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AssigneeSonoco Products Company
InventorsDavid C. Cannon, Stephen P. Lyles
Estimating the term…
Web treatment apparatus, such as a rotary die cutting machine, is provided with a die cylinder position encoder for generating pulses as the die cylinder rotates, feed roll position encoder for generating pulses as the feed rolls rotate; voltage dependent stored program driven servo drive for rotating the feed rolls; pull-off rolls for withdrawing web material from a supply roll and maintaining a storage loop thereof leading to the feed rolls; and a microprocessor based system including manually settable input for inputting the die length and length of pullback desired between cutting cycles. A position controller monitors die cutter speed and position from the die cylinder position encoder and provides voltage signals to the feed roll servo drive dependent upon the inputted data to provide velocity and acceleration profile for the feed rolls appropriate to the entered die length. It also provides a voltage signal to the pull-off roll drive to initialize the rate of input of web to the storage loop. A photocell detector system further adjusts pull-off roll drive speed to maintain the loop within preset limits. To maintain registration control, and to preserve synchronization of the feed roll servo with the die, the die cylinder may also generate a timing pulse on each revolution thereof.
System for operating web treatment apparatus, such as a high speed rotary die cutter, capable of accommodating dies of differing lengths on a die cylinder of fixed circumference and having feed roll means for feeding a web to be treated to said die cylinder for treatment thereby and for pulling such web back therefrom when such die is of a length less than the full circumference of said die cylinder and during non-engagement by said die, comprising:
Rotary web treatment apparatus, such as a high speed rotary die cutting, printing or embossing machine, provided with a die cylinder, die cylinder position encoder means for generating speed and position reference information as the die cylinder rotates, feed rolls, feed roll position encoder means for generating speed and position information as the feed rolls rotate;
Method for operating web treatment apparatus, such as a high speed rotary die cutter, capable of accommodating dies of differing lengths on a die cylinder of fixed circumference and having feed roll means and a stored program position controller and servo drive means therefor for feeding a web to be treated to said die cylinder for treatment thereby and for pulling such web back therefrom when such die is of a length less than the full circumference of said die cylinder and during non-engagement by said die, comprising:
Dependencies are inferred from the claim text.