Apparatus for manufacturing products of welded plastic sheets

A machine for manufacturing products formed of plastic film sheets, wherein said products are comprises of two overlaying plastic film sheets joined by a weld, said machine comprising a frame supporting a welding station for welding the sheets together and a separation station for cutting the welded sheets into individual products, a feed carriage for withdrawing the overlaying plastic sheets from a supply means, said feed carriage comprising a grasping device and being mounted on said frame from movement there along, a motor driving a drive shaft, said drive shaft carrying a lever supporting a cam roller disposed in a slot in said feed carriage extending transverse to the direction of movement of said feed carriage, so that said motor drives said feed carriage between a first position, in which said grasping device grips said plastic sheets, and a second position, in which said grasping device releases the plastic sheets, at least one pneumatic piston/-cylinder unit controlled by solenoid valve means for actuating said grasping device, a conveyor belt supporting said plastic sheets, a welding press and a cam driven by said drive shaft for activating said welding press, said cam being arranged such that said sheets are welded while said feed carriage returns from said second position to said first position.