Abstract: An L-sealer apparatus in which the transverse arm portion of the pivotal pressure frame is provided with an adjustably-retractable cutting blade for alternatively forming bags having only three sealed sides thereof, with one side edge being left unsealed for subsequent closure by a twist-tie, and for alternatively forming conventional, completely sealed bags. A clamping element is provided for clamping the plastic film adjacent to the portion at which the cutting blade is to cut, in order to provide a clean cut. The plastic film is cut downstream or upstream of the portion being heat-sealed by the electrical heating wire provided with the transverse arm portion of the pressure frame.

Abstract: The apparatus for sequentially advancing a plurality of articles across a feed table to a work station includes an input station for receiving articles deposited on the feed table, a reciprocating pusher assembly adapted to engage and advance the articles across the feed table from the input station when driven in a forward direction and to disengage from the article when driven in reverse, and an air cylinder-piston drive mechanism for the pusher assembly whereby the length of stroke of the piston and the pusher assembly is selectively variable. The pusher assembly includes a plurality of removable pushers each of which is relocatable at varying intervals along the longitudinal axis of the pusher assembly, and a mechanism for laterally adjusting the position of the pusher assembly to maintain an in-line feed mode regardless of the width of the articles being advanced along the feed table.