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Device to control the feeding of the strap in a strapping machine

  • US 5,778,643 A
  • Filed: 03/14/1997
  • Issued: 07/14/1998
  • Est. Priority Date: 03/14/1996
  • Status: Expired due to Term
First Claim
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1. Device for controlling the feeding of a strap in a strapping machine, the device comprising:

  • at least one fast driving wheel and one slow driving wheel;

    each wheel having a periphery for guiding the strap thereon;

    said fast driving wheel and said slow driving wheel being mounted on fixed axes and rotated by respective drive shafts which are always active;

    said slow driving wheel being mounted on the respective drive shaft through a freewheel mechanism;

    pressure means for pressing the strap against the periphery of at least one of said driving wheels so as to insure feeding thereof;

    said pressure means being moved by an oscillating member operating in response to tensioning of the strap;

    said pressure means comprising a first and a second pressure element mounted on said oscillating member;

    a strap transmission wheel mounted on said oscillating member and located at a distance from said pressure elements to form an angle of deviation of the strap path, whereby during a recovery step, the strap contacts the fast driving wheel, and tensioning of the strap causes, by action on the transmission wheel, the member to oscillate and transfer the contact pressure of the strap from the fast driving wheel onto the slow driving wheel, merely through an alternative action of said pressure elements.

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