US Patent 7537420 Working machine that can clamp a workpiece automatically

A working machine includes a base for placing a workpiece, a working mechanism movable relative to a first face of the workpiece, a clamping unit movable relative to a second face of the workpiece, a linkage connected to the working mechanism and the clamping unit to drive the working mechanism and the clamping unit to move relative to the workpiece simultaneously, and a drive unit connected to the linkage. Thus, the working machine is operated by a user's one foot, so that the working machine is operated easily and conveniently. In addition, the workpiece is clamped automatically without having to hold the workpiece by a user's one hand, thereby protecting the user's safety.