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Bag-making-and-filling packaging apparatus

  • US 4,754,593 A
  • Filed: 08/05/1987
  • Issued: 07/05/1988
  • Est. Priority Date: 12/28/1985
  • Status: Expired due to Term
First Claim
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1. A bag-making-and-filling apparatus in which a web supplied from a roll of packaging material is formed into a tube through a tube-forming member and intermittently delivered and the formed tube is filled with a material to be packaged when the filling is completed, the tube is sealed along the width thereof, comprising web delivery means disposed on a web-travelling path downstream of the forming member and measuring means disposed upstream of the delivery means and in direct contract with the web so as to be able to measure the actual run length of the web, said means for measuring the run length of the web being a non-driven rotary encoder and being rotatable in both forward and reverse directions at a speed corresponding to the speed of the web, said measuring means providing signals to a control system including a computer, said delivery means having a driving member which is started and stopped by said control system after a predetermined length of the web travel, said control system including a time lag sequence such that a predetermined length of the web is delivered after a counter is reset at zero by means of said time lag sequence and the counter begins to count in response to the direction of travel of the web;

  • the counter of the control system counting plus pulse at the forward rotation of the encoder and minus pulse at reverse rotation of the encoder.

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