US3666894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for the recording and playback of signals on magnetic tape
Assignee: Robert Bosch Fernsehanlagen GmbH
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Filing: 1971-01-19
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Granted: 1972-05-30
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Expires: 1991-01-19
Abstract
Abstract A head-wheel, carrying recording and pick-up heads for a magnetic tape recording and play-back system, is mounted on the rotor shaft of a drive motor, together with rotatable electric signal transfer means to constitute a rotor assembly which can be, as a unit, axially separated from the stator of the drive motor for the rotor assembly. The rotatable signal transfer means of the rotor are disposed in proximity of the head-wheel and have a stepped bearing dimension fitting into the supporting bearing of cooperating stationary signal transfer means of the stator.
Inventors
- 👤 Rudolf Prochnow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:17
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/52
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
357 words
A device for the recording and playback of signals on magnetic tape, comprising a motor having a stator structure supported on a base, and a rotor having a shaft operably and axially insertable and positionable concentrically into and within said stator structure, and axially shiftable for removal from said stator structure; said stator structure embodying a cylindrical winding structure disposed concentrically around a central axis of rotation of the motor; with an end bearing disposed and supported co-axially at each end of said stator structure to support the rotor shaft, one of said two bearings being located at the front end of said stator structure and having a larger open inner bearing diameter to permit the insertion of the rotor, and the other of said two bearings being located at the back end of said stator structure with an inner diameter to receive thE corresponding back end of the rotor shaft; said rotor shaft having a small stepped bearing at its back end to fit said back stator bearing, and the front end of the rotor shaft having a stepped bearing dimension appropriate to fit operably in said front end bearing of said stator structure; head wheel means mounted co-axially at the front end of said shaft and serving to carry a plurality of magnetic heads for engaging an external magnetic tape; and rotatable electric signal transfer means supported on a peripheral region of said rotor shaft to be rotated in a circular path concentric to said operating axis and to transfer signal energy between said rotatable signal transfer means and cooperating stationary signal transfer means supported on said stator structures; said rotatable signal transfer means being disposed in close proximity of said head-wheel means and having a stepped bearing dimension appropriate to fit operably in said front end bearing of said stationary signal transfer means; all of said rotor structure being thereby axially shiftable as a unit into working position into and between the bearings, to place the head-wheel in operative position, and said rotor structure being conversely removable as a unit by axial shifting from working position when the magnetic heads are to be replaced.
Claim 2
Independent Claim
357 words
A device for the recording and playback of signals on magnetic tape, comprising a motor having a stator structure supported on a base, and a rotor having a shaft operably and axially insertable and positionable concentrically into and within said stator structure, and axially shiftable for removal from said stator structure; said stator structure embodying a cylindrical winding structure disposed concentrically around a central axis of rotation of the motor; with an end bearing disposed and supported co-axially at each end of said stator structure to support the rotor shaft, one of said two bearings being located at the front end of said stator structure and having a larger open inner bearing diameter to permit the insertion of the rotor, and the other of said two bearings being located at the back end of said stator structure with an inner diameter to receive thE corresponding back end of the rotor shaft; said rotor shaft having a small stepped bearing at its back end to fit said back stator bearing, and the front end of the rotor shaft having a stepped bearing dimension appropriate to fit operably in said front end bearing of said stator structure; head wheel means mounted co-axially at the front end of said shaft and serving to carry a plurality of magnetic heads for engaging an external magnetic tape; and rotatable electric signal transfer means supported on a peripheral region of said rotor shaft to be rotated in a circular path concentric to said operating axis and to transfer signal energy between said rotatable signal transfer means and cooperating stationary signal transfer means supported on said stator structures; said rotatable signal transfer means being disposed in close proximity of said head-wheel means and having a stepped bearing dimension appropriate to fit operably in said front end bearing of said stationary signal transfer means; all of said rotor structure being thereby axially shiftable as a unit into working position into and between the bearings, to place the head-wheel in operative position, and said rotor structure being conversely removable as a unit by axial shifting from working position when the magnetic heads are to be replaced.
Claim 3
Dependent Claim
44 words
A device for recording and playback of signals, as in claim 1, in which said bearings support the rotor concentrically during operation to maintain a uniform cylindrical gap between the signal transfer means, on the rotor and the cooperating means on the stator structure.
Claim 4
Dependent Claim
39 words
A device for recording and playback of signals as in claim 1, in which said bearings on the stator structure are arranged to be operated as air bearings to air-support the rotor shaft in symmetrical co-axial position during operation.
Claim 5
Dependent Claim
35 words
A device for recording and playback of signals, as in claim 1, comprising further, means for imposing a co-axial restraint on the rotor shaft during operation, to keep the rotor assembly in proper operating position.
Claim 6
Dependent Claim
46 words
A device as in claim 4, in which said axial restraining means includes a pivoted cantilever swivel arm carrying a unitary ball bearing at its free end, with the ball located on the arm to be in co-axial alignment with the rotor shaft in operating positions.
References Cited (Backward Citations)
US3591732A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |