51, which is retracted to a position away from the reading optical path of the scanning unit 13, is moved into the reading optical path of the scanning unit 13 by the action of the keep solenoid. Advance. The movement of the switching mirror 51 switches the optical path between the first mirror 44 and the second mirror 45 from the platen glass 41 side to the document table 33 side. The original on the original table 33 is illuminated by two fluorescent lamps 52 and 53, and the reflected light image is reflected by the second mirror 45 and the third mirror 46.
Image reading plate 1
An image is formed on the CCD on the No. 4.

5 to 9 show the transition of the scanning unit 13, and FIG. 10 shows the timing chart thereof. As shown in FIG. 5, the end home position of the scanning unit 13 is a reading page turning operation start point for the original document BO and an operation end point thereof. Further, in this end home position, the scanning unit 13
Is not resting on the document table 31, 32.

First, the scanning unit motor 23 rotates forward and the scanning unit 13 moves to the right in FIG. Then
When the document pressing roller 35 on the right side of the scanning unit 13 is applied to the left end of the document BO (point A in FIG. 6), the left platen raising / lowering motor 28 is normally rotated and the document platen 31 on the left side is pressed. Become. As a result, the original document BO is pressed against the scanning unit 13 and optimum reading of the original document BO is performed.

As shown in FIG. 7, right before the scanning unit 13 reaches the center point of the original document, the right document pressing roller 35 contacts the left end of the right document table 32 (point B in FIG. 10). . At this time, the right platen raising / lowering motor 29 is normally rotated and the right platen 32 is brought into a pressurized state.
Next, the scanning unit 13 passes the central point of the original document and starts reading the right page of the original document BO. After that, the document pressing roller 36 on the left side of the scanning unit 13 contacts the right end of the document table 31 on the left side (point C in FIG. 10).
At this point, the left document table lift motor 28 is stopped.

FIG. 8 shows an operating state of the scanning unit 13 during reading or turning of the right page of this document. After scanning the right page of the original document, the scanning unit 13 is stopped when the left original pressing roller 36 is on the right end of the right original table 32 (point D in FIG. 9), and then the scanning unit motor 27 is operated. Reversely, the scanning unit 13 moves to the left in FIG. As a result, the scanning unit 13
Moves leftward while flipping the right page of the original document BO, and slightly before the center point of the original document shown in FIG. 7 is reached, the left document pressing roller 36 is caught on the right end of the left document table 31 (C point). At this time, the left platen raising / lowering motor 28 rotates in the forward direction, and the left platen 31 is brought into a pressurized state.

Next, the scanning unit 13 starts the operation of passing the central point of the original document BO and superposing the right page turned up on the left page of the original document BO on the left page. After that, the right document pressing roller 35 engages with the left end of the right document table 32 (point B), and the right document table lifting motor 29 stops. Thereafter, the scanning unit 13 moves to the end home position shown in FIG. 5 and stops.

The turning belt driving roller 48 is composed of a metal roller which is grounded and whose surface is coated with a conductive rubber, and realizes reliable belt driving and grounding. The charging roller 50 is composed of a metal roller, and as shown in FIG.
± 2k at a predetermined timing from the AC power supply 55 via 4
A high voltage of V is applied.

When the scanning unit 13 runs and the turning belt 30 is driven, the changeover switch 54 is turned on at a predetermined timing and a high voltage of ± 2 kV is applied to the charging roller 50 from the AC power supply 55. An alternating electric field is generated on the surface, and by the action of this alternating electric field, a suction force for sucking the uppermost page of the original document BO is generated on the surface of the turning belt 30.

When the manuscript reading operation is started,
The scanning unit 13 in the left end home position starts traveling rightward. And this scanning unit 13
The document reading position on the platen glass 41 of the main document BO
As shown in FIG. 13, when scanning the left page of FIG.
3 starts the reading operation of the main document BO, and reads the document surface of the main document BO from the left page to the right page.

When the scanning unit 200 finishes reading to the end of the right page of the main document BO, the document scanning direction of the scanning unit 13 is reversed as shown in FIG. 14, and the main document BO which has been read as shown in FIG. The page turning operation on the right page of is started. When you start turning the pages of this original document BO,
The turning belt 30 and the page feed roller 56 are located at the position shown by the broken line in FIG. 12, and the charging pattern portion formed on the surface of the turning belt 30 prior to the page turning operation is the top page of the original document BO. On top of. Then, when the leading edge of the uppermost page crosses the center of the lower side of the turning belt 30, the turning belt 30 and the page feed roller 56 are shown by a solid line in FIG. 12 by the action of a solenoid (not shown) as shown in FIG. Moved to a position.

As a result, only the uppermost page of the original document BO is attracted onto the surface of the turning belt 30 by the attraction force of the uneven electric field of the charge pattern formed on the surface of the turning belt 30, and the end portion of the uppermost page is absorbed. It is lifted together with the flipping belt 30. This non-uniform electric field does not attract the pages other than the top page. Here, the timing of charging the turning belt 30 is set so that the turning operation of the turning belt 30 is started together with the return operation of the scanning unit 13 which returns at the same time when the reading of the original surface of the original BO is completed.

After flipping up the top page of the original document BO, the scanning unit 13 moves toward the end home position as shown in FIG.
The top page of the scanning unit 13 is conveyed by being sandwiched between the turning roller 49 and the page feed roller 56 as shown in FIG.
A pair of upper and lower page guides 57, 58 arranged on the right side of the
(See FIG. 11), the front end side is sent out to the right outside of the scanning unit 13 through the space.

Next, as shown in FIG. 17, when the uppermost page of the original document BO is turned up to the binding portion of the original document BO, the turning belt 30 and the page feed roller 56 return to their original positions.
In this state, the scanning unit 13 is further moved toward the end home position, and the original page turned up as shown in FIG. 18 is pulled by the binding portion of the original document to move between the pair of page guides 57 and 58. While returning, it is discharged from the scanning unit 13 so as to be superposed on the left page of the original document BO.

In this manner, when all of the flipped original pages are superposed on the left page of the main original BO, the scanning unit 13 completes one original reading / page turning operation for the spread original. When the document reading / page turning operation is repeatedly performed on the original document BO, or when only one of the document reading or page turning operation is repeatedly performed, the page is turned up as described above. At the same time that all the original pages are superposed on the left page of the main document BO, the moving direction of the scanning unit 13 is reversed and the reciprocating operation of the scanning unit 13 is repeated.

FIG. 19 shows a scan control flow of the IPU 17. The IPU 17 sets the movement position of the scanning unit 13 and causes the drive circuit 23 to start driving the scanning unit motor 27 to start the movement of the scanning unit 13, and the scanning unit motor 27 rotates one step to scan the scanning unit 13. Scan unit 1 every time the
It is checked whether or not 3 has reached the set moving position, and when the scanning unit 13 reaches the set moving position, the driving circuit 23 stops the driving of the scanning unit motor 27 to stop the scanning unit 13.

FIG. 20 shows a flow of raising / lowering control of the IPU 17 at the time of reading an original document, and FIG. 21 shows an operation timing of this apparatus. The IPU 17 controls the scanning unit motor 27, the document table raising / lowering motors 28 and 29, and other loads, and causes the scanning unit motor 27 to rotate in the normal direction as described above, thereby causing the scanning unit 13 to travel rightward from the end home position. Then, the two opened pages of this manuscript are read. In this case, the IPU 17 controls the platen raising / lowering motors 28 and 29 according to the scanning position of the scanning unit 13 via the drive circuit 23 as shown in FIG.
By pressing 1 and 32 to press the main document, optimum reading of the main document is performed.

When the reading of both open pages of the original is completed, the IPU 17 sets the descending time of the right original table 32 and causes the drive circuit 23 to start the driving of the right original table lifting motor 29 so that the right original is moved. The descent of the table 32 is started, the scanning unit motor 27 is rotated in the reverse direction, and the movement of the scanning unit 13 to the page suction position is started. Therefore, the scanning unit 13 can move to the page suction position without hitting the original document. However, this alone may create a space between the original document and the turning belt 30 in the scanning unit 13 when a page of the original document is absorbed. So IPU17
Performs the following control.

That is, the IPU 17 checks whether or not the descending time of the set right original platen 32 has elapsed, and when the descending time of the set right original platen 32 has elapsed, the driving circuit 23 causes the right original platen raising / lowering motor 29 to move. The driving of the right document table 32 is stopped by stopping the driving of the document. Furthermore, IPU
Reference numeral 17 checks a detection signal from a page suction position arrival detection means for detecting that the scanning unit 13 has reached a predetermined page suction position to check whether the scanning unit 13 has reached a predetermined page suction position. To do. Here, VPU15
Also serves as a page suction position arrival detection means and also serves as the image reading plate 1.
From the image data from 4, the black manuscript tables 31 and 32 are discriminated from the white manuscript, and based on the result, the page suction position inside the right end of the double-page spread right page of the manuscript is detected by a predetermined distance.

When the scanning unit 13 reaches the page suction position, the IPU 17 stops the scanning unit motor 27 and stops the scanning unit 13. And IPU17
Checks whether the right document table 32 is descending. If the right document table 32 is descending, the right document table lifting motor 29
Is stopped to stop the lowering of the right original platen 32, and then the rising time of the right original platen 32 is set to set the drive circuit 2
The right document table 32 is raised by driving the right document table raising / lowering motor 29 to 3. Further, the IPU 17 has a right manuscript table 32.
If is not descending, the right manuscript table 32 is raised by setting the rising time of the right manuscript table 32 and driving the drive circuit 23 to drive the right manuscript table lifting motor 29.

Next, the IPU 17 sets the stop time of the scanning unit motor 27 to stop the scanning unit motor 27, checks whether the set rising time of the right document table 32 has passed, and checks the rising time. When the time has elapsed, the driving of the right platen lifting motor 29 is stopped and the right platen 32
Stop rising. Further, the IPU 17 checks whether the set stop time of the scanning unit motor 27 has elapsed, and when the stop time has elapsed, the drive circuit 23.
Turning the belt belt solenoid 3
0 is swung upward, and the turning belt 30 adsorbs the spread right page of the original at the page adsorbing position. Therefore, in the state where there is no space between the original document and the turning belt 30 in the scanning unit 13, the turning belt 30 surely and firmly adsorbs the spread right page of the original document.

Next, the IPU 17 sets the stop time of the scanning unit 13 and checks whether the right document table 32 is rising. If the right original platen 32 is being raised, the IPU 17 stops driving the right original platen lifting motor 29 when the set right original platen 32 has risen, and stops the right original platen 32 from rising. The IPU 17 checks whether or not the set stop time of the scanning unit motor 27 has elapsed, and when the stop time has elapsed, causes the drive circuit 23 to reversely rotate the scan unit motor 27 and move the scan unit 13 to the left. Start and turn the belt 30
Starts turning the double-page spread of this manuscript.

Next, the IPU 17 checks whether or not the right original platen 32 is rising, and if the right original platen 32 is rising, whether or not the set rising time of the right original platen 32 has elapsed. When the ascending time has elapsed, the drive of the right document table lifting motor 29 is stopped and the lowering of the right document table 32 is stopped. Then, the IPU 17 determines whether or not the page turning is completed, and when the page turning is completed, the elevation control is ended.

In this example, since it is not necessary to use a fixing member such as a document table vertical regulating wire for fixing the document tables 31 and 32, the document table pressing mechanism can be simplified.
The cost will be lower. Further, after the reading operation is completed and before the next page turning operation is started, the document table 32 is lowered, so that the scanning unit 13 can be moved to the page suction position without hitting the original document. Further, at the start of the continuous page turning by the scanning unit 13, the scanning unit 13 is operated after raising the right document table 32 to a predetermined position, so that there is a space between the original document and the turning belt 30 in the scanning unit 13. In the state in which the original is not present, the right-side spread page of the original document can be surely adsorbed firmly and the page can be surely turned.

[0054]

[0055]

[0056]

[0057]

[0058]

[0059]

[0060]

[0061]

[0062]

[0063]

As described above, according to the first aspect of the invention, the placing means for placing the original document and the pages of the original document placed on the placing means are turned over to read the image data. In the present document reading apparatus having a scanning unit, a raising / lowering unit for raising / lowering the placing unit, and a raising / lowering control unit for controlling the raising / lowering operation of the raising / lowering unit, the raising / lowering control unit is provided after completion of the reading operation by the scanning unit. Since the elevating means is lowered before the start of the next turning operation, it is not necessary to use a fixing member such as a document table up-and-down regulating wire for fixing the mounting means, and the document table pressing means can be simplified. Therefore, the cost can be reduced. Moreover, the scanning means can be moved to the page suction position without hitting the original document.

According to the second aspect of the invention, the placing means for placing the original document, the scanning means for turning over the pages of the original document placed on the placing means, and reading the image data, and the scanning means. In the present document reading apparatus having a scanning control means for controlling the scanning operation of the means, an elevating means for elevating the placing means, and an elevating control means for controlling the elevating operation of the elevating means, the elevating control means comprises: At the start of continuous page turning by the scanning means, the placement means is raised to a predetermined position, and the scan control means operates the scanning means after the placement means is raised to a predetermined position. The double-page spread right page of the original document can be surely and firmly adsorbed in a state where there is no space between the original document and the scanning means, and the page turning can be surely and firmly performed.

[0065]

[0066]

[Brief description of drawings]

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

FIG. 2 is a block diagram showing a part of the apparatus.

FIG. 3 is a cross-sectional view showing a scanner unit of the apparatus.

FIG. 4 is a schematic view showing a state of the scanner unit during a retracting operation below a document table.

FIG. 5 is a schematic diagram showing a home position transition state of the scanner unit.

FIG. 6 is a schematic diagram showing an image reading start position transition state of the scanner unit.

FIG. 7 is a schematic diagram showing a transition state of a main document center point of the scanner unit.

FIG. 8 is a schematic diagram showing a transition state during image reading or right page turning of the scanner unit.

FIG. 9 is a schematic diagram showing a transition state of an image reading completion position or a page turning start position of the scanner unit.

FIG. 10 is a timing chart showing an operation timing of the scanner unit.

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

FIG. 12 is a cross-sectional view showing a part of the scanner unit.

FIG. 13 is a schematic diagram showing a transition state of a left page reading position of the scanner unit.

FIG. 14 is a schematic diagram showing a transition state of a right page reading completion position of the scanner unit.

FIG. 15 is a schematic diagram showing a transition state of a right page turning start position of the scanner unit.

FIG. 16 is a schematic diagram showing a transition state of the scanner unit in the middle of turning over a right page.

FIG. 17 is a schematic diagram showing a transition state of a right page turning end position of the scanner unit.

FIG. 18 is a schematic diagram showing a transition state of a right page ejection midway position of the scanner unit.

FIG. 19 is a flowchart showing a scan control flow of the IPU in the above apparatus.

FIG. 20 is a flowchart showing an elevation control flow of the IPU.

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

Claims (2)

(57) [Claims] 1. A placing means for placing the original document, and this placing hand.
Scan the originals placed on the columns while moving them
After reading the draft, the direction opposite to the direction of the movement
Booklet placed on the above-mentioned placing means after being moved to
After restarting the movement after picking up and lifting the edge of the top page of
Then, the scanning means for turning the uppermost page, the elevating means for elevating the placing means, and the elevating operation of the elevating means are controlled.
When reading this manuscript and turning pages of this manuscript,
The original document placed on the placing means is added to the scanning means.
In the present document reading apparatus having a lifting control means for setting a pressure state, the lifting control means is configured by the scanning means.
After the reading operation of the original document is finished and before the next page turning operation of the original document is started, the elevating means is lowered to lower the placing means.
This document reading device is characterized by being lowered . 2. The document reading apparatus according to claim 1 , wherein the elevating control means raises the placing means to a predetermined position at the start of continuous page turning by the scanning means, and the scanning control means comprises: The original document reading apparatus, wherein the scanning means is operated after the placing means is moved up to a predetermined position.