Arrangement for heating drying drums of drying machines

Claim 1

AN INSTALLATION FOR HEATING THE DRYING DRUM OF A DRYING APPARATUS FOR PHOTOGRAPHIC PRINTS, COMPRISING DRUM MEANS, A RELATIVELY FIXED SHAFT, MEANS FOR ROTATABLY SUPPORTING SAID DRUM MEANS ABOUT SAID SHAFT, DRYING CLOTH MEANS IN THE FORM OF AN ENDLESS BAND ABUTTING AGAINST SAID DRUM MEANS OVER A SECTION OF THE PERIPHERY THEREOF TO PRESS THE PRINTS AGAINST SAID DRUM MEANS, SAID BAND HAVING A PORTION FORMING AN ANGLE WITH THE LOWERMOST PORTION OF SAID SECTION, SAID DRYING CLOTH MEANS AND SAID DRUM MEANS MOVING IN THE SAME DIRECTION, SAID DRUM MEANS BEING CONSTRUCTED IN A LIQUID-TIGHT MANNER, MEANS FOR HEATING SAID DRUM MEANS IN A MANNER SUCH THAT THE TEMPERATURE OF SAID DRUM MEANS INCREASES IN DIRECTIONS UPWARDLY FROM SAID LOWERMOST PORTION TO THE UPPERMOST PORTION OF SAID SECTION, SPRAY MEANS DISPOSED ON THE INSIDE OF SAID DRUM MEANS FOR COVERING A PREDETERMINED SECTION OF THE DRUM CASING WITH A SPRAY OF A LIQUID HEAT CARRIER MAINTAINED AT ESSENTIALLY A PREDETERMINED TEMPERATURE, SAID SPRAY MEANS BEING DISPOSED BELOW AND ADJACENT THE TOP POINT OF SAID DRUM MEANS AND COMPRISING A SPRAY PIPE EXTENDING SUBSTANTIALLY PARALLEL TO THE LONGITUDINAL AXIS OF SAID DRUM MEANS, SAID SPRAY PIPE BEING PROVIDED ON TWO SIDES THEREOF WITH NOZZLE MEANS FOR ANGULARLY DISCHARGING SAID LIQUID HEAT CARRIER ON PERIPHERALLY SPACED PORTIONS OF THE INNER PERIPHERY OF SAID DRUM MEANS, AND SECURING MEANS FOR SECURING SAID SPRAY MEANS ON SAID SHAFT.