Siemens Aktiengesellschaft

Erich Baier

Bernhard Schlageter

Rainer Koefferlein

Hans Hahn

Rainer K/o/ Efferlein

Non-mechanical printer or copier means comprising an exposure means

Isorunning-counterrunning developer station for an electrophotographic

In a developer station for an electrophotographic printing or copying machine, there is provided apparatus which serves to assure a uniform layer thickness and density of developer mix to be conducted by the developer roller to the inking gap with a charge image carrier. This apparatus comprises a stripping roller which is mounted for rotation in the same direction as the developing roller and is arranged adjacent to the developing roller for defining therebetween a nip area through which developer mix must pass in route to the inking gap. The stripping roller serves to define an even level thickness for the developer mix being conducted to the inking gap by stripping away an upper portion of the developer mix layer for return to the main body of developer mix disposed in the lower region of the developer station. A guide plate is disposed beneath the striping roller about the lower end of the developer roller for defining a gap opening between its lead edge and the stripping roller. The excess developer mix stripped by the stripping roller passes through this gap opening for return to the station lower region. The gap is sized such that a small accumulation of excess mix particles develops at the inlet to the nip area for compressing the developer mix layer at this point and, thus, effecting a uniform density of the mix layer passing through the nip area onto the inking gap.

Device for adjusting the level of a developing mixture, which consists

In a developer station for an electrophotographic printing or copying machine, there is provided apparatus which affords effective intermixing of carrier and toner particles in the developer mix and which enables the developer mix to be removed from the station prior to replacement in an automatic and simplified fashion. Transport and developer rollers are mounted in the station for conducting developer mix from a supply chamber to communication with a charge image carrier. A pair of rotary screws are disposed in the station on one side of the rollers with conveyance directions opposite to one another for conducting developer mix back and forth through the station enabling fresh toner to blend into the developer mix and maintaining uniform mixing of toner and carrier particles of the mix. On the other side of the developer roller from the mixing screws, there is provided a guide plate assembly which receives developer mix spilled off the top of the developer drum after passing by the image carrier and conducts this spilled-off mix laterally through the housing toward one end of the housing. At this one end of the housing there is provided a discharge opening in the housing floor underlying the flow communication between the first screw receiving the fresh toner and the second screw disposed in the main body mix supply chamber. Overlying the discharge opening and extending between a stripper means acting upon the developer roller and the discharge opening is a discharge plate which serves to conduct stripped away developer mix particles into the discharge opening. For removal of developer mix from the station, particles are conveyed by the mixing screws, the developer and transport rollers, the guide plate assembly, and the discharge plate until substantially all of the developer mix contained in the station is passed into the discharge opening.

Magnetic brush developing station

A support assembly for the components of one or more operating units associated with an intermediate carrier of an electrostatic copier. The components are arranged in a carriage member which is slide supported on frame members of the copier to be movable axially of the intermediate carrier drum. The components within a carriage are supported for movement towards and away from the drum surface.

Support assembly for components of electrostatic copiers

A toner feeding assembly for feeding a developer mixture of a toner and carrier particles to an intermediate carrier which has been electrostatically charged, the feeder mechanism employing magnetic brushes of the rotating cylinder type, at least one of the brushes being adjacent the intermediate carrier. An excess toner deflecting guide member is positioned adjacent the magnetic brush-intermediate carrier nip having one long side edge projecting towards the nip and an opposite long side edge positioned away from the nip and below the one edge. The guide is effective to direct a film of developer mixture away from the nip area and back to a developer mixture reservoir.

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Suenzhausen, Germany

Erich Baier