Patent US3775567A successfully refreshed from Google Patents.
US3775567A
Expired / Lapsed
US
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Apparatus and method for selectively providing for circumferential shifting of rotary magnetic heads
Assignee: JM Huber Corp
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Filing: 1971-01-28
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Granted: 1973-11-27
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Expires: 1991-01-28
Abstract
Abstract Apparatus and method for compensating for the stretching or shrinking of a magnetic tape used with a tape transport of the type having one or more heads mounted on a rotor for rotation about a central axis. The heads are adapted for movement in scanning relationship to the magnetic tape when the latter is disposed adjacent to and movable along at least a portion of the arcuate path of travel of the heads. The heads are shiftably coupled to the rotor to permit movement of the heads circumferentially of the path of travel of the rotor and the heads are shifted lengthwise of the tape to compensate for head position errors due to changes in the length of the tape caused by shrinkage or stretching.
Inventors
- 👤 G Bruck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:20
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/52; G11B5/53; G11B5/531; G11B15/00; G11B15/18; G11B15/1808
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
111 words
In a tape transport system: a rotor having a central axis; means coupled with the rotor for rotating the same about said central axis; a plurality of heads adapted to scan a magnetic tape; means mounting the heads on the rotor for rotation therewith about said central axis and for rotation relative thereto about respective axes substantially parallel to said central axis to permit circumferential movement of the heads relative to the rotor as the latter rotates about said central axis; and means coupled with said head mounting means for moving each head in one direction relative to said rotor during a portion of each revolution thereof about said central axis.
Claim 2
Dependent Claim
111 words
In a tape transport system: a rotor having a central axis; means coupled with the rotor for rotating the same about said central axis; a plurality of heads adapted to scan a magnetic tape; means mounting the heads on the rotor for rotation therewith about said central axis and for rotation relative thereto about respective axes substantially parallel to said central axis to permit circumferential movement of the heads relative to the rotor as the latter rotates about said central axis; and means coupled with said head mounting means for moving each head in one direction relative to said rotor during a portion of each revolution thereof about said central axis.
Claim 3
Dependent Claim
92 words
In a tape transport system: a rotor; means mounting the rotor for rotation about a central axis; means coupled with the rotor for rotating the same; a head; means mounting the head on the rotor for movement relative thereto about an axis parallel to said central axis and circumferentially of the path of travel of the rotor; and cam means coupled with the head mounting means for moving the same in said direction relative to said rotor as the latter rotates during only a portion of each revolution thereof about said axis.
Claim 4
Dependent Claim
92 words
In a tape transport system: a rotor; means mounting the rotor for rotation about a central axis; means coupled with the rotor for rotating the same; a head; means mounting the head on the rotor for movement relative thereto about an axis parallel to said central axis and circumferentially of the path of travel of the rotor; and cam means coupled with the head mounting means for moving the same in said direction relative to said rotor as the latter rotates during only a portion of each revolution thereof about said axis.
Claim 5
Dependent Claim
161 words
In a tape transport system: a rotor having a central axis and adapted to be mounted for rotation about said central axis; a magnetic tape; means coupled with said tape for positioning a stretch of the tape in conformity with a portion of the circular path of travel of the outer extermity of the rotor; a plurality of heads; means shiftably mounting each head, respectively, on said rotor at a location spaced from the other heads with each head being disposed to scan said tape stretch as the rotor rotates about said axis, said heads being rotatable independently of each other and relative to the rotor in opposed directions about respective axes substantially parallel to said central axis, so that said heads can move circumferentially of said arcuate path of travel; and cam means coupled with said head mounting means and responsive to the angular position of the rotor for moving each head about its respective axis relative to the rotor.
Claim 6
Dependent Claim
161 words
In a tape transport system: a rotor having a central axis and adapted to be mounted for rotation about said central axis; a magnetic tape; means coupled with said tape for positioning a stretch of the tape in conformity with a portion of the circular path of travel of the outer extermity of the rotor; a plurality of heads; means shiftably mounting each head, respectively, on said rotor at a location spaced from the other heads with each head being disposed to scan said tape stretch as the rotor rotates about said axis, said heads being rotatable independently of each other and relative to the rotor in opposed directions about respective axes substantially parallel to said central axis, so that said heads can move circumferentially of said arcuate path of travel; and cam means coupled with said head mounting means and responsive to the angular position of the rotor for moving each head about its respective axis relative to the rotor.
Claim 7
Dependent Claim
98 words
In a tape transport system: a rotor having an outer extremity; means mounting the rotor for rotation about a central axis; means coupled with the rotor for rotating the same about said central axis; a head; means mounting the head on the rotor adjacent to said outer periphery for rotation relative thereto circumferentially thereof about an axis substantially parallel to said central axis and spaced inwardly from said outer periphery; and means coupled with the head mounting means and responsive to the angular position of the rotor for moving the head relative to and circumferentially of the rotor.
Claim 8
Dependent Claim
98 words
In a tape transport system: a rotor having an outer extremity; means mounting the rotor for rotation about a central axis; means coupled with the rotor for rotating the same about said central axis; a head; means mounting the head on the rotor adjacent to said outer periphery for rotation relative thereto circumferentially thereof about an axis substantially parallel to said central axis and spaced inwardly from said outer periphery; and means coupled with the head mounting means and responsive to the angular position of the rotor for moving the head relative to and circumferentially of the rotor.
Claim 9
Dependent Claim
59 words
In a tape transport system as set forth in claim 4, wherein said moving means includes a cam having a continuous cam surface, said mounting means including an arm shiftably mounted on the rotor and normally engaging said cam surface to cause movement of the head as a function of the position of the rotor relative to the cam.
Claim 10
Dependent Claim
52 words
In a tape transport system as set forth in claim 5, wherein said arm has a pair of opposed ends, said head being secured to one end of the arm, and including a roller at the opposite end of the arm, and means biasing said roller into engagement with said cam surface.
Claim 11
Dependent Claim
27 words
In a tape transport system as set forth in claim 5, wherein is included means coupled with said cam for shifting the same relative to said rotor.
Claim 12
Independent Claim
150 words
A metHod for compensating for dimensional changes in a tape having record tracks thereon and forming a part of a tape transport system of the type having a rotor rotatable about a central axis and a transducer carried by the rotor and rotatable thereon about an axis parallel to said central axis comprising: rotating the rotor and the transducer about said central axis; moving the tape in one direction along at least a portion of the path of travel of the rotor and the transducer as the latter rotate whereby the transducer can scan a record track on the tape; and rotating the transducer in one direction about said parallel axis to change the rotational speed of the transducer relative to the tape only when the transducer is adjacent thereto with the speed change being sufficient to maintain the transducer in scanning relationship to a record track on the tape.
Claim 13
Independent Claim
150 words
A metHod for compensating for dimensional changes in a tape having record tracks thereon and forming a part of a tape transport system of the type having a rotor rotatable about a central axis and a transducer carried by the rotor and rotatable thereon about an axis parallel to said central axis comprising: rotating the rotor and the transducer about said central axis; moving the tape in one direction along at least a portion of the path of travel of the rotor and the transducer as the latter rotate whereby the transducer can scan a record track on the tape; and rotating the transducer in one direction about said parallel axis to change the rotational speed of the transducer relative to the tape only when the transducer is adjacent thereto with the speed change being sufficient to maintain the transducer in scanning relationship to a record track on the tape.
Claim 14
Independent Claim
156 words
A method for compensating for dimensional changes in a magnetic tape having a number of record tracks thereon and defining a part of a tape transport system of the type having a rotor rotatable about a central axis and a number of spaced heads carried by the rotor and rotatable thereon about respective axes parallel to said central axis comprising: rotating said rotor about said central axis; moving the tape along a portion of the path of travel of the rotor and the heads as the latter rotate, whereby the heads can successively scan the record tracks on the tape; and rotating each head in one direction about its respective axis to change the speed of the head relative to the tape and independently of the other heads only while the head scans the tape with the speed change being sufficient to maintain the head in scanning relationship to the adjacent record track of the tape.
Claim 15
Independent Claim
156 words
A method for compensating for dimensional changes in a magnetic tape having a number of record tracks thereon and defining a part of a tape transport system of the type having a rotor rotatable about a central axis and a number of spaced heads carried by the rotor and rotatable thereon about respective axes parallel to said central axis comprising: rotating said rotor about said central axis; moving the tape along a portion of the path of travel of the rotor and the heads as the latter rotate, whereby the heads can successively scan the record tracks on the tape; and rotating each head in one direction about its respective axis to change the speed of the head relative to the tape and independently of the other heads only while the head scans the tape with the speed change being sufficient to maintain the head in scanning relationship to the adjacent record track of the tape.
Claim 16
Dependent Claim
34 words
A method as set forth in claim 9, wherein said changing step includes moving each head circumferentially of said head path as a function of the arcuate position of the head along said path.
Claim 17
Dependent Claim
24 words
A method as set forth in claim 9, wherein said changing step includes rotating said head about an axis parallel with said central axis.
References Cited (Backward Citations)
US3029318A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |