| 20110296969 | Multiple punch unit for punch presses - A multiple punch apparatus for punch presses having a provision for preventing undesired damage to a work-piece includes a housing having a plurality of separate punches that include at least one inactive punch and one active punch, each inactive punch being supported in an elevated position by retention magnet means having flux lines oriented to extend into at least each inactive punch when the active punch is in a position in which it is driven into engagement with a work-piece, whereby each inactive punch is magnetically supported to prevent any unintended contact with the work-piece. | 12-08-2011 |
