US20010048830A1 - Image scanning apparatus - Google Patents
Image scanning apparatus Download PDFInfo
- Publication number
- US20010048830A1 US20010048830A1 US09/875,386 US87538601A US2001048830A1 US 20010048830 A1 US20010048830 A1 US 20010048830A1 US 87538601 A US87538601 A US 87538601A US 2001048830 A1 US2001048830 A1 US 2001048830A1
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- United States
- Prior art keywords
- sheet
- roller
- scanning
- scanner
- guide member
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/00567—Handling of original or reproduction media, e.g. cutting, separating, stacking
- H04N1/0057—Conveying sheets before or after scanning
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
- G03G15/23—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 specially adapted for copying both sides of an original or for copying on both sides of a recording or image-receiving material
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/00567—Handling of original or reproduction media, e.g. cutting, separating, stacking
- H04N1/0057—Conveying sheets before or after scanning
- H04N1/00572—Conveying sheets before or after scanning with refeeding for double-sided scanning, e.g. using one scanning head for both sides of a sheet
- H04N1/00575—Inverting the sheet prior to refeeding
- H04N1/00578—Inverting the sheet prior to refeeding using at least part of a loop, e.g. using a return loop
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/00567—Handling of original or reproduction media, e.g. cutting, separating, stacking
- H04N1/0057—Conveying sheets before or after scanning
- H04N1/00572—Conveying sheets before or after scanning with refeeding for double-sided scanning, e.g. using one scanning head for both sides of a sheet
- H04N1/00575—Inverting the sheet prior to refeeding
- H04N1/0058—Inverting the sheet prior to refeeding using at least one dead-end path, e.g. using a sheet ejection path
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/00567—Handling of original or reproduction media, e.g. cutting, separating, stacking
- H04N1/0057—Conveying sheets before or after scanning
- H04N1/00588—Conveying sheets before or after scanning to the scanning position
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/00567—Handling of original or reproduction media, e.g. cutting, separating, stacking
- H04N1/0057—Conveying sheets before or after scanning
- H04N1/00591—Conveying sheets before or after scanning from the scanning position
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/00567—Handling of original or reproduction media, e.g. cutting, separating, stacking
- H04N1/0057—Conveying sheets before or after scanning
- H04N1/00599—Using specific components
- H04N1/00602—Feed rollers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/00567—Handling of original or reproduction media, e.g. cutting, separating, stacking
- H04N1/00628—Separating, e.g. preventing feeding of two sheets at a time
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/00567—Handling of original or reproduction media, e.g. cutting, separating, stacking
- H04N1/00657—Compensating for different handling speeds of different apparatus or arrangements for handling a plurality of sheets simultaneously, e.g. mechanical buffering
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/00795—Reading arrangements
- H04N1/00798—Circuits or arrangements for the control thereof, e.g. using a programmed control device or according to a measured quantity
- H04N1/00822—Selecting or setting a particular reading mode, e.g. from amongst a plurality of modes, simplex or duplex, or high or low resolution
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S271/00—Sheet feeding or delivering
- Y10S271/902—Reverse direction of sheet movement
Definitions
- Three rollers may be arranged to form two pairs of rollers, and one of the two pairs of rollers may constitute the transportation means whereas the other pair of rollers may constitute the reversing means. The latter pair of rollers may also constitute the discharging means.
- FIG. 1 illustrates a perspective view of a facsimile machine incorporating an image scanning device according to a first embodiment of the present invention
- FIG. 4 illustrates a lateral view of a second guide member and associated elements
- FIG. 12 illustrates a front half of a control loop according to the first embodiment
- FIG. 13 illustrates a second half of the control loop
- FIG. 16 illustrates a flowchart of an operation performed by an image scanning device of the second embodiment
- a facsimile machine that includes a scanner part 1 and a printer part 2 below the scanner part.
- the printer part 2 includes a printer module 3 and a paper cassette 4 below the printer module. Sheets stacked in the paper cassette 4 are transferred to the printer module 3 , and discharged onto a discharge tray 5 after printing.
- a document cover 7 lies over the bed 11 such that it can pivot up and down about one edge thereof.
- the original document situated on the transparent bed 11 is pressed by the document cover 7 from the top.
- An automatic document feeder (ADF) 8 is attached near the edge of the document cover 7 .
- An outer contour or appearance of ADF 8 is defined by the document cover 7 and a pair of side frames 7 a and 7 b as shown in FIG. 1.
- the document cover 7 and side frames 7 a , 7 b are arranged side by side in a direction perpendicular to the scanning direction.
- Between the side frames 7 a and 7 b disposed is an ADF cover 14 that covers a main mechanism of ADF 8 .
- the ADF cover 14 is openable.
- Metallic plates stand inside the side frames 7 a and 7 b such that they support ends of feed rollers.
- the cover 7 and one or both of the side frames 7 a and 7 b house in combination a drive source (e.g., motor) adapted to rotate drive rollers (e.g., paper feed rollers) and associated parts such as chains, sprockets, gears, etc.
- a drive source e.g., motor
- drive rollers e.g., paper feed rollers
- associated parts such as chains, sprockets, gears, etc.
- ADF 8 includes an outer frame constituted by the cover 7 and side frames 7 a and 7 b , and a document feeder part located inside the outer frame and covered with the ADF cover 14 .
- An original paper feed tray 9 is disposed above the document cover 7 such that it continues to a paper inlet 8 a of ADF 8 .
- An original paper discharge tray 7 c lies below the original paper feed tray 9 .
- This tray 7 c defines an upper surface of the document cover 7 and is continuous to an outlet opening 8 b of ADF 8 , which opens below the paper inlet 8 a .
- a paper path is formed inside ADF 8 such that it extends from the paper inlet 8 a to the outlet 8 b.
- the scanner part 1 can therefore be used as a flat bed scanner that scans a stationary original document with a moving scanner 6 and a sheet feed scanner that scans a moving original document with a stationary scanner 6 .
- the scanner casing 10 has an operation panel 13 with a number of keys and buttons. By pressing these keys, a user can instruct the machine to scan an original document and enter a facsimile (or telephone) number so as to transmit the scanned image to a remote machine via facsimile. The user is also able to instruct the printer 3 to print the scanned image. Of course, the user can instruct the machine to perform other functions.
- the “forward position” is a position of the paper inlet 8 a or that of the outlet 8 b (i.e., rightward position)
- the “backward position” is a position of a 180-degree turning portion of the paper path (i.e., leftward position).
- the original paper moves from the forward position ( 8 a ) toward the backward position and returns to the forward position ( 8 b ).
- Directions perpendicular to the drawing sheet are right and left directions. It should be assumed that the ADF cover 14 is closed and nothing is placed on the transparent bed 11 with the document cover 7 put on the top of the scanner casing 10 as shown in FIG. 2 unless otherwise mentioned.
- a first “C” shaped paper path R 1 extends from the paper inlet 8 a to a roller 33 in ADF when viewed laterally, and a discharge path R 3 extends from the roller 33 (or platen glass 12 ) to the paper outlet 8 b .
- Downstream of the separate roller 22 provided are feed rollers 24 and 25 for transmitting the original paper in the first paper path R 1 from the nip between the separate roller 22 and retard roller 23 .
- a roller 27 is a first press roller.
- a return path R 4 extends from the end of a second paper path R 2 towards the feed roller 28 and connects to the first paper path R 1 .
- a conjunction path R 5 extends from the end of the discharge path R 3 and meets the return path R 4 .
- the second press roller 29 is lifted up and down by a cam mechanism (not shown) so that it can contact and leave the extra roller 26 .
- a first position sensor 35 is disposed on the second paper path R 2 between the nip of the slave feed roller 24 and master feed roller 25 and the nip of the extra roller 26 and first press roller 27 , and a second position sensor 36 is disposed near a merge of the first paper path R 1 and return path R 4 so as to detect the paper passing thereover respectively.
- a controller 40 of the image scanning machine will now be described.
- Each of the sensors 35 and 36 is an optical sensor or limit switch, that includes a light emitting element located on one side of the paper path and a light receiving element on the other side. Each of these sensors detects the passing period of the document and issues a control signal (detection signal) to the controller 40 .
- a lift mechanism of the second press roller 29 which includes a cam mechanism and other elements, can move up and down in accordance with control signals from the controller 40 .
- the first original sheet that moves backwards is caught by the giant feed roller 28 and first press roller 31 .
- the “front” end (this end is the “rear” end previously) of the first original sheet is detected by the second sensor 36 (Step S 10 )
- a detection signal is sent to the controller 40 .
- the controller 40 then instructs the scanner 6 to start the scanning operation.
- the controller 40 uses the second angular sensor 48 to calculate a rotation angle (second rotation angle) of the giant feed roller 28 corresponding to the moving distance of the front end of the sheet from the position of the second sensor 36 to the rear end of the platen glass 12 .
- a rotation angle second rotation angle
- the scanning of the back side of the first original sheet is started (Step S 12 ).
- the first original sheet is moved by the giant feed roller 28 and second slave roller 32 or third slave roller 33 .
- the detection signal is sent to the controller 40 .
- the controller 40 then issues a control signal to the scanner 6 to terminate the scanning. After that, the controller 40 issues control signals to the extra roller 26 , third guide roller 39 and the power transmission mechanism 42 of the drive source 41 respectively.
- the controller 40 uses the angular sensor 48 to measure a rotation angle (third rotation angle; greater than the second rotation angle) of the giant feed roller 28 corresponding to the moving distance of the sheet rear end from the second position sensor's position to the front end of the platen glass 12 , and a rotation angle (fourth rotation angle) of the giant feed roller 28 corresponding to the moving distance of the sheet rear end from the second position sensor's position to a mid point between the third guide member 39 and the nip of the extra roller 26 and second press roller 29 .
- the third rotation angle is reached (Step S 14 )
- the scanning of the back side of the first original sheet is finished (Step S 15 ).
- Step S 16 When the fourth rotation angle is detected by the angular sensor 38 (Step S 16 ), most of the first original sheet is discharged from the exit 8 b and the rear end of the sheet is only nipped between the extra roller 26 and the second press roller 29 . At this point, the extra roller 26 is caused to stop rotating (Step S 17 ). Further, the third guide member 39 is switched to the lower position E in order not to allow the sheet to move reversally toward the third slave roller 33 (Step S 18 ).
- the pick-up roller 21 , separate roller 2 and retard roller 23 pick up a currently uppermost sheet (second original sheet) from the paper stack and feed it into the paper path from the inlet 8 a (Step S 19 ).
- the extra roller 26 starts rotating in the normal direction (clockwise in FIG. 3) (Step S 20 ).
- This sheet is further transported by the master feed roller 25 and slave feed roller 24 so that the sheet reaches the second paper path R 2 .
- the front end of the second original sheet is detected by the first position sensor 35 (Step S 21 ), and the sheet is further transported by the extra roller 26 and first press roller 27 such that it is discharged from the exit 8 c into the space above the discharge tray 7 c.
- the extra roller 26 rotates in the normal direction at Step S 20 , the first original sheet is also transported backwards; it moves in the fourth paper path R 4 and caught by the giant feed roller 28 and first slave roller 31 .
- the detection signal is sent to the controller 40 .
- the controller 40 then instructs the lift mechanism 43 of the second press roller 29 to move down and the scanner 6 to scan the sheet.
- the controller 40 then immediately instructs the third guide member 39 to move to the opposite position.
- the second press roller 29 is moved down so that it is separated from the extra roller 26 (Step S 23 ). If the length of the sheet is greater than the total lengths of the paper paths R 5 , R 4 and R 3 , the front end of the sheet reaches or returns to the rollers 26 and 29 when the rear end of the same sheet is still nipped between the rollers 26 and 29 . In order to allow the front end of the sheet to move further, the rollers 26 and 29 are spaced from each other. After Step S 23 , the sheet front end can smoothly pass between the rollers 26 and 29 . The sheet is transported by the rollers 28 and 31 even after a gap is created between the rollers 26 and 29 .
- the first original document is transported by the giant feed roller 28 and second slave roller 32 or third slave roller 33 .
- the controller 40 causes the angular sensor 48 to measure the rotation angle of the giant feed roller 28 .
- a control signal is issued to the scanning unit 6 to stop the scanning so that the scanning of the front side of the first original document is complete (Step S 29 ).
- the program returns to Step S 10 to perform the scanning operation to the second original document.
- the scanning operation itself is the same as that applied to the first original document.
- the first original document is further transported towards the discharge tray 7 c by the extra roller 26 and second press roller 29 since the extra roller 26 starts rotating in the reverse direction at Step S 32 .
- Step S 21 A flowchart for the last original sheet will be described.
- the first position sensor 35 does not detect passage of the original sheet within a predetermined period (Step S 21 )
- the controller 40 measures the fourth rotation angle of the giant feed roller 28 with the angular sensor 48 at Step S 16 in FIG. 11, and further measures a predetermined angle
- the last original sheet moved backward at Step S 20 proceeds in the fifth paper path R 5 and is transported by the giant feed roller 28 and first slave roller 31 .
- Step S 35 a detection signal is output to the controller 40 as shown in FIG. 14.
- the controller 40 instructs the second press roller lift mechanism 43 to move downward and the scanner 6 to start scanning.
- the controller 40 instructs the third guide member 39 to switch to the other position.
- the second press roller 29 is lowered so that the extra roller 26 is separated from the second press roller 29 (Step S 36 ).
- the extra roller is caused to rotate in the reverse direction (counterclockwise in FIG. 3) (Step S 41 ) and the second press roller 29 is moved upward such that it contacts the extra roller 26 again (Step S 42 ).
- the controller 40 measures the rotation angle of the giant feed roller 28 using the angular sensor 48 .
- the scanning to the last original sheet is completed (Step S 44 ).
- the controller 40 stops all the rollers after a predetermined period (Step S 45 ). Specifically, the controller 40 deactivates the rollers after it measures the fourth rotation angle of the giant feed roller 28 with the angular sensor 48 and further measures a predetermined rotation.
- the front and rear ends of the original document after the first side scanning are transported by the extra roller 26 and second press roller 29 (both of them are the reversing means) and the extra roller 21 and first press roller 27 (both of them are the transportation means).
- the front and rear ends of the original sheet are transported by the extra roller 26 and second press roller 29 (both of them are the reversing means).
- the transportation directions are opposite each other. In the illustrated embodiment, therefore, the extra roller 26 and first press roller 27 (transportation means) are made always contact each other whereas the extra roller 26 and second press roller 29 (reversing means) can contact and leave each other.
- the extra roller 26 is separated from the second press roller 29 , and the front and rear ends of the original sheet after the second side scanning are transported by other rollers 28 , 31 , 32 , 33 .
- the rollers 26 and 29 should be spaced from each other when the length of the sheet is greater than the total length of the paper paths R 5 , R 4 and R 3 .
- the first press roller 27 in press contact with the rotating extra roller 26 rotates about the shaft 27 a .
- the second guide member 38 is also pivotable about the roller shaft 27 a . By this pivot movement, the second guide member 38 can move between the positions “c” and “d”.
- a force exerted by the upper stop pin 38 b that prohibits the second guide member 38 from pivoting further upward is greater than an upward pivoting force applied to the second guide member 38 by the friction force from the friction member 65 .
- the second guide member 38 stops pivoting at the position “d”, and the biasing member 63 keeps rotating in the direction q 2 together with the casing 62 .
- the original sheet transported in the second paper path R 2 can easily be transferred to the scanner 6 .
- ADF 8 has a first paper path R 1 which extends from the paper inlet 8 a to the paper outlet 8 b and is generally shaped “C” as viewed laterally, and a second paper path R 2 ′ which is generally shaped “ ⁇ ” between the paper inlet 8 a and outlet 8 b .
- the extra roller 26 is disposed near the paper exit 8 b
- the press roller 29 is disposed below the extra roller 26 .
- the nip between the separate roller 22 and retard roller 23 is situated near the paper inlet 8 a .
- a pair of swingable arms 20 extend forwards (to the right in the drawing) from ends of the separate roller 22 such that they support a pick-up roller 21 at their free ends.
- a nip between the slave feed roller 24 and master feed roller 25 , a nip between the extra roller 26 and press roller 29 , a nip between the giant feed roller 28 and first slave roller 31 , a nip between the giant feed roller 28 and second slave roller 32 , a nip between the giant feed roller 28 and third slave roller 33 , and a nip between the extra roller 26 and press roller 29 are arranged in turn along the second ⁇ -shaped paper path R 2 ′ from the paper inlet 8 a to the paper exit 8 b.
- An upper half of the second paper path R 2 ′ is a means for turning the original sheet upside down prior to scanning.
- the extra roller 26 and press roller 29 is a means for reversing the transferring direction of the turned sheet to feed the sheet to the platen glass 12 .
- the extra roller 26 also serves as a means for reversing the transferring direction of the sheet after scanning at the platen glass 12 such that the sheet proceeds to the platen glass 12 again.
- the giant feed roller 28 and slave rollers 31 , 32 and 33 constitute in combination a means for guiding the original sheet to the platen glass 12 .
- the second guide member 38 is located at a second branching point downstream of the first branching point in the second paper path R 2 ′.
- the second guide member 38 pivots to a lower position C or an upper position D so as to regulate a moving direction of the sheet.
- the shaft 26 a of the extra roller 26 and shaft 28 a of the giant feed roller 28 incorporate the first and second angular sensors 46 and 48 respectively to detect rotation angles of the rollers.
- Step T 3 As the user presses the start button 19 on the operation panel 13 (Step T 3 ), the controller 40 issues control signals to the drive source 41 and power transmission mechanism 42 of the extra roller 30 and other rollers 22 , 25 , 26 and 28 . As a result, the extra roller 26 rotates in the reverse direction (counterclockwise in FIG. 15) (Step T 4 ), and the pick-up roller 21 , separate roller 22 and retard roller 23 in combination pick up the uppermost one of the sheets (first original sheet) from the paper stack. The first original sheet is then transferred to the paper path from the paper inlet 8 a , and further transported by the master feed roller 25 and slave feed roller 24 towards the second paper path R 2 ′ (Step T 5 ).
- the first original sheet is transferred to the space above the discharge tray 7 c from the paper exit 8 b by the extra roller 26 and press roller 29 .
- the first position sensor 35 detects passage of the rear end of the first original sheet (Step T 6 )
- a detection signal is issued to the controller 40 .
- the controller 40 then issues instruction signals to the second guide member 38 and extra roller 26 .
- the second guide member 38 is switched to the upper position D in order to prevent the sheet from moving backwards towards the paper inlet 8 a (Step T 8 ).
- the extra roller 26 is caused to rotate in the normal direction (clockwise in FIG. 15) (Step T 9 ), and the first original sheet is transferred in the opposite direction by the extra roller 26 and press roller 29 .
- the controller 40 causes the second angle sensor 48 to measure the rotation angle of the giant feed roller 28 (second rotation angle), which corresponds to the moving distance of the sheet front end from the position of the second position sensor 36 to the rear end of the platen glass 12 .
- second rotation angle the rotation angle of the giant feed roller 28
- the controller 40 causes the third guide member 39 to pivot to the upper position F (Step T 15 ) and the extra roller 26 to rotate in the reverse direction (counterclockwise in FIG. 15) (Step T 16 ). The controller 40 then lifts the press roller 29 so that the extra roller 26 contacts the press roller 29 again (Step T 17 ).
- Step T 20 when the fourth rotation angle is detected by the angle sensor 48 (Step T 20 ) and most of the first original sheet is discharged from the paper exit 8 b such that the rear end of the sheet is only nipped between the extra roller 26 and press roller 29 , then the third guide member 39 is caused to pivot to the lower position E (Step T 21 ), and the rotating direction of the extra roller 26 is switched to the normal direction (clockwise in FIG. 15) (Step T 22 ).
- the controller 40 causes the angle sensor 48 to measure the rotation angle of the giant feed roller 28 .
- the scanning of the front side of the first original sheet is initiated (Step T 26 ).
- the first original sheet is transported by the giant feed roller 28 and second slave roller 32 or third slave roller 33 .
- the second position sensor 36 detects passage of the rear end of the first original sheet (Step T 27 )
- the controller 40 issues command signals to the second guide member 38 , third guide member 39 , extra roller 26 and lift mechanism 43 of the press roller 29 respectively.
- the controller 40 also issues command signals to the scanner 6 and the power transmission mechanism 42 of the drive unit 41 .
- the third guide member 39 pivots to the upper position F (Step T 28 ) and the second guide member 38 pivots to the lower position C (Step T 29 ).
- the extra roller 26 rotates in the reverse direction (counterclockwise in FIG. 12) (Step T 30 ) and the press roller 29 ascends so that it contacts the extra roller 26 again (Step T 31 ).
- the controller 40 causes the angle sensor 48 to count the rotation angle of the giant feed roller 28 .
- the scanning operation applied to the front side of the first original sheet is finished (Step T 33 ).
- the pick-up roller 21 , separate roller 22 , retard roller 23 and other rollers cooperate to separate the next uppermost sheet (second original sheet) from the paper stack and feed it into the paper path from the paper inlet 8 a .
- the second original sheet is fed into the second paper path R 2 ′ by the master feed roller 25 and slave feed roller 24 (Step T 34 ).
- Step T 6 the program returns to Step T 6 in FIG. 17, and proceeds until Step T 33 to transport and scan the original sheet. Similar procedure will be taken for a next original sheet.
- Step T 37 If the first position sensor 35 does not detect passage of a sheet within a predetermined period, during which the angle sensor 48 counts the third rotation angle of the giant feed roller 28 at Step T 32 in FIG. 21 and a further angle larger than the fourth rotation angle (Step T 37 ), all the rollers are deactivated (Step T 38 ).
- ADF 8 is sufficiently elongated in the forward and backward directions (or the paper path is sufficiently elongated) such that a front end of a larger sheet such as A 3 size sheet does not overlap a rear end of another larger sheet at the nip between the rollers 26 and 29 when the sheet transportation direction is reversed, then the lift mechanism 43 is not needed to the press roller 29 .
- the number of parts can be reduced and a manufacturing cost is reduced. This can be said to both of the embodiments described above.
- the sheet is turned upside down at the initial stage of the transportation process prior to scanning, and transferred to the scanner 6 . Accordingly, the sheet passes over the platen glass 12 only twice. This reduces the total time needed to scan both sides of the sheet.
- the sheet placed at the feed tray 9 with its front side up is scanned from its back side first. Then, the sheet is turned upside down so that its front side is scanned. The sheet is then discharged onto the discharge tray with its front side down. The next sheet is discharged on the preceding sheet in the same manner.
- page 1 first sheet front side
- page 2 first sheet back side
- page 3 second sheet front side
- page 4 second sheet back side
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Facsimiles In General (AREA)
- Conveyance By Endless Belt Conveyors (AREA)
Abstract
An image scanning machine includes a document feeder for feeding sheets into a first paper path from a stack one sheet at a time if a one-side scanning mode is selected. If a both-side scanning mode is selected, a sheet is introduced into a second paper path which is an inverting path that turns a sheet, which is fed from the document feeder, upside down prior to scanning. Rollers located at a downstream end of the inverting path reverse a transportation direction of the sheet and feed the sheet to a scanner through a return path. The transportation direction of the sheet is reversed after the scanner scans one side of the sheet, and the sheet is then fed to the scanner again to scan the other side of the sheet. This transportation direction reversal results in turning the sheet upside down. A guide member is located a bifurcation of the return path and the inverting path for opening one of the return and inverting paths and closing the other of the return and inverting paths. Another guide member is located a bifurcation of the first and second paper paths.
Description
- This application claims priority under 35 USC 119 of Japanese Patent Application Nos. 2000-169170, 2000-357409 and 2000-212373 filed in JPO on Jun. 6, 2000, Nov. 24, 2000 and Jul. 13, 2000 respectively, the entire disclosures of which are incorporated herein by reference.
- 1. Field of the Invention
- The present invention relates to an image scanning apparatus that can read both front and back sides of each of sheets successively fed to a scanner part.
- 2. Description of the Related Art
- When a conventional image scanning apparatus scans both sides of an original document, its scanner part first scans a front side. The original document is then transferred in a paper path to a space above a discharged paper receiving tray (first paper path) by discharge rollers, and the discharge rollers that nip an end of the original document are caused to rotate in a reverse direction so that the document is moved backward and introduced into another paper path (second paper path) to turn the document upside down. After that, the document is sent to the scanner part again such that a back side of the document is scanned. Subsequent to this, the document is discharged into the discharge tray.
- After reversing the document feed direction in the conventional image scanning apparatus, the document is transferred into the second paper path, as mentioned above. For this reason, a guide member is generally disposed at a branching point between the first and second paper paths. The guide member is a switching member to determine which paper path should be used.
- The original document is discharged on the discharge tray with its front side being up. In other words, the first page is up and the second page down. Therefore, when two original sheets of paper are discharged on the tray, page 1 (front side of the first sheet) faces page 4 (back side of the second sheet).
- In order to overcome this problem, the original sheet is reintroduced into the paper path after both the two sides of the original sheet are scanned, so that the original sheet is turned upside down again. In this case, however, no scanning is performed. The original paper is then discharged onto the discharge tray.
- As a result,
page 1 is down,page 2 is up,page 3 is down (so that it contacts page 2), andpage 4 is up (in case of the two-sheet scanning). - In this conventional arrangement, however, the original document has to pass the scanning part three times, i.e., when its front side is scanned, back side is scanned and the document is turned upside down without scanning. Accordingly, the scanning operation takes a relatively long period as a whole.
- Further, when the original paper passes over the scan part for the third time, no scanning operation is conducted. During this action, therefore, the scanner part is occupied by the original paper without scanning operation, and it is not possible to feed the next original paper to the scan part. Accordingly, the scanning speed of the machine is lowered as a whole.
- Moreover, the guide member located at the branching point between the first and second paper paths is driven by an electrically controlled element such as a solenoid when it is switched to connect the first or second paper path to the paper discharge exit. It is required to synthesize rotating movements of paper feed roller(s) with the switching movement of the guide member. This makes the paper feed control complicated.
- An object of the present invention is to provide an image scanning apparatus that can eliminate the above-described problems.
- One concrete object of the present invention is to reduce the time needed to scan both sides of an original document.
- Another concrete object of the present invention is to drive a guide member disposed at a paper path branching point without employing a complicated control program.
- According to one aspect of the present invention, there is provided an image scanning apparatus comprising: a scanner; a document feeder for receiving sheets in a stack and feeding one sheet at a time; an inverting path for turning a sheet, which is fed from the document feeder, upside down before scanning; a transportation means located at a downstream end of the inverting path for reversing a transportation direction of the sheet and feeding the sheet to the scanner through a return path; a reversing means for reversing the transportation direction of the sheet after the scanner scans one side of the sheet, and feeding the sheet to the scanner again to scan the other side of the sheet; and a discharging means for discharging the sheet after the two sides of the sheet are scanned. The sheet is substantially turned upside down when its transportation direction is reversed and fed to the scanner for the second time.
- A guide member may be located a bifurcation of the return path and the inverting path for opening one of the return and inverting paths and closing the other of the return and inverting paths, whereby it is possible to introduce the sheet into the return path after the sheet is fed towards the scanner from the downstream end of the inverting path.
- The transportation means may include at least one roller, and the reversing means may include at least one roller. The guide member may pivot as the transportation means rotates. The guide member may be operatively connected to the transportation means via a torque limiter.
- Three rollers may be arranged to form two pairs of rollers, and one of the two pairs of rollers may constitute the transportation means whereas the other pair of rollers may constitute the reversing means. The latter pair of rollers may also constitute the discharging means.
- Alternatively, two rollers may only be arranged to constitute all of the transportation means, reversing means and discharging means.
- Additional objects, aspects, benefits and advantages of the present invention will become apparent to those skilled in the art to which the present invention pertains from the subsequent detailed description and the appended claims, taken in conjunction with the accompanying drawings.
- FIG. 1 illustrates a perspective view of a facsimile machine incorporating an image scanning device according to a first embodiment of the present invention;
- FIG. 2 illustrates a lateral cross sectional view of the facsimile machine shown in FIG. 1;
- FIG. 3 illustrates an enlarged lateral cross sectional view of ADF used in the facsimile machine shown in FIG. 1;
- FIG. 4 illustrates a lateral view of a second guide member and associated elements;
- FIG. 5 illustrates a plan view of the second guide member and associated elements shown in FIG. 4;
- FIG. 6 illustrates a lateral view of a gear train;
- FIG. 7 is a block diagram of the image scanning device;
- FIG. 8 is a flowchart showing an operation of the image scanning device according to the first embodiment;
- FIG. 9 is a flowchart particularly illustrating an initial stage of the operation of the image scanning device;
- FIG. 10 is a flowchart showing a second stage of the operation of the image scanning device;
- FIG. 11 illustrates a third stage of the operation;
- FIG. 12 illustrates a front half of a control loop according to the first embodiment;
- FIG. 13 illustrates a second half of the control loop;
- FIG. 14 illustrates a final stage of the operation;
- FIG. 15 illustrates a lateral cross sectional view of ADF according to a second embodiment of the present invention;
- FIG. 16 illustrates a flowchart of an operation performed by an image scanning device of the second embodiment;
- FIG. 17 is a flowchart illustrating a first stage of the operation;
- FIG. 18 illustrates a flowchart of a second stage of the operation;
- FIG. 19 illustrates a flowchart of a third stage of the operation;
- FIG. 20 illustrates a flowchart of a fourth stage of the operation; and
- FIG. 21 illustrates a flowchart of a final stage of the operation.
- Embodiments of the present invention will now be described in reference to the accompanying drawings. In the following description, a facsimile machine is employed as an image scanning apparatus of the present invention.
- Referring to FIGS. 1 and 2, illustrated is a facsimile machine that includes a
scanner part 1 and aprinter part 2 below the scanner part. Theprinter part 2 includes aprinter module 3 and apaper cassette 4 below the printer module. Sheets stacked in thepaper cassette 4 are transferred to theprinter module 3, and discharged onto adischarge tray 5 after printing. - The
scanner part 1 has acasing 10, and ahinge 10 b extending from a lower surface of thecasing 10 engages on ahinge pin 1 a of theprinter part 2. Thescanner part 1 can therefore pivot up and down relative to theprinter par 2 about thehinge pin 1 a. - The
scanner part 1 includes ascanner module 6 in thecasing 10. A transparent stationarydocument loading bed 11 lies over thecasing 10. An original document placed on thetransparent bed 11 is scanned by thescanner module 6 that moves from a start position indicated by the solid line to an end position indicated by a phantom line in FIG. 2. - A
document cover 7 lies over thebed 11 such that it can pivot up and down about one edge thereof. The original document situated on thetransparent bed 11 is pressed by thedocument cover 7 from the top. - An automatic document feeder (ADF)8 is attached near the edge of the
document cover 7. An outer contour or appearance of ADF 8 is defined by thedocument cover 7 and a pair of side frames 7 a and 7 b as shown in FIG. 1. Thedocument cover 7 andside frames ADF cover 14 that covers a main mechanism of ADF 8. The ADF cover 14 is openable. Metallic plates (not shown) stand inside the side frames 7 a and 7 b such that they support ends of feed rollers. Thecover 7 and one or both of the side frames 7 a and 7 b house in combination a drive source (e.g., motor) adapted to rotate drive rollers (e.g., paper feed rollers) and associated parts such as chains, sprockets, gears, etc. - ADF8 includes an outer frame constituted by the
cover 7 andside frames ADF cover 14. - An original
paper feed tray 9 is disposed above thedocument cover 7 such that it continues to apaper inlet 8 a of ADF 8. An originalpaper discharge tray 7 c lies below the originalpaper feed tray 9. Thistray 7 c defines an upper surface of thedocument cover 7 and is continuous to anoutlet opening 8 b of ADF 8, which opens below thepaper inlet 8 a. Thus, a paper path is formed inside ADF 8 such that it extends from thepaper inlet 8 a to theoutlet 8 b. - Referring to FIG. 3, original sheets piled on the
feed tray 9 are picked up by thefeed roller 21 and transmitted to thepaper inlet 8 a. When the sheets are transported to aseparate roller 22 and aretard roller 23, they are separated sheet by sheet and further transported along the paper path by theseparate roller 22,feed roller 25 andgiant feed roller 28 up to aplaten glass 12. The original sheet passing over theplaten glass 12 is scanned by thescanner 6 which is situated at the initial position as indicated by the solid line. The original sheet is then transmitted to thedischarge tray 7 c through thedischarge opening 8 b. - The
scanner part 1 can therefore be used as a flat bed scanner that scans a stationary original document with a movingscanner 6 and a sheet feed scanner that scans a moving original document with astationary scanner 6. - Referring to FIG. 1, the
scanner casing 10 has anoperation panel 13 with a number of keys and buttons. By pressing these keys, a user can instruct the machine to scan an original document and enter a facsimile (or telephone) number so as to transmit the scanned image to a remote machine via facsimile. The user is also able to instruct theprinter 3 to print the scanned image. Of course, the user can instruct the machine to perform other functions. - The inside structure of ADF8 will be described. In the following description in reference to FIG. 3, the “forward position” is a position of the
paper inlet 8 a or that of theoutlet 8 b (i.e., rightward position), and the “backward position” is a position of a 180-degree turning portion of the paper path (i.e., leftward position). The original paper moves from the forward position (8 a) toward the backward position and returns to the forward position (8 b). Directions perpendicular to the drawing sheet are right and left directions. It should be assumed that theADF cover 14 is closed and nothing is placed on thetransparent bed 11 with thedocument cover 7 put on the top of thescanner casing 10 as shown in FIG. 2 unless otherwise mentioned. - First, the paper path will be described. As shown in FIG. 3, a first “C” shaped paper path R1 extends from the
paper inlet 8 a to aroller 33 in ADF when viewed laterally, and a discharge path R3 extends from the roller 33(or platen glass 12) to thepaper outlet 8 b. Downstream of theseparate roller 22, provided arefeed rollers separate roller 22 andretard roller 23. Aroller 27 is a first press roller. - A
feed roller 28 is disposed at the end of the first paper path R1 and the beginning of the discharge path R3. Thefeed roller 28 is on theplaten glass 12. Anextra roller 26 and asecond press roller 29 are disposed at the end of the paper discharge path R3. Theserollers - A return path R4 extends from the end of a second paper path R2 towards the
feed roller 28 and connects to the first paper path R1. A conjunction path R5 extends from the end of the discharge path R3 and meets the return path R4. Thesecond press roller 29 is lifted up and down by a cam mechanism (not shown) so that it can contact and leave theextra roller 26. - The second paper path R2 serves as an inverting means for turning the document upside down prior to scanning when the document is fed from the
paper inlet 8 a. Theextra roller 26 andfirst press roller 27 is a transportation means for transporting the turned document in a reverse direction such that the document reaches theplaten glass 12. Thegiant feed roller 28 andslave rollers 31 to 33 constitute in combination a guide means for introducing the original document to theplaten glass 12. Theextra roller 26 andsecond press roller 29 serve as a reverse feeding means for reversing the transportation direction of the original document after one side of the original document is scanned on theplaten glass 12, such that the original document is transported to theplaten glass 12 again. - The
rollers rollers rollers - A
first guide member 37 is installed at a position downstream of the nip between theslave feed roller 24 andmaster feed roller 25, i.e., at a branching position of the first and second paper paths R1 and R2. Thefirst guide member 37 can pivot up and down about a pivot center (shaft) 37 a so that one of the paper paths R1 and R2 is blocked by thefirst guide member 37 and the paper can proceed in the other paper path. When a user pressescertain function keys 18 and/or other keys on the control panel 13 (FIG. 1) to bring the machine into a one-side scanning mode, thefirst guide member 37 pivots downwards to a lower position A, and the document is transmitted to the first paper path R1. On the other hand, when a user selects a both-side scanning mode, thefirst guide member 37 pivots to an upper position B, and the document is introduced to the second paper path R2. - On the
shaft 27 a of thefirst press roller 27, disposed is asecond guide member 38 that can pivot to a lower position C or an upper position D. The position C interrupts passage of the document, and the position D allows passage. - Between the
extra roller 26 andgiant feed roller 28, the third paper path R3 and return path R4 are connected to each other by a fifth paper path R5. Athird guide member 39 is provided below the fifth paper path R5. Thethird guide member 39 pivots up and down about ashaft 39 a so as to control passage of the document. Specifically, when thethird guide member 39 is moved to a lower position E, the third paper path R3 is closed, and the document is forced to move in the fifth paper path R5. When thethird guide member 39 is moved to an upper position F, on the other hand, the fifth paper path R5 is closed and the document moves in the third paper path R3. - The
third guide member 39 may be a flexible member such as film. It is also satisfactory that thethird guide member 39 is closed and opened by its deadweight. - A
first position sensor 35 is disposed on the second paper path R2 between the nip of theslave feed roller 24 andmaster feed roller 25 and the nip of theextra roller 26 andfirst press roller 27, and asecond position sensor 36 is disposed near a merge of the first paper path R1 and return path R4 so as to detect the paper passing thereover respectively. - A
first angle sensor 46 is incorporated in arotating shaft 26 a of theextra roller 26, and asecond angle sensor 48 is incorporated in arotating shaft 28 a of thegiant feed roller 28 so as to detect angular positions of the respective rollers. - A
controller 40 of the image scanning machine will now be described. - Passage of the document is controlled by the
controller 40 shown in FIG. 7. Thecontroller 40 is connected to sensors and other elements as described below. - Each of the
sensors controller 40. - Each of the
sensors controller 40 - The
guide rollers controller 40 and are caused to move to the upper or lower positions respectively so as to change the moving direction of the document. - The
drive source 41 and associatedpower transmission mechanism 42 for therollers controller 40. In particular, theextra roller 26 can be rotated in both directions. - A lift mechanism of the
second press roller 29, which includes a cam mechanism and other elements, can move up and down in accordance with control signals from thecontroller 40. - The
control panel 13 shown in FIG. 1 includes thefunction keys 18 for selecting a scanning mode such as the one-side or both-side scanning mode, astart button 19 for starting the scanning operation, astop button 16 for discontinuing the scanning operation while a plurality of sheets are being scanned, and other keys. As a user presses these keys, a control signal is sent to thecontroller 40. - Referring now to FIGS. 8 and 9, will be described a document turning mechanism.
- As shown in FIG. 9, a user first loads an original document into the
paper tray 9, with the front side of the document being up. The user then operates thefunction keys 18 to select the both-side scanning mode (Step S1). Thecontroller 40 produces and sends a control signal to theguide members guide members - When the use presses the
start button 19 on the control panel 13 (Step S3), thecontroller 40 issues a control signal to thedrive 41 andtransmission mechanism 42 of the extra roller 30 andother rollers extra roller 26 is then caused to rotate in a normal direction (clockwise in FIG. 3) (Step S4), and the pick-uproller 21,separate roller 22 andretard roller 23 cause the uppermost sheet (first original document) to separate from the paper stack and proceed into the paper path through thepaper inlet 8 a. This original document is further transported by themaster feed roller 25 and slave feedroller 24 into the second paper path R2 (Step S5). - When the first original document reaches the
paper exit 8 c, it is moved to a space above thedischarge tray 7 c by theextra roller 26 andfirst press roller 27. As thefirst position sensor 35 detects passage of the end of the first original document (Step S6), it issues a detection signal to thecontroller 40. Then, thecontroller 40 outputs a control signal to theextra roller 26 such that theextra roller 26 rotates in a reverse direction. - When the
first position sensor 35 detects the complete passage of the first original sheet, thecontroller 40 further controls the rotation (first rotation angle) of theextra roller 26 such that the end of the first original sheet is moved from the position of thefirst position sensor 35 to a position between thesecond guide member 38 and the nip of theextra roller 26 andfirst press roller 27. As shown in FIG. 10, specifically, after the firstangular sensor 46 detects the first rotation angle (Step S7) and most of the first original sheet is discharged from thepaper exit 8 c, theextra roller 26 is rotated in the reverse direction (counterclockwise in FIG. 3) (Step S8). In this situation, the end of the first original sheet is only nipped with theextra roller 26 andfirst press roller 27. Simultaneously, thesecond guide member 38 is switched to the lower position C such that the original sheet can be introduced to the return path R4 (Step S9). The original sheet is transported in the opposite direction by theextra roller 26 andfirst press roller 27. - The first original sheet that moves backwards is caught by the
giant feed roller 28 andfirst press roller 31. When the “front” end (this end is the “rear” end previously) of the first original sheet is detected by the second sensor 36 (Step S10), a detection signal is sent to thecontroller 40. Thecontroller 40 then instructs thescanner 6 to start the scanning operation. - As the
second position sensor 36 detects passage of the front end of the first original sheet, thecontroller 40 uses the secondangular sensor 48 to calculate a rotation angle (second rotation angle) of thegiant feed roller 28 corresponding to the moving distance of the front end of the sheet from the position of thesecond sensor 36 to the rear end of theplaten glass 12. When this second rotation angle is reached (Step S11), the scanning of the back side of the first original sheet is started (Step S12). - As illustrated in FIG. 11, the first original sheet is moved by the
giant feed roller 28 andsecond slave roller 32 orthird slave roller 33. When passage of the rear end of the first original sheet is detected by the second positional sensor 36 (Step S13), the detection signal is sent to thecontroller 40. Thecontroller 40 then issues a control signal to thescanner 6 to terminate the scanning. After that, thecontroller 40 issues control signals to theextra roller 26,third guide roller 39 and thepower transmission mechanism 42 of thedrive source 41 respectively. - As the
second position sensor 36 detects the complete passage of the first original sheet, thecontroller 40 uses theangular sensor 48 to measure a rotation angle (third rotation angle; greater than the second rotation angle) of thegiant feed roller 28 corresponding to the moving distance of the sheet rear end from the second position sensor's position to the front end of theplaten glass 12, and a rotation angle (fourth rotation angle) of thegiant feed roller 28 corresponding to the moving distance of the sheet rear end from the second position sensor's position to a mid point between thethird guide member 39 and the nip of theextra roller 26 andsecond press roller 29. When the third rotation angle is reached (Step S14), the scanning of the back side of the first original sheet is finished (Step S15). - When the fourth rotation angle is detected by the angular sensor38 (Step S16), most of the first original sheet is discharged from the
exit 8 b and the rear end of the sheet is only nipped between theextra roller 26 and thesecond press roller 29. At this point, theextra roller 26 is caused to stop rotating (Step S17). Further, thethird guide member 39 is switched to the lower position E in order not to allow the sheet to move reversally toward the third slave roller 33 (Step S18). - In this situation, the pick-up
roller 21,separate roller 2 and retardroller 23 pick up a currently uppermost sheet (second original sheet) from the paper stack and feed it into the paper path from theinlet 8 a (Step S19). Theextra roller 26 starts rotating in the normal direction (clockwise in FIG. 3) (Step S20). This sheet is further transported by themaster feed roller 25 and slave feedroller 24 so that the sheet reaches the second paper path R2. Here, the front end of the second original sheet is detected by the first position sensor 35 (Step S21), and the sheet is further transported by theextra roller 26 andfirst press roller 27 such that it is discharged from theexit 8 c into the space above thedischarge tray 7 c. - As the
extra roller 26 rotates in the normal direction at Step S20, the first original sheet is also transported backwards; it moves in the fourth paper path R4 and caught by thegiant feed roller 28 andfirst slave roller 31. When the front end of the first original sheet (this end is the rear end before the second backward movement, i.e., the front end at the time of loading into thepaper inlet 8 a is again the front end) is detected by the second position sensor 36 (Step S22), the detection signal is sent to thecontroller 40. Thecontroller 40 then instructs thelift mechanism 43 of thesecond press roller 29 to move down and thescanner 6 to scan the sheet. Thecontroller 40 then immediately instructs thethird guide member 39 to move to the opposite position. - In this manner, the
second press roller 29 is moved down so that it is separated from the extra roller 26 (Step S23). If the length of the sheet is greater than the total lengths of the paper paths R5, R4 and R3, the front end of the sheet reaches or returns to therollers rollers rollers rollers rollers rollers - The
controller 40 causes theangular sensor 48 to count the rotation angle of thegiant feed roller 28 upon detecting the front end of the first original sheet by thesecond position sensor 36. When the second rotation angle is reached (Step S24), the scanning of the front side of the first original sheet begins (Step S25). Thecontroller 40 soon issues a control signal to thethird guide member 39 such that the third guide member moves to the upper position F (Step S26). - After that, the first original document is transported by the
giant feed roller 28 andsecond slave roller 32 orthird slave roller 33. When thesecond position sensor 36 detects passage of the rear end of the first original document (Step S27), thecontroller 40 causes theangular sensor 48 to measure the rotation angle of thegiant feed roller 28. When the third rotation angle is reached (Step S28), a control signal is issued to thescanning unit 6 to stop the scanning so that the scanning of the front side of the first original document is complete (Step S29). - While the first original document is being scanned, the second original document is transported in the second paper path R2 toward the
exit 8 c. As shown in FIG. 13, when passage of the rear end of the second original document is detected by the first position sensor 35 (Step S30), a detection signal to sent to thecontroller 40. Thecontroller 40 then issues a control signal to theextra roller 26 and thelift mechanism 43 of thesecond press roller 32. - Upon receiving the detection signal indicative of the passage of the rear end of the first original document from the
first position sensor 35, thecontroller 40 causes the firstangular sensor 46 to measure the rotation angle of theextra roller 36. When the measured rotation angle reaches the first rotation angle (Step S31), most of the second original document is discharged from thepaper exit 8 c and the rear end of the second original document is only nipped between theextra roller 26 andfirst press roller 27. In this situation, theextra roller 26 is caused to rotate in the reverse direction (counterclockwise in FIG. 3) (Step S32), and at the same time thesecond guide member 38 is switched to the lower position C in order to feed the second original document in the return path R4 (Step S33). The second original document is moved backwards by theextra roller 26 andfirst press roller 27, and thesecond pres roller 32 is moved up to contact the extra roller 26 (Step S34). - The program returns to Step S10 to perform the scanning operation to the second original document. The scanning operation itself is the same as that applied to the first original document.
- The first original document is further transported towards the
discharge tray 7 c by theextra roller 26 andsecond press roller 29 since theextra roller 26 starts rotating in the reverse direction at Step S32. - In this manner, as the front side of the preceding document is scanned completely, the scanning to the back side of the current original document is immediately initiated. Thus, a plurality of documents are successively scanned. It should be noted, however, that the flowchart for transportation of the last original document is different.
- Specifically, when the program arrives at Step S21 in FIG. 11 for the last original sheet, the
first position sensor 35 does not function since there is no next sheet. Thus, the program ends when the front side of the last original sheet is completely scanned. If the first original sheet is the last original sheet, the program executes the below described process after executing Steps S1 through S21. - A flowchart for the last original sheet will be described. For example, if the
first position sensor 35 does not detect passage of the original sheet within a predetermined period (Step S21), i.e., while thecontroller 40 measures the fourth rotation angle of thegiant feed roller 28 with theangular sensor 48 at Step S16 in FIG. 11, and further measures a predetermined angle, then the last original sheet moved backward at Step S20 proceeds in the fifth paper path R5 and is transported by thegiant feed roller 28 andfirst slave roller 31. When the front end of the last original sheet is detected by the sensor position sensor 6 (Step S35), a detection signal is output to thecontroller 40 as shown in FIG. 14. Thecontroller 40 instructs the second pressroller lift mechanism 43 to move downward and thescanner 6 to start scanning. Immediately thereafter, thecontroller 40 instructs thethird guide member 39 to switch to the other position. - The
second press roller 29 is lowered so that theextra roller 26 is separated from the second press roller 29 (Step S36). - The
controller 40 measures the rotation angle of thegiant feed roller 28 using theangular sensor 48 as thesecond position sensor 36 detects the front end of the last original sheet. When the second rotation angle is reached (Step S37), the scanning of the front side of the last original sheet is started (Step S38). Thecontroller 40 immediately issues a control signal (switching signal) to thethird guide member 39 such that thethird guide member 39 moves to the upper position F (Step S39). - The last original sheet is transferred by the
giant feed roller 28 andsecond slave roller 32 orthird slave roller 33. When thesecond position sensor 36 detects passage of the rear end of the last original sheet (Step S40), a detection signal is sent to thecontroller 40. Thecontroller 40 then issues control signals to theextra roller 36 and second press roller lift mechanism 43 (lifting command) and issues a control command to the scanner 6 (scanning termination command). - The extra roller is caused to rotate in the reverse direction (counterclockwise in FIG. 3) (Step S41) and the
second press roller 29 is moved upward such that it contacts theextra roller 26 again (Step S42). When thesecond position sensor 36 detects passage of the rear end of the first original sheet, thecontroller 40 measures the rotation angle of thegiant feed roller 28 using theangular sensor 48. When the third rotation angle is reached (Step S43), the scanning to the last original sheet is completed (Step S44). - The last original sheet is then moved to the
discharge tray 7 c by theextra roller 26 andsecond press roller 29. - Finally, the
controller 40 stops all the rollers after a predetermined period (Step S45). Specifically, thecontroller 40 deactivates the rollers after it measures the fourth rotation angle of thegiant feed roller 28 with theangular sensor 48 and further measures a predetermined rotation. - Because the sheet is turned upside down at the initial stage of the sheet transportation process prior to the scanning, and then fed to the
scanner 2, the sheet is required to pass over theplaten glass 12 only twice. As a result, the total scanning period needed to scan both sides of the sheet is reduced. Further, the sheet placed on thefeed tray 9 with its front side up, but its back side is first scanned. Then, the sheet is turned upside down and its front side undergoes the scanning. The sheet is discharged onto the discharge tray with its front side down. A next sheet is stacked on the first sheet. Thus, the sheets are piled up on the discharge tray in the decent order, i.e.,page 2 of the firstsheet contacts page 3 of the second sheet. - The sheet fed from the
feed tray 9 is turned upside down when it proceeds in the second paper path R2. The sheet is then transported backwards by theextra roller 26 andsecond press roller 29 and proceeds in the return path R4 such that it advances to the platen glass 12 (i.e., scanner). The sheet is further nipped by thegiant feed roller 28 andslave rollers platen glass 12. Therefore, the sheet does not approach theplaten glass 12 from the upper diagonal direction. This prevents degraded scanning and jamming. - If the original sheet is long, the front and rear ends of the original document after the first side scanning are transported by the
extra roller 26 and second press roller 29 (both of them are the reversing means) and theextra roller 21 and first press roller 27 (both of them are the transportation means). After the second side scanning, on the other hand, the front and rear ends of the original sheet are transported by theextra roller 26 and second press roller 29 (both of them are the reversing means). Further, the transportation directions are opposite each other. In the illustrated embodiment, therefore, theextra roller 26 and first press roller 27 (transportation means) are made always contact each other whereas theextra roller 26 and second press roller 29 (reversing means) can contact and leave each other. - In this manner, the
extra roller 26 is separated from thesecond press roller 29, and the front and rear ends of the original sheet after the second side scanning are transported byother rollers rollers - In order to cause the
extra roller 26 andsecond press roller 29 to contact and leave each other, however, thelift mechanism 43 including the motors and cams or an electromagnetic lift mechanism including solenoids should be employed. This would raise the manufacturing cost. - In this embodiment, therefore, the
lift mechanism 43 or the electromagnetic elevator is used to the minimum. Specifically, theextra roller 26 andsecond press roller 29 which constitute the reversing means are only made contact and separate. This contributes to the cost reduction. - The
second guide member 38 located at the bifurcation of the second paper path R2 and return path R4 for switching the moving direction of the sheet will be described. - Referring to FIGS.4 to 6, the
first press roller 27 in press contact with the rotatingextra roller 26 rotates about theshaft 27 a. Thesecond guide member 38 is also pivotable about theroller shaft 27 a. By this pivot movement, thesecond guide member 38 can move between the positions “c” and “d”. - The
first press roller 27 androller shaft 27 a rotate together, and theroller shaft 27 a andsecond guide member 38 are operatively connected to each other by agear assembly 51 and atorque limiter 61. - The
gear assembly 51 includes afirst gear 52 rotating with theroller shaft 27 a, asecond gear 53 engaging with thefirst gear 52 and athird gear 54 engaging with thesecond gear 53. The rotation center of thethird gear 54 coincides with theroller shaft 27 a. The third gear is an internal gear. - Ends of the
roller shaft 27 a are rotatably supported by theframe 8 d of ADF 8, and ashaft 53 a of thesecond gear 53 is also rotatably supported by theframe 8 d. - In the
gear train 51, the rotations of theroller shaft 27 a, e.g., leftward rotations of thefirst gear 52, cause thesecond gear 53 in mesh with thefirst gear 52 to rotate rightwards, and thethird gear 54 in mesh with thesecond gear 53 to rotate rightwards. That is, thefirst gear 52 andthird gear 54 rotate in the opposite directions. - The
torque limiter 61 includes acasing 62 rotatably supported by theroller shaft 27 a, a biasingmember 63 rotatably fitted on theroller shaft 27 a inside thecasing 62, acompression spring 64 located between thecasing 62 and biasingmember 63 for biasing the biasingmember 63 to thesecond guide member 38, and afriction member 65 located between the biasingmember 63 andsecond guide member 38. - The
friction member 65 is forced against the lateral face of thesecond guide member 38 by thecompression spring 64 and biasingmember 63. Thecasing 62 of thetorque limiter 61 is operatively connected to thethird gear 54 of thegear train 51 such that they can rotate together. - The
gear mechanism 51 andtorque limiter 61 have the above described structures. When, for example, theextra roller 26 rotates in the direction p1 and thefirst press roller 27 trails and rotates in the direction q1, then thefirst gear 52 rotating with theroller shaft 27 a rotates in the direction q1, and thethird gear 54 rotating opposite thefirst gear 52 rotates in the direction q2 together with thecasing 62 of thetorque limiter 61. When thetorque limiter casing 62 rotates in the direction q2, the biasingmember 63 biased to thesecond guide member 38 by thecompression spring 64 also rotates in the direction q2. - Between the biasing
member 63 andsecond guide member 38, exerted is a constant friction force by thefriction member 65. This friction force causes thesecond guide member 38 to rotate in the direction q2 (i.e., upwards) as the biasingmember 63 rotates in the direction q2. - When the
second guide member 38 pivots upwards and reaches the position “d”, it hits anupper stop pin 38 b (FIG. 4) located above and cannot move further upwards. - A force exerted by the
upper stop pin 38 b that prohibits thesecond guide member 38 from pivoting further upward is greater than an upward pivoting force applied to thesecond guide member 38 by the friction force from thefriction member 65. Thus, thesecond guide member 38 stops pivoting at the position “d”, and the biasingmember 63 keeps rotating in the direction q2 together with thecasing 62. - Specifically, as the
extra roller 26 is caused to rotate in the direction p1 and thefirst press roller 27 is caused to rotate in the direction q1, thetorque limiter 61 forces thesecond guide member 38 to pivot upwards from the position “c” to the position “d”. - If the
extra roller 26 rotates in the direction p2 and thefirst press roller 27 trails it and rotates in the direction q2, on the other hand, thethird gear 54 of thegear train 51 rotates in the direction q1 together with thetorque limiter casing 62, and thesecond guide member 38 pivots from the position “d” to the position “c” with the friction force of thefriction member 65. Thesecond guide member 38 abuts on thelower stop pin 38 a provided below thesecond guide member 38 when it reaches the position “c”. - As described above, the
second guide member 38 pivots upwards from >the position “c” to the position “d” as theextra roller 26 pivots in the direction p1, and pivots downwards from the position “d” to the position “c” as theextra roller 26 pivots in the direction p2. In this manner, the changing rotating direction of theextra roller 26 switches the pivoting direction of thesecond guide member 38 and closes/opens the second paper path R2. - Thus, the
second guide member 38 pivots up and down depending upon the rotating direction of theextra roller 26, which serves as the roller for reversing the feeding direction of the original sheet, so as to open and close the second paper path R2. Consequently, the paper proceeds in the second paper path R2 or return path R4. The original sheet moving backward in the second paper path R2 eventually reaches the end of the second paper path, and then introduced to thescanner 6 through the return path R4. In order to cause the original sheet to proceed in the return path R4, changing the rotation direction of theextra roller 26 is only required. This simplifies the paper path switching operation. - Since the
second guide member 38 andextra roller 26 are operatively connected to each other via thefirst press roller 27,gear train 51 andtorque limiter 61, and the change of the pivoting direction of thesecond guide member 38 in accordance with the rotating direction of theextra roller 26 is realized by the mechanical structures such as thegear train 51 and/ortorque limiter 61, it is not necessary to drive thesecond guide member 38 in synchronization with theextra roller 26 or other elements. In other words, electrical and electronic controls are not needed for the synchronous operation. Accordingly, a program control applied to thepaper feed apparatus 12 can be simplified. - Therefore, the original sheet transported in the second paper path R2 can easily be transferred to the
scanner 6. - The structure of ADF8 according to a second embodiment of the present invention will now be described. It should be noted that similar reference numerals are used to designate similar elements in the first and second embodiments.
- Referring to FIG. 15, first will be described the transportation of the sheets. ADF8 has a first paper path R1 which extends from the
paper inlet 8 a to thepaper outlet 8 b and is generally shaped “C” as viewed laterally, and a second paper path R2′ which is generally shaped “ε” between thepaper inlet 8 a andoutlet 8 b. Theextra roller 26 is disposed near thepaper exit 8 b, and thepress roller 29 is disposed below theextra roller 26. The nip between theseparate roller 22 andretard roller 23 is situated near thepaper inlet 8 a. A pair ofswingable arms 20 extend forwards (to the right in the drawing) from ends of theseparate roller 22 such that they support a pick-uproller 21 at their free ends. A nip between theslave feed roller 24 andmaster feed roller 25, a nip between theextra roller 26 andpress roller 29, a nip between thegiant feed roller 28 andfirst slave roller 31, a nip between thegiant feed roller 28 andsecond slave roller 32, a nip between thegiant feed roller 28 andthird slave roller 33, and a nip between theextra roller 26 andpress roller 29 are arranged in turn along the second ε-shaped paper path R2′ from thepaper inlet 8 a to thepaper exit 8 b. - The pick-up
roller 21,separate roller 22,retard roller 23 and other elements function in combination to separate original sheets stacked on thepaper feed tray 9 one sheet at a time and feed it to the paper path from thepaper inlet 8 a. - An upper half of the second paper path R2′ is a means for turning the original sheet upside down prior to scanning. The
extra roller 26 andpress roller 29 is a means for reversing the transferring direction of the turned sheet to feed the sheet to theplaten glass 12. Theextra roller 26 also serves as a means for reversing the transferring direction of the sheet after scanning at theplaten glass 12 such that the sheet proceeds to theplaten glass 12 again. Thegiant feed roller 28 andslave rollers platen glass 12. -
Shafts master feed roller 25,extra roller 26 andgiant feed roller 28 are fixedly supported by the lateral plates of the ADF main housing at their ends respectively, and therollers rollers rollers - The
first guide member 37 is disposed slightly downstream of the nip of theslave feed roller 24 andmaster feed roller 25. Specifically, thefirst guide member 37 is located at a first bifurcation of the first paper path R1 and second paper path R2′. Thefirst guide member 37 can pivot up and down about theshaft 37 a so that selection of the paper path can be made. Specifically, when a user operates thefunction keys 18 on thecontrol panel 13 to decide which side of the sheet should be scanned, and selects the one-side scanning mode, thefirst guide member 37 pivots to a lower position A so that the sheet is transported into the first paper path R1. If the user selects the both-side scanning mode, the first guide member pivots to an upper position B so that the sheet proceeds to the second paper path R2′. - The
second guide member 38 is located at a second branching point downstream of the first branching point in the second paper path R2′. Thesecond guide member 38 pivots to a lower position C or an upper position D so as to regulate a moving direction of the sheet. - The
third guide member 39 is located at a third branching point downstream of the second branching point (closer to thepaper exit 8 b) in the second paper path R2′. Thethird guide member 39 pivots to a lower position E or an upper position F so as to regulate a moving direction of the sheet. - The
first position sensor 35 is provided at an appropriate position in the second paper path R2′ between the nip of theslave feed roller 24 andmaster feed roller 25 and the nip of theextra roller 26 andpress roller 29 to detect passage of the sheet. Thesecond position sensor 36 is provided near the confluence of the first paper path R1 and second paper path R2′ to detect passage of the sheet. - The
shaft 26 a of theextra roller 26 andshaft 28 a of thegiant feed roller 28 incorporate the first and secondangular sensors - The
controller 40 of this embodiment is similar to thecontroller 40 of the first embodiment. As illustrated in FIG. 7, thecontroller 40 of the second embodiment is also connected to various sensors, members and other elements. - The mechanism for turning the sheet upside down in this embodiment will be described in detail in reference to FIGS.16 to 21.
- Referring to FIG. 17, a user first loads an original sheet on the
feed tray 9 with the front side of the sheet being up. Then, the user operates thefunction keys 18 on theoperation panel 13 to select the both-side scanning mode (Step T1). Thecontroller 40 issues control signals to theguide members first guide member 37 is caused to pivot to the upper position B, thesecond guide member 38 to the lower position C and thethird guide member 39 to the lower position E (Step T2). - As the user presses the
start button 19 on the operation panel 13 (Step T3), thecontroller 40 issues control signals to thedrive source 41 andpower transmission mechanism 42 of the extra roller 30 andother rollers extra roller 26 rotates in the reverse direction (counterclockwise in FIG. 15) (Step T4), and the pick-uproller 21,separate roller 22 andretard roller 23 in combination pick up the uppermost one of the sheets (first original sheet) from the paper stack. The first original sheet is then transferred to the paper path from thepaper inlet 8 a, and further transported by themaster feed roller 25 and slave feedroller 24 towards the second paper path R2′ (Step T5). - The first original sheet is transferred to the space above the
discharge tray 7 c from thepaper exit 8 b by theextra roller 26 andpress roller 29. When thefirst position sensor 35 detects passage of the rear end of the first original sheet (Step T6), a detection signal is issued to thecontroller 40. Thecontroller 40 then issues instruction signals to thesecond guide member 38 andextra roller 26. - When the
first position sensor 35 detects passage of the rear end of the first original sheet, thecontroller 40 controls the rotation angle of the extra roller 26 (first rotation angle) such that the rear end of the sheet is further transported from the position of thefirst position sensor 35 to a mid point between thethird guide member 39 and the nip of theextra roller 26 andpress roller 29. Specifically, as illustrated in FIG. 18, when the firstangular sensor 46 detects the first rotation angle (Step T7), most of the sheet is discharged from thepaper exit 8 b and the rear end of the sheet is only nipped between theextra roller 26 andpress roller 29. At this point, thesecond guide member 38 is switched to the upper position D in order to prevent the sheet from moving backwards towards thepaper inlet 8 a (Step T8). Simultaneously, theextra roller 26 is caused to rotate in the normal direction (clockwise in FIG. 15) (Step T9), and the first original sheet is transferred in the opposite direction by theextra roller 26 andpress roller 29. - The first original sheet moving backwards is caught by the
giant feed roller 28 andfirst slave roller 31. When the front end of the first original sheet is detected by the second position sensor 36 (Step T10), a detection signal is sent to thecontroller 40. Thecontroller 40 produces control signals to thelift mechanism 43 of thepress roller 29 and thescanner 6. - The
press roller 29 is lowered to be spaced from the extra roller 26 (Step T11). Therefore, the sheet front and rear ends can smoothly move in opposite directions in a gap between therollers - When the
second position sensor 36 detects passage of the front end of the first original sheet, thecontroller 40 causes thesecond angle sensor 48 to measure the rotation angle of the giant feed roller 28 (second rotation angle), which corresponds to the moving distance of the sheet front end from the position of thesecond position sensor 36 to the rear end of theplaten glass 12. When the second rotation angle is reached (Step T12), the scanning of the back side of the first original sheet is started (Step T13). - Referring to FIG. 19, the first original sheet is transported by the
giant feed roller 28 andsecond slave roller 32 orthird slave roller 33. When passage of the rear end of the first original sheet is detected by the sensor position sensor 36 (Step T14), a detection signal is output to thecontroller 40. Thecontroller 40 sends instruction signals to thelift mechanism 43 of thepress roller 29,third guide roller 39,extra roller 26 andscanner 6 respectively. - When the
second position sensor 36 detects passage of the rear end of the first original sheet, thecontroller 40 causes thethird guide member 39 to pivot to the upper position F (Step T15) and theextra roller 26 to rotate in the reverse direction (counterclockwise in FIG. 15) (Step T16). Thecontroller 40 then lifts thepress roller 29 so that theextra roller 26 contacts thepress roller 29 again (Step T17). From this point of time, theangle sensor 48 measures the rotation angle of the giant feed roller 28 (third rotation angle, greater than the second rotation angle) which corresponds to the transportation distance of the sheet rear end from the position of thesecond position sensor 36 to the front end of theplaten glass 12, and the rotation angle of the giant feed roller 28 (fourth rotation angle) which corresponds to the transportation distance of the sheet rear end from the position of thesecond position sensor 36 to a mid position between thethird guide member 39 and the nip of theextra roller 26 andpress roller 29. When the third rotation angle is arrived at (Step T18), the scanning of the back side of the first original sheet is completed (Step T19). - Further, when the fourth rotation angle is detected by the angle sensor48 (Step T20) and most of the first original sheet is discharged from the
paper exit 8 b such that the rear end of the sheet is only nipped between theextra roller 26 andpress roller 29, then thethird guide member 39 is caused to pivot to the lower position E (Step T21), and the rotating direction of theextra roller 26 is switched to the normal direction (clockwise in FIG. 15) (Step T22). - In this manner, the first original sheet is transferred and caught by the
giant feed roller 28 andfirst slave roller 31. As shown in FIG. 20, the front end of the first original sheet (this “front end” is the front end of the sheet when loaded at thepaper inlet 8 a) is eventually detected by the second position sensor 36 (Step T23). A detection signal is issued to thecontroller 40. Thecontroller 40 issues command signals to thelift mechanism 43 of thepress roller 29 and thescanner 6. - As a result, the
press roller 29 descends so that it is separated from the press roller 29 (Step T24). - When the
second position sensor 36 detects the front end of the first original sheet, thecontroller 40 causes theangle sensor 48 to measure the rotation angle of thegiant feed roller 28. When the second rotation angle is arrived at (Step T25), the scanning of the front side of the first original sheet is initiated (Step T26). - Subsequently, the first original sheet is transported by the
giant feed roller 28 andsecond slave roller 32 orthird slave roller 33. When thesecond position sensor 36 detects passage of the rear end of the first original sheet (Step T27), such a fact is informed to thecontroller 40. Thecontroller 40 issues command signals to thesecond guide member 38,third guide member 39,extra roller 26 andlift mechanism 43 of thepress roller 29 respectively. After that, thecontroller 40 also issues command signals to thescanner 6 and thepower transmission mechanism 42 of thedrive unit 41. - The
third guide member 39 pivots to the upper position F (Step T28) and thesecond guide member 38 pivots to the lower position C (Step T29). Theextra roller 26 rotates in the reverse direction (counterclockwise in FIG. 12) (Step T30) and thepress roller 29 ascends so that it contacts theextra roller 26 again (Step T31). - As illustrated in FIG. 21, when the
second position sensor 36 detects passage of the rear end of the first original sheet, thecontroller 40 causes theangle sensor 48 to count the rotation angle of thegiant feed roller 28. When the third rotation angle is reached (Step T32), the scanning operation applied to the front side of the first original sheet is finished (Step T33). - The pick-up
roller 21,separate roller 22,retard roller 23 and other rollers cooperate to separate the next uppermost sheet (second original sheet) from the paper stack and feed it into the paper path from thepaper inlet 8 a. The second original sheet is fed into the second paper path R2′ by themaster feed roller 25 and slave feed roller 24 (Step T34). - After the scanning of the front and back sides of the first original sheet, the second original sheet is transported to the
paper exit 8 b. When thefirst position sensor 35 detects passage of the front end of the second original sheet (Step T35), a detection signal is issued to thecontroller 40. Thecontroller 40 then issues a switching signal to thethird guide member 39 such that thethird guide member 39 pivots to the lower position E (Step T36). Of course, the first original sheet is already discharged from thepaper exit 8 b by theextra roller 26 andpress roller 29. - Regarding the subsequent treatment made to the second original sheet, the program returns to Step T6 in FIG. 17, and proceeds until Step T33 to transport and scan the original sheet. Similar procedure will be taken for a next original sheet.
- When the last original sheet is processed, there is no next sheet so that the
first position sensor 35 does not operate after Step T33 in FIG. 21. After a predetermined period, the program is terminated. - If the
first position sensor 35 does not detect passage of a sheet within a predetermined period, during which theangle sensor 48 counts the third rotation angle of thegiant feed roller 28 at Step T32 in FIG. 21 and a further angle larger than the fourth rotation angle (Step T37), all the rollers are deactivated (Step T38). - At this point of time, the last sheet is of course already discharged from the
paper exit 8 b by theextra roller 26 andpress roller 29. - In this manner, the scanning to the first to last sheets is complete.
- If ADF8 is sufficiently elongated in the forward and backward directions (or the paper path is sufficiently elongated) such that a front end of a larger sheet such as A3 size sheet does not overlap a rear end of another larger sheet at the nip between the
rollers lift mechanism 43 is not needed to thepress roller 29. Thus, the number of parts can be reduced and a manufacturing cost is reduced. This can be said to both of the embodiments described above. - In this configuration, Steps S23 and S36 are dispensed with in the first embodiment, and Steps T11, T17, T24 and T31 are dispensed with in the second embodiment.
- Although the transportation distance of the sheet is measured by the
angle sensors drive power source 41. If a series of pulses are applied to multiple phase windings of a fixed stator of the stepper motor, a rotator rotates a predetermined angle upon each of the pulses; the stepper motor rotates stepwise upon pulses. Thecontroller 40 counts the stepwise rotations of the stepper motor and determines the moving distance of the sheet. - In the above described embodiments, the sheet is turned upside down at the initial stage of the transportation process prior to scanning, and transferred to the
scanner 6. Accordingly, the sheet passes over theplaten glass 12 only twice. This reduces the total time needed to scan both sides of the sheet. In addition, the sheet placed at thefeed tray 9 with its front side up is scanned from its back side first. Then, the sheet is turned upside down so that its front side is scanned. The sheet is then discharged onto the discharge tray with its front side down. The next sheet is discharged on the preceding sheet in the same manner. Thus, page 1 (first sheet front side) is directed down, page 2 (first sheet back side) is directed up, page 3 (second sheet front side) is directed down andcontacts page 2, and page 4 (second sheet back side) is directed up. - Since the sheet fed from the
feed tray 9 is turned upside down while it is moving in the second paper path R2′, transported backwards by theextra roller 26 andpress roller 29, and guided by thegiant feed roller 28 andslave rollers platen glass 12 from the upper diagonal direction. This prevents slant movement of the sheet so that the scanning degradation and jamming are avoided.
Claims (10)
1. An image scanning apparatus comprising:
a scanner;
a document feeder for receiving sheets in a stack and feeding one sheet at a time, each sheet having two sides;
an inverting path for turning a sheet, which is fed from the document feeder, upside down before scanning;
a transportation means located at a downstream end of the inverting path for reversing a transportation direction of the sheet and feeding the sheet to the scanner so as to scan one side of the sheet; and
a reversing means for reversing the transportation direction of the sheet after the scanner scans the one side of the sheet, and feeding the sheet to the scanner again to scan the other side of the sheet.
2. The image scanning apparatus according to , wherein the transportation means includes a return path for guiding the sheet from the downstream end of the inverting path to the scanner, and a guide member is located a bifurcation of the return path and the inverting path for opening one of the return and inverting paths and closing the other of the return and inverting paths, whereby it is possible to introduce the sheet into the return path after the sheet is fed towards the scanner from the downstream end of the inverting path.
claim 1
3. The image scanning apparatus according to or , wherein the transportation means includes at least one roller, and the reversing means includes at least one roller.
claim 1
2
4. The image scanning apparatus according to , wherein the guide member pivots as the transportation means rotates.
claim 2
5. The image scanning apparatus according to , wherein the guide member is operatively connected to the transportation means via a torque limiter.
claim 4
6. The image scanning apparatus according to , wherein three rollers are arranged to form two pairs of rollers, and one of the two pairs of rollers constitute the transportation means whereas the other pair of rollers constitute the reversing means.
claim 1
7. The image scanning apparatus according to further including discharging means for discharging the sheet from the image scanning apparatus after the two sides of the sheet are scanned, wherein the other pair of rollers also constitute the discharging means.
claim 6
8. The image scanning apparatus according to , wherein two rollers are arranged to constitute all of the transportation means, reversing means and discharging means.
claim 7
9. An apparatus for scanning front and back sides of a sheet comprising:
scanning means;
document feeding means for feeding sheets sheet by sheet, each sheet having front and back sides;
means for turning a sheet, which is fed from the document feeding means, upside down before scanning;
means for reversing a transportation direction of the sheet and feeding the sheet to the scanning means so as to scan a back side of the sheet;
means for reversing the transportation direction of the sheet after the scanning means scans the back side of the sheet;
means for feeding the sheet to the scanning means again to scan the back side of the sheet; and
means for discharging the sheet from the apparatus.
10. A method of scanning front and back sides of a sheet comprising the steps of:
A) feeding a sheet into a scanning machine;
B) turning the sheet upside down before scanning;
C) reversing a transportation direction of the sheet and feeding the sheet to a scanner so as to scan a back side of the sheet;
D) reversing the transportation direction of the sheet after the scanner scans the back side of the sheet;
E) feeding the sheet to the scanner again to scan the back side of the sheet; and
F) discharging the sheet from the scanning machine.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US10/057,439 US6522860B2 (en) | 2000-06-06 | 2002-01-25 | Image scanning apparatus |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000-169170 | 2000-06-06 | ||
JP2000169170A JP4122686B2 (en) | 2000-06-06 | 2000-06-06 | Paper transport device |
JP2000-212373 | 2000-07-13 | ||
JP2000212373 | 2000-07-13 | ||
JP2000-357409 | 2000-11-24 | ||
JP2000357409A JP3446736B2 (en) | 2000-07-13 | 2000-11-24 | Image reading device |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US10/057,439 Continuation US6522860B2 (en) | 2000-06-06 | 2002-01-25 | Image scanning apparatus |
Publications (2)
Publication Number | Publication Date |
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US20010048830A1 true US20010048830A1 (en) | 2001-12-06 |
US6434359B2 US6434359B2 (en) | 2002-08-13 |
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US09/875,386 Expired - Fee Related US6434359B2 (en) | 2000-06-06 | 2001-06-05 | Image scanning apparatus having a bifurcating guide member |
US10/057,439 Expired - Lifetime US6522860B2 (en) | 2000-06-06 | 2002-01-25 | Image scanning apparatus |
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Application Number | Title | Priority Date | Filing Date |
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US10/057,439 Expired - Lifetime US6522860B2 (en) | 2000-06-06 | 2002-01-25 | Image scanning apparatus |
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US10787007B2 (en) * | 2018-03-30 | 2020-09-29 | Brother Kogyo Kabushiki Kaisha | Printing device |
US11285736B2 (en) * | 2018-03-30 | 2022-03-29 | Brother Kogyo Kabushiki Kaisha | Printer |
CN110315866B (en) * | 2018-03-30 | 2022-05-03 | 兄弟工业株式会社 | Printer with a movable platen |
CN110315865B (en) * | 2018-03-30 | 2022-08-19 | 兄弟工业株式会社 | Printing apparatus |
Also Published As
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US6434359B2 (en) | 2002-08-13 |
US20020071702A1 (en) | 2002-06-13 |
US6522860B2 (en) | 2003-02-18 |
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