Patent ID: 6478310
Filing Date: 2002-11-12
Classification: B23B,Y10T

Abstract:
A combination pneumatic chuck with a position detecting mechanism, comprsing:a casing having therein a cylinder bore; a stroke first air cylinder mechanism including a larger-diameter first piston housed for sliding in said cylinder bore in said casing and a larger-diameter first rod having a base end portion connected to said first piston and a tip end portion projecting outside from a tip end face of said casing; a chuck second air cylinder mechanism including a smaller-diameter second piston housed for sliding coaxially in said first piston and a smaller-diameter second rod having a tip end portion connected to said second piston and extending to an inside of said first rod and a base end portion extending to such a position as to project from said first piston and to face a position detecting portion of said casing; a chuck head mounted to said tip end of said first rod for moving forward and rearward in response to expansion and contraction of said first rods; a plurality of jaw members for grasping a workpiece and mounted for opening and closing to said chuck head; a converting mechanism disposed between said jaw members and said second rod in said chuck head for converting expanding and contracting operations of said second rod into opening and closing operations of said jaw members; and a chuck position detecting mechanism for detecting opening and closing positions of said jaw members and which includes a detected member mounted to said base end portion of said second rod and a position sensor mounted to a position detecting portion of said casing for detecting said detected member.