Patent ID: 8272135

Claim:
A saw blade clamping mechanism, comprising: a spindle having a longitudinal receiving slot, a radial spindle orifice, and an axially extended elongated slot; a clamping pin disposed in the spindle orifice; a rotating sleeve having an inner surface abutting an outer end of the clamping pin, a retaining slot having a circumferential section, and an axial section formed on an outer circumference of the rotating sleeve, wherein the axial section includes an upper end that is distal to a saw blade when the saw blade is being inserted into or removed from the receiving slot and a lower end that is proximate to the saw blade when the saw blade is being inserted into or removed from the receiving slot, and wherein the inner surface is a cam surface with varying radiuses; a guide pin axially fixed on the rotating sleeve and extending through the axial elongated slot of the spindle; a latch pin secured on the spindle and constrained by the retaining slot; and a torsion spring and a pressing spring connected between the spindle and the rotating sleeve to bias the rotating sleeve to one of a first position and a second position; wherein when the rotating sleeve is in the first position, the latch pin is positioned at an outer end of the circumferential section of the retaining slot, the cam surface resists on the outer end of the clamping pin to urge an inner end thereof to insert into the longitudinal receiving slot of the spindle; and when the rotating sleeve is in the second position, the latch pin is positioned at an the upper end of the axial section of the retaining slot, the cam surface releases the clamping pin and the inner end thereof retracts from the receiving slot of the spindle.