Patent ID: 8573662
Filing Date: 2013-11-05
Classification: B66C,H01F

Abstract:
1. A magnetic workpiece handling device comprising: a housing; a housing bottom secured to the housing, the housing bottom having an end face facing a workpiece to be grabbed; a magnetic piston disposed in the housing; at least one fluid connection for delivering a working fluid into the housing for moving the magnetic piston between an operating position and a rest position, the working fluid being delivered at at least a first working pressure and a second working pressure, the first working pressure transferring the magnetic piston into the operating position in which the magnetic piston is positioned on or close to the housing bottom, and the second working pressure transferring the magnetic piston into the rest position in which the magnetic piston is positioned away from the housing bottom; and a detection device to detect the holding or the non-presence of the workpiece on the end face of the housing and to determine a pressure of the working fluid, wherein the magnetic piston has a holding magnet for holding the workpiece against the housing bottom, the holding magnet faces the housing bottom and is movable within the magnetic piston, and the holding magnet controls a valve arrangement of the detection device.