Importance

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Abstract

This invention relates to a method and device for manufacturing plastic bags by transversely cutting and sealing a plastic web at spaced locations and, more particularly, to a method and device for operating a stacking device by means of a servo-motor. The servo-motor is coupled to a conveyor on which a plurality of pin stack elements are arranged. The servo-motor is also connected to a servo-controller which directs the operation of the servo-motor and coordinates the movement of the conveyor with the movement of a pair of draw rolls which draw the web through a cutting and sealing bar which forms individual bags. The bags are carried from the area of their formation by means of a wicketer to the pin stack elements on the conveyor. The servo-controller directs the draw rolls to cease drawing the web to prevent waste of bag production so that an arm of the wicketer, which will pass over the conveyor when the conveyor is being moved, does not carry a bag. The present invention also relates to a method for modifying an existing bag making machine by removing an independent motor coupled to the conveyor and installing a servo-motor connected to a servo-controller.

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First Claim