Patent US5887996A successfully refreshed from Google Patents.
US5887996A
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US
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Apparatus and method for sheet registration using a single sensor
Assignee: Xerox Corp
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Filing: 1998-01-08
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Granted: 1999-03-30
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Expires: 2018-01-08
Abstract
Abstract A deskewing and registering device for an electrophotographic printing machine. A single sensor determines the position and skew of a sheet in a paper path and generate signals indicative thereof. A pair of independently driven nips forward the sheet to a registration position in skew and at the proper time based on signals from a controller which interprets the position signals and generates the motor control signals. An additional single sensor can be used at the registration position to provide feedback for updating the control signals as rolls wear or different substrates having different coefficients of friction are used.
Inventors
- 👤 Vittorio R. Castelli
- 👤 Osman T. Polatkan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:28
CPC Classifications
B; B65; B65H; B65H9/00; B65H9/002; B41; B41J; B41J11/00; B41J11/0045; B41J11/0055; B41J13/00; B41J13/26; G; G03; G03G; G03G15/00; G03G15/65; G03G15/6555; G03G15/6558; G03G15/6561; G03G15/6564; G03G15/6567; B65H2511/00; B65H2511/20; B65H2511/24; B65H2601/00; B65H2601/10; B65H2601/12; B65H2601/121; G03G15/22; G03G15/23; G03G15/231; G03G15/232; G03G15/234; G03G15/235; G03G2215/00; G03G2215/00362; G03G2215/00535; G03G2215/00556; G03G2215/00561; G03G2215/00717; G03G2215/00721
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
111 words
An apparatus for registering and deskewing a sheet along a paper path, comprising: a single sensor only located along the paper path, to sense a position of a sheet in the paper path and to generate a signal indicative thereof; a pair of independently driven drive nips located in the paper path for forwarding a sheet therealong; a controller, to receive signals from said single sensor and to generate motor control drive signals for said pair of independently driven drive nips as a function of said signals so as to deskew and register a sheet at a registration position in the paper path downstream in the path from said single sensor.
Claim 2
Independent Claim
111 words
An apparatus for registering and deskewing a sheet along a paper path, comprising: a single sensor only located along the paper path, to sense a position of a sheet in the paper path and to generate a signal indicative thereof; a pair of independently driven drive nips located in the paper path for forwarding a sheet therealong; a controller, to receive signals from said single sensor and to generate motor control drive signals for said pair of independently driven drive nips as a function of said signals so as to deskew and register a sheet at a registration position in the paper path downstream in the path from said single sensor.
Claim 3
Dependent Claim
44 words
An apparatus according to claim 1, wherein said single sensor comprises: a first edge sensor located along a peripheral edge of the paper path, to sense both the arrival of a lead edge of a sheet and the lateral edge position of a sheet.
Claim 4
Dependent Claim
39 words
An apparatus according to claim 1, further comprising a second single sensor located at a position downstream of said first single sensor at the registration position to sense the position of the sheet and to generate signals indicative thereof.
Claim 5
Dependent Claim
28 words
An apparatus according to claim 3, wherein the signals from said second single sensor are used to update said controller so that sheets are properly deskewed and registered.
Claim 6
Dependent Claim
108 words
An electrophotographic printing machine having a device for registering and deskewing a sheet along a paper path comprising: a single sensor only located along the paper path, to sense a position of a sheet in the paper path and to generate a signal indicative thereof; a pair of independently driven drive nips located in the paper path for forwarding a sheet therealong; a controller, to receive signals from said single sensor and to generate motor control drive signals for said pair of independently driven drive nips as a function of said signals so as to deskew and register a sheet at a registration position in the paper path.
Claim 7
Dependent Claim
108 words
An electrophotographic printing machine having a device for registering and deskewing a sheet along a paper path comprising: a single sensor only located along the paper path, to sense a position of a sheet in the paper path and to generate a signal indicative thereof; a pair of independently driven drive nips located in the paper path for forwarding a sheet therealong; a controller, to receive signals from said single sensor and to generate motor control drive signals for said pair of independently driven drive nips as a function of said signals so as to deskew and register a sheet at a registration position in the paper path.
Claim 8
Dependent Claim
45 words
A printing machine according to claim 5, wherein said single sensor comprises: a first edge sensor located along a peripheral edge of the paper path, to sense both the arrival of a lead edge of a sheet and the lateral edge position of a sheet.
Claim 9
Dependent Claim
40 words
A printing machine according to claim 5, further comprising a second single sensor located at a position downstream of said first single sensor at the registration position to sense the position of the sheet and to generate signals indicative thereof.
Claim 10
Dependent Claim
29 words
A printing machine according to claim 7, wherein the signals from said second single sensor are used to update said controller so that sheets are properly deskewed and registered.
Claim 11
Independent Claim
120 words
A method for registering and deskewing a sheet along a paper path, comprising: sensing the lead edge position and edge position of a sheet with a single sensor only to sense a position of a sheet in the paper path and to generate a signal indicative thereof; determining a skew angle error and a registration position error of the sheet and generating a set of signals indicative thereof; driving a pair of drive nips independently pursuant to said set of signals as a function of the skew angle error and registration position error so that the sheet arrives at a registration position downstream in the paper path from the single sensor at a proper time and in proper alignment position.
Claim 12
Independent Claim
120 words
A method for registering and deskewing a sheet along a paper path, comprising: sensing the lead edge position and edge position of a sheet with a single sensor only to sense a position of a sheet in the paper path and to generate a signal indicative thereof; determining a skew angle error and a registration position error of the sheet and generating a set of signals indicative thereof; driving a pair of drive nips independently pursuant to said set of signals as a function of the skew angle error and registration position error so that the sheet arrives at a registration position downstream in the paper path from the single sensor at a proper time and in proper alignment position.
Claim 13
Dependent Claim
37 words
A method according to claim 9, further comprising checking a position of the sheet at the registration position with a second single sensor and sending the position information to a controller to update a drive control function.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-03-29 | 2002-09-28 | 2003-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-03-29 | 2006-09-28 | 2007-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-03-29 | 2010-09-28 | 2011-03-30 | $7700.00 | Window Closed / Lapsed |