US4184080A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ratiometric edge detector system
Assignee: Molins Machine Co Inc
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Filing: 1977-06-30
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Granted: 1980-01-15
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Expires: 1997-06-30
Abstract
Abstract A ratiometric edge detector system for use in controlling the position of the edge of a web or other material. At least two zones on the web are illuminated with light. The first zone is of greater area than the second zone. The second zone has a border at the web edge. Light reflected from the two zones is optically sensed. A control signal is generated proportional to the ratio of the light reflected from the two zones. The ratio indicates deviation of the web edge from a preselected position.
Inventors
- 👤 William A. Massey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:06
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/26; G01D5/32; G01D5/34; G01D5/342; G01B; G01B11/00; G01B11/02; G01B11/028; G05; G05D; G05D3/00; G05D3/12; G05D3/14; G05D3/1409
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
97 words
A ratiometric edge detector system for use in controlling the position of the edge of a web, comprising: first means for illuminating first and second zones on a web, said first zone being of a greater area than said second zone and said second zone having as a border an edge of the web, second means for optically sensing light reflected from said first and second zones on said web, and third means operatively connected to said second means for generating a control signal proportional to the ratio of light reflected from said first and second zones.
Claim 2
Dependent Claim
97 words
A ratiometric edge detector system for use in controlling the position of the edge of a web, comprising: first means for illuminating first and second zones on a web, said first zone being of a greater area than said second zone and said second zone having as a border an edge of the web, second means for optically sensing light reflected from said first and second zones on said web, and third means operatively connected to said second means for generating a control signal proportional to the ratio of light reflected from said first and second zones.
Claim 3
Dependent Claim
31 words
The ratiometric edge detector system according to claim 1 including means for maintaining said control signal substantially constant regardless of the distance of said first and second means from said web.
Claim 4
Dependent Claim
38 words
The ratiometric edge detector system according to claim 1 wherein said first means includes at least two light sources, means for modulating the intensity of each of said light sources, and means for alternately exciting the light sources.
Claim 5
Dependent Claim
64 words
The ratiometric edge detector system according to claim 1 wherein said first means includes at least two light sources, means for modulating the intensity of one of said light sources at a first pulse repetition frequency, and means for modulating the intensity of the other of said light sources at a second pulse repetition frequency, said first and second pulse repetition frequencies being different.
Claim 6
Dependent Claim
18 words
The ratiometric edge detector system according to claim 1 wherein said second means includes at least two photodetectors.
Claim 7
Independent Claim
77 words
A method of detecting the position of the edge of a web, comprising: illuminating first and second zones on a web, said first zone being of greater area than said second zone and said second zone having as a border an edge of the web, optically sensing the light reflected from said first and second zones on said web, and generating a control signal proportional to the ratio of light reflected from said first and second zones.
Claim 8
Independent Claim
77 words
A method of detecting the position of the edge of a web, comprising: illuminating first and second zones on a web, said first zone being of greater area than said second zone and said second zone having as a border an edge of the web, optically sensing the light reflected from said first and second zones on said web, and generating a control signal proportional to the ratio of light reflected from said first and second zones.
Claim 9
Dependent Claim
127 words
An ratiometric edge detector system for use in controlling the position of the edge of a web, comprising: first means for alternately generating at least first and second light beams incident on the web, said first light beam being incident on a first zone of said web and said second light beam being incident on a second zone of said web, said first zone being of greater area than said second zone, said second zone having as a border an edge of said web. second means for optically sensing the light reflected from said first and second zones on said web, third means operatively connected to said second means for generating a control signal proportional to the ratio of light reflected from said first and second zones.
Claim 10
Dependent Claim
127 words
An ratiometric edge detector system for use in controlling the position of the edge of a web, comprising: first means for alternately generating at least first and second light beams incident on the web, said first light beam being incident on a first zone of said web and said second light beam being incident on a second zone of said web, said first zone being of greater area than said second zone, said second zone having as a border an edge of said web. second means for optically sensing the light reflected from said first and second zones on said web, third means operatively connected to said second means for generating a control signal proportional to the ratio of light reflected from said first and second zones.
Claim 11
Dependent Claim
38 words
The ratiometric edge detector system according to claim 7 wherein said first means includes at least two light sources, means for modulating the intensity of each of said light sources, and means for alternately exciting the light sources.
Claim 12
Dependent Claim
48 words
The ratiometric edge detector system according to claim 8 wherein said third means includes means for generating a time division multiplex signal having an envelope proportional to the light reflected from said first and second zones on said web, and means for de-multiplexing said time division multiplexed signal.
Claim 13
Dependent Claim
31 words
The ratiometric edge detector system according to claim 7 including means for maintaining said control signal substantially constant regardless of the distance of said first and second means from said web.
Claim 14
Dependent Claim
30 words
The ratiometric edge detector system according to claim 9 including means for indicating that the average of the envelope of said timed division multiplexed signal is below a pre-selected threshold.
Claim 15
Dependent Claim
137 words
A ratiometric edge detector system for use in controlling the position of the edge of a web comprising: first means for simultaneously generating at least first and second modulated light beams incident on a web, said first light beam being incident on a first zone of said web at a first modulation frequency, said second light beam being incident on a second zone of said web at a second modulation frequency, said first zone being of greater area than said second zone, said second zone having as a border an edge of said web, second means for optically sensing light reflected from said first and second zones on said web, third means operatively connected to said second means for generating a control signal proportional to the ratio of the light reflected from said first and second zones.
Claim 16
Dependent Claim
137 words
A ratiometric edge detector system for use in controlling the position of the edge of a web comprising: first means for simultaneously generating at least first and second modulated light beams incident on a web, said first light beam being incident on a first zone of said web at a first modulation frequency, said second light beam being incident on a second zone of said web at a second modulation frequency, said first zone being of greater area than said second zone, said second zone having as a border an edge of said web, second means for optically sensing light reflected from said first and second zones on said web, third means operatively connected to said second means for generating a control signal proportional to the ratio of the light reflected from said first and second zones.
Claim 17
Dependent Claim
31 words
The ratiometric edge detector system according to claim 12 including means for maintaining said control signal substantially constant regardless of the distance of said first and second means from said web.
Claim 18
Independent Claim
108 words
A method of detecting the position of the edge of a web, comprising: alternately generating at least first and second light beams incident on a web, said first light beam being incident on a first zone of said web and said second light beam being incident on a second zone of said web, said first zone being of greater area than said second zone, said second zone having as a border an edge of said web, optically sensing the light reflected from said first and second zones on said web, and generating a control signal proportional to the ratio of light reflected from said first and second zones.
Claim 19
Independent Claim
108 words
A method of detecting the position of the edge of a web, comprising: alternately generating at least first and second light beams incident on a web, said first light beam being incident on a first zone of said web and said second light beam being incident on a second zone of said web, said first zone being of greater area than said second zone, said second zone having as a border an edge of said web, optically sensing the light reflected from said first and second zones on said web, and generating a control signal proportional to the ratio of light reflected from said first and second zones.
Claim 20
Independent Claim
118 words
A method of detecting the position of the edge of a web, comprising: generating simultaneously at least first and second modulated light beams incident on a web, said first light beam being incident on a first zone of said web at a first modulation frequency, said second light beam being incident on a second zone of said web at a second modulation frequency, said first zone being of greater area than said second zone, said second zone having as a border an edge of said web, optically sensing light reflected from said first and second zones on said web, and generating a control signal proportional to the ratio of the light reflected from said first and second zones.
Claim 21
Independent Claim
118 words
A method of detecting the position of the edge of a web, comprising: generating simultaneously at least first and second modulated light beams incident on a web, said first light beam being incident on a first zone of said web at a first modulation frequency, said second light beam being incident on a second zone of said web at a second modulation frequency, said first zone being of greater area than said second zone, said second zone having as a border an edge of said web, optically sensing light reflected from said first and second zones on said web, and generating a control signal proportional to the ratio of the light reflected from said first and second zones.
Claim 22
Dependent Claim
102 words
A ratiometric edge detector system for use in controlling the position of the edge of a web, comprising: first means for illuminating first and second zones on a web, said first zone being of greater area than said second zone and said second zone having as a border an edge of the web, at least first and second photodetectors for optically sensing light reflected from said first and second zones on said web, and third means operatively connected to said first and second photodetectors for generating a control signal proportional to the ratio of light reflected from said first and second zones.
Claim 23
Dependent Claim
102 words
A ratiometric edge detector system for use in controlling the position of the edge of a web, comprising: first means for illuminating first and second zones on a web, said first zone being of greater area than said second zone and said second zone having as a border an edge of the web, at least first and second photodetectors for optically sensing light reflected from said first and second zones on said web, and third means operatively connected to said first and second photodetectors for generating a control signal proportional to the ratio of light reflected from said first and second zones.
Claim 24
Dependent Claim
35 words
The ratiometric edge detector system according to claim 16 including means for maintaining said control signal substantially constant regardless of the distance of said first means and said first and second photodetectors from said web.
Claim 25
Independent Claim
81 words
A method of detecting the position of the edge of a web, comprising: illuminating first and second zones on a web, said first zone being of greater area than said second zone and said second zone having as a border an edge of the web, optically sensing the light reflected from said first and second zones on said web at the same time, and generating a control signal proportional to the ratio of light reflected from said first and second zones.
Claim 26
Independent Claim
81 words
A method of detecting the position of the edge of a web, comprising: illuminating first and second zones on a web, said first zone being of greater area than said second zone and said second zone having as a border an edge of the web, optically sensing the light reflected from said first and second zones on said web at the same time, and generating a control signal proportional to the ratio of light reflected from said first and second zones.
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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) | 1983-01-14 | 1983-07-16 | 1984-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-14 | 1987-07-16 | 1988-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-14 | 1991-07-16 | 1992-01-15 | $7700.00 | Window Closed / Lapsed |