Squeeze roll and actuator assembly utilizing inflatable bags

  • US 4,770,095 A
  • Filed: 08/17/1987
  • Issued: 09/13/1988
  • Est. Priority Date: 08/17/1987
  • Status: Expired due to Term
First Claim
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1. A roll assembly for sheet material comprising a support structure, a first elongated roll having opposite ends, a first means and a second means mounted on the support structure respectively engaging the opposite ends of the first roll for rotatably mounting the first roll in a stationary position with respect to the support structure, a second elongated roll having opposite ends, a third means and a fourth means mounted on the support structure respectively engaging the opposite ends of the second roll for rotatably mounting the second roll with the axis of elongation of the second roll disposed in the same plane as the axis of elongation of the first roll, the third means permitting translation of the second roll in said plane with respect to the first roll, a first means mounted on the support structure and coupled to the third rotatable mounting means for exerting a force on the second roll toward the first roll including a first bag having two spaced ends, one of said ends being anchored in a fixed position on the support structure and the other of the said ends being mechanically coupled to the third mounting means, said first bag having flexible elastic walls extending between the ends thereof and containing a fluid atmosphere at a pressure above atmospheric pressure, and the volume of the first bag being a direct function of the spacing between the ends of the first bag and a direct function of the fluid pressure within the first bag, whereby the insertion of an object between the first and second rolls results in decreasing the volume of the first bag and increasing the pressure of the gaseous atmosphere within the first bag to expand the volume of the first bag and compensate for the increase in pressure in the first bag, a second bag having two spaced ends, one of the ends of the second bag being anchored in a fixed position on the support structure and the other of said ends being mechanically coupled to the third mounting means, the second air bag containing a gaseous atmosphere and exerting a force on the second roll directed oppositely from the force of the first bag and of different magnitude.

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