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Safety device for a kneading machine using rolls

  • US 5,921,367 A
  • Filed: 02/25/1997
  • Issued: 07/13/1999
  • Est. Priority Date: 03/01/1996
  • Status: Expired due to Term
First Claim
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1. A safety device for a kneading machine in which two laterally-juxtaposed rolls are disposed so that peripheral side faces of the rolls are close to each other and rotate in such a manner that movement of both of opposing peripheral side faces of the rolls are downward directed to thereby knead a rubber material, said safety device comprising:

  • a sensor, selected from a group consisting of a heat ray sensor and a photoelectric sensor, for detecting a physical quantity that is changed by entry of a hand of a worker into a region in the vicinity of a gap between the two rolls, wherein said sensor is a reflection-type sensor for irradiating the region in the vicinity of the gap between the two rolls with only substantially linearly-polarized irradiated light, and for receiving only substantially linearly-polarized received light from the region that is different in polarization direction from the irradiated light;

    a reflection member adapted to be attached to a hand of a worker of the kneading machine, that reflects the irradiated light and changes the polarization direction of the irradiated light to the polarization of the received light;

    judging means for judging whether a change of the physical quantity detected by said sensor exceeds a predetermined range; and

    operation stopping means for stopping operation of the kneading machine when said judging means judges that the change exceeds the predetermined range.

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