Abstract: A tool clamping device of a tool seat is installed on a multifunctional machining center for firmly securing a tool having a steel ball collar and comprises a spindle, a disc-type spring, a draw rod, a hydraulic member and a steel ball. The draw rod is able to slide with respect to the spindle, pressed by the disc-type spring to contact the spindle, and pushed by the hydraulic member to separate from the spindle. The draw rod has a draw ring, and the steel ball is accommodated in the draw ring. The disc-type spring presses the draw rod and makes the draw ring push the steel ball outward and latch the steel ball collar of the tool, whereby the tool is firmly secured. The hydraulic member applies pressure to move the draw ring to accommodate the steel ball, whereby the tool is released.

Abstract: A deceleration device for a power turret clutch, which outputs dynamic power to a spindle connector, comprises a deceleration gear assembly, a slide gear shaft, a displacement driving unit, and a transmission spindle. The displacement driving unit and the transmission spindle respectively drive the slide gear shaft to slide axially and rotate, whereby the slide gear shaft can supply dynamic power. The slide gear shaft has a gear. The gear engages with the deceleration gear assembly or the spindle connector according to the position the slide gear shaft slides to. According to whether the slide gear shaft engages with the deceleration gear assembly or the spindle connector, one of two rotation speeds is selected to output dynamic power via the single transmission spindle.