Patent US4133494A successfully refreshed from Google Patents.
US4133494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tape driving apparatus
Assignee: Nippon Columbia Co Ltd
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Filing: 1977-06-17
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Granted: 1979-01-09
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Expires: 1997-06-17
Abstract
Abstract A tape driving apparatus in which even if the radius of a magnetic medium such as a magnetic tape wound on a supply and/or take-up reel is varied, a current flowing in a servo motor coupled directly to a capstan, which is varied in accordance with a load, is utilized to make the speed of the servo-motor constant by controlling a reel motor and hence to make the back tension and take-up tension of the magnetic tape equal.
Inventors
- 👤 Katsuyoshi Nukui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:28
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/46; G11B15/54; G11B15/26; G11B15/28; G11B15/43
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
103 words
A tape driving apparatus, comprising: (a) a reel motor for driving a supply reel on which a magnetic tape is wound; (b) a capstan for transporting said tape at a constant speed; (c) a servo motor for driving said capstan; (d) a reel motor for driving a take-up reel which takes up said tape; (e) a first control means for controlling the speed of said servo motor to maintain said speed substantially constant; and (f) a second control means for controlling the voltage applied to at least one of said reel motors to maintain the current flowing through said servo motor substantially constant.
Claim 2
Dependent Claim
103 words
A tape driving apparatus, comprising: (a) a reel motor for driving a supply reel on which a magnetic tape is wound; (b) a capstan for transporting said tape at a constant speed; (c) a servo motor for driving said capstan; (d) a reel motor for driving a take-up reel which takes up said tape; (e) a first control means for controlling the speed of said servo motor to maintain said speed substantially constant; and (f) a second control means for controlling the voltage applied to at least one of said reel motors to maintain the current flowing through said servo motor substantially constant.
Claim 3
Dependent Claim
55 words
A tape driving apparatus as claimed in claim 1, in which said second control means includes means for comparing an output of said first control means with a reference value to carry out the controll of the voltage applied to said at least one of said reel motors with an output of said comparing means.
Claim 4
Dependent Claim
45 words
A tape driving apparatus as claimed in claim 2, in which said second control means includes a first detecting means for detecting a current flowing through said servo motor, a detected current being applied to said comparing means to be compared with said reference valve.
Claim 5
Dependent Claim
31 words
A tape driving apparatus according to claim 3, further comprising a switching means inserted between said first detecting means and said comparing means for cutting off said detected current upon start.
Claim 6
Dependent Claim
41 words
A tape driving apparatus as claimed in claim 4, further comprising a third control means including a second detecting means for detecting a speed of said tape and operating said switching means to control at least one of said reel motors.
Claim 7
Dependent Claim
32 words
A tape driving apparatus as claimed in claim 5, in which said third control means includes a comparing means for comparing an output of said second detecting means with a reference value.
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) | 1982-01-08 | 1982-07-10 | 1983-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-08 | 1986-07-10 | 1987-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-08 | 1990-07-10 | 1991-01-09 | $7700.00 | Window Closed / Lapsed |