Patent ID: 6042526
Filing Date: 2000-03-28
Classification: B31B,Y10S

Abstract:
A method of making the bottom of a flat tubular section; comprising the steps of:transporting a tubular section by a conveyor in an alignment transversely to a longitudinal direction of the conveyor;partially opening one end of the tubular section by a first suction unit;inserting one set of fingers into the partially open end of the tubular section;moving the one set of fingers in a first phase in a substantially linear horizontal motion toward an end position in which the spreading unit conforms to fold lines of a finished bag bottom;swinging the one set of fingers in a second phase from a substantially horizontal alignment into a substantially vertical position about a horizontal pivot axis by way of a compound motion in which a movement of the one set of fingers into the end position is superimposed by a movement into the vertical position, thereby forming the open bag bottom; andwithdrawing the one set of fingers from the bag bottom while maintaining the formed bag bottom in vertical disposition by means of a second suction unit for further processing.