Patent US4520411A successfully refreshed from Google Patents.
US4520411A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic tape recording device
Assignee: Sony Corp
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Filing: 1984-05-18
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Granted: 1985-05-28
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Expires: 2004-05-18
Abstract
Abstract A magnetic tape loading device comprises a head drum having magnetic heads, a drum base supporting the head drum, two loading rings supported on an upper surface of a chassis and rotatable in opposite directions, two tape guide blocks having guide posts for pulling out a magnetic tape from a tape cassette and winding it on the head drum, and guide block guide members for guiding the block. The loading rings are vertically spaced in coaxial relation at the outside of the drum base. The tape guide block is supported on the guide block guide members to be movable along a path slanted with respect to the two loading rings and is coupled to the lower loading ring by a connector mechanism, and the tape guide block is coupled to the upper loading ring, so that the two tape guide blocks are movable in opposite directions around a periphery of the head drum in response to rotation of the two loading rings for winding the tape helically on the periphery of the head drum over an angle of contact with the head drum of at least 300° and with a spacing between the beginning and end of a portion of the tape that contacts the head drum corresponding substantially to the width of the tape.
Inventors
- 👤 Eiji Ohshima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:05
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/60; G11B15/66; G11B15/665; G11B15/6653; G11B15/6656; G11B15/6658; G11B15/675; G11B15/67563; G11B15/67565
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
233 words
A magnetic tape loading device comprising a head drum having magnetic heads, a drum base supporting said head drum, a chassis, two loading rings supported on an upper surface of said chassis and rotatable in opposite directions, two tape guide blocks having guide posts for pulling out a magnetic tape from a tape cassette and winding it on said head drum, and guide block guide members for guiding one of said two tape guide blocks, said two loading rings being vertically spaced in coaxial relation at the outside of said drum base, said one of said two tape guide blocks being supported on said guide block guide members to be movable along a path slanted with respect to said two loading rings and being coupled to the lower loading ring by a connector mechanism, and the other of said tape guide blocks being coupled to the upper loading ring, so that said two tape guide blocks are movable in opposite directions around a periphery of said head drum in response to rotation of said two loading rings for winding said magnetic tape helically on said periphery of said head drum over an angle of contact with said head drum of at least 300° and with a spacing between the beginning and end of a portion of said magnetic tape that contacts said head drum corresponding substantially to the width of said magnetic tape.
Claim 2
Dependent Claim
233 words
A magnetic tape loading device comprising a head drum having magnetic heads, a drum base supporting said head drum, a chassis, two loading rings supported on an upper surface of said chassis and rotatable in opposite directions, two tape guide blocks having guide posts for pulling out a magnetic tape from a tape cassette and winding it on said head drum, and guide block guide members for guiding one of said two tape guide blocks, said two loading rings being vertically spaced in coaxial relation at the outside of said drum base, said one of said two tape guide blocks being supported on said guide block guide members to be movable along a path slanted with respect to said two loading rings and being coupled to the lower loading ring by a connector mechanism, and the other of said tape guide blocks being coupled to the upper loading ring, so that said two tape guide blocks are movable in opposite directions around a periphery of said head drum in response to rotation of said two loading rings for winding said magnetic tape helically on said periphery of said head drum over an angle of contact with said head drum of at least 300° and with a spacing between the beginning and end of a portion of said magnetic tape that contacts said head drum corresponding substantially to the width of said magnetic tape.
Claim 3
Dependent Claim
74 words
A magnetic tape loading device according to claim 1, comprising a first spring by which a torque from said lower loading ring is transmitted to said one of said tape guide blocks, so that when said one of said tape guide blocks is stopped in a position where an operation of loading said magnetic tape on said head drum is finished, said lower loading ring is stopped against the force of said first spring.
Claim 4
Dependent Claim
74 words
A magnetic tape loading device according to claim 1, comprising a second spring by which a torque from said upper loading ring is transmitted to the other of said tape guide blocks, so that when said other of said tape guide blocks is stopped in a position where an operation of loading said magnetic tape on said head drum is finished, said upper loading ring is stopped against the force of said second spring.
Claim 5
Dependent Claim
63 words
A magnetic tape loading device according to claim 1, wherein said one of said two tape guide blocks movable along said guide block guide members has a tape guide on a front end thereof for gradually moving said magnetic tape a distance corresponding substantially to the width of said magnetic tape during the operation of loading said magnetic tape on said head drum.
Claim 6
Dependent Claim
138 words
A magnetic tape loading device according to claim 1, wherein a plurality of guide posts are arranged in a path of travel of said magnetic tape from a position where said tape has been pulled out from said tape cassette to the position of said beginning of said portion of said tape that contacts said head drum, said two positions being of different height from one another, only two of said plurality of guide posts are slanted, one of said two slanted guide posts being mounted on said one of said two tape guide blocks and the other of said two slanted guide blocks being fixed to said chassis, and said magnetic tape is supported only by said two slanted posts over an extent thereof over which said difference in height as between said two positions takes place.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-27 | 1988-11-26 | 1989-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-27 | 1992-11-26 | 1993-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-27 | 1996-11-26 | 1997-05-28 | $7700.00 | Window Closed / Lapsed |