EP0351260A2
Expired / Lapsed
EP
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Cross-directional control of sheetmaking systems
Assignee: Honeywell Measurex Corp
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Filing: 1989-06-14
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Granted: —
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Expires: 2009-06-14
Abstract
Abstract A system and method for controlling sheetproducing machines includes measurement devices (11) for measuring properties of a sheet at cross-directional locations to provide cross-directional profiles, and spatial-frequency splitting means (15) for separating low spatial-frequency components from high spatial-frequency components for each profile. The separated high and low spatial-frequency components provide operating signals to controllably adjust properties of the sheet.
Inventors
- 👤 Ramesh Balakrishnan
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 12:34
CPC Classifications
G; G01; G01N; G01N23/00; G01N23/02; G01N23/06; G01N23/16; G01N33/00; G01N33/34; G01N33/346
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
90 words
A system for controlling cross-directional sheet properties during production of sheets on sheetprocessing machines, comprising: measurement means for providing measurements of at least one property of a sheet during production, which measurements are made at a plurality of cross-directional locations that successively span the sheet and which can be assembled to provide cross-directional profiles of the sheet; spatial-frequency splitting means for operating upon the output of the measurement means to separate selected spatial-frequency components from each cross-directional profile to provide operating signals to cross-directional control devices based upon selected spatial-frequencies.
Claim 2
Independent Claim
90 words
A system for controlling cross-directional sheet properties during production of sheets on sheetprocessing machines, comprising: measurement means for providing measurements of at least one property of a sheet during production, which measurements are made at a plurality of cross-directional locations that successively span the sheet and which can be assembled to provide cross-directional profiles of the sheet; spatial-frequency splitting means for operating upon the output of the measurement means to separate selected spatial-frequency components from each cross-directional profile to provide operating signals to cross-directional control devices based upon selected spatial-frequencies.
Claim 3
Dependent Claim
21 words
A system according to Claim 1 wherein the spatial-frequency splitting means separates high spatial-frequencies from low spatial-frequencies for each cross-directional profile.
Claim 4
Dependent Claim
27 words
A system according to Claim 1 wherein the spatial-frequency splitting means separates high spatial-frequencies from low spatial-frequencies by computing a running average of measurements for each profile.
Claim 5
Dependent Claim
39 words
A system according to Claim 1 wherein the spatial-frequency splitting means separates low spatial-frequencies from each profile by computing a low spatial-frequency profile and then subtracting the computed low spatial-frequency profile from the profile from which it was derived.
Claim 6
Dependent Claim
19 words
A system according to Claim 1 wherein the spatial-frequency splitting means separates high spatial-frequencies from low spatial-frequencies by convolution.
Claim 7
Dependent Claim
19 words
A system according to Claim 5 wherein the convolution is accomplished by convolving cross-directional profiles with a Blackman-type function.
Claim 8
Dependent Claim
26 words
A system according to Claim 1 further including averaging means operative upon the selected spatial-frequency components to compute arithmetical averages for selected groups of the components.
Claim 9
Independent Claim
106 words
A system for controlling cross-directional sheet properties on sheetprocessing machines, comprising: measurement means for providing measurements of a property of a sheet during production, which measurements are made at a plurality of cross-directional locations that successively span the sheet and which can be assembled to provide cross-directional profiles of the sheet; averaging means for computing arithmetical averages of selected groups of measurements provided by the measurement means; spatial-frequency splitting means for operating upon the averaged values provided by the averaging means to separate selected spatial-frequency components from the profile of measurements for each cross-directional profile for operating devices to control sheet properties in the cross direction.
Claim 10
Independent Claim
106 words
A system for controlling cross-directional sheet properties on sheetprocessing machines, comprising: measurement means for providing measurements of a property of a sheet during production, which measurements are made at a plurality of cross-directional locations that successively span the sheet and which can be assembled to provide cross-directional profiles of the sheet; averaging means for computing arithmetical averages of selected groups of measurements provided by the measurement means; spatial-frequency splitting means for operating upon the averaged values provided by the averaging means to separate selected spatial-frequency components from the profile of measurements for each cross-directional profile for operating devices to control sheet properties in the cross direction.
Claim 11
Dependent Claim
21 words
A system according to Claim 8 wherein the spatial-frequency splitting means separates high spatial-frequencies from low spatial-frequencies for each cross-directional profile.
Claim 12
Dependent Claim
27 words
A system according to Claim 8 wherein the spatial-frequency splitting means separates high spatial-frequencies from low spatial-frequencies by computing a running average of measurements for each profile.
Claim 13
Dependent Claim
19 words
A system according to Claim 8 wherein the spatial-frequency splitting means separates high spatial-frequencies from low spatial-frequencies by convolution.
Claim 14
Dependent Claim
39 words
A system according to Claim 8 wherein the spatial-frequency splitting means separates low spatial-frequencies for each profile by computing a low spatial-frequency profile and then subtracting the computed low spatial-frequency profile from the profile from which it was derived.
Claim 15
Independent Claim
73 words
A system for operating cross-directional control devices on sheetproducing machines, comprising: measuring means for providing measurements of at least one property of a sheet at cross-directional locations, which measurements can be assembled to provide cross-directional profiles of the at least one property; spatial-frequency splitting means for separating low spatial-frequency components from high-spatial frequency components for each profile to provide operating signals to devices that controllably adjust properties of a sheet at cross-directional locations.
Claim 16
Independent Claim
73 words
A system for operating cross-directional control devices on sheetproducing machines, comprising: measuring means for providing measurements of at least one property of a sheet at cross-directional locations, which measurements can be assembled to provide cross-directional profiles of the at least one property; spatial-frequency splitting means for separating low spatial-frequency components from high-spatial frequency components for each profile to provide operating signals to devices that controllably adjust properties of a sheet at cross-directional locations.
Claim 17
Dependent Claim
27 words
A system according to Claim 13 wherein the spatial-frequency splitting means separates high spatial-frequencies from low spatial-frequencies by computing a running average of measurements for each profile.
Claim 18
Dependent Claim
39 words
A system according to Claim 13 wherein the spatial-frequency splitting means separates low spatial-frequencies for each profile by computing a low spatial-frequency profile and then subtracting the computed low spatial-frequency profile from the profile from which it was derived.
Claim 19
Dependent Claim
72 words
A process for providing cross-directional control in sheetproduction systems, comprising the steps of: measuring a traveling sheet at a plurality of cross-directional locations to provide profiles of the cross-directional measurements of at least one selected property of the sheet; for the plurality of measurements in each profile, separating selected spatial-frequency components of the profile from other spatial-frequency components; and controlling the sheetproduction system based upon selected spatial-frequency components of the measurement profiles.
Claim 20
Dependent Claim
72 words
A process for providing cross-directional control in sheetproduction systems, comprising the steps of: measuring a traveling sheet at a plurality of cross-directional locations to provide profiles of the cross-directional measurements of at least one selected property of the sheet; for the plurality of measurements in each profile, separating selected spatial-frequency components of the profile from other spatial-frequency components; and controlling the sheetproduction system based upon selected spatial-frequency components of the measurement profiles.
Claim 21
Dependent Claim
25 words
A process according to Claim 16 wherein the step of separating selected spatial-frequency components comprises separating high spatial-frequencies from low spatial-frequencies for each cross-directional profile.
Claim 22
Dependent Claim
26 words
A process according to Claim 17 wherein the step of separating high spatial-frequencies from low spatial-frequencies comprises computing a running average of measurements for each scan.
Claim 23
Dependent Claim
37 words
A process according to Claim 17 wherein the step of separating low spatial-frequencies is accomplished by computing a low spatial-frequency profile and then subtracting the computed low spatial-frequency profile from the profile from which it was derived.
Claim 24
Dependent Claim
17 words
A process according to Claim 17 wherein the high spatial-frequencies are separated from low spatial-frequencies by convolution.
Claim 25
Dependent Claim
19 words
A process according to Claim 17 wherein the convolution is accomplished by convolving cross-directional profiles with a Blackman-type function.
Claim 26
Dependent Claim
18 words
A process according to Claim 17 further including computing arithmetical averages for selected groups of the separated components.
Claim 27
Independent Claim
87 words
A system for controlling sheet properties during production of sheets on sheetprocessing machines, comprising: measurement means for providing measurements of at least one property of a sheet during production, which measurements are made at a plurality of machine-directional locations along the same slice location on a sheet; spatial-frequency splitting means for operating upon the output of the measurement means to separate selected spatial-frequency components to provide operating signals to control devices based upon selected spatial-frequencies to control the measured property of the sheet in the machine direction.
Claim 28
Independent Claim
87 words
A system for controlling sheet properties during production of sheets on sheetprocessing machines, comprising: measurement means for providing measurements of at least one property of a sheet during production, which measurements are made at a plurality of machine-directional locations along the same slice location on a sheet; spatial-frequency splitting means for operating upon the output of the measurement means to separate selected spatial-frequency components to provide operating signals to control devices based upon selected spatial-frequencies to control the measured property of the sheet in the machine direction.
Claim 29
Dependent Claim
19 words
A system according to Claim 23 wherein the spatial-frequency splitting means separates high spatial-frequencies from low spatial-frequencies by convolution.
References Cited (Backward Citations)
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