Abstract: In a hot forming machine in which molding means deform a thermoplastic foil band and cutting and stamping means further process the deformed foil band. A photocell is adapted to scan marking indicia on the foil band and to adjust a lengthwise adjustable connecting member in accordance with such scanning. The connecting member forms part of an advancing arrangement for the transported foil band. This advancing arrangement includes a swing arm pivotally mounted in the machine; a first shaft mounted on the swing arm in proximity of the free end thereof; and an eccentric rigidly secured to the first shaft and pivotally connected to the connecting member which is also pivotally connected to the swing arm.