Apparatus for making plastic carrier bags

Details Apparatus for making plastic carrier bags Apparatus for making plastic carrier bags

B - Operations, Transporting

31

B

93/37

B31B 23/00 (2006.01) B31B 19/18 (2006.01)

Patent

CA 1237009

ABSTRACT OF THE DISCLOSURE In an apparatus for making plastics carrier bags from a web of tubular film of thermoplastic material, a feeding mecha- nism intermittently conveys the web by one bag width and a sever- ing mechanism cuts the web into half tubes along an undulating curve. A carriage displaceable in the machine frame transversely to the feeding direction of the web is reciprocated by a drive derived from a first rotating control cam through gearing. A cutting knife pivotable in the carriage about its longitudinal axis passes through the plane of the tube about an axis perpen- dicular thereto and is so controlled by an oscillating drive derived from a second rotating control cam that its edge is sub- stantially tangential to the undulating curve at the cutting point. A detour assembly retards one of the half-tubes to bring the bag side edge zones into phase and each half tube is formed into bags by a transverse sever-sealing device.

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