Patent ID: 8920295

Claim:
A cutter-changing device, comprising: a cutter-magazine for carrying a plurality of cutters; a clamping sub-assembly comprising a cutter-changing arm, and a pair of clamping assemblies for clamping the cutters; a rotary telescopic cylinder driving the cutter-changing arm to rotate about a central axis thereof, extend away from the rotary telescopic cylinder and retract towards the rotary telescopic cylinder; the rotary telescopic cylinder comprising: a cylinder body defining a receiving chamber, a first through hole, and a second through hole at a sidewall of the cylinder body communicating with the receiving chamber, a guiding member received in the receiving chamber and fixed with the cylinder body, a piston member sleeved on the guiding member and fixed with the cutter-changing arm, and a pair of guiding rods mounted at an end of the cylinder body and connected with the cutter-changing arm, wherein the piston slides along the guiding member to drive the cutter-changing arm to rotate about the central axis, extend away from the rotary telescopic cylinder and retract towards the rotary telescopic cylinder, wherein each clamping assembly comprises a mounting member, an elastic member, a piston, and at least one resisting member; the mounting member is mounted on the cutter-changing arm, and defines at least one mounting hole through a sidewall of the mounting member corresponding to the at least one resisting member; the elastic member and the piston are sleeved with the mounting member, one of two opposite ends of the elastic member presses against the piston and another one of the two opposite ends of the elastic member presses the mounting member; the at least one resisting member is mounted between the elastic member and the mounting member, and capable of being resisted by the piston to be partially exposed from the at least one mounting hole.