US5568227A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for transport speed optimization to minimize image smear
Assignee: Xerox Corp
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Filing: 1994-12-05
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Granted: 1996-10-22
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Expires: 2014-12-05
Abstract
Abstract A method and apparatus for minimizing image smear. A plurality of sheets are printed, each having the same test pattern thereon but varying a sheet transport speed as each sheet is printed. The sheets are then scanned by the machine and a velocity profile for each sheet is created. The velocity profile is then used to determine a standard deviation and a mean velocity which are then calculated and stored or can be plotted for each sheet. The point at which the relationship between the standard deviation and the mean results in the lowest value is the optimum speed for the subsystem being calibrated. The test is then performed on a second subsystem and repeated several times so that the optimum speeds for the pre and post transfer drives are quickly and easily determined.
Inventors
- 👤 Lam F. Wong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:33
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/65; G03G15/6555; G03G15/657; G03G15/6558; G03G15/6561; G03G15/6564; H; H04; H04N; H04N1/00; H04N1/23; H04N1/29; H04N1/295; G03G2215/00; G03G2215/00362; G03G2215/00535; G03G2215/00556; G03G2215/00569
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
72 words
A method for optimizing the speed of a first sheet transport, comprising: printing a test pattern on a plurality of sheets; varying the velocity of the sheet transport for each one of the plurality of printed sheets; determining a velocity profile for each one of the plurality of sheets; and determining an optimized velocity for the sheet transport as a function of the velocity profile for each of the plurality of sheets.
Claim 2
Independent Claim
72 words
A method for optimizing the speed of a first sheet transport, comprising: printing a test pattern on a plurality of sheets; varying the velocity of the sheet transport for each one of the plurality of printed sheets; determining a velocity profile for each one of the plurality of sheets; and determining an optimized velocity for the sheet transport as a function of the velocity profile for each of the plurality of sheets.
Claim 3
Dependent Claim
37 words
A method according to claim 1, further comprising incrementally varying the speed of a subsystem over a preselected range so that each of the plurality of sheets corresponds to a different incremental velocity for the selected subsystem.
Claim 4
Dependent Claim
35 words
A method according to claim 2, further comprising determining the standard deviation and velocity mean for each of the plurality of printed sheets as a function of the velocity profile of each of the sheets.
Claim 5
Dependent Claim
29 words
A method according to claim 3 wherein said velocity optimizated determining step comprises determining a velocity having a lowest ratio of standard deviation with respect to the mean velocity.
Claim 6
Dependent Claim
19 words
A method according to claim 4, further comprising setting the velocity of the sheet transport to the optimized velocity.
Claim 7
Independent Claim
76 words
A method for minimizing image transfer smear in a printing machine having a sheet transport, comprising: printing a test pattern on a plurality of sheets; varying the velocity of the sheet transport for each one of the plurality of printed sheets; determining a velocity profile for each one of the plurality of sheets; and determining an optimized velocity for the sheet transport as a function of the velocity profile for each of the plurality of sheets.
Claim 8
Independent Claim
76 words
A method for minimizing image transfer smear in a printing machine having a sheet transport, comprising: printing a test pattern on a plurality of sheets; varying the velocity of the sheet transport for each one of the plurality of printed sheets; determining a velocity profile for each one of the plurality of sheets; and determining an optimized velocity for the sheet transport as a function of the velocity profile for each of the plurality of sheets.
Claim 9
Dependent Claim
37 words
A method according to claim 6, further comprising incrementally varying the speed of a subsystem over a preselected range so that each of the plurality of sheets corresponds to a different incremental velocity for the sheet transport.
Claim 10
Dependent Claim
34 words
A method according to claim 7, further comprising determining the standard deviation and velocity mean for each of the plurality of sheets as a function of the velocity profile of each of the sheets.
Claim 11
Dependent Claim
30 words
A method according to claim 8 wherein said velocity setpoint optimized determining step comprises determining a velocity having a lowest ratio of standard deviation with respect to the mean velocity.
Claim 12
Dependent Claim
20 words
A method according to claim 9, further comprising setting the velocity of the first sheet transport to the optimized velocity.
Claim 13
Independent Claim
86 words
An apparatus for minimizing image transfer smear in a printing machine, comprising: a photoreceptive member moving at a preselected velocity; a sheet transport adjacent said photoreceptive member for delivering a sheet to said photoreceptive member; a controller to control the velocity of said transport; and a scanner operatively associated with said controller, for scanning a plurality of sheets and generating a signal indicative of a pattern printed on the plurality of sheets, said controller responsive to the signal, generating a velocity control signal for the transport.
Claim 14
Independent Claim
86 words
An apparatus for minimizing image transfer smear in a printing machine, comprising: a photoreceptive member moving at a preselected velocity; a sheet transport adjacent said photoreceptive member for delivering a sheet to said photoreceptive member; a controller to control the velocity of said transport; and a scanner operatively associated with said controller, for scanning a plurality of sheets and generating a signal indicative of a pattern printed on the plurality of sheets, said controller responsive to the signal, generating a velocity control signal for the transport.
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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) | 1999-10-22 | 2000-04-22 | 2000-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-10-22 | 2004-04-22 | 2004-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-10-22 | 2008-04-22 | 2008-10-22 | $7700.00 | Window Closed / Lapsed |