Patent US3137981A successfully refreshed from Google Patents.
Patent US3586259A successfully refreshed from Google Patents.
US3586259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drive assembly for magnetic tape recorder
Assignee: Suddeutsche Mechanische Werkstatten Wolf Freiherr Von Hornstein KG
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Filing: 1969-07-07
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Granted: 1971-06-22
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Expires: 1989-07-07
Abstract
Abstract In a drive assembly for magnetic tape recorder a separate motor is associated with each of the reels. The motors are reversible so that the tape can be driven bidirectionally. An automatic control system maintains the constancy of the tape motion at any speed by monitoring the actual tape speed and comparing it with the nominal value thereof. Upon detection of a difference between the two data a servo loop is actuated to correct the deviation of the actual from the nominal speed. Adequate tension of the tape is maintained at all times.
Inventors
- 👤 Hubert Richt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:20
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/46; G11B15/50; G11B15/22; G11B15/48; G11B15/54; G11B27/00; G11B27/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
177 words
A drive assembly for a magnetic tape recorder comprising a pair of motors each having a drive shaft, a power source for driving said motors, means for selectively driving said drive shaft at different speeds, means for regulating the speed of either of said drive shafts, reversing switch means for changing the direction of motion of said drive shafts, a reel operatively connected with each of said drive shafts and rotatable therewith, a tape wound on and extending between said reels, means for winding said tape upon one of said reels at a predetermined speed and simultaneously unwinding said tape from the other of said reels, means for measuring the actual speed of said tape advanced by said reels, means for converting said measurements into signals, means for correlating said signals with stored signals representative of the nominal speed corresponding to at least one of said predetermined tape speeds, and an automatic control system for correcting drift of the actual tape speed relative to the nominal tape speed whereby constancy of motion of said tape is obtained.
Claim 2
Dependent Claim
177 words
A drive assembly for a magnetic tape recorder comprising a pair of motors each having a drive shaft, a power source for driving said motors, means for selectively driving said drive shaft at different speeds, means for regulating the speed of either of said drive shafts, reversing switch means for changing the direction of motion of said drive shafts, a reel operatively connected with each of said drive shafts and rotatable therewith, a tape wound on and extending between said reels, means for winding said tape upon one of said reels at a predetermined speed and simultaneously unwinding said tape from the other of said reels, means for measuring the actual speed of said tape advanced by said reels, means for converting said measurements into signals, means for correlating said signals with stored signals representative of the nominal speed corresponding to at least one of said predetermined tape speeds, and an automatic control system for correcting drift of the actual tape speed relative to the nominal tape speed whereby constancy of motion of said tape is obtained.
Claim 3
Dependent Claim
15 words
A drive assembly as defined in claim 1 wherein said motors are external rotor-type motors.
Claim 4
Dependent Claim
17 words
A drive assembly as defined in claim 2 wherein said motors are deep-bar squirrel cage rotor-type motors.
Claim 5
Dependent Claim
35 words
A drive assembly as defined in claim 2 comprising a spool support for each of said reels and a coupling coaxially mounted on each of said motor rotors connecting said motors and said spool supports.
Claim 6
Dependent Claim
57 words
A drive assembly as defined in claim 1 wherein said speed measuring means comprise at least one roller rotating at an angular speed proportional to the linear speed of said tape, at least one marking applied to the circumference of said roller, and a counter registering the number of revolutions of said roller per unit of time.
Claim 7
Dependent Claim
33 words
A drive assembly as defined in claim 5 wherein said marking is a serration formed from ferromagnetic material and said registering counter comprises a polarized magnet proximate to said roller having said marking.
Claim 8
Dependent Claim
22 words
A drive assembly as defined in claim 5 wherein said marking is a line and said registering counter comprises a photoelectric cell.
Claim 9
Dependent Claim
29 words
A drive assembly as defined in claim 7 comprising means for correlating the number of revolutions of said roller with a number representative of the length of the tape.
Claim 10
Dependent Claim
89 words
A drive assembly as defined in claim 1 comprising a single automatic control system for regulating the speed of said motor in either direction of motion, a single voltage source for producing a counter torque in either of said motors, means connecting said automatic control system and said voltage source with either of said motors, and means for switching said automatic control system and said voltage source from one of said motors to the other of said motors during a reversal of the direction of motion of said motors.
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) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |