Ratiometric edge detector system
AssigneeMolins Machine Company, Inc.
InventorWilliam A. Massey
Life of this patent
Estimating the term…
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.
Claims18
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.
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.
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.
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.
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.
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.
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.
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.
Dependencies are inferred from the claim text.