US3582743A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed control system for tape recorder apparatus
Assignee: Nortel Networks Inc
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Filing: 1969-03-13
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Granted: 1971-06-01
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Expires: 1989-03-13
Abstract
Abstract In a tape recorder/reproducer apparatus, particularly where a low-inertia highly responsive drive train is used, tape speed control means including a variable-speed motor for the drive train energized through a closed-loop servosystem in which the actual output speed of the motor is monitored by a sensor and compared to a reference, to closely control the motor speed in accordance with the reference. The reference is provided by a freely supported capstan which senses actual tape speed at the tape head and produces an output which is compared to a predetermined reference representative of the desired tape speed, such that the motor is servo controlled to satisfy a predetermined tape speed function.
Inventors
- 👤 Guillermo Diaz
- 👤 Robert E Wood
- 👤 Samuel N Irwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:11
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/46; G11B15/54; G11B15/60; Y; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/909; Y10S388/923; Y10S388/93
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
229 words
Tape speed control apparatus for tape recorder/reproducer apparatus of the type having a drive train for moving recording tape past a tape head at a speed proportional to that of a drive motor in said drive train, said apparatus comprising: a variable speed motor for said drive train; drive excitation means for providing an energizing signal to said motor and thereby controlling its speed; means for monitoring the speed of said motor and providing an output signal representative thereof; and control means coupled between said monitoring means and said drive excitation means to receive said output signal from the former and to control the latter in accordance therewith, such that the motor-energizing signal provided by said excitation means varies in a manner maintaining the actual speed of said motor at predetermined valued; said control means including means for generating a reference signal, which is instantaneously representative of periodically varying desired motor speeds, and further including means for producing a control signal representative of differences between said monitoring means output signal and said reference signal, said control signal being coupled to said motor drive excitation means to control the latter; said means for providing a reference signal also including means for sensing the linear speed of said recording tape past said tape head, said reference signal being representative of differences between the sensed tape speed and a desired tape speed.
Claim 2
Dependent Claim
229 words
Tape speed control apparatus for tape recorder/reproducer apparatus of the type having a drive train for moving recording tape past a tape head at a speed proportional to that of a drive motor in said drive train, said apparatus comprising: a variable speed motor for said drive train; drive excitation means for providing an energizing signal to said motor and thereby controlling its speed; means for monitoring the speed of said motor and providing an output signal representative thereof; and control means coupled between said monitoring means and said drive excitation means to receive said output signal from the former and to control the latter in accordance therewith, such that the motor-energizing signal provided by said excitation means varies in a manner maintaining the actual speed of said motor at predetermined valued; said control means including means for generating a reference signal, which is instantaneously representative of periodically varying desired motor speeds, and further including means for producing a control signal representative of differences between said monitoring means output signal and said reference signal, said control signal being coupled to said motor drive excitation means to control the latter; said means for providing a reference signal also including means for sensing the linear speed of said recording tape past said tape head, said reference signal being representative of differences between the sensed tape speed and a desired tape speed.
Claim 3
Dependent Claim
24 words
The apparatus of claim 1, wherein said means for sensing tape speed includes a rotatable member for engaging the tape and being rotated thereby.
Claim 4
Dependent Claim
20 words
The apparatus of claim 2, wherein said rotatable member compriseS a free, undriven capstan member moved only by said tape.
Claim 5
Dependent Claim
41 words
The apparatus of claim 3, wherein said capstan member has tape-engaging surface portions of a frictional material, and wherein said means for sensing tape speed further includes a pinch roller having a roller element of hard material with a lubricous surface.
Claim 6
Independent Claim
160 words
A method of driving recording tape past the tape head of a recorder/reproducer apparatus at controlled speeds comprising the steps: rotating the takeup reel for such tape to pull the tape past the tape head; monitoring the actual linear speed of the tape as it is pulled past such head; producing control signals which are representative of differences between the monitored actual tape speed and a desired tape speed; and varying the speed at which said takeup reel is rotated in accordance with said control signals by changing the effective output of a variable-speed electric motor driving said reel to maintain the linear speed of said tape past said head at said desired speed, including the steps of energizing said motor by a closed-loop system in which the motor speed is monitored and controlled at a predetermined nominal value, and using said control signals representative of actual tape speed to vary the speed of said motor from said nominal value.
Claim 7
Independent Claim
160 words
A method of driving recording tape past the tape head of a recorder/reproducer apparatus at controlled speeds comprising the steps: rotating the takeup reel for such tape to pull the tape past the tape head; monitoring the actual linear speed of the tape as it is pulled past such head; producing control signals which are representative of differences between the monitored actual tape speed and a desired tape speed; and varying the speed at which said takeup reel is rotated in accordance with said control signals by changing the effective output of a variable-speed electric motor driving said reel to maintain the linear speed of said tape past said head at said desired speed, including the steps of energizing said motor by a closed-loop system in which the motor speed is monitored and controlled at a predetermined nominal value, and using said control signals representative of actual tape speed to vary the speed of said motor from said nominal value.
Claim 8
Dependent Claim
42 words
The method of claim 5, wherein the speed of the tape is monitored by placing a rotatable member in contact with said tape and moving the member and the tape at the same rate, and sensing the rotary movement of such member.
Claim 9
Dependent Claim
32 words
The method of claim 6, wherein said tape speed is monitored by freely supporting said member as an independent rotatable component and rotating the same by driving the tape contacting such member.
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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |