Patent ID: 6408599
Filing Date: 2002-06-25
Classification: B29C,B29K,B65B

Abstract:
A method of controlling a packaging machine, said packaging machine comprising means for causing an elongated film having detectable eye marks and defined cut-positions thereon to travel on a path, a pair of seal jaws for moving cyclically in part along said path to clamp and cut the film transversely to form separated bags and a detector for detecting the eye marks, said method comprising the steps of:moving the film on the path; starting to move said seal jaws when a specified travel condition becomes satisfied after one of the eye marks is detected by the detector; thereafter advancing the film to a clamping position and causing said film to be clamped at said clamping position between the seal jaws and cut along a cut-line on said film to thereby produce a dummy bag; and adjusting said specified travel condition according to the position of said cut-line to produce said dummy bag; wherein said adjusting step comprises the steps of measuring a distance of travel by the film from when one of the eye marks is detected by the detector until one of the cut-positions passes said clamping position; and calculating a timing for starting said seal jaws to move from initial positions therefor according to the measured distance of travel and setting said calculated timing for said seal jaws.