TUBE LOUVERING MACHINE:PUNCHES ANGULARLY SPACED AROUND TUBE MOVE RADIALLY TO PUNCH LOUVRE HOLES THEREIN

摘要

An apparatus to simultaneously punch a series of louver holes in a tubular workpiece. The apparatus having a series of punches angularly spaced around the workpiece, which punches are caused to reciprocate by the engagement thereof by a series of inclined surfaces of a rotatable member located around the workpiece. The apparatus further includes gripping means to hold the workpiece during punching operations and to move the workpiece in between successive punching operations.