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Electromagnetically driven punch press with magnetically isolated removable electromagnetic thrust motor

  • US 5,113,736 A
  • Filed: 06/26/1990
  • Issued: 05/19/1992
  • Est. Priority Date: 06/26/1990
  • Status: Expired due to Fees
First Claim
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1. In an electromagnetically driven punch press including a base for mounting base tooling and having a plurality of guide pins upstanding from the base in spaced relationship among said guide pins, and a motion member above the base for mounting upper tooling above the base tooling, said motion member being carried by bushings mounted to the motion member, respective bushings being movable downwardly along respective guide pins during a downward stroke of said motion member and being movable upwardly along the respective guide pins during an upward return stroke of said motion member, the invention comprising:

  • said guide pins extending up through said bushings to upper ends of the guide pins at an elevation at least about two inches (at least about 50 mm) above said motion member when said motion member is at an initial position prior to its downward stroke,a top mounting member attached to said upper ends of said guide pins,said top mounting member being ferromagnetic,said ferromagnetic top mounting member being at an elevation at least about two inches (at least about 50 mm) above said motion member when said motion member is at said initial position,a solenoid winding mounted above said top mounting member and having a vertical opening surrounded by said winding,a vertically movable ferromagnetic armature aligned with said winding opening and being movable downwardly and upwardly in said winding opening,a ferromagnetic enclosure for said winding,said ferromagnetic enclosure being over a top of the solenoid winding and being mounted to said mounting member,said ferromagnetic enclosure having an opening positioned near the top of said winding aligned with said winding opening,said armature extending up through said opening in said ferromagnetic enclosure,said top mounting member having an opening positioned near the bottom of said winding aligned with said winding opening,a pair of non-magnetic push rods connected to said armature and extending down through said opening in said top mounting member and being connected to said motion member for driving said motion member downwardly upon electrical energization of said solenoid winding, andreturn means mounted on said top mounting member and being connected to said motion member for moving said motion member in said upward return stroke.

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