Patent ID: 6588174
Filing Date: 2003-07-08
Classification: B65B

Abstract:
A packaging machine comprising:a tube forming device for forming a tube from a web bearing marks thereon with a pitch corresponding to the length of one container, a filling device for filling the tube with contents, and a container forming device for forming pillowlike containers by sealing and severing the filled tube transversely thereof while transporting the tube a distance at a time which distance corresponds to the length of one container, the container forming device comprising a pair of openable flaps for folding a pair of triangular ears in forming the pillowlike container, a drive mechanism for opening the flaps to an adjustable degree and closing the flaps, and a web position matching system for controlling the drive mechanism so as to match the mark to a reference position, the drive mechanism having first and second fluid pressure cylinders, the first fluid pressure cylinder being operable to open the flaps to a first degree and close the flaps, the second fluid pressure cylinder being operable to open the flaps to a second degree resulting from the first degree by correction and close the flaps.