US3734368A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic tape recorder with constant tape tension
Assignee: Individual
•
Filing: 1971-11-26
•
Granted: 1973-05-22
•
Expires: 1991-11-26
Abstract
Abstract A magnetic tape recorder having a tape tension regulator for maintaining a constant tension on the tape while recording, reproducing or erasing. A resiliently mounted pulley is coupled to an impedance in the motor input circuit so that a displacement of the pulley controls the speed of the motor.
Inventors
- 👤 S Kudelski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:53
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/43
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
126 words
Apparatus for regulating the tension of a magnetic tape while the tape is moved through a tape recorder by means of two electric motors, comprising: a first capstan drive coupled to the first motor and in contact with the tape to move it to a take up reel; a resiliently mounted pulley in running contact with a loop portion of the tape, the position of said pulley being responsive to the tension of the tape; a second capstan drive coupled to a second motor to pull the tape from a supply reel; and a variable impedance coupled to said pulley and having its impedance value controlled by the position of the pulley, said impedance connected in series with the first motor for controlling the motor speed.
Claim 2
Dependent Claim
126 words
Apparatus for regulating the tension of a magnetic tape while the tape is moved through a tape recorder by means of two electric motors, comprising: a first capstan drive coupled to the first motor and in contact with the tape to move it to a take up reel; a resiliently mounted pulley in running contact with a loop portion of the tape, the position of said pulley being responsive to the tension of the tape; a second capstan drive coupled to a second motor to pull the tape from a supply reel; and a variable impedance coupled to said pulley and having its impedance value controlled by the position of the pulley, said impedance connected in series with the first motor for controlling the motor speed.
Claim 3
Dependent Claim
36 words
Apparatus as claimed in claim 1 wherein said pulley is mounted at one end of an arm which is pivotally mounted at its other end and connected to a spring means for providing the tape tension.
Claim 4
Dependent Claim
28 words
Apparatus as claimed in claim 2 wherein said arm is coupled to A sliding contact moving along a resistance element coupled to an input circuit of the motor.
Claim 5
Dependent Claim
37 words
Apparatus as claimed in claim 2 wherein said arm is coupled to a ferromagnetic core moving in the magnetic field of a conductive winding and wherein the winding is coupled to an input circuit of the motor.
Claim 6
Dependent Claim
19 words
Apparatus as claimed in claim 1 wherein said impedance is connected in series with the electric motor input circuit.
Claim 7
Dependent Claim
80 words
Apparatus for ensuring that the magnetic tape of a tape recorder moves with constant tension during its passage in front of at least one magnetic head characterized in that two tape capstan drives are arranged one on either side of the magnetic head, two motors for driving said tape capstans, and a regulator responsive to variations in the tension of the tape between said two capstan drives for controlling the speed of at least one of the capstan drive motors.
Claim 8
Dependent Claim
80 words
Apparatus for ensuring that the magnetic tape of a tape recorder moves with constant tension during its passage in front of at least one magnetic head characterized in that two tape capstan drives are arranged one on either side of the magnetic head, two motors for driving said tape capstans, and a regulator responsive to variations in the tension of the tape between said two capstan drives for controlling the speed of at least one of the capstan drive motors.
Claim 9
Dependent Claim
29 words
Apparatus according to claim 6 characterized in that the regulator controls the speed of both capstan drive motors, the controls of the two motors being effected in opposite directions.
Claim 10
Dependent Claim
38 words
Apparatus according to claim 6 characterized in that a tape loop is created between one of the capstan drives and said magnetic head, and the control regulator is sensitive to the variations in the length of the loop.
Claim 11
Dependent Claim
61 words
Apparatus according to claim 8 characterized in that the control regulator includes a movable member for engagement in the loop formed by the tape, said movable member being resiliently biased for maintaining it in contact with the base of the loop and ensuring that said loop has a predetermined tension, the regulator being sensitive to the displacements of said movable member.
Claim 12
Dependent Claim
15 words
Apparatus according to claim 8 characterized in that the movable member is a rotatable pulley.
Claim 13
Dependent Claim
37 words
Apparatus according to claim 10 characterized in that the pulley is mounted at one end of an arm which is pivotally mounted at the other end and is connected to spring means for providing said resilient bias.
References Cited (Backward Citations)
US3419202A
Cited
US3667664A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |