Abstract: A document facing apparatus for reversing the face orientation of a document includes four substantially similar document folding modules, each having a document gripping and advancing portion and a folding portion. The gripping and advancing portion engages the document along a first longitudinal half portion, with substantially the other longitudinal half portion extending outwardly of the gripping and advancing portion, and advances the entire document through the folding module. The document folding portion engages the document along its other longitudinal half portion and folds the other longitudinal half portion of the document to a substantially 90.degree. angle relative to its initial orientation upon entering the document folding portion. Four document folding modules may be aligned in a given sequence such that a document passing therethrough will have its face orientation reversed.

Abstract: A diazo copy machine comprises a roll of diazo sensitized copy paper cradled between a pair of drive rollers above an exposure apparatus. The copy machine is activated by insertion of an original tracing sheet whereupon the copy paper and original are automatically fed in superimposed relation into the entrance of the exposure apparatus, with the leading edge of the copy paper being advanced by a programmable amount relative to the leading edge of the original. Upon exiting the exposure apparatus the superimposed sheets are directed to an automatic sheet separating apparatus which deflects and feeds the copy paper along a downward path to a developer and carries the original along an exit path out of the front of the copy machine. In the event that the two superimposed sheets both inadvertently enter the downward path, a fail-safe mode of operation is initiated for redirecting both sheets along the exit path.

Abstract: A copying machine such as a diazotype copier which uses developing reagents which produce fumes is provided with an economical attachment for scavenging any fugitive gas traces and passing them through a treatment cartridge. A manifold mounted in the machine housing has an insert strip with air access openings which can be sized to suit the requirements of a particular copying machine. An air conduit hose has a snap connection with the manifold and with one end of a blower housing the other end of which is attachable to and readily detachable from a unitary disposable supply package which is floor supported and supports the blower housing. The supply package includes a supply of gas generating development material in one portion, and in the other, a gas treatment cartridge of inexpensive disposable character which is so constructed as to pass incoming air down through a central tube and then upwardly through a tube-surrounding space containing gas treatment material and then into the surrounding atmosphere.

Abstract: In a developing apparatus for developing exposed copy sheets with liquid developer, which apparatus employs an applicator roll for the developer liquid and metering and pressure blades in contact with the applicator roll for controlling the development process, there is provided a wick for applying the developer liquid to the roll. Means is provided for moving the wick into and out of contact with the surface of the applicator roll so that the wick may be withdrawn whenever the apparatus is stopped in order to allow uniform drying of the roll surface to forestall the possibility of non uniform development treatment which otherwise might occur when the apparatus is next used.

Abstract: 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 migrate 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.

Abstract: A rotary receptacle for supplying electric power to a rotating power-using device includes a nonrotating housing separated into two compartments by a rotary insulating disk. Each face of the disk carries a brush which runs against the interior surface of a slip ring housed within the corresponding compartment and shaped and dimensioned so as to provide maximum spacing between each slip ring and the periphery of the insulating disk.

Abstract: In an elongate exposure assembly in a copying machine, an illumination cylinder is nested in an array of elongate rolls which cooperate with endless elastic belts to drive the cylinder and feed the originals and copy sheets around the same. The rolls are of minimum stiffness, but are nevertheless capable of acting to feed the sheets correctly by reason of one or more self-locating spreader plates arranged at appropriate positions along their lengths to hold the rolls locally in the proper relationship to each other. Each such plate is provided with a throat opening into the cylinder receiving opening to provide access for the sheets to be exposed.

Abstract: A roll for friction feeding copy paper in the developer section of diazo copying machines is constructed by roughening its surface to a degree which provides an RMS value of 150 to 350 microinches, and then subjecting the thus roughened surface to a hard coat anodizing treatment.

Abstract: A developer apparatus is provided for developing exposed diazotype copy sheets comprising an applicator roller, means for supplying liquid developer to the applicator roller, a metering blade for wiping excessive liquid from the applicator roller and a pressure blade for pressing a copy sheet against the surface of the applicator roller to transfer liquid from the applicator roller to the copy sheet to develop an image thereon. The metering and pressure blades are arranged for sliding movement between an inoperative position ineffective to develop the copy sheet and an operative position in pressure engagement with the applicator roller for developing the copy sheet. Cam and linkage control means is provided for sequentially moving the blades between the inoperative and operative positions under control of a manually operable actuating means.