Patent ID: 8912872
Filing Date: 2014-12-16
Classification: B21J,B23Q,B25B,B25J,H01F

Abstract:
1. A clamp assembly for clamping a stack having a first surface and a second surface, the clamp assembly comprising: a first clamp including a plurality of magnet devices, each magnet device including a permanent magnet and a coil surrounding the permanent magnet; a controller for pulsing the coils to selectively magnetize and demagnetize the permanent magnets; and a second clamp generally opposite the first clamp that forms an air gap with at least one of the permanent magnets of the first clamp, the second clamp providing a flux path between at least two of the plurality of magnet devices, wherein the first clamp is configured to be positioned against the first surface of the stack; wherein the second clamp is configured to be positioned against the second surface of the stack; and wherein the air gap is configured to receive the stack.