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Sensing system for magnetic clamping devices

  • US 6,636,153 B1
  • Filed: 07/26/2001
  • Issued: 10/21/2003
  • Est. Priority Date: 07/26/2000
  • Status: Active Grant
First Claim
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1. A magnetic clamping system for a mold of an injection molding machine, comprising:

  • a magnet device having a clamping surface for engaging said mold at a clamping interface;

    a plurality of switchable permanent electromagnets on said magnet device for establishing a magnetic clamping force at said clamping interface, said electromagnets including a coil member;

    a movement detector sensor system operatively associated with at least one of said electromagnets and including first means for determining changes in magnetic flux conditions at said clamping interface and generating a first caution signal if a threshold value is exceeded;

    a permeability sensor system operatively associated with at least one of said electromagnets and including second means for determining changes in flux at said between a demagnetized condition and a magnetized condition and generating a second caution signal if said threshold value is not attained; and

    controller means for receiving said caution signals and determining continued activity of said injection molding machine based thereon.

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