Patent ID: 6866077

Claim:
An automatic welding machine for planar plastic materials, comprising: a chassis ( 2 ) and, arranged thereon, a welding device ( 4 ), a driving unit ( 11 , 15 to 17 ), a pressure device ( 11 ) for the materials ( 8 , 9 ; 37 , 38 ) to be welded in an overlapping manner, wherein the chassis ( 2 , 32 ), in the welding position, in addition to being carried by the driving unit and the pressure device ( 11 , 15 to 17 ), is carried at least by one rigid guide wheel ( 7 ), the guide wheel ( 7 ), with respect to a pressure roller ( 11 ) of the pressure device ( 11 ) running essentially on the welded overlap region ( 30 ), being arranged in such a way that, during the welding, it runs along the bottom plastic material ( 9 , 38 ) parallel to the edge ( 21 ) of the top plastic material ( 8 , 37 ) thereby pressing into said bottom plastic material and guiding the welding machine.