DIAZO DEVELOPING APPARATUS

摘要

Developing apparatus for diazo copy sheets is provided wherein the development chamber is supplied with anhydrous ammonia gas drawn from the region above the liquid ammonia solution in a reservoir. The ammonia gas is withdrawn from the reservoir by a pump which moves it into the development chamber. Due to the gas inflow inspired by the pump, the gas mixture in the chamber is caused to nigrate out of the chamber by a return conduit whose outlet end is positioned below the surface of the liquid in the reservoir. The copy sheet transport means is a roll which occupies a mouth formed in a wall of the development chamber, and means are provided for effectively sealing the chamber contact margins against the roller to prevent escape of gas therefrom. The development chamber is arranged to snap over the roller and to be largely supported and positioned thereby. Means are also provided for forming and maintaining a pool of water in the chamber, and a heater within the transport roll aids in vaporizing the water to aid development while also guarding against undue moisture absorption by a copy sheet being developed.