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