Abstract: Documents are inserted into a bin beneath a document stack already in the bin. An air bearing holds the document stack above the floor of the bin. A lifting mechanism lifts the stack along one edge so that a document is driven between the last sheet in the stack and the floor of the bin. A selectively activated drive means positioned on the floor of the bin advances the document into proper registration into the bin. Documents can be fed from the top of the stack simultaneously with the bottom stacking operation.

Abstract: An electrophotographic copier having a recirculating automatic document feeder whereby a stack of original documents are top-fed, one at a time, to the copier's platen for copying, and after such copying, rejoin the stack by operation of means which cyclically lift the stack to enable the returning document to be deposited below the stack, and then lowers the stack to cause such a returned document to become the lowermost document of the stack.

Abstract: An electrophotographic copier with an endless photoconductor belt adapted to move around a cylindrical drum and a flat platen. A vacuum column is positioned between the cylindrical drum and the platen. The vacuum column creates a concave bend in the photoconductor, enabling a latent image of a document to be placed on a flat run of the photoconductor belt, and enabling charging, developing, transferring and cleaning of the photoconductor belt to occur about a curved run of the photoconductor belt.

Abstract: An improved apparatus for successively separating and feeding sheets from a stack of sheets is disclosed. A wave generator wheel, rotating in a plane generally parallel to the stack, and about a tiltable axis generally perpendicular to the stack, is tiltable in a first direction to contact the stack for shingling the stack, and in a second direction to contact the stack for restoring the stack to its unshingled state. Sheets in a stack are driven forward or rearward by simply tilting the rotating wheel. The wave generator wheel is used to first drive the stack's top sheet away from a feed nip, and to then drive the stack's top sheet into the feed nip.

Abstract: An electrophotographic copier having a cut sheet, two-bin, paper feed module which is selectively secured in copier-operative position, whereat it is operable to feed sheets to the copier's paper aligner and transfer station, or is removable to a copier-inoperative position whereat the module remains operative to feed sheets for the purpose of examination, analysis, and/or repair and maintenance of the paper feed module.

Abstract: A multibin, cut-sheet xerographic copier capable of operating in a simplex or a duplex mode, wherein sheets are fed from a selected sheet stack, one at a time, to the copier's transfer station, by a sheet feeding structure which includes a resilient combing wheel. The combing wheel is of a unique resilient construction, such that it exhibits a spring rate and damping factor which minimizes acoustical noise and enhances reliable, repeatable shingling of the top sheet of a stack to a closable sheet drive nip.

Abstract: A helical scan magnetic recording device is provided with a folded mounting plate in order to permit a tape wrap on the circumference of a tape support mandrel which is intermediate the conventional 180.degree. and 360.degree. tape wraps. Specifically, the device is provided with a folded mounting plate comprising a body having a substantially planar reference surface for supporting a tape entry guide and a non-parallel, substantially planar exit reference surface for supporting a tape exit guide. The two non-parallel surfaces are coupled together to define a V-block mounting support for the mandrel. In a preferred embodiment, the entry reference surface and the exit reference surface are each perpendicular to the directions of tape entry onto the mandrel and tape exit off the mandrel, respectively. In addition to permitting the use of intermediate tape wrap angles, this device provides a more efficient and compact structure and permits more precise mounting of critical device components.

Abstract: Parallelism between the track on magnetic tape and the path of the rotating head is dynamically adjusted and maintained by adjusting one or both of the entry or exit guides guiding the tape as it helically wraps a mandrel. The mandrel has two halves that flank the rotating head so that as the tape wraps the mandrel, the rotating head traverses the tape at an oblique angle. Skew error is represented by a lack of parallelism between the track on the tape and the path of the rotating head across the tape. The skew error may be corrected by laterally shifting either the entry or exit tape edge guide without distorting the track over a limited lateral range of movement by the guides. The entry and exit edge guides are continuouscompliant air-bearing guides. Similarly, the mandrel that supports the tape adjacent the rotating head is also air bearing.