Abstract: This invention relates to an improvement in an arrangement for ammonia feed in copying equipment with several switchable adsorption vessels, for instance four or five vessels, containing an adsorbent, at least one adsorption vessel of which in each case, the adsorbent of which is not saturated with ammonia, is charged with ammonia-containing air extracted from a developing chamber before this air leaves the copying equipment as cleaned exhaust air, and at least one adsorption vessel of which after saturation of the adsorbent can be regenerated by heating, and means whereby the liberated ammonia can be fed to the developing chamber.Each adsorption vessel can be connected via respective means to a line for the air extracted from pre-chambers of the developing chamber. The respective means are actuated according to a step-by-step switch unit. Furthermore, each adsorption vessel includes a gas outlet which can be either connected to the developing chamber or to an exhaust air line.

Abstract: This invention relates to an improvement in an apparatus for ammonia feed in copying equipment with a cold trap, for freezing out ammonia and water from air extracted from the immediate vicinity of a developing chamber, in particular from pre-chambers, together with a rectifying column for releasing ammonia from the frozen-out ammonia-water mixture and recycling the gaseous ammonia into the developing chamber, the improvement comprising heat exchanger means,With two heat-conducting channels adjacent each other through which the extracted air flows counter-currently, a cold source inSaid heat exchanger means, said source being at a transition position between said channels and surrounded thereby, heat source meansAdapted to heat said heat exchanger means, outlet means on said heat exchanger means, means connecting said outlet means on said heat exchanger means to said rectifying column, and means connecting said rectifying column to said developing chamber.

Abstract: This invention relates to a process for conducting ammonia in a diazo copying machine which comprises passing ammonia-containing exhaust air by first conduit means from a developing station of said copying machine through a cooled heat exchanger in which the ammonia and water is frozen out, then heating said heat exchanger to a temperature at which the water and the ammonia are liquified, passing the mixture of liquified water and liquified ammonia to a releasing station, adding fresh ammonia water to the liquified water and to the liquified ammonia, passing it together with the liquified water and liquified ammonia in the releasing station counter-currently to vapor produced by a vapor-generating means, and conducting the gaseous ammonia to the developing station, said process employing two heat exchangers, the first heat exchanger through which the exhaust air is passed being cooled and the second heat exchanger being heated for liquifying the ammonia and water frozen out during the preceding process step,

Abstract: An apparatus for developing photosensitive material with a gaseous medium comprising a housing having a developing chamber therein, at least one rotor in said developing chamber, said rotor extending over substantially the entire width of material to be developed and being mounted at a distance of about 0.05 to 20 mm from the material to be developed, a device for introducing gaseous developer medium between the rotor and the interior walls of said chamber, and a device for passing material to be developed through the apparatus, whereby it contacts said gaseous developer medium.

Abstract: A conveyor belt for use in electrophotographic copying apparatus, which conveyor belt has a plurality of apertures therein and comprises electrically insulating material that can be electrostatically charged, the size and the distribution of the apertures being such that sheet material on which a copy is to be produced can adhere by electrostatic attraction to the belt when the belt is installed in the apparatus and such that the tendency of the belt to impair the copy is less than that for a belt without apertures.