US5022966A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for controlling properties of travelling sheets
Assignee: Honeywell Measurex Corp
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Filing: 1989-12-13
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Granted: 1991-06-11
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Expires: 2009-12-13
Abstract
Abstract A method for controlling high-speed sheetmaking machine after abrupt process changes and during start-up periods and the like, includes operating a scanning sensor to periodically traverse back and forth across a sheet in the cross direction to detect values of selected sheet property along each scan while the cross-directional width of each scan is controlled to be substantially less than the width of the sheet being scanned.
Inventors
- 👤 Hung-Tzaw Hu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:00
CPC Classifications
D; D21; D21G; D21G9/00; D21G9/0009
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
104 words
A method for controlling high-speed sheetmaking machine after abrupt process changes, comprising: operating a scanning sensor to periodically traverse back and forth across the full width of a sheet in the cross direction to detect values of a selected sheet property along each scan; the scanning sensor having a normal cross-directional speed and a normal rate at which measurements of the sheet property are made when the scanning sensor traverses the full width of the sheet; and after an abrupt process change, controllably changing the cross-directional width of each scan to be substantially less than the entire width of the sheet subject to scanning.
Claim 2
Independent Claim
104 words
A method for controlling high-speed sheetmaking machine after abrupt process changes, comprising: operating a scanning sensor to periodically traverse back and forth across the full width of a sheet in the cross direction to detect values of a selected sheet property along each scan; the scanning sensor having a normal cross-directional speed and a normal rate at which measurements of the sheet property are made when the scanning sensor traverses the full width of the sheet; and after an abrupt process change, controllably changing the cross-directional width of each scan to be substantially less than the entire width of the sheet subject to scanning.
Claim 3
Dependent Claim
21 words
The method of claim 1 wherein the midpoint of each scan is substantially at the centerline of the sheet being scanned.
Claim 4
Dependent Claim
21 words
The method of claim 1 wherein the midpoint of each scan is not at the centerline of the sheet being scanned.
Claim 5
Dependent Claim
22 words
The method of claim 1 including the step of calculating the average of the detected values at the end of each scan.
Claim 6
Dependent Claim
21 words
The method of claim 4 wherein the scanning sensor is capable of standardization and the averages are calculated without sensor standardization.
Claim 7
Dependent Claim
40 words
The method of claim 1 wherein the rate at which measurements of a sheet property are made in decreased from its normal rate whenever the cross-directional width of a scan is less than the width of the sheet being scanned.
Claim 8
Dependent Claim
37 words
The method of claim 1 wherein the cross-directional speed of the scanning sensor is increased from its normal cross-sectional speed whenever the cross-directional width of a scan if less than the width of the sheet being scanned.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-06-10 | 1994-12-10 | 1995-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-10 | 1998-12-10 | 1999-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-10 | 2002-12-10 | 2003-06-11 | $7700.00 | Window Closed / Lapsed |