US3779482A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording and reproducing apparatus
Assignee: Sony Corp
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Filing: 1972-05-26
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Granted: 1973-12-18
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Expires: 1992-05-26
Abstract
Abstract An apparatus for recording and/or reproducing signals on a magnetic tape which is wound on supply and take-up reels, preferably within a cassette, and which has a tape drive for transferring the tape from one to the other of the reels during recording, reproducing and other operations of the apparatus, is provided with a tape tension detecting element moved in response to a change in tape tension from a predetermined value or norm, as upon the full unwinding of the tape from one of the reels, for initiating operation of a shut-off device by the tape drive, and such shut-off device provides a shut-off force for halting operation of the tape drive only if the detected change in tape tension from the norm continues for a predetermined period or time delay after initiation of the operation of the shut-off device, whereby to ensure that the tape drive operation will not be halted in response to merely a transitory or temporary change in tape tension.
Inventors
- 👤 T Chimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:05
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/02; G11B15/16; G11B15/18; G11B15/22
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
141 words
An apparatus for recording and/or reproducing signals on a magnetic tape, comprising tape drive means for driving the tape during operation of the apparatus, tape tension detecting means engageable with the tape for operation in response to a change in the tape tension from a predetermined norm, shut-off drive means engaged with said tape drive means in response to said operation of the tape tension detecting means for operating said shut-off drive means from said tape drive means, means for maintaining the engagement of said shut-off drive means with said tape drive means, and thereby continuing the operation of said shut-off drive means for providing a shut-off force, when said operation of said tape tension detecting means continues for a predetermined period following the initiating thereof, and means actuated by said shut-off force for halting operation of said tape drive means.
Claim 2
Independent Claim
141 words
An apparatus for recording and/or reproducing signals on a magnetic tape, comprising tape drive means for driving the tape during operation of the apparatus, tape tension detecting means engageable with the tape for operation in response to a change in the tape tension from a predetermined norm, shut-off drive means engaged with said tape drive means in response to said operation of the tape tension detecting means for operating said shut-off drive means from said tape drive means, means for maintaining the engagement of said shut-off drive means with said tape drive means, and thereby continuing the operation of said shut-off drive means for providing a shut-off force, when said operation of said tape tension detecting means continues for a predetermined period following the initiating thereof, and means actuated by said shut-off force for halting operation of said tape drive means.
Claim 3
Independent Claim
183 words
An apparatus for recording and/or reproducing signals on a magnetic tape which is wound on supply and take-up reels, comprising tape drive means operative for transferring the tape from one to the other of said reels during operation of the apparatus, tape tension detecting means engageable with the tape between said reels for operation in response to a change in the tape tension from a predetermined norm, shut-off drive means normally disengaged from said tape drive means and being engaged with the latter in response to said operation of the tape tension detecting means for causing operation of said shut-off drive means by said drive means, means for maintaining the engagement of said shut-off drive means with said tape drive means, and thereby continuing the operation of said shut-off drive means for providing a shut-off force, when said operation of said tape tension detecting means continues for a predetermined period after the initiation thereof in response to the full unwinding of the tape from one of said reels, and means actuated by said shut-off force for halting operation of said tape drive means.
Claim 4
Independent Claim
183 words
An apparatus for recording and/or reproducing signals on a magnetic tape which is wound on supply and take-up reels, comprising tape drive means operative for transferring the tape from one to the other of said reels during operation of the apparatus, tape tension detecting means engageable with the tape between said reels for operation in response to a change in the tape tension from a predetermined norm, shut-off drive means normally disengaged from said tape drive means and being engaged with the latter in response to said operation of the tape tension detecting means for causing operation of said shut-off drive means by said drive means, means for maintaining the engagement of said shut-off drive means with said tape drive means, and thereby continuing the operation of said shut-off drive means for providing a shut-off force, when said operation of said tape tension detecting means continues for a predetermined period after the initiation thereof in response to the full unwinding of the tape from one of said reels, and means actuated by said shut-off force for halting operation of said tape drive means.
Claim 5
Independent Claim
252 words
An apparatus for recording and/or reproducing signals on a magnetic tape which is wound on supply and take-up reels, comprising tape drive means operative for transferring the tape from one to the other of said reels during operation of the apparatus, tape tension detecting means engageable with the tape between said reels for operation in response to a change in the tape tension from a predetermined norm, shut-off drive means, support means carrying said shut-off drive means and being movable between a normal position, where said shut-off drive means is free of said tape drive means, and a displaced position to which said support means is moved by said tape tension detecting means upon said operation of the latter and where said shut-off drive means engages said tape drive means and is driven by the latter, an abutment member on said shut-off drive means urged in one direction to an initial position relative to said support means and being movable in the opposite direction from said initial position in response to driving of said shut-off drive means, and a shut-off control member spaced from said abutment member in said initial position of the latter and being actuable by said abutment member for halting operation of said tape drive means only upon movement of said abutment member a predetermined distance in said opposite direction from said initial position in response to operation of said tension detecting means for a predetermined period upon the full unwinding of the tape from one of said reels.
Claim 6
Independent Claim
252 words
An apparatus for recording and/or reproducing signals on a magnetic tape which is wound on supply and take-up reels, comprising tape drive means operative for transferring the tape from one to the other of said reels during operation of the apparatus, tape tension detecting means engageable with the tape between said reels for operation in response to a change in the tape tension from a predetermined norm, shut-off drive means, support means carrying said shut-off drive means and being movable between a normal position, where said shut-off drive means is free of said tape drive means, and a displaced position to which said support means is moved by said tape tension detecting means upon said operation of the latter and where said shut-off drive means engages said tape drive means and is driven by the latter, an abutment member on said shut-off drive means urged in one direction to an initial position relative to said support means and being movable in the opposite direction from said initial position in response to driving of said shut-off drive means, and a shut-off control member spaced from said abutment member in said initial position of the latter and being actuable by said abutment member for halting operation of said tape drive means only upon movement of said abutment member a predetermined distance in said opposite direction from said initial position in response to operation of said tension detecting means for a predetermined period upon the full unwinding of the tape from one of said reels.
Claim 7
Dependent Claim
66 words
An apparatus according to claim 3; in which said support means is mounted for movement about a pivot axis between said normal and displaced positions, said abutment member acts on said shut-off control member at a disTance from said pivot axis for providing a reactive force which maintains said support means at said displaced position for so long as said tape drive means continues to operate.
Claim 8
Dependent Claim
56 words
An apparatus according to claim 3; in which said tape drive means includes a rotated drive gear, and said shut-off drive means includes a gear mechanism having an input gear member for meshing engagement with said drive gear in said displaced position of the support means and an output gear member having said abutment member thereon.
Claim 9
Dependent Claim
61 words
An apparatus according to claim 5, in which said gear mechanism includes reduction gear means between said input and output gear members for delaying the movement of said abutment member from said initial position through said predetermined distance prior to actuation of said shut-off control member and for relatively increasing the force available for said actuation from said tape drive means.
Claim 10
Dependent Claim
72 words
An apparatus according to claim 3, in which there is a pivoted control lever movable between extreme positions corresponding respectively to operative and inoperative conditions of said tape drive means, spring means urge said control lever to each of said extreme positions from a mid-point therebetween, and said shut-off control member, when actuated, displaces said control lever beyond said mid-point in the direction toward the extreme position corresponding to said inoperative condition.
Claim 11
Dependent Claim
70 words
An apparatus according to claim 7; in which said tape drive means includes a capstan rotated upon operation of the tape drive means, a pinch roller movable toward and away from said capstan, and means moving said pinch roller against said capstan for driving the tape therebetween in response to the movement of said control lever to its extreme position corresponding to said operative condition of the tape drive means.
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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |