Patent ID: 6869068

Claim:
An electric clamping device wherein an electric motor, a speed reducing mechanism formed of multistage spur gears to reduce a speed of rotation of the electric motor, a linkage connected to the speed reducing mechanism, and a clamp arm shaft to which a clamp arm connected to the linkage is mounted are retained on a body, the linkage includes a crank link which is rotatably connected at an end thereof to a crank gear formed of a last-stage spur gear of the speed reducing mechanism and which converts a rotational motion of the spur gear into a linear motion, a cam follower link rotatably connected to a tip end of the crank link and bent at an intermediate portion such that a cam follower moving on a cam rail face provided to the body is rotatably supported on the bend, and a driving lever projecting from the clamp arm shaft to be connected to a tip end of the cam follower link, and the linkage forms a toggle linkage for stably retaining a clamping force of the clamp arm together with the cam rail face.