发明名称 |
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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申请公布号 |
US5282586(A) |
申请公布日期 |
1994.02.01 |
申请号 |
US19920816688 |
申请日期 |
1992.01.02 |
申请人 |
ALPS ELECTRIC CO., LTD. |
发明人 |
SUZUKI, MASAHITO;SARUDATE, AKIYOSHI |
分类号 |
G11B15/43;G11B15/665;(IPC1-7):G11B15/43;B65H59/38 |
主分类号 |
G11B15/43 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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