US3701494A
Expired / Lapsed
US
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Electropneumatically controlled servo for tape mechanism
Assignee: Honeywell Inc
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Filing: 1970-04-20
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Granted: 1972-10-31
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Expires: 1990-04-20
Abstract
Abstract An electropneumatic servo device for a tape drive mechanism including vacuum tape loop chambers, the differential pressures of which are sensed to develop signals which, in conjunction with a motor speed feed-back signal, are used to drive the reel motors of the tape drive.
Inventors
- 👤 George G Proulx
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:08
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/56; G11B15/58
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
122 words
A tape loop positioning system for a tape transport, comprising: a. a tape loop chamber provided with a vacuum source at a first end thereof and a source of atmospheric pressure at a second end thereof, b. manifold means adjacent to and communicating with said tape loop chamber, c. sensing means for sensing pressure in said manifold means, d. a magneto-resistive device connected to said sensing means for generating a first signal, e. driving means, f. signal generating means connected to said driving means for generating a second signal, g. summing means for summing said first and second signals, h. means responsive to said summing means for providing a third signal, and i. said third signal being applied to said driving means.
Claim 2
Dependent Claim
122 words
A tape loop positioning system for a tape transport, comprising: a. a tape loop chamber provided with a vacuum source at a first end thereof and a source of atmospheric pressure at a second end thereof, b. manifold means adjacent to and communicating with said tape loop chamber, c. sensing means for sensing pressure in said manifold means, d. a magneto-resistive device connected to said sensing means for generating a first signal, e. driving means, f. signal generating means connected to said driving means for generating a second signal, g. summing means for summing said first and second signals, h. means responsive to said summing means for providing a third signal, and i. said third signal being applied to said driving means.
Claim 3
Dependent Claim
20 words
A tape loop positioning system as set forth in claim 1 wherein said driving means drives a tape reel means.
Claim 4
Dependent Claim
79 words
A pneumatically pneumatically servo comprising: a. driving means driving a member, said driving means having an input, b. pneumatic means for sensing the position of said member, c. a magneto-resistive device to said sensing means for generating a first signal, d. means responsive to said driving means for generating a second signal, e. means responsive to said first and second signals for generating a third signal, and f. means for applying said third signal to said driving means input.
Claim 5
Dependent Claim
79 words
A pneumatically pneumatically servo comprising: a. driving means driving a member, said driving means having an input, b. pneumatic means for sensing the position of said member, c. a magneto-resistive device to said sensing means for generating a first signal, d. means responsive to said driving means for generating a second signal, e. means responsive to said first and second signals for generating a third signal, and f. means for applying said third signal to said driving means input.
Claim 6
Dependent Claim
22 words
A servo as set forth in claim 3 wherein said means responsive to said first and second signals is a summing means.
Claim 7
Dependent Claim
18 words
A pneumatically controlled servo as set forth in claim 3 wherein: said pneumatic means includes a diaphragm means.
Claim 8
Dependent Claim
38 words
A pneumatically controlled servo as set forth in claim 5 further comprising: a. a chamber in which said member is to be positioned, b. a manifolD connected to said chamber, c. said diaphragm means connected to said manifold.
Claim 9
Dependent Claim
36 words
A pneumatically controlled servo as set forth in claim 3 further comprising: a. diaphragm means forming part of said pneumatic means, and b. said diaphragm means connected to control said means for generating a first signal.
Claim 10
Dependent Claim
70 words
In a tape drive mechanism having a tape reel with a motor for driving said reel, means for actuating said motor comprising: a. means for generating a magneto-resistor first signal proportional to tape position, b. means for generating a second signal proportional to the speed of said motor, c. summing means for summing said first and second signals, and d. means responsive to said summing means for actuating said motor.
Claim 11
Dependent Claim
70 words
In a tape drive mechanism having a tape reel with a motor for driving said reel, means for actuating said motor comprising: a. means for generating a magneto-resistor first signal proportional to tape position, b. means for generating a second signal proportional to the speed of said motor, c. summing means for summing said first and second signals, and d. means responsive to said summing means for actuating said motor.
Claim 12
Dependent Claim
97 words
In a digital computer tape drive having a reel, reel driving means and tape loop chamber means for actuating said reel driving means comprising: a. tape loop sensing means providing a linear loop sensing signal proportional to the position of tape in said tape loop chamber, b. transducer means responsive to said loop sensing signal for generating a proportional linear first signal representative of said tape position, c. means responsive to the speed of said reel for generating a second signal, and d. means responsive to said first and second signals for actuating said reel driving means.
Claim 13
Dependent Claim
97 words
In a digital computer tape drive having a reel, reel driving means and tape loop chamber means for actuating said reel driving means comprising: a. tape loop sensing means providing a linear loop sensing signal proportional to the position of tape in said tape loop chamber, b. transducer means responsive to said loop sensing signal for generating a proportional linear first signal representative of said tape position, c. means responsive to the speed of said reel for generating a second signal, and d. means responsive to said first and second signals for actuating said reel driving means.
Claim 14
Dependent Claim
105 words
In a tape transport system having a driving motor, a servo system for maintaining a desired tape loop length in a vacuum chamber comprising: a. tape loop sensing means including a plurality of pressure sensing holes in said chamber; b. a pressure sensing switch responsive to pressure at any one of said sensing holes for generating a first signal proportional to said tape loop length; c. tachometer means for generating a second signal proportional to the speed of said motor; d. summing means responsive to the algebraic sum of said first and second signals; and, e. means responsive to summing means for actuating said motor.
Claim 15
Dependent Claim
105 words
In a tape transport system having a driving motor, a servo system for maintaining a desired tape loop length in a vacuum chamber comprising: a. tape loop sensing means including a plurality of pressure sensing holes in said chamber; b. a pressure sensing switch responsive to pressure at any one of said sensing holes for generating a first signal proportional to said tape loop length; c. tachometer means for generating a second signal proportional to the speed of said motor; d. summing means responsive to the algebraic sum of said first and second signals; and, e. means responsive to summing means for actuating said motor.
Claim 16
Dependent Claim
73 words
A system as defined in claim 10 wherein said vacuum chamber is provided with a vacuum source at a first end and an atmospheric pressure source at a second end, said plurality of pressure sensing holes is between said first and second ends and senses the differential pressure generated by said sources, and said pressure responsive switch is a diaphragm which has movements as a result of the changing of said differential pressure.
Claim 17
Dependent Claim
110 words
A tape transport system for providing tape storage from a reel to a vacuum chamber by means of tape loops comprising: a. tape loop sensing means for generating a differential pressure signal representative of the location of the tape loop, b. transducer means for generating a linear magnetic signal proportional to said differential pressure signal, c. semiconductor means responsive to said transducer magnetic signal and providing a linear first input signal, d. second signal means responsive to reel speed for providing a second input signal, and e. summing means for summing the algebraic sum of said first and second input signals for maintaining the tape loop in a predetermined position.
Claim 18
Dependent Claim
110 words
A tape transport system for providing tape storage from a reel to a vacuum chamber by means of tape loops comprising: a. tape loop sensing means for generating a differential pressure signal representative of the location of the tape loop, b. transducer means for generating a linear magnetic signal proportional to said differential pressure signal, c. semiconductor means responsive to said transducer magnetic signal and providing a linear first input signal, d. second signal means responsive to reel speed for providing a second input signal, and e. summing means for summing the algebraic sum of said first and second input signals for maintaining the tape loop in a predetermined position.
Claim 19
Dependent Claim
79 words
A system as defined in claim 12 and further comprising: a motor, a third signal means responsive to said summing means for generating a first output when said summing means is in a first state or a second output when said summing means is in a second state, first means responsive to said first output for actuating said motor in a first direction, and second means responsive to said second output for actuating said motor in a second direction.
Claim 20
Dependent Claim
27 words
A system as defined in claim 13 wherein said third signals means includes a differential amplifier, and said semi-conductor means includes at least one variable pressure resistor.
Claim 21
Dependent Claim
22 words
A mechanism as set forth in claim 4 wherein said first and second means are SCR''s of first and second polarity, respectively.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |