Patent US2576043A successfully refreshed from Google Patents.
US3738504A
Expired / Lapsed
US
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Back gauge position feed back signal generation
Assignee: Boeing North American Inc
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Filing: 1971-11-22
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Granted: 1973-06-12
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Expires: 1991-11-22
Abstract
Abstract Apparatus is provided for generating position signals useful and particularly advantageous as feedback inputs to a servo control system for a paper cutting machine movable back gauge assembly. The generated feedback signals provide binary-coded position information associated only with key control positions established at selected intervals in the back gauge total traverse and pulsed counting information for incremental position changes in each interval between the key control positions.
Inventors
- 👤 R Vail
- 👤 J Widmont
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:38
CPC Classifications
B; B26; B26D; B26D7/00; B26D7/01; B26D7/015; B26D7/016; G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/19; G05B19/39; Y; Y10; Y10T; Y10T83/00; Y10T83/444; Y10T83/463; Y10T83/4635; Y10T83/748; Y10T83/7593; Y10T83/7647
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
310 words
In a paper cutting machine having a back gauge and a reversible lead screw for driving said back gauge to select positions in a total range of longitudinal traverse, closed loop servo control system feedback signal generator apparatus comprising, in combination: rotatable input shaft means coupled to said paper cutting machine lead screw in driven relation, a first transparent marking disc means fixedly secure to said input shaft means for rotation in a plane normal to the rotational axis of said shaft means, said first transparent marking disc means having circumferentially spaced apart opaque markings with uniformly spaced apart edges which each correlate to an equal incremental change in the position of said back gauge, a second transparent marking disc means mounted freely on said input shaft means at a position axially adjacent said first transparent marking disc means, said second transparent marking disc means having circumferentially spaced-apart opaqUe binary-code patterns which each correlate to a different key control position in the total range of longitudinal position in the toal range of longitudinal traverse of said back gauge, gear train means coupling said second transparent marking disc means in driven and reduced rotation relation relative to said first transparent marking disc means, lamp means positioned at one side of said first and second transparent marking disc means, and a pair of photoelectric detector device arrays positioned at the other side of said first and second transparent marking disc means and in illuminated relation relative to said lamp means, one of said arrays producing binary-code signals correlated to key control positions of said paper cutting machine back gauge in said total range of longitudinal traverse, and the other of said arrays producing pulsed signals correlated to incremental changes in the position of said paper cutting machine back gauge in longitudinal traverse intervals intermediate adjacent of said back gauge key control positions.
Claim 2
Dependent Claim
310 words
In a paper cutting machine having a back gauge and a reversible lead screw for driving said back gauge to select positions in a total range of longitudinal traverse, closed loop servo control system feedback signal generator apparatus comprising, in combination: rotatable input shaft means coupled to said paper cutting machine lead screw in driven relation, a first transparent marking disc means fixedly secure to said input shaft means for rotation in a plane normal to the rotational axis of said shaft means, said first transparent marking disc means having circumferentially spaced apart opaque markings with uniformly spaced apart edges which each correlate to an equal incremental change in the position of said back gauge, a second transparent marking disc means mounted freely on said input shaft means at a position axially adjacent said first transparent marking disc means, said second transparent marking disc means having circumferentially spaced-apart opaqUe binary-code patterns which each correlate to a different key control position in the total range of longitudinal position in the toal range of longitudinal traverse of said back gauge, gear train means coupling said second transparent marking disc means in driven and reduced rotation relation relative to said first transparent marking disc means, lamp means positioned at one side of said first and second transparent marking disc means, and a pair of photoelectric detector device arrays positioned at the other side of said first and second transparent marking disc means and in illuminated relation relative to said lamp means, one of said arrays producing binary-code signals correlated to key control positions of said paper cutting machine back gauge in said total range of longitudinal traverse, and the other of said arrays producing pulsed signals correlated to incremental changes in the position of said paper cutting machine back gauge in longitudinal traverse intervals intermediate adjacent of said back gauge key control positions.
Claim 3
Dependent Claim
81 words
The invention defined by claim 1, wherein each of said transparent marking disc means opaque binary-code patterns has a strobing opaque area positioned a radial distance from said input shaft means, said strobing opaque area cooperating with a photoelectric light detector device in one of said light detector arrays to source a first strobing pulse correlated to a different one of each of said key control positions in the total range of longitudinal traverse of said paper cutting machine back gauge.
Claim 4
Dependent Claim
73 words
The invention defined by claim 1, wherein said first transparent marking disc means has a single strobing opaque area positioned a radial distance from said input shaft means, said single strobing opaque area cooperating with a photoelectric light detector device in one of said light detector arrays to source a strobing pulse correlated to one precise position in a complete revolution of said first transparent marking disc means and said input shaft means.
Claim 5
Dependent Claim
101 words
The invention defined by claim 2, wherein said first transparent marking disc means has a single strobing opaque area positioned a given radial distance from said input shaft means, said single strobing opaque area cooperating with a photoelectric light detector device in one of said light detector arrays to source a second strobing pulse correlated to one position in a complete revolution of said first transparent marking disc means said apparatus further comprising means conducting said first and second strobing pulses to circuit means generating a control pulse whenever said first and second strobing pulses are coincident on a time basis.
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) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |