Patent ID: 6636153
Filing Date: 2003-10-21
Classification: B25B,B29C,H01F

Abstract:
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.