A diaphragm deflectably spans and sealingly closes the open end of the chamber and urges {HEAD ~ the pressing roller} and thus the sheet material against {TAIL ~ the driven roller} with a force proportionate to the pressure prevailing in the chamber of the housing 
A diaphragm deflectably spans and sealingly closes the open end of the chamber and urges { HEAD ~ the pressing roller } and thus the sheet material against { TAIL ~ the driven roller } with a force proportionate to the pressure prevailing in the chamber of the housing
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH