The supporting shaft is rectangularly placed next to the passageway of yarn. The guide plate, wax and compressing member are gardually established on the supporting shaft in order to rotate. The tensile spring is placed in the rear-part of the guide plate. When the symbol F is the compressing force, the symbol P is the force of a tensile spring, the friction coefficient is , and the weight of wax and compressing member is W, formula F=P- W is coming into being. And then, the tensile spring is set up for that F is constant.
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