发明授权
US5282586A Apparatus for controlling tape tension in a magnetic tape device by controlling a reverse torque motor 失效
用于通过控制反向转矩电动机来控制磁带装置中的带张力的装置

Apparatus for controlling tape tension in a magnetic tape device by
controlling a reverse torque motor
摘要:
A tension control apparatus for a tape player comprising a motor for driving a reel table on which a tape reel is installed, a tension detector which is pressed by a biasing force of a spring to contact with a tape extending from the tape reel, a sensor for detecting a shifting amount of the tension detector, and a servo circuit which controls a load of the motor in response to an output of the sensor. The tension control apparatus further comprises a switching device which controls the load of the motor by a voltage supplied from an electric power source other than an output voltage supplied from the servo circuit until the output voltage from the servo circuit is stabilized when shifted to a tape travelling mode. And further the tension control apparatus comprises a limiter which suppresses the output voltage from the servo circuit to be equal to or less than a predetermined value. Thus, the present invention prevents an excessive reverse torque from occurring in a motor even if the tension detector abruptly hits the tape when the operation mode shifts from a stop mode to a play mode.
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