Magnetic cylinder to hold tool made of thin foil has many cylindrical permanent magnets set in array of blind bores in surface of cylinder

摘要

The cylinder has shaft stubs (10,11) at the ends (13,14). The cylinder (12) between the ends has an array of permanent magnets (15) set in blind bores. The magnets are cylindrical with the north and south poles at the ends, with e.g. their north poles facing outward, flush with the surface of the cylinder and their south poles facing inward.