LINEA A CATENA PER MORSETTI DI SERRAGGIO A CIRCOLAZIONE CONTINUA IN TELAI DI SERRAGGIO PARTICOLARMENTE PER MACCHINE DI STIRO PER FILMTERMOPLASTICI E SIMILI

In a film stretching machine having tentering chains travelling in an endless loop, the forward advance tracks of the tentering chains are laterally adjustably arranged within the machine housing for adjusting to fit different material web widths and for adjusting the lateral or widthwise stretching ratio. The tentering chain reversal guide arrangements at the inlet and outlet ends of the machine are correspondingly laterally slidably adjustable. The return tracks for the tentering chains are arranged outside of the housing in a fixed position and orientation relative to the housing. Straight transition guide portions pivotally connect the stationary return chain tracks to connection points of the respective laterally movable reversal guide arrangement. The straight transition guide portions are each articulated at one end to the respective return chain track and at the other end to the respective reversal guide arrangement. The return chain tracks may be either open or completely closed channels.