Abstract: For use with a computer cluster having virtual memory logical devices associated therewith, a system and method for determining which of the virtual memory logical devices are shared devices and a computer cluster employing such system or method. The system includes: (1) a polling circuit that retrieves volume information from at least some of the virtual memory logical devices and (2) a matching circuit that determines which ones of the at least some of the virtual memory logical devices are shared devices as a function of the volume information.

Abstract: An apparatus for cleaning a rotatable cylindrical member such as a pressure roll of a fuser assembly includes an absorbent sheet having longitudinal sides joined at a seam and having a generally folded edge along a central longitudinal axis of the absorbent sheet. Rods disposed within the absorbent sheet support the absorbent sheet against the rotatable cylindrical member to clean the circumferential surface of the member as it rotates.

Abstract: A sheet handler for successively transporting sheet-like material units to and from processing stations in image processing devices such as printers, copiers, and scanners. The sheet handler includes an idler and driven cross-roller set. The rollers are preloaded so that a normal force exists between the rollers at the nip. The nip is positioned in a path for receiving the sheet like material units and to urge such units along the path and into alignment along a registration edge. Apparatus for adjusting the preloaded force are provided to thereby adjust the normal force on sheet-like material passing through the nip.

Abstract: An apparatus for transporting and tracking a belt arranged to move in a predetermined path and controlling lateral movement of the belt from the predetermined path includes a stationary non-rotating arcuate tracking shoe with a belt defining surface for supporting a belt including vertically oriented flanges at each side of said path defining surface and extending from said path defining surface outwardly to provide belt edge guides. An unconstrained slip belt is positioned between the tracking shoe and the belt. When driving the belt around the tracking shoe the velocity of the belt in the axial direction of the tracking shoe is zero when the belt touches an edge guide. Therefore, the friction force acting on the belt from the tracking shoe in the axial direction approaches zero, which helps to keep the total system force applied at the edge guide less than the minimum force necessary to produce buckling of the side of the belt.

Abstract: The invention includes a sheet feeding apparatus having a sheet pocket with a first end and a second end, rollers spaced a predetermined distance from the first end and including a plurality of sheet-feeder nips, one of the nips being an inlet nip for directing a sheet into the first end of the sheet pocket, and at least one other of the nips being an exit nip for directing a sheet out of the first end of the sheet pocket, and bypass rollers for selectively permitting a sheet to exit the sheet pocket via the second end thereof.

Abstract: A document registration guide as provided by mounting a retractable pattern bearing substrate beneath a glass document platen. The substrate operates in the manner of a window shade, presenting a plurality of document outlines which are visible to an operator during a pre-copy state. The operator can select the appropriate document outline pattern, and position the document to be exposed along the outline ensuring the required and proper registration for that document. At start of scan, the substrate is retracted out of the document exposure area and is returned to its initial position at the end of the copying cycle.

Abstract: A apparatus in which lateral movement of a moving belt is controlled so that the belt moves in a predetermined path. The apparatus includes dual oppositely wound, helical springs having a rectangular cross-section with a high friction material extruded thereon. The springs are mounted on a shaft with an adhesive.

Abstract: In a so-called "scan-design" arrangement for testing integrated circuits, whether at the device level or at system level, problems associated with the storage and handling of vast amounts of data from increasingly complex devices are addressed by testing a pair of identical integrated circuits simultaneously and using the binary vector generated by scanning one of these integrated circuits as the reference against which to compare the binary vector produced by scanning the other integrated circuit. A plurality of "scan-designed" integrated circuits may be connected in series, possibly in a ring, and each compared with its predecessor. Zero-display coupling across each device may be employed to allow each successive integrated circuit to be compared with the same reference circuit in the chain or ring.

Abstract: A tri-directional inverter for use in machines requiring copy sheet inversion for collated copy set output uses four rollers forming three sheet-feeding nips. All sheets enter the center nip and contact a diverter gate that urges them in either of two directions. The sheets are corrugated by corrugating rollers as they enter a spring loaded inversion channel. The spring and corrugation rollers urge the sheets back out of the inversion channel into engagement with either of the selected other nips formed by the four rollers for feeding back into the machine for further processing.

Abstract: A testing circuit interfaces serially with the data path of an embedded memory circuit formed from at least one memory unit having separated data input and output lines and tandem addressing. Part of the testing circuit is a series of two-input multiplexer units which are adapted to be embedded on the same chip as the memory circuit. The outputs of the multiplexer units connect to a respective one of the data input lines of the memory circuit. Excepting the first bit position, a first input of each multiplexer unit is adapted to connect to the data output line of the adjacent bit position in the memory circuit. The second inputs of the multiplexer units are adapted to connect to the data bus of the chip. A further part of the testing circuit is a finite state machine which is adapted to connect to the first input of the multiplexer unit at the first bit position and to the data output line at the least bit position.

Abstract: In an electrophotographic device of the type including a belt-type charge retentive member, driven along an endless path through a series of image processing stations by a frictionally engaging driving member, including a blade cleaning station for removing residual toner and debris from the member after transfer of a toner image to a final substrate and an arrangement for controlling the driving member to selectively drive the charge retentive member in either direction along the endless path, so that the member may be occasionally back tracked to clear debris accumulating at the blade cleaner, the back tracking movement is controlled by provision of at least first and second sensor detectable indicia on the charge retentive member, spaced therealong at an interval equivalent to the desired back tracking distance.