Abstract: A magnet scanning device uses a helical scanning technique to scan a cylindrical magnet along a helical path on a cylindrical surface that corresponds to the cylindrical magnet. Based on the magnetic field profile, the device may detect any unacceptable irregularities in the magnetic field and identify a location of the cylindrical magnet associated with the irregularity.

Abstract: A developer camming apparatus connected to a developer unit, including a slide, a motor, and an encoder, wherein the encoder determines a distance a developer unit is from the photoreceptor, wherein the encoder allows the developer unit to be sufficiently close to effect application of toner to the photoreceptor from the developer unit, but also does not allow the developer unit to contact the photoreceptor during a print job.

Abstract: A magnet scanning device uses a helical scanning technique to scan a cylindrical magnet along a helical path on a cylindrical surface that corresponds to the cylindrical magnet. Based on the magnetic field profile, the device may detect any unacceptable irregularities in the magnetic field and identify a location of the cylindrical magnet associated with the irregularity.

Abstract: A developer unit for a color imaging system includes a housing, a developer roll, and a magnetic stripping roll. The housing defines a chamber for holding developer material, which includes toner particles. The developer roll is mounted in the housing and rotates to attract developer material to flow on its surface. The developer roll carries the developer material into proximity to a latent image to create a toner image. The magnetic stripping roll is mounted in the housing and rotates between a functional and a non-functional position in proximity to the developer roll to strip developer material from the surface of the developer roll, cleaning the developer roll. The magnetic stripping rolls may include a magnet assembly with a functional position for activating the magnetic stripping roll and a non-functional position for deactivating the magnetic stripping roll. The magnetic stripping roll may be mounted to shift between two positions.

Abstract: A developer camming apparatus connected to a developer unit, including a slide, a motor, and an encoder, wherein the encoder determines a distance a developer unit is from the photoreceptor, wherein the encoder allows the developer unit to be sufficiently close to effect application of toner to the photoreceptor from the developer unit, but also does not allow the developer unit to contact the photoreceptor during a print job.

Abstract: In a xerographic development apparatus using a magnetic brush formed from magnetic carrier particles, a magnetic strip disposed downstream of the development zone along the direction of motion of the photoreceptor retains a separate, small brush of carrier particles near the photoreceptor. The brush acts as a barrier separating a flow of “dirty” air (laden with airborne toner particles) upstream of the strip, and a flow of clean air downstream of the strip.

Abstract: In a xerographic development apparatus using a magnetic brush formed from magnetic carrier particles, a magnetic strip disposed downstream of the development zone along the direction of motion of the photoreceptor retains a separate, small brush of carrier particles near the photoreceptor. The brush acts as a barrier separating a flow of “dirty” air (laden with airborne toner particles) upstream of the strip, and a flow of clean air downstream of the strip.

Abstract: A printing apparatus includes a guide member for directing sheets toward a transfer zone. The guide member defines a set of ribs which hold the sheets above the main surface of the guide member. Thus, any stray marking material which lands on the guide member is relatively unlikely to contact a sheet moving over the guide member.

Abstract: A printing apparatus includes a guide member for directing sheets toward a transfer zone. The guide member defines a set of ribs which hold the sheets above the main surface of the guide member. Thus, any stray marking material which lands on the guide member is relatively unlikely to contact a sheet moving over the guide member.

Abstract: An apparatus and method are described for extending the life of a photoreceptor in xerographic printing. At a predetermined point in the life span of a photoreceptor, a correction circuit is interposed between the power supply and the charging device of the printer. Correction circuits of different designs can be selected to compensate for the photoreceptor properties at different stages of its useful life. The different correction circuits can be automatically activated over time, or can be retrofitted into a replaceable module when the replaceable module is remanufactured.

Abstract: A magnetic roll, such as for use in a xerographic printing apparatus, is formed from two semicylindrical partial cylinders. The partial cylinders can be molded and attached to each other to form a complete cylinder defining magnetic poles along the circumference thereof.

Abstract: A magnetic roll, such as for use in a xerographic printing apparatus, is formed from two semicylindrical partial cylinders. The partial cylinders can be molded and attached to each other to form a complete cylinder defining magnetic poles along the circumference thereof.

Abstract: A photoreceptor assembly and a xerographic cassette for a printing or copying machine, the cassette including a photoreceptor drum, a drum cleaner, a waste toner container, for storing waste toner; and a waste toner conveyor for conveying waste toner cleaned off said photoreceptor drum by the cleaner into the waste toner container characterized in that the waste toner container is positioned in the interior of the photoreceptor drum and is reversibly removable therefrom. The conveyor typically includes a flexible helical wire which acts as an auger. Once filled with waste toner, the waste toner container is removed from the drum and is replaced by a fresh container.

Abstract: An electrostatographic printer has a process unit adapted to be removably mounted in a main assembly of an electrostatographic reproducing machine, the process unit including a developement apparatus at which an electrostatic latent image is developed on an imaging member, and a transfer device which causes a developed toner image to be transferred from the moving imaging member to a copy sheet. The development apparatus is contained within a housing of an electrically insulating material, and comprises conductive means adjacent the exit portion of the development apparatus, i.e. the portion from which the imaging member emerges as it moves towards the transfer device. The conductive means includes a conductive coating on the exit portion of the developer housing, and a conductive seal member through which an electrical discharge path is provided.

Abstract: A sealing arrangement for a container in which an auger having vanes is disposed in the chamber thereof for moving particulate material stored therein. A threaded sealing member is adapted to engage the auger vanes so as to be driven along the container on rotation of the auger. The sealing member is mounted slidingly within the container but is restrained from rotating about the auger. On rotating the auger, in one direction, the sealing member moves along the auger to a storage position located beyond the auger vanes.

Abstract: A cylindrical magnet for a magnetic brush developer unit used in an electrophotographic printing machine is of U-shaped cross section having a cylindrical outer surface, and a cavity through which extends the rotary axis of the sleeve. The material forming the magnet is a moldable plastic containing a comminuted ferrite. The longitudinal, angularly spaced, poles are produced in the material during the molding operation. The magnetic body is bonded to end support members, and it is self-supporting between them.

Abstract: An apparatus in which flowing developer material is mixed. A plurality of spaced vanes project outwardly from a dividing plate to define a plurality of sets of chambers arranged in substantially parallel rows. Each chamber is arranged to receive developer material at an entrance aperture and to release the developer material from an exit aperture with the exit aperture being displaced from a position vertically below its entrance aperture. Each row has an alternate series of chambers with their exit apertures spaced respectively to the left and right of the position vertically below their entrance apertures. The entrance apertures and exit apertures of the chambers of different rows are aligned so that on successive recirculations of the developer material, the developer material moves simultaneously from left to right and from row to row, and from right to left and from row to row.

Abstract: A scanning optical system for a photocopier is mounted on a reciprocating carriage which travels between a start-of-scan and end-of-scan position. The carriage is engaged and driven by a drive transmission member which, in a preferred embodiment, is an endless belt having detents spaced along its length. The belt simultaneously drives the support for a photosensitive surface.