Device for drying printed sheets on offset printing presses

Claim 1

Device for drying printed sheets on an offset printing machine, comprising infrared radiators disposed above a delivery pile of the sheets and between an upper and a lower run of an endless delivery chain, said infrared radiators being substantially vertically displaceable transversely to said upper and lower means from a rest position into a working position thereof directly above the sheets, blowers displaceable substantially horizontally and parallel to said upper and said lower runs between a rest position thereof, which is located above the delivery pile of the sheets and intermediate said upper and said lower runs, and a working position thereof coinciding with said working position of said infrared radiators, first means for displacing said infrared radiators out of said working position thereof and into said rest position thereof, and second means for displacing said blowers individually from said rest position thereof into said working position thereof after said infrared heaters have been displaced into said rest position thereof whereby said infrared radiators are replaceable by individual ones of said blowers to change the mode of operation of the device.