Device for the welding of plastic foil

A device for the welding of plastic foils after they are moved into edge overlapping relationship adjacent a heating device for the heating of the foil parts to be welded together, comprising:

• a carrier;
• a draw spring acting on said carrier;
• a pair of a first fixed and a second movable pressure roll for the creation of a welding pressure and between which the foil parts to be joined are moved, said second pressure roll being mounted to said carrier, said carrier being movable between said second pressure roll and relative to said first pressure roll for adjustment in the width of a gap;
• a spring mechanism;
• a pressure device supported on said spring mechanism, said pressure device including a first regulating mechanism for setting of the width of the overlapping gap while said spring mechanism is relaxed, and a second regulating mechanism for regulating the welding pressure said second regulating mechanism being arranged on said first regulating mechanism and being movable with said first regulating mechanism each of said regulating mechanisms having an eccentric element provided for said regulation, one of said eccentric elements comprising a hollow eccentric shaft, a regulating shaft connected with the other of said eccentric elements being located in said hollow eccentric shaft.