Abstract: Apparatus including a recirculating feeder and document positioner is coupled to a copier. The copier has variable contrast and density controls. Ordinarily, the document positioner directly feeds document sheets seriatim to the recirculating feeder tray. However, if a document sheet requires copier contrast or density adjustments, the document sheet is stopped at the copier exposure platen, adjustments made to the contrast and density controls and a copy is made. Further adjustments and copies are made until a proof copy having an acceptable contrast and density is produced. The document sheet is then delivered to the tray. A memory stores the location in the document of each stopped document sheet and the proof copy adjustment information. When all document sheets are in the tray, then the recirculating feeder, copier and memory operate to produce a production run with each copy sheet having acceptable contrast and density.

Abstract: A fluorescent light concentrator is disclosed for flooding an electrophotographic photoconductor with light having spectral characteristics matched to those of the photoconductor to effectively discharge the photoconductor. In the disclosed embodiment, a single fluorescent light concentrator transmits light to two spaced locations to simultaneously discharge the photoconductor at such locations which may for example be prior to charging or sensitization and after image development.

Abstract: Apparatus including a recirculating feeder and document positioner is coupled to a copier. The copier has variable contrast and density controls. Ordinarily, the document positioner directly feeds document sheets seriatim to the recirculating feeder tray. However, if a document sheet requires copier contrast or density adjustments, the document sheet is stopped at the copier exposure platen, adjustments made to the contrast and density controls and a copy is made. Further adjustments and copiers are made until a proof copy having an acceptable contrast and density is produced. The document sheet is then delivered to the tray. A memory stores the location in the document of each stopped document sheet and the proof copy adjustment information. When all document sheets are in the tray, then the recirculating feeder, copier and memory operate to produce a production run with each copy sheet having acceptable contrast and density.