Abstract: A racquet stringing machine includes a base, a clamp device for clamping a racquet frame, and a string pulling device. The clamp device has a turntable and a clamping portion. The turntable includes a rotating shaft pivotally connected to the base. The clamping portion is fixed on the turntable. The string pulling device is disposed at one side of the clamp device for tightening a string passing through the racquet frame and rotating the turntable according to a threading position. The base is provided with a sensing unit electrically connected to the string pulling device for sensing the present threading position of the string and for generating a control signal to control the string pulling device to pull the string.

Abstract: A stringing device of a racket stringing machine includes a shell whose internal surrounding surface is defined with a track extending along a straight line; a sliding base accommodated in the track of the shell, with wheels on its opposite sides to roll on the surrounding surface of the track; a stringing head fixed on the sliding base by its bottom end; a transmission mechanism connected to the sliding base to drive the sliding base to slide along the track, concurrently driving the stringing head on the sliding base to move along a straight line.

Abstract: A stringing machine includes a base and an adjustable stringing platform coupled to the base. The stringing platform includes a turntable rotatable about a first axis, and a first releasable resistance assembly coupled to the turntable. The first releasable resistance assembly is selectable between an engaged operating mode in which the releasable resistance assembly resists rotation of the turntable about the first axis, and a disengaged operating mode in which the releasable resistance assembly does not resist rotation of the turntable about the first axis. The releasable resistance assembly includes a magnetorheological fluid for resisting rotation of the turntable about the first axis when in the engaged operating mode.

Abstract: An ergonomically-designed racquet stringing machine. In certain embodiments, the stringing machine includes a stand extending from a base at an angle between about 70 and about 89 degrees from horizontal. In certain embodiments, the stringing machine includes a releasable resistance assembly configured to provide resistance to rotation of the turntable about an axis.