Patent ID: 9604426
Date: 2017-03-28
CPC Classifications: B26D,B31B

Claim:
1. A plastic bag making apparatus in which plastic films are fed intermittently and longitudinally thereof, the plastic films being heat sealed with each other by a heat sealer and then cut widthwise thereof by a cross cutter whenever being fed intermittently to successively make plastic bags of the plastic films, the apparatus comprising: a trimming cutter for trimming selvages off the plastic films while the plastic films are being fed or moving through the trimming cutter; and a drive by which the trimming cutter is moved along the plastic films and away from the selvages and then moved along the plastic films and toward the selvages whenever the plastic films are fed intermittently so that the plastic bags can be cut at corners by the trimming cutter with wastes kept being continuous with the selvages, wherein the trimming cutter is moved downstream for a distance when the plastic films are fed not to trim the selvages off the plastic films for the distance, the plastic films therefore including portions not subjected to trimming, the trimming cutter being returned to an original position when the plastic films are stopped, the original position comprising a position at which the trimming cutter is disposed to trim the selvages off the plastic films while the plastic films are being fed or moving through the trimming cutter, the trimming cutter being moved toward the original position and away from the selvages and then moved toward the original position and toward the selvages when being returned to the original position to make the plastic bags cut at corners with the wastes kept being continuous with the selvages.