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Apparatus for guiding a wire electrode on a machine tool

  • US 5,519,181 A
  • Filed: 07/06/1994
  • Issued: 05/21/1996
  • Est. Priority Date: 07/06/1994
  • Status: Expired due to Fees
First Claim
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1. An apparatus for guiding a wire on a machine tool comprising:

  • a cylindrical upper guide head having a central longitudinal through hole to receive a wire electrode, two lateral parallel screw holes in an upper portion, and a pin hole in a lower portion;

    a cylindrical lower guide head having a center longitudinal through hole to receive a wire electrode, two lateral parallel screw holes in a lower portion, and a pin hole in an upper portion;

    an upper guide arm having a front U-shaped block and a rear U-shaped block connected to each other by an intermediate rod, the front U-shaped block having two parallel screw holes in two parallel portions for screws to secure the front U-shaped block with the upper portion of said upper guide head;

    a lower guide arm having a front U-shaped block and a rear U-shaped block connected to each other by an intermediate rod, the front U-shaped block having two parallel screw holes in two parallel portions for screws to secure the front U-shaped block with the lower portion of said lower guide head;

    an upper cylinder having a closed upper end, a longitudinal hole, and two parallel screw holes to receive screws to secure the upper cylinder to the rear U-shaped block of said upper guide arm;

    a lower cylinder having a closed lower end, a longitudinal hole, and two parallel screw holes to receive screws to secure the lower cylinder to the rear U-shaped block of said lower guide arm;

    a connecting rod having a diameter smaller than the longitudinal holes of said upper and said lower cylinders so that said connecting rod fits into said two longitudinal holes to allow said upper and said lower cylinders to move up and down along the connecting rod so that the space between said upper and said lower cylinder is varied;

    a pivotal arm having a front U-shaped block bored with a lateral pin hole in each of two parallel portions to receive a pin to pivotally connect the front U-shaped block with said upper portion of said lower guide head, a rear hollow rectangular block for said connecting rod to pass through, an intermediate rod connecting the front U-shaped block and the rear hollow rectangular block, and a rear rod extending from a rear end of the rectangular block to fit rotatably in a bearing attached to a machine frame;

    an input arm having a front U-shaped block bored with a lateral pin hole in each of two parallel portions to receive a pin to pivotally connect the front U-shaped block with said upper guide head, a rear hollow rectangular block, an intermediate rod connecting the front U-shaped block with the rear hollow rectangular block, and a rear rod extending from a rear end of the rectangular block fit rotatably in a bearing attached on a threaded rod connected with a first, a second, and a third motor mounted on a machine frame; and

    whereinsaid input arm is movable back and forth by said first motor, said pivotal arm being able to rotate around said pin combining said lower guide head and said pivotal arm, said upper and said lower guide heads also move laterally, said input arm swings longitudinally via the pivotal arm functioning as a pivotal shaft and forcing said upper and said lower guide heads to incline longitudinally, said connecting rod allowing said upper and said lower cylinder to move up and down when said upper and said lower guide head move nearer to or farther from each other, and thereby said upper and said lower guide heads incline at the same time in accordance with the inclination of the wire electrode so as to secure tension of the wire electrode, to prevent wear of said wire electrode, to lower the rate of breaking of the wire electrode, to increase an eroding angle, and to reinforce jetted water flow into a working zone.

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