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Magnetic substance holding device

  • US 9,969,061 B2
  • Filed: 03/05/2015
  • Issued: 05/15/2018
  • Est. Priority Date: 01/21/2015
  • Status: Active Grant
First Claim
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1. A magnetic substance holding device for holding and detaching a workpiece that is a magnetic substance, the device comprising:

  • a first pole piece assembly comprising at least one first pole piece having a first face and a second face, the first pole piece being a magnetic substance, at least two second pole pieces, each of the second pole pieces having a first face and a second face and being a magnetic substance, and at least two first permanent magnets, one of a N-pole and a S-pole of each of the first permanent magnets being in contact with the first pole piece while the other of the N-pole and the S-pole thereof being in contact with the second pole pieces, respectively;

    a second pole piece assembly comprising at least one third pole piece having a first face and a second face, the third pole piece being a magnetic substance, at least two fourth pole pieces, each of the fourth pole pieces having a first face and a second face and being a magnetic substance, and at least two second permanent magnets, each one pole of opposite polarity to that of the poles of the first permanent magnets in contact with the first pole piece is in contact with the third pole piece while the pole of same polarity as that of the poles of the first permanent magnets in contact with the first pole piece is in contact with the fourth pole pieces, respectively, wherein the first face of the third pole piece faces the second face of the first pole piece while the first face of each of the fourth pole pieces faces the second face of a respective one of the second pole pieces;

    at least one coil wound around at least one of the first pole piece or the third pole piece; and

    a control device controlling electric current applied to the coil,wherein at least one of the first pole piece assembly or the second pole piece assembly is configured to be movable such that the first pole piece assembly and the second pole piece assembly are switched between a first arrangement in which the second faces of the first pole piece assembly are spaced apart from the first faces of the second pole piece assembly, and a second arrangement in which the second faces of the first pole piece assembly come in contact with the first faces of the second pole piece assembly, andwherein the control device controls holding and detaching of a workpiece on and from the first faces of the first pole piece assembly or the second faces of the second pole piece assembly, by way of controlling electric current applied to the coil to switch between the first arrangement and the second arrangement.

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