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Web notching control apparatus

  • US 4,820,251 A
  • Filed: 02/22/1988
  • Issued: 04/11/1989
  • Est. Priority Date: 02/22/1988
  • Status: Expired due to Fees
First Claim
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1. An edge notching control apparatus for actuating a rotating cutting head having a cutting member secured to an outer portion of the head for removing an edge material and forming a notch in a continuously moving web, comprising an indexing motor connected by a direct drive to said rotating head and providing for time spaced rotation of said cutting head,a controller connected to energize said indexing motor to gradually accelerate said cutting member to provide an essentially maximum velocity as the cutting member moves through the web and then to gradually decelerate said motor to a reference state,a bag making machine operating in continuous sequential bag making cycles for severing said web to form a series of corresponding bags with said notches located intermediate the width of the bag, drive means for moving said web through said bag making machine, a signal generator coupled to said bag making machine and generating a first control signal for each bag making cycle, said control signal being created in phased relation to the length of the bag moving through said cutting head to locate said notch in the same location in said bag making machine, web supply means to supply said web to said cutting head at a selected tension and varying the length of material passing through said cutting head to maintain said tension, signal means coupled to the web for generating a second control signal in accordance with the actual length of web passing said cutting head, said web supply means and said bag making machine having periods in which the speed of moving said web is correspondingly changed, logic circuit means connected to transmit said first and second control signals to said control for actuating said indexing motor, and timing means connected to said logic circuit means and actuated during said periods to operably disable said first control signal and transmit said second control signal.

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