Abstract: The line plastic bag machine comprises: first and second side walls; a plurality of rollers mounted between the side walls for receiving a web of plastic film that is trained through the machine over and around the rollers; a main drive motor; a main drive shaft driven by the main drive motor; the rollers including a main drive or chrome roller and a pair of spaced apart shuttle rollers mounted in a shuttle assembly; a drive train for driving from main chrome roller from the main drive shaft; the shuttle assembly being mounted for back and forth movement thereby to position an incremental width of the web of film traveling over the shuttle rollers in a momentary stationary position as the web of film is moving through the machine so that the incremental width of the film is momentarily stationery relative to the side walls; drive apparatus for moving the shuttle assembly; a perforating and sealing head which is movably mounted relative to the side walls for moving upwardly and downwardly over and relative to