Patent ID: 7584946

Claim:
An electric positioning and clamping apparatus comprising: a workpiece supporting stand having, at its tip, a workpiece supporting face contacting with a panel material; a locating pin attached to the workpiece supporting stand so as to protrude from the workpiece supporting face, and fitted into a positioning hole formed in the panel material; a clamp arm accommodated in a slit, which is formed in the locating pin so as to be open in a diametrical direction of the locating pin, the clamp arm being swingable between a clamp position where the clamp arm protrudes from the slit to clamp the panel material between the workpiece supporting face and the clamp arm and an escape position where the clamp arm enters into the slit; a driven rod mounted to the workpiece supporting stand so as to be reciprocable axially between a retreat-limit position corresponding to the clamp position of the clamp arm and an advance-limit position corresponding to the escape position of the clamp arm, a tip of the driven rod being coupled to the clamp arm; a driving rod mounted in a gear box attached to the workpiece supporting stand so as be reciprocable axially between the retreat-limit position and the advance-limit position, the driving rod being coupled to a rear end of the driven rod; a spring member mounted between the driven rod and the driving rod, and applying a clamping force to the clamp arm via the driven rod when the driving rod is at the retreat-limit position; a cam block assembled in the gear box so as to be reciprocable in a direction of intersecting the driving rod, having a cam face contacting with an engagement cam attached to the driving rod, and causing the driving rod to be driven between the retreat-limit position and the advance-limit position; and an electric motor assembled in the gear box, and causing the cam block to reciprocate, via a reduction gear mechanism, between a clamp position corresponding to the retreat-limit position and an unclamp position corresponding to the advance-limit position.