Apparatus for drawing, a web through a synchronization section of a bag making machine

  • US 5,833,107 A
  • Filed: 03/04/1997
  • Issued: 11/10/1998
  • Est. Priority Date: 03/04/1997
  • Status: Expired due to Term
First Claim
Patent Images

1. An apparatus for drawing a pair of webs through a synchronization section of a split bag making machine, comprising:

  • a first primary split draw roller and a second primary split draw roller, each having first and second web contacting sections which are independently rotatable, the first section of the first primary split draw roller being in rolling engagement with the first section of the second primary split draw roller at a first nip through which a first one of the webs is adapted to pass, the second section of the first primary split draw roller being in rolling engagement with the second section of the second primary split draw roller at a second nip through which a second one of the webs is adapted to pass;

    a first secondary split draw roller positioned upstream of the first and second primary split draw rollers and over which the first and second webs are adapted to run, the first secondary split draw roller having a first web contacting section corresponding to the first web contacting sections of the first and second primary split draw rollers and having a second web contacting section corresponding to the second web contacting sections of the first and second primary split draw rollers, the first and second web contacting sections of the first secondary split draw roller being independently rotatable;

    a first transmission element coupling the first web contacting section of the first secondary split draw roller to the first web contacting section of the first primary split draw roller, such that rotation of the first web contacting section of the first primary split draw roller causes rotation of the first web contacting section of the first secondary split draw roller;

    a first servomotor coupled to the first web contacting section of one of the first primary split draw roller and the first secondary split draw roller;

    a second transmission element coupling the second web contacting section of the first secondary split draw roller to the second web contacting section of the first primary split draw roller, such that rotation of the second web contacting section of the first primary split draw roller causes rotation of the second web contacting section of the first secondary split draw roller; and

    a second servomotor coupled to the second web contacting section of one of the first primary split draw roller and the first secondary split draw roller.

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