US Patent 8186553 Fastener driving tool

A fastener driving tool providing a prolonged durability and stabilized fastener driving operation. The tool includes a housing 2, a motor 31 disposed in the housing 2, a plunger 63 disposed in the housing and driven by the motor 31 for driving a nail 1A, a cable member 52 connected to the plunger 63 for pulling the plunger 63 from its bottom dead center where the nail is driven into a workpiece to a top dead center, and a drum 51 driven by the motor for winding the cable member thereover. A cable member is wound over the drum by a length greater than a linear distance between the bottom dead center and the top dead center. The cable member is flexed or deflected due to own weight when the plunger is at the bottom dead center.