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US3612376A Expired / Lapsed US ⏱️ 0.0 years remaining

Tape transport for a helical scan tape recorder

Assignee: Ampex Corp
•
Filing: 1970-03-24
•
Granted: 1971-10-12
•
Expires: 1990-03-24
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Abstract

Abstract A closed loop capstan for a tape transport of a helical scan, magnetic tape recording and reproducing apparatus. The capstan includes a first portion which is fixedly attached to a shaft of the capstan which fixed portion engages a magnetic tape exiting from a transducing tape loop formed about a scanning assembly. The capstan also includes a second portion which is rotatably coupled to the drive shaft by a viscous damping fluid. This viscous coupled second portion engages the tape as it enters the transducing loop. Thus, the second portion of the capstan rotates relative to the first portion of the capstan but because of the viscous coupling, the torque required to cause rotation thereof is related to the rate of rotation. The capstan thereby effectively isolates supply tape tension fluctuations, but at the same time, passes changes in the level of supply tape tension without attenuation.

Inventors

  • 👤 Delmar R Johnson

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-05 19:39
CPC Classifications
F; F16; F16D; F16D35/00; G; G11; G11B; G11B15/00; G11B15/18; G11B15/26; G11B15/28; G11B15/46; G11B15/50; G11B15/60; G11B15/61

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 112 words
In a helical scan type of magnetic tape apparatus, wherein a magnetic recording tape follows a tape path including successively a supply run, a closed transducing loop, at least one transducing head positioned in said transducing loop, and a takeup run, a capstan comprising a shaft, first and second coaxial cylindrical portions disposed on said shaft in axially displaced relationship, said first portion being fixedly coupled to said shaft, said second portion being rotatably mounted on said shaft, and a viscous damping fluid coupling said second portion to said shaft, the tape entering said transducing loop contacting said second portion and the tape exiting from said transducing loop contacting said first portion.
Claim 2
Dependent Claim 112 words
In a helical scan type of magnetic tape apparatus, wherein a magnetic recording tape follows a tape path including successively a supply run, a closed transducing loop, at least one transducing head positioned in said transducing loop, and a takeup run, a capstan comprising a shaft, first and second coaxial cylindrical portions disposed on said shaft in axially displaced relationship, said first portion being fixedly coupled to said shaft, said second portion being rotatably mounted on said shaft, and a viscous damping fluid coupling said second portion to said shaft, the tape entering said transducing loop contacting said second portion and the tape exiting from said transducing loop contacting said first portion.
Claim 3
Dependent Claim 39 words
Apparatus according to claim 1, wherein the internal diameter of said second portion of said capstan is spaced from the outer diameter of said shaft by a small clearance, and the viscous damping fluid is disposed in said clearance.
Claim 4
Dependent Claim 22 words
Apparatus according to claim 2, wherein annular recesses are provided in said internal diameter which serve as reservoirs for the viscous fluid.
Claim 5
Dependent Claim 14 words
Apparatus according to claim 1, wherein the viscous fluid has a high kinematic viscosity.

References Cited (Backward Citations)

US3189273A Cited
US3439850A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1974-10-11 1975-04-12 1975-10-12 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1978-10-11 1979-04-12 1979-10-12 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1982-10-11 1983-04-12 1983-10-12 $7700.00 Window Closed / Lapsed

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