Patent ID: 8196913

Claim:
A clamping assembly for stringing machine, comprising: a slide member, a positioning device, a control device and a rail, the rail adapted to be located at a top of the stringing machine and a slot defined in the rail, the slide member movable along the slot, the positioning device located at an end of the slide member a tube located at the other end of the slide member, a clamping device inserted into the tube, the control device located between the positioning device and the tube; the control device including a pin, a ring-shaped member and a knob, the ring shaped member engaged with the slide member and the pin pivotably connected with the ring-shaped member, the pin pivotably connected with the knob, an annular space defined in a top of the ring-shaped member and a torsion spring received in the annular space, two ends of the torsion spring connected to the slide member and the knob respectively; the knob having a pin hole defined in an underside thereof and the slide member having a pivotal hole, the tube including an engaging section and a receiving section, a lower end of the engaging section being in contact with a top of the slide member, the receiving section having a positioning pin and a spring which biases the positioning pin so as to move the positioning pin axially, the tube having a slit which is located in the receiving section, the slide member having an insertion slot which communicates with the pivotal hole, the insertion slot extending to an underside of the knob, the positioning pin including a piece and an insertion member, the piece received in the receiving section and the insertion member engaged with the insertion slot, the piece and the insertion member being connected with each other by connection portion which is pivotably engaged with the slit, the insertion member inserted into the pin hole so as to secure the knob and prevent the knob from rotating accidentally, and the knob including a release button and a bolt, the button located corresponding to the pin hole, the bolt having a first end connected with the release button and a second end of the bolt extending through the knob and extending through the pin hole, the insertion member being removed from the pin hole by pushing the release button which pushes the bolt to move the insertion member so that the positioning pin releases the knob.