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
- 专利标题: Apparatus for controlling tape tension in a magnetic tape device by controlling a reverse torque motor
- 专利标题(中): 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
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申请号: US816688申请日: 1992-01-02
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公开(公告)号: US5282586A公开(公告)日: 1994-02-01
- 发明人: Masahito Suzuki , Akiyoshi Sarudate
- 申请人: Masahito Suzuki , Akiyoshi Sarudate
- 申请人地址: JPX Tokyo
- 专利权人: Alps Electric Co., Ltd.
- 当前专利权人: Alps Electric Co., Ltd.
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX3-13938 19910111
- 主分类号: G11B15/43
- IPC分类号: G11B15/43 ; G11B15/665 ; B65H59/38
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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