JP2004175460A - Document conveying device and method, and image reading device - Google Patents

Document conveying device and method, and image reading device Download PDF

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Publication number
JP2004175460A
JP2004175460A JP2002339943A JP2002339943A JP2004175460A JP 2004175460 A JP2004175460 A JP 2004175460A JP 2002339943 A JP2002339943 A JP 2002339943A JP 2002339943 A JP2002339943 A JP 2002339943A JP 2004175460 A JP2004175460 A JP 2004175460A
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Japan
Prior art keywords
document
reading
paper
original
read
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Granted
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JP2002339943A
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Japanese (ja)
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JP3689081B2 (en
Inventor
Osamu Kamiza
Misao Kobayashi
美佐夫 小林
修 神ざ
Original Assignee
Nisca Corp
ニスカ株式会社
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Priority to JP2002339943A priority Critical patent/JP3689081B2/en
Publication of JP2004175460A publication Critical patent/JP2004175460A/en
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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/00567Handling of original or reproduction media, e.g. cutting, separating, stacking
    • H04N1/0057Conveying sheets before or after scanning
    • H04N1/00572Conveying sheets before or after scanning with refeeding for double-sided scanning, e.g. using one scanning head for both sides of a sheet
    • H04N1/00575Inverting the sheet prior to refeeding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H29/00Delivering or advancing articles from machines; Advancing articles to or into piles
    • B65H29/58Article switches or diverters
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/00567Handling of original or reproduction media, e.g. cutting, separating, stacking
    • H04N1/0057Conveying sheets before or after scanning
    • H04N1/00572Conveying sheets before or after scanning with refeeding for double-sided scanning, e.g. using one scanning head for both sides of a sheet
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/00567Handling of original or reproduction media, e.g. cutting, separating, stacking
    • H04N1/0057Conveying sheets before or after scanning
    • H04N1/00588Conveying sheets before or after scanning to the scanning position
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/00567Handling of original or reproduction media, e.g. cutting, separating, stacking
    • H04N1/0057Conveying sheets before or after scanning
    • H04N1/00591Conveying sheets before or after scanning from the scanning position
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/00567Handling of original or reproduction media, e.g. cutting, separating, stacking
    • H04N1/0057Conveying sheets before or after scanning
    • H04N1/00599Using specific components
    • H04N1/00602Feed rollers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/00567Handling of original or reproduction media, e.g. cutting, separating, stacking
    • H04N1/0057Conveying sheets before or after scanning
    • H04N1/00599Using specific components
    • H04N1/00612Path switches
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/00567Handling of original or reproduction media, e.g. cutting, separating, stacking
    • H04N1/00631Ejecting or stacking
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00Handling processes for sheets or webs
    • B65H2301/30Orientation, displacement, position of the handled material
    • B65H2301/33Modifying, selecting, changing orientation
    • B65H2301/332Turning, overturning
    • B65H2301/3321Turning, overturning kinetic therefor
    • B65H2301/33214Turning, overturning kinetic therefor about an axis perpendicular to the direction of displacement and parallel to the surface of material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00Handling processes for sheets or webs
    • B65H2301/30Orientation, displacement, position of the handled material
    • B65H2301/33Modifying, selecting, changing orientation
    • B65H2301/333Inverting
    • B65H2301/3331Involving forward reverse transporting means
    • B65H2301/33312Involving forward reverse transporting means forward reverse rollers pairs
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2801/00Application field
    • B65H2801/39Scanning

Abstract

A document transport apparatus capable of performing both-side reading operation for aligning the page order as originally set without reversing the page order of the read document in both-side reading of the document, and increasing the speed of the both-side reading operation. And a document conveying method.
A document feed tray, a paper feeder, a transporter for transporting a fed document to a paper exit via a reading position, a switchback path provided in the paper exit, and a switchback path A re-feeding path for guiding the inverted document to the paper feeding position again, and a discharge means provided at the downstream end of the switchback path and discharging the read document to a discharge tray. The document for which double-sided reading has been completed is sent to the sheet feeding position via the switchback path, and is conveyed via the reading position in a state of being overlapped with a document to be fed and read next by the sheet feeding means. Then, the paper is discharged by the paper discharge means via the paper discharge port.
[Selection diagram] Fig. 1

Description

[0001]
[Industrial applications]
The present invention relates to a document transport device and a document transport method mounted on a copy device or a facsimile device for transporting a document to a predetermined reading position in order to read an image of the document. 1. Field of the Invention The present invention relates to a document feeder and a document feed method for discharging a document in a page order without reversing the original face.
[0002]
[Prior art]
[Patent Document 1] JP-A-2001-354336
2. Description of the Related Art In many cases, an image reading apparatus for automatically sequentially reading a plurality of documents includes a transport document reading method (sheet-through reading method) for reading a document while transporting the document over reading means arranged at a predetermined reading position. ) Is used.
[0003]
In this case, the originals stacked on the paper feed tray are fed one by one, read in a state of being rotated (reversed) by 180 degrees, and sequentially discharged onto the paper output tray. ) Is sequentially read, the page order of the document read and discharged as it is on the paper discharge tray is the same as the page order of the document placed on the paper feed tray.
[0004]
However, when reading both sides of a document, one side of the document is read, and then the document is reversed and the other side of the document is continuously read.Therefore, after reading the other side, the document is directly placed on the output tray. When the paper is discharged, the pages of the documents discharged on the paper discharge tray are stacked with the original page surface of the document placed on the paper feed tray reversed.
[0005]
For this reason, for example, in the conventional image reading apparatus disclosed in Patent Document 1, when reading both sides of a document, the page order of the document discharged onto the paper discharge tray is not reversed, and the original page order is not changed. In order to align the documents, one side (front side) of the original is read, and the original is inverted and the other side (back side) is read. The paper is discharged above.
[0006]
[Problems to be solved by the invention]
As described above, when reading both sides of the document, in order to arrange the page order of the document discharged on the paper output tray in the initial state without reversing the page order, after reading the back side of the document, Since an operation of reversing the original is indispensable, the image reading apparatus disclosed in Japanese Patent Application Laid-Open No. H11-133873 reverses the original of which both sides have been read, makes the reading position idle, and discharges the original onto the paper output tray. Since paper is used, the original is conveyed to the reading position three times to read the front and back surfaces, which hinders the speeding up of the double-side reading operation.
[0007]
The present invention has been made in view of the above-described problems, and enables a double-sided reading operation in which the page order of a read document is aligned as before without inverting the page order, and a high-speed double-sided reading operation is performed. It is an object of the present invention to provide a document feeder and a document feed method which are made into a single document.
[0008]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides a paper feed tray on which a document is placed, and a paper feeder for feeding out a document placed on the paper feed tray one by one and feeding it to a predetermined paper feed position. Means for transporting the fed document from the paper feed position to the paper output port via the reading position; and a transport means provided in the paper output direction of the paper output port to switch back and reverse the document. And a re-feeding path for guiding the original switched back and reversed in the switch-back path to the paper feeding position again. The original provided at the downstream end of the switch-back path and having a read image. And a paper discharge means for discharging the paper to the paper discharge tray, and the original whose double-sided reading has been completed is sent to the paper supply position via the switchback path, and the next paper supply is performed by the paper supply means. Overlaid with originals that are printed and read Is conveyed through the reading position in state, there is provided a document feeding device, characterized in that ejected by the paper ejection means via said discharge outlet.
[0009]
Here, by feeding the blank feed document that has been read and the next document to be read in order to align the pages, the transport for reading the next document and the blank feed of the read document have been performed simultaneously. Became possible. This enables a two-sided reading operation in which the page order of the read document is set to the original order without being reversed. Furthermore, in order to read a double-sided document, it is necessary to convey the document to the reading position three times. However, the reading can be completed by two times of conveyance, so that the speed of the double-sided reading operation can be increased.
[0010]
Further, the originals for which the double-sided reading has been completed are conveyed in a state where the leading end thereof is shifted backward by a predetermined distance from the leading end of the next original to be read at the sheet feeding position. With this, the next document to be read is superimposed and transported to the reading position while being shifted forward by a predetermined distance, and the document is always read from the next document to be read. There is no reading of completed documents.
[0011]
Further, the paper discharge means includes a paper discharge roller pair rotatable at different rotational speeds in order to discharge the double-sided read original to the paper discharge tray.
[0012]
The discharge roller pair includes a first discharge roller that contacts a document that has been subjected to the double-sided reading of the stacked documents and a second discharge roller that contacts the next document to be read. When the document on which double-sided reading has been completed is discharged onto the discharge tray, the first discharge roller is rotated at a higher speed than the second roller.
[0013]
Thus, at the position of the pair of paper discharge rollers, it is possible to convey the overlapped originals for which double-sided reading has been completed to the paper output tray before the next original to be read.
[0014]
Further, after detecting that the document having undergone the double-sided reading has passed through the pair of discharge rollers, the discharge roller pair switches back the next document to be read by reversely rotating the rotation direction. The paper is sent to the paper feeding position.
[0015]
The paper discharge roller pair includes a reverse-prevention lever that stops the rear end of the document that has been read so as not to switch back when the rotation direction of the paper discharge roller pair is reversed. As a result, the next document to be read is switched back to read its back surface, and the previously conveyed document that has been conveyed earlier at the position of the discharge roller is discharged to the discharge tray with the page order aligned. It is now possible to paper.
[0016]
Further, the present invention provides a step of feeding a document placed on a paper feed tray to a predetermined feeding position, a step of transporting the fed document, and a step of transporting the document transported to a predetermined reading position. Reading one side, switching back and reversing the original whose one side has been read, feeding the switched back inverted document to the paper feeding position again, Conveying the original whose one side has been read and reading the other side of the original, switching back the original that has been subjected to double-sided reading and inverting the original again, Re-sending the document to the sheet feeding position, transporting the document for which double-side reading has been completed via the reading position in a state of being superimposed on the next fed document, and Ejecting the completed original, and discharging the double-sided read original, wherein the original is conveyed in a state of being overlapped with the next fed original. It is an object of the present invention to provide a document reading method in which one side of a fed document is read.
[0017]
Here, by feeding the blank feed document that has been read and the next document to be read in order to align the pages, the transport for reading the next document and the blank feed of the read document have been performed simultaneously. Became possible. As a result, it is possible to perform a two-sided reading operation in which the page order of the read original is not changed to an inverted state and to arrange the page order as originally, and to speed up the two-sided reading operation.
[0018]
Further, in the step of transporting the original having undergone the double-sided reading via the reading position in a state of being superimposed on the next fed original, the original having undergone the double-sided reading is provided at the leading end thereof at the paper feeding position. Is conveyed in a state where the original is fed backward by a predetermined distance from the leading end of the next fed document.
[0019]
With this, the next document to be read is superimposed and transported to the reading position while being shifted forward by a predetermined distance, and the document is always read from the next document to be read. There is no reading of completed documents.
[0020]
Further, after the step of ejecting the original on which both-side reading has been completed, the step of switching back the original whose one side of the next-fed original has been read and sending the original to the sheet feeding position; And reading the other side of the document whose one side has been read.
[0021]
Here, the present invention relates to a conveying unit that feeds out a document one by one and conveys the document to a predetermined reading position, a reading unit that reads a document image that moves the reading position, and a front and back of the document read at the reading position. A switchback path for reversing the sheet, turning over the sheet, and re-feeding the sheet to the reading position; and a sheet discharging means for discharging the read document. The document is transported twice from the reading position to the switchback path. The front and back sides of the original are read by a reading unit, and then the read original and the next fed original are superimposed and conveyed to the reading position, and the next fed original which is superimposed and conveyed And an image reading apparatus provided with control means for reading the image by the reading means.
[0022]
The control means conveys the document twice from the reading position to the switchback path, performs reading of the front and back of the document by the reading means, and thereafter reads the document which has been read and the next fed document. Control for reading the next fed sheet of document fed by the reading means by the reading means, and transferring the document twice from the reading position to the switchback path by the reading means. It is possible to select the control of reading the front and back sides of the original, further controlling the original that has been read out, inverting the original, and then discharging the original by the paper discharge unit and then reading the next fed original.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the details of a document feeder and a document feed method according to the present invention will be described with reference to the drawings.
[0024]
FIG. 1 is a longitudinal sectional view of an automatic document feeder showing an embodiment of a document feeder according to the present invention, showing a state where the document is mounted on an image reading apparatus. FIG. FIG.
[0025]
In FIG. 1, reference numeral 10 denotes an automatic document feeder (hereinafter, referred to as “ADF 10”) mounted on the image reading apparatus main body 1, and the ADF 10 is an upper surface of the first platen 2 of the image reading apparatus main body 1 (FIG. 1). The document is conveyed so as to pass through. The apparatus main body 1 irradiates the conveyed document with light from a light source 3 such as a lamp via a first platen 2, reflects the reflected light on a mirror 4, and photoelectrically converts the document by reading means such as a CCD. Read the image. That is, the upper surface of the first platen 2 constitutes the reading unit of the apparatus main body 1. The apparatus main body 1 also includes a second platen 5 having an area on which a document can be placed. The document placed on the upper surface of the second platen 5 by opening and closing the ADF 10 includes the light source 3 and the mirror 4. By moving the light source unit in the sub-scanning direction, an image on a document can be read via the second platen 5.
[0026]
The ADF 10 includes a paper feed tray 15 on which a plurality of documents can be placed, and a paper feed unit (paper feed unit) that separates the documents on the paper feed tray 15 one by one and feeds them toward the first platen 2. ) 11, a transport unit (transporting means) 12 for passing the original along the upper surface of the first platen 2, and a paper discharging unit (paper discharging means) 13 for receiving and discharging the original passing through the upper surface of the first platen 2. And a paper discharge tray 16 for storing a document from which an image discharged from the paper discharge unit 13 has been read. Further, the ADF 10 switches the document discharged from the upper surface of the first platen 2 by the paper discharging unit 13, sends the document again to the paper feeding unit 11, and feeds the document to the upper surface of the first platen 2, And a re-feed path 30. Here, the paper feed tray 15 is inclined at a certain angle and is arranged above the paper discharge tray 16 with a space secured.
[0027]
The document placed on the paper feed tray 15 has its side portion regulated by the side guide 17, and the tip thereof is regulated by the stopper 60. The paper feed tray 15 is rotatably mounted around a leading end 15a of the placed document as a fulcrum.
[0028]
The paper feed unit 11 descends and comes into contact with the uppermost surface of the document on the paper feed tray 15, and a feed roller 18 that can move up and down to feed the document, and a feed roller 19 that feeds the document fed by the feed roller 18. A separating pad 20 that passes only one of the upper documents and blocks the feeding of the second and subsequent documents, and abuts the leading end of the document separated by the separating device into one. It is composed of a pair of registration rollers 21 that are fed downstream after alignment, and feeds a document along a paper feed path 25.
[0029]
The transport section 12 includes a pair of transport rollers 22 for supplying a document to the first platen 2 on the upstream side of the first platen 2 and a pair of transport rollers 23 for discharging the document from the first platen 2 on the downstream side. The document is transported along a transport path 26 formed by the first platen 2 and the scooping guide 6 on the main body 1 side and the backup guide 26a on the ADF 10 side.
[0030]
The paper discharge unit 13 and the switchback unit 14 share a part on the paper discharge tray 16 side, and are provided with a paper discharge roller pair 24 for discharging a document to the paper discharge tray 16. The paper discharge roller pair 24 is controlled so as to rotate in the reverse direction with the rear end side of the document being nipped in the double-sided reading mode, switch back the document, and send the document to the paper supply unit 11 as described later. .
[0031]
Further, the paper discharge roller pair 24 is provided with a paper discharge roller so that when the front and rear ends of the document circulated from the switchback unit 14 through the paper discharge unit 13, the re-feed path 30, and the transport unit 12 pass each other, there is no problem. The paper discharge roller 24b (second paper discharge roller) is configured to be separated from the paper discharge roller 24a (first paper discharge roller).
[0032]
In addition, a switchback path 28 and a flapper 29 for guiding a document to the paper discharge unit 13 are provided in a shared portion of the paper discharge unit 13 and the switchback unit 14. The flapper 29 is constantly urged downward by an urging spring (not shown), and the discharge roller pair 24 passes through a discharge port 31 where the original merges with the switchback path 28 along the discharge path 27. When the document is sent to the printer, the document is pushed upward by the leading edge of the discharged document to allow the document to pass. When the document is switched back by the discharge roller pair 24, the document is positioned below and closes the discharge path 27, and the document is guided to the switchback path 28.
[0033]
The paper discharge path 27 is formed by a paper discharge upper guide 27a provided with a backup guide 26a provided to face the first platen 2 and a paper discharge lower guide 27b formed of resin integrally with the paper discharge tray 16. ing. The switchback path 28 re-feeds the original with a switchback upper guide 28 a (FIG. 2) provided continuously with the original guide surface of the flapper 29 and a discharge lower guide 27 b extending from the discharge path 27. It is formed to guide to the road 30. The refeeding path 30 is provided continuously from the switchback path 28, and the original is moved to the sheet feeding position (hereinafter, referred to as “nip point”) of the registration roller pair 21 by the upper switchback guide 28a and the lower switchback guide 28b. It is formed to guide.
[0034]
That is, the re-feeding path 30 and the feeding path 25 are configured to join at the nip point of the registration roller pair 21, and at this junction position, the mylar 28 c guides the document to the nip point of the registration roller pair 21. Is extended.
[0035]
Next, the drive configuration of each roller will be described with reference to FIGS. Note that the ADF 10 is configured to drive each roller by a feed motor M1 and a transport motor M2 that can be rotated forward and backward, and FIG. 3 shows a drive transmission system of the feed motor M1, and FIG. Indicates a drive transmission system of the transport motor M2.
[0036]
First, as shown in FIG. 3, the drive transmission system of the paper feed motor M1 transmits the forward rotation drive of the paper feed motor M1 from the pulley P16 to the pulley P36 via the timing belt T16, and drives the pulley P36 with the gear Z17. The gear Z19 and the gear Z18 attached to the drive shaft of the paper feed roller 19 are transmitted in this order, and the paper feed roller 19 rotates in the direction of feeding the original.
[0037]
A pulley P18 is provided on the drive shaft of the paper feed roller 19, and the drive is also transmitted to the feed roller 18 via a timing belt T2 stretched between the pulley P11 and the pulley P11 provided on the shaft of the feed roller 18. Is done.
[0038]
One end of an elevating arm 18a that supports the feeding roller 18 is attached to the drive shaft of the paper feed roller 19, and is moved up and down by rotation of the drive shaft in the paper feed direction (forward rotation of the paper feed motor M1). When the feeding roller 18 descends due to the rotation of the arm 18a and the feeding roller comes into contact with the document, the drive shaft of the sheet feeding roller 19 is idled with respect to the elevating arm 18a by the action of the spring clutch A and the spring clutch B. Make up.
[0039]
At this time, the registration roller 21a is connected to a pulley P28 provided on its drive shaft by a timing belt T3 stretched over a pulley P22 provided coaxially with the pulley P36, but is provided in the pulley P28. It does not rotate due to the action of the one-way clutch OW1.
[0040]
The reverse rotation drive of the feed motor M1 is transmitted from the pulley P16 to the pulley P36 via the timing belt T16, and is attached to the shaft of the registration roller 21a via the timing belt T3 from the pulley 22 provided coaxially with the pulley P36. The transmission to the pulley P28 causes the registration roller 21a to rotate in the paper feeding direction.
[0041]
At this time, the reverse rotation of the paper feed motor M1 is also transmitted to the drive shaft of the paper feed roller 19, and the feed roller 18 is raised by rotating the elevating arm 18a counterclockwise. It does not rotate due to the action of the one-way clutch OW2 provided inside. The raised lifting arm comes into contact with a regulating member (not shown), and the drive shaft of the sheet feeding roller 19 is configured to idle with respect to the lifting arm 18a by the action of the spring clutch C.
[0042]
Next, as shown in FIG. 4, the drive transmission system of the transport motor M2 transmits the drive from the pulley P26 provided on the drive shaft to the pulley P46 via the timing belt T4, and is provided coaxially with the pulley P46. Drive is transmitted from the pulley P33 to the pulley P32 attached to the shaft of the transport roller 23a via the timing belt T6, and the transport roller 23a is rotated forward or backward.
[0043]
The drive transmitted to the pulley P32 is transmitted to the gear Z2 by a gear Z1 provided coaxially, and rotates the transport roller 23b via a spring clutch C. The peripheral speed of the transport roller 23a and the set peripheral speed of the transport roller 23b are the same. .
[0044]
Further, the drive transmitted to the pulley P32 is configured such that the drive is transmitted to the pulley P31 attached to the shaft of the transport roller 22a via the timing belt T7, and the transport roller 22a is rotated forward or backward. I have. The drive transmitted to the pulley P31 is transmitted to the gear Z4 by the gear Z3 provided coaxially, and rotates the transport roller 22b via the spring clutch D.
[0045]
The peripheral speed of the transport roller 22a and the set peripheral speed of the transport roller 22b are the same, but if a peripheral speed difference occurs between the transport roller 22a and the transport roller 22b, the peripheral speed difference is absorbed by the action of the spring clutch D. .
[0046]
The drive of the transport motor M2 transmitted to the pulley P46 via the timing belt T4 is performed by transmitting the drive from the pulley P42 provided coaxially to the pulley P46 to the pulley P48 via the timing belt T5, and The paper discharge roller 24a (first paper discharge roller) attached to the axis of the shaft through a spring clutch E is rotated forward or backward.
[0047]
Further, the drive transmitted to the pulley P48 is transmitted to Z6 by a gear Z5 provided coaxially to rotate the paper discharge roller 24b (second paper discharge roller). The peripheral speed of the transport roller 23a and the set peripheral speed of the paper discharge roller 24b are the same. The set peripheral speed of the paper discharge roller 24a is faster than that of the paper discharge roller 24b. When one sheet of paper is nipped between the paper discharge roller 24a and the paper discharge roller 24b or when there is no paper, the spring clutch E acts. The discharge roller 24a follows the peripheral speed of the discharge roller 24b.
[0048]
Further, a press-contact solenoid SOL is provided as a drive source for separating the sheet discharge roller pair 24. The press-contact solenoid SOL excites (turns on) the press-contact solenoid SOL to move the discharge roller 24b to a position where the discharge roller 24b presses against the discharge roller 24a. When the excitation is released (OFF), the discharge roller 24b is moved to a position separated from the discharge roller 24a by the action of an urging spring that urges the discharge roller 24b away from the discharge roller 24a. Is configured.
[0049]
The paper discharge roller 24a is coaxially provided with a reverse return prevention lever 35 via a spring clutch F.
[0050]
During rotation in the discharge direction (counterclockwise) for the discharge roller 24a, the reverse prevention lever 35 is stopped at an upper position retracted from the discharge port. In the rotation in the switchback direction (clockwise direction), the reversing prevention lever 35 descends to the paper discharge port, hits the upper surface of the switchback paper, slips and stops by the spring clutch F, and prevents the discharged document from returning.
[0051]
The paper feed tray 15 is provided with a plurality of sensors S1, S2, S3 (FIG. 1) in the document feeding direction, and the plurality of sensors S1, S2, S3 are placed on the paper feed tray 15 by the ON-OFF state. The length of the document placed on is detected. Further, the width direction of the document placed on the paper feed tray 15 is detected from a volume (not shown) whose output changes according to the movement amount of the side guide 17, and the document width detection result and a plurality of sensors S1, The document size is determined based on the document length detected in S2 and S3.
[0052]
1 and 7, an empty sensor S4 for detecting that a document is placed on the paper feed tray 15 and a paper feed path 25 are fed along the route for guiding the document. A registration sensor S5 for detecting the end of the document, a lead sensor S6 provided in front of the first platen 2 for detecting the end of the document, and a discharge sensor for detecting the end of the document discharged from the first platen 2. S7 is provided.
[0053]
Here, as shown in FIG. 5, a lever-type sensor is employed as the lead sensor S6, and the lead sensor S6 is disposed in a curved portion of the paper feed path 25. At the document detection position of the paper feed lower guide 25b of the read sensor S6, a protrusion 25c formed of a plurality of ribs is provided.
[0054]
A sensor lever S6a of the read sensor S6 extends on the paper feed path 25 provided with the protruding portion 25c. The protruding portion 25c corrects the leading edge of the document and guides the document at a narrow distance from the upper paper feed guide 25a, so that the timing of detecting the leading edge of the document does not vary.
[0055]
Each of these sensors S1 to S7 is connected to a CPU that controls the driving of the entire apparatus. Based on a detection signal from each sensor, each of the above-described motors M1 and M2 is driven and the pressure welding solenoid SOL is excited. Is made.
[0056]
Next, the document transport control operation of the ADF 10 having the above-described configuration will be specifically described in the first embodiment. It should be noted that FIGS. 6 to 12 which schematically show the conveyance state of the document as necessary are referred to. Further, the reference numerals in the triangles attached to the originals D1 and D2 shown in the drawing indicate the pages of the original.
[0057]
First, a single-sided reading mode for reading one side of a document will be described. When the empty sensor S4 is turned on, that is, when it is detected that a document is placed on the paper feed tray 15, the paper feed motor M1 is driven to rotate forward. The first document D1 is fed. At this time, the feed roller 18 and the paper feed roller 19 are rotated in the document feed direction, but the registration roller pair 21 does not rotate due to the action of the one-way clutch OW1.
[0058]
When the registration sensor S5 detects the leading edge of the fed document, the paper feed motor M1 is temporarily stopped after a predetermined time from the detection. When the feed motor M1 is stopped, the leading end of the document is abutted against the nip portion of the pair of registration rollers 21 to form a bend, the leading end of the document is aligned, and the skew is removed (see FIG. 6A).
[0059]
After the stop, the sheet feeding motor M1 is driven to rotate in the reverse direction, the transport motor M2 is driven, and the press-contact solenoid SOL is excited. At this time, the feeding roller 18 rises to a position separated from the document, the feed roller 19 is cut off by the action of the one-way clutch OW1, and the registration roller 21a of the registration roller pair 21 is rotated in the document feeding direction.
[0060]
The original D1 is transported from the paper feed path 25 to the transport path 26 by the rotation of the motors M1 and M2, and after a predetermined time elapses after the lead sensor S6 detects the passage of the leading end of the original D1, the paper feed motor M1 Then, the transport motor M2 is temporarily stopped (see FIG. 6B).
[0061]
Then, upon receiving the reading and conveying signal from the image reading apparatus main body 1, the conveying motor M2 is driven again. The front side (one side) of the document D1 is sub-scanned and read by the reading unit. At this time, the document D <b> 1 is conveyed onto the paper discharge tray 16 by pushing up the front end of the flapper 29 arranged so as to close the paper discharge path 27 at the front end.
[0062]
When the registration sensor S5 detects the passage of the trailing end of the document D1 after the document D1 is sent out, it checks whether or not the next document is present in the paper feed tray 15; The feeding operation of the second original D2 starts similarly to the first original D1.
[0063]
When the second original D2 is fed, the feed roller 18 and the feed roller 19 are rotated by the forward rotation of the feed motor M1 as in the case of the previous original, and the original D2 is moved to the nip point of the registration roller pair 21. The skew is removed by abutment (see FIG. 6C). Further, the feed motor M1 is driven to rotate in the reverse direction, the drive of the feed motor M1 is stopped a predetermined time after the lead sensor S6 detects the leading end of the next document, and the transport motor M2 is also stopped.
[0064]
Here, the leading end of the document D2 is stopped before the first platen 2, and the trailing end of the first document D1 is nipped by the discharge roller pair 24. It stops (see FIG. 7D).
[0065]
Then, upon receiving the reading and conveying signal from the image reading apparatus main body 1, the conveying motor M2 is driven again. The surface of the document D2 is sub-scanned and read by the above-described reading means. During reading of the second document D2, the first document D1 is discharged onto the discharge tray 16 (see FIG. 7E).
[0066]
When the registration sensor S5 detects the passage of the trailing edge of the document D2, it is checked whether the empty sensor S4 detects the presence of the next document. The feeding operation of the original D3 is started. Thereafter, as long as the empty sensor S4 detects the presence of a document, the same processing is performed on the documents D4, D5,.
[0067]
The drive of the conveying motor M2 is stopped after the time required for the last document to be discharged to the discharge tray 16 after the discharge sensor S7 detects the trailing end of the last document, and the excitation of the pressure solenoid SOL is stopped. The processing is canceled, and the processing of all the originals ends.
[0068]
Next, the duplex reading mode will be described. The original reading selects whether to perform high-speed reading or high-precision reading. This selection is performed by a selection switch (not shown). Hereinafter, reading performed at high speed reading will be described.
[0069]
First, reading of the first double-sided document will be described. When the empty sensor S4 detects that a document has been placed on the paper feed tray 15, the first document D1 is fed by the forward rotation of the paper feed motor M1 and fed by the feed roller 18 in the same manner as in the single-sided reading mode. The roller 19 is rotated, and the original is pressed against the nip point of the registration roller pair 21 to remove the skew.
[0070]
After the leading edge of the document D1 conveyed by the reverse rotation drive of the paper feed motor M1 and the forward rotation drive of the conveyance motor M2 is detected by the read sensor S6, the paper supply motor M1 and the conveyance motor M2 are temporarily stopped. The document D1 is in a state where the leading end position is stopped before the first platen 2. At this time, the pressure contact solenoid SOL is excited, and the sheet discharge roller pair 24 is pressed (see FIG. 8A).
[0071]
When a reading and conveying signal is received from the image reading apparatus main body 1, the conveying motor M2 is driven to rotate forward, so that the surface of the original is sent onto the first platen 2 and is sub-scanned by the reading means and read. The document D1 read by the first platen 2 is guided to the paper discharge path 27.
[0072]
The document D1 guided from the paper discharge path 27 to the paper discharge port 31 is conveyed onto the paper discharge tray 16 by pushing up the front end of the flapper 29 arranged so as to close the paper discharge port 31 with its front end. In this transport state, when the time required for the trailing edge of the document D1 to pass through the position of the flapper 29 after the paper ejection sensor S7 detects the trailing edge of the document D1, the drive of the transport motor M2 is stopped, and The rear end of D1 is nipped by the paper discharge roller pair 24 and stopped (see FIG. 8B).
[0073]
Thereafter, the transport motor M2 is driven to rotate in the reverse direction. As a result, the paper discharge roller 24a rotates in the reverse direction, the document D1 is switched back, and the document D1 is re-switched from the switchback path 28 along the document guide surface of the flapper 29 that has moved to a position to close the paper discharge port 31 as the document passes. It is guided to the paper feed path 30. After the leading edge of the document D1 guided to the re-feeding path 30 is detected by the registration sensor S5, the conveyance motor M2 driven in the reverse direction forms a bend at the nip portion of the registration roller pair 21 to remove skew. Then, the operation is stopped after a predetermined time has elapsed (see FIG. 8C).
[0074]
Then, the sheet feeding motor M1 is driven to rotate in the reverse direction to re-feed the document D1. The reverse rotation of the paper feed motor M1 rotates the registration roller 21a in the paper feeding direction, and after a lapse of time during which the leading end of the document D1 reliably nips the registration roller pair 21, the excitation of the pressure contact solenoid SOL is released, and the paper discharge driven roller 24b is moved downward to separate it from the paper discharge roller 24a, and the transport motor M2 is driven to rotate forward.
[0075]
The document D1 is inverted and fed along the paper feed path 25, and when the leading end is detected by the read sensor S6, the transport motor M2 stops after a predetermined time and stops the paper feed motor M1. Thereafter, the transport motor M2 is driven again by the read transport signal from the image reading apparatus main body 1, and the back surface of the document D1 is sub-scanned and read by the reading means. At this time, the leading edge of the document D1 sent to the paper ejection tray 16 and the trailing edge of the document D1 re-fed are passed by a common part of the paper ejection path 27 including the paper ejection roller pair 24 and the switchback path 28. However, the sheet can be conveyed without any trouble because the sheet discharge roller pair 24 is separated (see FIG. 9D).
[0076]
Thereafter, when the registration sensor S5 detects the trailing end of the document D1, the pressure contact solenoid SOL is excited to press the paper discharge roller pair 24, and a predetermined time has elapsed since the paper discharge sensor S7 detected the rear end of the document D1. After the lapse of time, the drive of the transport motor M2 is stopped, and the document D1 is stopped with its trailing end nipped by the pair of paper discharge rollers 24 (see FIG. 9E).
[0077]
Next, when the registration sensor S5 detects the passage of the rear end of the document D1, it is checked whether or not the empty sensor S4 detects the presence of the next document. Start the paper feeding operation.
[0078]
In the same manner as in the first document, the feeding roller 18 and the paper feeding roller 19 are rotated by the forward rotation of the paper feeding motor M1, and the skew is removed from the second document D2 by abutting the document against the nip point of the registration roller pair 21. The original D2 conveyed by the reverse rotation drive of the paper feed motor M1 and the forward rotation drive of the conveyance motor M2 has the leading end thereof at a predetermined distance from the registration roller pair 21 (the distance "Z" shown in FIG. 10B). It is transported and temporarily stopped (see FIG. 11A).
[0079]
Then, the document D1 is inverted by 180 degrees, and the empty feed is performed so that the pages are aligned and discharged to the discharge tray 16. For this reason, the transport motor M2 is driven to rotate in the reverse direction, and the skew is removed by abutting the leading end of the document D1 on the nip portion (feeding position) of the registration roller pair 21 in the refeeding path 30 (see FIG. 10B). The tip deviation amount between D2 and the document D1 is the distance “Z” shown in the figure).
[0080]
The document D2 is simultaneously fed two sheets in a state of being overlapped with the document D1 by the reverse rotation driving of the sheet feeding motor M1 and the normal rotation driving of the conveyance motor M2, and the driving of the sheet feeding motor M1 is stopped by the lead sensor S6 detecting the leading end of the document D2. I do. After the leading edge of the document D2 is detected by the read sensor S6, the feed motor M1 and the transport motor M2 are temporarily stopped, and the leading edge of the document D2 is stopped short of the first platen 2. At this time, the pressure contact solenoid SOL is excited, and the sheet discharge roller pair 24 is pressed (see FIG. 10C).
[0081]
Then, upon receiving a reading / conveying signal from the image reading apparatus main body 1, the front surface of the document D <b> 2 is sent onto the first platen 2 by the forward rotation of the conveying motor M <b> 2, and is sub-scanned and read by the reading unit. .
[0082]
At this time, the image data for determination of the front surface of the document D1 (for example, the inverted image data of the front surface image of the document D1) previously read and stored in the read data storage unit is shifted while being shifted by the same amount as the deviation amount Z. Of the original D2. If it is determined that the front side image of the fed blank feed document D1 is see-through, a warning is given to the operator, and cancellation or forced execution is performed. The conveyance in a state in which two originals are stacked is stopped, and the idle feed only for reversal, which is performed in the conventional art, is performed to prevent the originals from being transparent, and other processing is performed.
[0083]
The document D <b> 1 conveyed in a state of being superposed on the document D <b> 2 read by the first platen 2 is guided to the paper discharge path 27.
[0084]
The document D1 being conveyed in a state of being overlapped with the document D2 guided from the paper discharge path 27 to the paper discharge port 31 has the front end of the flapper 29 arranged so as to close the paper discharge port 31 with the front end of the document D2. The sheet is pushed up and transported onto the sheet discharge tray 16. In this transport state, when it is detected that the rear end of the document D1 has passed the transport roller pair 23, the document D1 is discharged at the peripheral speed of the discharge roller 24a (first discharge roller) and the document D2 is discharged. The sheet is conveyed at the peripheral speed of the roller 24b (second discharge roller) (see FIG. 11D).
[0085]
Here, the setting of the transport speed for transporting the documents D1 and D2 can be expressed as follows.
[0086]
The peripheral speed of the discharge roller 24a is V1 and the peripheral speed of the discharge roller 24b is V2. The displacement amount between the document D1 and the document D2 is Z, the distance from the conveying roller pair 23 to the passage through the flapper 29 (possible switchback position) is L, and the distance between the passage position of the flapper 29 and the reverse prevention lever 35 is H. I do.
V1 ≧ V2 (L + H) / (L−Z)
With the above setting, when the rear end of the document D2 reaches the switchback position, the rear end of the document D1 reaches the reverse prevention lever 35.
[0087]
When the time required for the trailing edge of the document D1 to pass through the position of the reversing prevention lever 35 provided downstream of the flapper 29 after the paper ejection sensor S7 detects the trailing edge of the document D1, the drive of the transport motor M2 is stopped. The document D2 is stopped, and the trailing end of the document D2 is nipped by the paper discharge roller pair 24 and stopped (see FIGS. 11E and 11F).
[0088]
Thereafter, the transport motor M2 is driven to rotate in the reverse direction. As a result, the paper discharge rollers 24a and 24b rotate in the reverse direction, the document D1 is stopped by the reverse prevention lever 35, only the document D2 is switched back, and the flapper is moved to a position to close the paper discharge port 31 as the document D2 passes. The document is guided to the switchback path 28 along the original guide surface 29 (see FIG. 12G).
[0089]
When the leading edge of the document D2 guided from the switchback path 28 to the refeed path 30 is detected by the registration sensor S5, the conveyance motor M2 driven in the reverse rotation forms a bend at the nip portion of the registration roller pair 21. , The skew is removed, and the operation is stopped after a predetermined time has elapsed.
[0090]
Then, the sheet feeding motor M1 is driven to rotate in the reverse direction to re-feed the document D2. The reverse rotation of the paper feed motor M1 causes the registration roller 21a to rotate in the paper feeding direction, and after a lapse of time during which the leading end of the document D1 reliably nips the registration roller pair 21, the excitation of the pressure contact solenoid SOL is released, and the paper discharge roller 24b Is moved downward to separate it from the paper discharge roller 24a, and the transport motor M2 is rotated forward. When the trailing edge of the document D2 passes through the reversing prevention lever 35, the trailing edge of the document D1 stopped by the reversing preventing lever 35 falls onto the discharge tray 16 and the discharge is completed (see FIG. 12H). The back side of the document D2 conveyed to the conveyance path 26 is read.
[0091]
When the registration sensor S5 detects the passage of the trailing edge of the document D2, it is checked whether the empty sensor S4 detects the presence of the next document. The feeding operation of the original D3 is started. The reading operation of the third document D3 is executed by repeating the operation shown in FIGS. 10A to 12H.
[0092]
Thereafter, as long as the empty sensor S4 detects the presence of a document, the same processing is performed on the documents D4, D5,.
[0093]
Similarly, the productivity of double-sided scanning can be significantly improved by simultaneously performing the blank reversal for page alignment of the scanned original and the scanning of the next original as described above, except for the final original. Was.
[0094]
The drive of the conveying motor M2 is stopped after the time required for the last document to be discharged to the paper discharge tray 16 after the discharge sensor S7 detects the trailing end of the last document, and the excitation solenoid SOL is excited. Is canceled, and the processing of all the originals ends.
[0095]
Here, the reading operation when the high-precision reading is selected will be described.
[0096]
First, reading of the first double-sided document will be described. When the empty sensor S4 detects that a document has been placed on the paper feed tray 15, the first document D1 is fed by the forward rotation of the paper feed motor M1 and fed by the feed roller 18 in the same manner as in the single-sided reading mode. The roller 19 is rotated, and the original is pressed against the nip point of the registration roller pair 21 to remove the skew.
[0097]
After the leading edge of the document D1 conveyed by the reverse rotation drive of the paper feed motor M1 and the forward rotation drive of the conveyance motor M2 is detected by the read sensor S6, the paper supply motor M1 and the conveyance motor M2 are temporarily stopped. The document D1 is in a state where the leading end position is stopped before the first platen 2. At this time, the pressure contact solenoid SOL is excited, and the sheet discharge roller pair 24 is pressed (FIG. 13A).
[0098]
When a reading and conveying signal is received from the image reading apparatus main body 1, the conveying motor M2 is driven to rotate forward, so that the surface of the original is sent onto the first platen 2 and is sub-scanned by the reading means and read. The document D1 read by the first platen 2 is guided to the paper discharge path 27.
[0099]
The document D1 guided from the paper discharge path 27 to the paper discharge port 31 is conveyed onto the paper discharge tray 16 by pushing up the front end of the flapper 29 arranged so as to close the paper discharge port 31 with its front end. In this transport state, when the time required for the trailing edge of the document D1 to pass through the position of the flapper 29 after the paper ejection sensor S7 detects the trailing edge of the document D1, the drive of the transport motor M2 is stopped, and The rear end side of D1 is nipped by the paper discharge roller pair 24 and stopped (see FIG. 13B).
[0100]
Thereafter, the transport motor M2 is driven to rotate in the reverse direction. As a result, the paper discharge roller 24a rotates in the reverse direction, the document D1 is switched back, and the document D1 is re-switched from the switchback path 28 along the document guide surface of the flapper 29 that has moved to a position that closes the paper discharge port 31 as the document passes. It is guided to the paper feed path 30. After the leading edge of the document D1 guided to the re-feeding path 30 is detected by the registration sensor S5, the conveyance motor M2 driven in the reverse direction forms a bend at the nip portion of the registration roller pair 21 to remove skew. Thus, the operation is stopped after a predetermined time has elapsed (see FIG. 13C).
[0101]
Then, the sheet feeding motor M1 is driven to rotate in the reverse direction to re-feed the document D1. The reverse rotation of the paper feed motor M1 rotates the registration roller 21a in the paper feeding direction, and after a lapse of time during which the leading end of the document D1 reliably nips the registration roller pair 21, the excitation of the pressure contact solenoid SOL is released, and the paper discharge driven roller 24b is moved downward to separate it from the paper discharge roller 24a, and the transport motor M2 is driven to rotate forward.
[0102]
The document D1 is inverted and fed along the paper feed path 25, and when the leading end is detected by the read sensor S6, the transport motor M2 stops after a predetermined time and stops the paper feed motor M1. Thereafter, the transport motor M2 is driven again by the read transport signal from the image reading apparatus main body 1, and the back surface of the document D1 is sub-scanned and read by the reading means. At this time, the leading edge of the document D1 sent to the paper ejection tray 16 and the trailing edge of the document D1 re-fed are passed by a common part of the paper ejection path 27 including the paper ejection roller pair 24 and the switchback path 28. However, the sheet can be conveyed without any trouble because the sheet discharge roller pair 24 is separated (see FIG. 13D).
[0103]
Thereafter, when the registration sensor S5 detects the trailing end of the document D1, the pressure contact solenoid SOL is excited to press the paper discharge roller pair 24, and a predetermined time has elapsed since the paper discharge sensor S7 detected the rear end of the document D1. After the lapse of time, the drive of the transport motor M2 is stopped, and the rear end of the document D1 is nipped by the discharge roller pair 24 and stopped (see FIG. 13E).
[0104]
Then, the document D1 is inverted by 180 degrees, and the empty feed is performed so that the pages are aligned and discharged to the discharge tray 16. In order to re-feed the document D1, the sheet feeding motor M1 is driven to rotate in the reverse direction. The reverse rotation of the paper feed motor M1 rotates the registration roller 21a in the paper feeding direction, and after a lapse of time during which the leading end of the document D1 reliably nips the registration roller pair 21, the excitation of the pressure contact solenoid SOL is released, and the paper discharge driven roller 24b is moved downward to separate it from the paper discharge roller 24a, and the transport motor M2 is driven to rotate forward.
[0105]
The document D1 is inverted and fed along the paper feed path 25, and is conveyed to the paper discharge path 27. At this time, the leading edge of the document D1 sent to the paper ejection tray 16 and the trailing edge of the document D1 re-fed are passed by a common part of the paper ejection path 27 including the paper ejection roller pair 24 and the switchback path 28. However, the sheet can be conveyed without any trouble because the sheet discharging roller pair 24 is separated (see FIG. 13D).
[0106]
The document D1 guided from the paper discharge path 27 to the paper discharge port 31 is conveyed onto the paper discharge tray 16 by pushing up the front end of the flapper 29 arranged so as to close the paper discharge port 31 with the front end of the document D1. . In this transport state, when it is detected that the rear end of the document D1 has passed the transport roller pair 23, the document D1 is transported at the peripheral speed of the paper discharge roller 24a (first paper discharge roller) (FIG. 14). (F)).
[0107]
Next, when the registration sensor S5 detects the passage of the rear end of the document D1, it is checked whether or not the empty sensor S4 detects the presence of the next document. The paper feeding operation is started (see FIG. 13G).
[0108]
The trailing end of the document D1 falls onto the discharge tray 16 and the discharge is completed (see FIG. 13H).
[0109]
In the same manner as in the first document, the feeding roller 18 and the paper feeding roller 19 are rotated by the forward rotation of the paper feeding motor M1, and the skew is removed from the second document D2 by abutting the document against the nip point of the registration roller pair 21. Then, the leading end of the document D2 conveyed by the reverse rotation drive of the paper feed motor M1 and the forward rotation drive of the conveyance motor M2 is nipped by the registration roller pair 21 and temporarily stopped (see FIG. 13A).
[0110]
Thereafter, after reading the front and back of the second document D2 by the same operation as the first document D1, the document D2 is turned 180 degrees, and the pages are aligned in the discharge tray 16 and discharged. Perform an empty feed.
[0111]
When the registration sensor S5 detects the passage of the trailing edge of the document D2, it is checked whether the empty sensor S4 detects the presence of the next document. The feeding operation of the original D3 is started. The reading operation of the third document D3 is performed by repeating the operation shown in FIGS. 13A to 15H.
[0112]
Thereafter, as long as the empty sensor S4 detects the presence of a document, the same processing is performed on the documents D4, D5,.
[0113]
In this manner, in high-precision reading, since the originals are transported one by one and read, the original surface facing the original to be read which occurs when two sheets are transported in high-speed reading may be read through. Disappears. Therefore, a clear and high-precision image can be obtained.
[0114]
The drive of the conveying motor M2 is stopped after the time required for the last document to be discharged to the paper discharge tray 16 after the discharge sensor S7 detects the trailing end of the last document, and the excitation solenoid SOL is excited. Is canceled, and the processing of all the originals ends.
[0115]
FIG. 16 is a flowchart illustrating a flow of an example of a document conveying process in high-speed reading. With reference to FIG. 16, the flow of the double-sided reading document conveying process will be described.
[0116]
First, an operation of reading the first document is performed. The document placed on the paper feed tray is fed to a predetermined paper feed position (ST1). The document fed to the paper feed position is transported to the reading position (ST2).
[0117]
One side of the document conveyed to the predetermined reading position is read (ST3). The document whose one side has been read is switched back and reversed (ST4). The original that has been switched back and inverted is fed again to the feed position (ST5).
[0118]
The original whose one side has been read is conveyed, and the other side of the original is read (ST6). The original after the double-sided reading is switched back again and inverted (ST7). The document for which double-sided reading has been completed is transported again to the paper feed position (ST8).
[0119]
The document on which double-sided reading has been completed is conveyed via the reading position in a state of being overlapped with the next fed document (second document) (ST9). Here, one side of the next fed document is read (ST10).
[0120]
At the paper feed position, the leading end of the original (the first original) for which both-side reading has been completed is shifted backward by a predetermined distance from the leading end of the next original (the second original). It is transported in a state. Next, the document whose one side of the fed document is read is switched back and sent to the paper feeding position (ST11). The document (first document) for which double-sided reading has been completed is discharged (ST12).
[0121]
Next, the other side of the original (second original) that has been fed and whose one side has been read is read (ST13). If there is an original to be read further, the processing steps ST7 to ST11 are repeatedly executed (ST14). If there is no document, the last document read is switched back, inverted, and fed idle to discharge (ST15).
[0122]
Here, still another embodiment according to the present invention will be described. FIG. 17 and FIG. 18 are cross-sectional views illustrating a second example of the ADF 10.
[0123]
The second embodiment of the ADF 10 will be specifically described with reference to FIGS. The reading of the first document is the same as in the first embodiment, and a description thereof will be omitted.
[0124]
In the second embodiment, the read original D1 conveyed to the paper discharge path 27 is driven in the reverse direction by the conveyance motor M2 to be conveyed from the switchback path 28 to the re-feed path 30, and The skew is removed by abutting the leading end of the document D1 on the nip portion (see FIG. 17A). The leading end is conveyed by a certain distance (a distance of “Z” shown in FIG. 17B) from the registration roller pair 21 and is temporarily stopped.
[0125]
Next, as in the case of the first document D2, the feed roller 18 and the paper feed roller 19 are rotated by the forward rotation of the paper feed motor M1 so that the document is brought into contact with the nip point of the registration roller pair 21. The skew is removed, and the sheet is conveyed in the reading position direction by the reverse rotation driving of the sheet feeding motor M1 and the normal rotation driving of the conveyance motor M2.
[0126]
In this case, the first document D1 is transported ahead of the second document D2, and the direction of deviation between the first document D1 and the second document D2 is opposite to that in the first embodiment. It has become. (Refer to FIG. 17 (b), deviation amount: Z).
[0127]
The document D2 is simultaneously fed by the reverse rotation drive of the paper feed motor M1 and the forward rotation drive of the transport motor M2 in a state where the document D1 is overlapped with the document D1, and the drive of the paper feed motor M1 is stopped by the lead sensor S6 detecting the leading end of the document D1. I do. After the leading end is detected by the lead sensor S6, the sheet feeding motor M1 and the conveying motor M2 are temporarily stopped, and the leading end of the document D1 is stopped short of the first platen 2. At this time, the pressure contact solenoid SOL is excited, and the sheet discharge roller pair 24 is pressed.
[0128]
The reading start position is pulse-counted from the leading edge of the document D1 by the set deviation amount to specify the reading start position and start reading.
[0129]
Then, upon receiving a reading / conveying signal from the image reading apparatus main body 1, the front surface of the document D <b> 2 is sent onto the first platen 2 by the forward rotation of the conveying motor M <b> 2, and is sub-scanned and read by the reading unit. (See FIG. 17 (c)).
[0130]
The document D1 sent together with the document D2 read by the first platen 2 is guided to the paper discharge path 27. The peripheral speeds of the discharge rollers 24a and 24b are the same, and there is no speed difference.
[0131]
The document D1, which is conveyed together with the document D2 guided from the paper discharge path 27 to the paper discharge port 31, pushes up the front end of the flapper 29 disposed so as to close the paper discharge port 31 with the front end of the document D1, and discharges the document D1. The paper is conveyed onto the paper tray 16.
[0132]
When the paper discharge sensor S7 detects the rear end of the document D1 and then detects that the rear end of the document D1 has passed the position of the reverse prevention lever 35 provided downstream of the flapper 29, the drive of the transport motor M2 is stopped. The document D2 is nipped at the trailing end by the paper discharge roller pair 24 and stopped (see FIG. 18D).
[0133]
Thereafter, the transport motor M2 is driven to rotate in the reverse direction. As a result, the discharge rollers 24a and 24b rotate in the reverse direction, the document D1 is stopped by the reverse prevention lever 35, only the document D2 is switched back, and the flapper is moved to a position to close the discharge port 31 as the document passes. The document is guided to the switchback path 28 along the document guide surface 29 (FIG. 18E).
[0134]
After the leading edge of the document D2 guided from the switchback path 28 to the re-feed path 30 is detected by the registration sensor S5, the conveyance motor M2 driven in the reverse direction forms a deflection at the nip portion of the registration roller pair 21, The skew is removed and the operation is stopped after a predetermined time has elapsed.
[0135]
Then, the sheet feeding motor M1 is driven to rotate in the reverse direction to re-feed the document D2. The registration roller 21a is rotated in the paper feeding direction by the reverse rotation of the paper feeding motor M1, and after a lapse of time during which the leading end of the document D2 reliably nips the registration roller pair 21, the excitation of the pressure contact solenoid SOL is released, and the paper discharging roller 24b is released. Is moved downward to separate it from the paper discharge roller 24a, and the transport motor M2 is rotated forward. When the trailing edge of the document D2 passes through the reversing prevention lever 35, the trailing edge of the document D1 stopped by the reversing preventing lever 35 falls to the paper discharge tray 16 and the discharge is completed (see FIG. 18F).
[0136]
The document D2 is transported to the transport path 26, and the back surface of the document D2 is read by the same operation as that for reading the front surface.
[0137]
In the second embodiment, since the rear end of the document D1 precedes the rear end of the document D2, the document D1 can be discharged without providing a speed difference between the discharge rollers 24a and 24b.
[0138]
19 and 20 are cross-sectional views illustrating a third embodiment of the ADF 10.
[0139]
A third embodiment of the ADF 10 will be specifically described with reference to FIGS. The reading of the first document is the same as in the first embodiment, and a description thereof will be omitted.
[0140]
In the third embodiment, speed differences are provided to all of the registration rollers 21a and 21b, the conveyance rollers 22a and 22b, the conveyance rollers 23a and 23b, and the paper discharge rollers 24a and 24b. The speed difference is such that the registration rollers 21a> 21b, the conveyance rollers 22a> 22b, and the conveyance rollers 23a> 23b, and the registration rollers 21a, the conveyance rollers 23a, and the conveyance rollers 22a have built-in torque limiters.
[0141]
In the third embodiment, the feeding roller 18 and the feeding roller 19 of the second original D2 are rotated by the forward rotation of the feeding motor M1 in the same manner as the first original, and the nip point of the registration roller pair 21 is adjusted. The original D2 is transported by the reverse rotation of the paper feed motor M1 and the forward rotation of the transport motor M2 to remove the skew by abutting the original, and the leading end of the original D2 is conveyed by a certain distance from the registration roller pair 21 (FIG. 19A). (The distance of “Z” shown in FIG. 2) and is temporarily stopped.
[0142]
The document D1 is driven in the reverse direction by the conveyance motor M2 to be conveyed from the switchback path 28 to the sheet re-feeding path 30, where the skew is eliminated by abutting the leading end of the document D1 on the nip portion of the registration roller pair 21 (FIG. )reference). Incidentally, when only the read original is present (when one sheet is conveyed), the discharge roller 24b is driven by the speed of the discharge roller 24a by the torque limiter.
[0143]
The document D2 is simultaneously fed two sheets in a state of being superimposed on the document D1 by the reverse rotation driving of the sheet feeding motor M1 and the normal rotation driving of the conveyance motor M2, and the driving of the sheet feeding motor M1 is stopped by the lead sensor S6 detecting the leading end of the document D2. . After the leading end is detected by the lead sensor S6, the sheet feeding motor M1 and the transport motor M2 are temporarily stopped, and the leading end of the document D2 is stopped before the first platen 2. At this time, the pressure contact solenoid SOL is excited, and the sheet discharge roller pair 24 is pressed.
[0144]
Since the speed of each roller pair is such that the registration rollers 21a> 21b and the conveyance rollers 22a> 22b, when the documents D1 and D2 are conveyed to the reading position, the leading ends of the documents D1 and D2 are aligned (FIG. 19B). reference).
[0145]
Then, upon receiving a reading / conveying signal from the image reading apparatus main body 1, the front surface of the document D <b> 2 is sent onto the first platen 2 by the forward rotation of the conveying motor M <b> 2, and is sub-scanned and read by the reading unit. .
[0146]
The document D1 sent together with the document D2 read by the first platen 2 is guided to the paper discharge path 27. (See FIG. 19 (c))
At this point, the leading edge of the original D1 being fed together with the original D2 guided to the paper discharge path 27 is ahead of the original D2, and the flapper 29 is disposed so as to close the paper discharge port 31 with the distal end of the original D1. Is pushed up to be conveyed onto the discharge tray 16.
[0147]
When the paper discharge sensor S7 detects the rear end of the document D1 and then detects that the rear end of the document D1 has passed the position of the reverse return prevention lever 35 provided downstream of the flapper 29, the driving of the transport motor M2 is stopped, and the document D2 is stopped. The rear end side is nipped by the paper discharge roller pair 24 and stopped (see FIG. 20D).
[0148]
Thereafter, the transport motor M2 is driven to rotate in the reverse direction. As a result, the discharge rollers 24a and 24b rotate in the reverse direction, the document D1 is stopped by the reverse prevention lever 35, only the document D2 is switched back, and the flapper is moved to a position to close the discharge port 31 as the document passes. The document is guided to the switchback path 28 along the document guide surface 29 (FIG. 20E).
[0149]
After the leading edge of the document D2 guided from the switchback path 28 to the re-feed path 30 is detected by the registration sensor S5, the conveyance motor M2 driven in the reverse direction forms a deflection at the nip portion of the registration roller pair 21, The skew is removed and the operation is stopped after a predetermined time has elapsed.
[0150]
Then, the sheet feeding motor M1 is driven to rotate in the reverse direction to re-feed the document D2. The registration roller 21a is rotated in the paper feeding direction by the reverse rotation of the paper feeding motor M1, and after a lapse of time during which the leading end of the document D2 reliably nips the registration roller pair 21, the excitation of the pressure contact solenoid SOL is released, and the paper discharging roller 24b is released. Is moved downward to separate it from the paper discharge roller 24a, and the transport motor M2 is rotated forward. When the trailing end of the document D2 passes through the reversing prevention lever 35, the trailing end of the document D1 stopped by the reversing preventing lever 35 falls onto the discharge tray 16 and the discharge is completed (see FIG. 20F).
[0151]
The document D2 is conveyed onto the first platen, the back side is read, and conveyed to the paper discharge path 27.
[0152]
As described above, in the third embodiment, the original D2 is shifted from the position where the leading end of the original D2 has passed the read sensor S6 to the switchback point (the original D2 can be moved ahead from the original D1 registration to the read sensor). (The amount is set.) The rear end of the document D1 can be made to precede the rear end of the document D2.
[0153]
As described above in detail, the document feeder of the present invention feeds the documents placed on the feed tray and feeds the documents placed on the feed tray one by one to a predetermined feed position. Paper feeding means for feeding paper, transport means for transporting the fed document from the paper feeding position to the paper output port via the reading position, and a paper feeding means provided in the paper output direction of the paper output port to switch back the document. A switchback path for reversing the original, a refeed path for guiding the original switched back and reversed in the switchback path to the paper supply position again, and a switchback path provided at a downstream end of the switchback path. A paper discharge means for discharging the read document onto a paper discharge tray, wherein the document on which double-sided reading has been completed is sent to the paper feed position via the switchback path; Is then fed and read That is conveyed through the reading position the original and in the superimposed state, and wherein the ejected by the paper ejection means via said discharge outlet.
[0154]
In the document feeder and the document feed method according to the present invention, the feeding and reading for reading the next document can be performed by superimposing and sending the next document to be read, which has been read in order to perform page alignment. It is now possible to carry out idle feeding of completed documents at the same time. This enables a two-sided reading operation in which the page order of the read document is set to the original order without being reversed.
[0155]
Further, in order to read a double-sided original, it is necessary to convey the original to the reading position of front side reading, back side reading, idle feeding, and three times, but in the present invention, since the reading can be completed by two times of conveyance, both sides are read. It has become possible to speed up the reading operation.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an ADF mounted on an image reading apparatus according to the present invention.
FIG. 2 shows an enlarged sectional view of the ADF shown in FIG.
FIG. 3 is a drive diagram (No. 1) of the ADF shown in FIG. 1;
FIG. 4 shows a drive diagram (part 2) of the ADF shown in FIG.
FIG. 5 is an enlarged view of a transport document detecting unit according to the ADF shown in FIG. 1;
FIG. 6 is a diagram (part 1) schematically showing a document conveyance state in the single-sided reading mode of the ADF shown in FIG. 1;
FIG. 7 is a diagram (part 2) schematically showing a document conveyance state in the single-sided reading mode of the ADF shown in FIG. 1;
FIG. 8 is a diagram (part 1) schematically showing a document conveyance state in a double-sided reading mode in ADF high-speed reading according to the first embodiment.
FIG. 9 is a diagram (part 2) schematically showing a document conveyance state in the double-sided reading mode in the ADF high-speed reading according to the first embodiment.
FIG. 10 is a diagram (part 3) schematically showing a document conveyance state in a double-sided reading mode in ADF high-speed reading according to the first embodiment.
FIG. 11 is a diagram (part 4) schematically showing the state of document transport in the double-sided reading mode in the ADF high-speed reading according to the first embodiment.
FIG. 12 is a view (No. 5) schematically showing a document conveyance state in the double-sided reading mode in the ADF high-speed reading in the first embodiment.
FIG. 13 is a diagram (part 1) schematically showing a document conveyance state in the double-sided reading mode of the ADF in high-precision reading.
FIG. 14 is a diagram (part 2) schematically showing a document conveyance state in the double-sided reading mode of the ADF in high-accuracy reading.
FIG. 15 is a diagram (part 3) schematically showing a document conveyance state in the double-sided reading mode of the ADF in high-precision reading.
FIG. 16 is a flowchart illustrating a flow of an example of a document conveying process according to the present invention.
FIG. 17 is a diagram (part 1) schematically showing a document conveyance state in the double-sided reading mode of the ADF according to the second embodiment.
FIG. 18 is a diagram (part 2) schematically showing the state of document transport in the double-sided reading mode of the ADF according to the second embodiment.
FIG. 19 is a diagram (part 1) schematically showing a document conveyance state in the double-sided reading mode of the ADF in the third embodiment.
FIG. 20 is a diagram (part 2) schematically showing a document conveyance state in the double-sided reading mode of the ADF in the third embodiment.
[Explanation of symbols]
2 First platen
10 Automatic Document Feeder (ADF)
10b Exterior cover
11 Paper feed unit
12 Transport unit
13 Paper output unit
14 Switchback section
15 Paper tray
16 Output tray
25 Paper feed path
25a Paper feed guide
25b Paper lower guide
25c protrusion
35 Reverse return prevention lever
S6 Lead sensor
S6a Sensor lever
S6c Sensor flag
S6d Sensor body

Claims (12)

  1. A paper feed tray for placing documents,
    Paper feeding means for feeding out a document placed on the paper feeding tray one sheet at a time and feeding it to a predetermined paper feeding position;
    Conveying means for conveying the fed document from the paper feeding position to the paper output port via the reading position;
    A switchback path provided in the paper discharge direction of the paper discharge port, for switching back and inverting the original;
    A re-feeding path for guiding the original switched back and reversed in the switch-back path to the sheet feeding position again,
    Discharging means provided at a downstream end of the switchback path, for discharging a document after image reading onto a discharge tray,
    The document for which double-sided reading has been completed is sent to the sheet feeding position via the switchback path, and is conveyed via the reading position in a state of being overlapped with a document to be fed and read next by the sheet feeding means. And a sheet is discharged by the sheet discharging means via the sheet discharging port.
  2. 2. The document that has been subjected to the double-sided reading is conveyed in a state where the leading edge of the document is shifted backward by a predetermined distance from the leading edge of the next document to be read at the sheet feeding position. 2. The document transport device according to 1.
  3. 2. The discharge device according to claim 1, wherein the discharge unit includes a discharge roller pair rotatable at different rotation speeds to discharge the document on which the double-side reading has been completed to the discharge tray. 3. Document feeder.
  4. The discharge roller pair includes a first discharge roller that contacts a document that has been subjected to the double-sided reading of the stacked documents and a second discharge roller that contacts the next document to be read. 4. The document feeder according to claim 3, wherein when the document on which both-side reading has been completed is discharged onto the discharge tray, the first discharge roller rotates at a higher speed than the second roller. 5. apparatus.
  5. The discharge roller pair detects that the document on which the double-sided reading has been completed has passed through the discharge roller pair, and then reverses the rotation direction to switch back the next document to be read to thereby supply the document. The document feeder according to claim 3, wherein the document is fed to a paper position.
  6. The discharge roller pair includes a reverse prevention lever that stops a rear end of the document so that the read document does not switch back when the rotation direction of the discharge roller pair is reversed. The document transport device according to claim 1, wherein
  7. Feeding a document placed on a paper feed tray to a predetermined paper feed position;
    Transporting the fed document,
    Reading one side of the document conveyed to a predetermined reading position;
    A step of switching back and reversing the original whose one side has been read;
    Feeding the switched back inverted document to the paper feeding position again;
    Conveying the document whose one surface has been read and reading the other surface of the document,
    A step of switching back and reversing the original after the double-sided reading has been completed;
    Re-sending the original after the double-sided reading to the sheet feeding position;
    Transporting the original after completion of the double-sided reading via the reading position in a state of being overlapped with the next fed original;
    Discharging the original after the double-sided reading is completed;
    Each of the steps,
    A document reading method for reading one side of the next-fed document in the step of transporting the document for which double-side reading has been completed in a state of being superimposed on the next fed document; .
  8. In the step of transporting the original after completion of the double-sided reading via the reading position in a state of being overlapped with the original fed next,
    8. The document according to claim 7, wherein the document on which the double-sided reading has been completed is conveyed in a state where the leading end of the document is shifted backward by a predetermined distance from the leading end of the next fed document at the sheet feeding position. Document transport method.
  9. After the step of discharging the original after the double-sided reading is completed, the method further comprises a step of switching back the original whose one side of the next fed original has been read and sending the original to the paper supply position. The document conveying method according to claim 7, wherein:
  10. 10. The document conveying method according to claim 9, further comprising the step of reading the other side of the document which is fed next and one side of which is read.
  11. Conveying means for feeding out the original one by one and conveying the original to a predetermined reading position;
    Reading means for reading a document image moving the reading position,
    A switchback path for switching the front and back of the document read at the reading position, reversing the front and back, and re-feeding the document to the reading position;
    Paper discharge means for discharging the read original,
    The document is conveyed twice from the reading position to the switchback path, and the front and back sides of the document are read by the reading means. Thereafter, the read document is superimposed on the next fed document, and then conveyed to the reading position. An image reading apparatus, comprising: a control unit that reads the next fed sheet of original document conveyed in an overlapping manner by the reading unit.
  12. The control means conveys the document twice from the reading position to the switchback path, performs reading of the front and back sides of the document by the reading means, and then superimposes the read document and the next fed document. Conveyed together to the reading position, and controlling the reading means to read the next fed sheet of original document conveyed in an overlapped manner;
    The document is conveyed twice from the reading position to the switchback path, the reading of the front and back sides of the document is performed by the reading unit, and the document that has been read is turned upside down, discharged by the discharging unit, and then fed again. The image reading apparatus according to claim 11, wherein the control unit can selectively perform the control of reading the original.
JP2002339943A 2002-11-22 2002-11-22 Document conveying apparatus, document conveying method, and image reading apparatus Expired - Fee Related JP3689081B2 (en)

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US10/713,153 US20040140606A1 (en) 2002-11-22 2003-11-17 Original transport apparatus, original transport method and image reading apparatus

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