US3619626A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital edge position detector
Assignee: United States Steel Corp
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Filing: 1969-03-17
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Granted: 1971-11-09
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Expires: 1989-03-17
Abstract
Abstract An edge position detector includes a sequencing cylinder positioned on one side of a moving strip. The cylinder is rotated around its longitudinal axis and has a plurality of spaced apart radial holes through it, arranged in a helical pattern. Light from a light source passes through the holes in the cylinder and matching collimating holes. Where the resultant light pulses are not obscured by the strip, they pass through another set of matching collimating holes and impinge upon a photoelectric cell. The light pulses are converted into electrical pulses and counted during a given angular rotation of the cylinder to indicate the position of the edge of the strip as the number of holes beyond the edge of the strip during the counting period.
Inventors
- 👤 Ralph G Rudolph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:39
CPC Classifications
B; B65; B65H; B65H23/00; B65H23/02; B65H23/0204; B65H23/0216; G; G01; G01B; G01B11/00; G01B11/02; G01B11/04; G01B11/046; G01D; G01D5/00; G01D5/26; G01D5/32; G01D5/34; G01D5/342
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
230 words
Apparatus for detecting the position of the edge of a moving strip comprising a light source located on one side of the strip, a collimating block between the light source and said one side of the strip, a first and a second set of parallel matching spaced apart holes in said block with matching holes in axial alignment and located along a line transverse to the direction of travel of the strip, a rotatable cylinder, means for rotating said cylinder, an axial opening in said block between said first and second sets of holes adapted to receive said cylinder, a third set of spaced apart radial holes, each angularly displaced from each other in said cylinder and arranged sO that when the cylinder is rotated, light may pass from said source through said first set of holes, through said third set of holes one at a time and then through said second set of holes thereby providing repetitive groups of spaced apart light pulses as said cylinder rotates, means on the other side of said strip for receiving those light pulses which pass beyond the edge of the strip, means connected to said receiving means for converting said received light pulses into electrical pulses, and means connected to said converting means and said means for rotating said cylinder for counting said electrical pulses resulting from each group of light pulses.
Claim 2
Dependent Claim
230 words
Apparatus for detecting the position of the edge of a moving strip comprising a light source located on one side of the strip, a collimating block between the light source and said one side of the strip, a first and a second set of parallel matching spaced apart holes in said block with matching holes in axial alignment and located along a line transverse to the direction of travel of the strip, a rotatable cylinder, means for rotating said cylinder, an axial opening in said block between said first and second sets of holes adapted to receive said cylinder, a third set of spaced apart radial holes, each angularly displaced from each other in said cylinder and arranged sO that when the cylinder is rotated, light may pass from said source through said first set of holes, through said third set of holes one at a time and then through said second set of holes thereby providing repetitive groups of spaced apart light pulses as said cylinder rotates, means on the other side of said strip for receiving those light pulses which pass beyond the edge of the strip, means connected to said receiving means for converting said received light pulses into electrical pulses, and means connected to said converting means and said means for rotating said cylinder for counting said electrical pulses resulting from each group of light pulses.
Claim 3
Dependent Claim
81 words
Apparatus according to claim 1 in which said means for receiving light pulses includes a collimating bar located on the side of the strip opposite said light source, a fourth set of spaced apart holes in said collimating bar in axial alignment with the holes in the first and second sets, and photo electric cell means along the edge of the collimating bar away from the strip for receiving light pulses through the sets of holes and developing corresponding electrical signals.
Claim 4
Dependent Claim
100 words
Apparatus according to claim 2 in which said converting means comprises filter means connected to said photo cell means for filtering said electrical signals to remove certain high frequencies and certain low frequencies, an amplifier connected to said filter means, signal expander means connected to said amplifier for removing that portion of said electrical signals below a predetermined amplitude and for amplifying that portion of the electrical signals above said predetermined amplitude and for limiting the amplitude of said electrical signals, and pulse shaping means connected to said limiting means for developing an output of uniform amplitude and time duration.
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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) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |