Title: Transport system for magnetic tape recorder and reproducer sets, particularly for cassette magnetic tape recorders

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1. In a tape transport system for use in a magnetic tape recorder and reproducer set wherein a magnetic tape is simultaneously driven by means of two capstans, the improvement comprising two motors, one of which is associated with one of said capstans, and the other with the other capstan, driving discs connected to said motors, transmission belt means connecting the driving discs of the two motors, means for operating the motor downstream relative to the moving magnetic tape as the driving motor for said tape, electrical circuit means associatable with said upstream motor for adapting the latter as a tachometer-generator, and means for controlling the rpm of said downstream motor by applying thereto signals emitted by said tachometer-generator.

2. The improved tape transport system as described in claim 1, further comprising electrical braking means for braking the motor upstream relative to the other motor seen in the direction of the moving tape.

3. The improved tape transport system as described in claim 2, wherein said electrical braking means comprise an adjustable load resistor.

4. The improved tape transport system as described in claim 2, further comprising a transistor circuit comprising differentially put means and being adapted for serving as rpm adjusting unit for the control of said motors, said transistor circuit having inverting input means and non-inverting input means, means for applying a tachometer voltage from said tachometer-generator to said inverting input means, and means for applying a reference voltage, corresponding to a desired tape speed, to said non-inverting input means.

5. The improved tape transport system as described in claim 1, wherein said motors are commutator motors comprising iron-free rotors.

6. The improved tape transport system as described in claim 1, wherein said capstans serve as spindles for said two motors.

7. The improved tape transport system as described in claim 1, further comprising pressure rollers urging said magnetic tape against said capstans, means for reversing the direction of run of said tape, and means for maintaining the pressure of said pressure rollers on said tape during reversal of the direction of tape run by said reversal means.

8. The improved tape transport system as described in claim 7, further comprising current supply means and means for interrupting the supply of electrical current to said driving downstream motor, and means for maintaining the pressure of said pressure rollers on said tape during stopping and starting of said driving motor, whereby rapid starting and stopping of the magnetic tape is ensured.

9. The improved tape transport system as described in claim 8, further comprising current supply means, means for interrupting the supply of electric current to the driving downstream motor and means for shortcircuiting the windings of the rotors of said motors concurrently with interruption of current supply to said driving motor.

10. The improved tape transport system as described in claim 1, further comprising adjustable resistor means adapted for eliminating excessive tolerances in the operation of said motors which may undesirably influence the tape speed or the tensioning of the tape or both.

Other info:

Inventors: Richt, O. Hubert (Socking, DT)

Application Number: 573888
Filing Date: 1975-05-02
Publication_date: 1976-04-27
Assignee:
Primary Class(es): 226/49 226/42, 226/111, 226/178
Other Classes:
US Patent Ref:

3112052	Nov, 1963	Johnson	226/42.
3419202	Dec, 1968	Maxey	226/111.
3861573	Jan, 1975	Kawasaki	226/111.

Other Refs:
Primary Examiner: Schacher, Richard A.
Assistant Examiner:
Attorney: Herzfeld; Heinrich W., Wells; Gilbert L.