| 摘要 |
A string tensioning force controlling apparatus for a racket stringer includes a string pulling mechanism having a support housing, a string pulling head movably supported by the support housing for engaging a string, and a drive arrangement drivingly coupled to the string pulling head. The apparatus also includes an encoder disposed adjacent to the string pulling mechanism for sensing displacement of the string pulling head relative to the support housing and generating a digital output signal representative thereof, and a central processing unit for receiving the digital output signal and in response thereto controlling operation of the drive arrangement to move the string pulling head such that a desired tensioning force is accurately applied to the string so as to produce a tensioned string.
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