发明名称 |
Apparatus for tension control of a flexible material during winding or unwinding from a drum or reel |
摘要 |
Apparatus for controlling the tension of travelling filamentary material such as that being unwound from a drum or spool. It comprises a three phase induction motor for turning the drum or spool modified to have a high resistance rotor providing a torque speed characteristic of falling torque with increasing speed. The motor drive, and torque in either forward or reverse drive, is controlled by a pair of thyristor banks selectively triggered for forward and reverse drive modes by error signals representative of variation in tension from the required value.
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申请公布号 |
US4789813(A) |
申请公布日期 |
1988.12.06 |
申请号 |
US19860937070 |
申请日期 |
1986.12.02 |
申请人 |
BETA INSTRUMENTS CO., LTD. |
发明人 |
ORCHARD, OWEN J. |
分类号 |
B65H59/38;(IPC1-7):B65H59/38 |
主分类号 |
B65H59/38 |
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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