| 摘要 |
A racket stringing apparatus includes a racket support frame rotatably mounted about a vertical axis on a suitable support base and including head and handle clamps for clamping the racket in the apparatus; an automatic tensioning head including an extensible arm having an automatic string head clamp mounted thereon, for extending outward from the support frame for applying a continuous preselected tension to a string attached thereto by the clamp; a cross slide platform mounted centrally of the support frame and between the racket clamps and including string holding clamps mounted on a slidable cross bar mounted on the cross slide platform, the cross slide platform being indexable to rotate about a vertical axis coincident with the vertical axis of the support frame. Power means for applying the continuous tension to the tension head includes, in one embodiment, a source of fluid pressure and a cylinder responsive to the pressure for applying a continuous preselected force on the string and valve controls including a valve responsive to the tension head clamp for activating the cylinder. An alternate embodiment includes weights of a preselected mass connected to the tensioning arm through a cable and pulley arrangement for applying a continuous uniform outward pressure on the tension head.
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