PREFLIPPING SHEETS FOR A DUPLEX OPERATION
A method for feeding sheets includes feeding a first sheet to a location for flipping sheets with respect to a target position before the first sheet is fed passed the target position. A second face of the first sheet is fed passed the target position. The first sheet is fed to a second location for flipping sheets with respect to the target position. The second location is different than the first location. A first face of the first sheet is fed passed the target position.
Many imaging devices such as printers, copiers, and scanners have document feeders with duplexing capabilities. These document feeders allow a stack of original to be placed face up in an input tray. The top sheet is pulled from the stack of originals. Each face of that sheet is fed passed a scanner. The sheet is then placed into an output bin. The process repeats until the input tray is emptied. To maintain proper sheet order in the output bin, each sheet is fed passed the scanner three times. The two faces of the sheet are scanned on the first two passes with the sheet being flipped between passes. The third pass is used to flip the sheet to achieve correct order output. This third pass, however, ties up the scanner and limits the speed at which the stack of originals can be fed through the document feeder.
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Various embodiments of the present invention operate to improve the throughput of a document feeder such as document feeder 10 when engaged in a duplex operation. To achieve this goal each sheet is pre flipped and then fed passed a scanner only twice with a different face of sheet being scanned on each pass. In this manner the scanner is utilized on each pass.
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In
Document feeder 10 also includes a media path having various path segments S1, S2, S3, and S4. Also shown are input gate 34, pre-target gate 36, and post target gate 38. A path segment is a path along which a sheet from stack 24 can be fed by one or more of feeders 26, 28, 30, and 32. Path segment Si extends from input feeder 26 to target feeder and on to post-target feeder. Path segment S2 extends from input feeder 26 through pre-target feeder 28. Path segment S3 extends from pre-target feeder 28 to target feeder 30 merging with path segment S1. Path segment S4 extends from post-target feeder 32 back to target feeder 30 also merging with path segment S1.
Gates 34, 36, and 38 are each moveable between a first position and a second position. The particular path segments S1, S2, S3, and S4 a sheet travels along between input tray 12 and output bin 14 depends in part on the positioning of gates 34, 36, and 38. In the Example of
The positioning of pre-target gate 36 allows input feeder 26 to feed a sheet to pre-target feeder 28 along path segment S2 until the sheet is fed passed pre-target gate 36. Pre-target gate 36 can then be repositioned so that pre-target feeder 28 can then feed the sheet along path segment S3 to target feeder 30. The positioning of post-target gate 38 allows target feeder 30 to feed a sheet to post-target feeder 32 along path segment Si until the sheet is fed passed post-target gate 38. Post-target gate 38 can then be repositioned so that post-target feeder 32 can then feed sheet back to target feeder 30 along path segment S4.
Pre-target gate 36 and post-target gate 38 may be actively positioned by a mechanical switching lever or solenoid as discussed above with respect to input gate 34. Alternatively, gates 36 and 38 may be passively position. For example, pre-target gate 36 may be held in a default closed position in which a sheet can be fed by pre-target feeder 28 along path segment S3 to target feeder 30. The leading edge of a sheet being fed along path segment S2 opens the pre-target gate 36 as it pushes through at the urging of input feeder 26. Pre-target gate 36 automatically closes after the trailing edge of the sheet has cleared pre-target gate 36. Similarly, post-target gate may be held in a default closed position in which a sheet can be fed by post-target feeder 32 along path segment S4 back to target feeder 30. The leading edge of a sheet being fed along path segment S1 opens the post-target gate 38 as it pushes through at the urging of target feeder 30 allowing the sheet to reach post-target feeder 32. Post-target gate 38 automatically closes after the trailing edge of the sheet has cleared post-target gate 38. Is such a passive implementation, pre-target gate 36 and post-target gate 38 could be flaps of flexible material such as polyester films.
Scanner 40 is shown situated at target position 46. Target position 46 represents a position along path segment S1 at which an action can take place with respect to a face of a sheet. In the example of
Second feeder driver 48 represents components configured to drive target feeder 30 and post-target feeder 32 causing feeders 30 and 32 to feed a sheet. With reference back to
Where pre-target gate 36 and post-target gate 38 are positioned passively, actuators 54 and 56 would not be included. Otherwise, pre-target gate actuator 54 is configured to selectively position pre-target gate 36 so that a sheet being fed along media path S2 can reach pre-target feeder 28. Pre-target gate actuator 54 can also reposition pre-target gate 36 so that pre-target feeder can be reversed to feed a sheet along path segment S3 to target position 46. Post-target gate actuator 56 is configured to selectively position post-target gate 38 so that a sheet being fed by target feeder 30 along media path S1 can reach post-target feeder 32. Post-target gate actuator 56 can also reposition post-target gate 38 so that post-target feeder 32 can be reversed to feed a sheet along path segment S4 back to target position 46.
Controller 58 represents generally any combination of hardware and programming capable of controlling the operation of first and second feeder drivers 48 and 50 and gate actuators 52, 54, and 56 to cause a stack of sheets to be sequentially fed through document feeder 10. Controller 58 can receive instructions from a user via user interface 16. Referring back to
A user may instead request a duplex operation in which sheets are sequentially fed from input tray 12 along path segment S2, inverted and passed along path segment S3 to path segment S1 passed target position 46. The sheets are then inverted again and passed along path segment S4 to path segment S1, back passed target position 46 and then deposited into output bin 14. In this manner, each sheet makes two passes passed target position 46 with a different face facing target position 46 on each pass.
Moving to
Referring now to
Moving to
Referring now to
Moving to
Referring now to
Note also, that controller 58 has instructed input gate actuator 52 and pre-target gate actuator 54 to position input gate 34 and pre-target gate 36 in positions allowing sheets to be fed from input tray 12 along path segment S2 to pre-target feeder 28. Controller 58 has also instructed first feeder driver 48 to cause input feeder 26 to feed a subsequent sheet 68 from stack 24. The positioning of input gates 34 and 36 allow sheet 62 to travel along path segment S2 to pre-target feeder 28. In this manner, sheet 68 can be pulled by pre-target feeder 28 into the location for flipping sheets while the immediately prior sheet 62 is still being fed through document feeder 10. In other words, subsequent sheet 68 can be fed into the first location for flipping sheets before sheet 62 completes its second pass passed target position 46
In
Note also that controller 58 has instructed first feeder driver 48 to cause pre-target feeder 28 to pull sheet 68 into the first location for flipping sheet 68 with respect to target position 46. Controller 58 has also instructed pre-target gate actuator 54 to position pre-target gate 36 so that pre-target feeder 28 can feed sheet 68 along path segment S3. In this location for flipping, sheet 68 has been pulled passed pre-target gate 36 with edge 70 leading and edge 72 trailing. Sheet 68 can be flipped by reversing its direction of travel so that edge 72 leads sheet 68 along path segment S3.
Moving on to
It is noted that while only two sheets 62 and 68 are described as being involved in a duplex operation the operation could involve any number of sheets with each subsequent sheet following the same path segments through document feeder 10. Each subsequent sheet is fed into a first location for flipping the sheet before an immediately prior sheet has completed its second pass passed target position 46. Each subsequent sheet is then fed on its first pass passed target position 46 once an immediately prior sheet has completed its second pass passed target position 46.
It is also noted that
O
A second face of the sheet is then fed passed the target position (step 76). Next, the sheet is fed to a second position for flipping media sheets (step 77). A first face of the sheet is then fed passed the target position (step 78). At this point, the sheet has passed the target position only twice with a different face facing the target position on each pass. The sheet can then be output following the second pass. Examples of steps 76 and 78 are illustrated in
Steps 74-78, for example may be performed following receipt of a user's instruction for a duplex operation. Such an instruction may be entered via user interface 16 shown in
The duplex operation may involve feeding a plurality of sheets in which case the plurality of sheets are sequentially fed to the location for flipping sheets. The plurality of sheets are sequentially fed so that each subsequent sheet makes a first pass passed the target position and then a second pass passed the target position with a different face facing the target position on each pass. In doing so, each subsequent sheet is fed to the location for flipping sheets before an immediately prior sheet completes its second pass passed the target position. Moreover, that same subsequent sheet is fed to make a first pass passed the target position after the immediately prior sheet has made its second pass passed the target position.
Moving to
A second sheet is fed to the first location for flipping sheets with respect to the target position before the second sheet is fed passed the target position (step 86). Meanwhile, the first sheet is flipped, and a first face of the first sheet is fed passed the target position (step 88). The second sheet is flipped and a second face of the second sheet is fed passed the target position (step 90). An example of steps 86, 88, and 90 is illustrated in
The second sheet is fed to the second location for flipping sheets with respect to the target position (step 92). The second sheet is flipped and a first face of the second sheet is fed passed the target position (step 94). At this point both faces of the first sheet and the second sheet have been fed passed the target position with each sheet making only two passes passed the target position. After making its second pass passed the target position each or the first and second sheets may be output.
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Also, the present invention can be embodied in any computer-readable media for use by or in connection with an instruction execution system such as a computer/processor based system or an ASIC (Application Specific Integrated Circuit) or other system that can fetch or obtain the logic from computer-readable media and execute the instructions contained therein. “Computer-readable media” can be any media that can contain, store, or maintain programs and data for use by or in connection with the instruction execution system. Computer readable media can comprise any one of many physical media such as, for example, electronic, magnetic, optical, electromagnetic, or semiconductor media. More specific examples of suitable computer-readable media include, but are not limited to, a portable magnetic computer diskette such as floppy diskettes or hard drives, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory, or a portable compact disc.
Although the flow diagrams of
The present invention has been shown and described with reference to the foregoing exemplary embodiments. It is to be understood, however, that other forms, details and embodiments may be made without departing from the spirit and scope of the invention that is defined in the following claims.
Claims
1. A method for feeding sheets, comprising:
- feeding a first sheet to a location for flipping sheets with respect to a target position before the first sheet is fed passed the target position;
- feeding a second face of the first sheet passed the target position;
- feeding the first sheet to a second location for flipping sheets with respect to the target position, the second location being different than the first location; and
- feeding a first face of the first sheet passed the target position.
2. The method of claim 1, wherein the acts of feeding are performed following receipt of an instruction for a duplex operation, the method further comprising, following receipt of an instruction for a simplex operation, feeding the first face of the first sheet passed the target position without feeding the first sheet to the first location for flipping sheets with respect to the target position.
3. The method of claim 1, further comprising outputting the first sheet after feeding the first face of the first sheet passed the target position.
4. The method of claim 1, further comprising:
- feeding a second sheet to the first location for flipping sheets before first face of the first sheet has been fully fed passed the target position; and
- after the first face of the first sheet has been fully fed passed the target position, feeding a second face of the second sheet passed the target position, feeding the second sheet to the second location for flipping media sheets, and feeding a first face of the second media sheet passed the target position.
5. The method of claim 1, further comprising: sequentially feeding each of a plurality of subsequent sheet to the first location for flipping sheets;
- for each subsequent sheet fed to the first position for flipping sheets, feeding a second face of that sheet passed the target position, feeding that sheet to the second location for flipping media sheets, and feeding a first face of that sheet passed the target position;
- wherein each subsequent sheet is fed to the first location for flipping sheets before the first face an immediately prior has been fully fed passed the target position and wherein the first face of that subsequent sheet is fed passed the target position after the first face of the immediately prior sheet has been fully fed passed the target position.
6. A method for feeding sheets, comprising:
- feeding a first sheet to a first location for flipping sheets with respect to a target position before the first sheet is fed passed the target position;
- flipping the first sheet and feeding a second face of the first sheet passed the target position;
- feeding the first sheet to a second location for flipping sheets with respect to the target position, the second location being different than the first location;
- flipping the first sheet and feeding a first face of the first sheet passed the target position; and
- feeding a second sheet to the first location for flipping sheets before the first face of the first sheet completes its pass passed the target position.
7. The method of claim 6, wherein the acts of feeding and flipping are performed following receipt of instructions for a duplex operation, the method further comprising, following receipt of instructions for a simplex operation, feeding the first face of the first sheet passed the target position without flipping the first sheet.
8. The method of claim 6, further comprising outputting the first sheet after the first face of the first sheet is fed passed the target position.
9. The method of claim 6, further comprising:
- after feeding the first face of the first sheet passed the target position, feeding the second face of the second sheet passed the target position;
- feeding the second sheet to the second location for flipping sheets with respect to the target position; and
- feeding a first face of the second sheet passed the target position.
10. The method of claim 6, comprising:
- sequentially feeding each of a plurality of subsequent sheets to the first location for flipping sheets;
- for each of the subsequent sheets, feeding a second face of that subsequent sheet passed the target position, feeding the subsequent sheet to a second location for flipping the first sheet with respect to the target position, and feeding a first face of the subsequent sheet passed the target position;
- wherein each subsequent sheet:
- is fed to the first location for flipping sheets before the first face of an immediately prior sheet is fully fed passed the target position; and
- the second face of that subsequent sheet is fed passed the target position after the first face of the immediately prior sheet has been fully fed passed the target position.
11. A system for feeding sheets, comprising a first feeder and a second feeder, wherein:
- the first feeder is operable to feed a sheet to a first location for flipping sheets with respect to a target position before the sheet is fed passed the target position and to feed the sheet to the second feeder; and the second feeder is operable to feed a second face of the sheet passed the target position, to feed the sheet to a second position for flipping sheets with respect to the target position, and to feed a first face of the media sheet passed the target position.
12. The system of claim 11, wherein the first feeder includes an input feeder and a pre-target feeder, the input feeder being operable to feed the sheet to the pre-target feeder along a first path segment and the pre-target feeder being operable to feed the sheet to the first location for flipping sheets and to feed the sheet.
13. The system of claim 12, wherein the sheet has a first edge and a second edge, and wherein the input feeder is operable to feed the sheet with the first edge as a leading edge along the first path segment, and wherein the pre-target feeder is operable to feed the sheet with the second edge as the leading edge along a second path segment to the second feeder.
14. The system of claim 11, wherein the second feeder includes a target feeder and a post-target feeder, the target feeder being operable to feed the sheet passed the target position on to the post-target feeder along a third path segment and wherein the post-target feeder is operable to feed the sheet back to the target feeder along a fourth path segment, the fourth path segment merging with the third path segment.
15. The system of claim 14, wherein the sheet has a first edge and a second edge and wherein the target feeder is operable to feed the sheet with the second edge as a leading edge along the third path segment, wherein the post-target feeder is operable to feed the sheet into a second location for flipping sheets with respect to the target position and to feed the sheet with the first edge leading the sheet along the fourth path segment.
16. The system of claim 11, further comprising a first feeder driver, a second feeder, and a controller and wherein the first feeder includes an input feeder and a pre-target feeder, the second feeder includes a target feeder and a post-target feeder, and the sheet has a first edge and a second edge, wherein:
- the first feeder driver is operable to drive the input feeder and the pre-target feeder;
- the second feeder driver is operable to drive the target feeder and the post-target feeder; and
- the controller is operable to instruct:
- the first feeder driver to cause the input feeder and the pre-target feeder to feed the sheet with the first edge leading along a first path segment to the first location for flipping sheets;
- the first feeder driver to cause the pre-target feeder to feed the sheet to the target feeder with the second edge leading along a second path segment to the target feeder;
- the second feeder driver to cause the target feeder and the post-target feeder to feed the sheet passed the target position with the second edge leading along a third path segment to a second location for flipping sheets;
- the second feeder driver to cause the post-target feeder to feed the sheet with the first edge leading along a fourth path segment back to the target feeder, the fourth path segment merging with the third path segment; and
- the second feeder driver to cause the target feeder to feed the sheet passed the target position with the first edge leading along the third path segment.
17. A document feeder, comprising an input feeder, a pre-target feeder, a target feeder, a post target feeder, a first location for flipping sheets and a second location for flipping sheets, wherein:
- a first path segment extends from the input feeder to the target feeder and on to the post-target feeder and the second position for flipping media sheets;
- a second path segment extends from the input feeder to the pre-target feeder and on to the first location for flipping media sheets;
- a third path segment extends from the pre-target feeder merging with the first path segment; and
- a fourth path segment extending from the post-target position and merging with the first path segment.
18. The document feeder of claims 17, further comprising an input gate moveable between a first position and a second position, wherein:
- when the input gate is moved to the first position, the input feeder is operable to feed a media sheet along the first path segment; and
- when the input gate is moved to the second position, the input feeder is operable to feed the sheet along the second path segment.
19. The document feeder of claim 17, wherein:
- the pre-target feeder is operable to feed a sheet with a first edge leading along the second path segment to the first position for flipping sheets and to feed the sheet with a second edge leading along the third path segment; and
- the post target feeder is operable to operable to feed the sheet with the second edge leading along the first path segment to the second position for flipping sheets and to feed the sheet with the first edge leading along the fourth path segment.
20. The document feeder of claim 17, further comprising a controller and feeder drivers operable to drive the input feeder, the pre-target feeder, the target feeder and the post-target feeder, wherein the controller is operable to instruct the feeder drivers to cause:
- the input feeder and the pre-target feeder to feed a first sheet with the a edge leading along the second path segment to the first location for flipping sheets the pre-target feeder to feed the first sheet to the target feeder with a second edge leading along the third path segment and into the first path segment;
- the target feeder and the post-target feeder to feed the first sheet with the second edge leading along the first path segment to the second location for flipping sheets the post-target feeder to feed the first sheet with the first edge leading along the fourth path segment back into the first path segment;
- the target feeder to feed the first sheet passed with the first edge leading along the first path segment; and
- the first feeder to cause the input feeder and the pre-target-feeder to feed a second sheet to the first position for flipping media sheets before the target feeder feeds the first sheet with its first edge leading along the first path segment.
Type: Application
Filed: Apr 26, 2007
Publication Date: Oct 30, 2008
Inventor: Wayne E. Foote (Eagle, ID)
Application Number: 11/740,521
International Classification: B65H 7/02 (20060101);