Abstract: An apparatus in which a developer roller transports insulating developer material into contact with a flexible member in a development zone so as to develop a latent image recorded thereon. The flexible member is maintained at a preselected tension. In this way, the developer material being transported into contact with the latent image spaces the flexible member from the developer roller. The thickness of the layer of developer material on the developer roller is adjustable to control the spacing between the flexible member and the developer roller. In this way, development of solid areas and lines in the latent image may be optimized.

Abstract: An apparatus which maintains a moving belt in lateral alignment. The belt is supported so as to form an arcuate region therein. A guide engages the side edge of the belt in the arcuate region to prevent lateral movement thereof.

Abstract: An apparatus in which documents are moved in a recirculating path from a stack to an imaging station. Successive bottommost documents are fed from the stack to the imaging station with one side of the document being facedown for imaging. The document is transported from the imaging station simultaneously with the next successive document being fed thereto. After leaving the imaging station, the document returns to the top of the stack along one of two paths. One path returns the document to the top of the stack with the image side facedown. The other path returns the document to the top of the stack with the image side face up.

Abstract: An apparatus which controls the lateral alignment of a belt arranged to move in a pre-determined path. A pivotably mounted belt support is frictionally driven to move in unison with the belt. Lateral movement of the belt applies a frictional force on the belt support. The frictional force tilts the belt support in a direction so as to restore the belt to the predetermined path of movement.

Abstract: Apparatus in which a plurality of spaced apart magnetic members transport developer material from a supply thereof. The spaces between adjacent magnetic members enable extraneous developer material to pass therethrough and return to the storage supply thereof.

Abstract: An apparatus in which sheet material is decurled. The apparatus presses the sheet material into contact with a substantially rigid arcuate member in at least two regions. In this way, the sheet material moves about the arcuate member in a curved path to remove the curl therein.

Abstract: An apparatus in which developer material is guided to the free end regions of fibers to develop a latent image. The apparatus includes a tubular member having a ramp shaped member secured thereto for guiding the developer material to the fibers extending outwardly from the tubular member in the region of the latent image. An elongated magnetic member, disposed interiorly of the tubular member, rotates so as to transport developer material about the tubular member.

Abstract: An electrophotographic printing machine in which a single processing station performs the functions of cleaning a photoconductive member and developing an image recorded thereon. The magnetic field, in the region of the photoconductive member, is controlled so as to be weak during development and strong during cleaning.

Abstract: An apparatus in which toner particle concentration within a developer mixture and charging of the photoconductive surface are controlled. A first test area and a second test area are recorded on the photoconductive surface. Toner particles are deposited on the first test area having a greater density than the toner particles deposited on the second test area. Concentration of toner particles within the developer mixture is controlled in response to the toner particle density of the first test area. Charging of the photoconductive surface is regulated in response to the toner particle density of the second test area.

Abstract: An apparatus which develops a latent image by transporting developer material closely adjacent thereto. The apparatus includes a magnetic member having a magnetic portion formed integrally with a support portion.

Abstract: A printing machine in which a sheet is moved into communication with a marking station to establish visible representations of indicia thereon. After establishing indicia on one side of the sheet, the sheet is inverted so that the same leading edge of the sheet moves into communication with the marking station. As the other side of the sheet moves into communication with the marking station, visible representations of indicia are established thereon.

Abstract: An apparatus in which particles are dispensed from the open end of a chamber. A member is positioned interiorly of the chamber and periodically agitated in response to particles being dispensed therefrom. Agitation of the member prevents bridging and caking of the particles in the chamber and facilitates the flow of the particles therefrom.

Abstract: A magnetic member in which the magnetic portion thereof is magnetized to saturation impressing a plurality of magnetic poles thereon. At least one non-magnetic portion is integral with the magnetic portion so that the volume of magnetic material within the magnetic member varies producing a magnetic field having a preselected intensity profile. The magnetic member may be utilized in a development system or cleaning system of an electrophotographic printing machine.

Abstract: An apparatus which develops a latent image by advancing a conductive developer composition comprising marking particles into contact therewith. The apparatus interacts with the developer composition causing the developer composition to have higher and lower regions of conductivity. In the regions of higher conductivity, development of the solid areas within the latent image is optimized. Development of lines within the latent image is optimized in the regions of lower conductivity.

Abstract: An apparatus which develops a latent image by transporting a conductive developer material comprising marking particles into contact therewith successive times. During the first contact time, the conductivity of the developer material optimizes development of solid areas within the latent image with marking particles. The last contact time occurs with a developer material having a lower conductivity than the development material employed during the first contact time. In this way, development of lines within the latent image with marking particles is optimized during this latter contact time.

Abstract: An apparatus in which developer material is transported to a latent image so as to be deposited thereon to form a powder image thereof. The apparatus includes a mixer disposed interiorly of the transport, for mixing the developer material.

Abstract: An apparatus in which the lateral movement of a belt arranged to move along a pre-determined path is controlled. The apparatus includes a belt sensor mounted translatably on a belt support. As the belt moves laterally, the sensor translates therewith causing the belt support to pivot so as to return the belt to the pre-determined path.

Abstract: Disclosed are positive toners comprised of a toner resin, a colorant, or pigment, and an alkyl picolinium compound selected from the group consisting of those represented by the following formula: ##STR1## wherein A is an anion which in a preferred embodiment is a halide such as chloride, bromide, or iodide, sulphate, sulphonate, phosphate and nitrate, and R is a hydrocarbon radical containing from 8 to 22 carbon atoms and preferably from about 12 to 18 carbon atoms. These toners when combined with carrier materials can be used as developers in electrophotographic systems.

Abstract: An apparatus in which conductive developer material is transported into contact with a region of a surface having image areas recorded thereon. An electrical field is generated and the developer material develops the image areas. In one mode of operation, the electrical field is substantially perpendicular to the surface over one portion of the region and substantially non-perpendicular thereto over the remaining portion of the region. In another mode of operation, the electrical field is substantially perpendicular to the surface over the entire region.

Abstract: An apparatus in which a belt is supported by a fixed mounting and a movable mounting. In the operative position, the fixed mounting maintains at least a portion of the belt generally planar. During operation, the movable mounting deflects the planar portion of the belt to the operative position. In order to remove the belt, the movable mounting is returned to the inoperative position with the belt being undeflected. This facilitates removal of the belt from the mounting.