Abstract: A bead pickoff device for removal of carrier beads adhering to a charge retentive surface subsequent to development of an electrostatic latent image with a developer mix including toner and carrier beads. A stationary magnet member supported within a rotating non-magnetic shell includes a permanent magnet supported in a ferromagnetic strip is provided with first and second sides disposed at an angle in the range of 70.degree. to 110.degree. with respect to each other. The first long side is supported with angled surface free end adjacent the charge retentive surface. The stationary magnet is seated on the second side, spaced from the first. The magnetic field is concentrated in the space between the magnet and the first side to provide an increased bead pickoff force at the charge retentive surface, while the field is attenuated to reduce the force of attraction on the beads as they move away from the charge retentive surface.

Abstract: Toner removal device for removing residual toner and debris from a charge retentive surface after transfer of toner images from the surface. This device is characterized by the use of a pair of electrically biased detoning rolls, one for removing toner from a biased cleaner brush for recirculation and use and the other for removing debris such as paper fibers and Kaolin from the brush. Placement of the detoning rolls is selected so that the brushes are located adjacent natural oscillation nodes of the brush, and closely spaced to the position where the cleaning brush leaves contact with the charge retentive surface. Cleaning blades for the detoning rolls are integrally provided with holders for insertion into receiving slots in the cleaning housing. Extrusion sleeves are provided for insertion into toner transport devices for removal for cleaning.

Abstract: Toner removal device for removing residual toner and debris from a charge retentive surface after transfer of toner images from the surface. This device is characterized by an integral extruded multi-vaned toner transport member for vertical removal of toner accumulated at a cleaning blade chiselingly removing toner from the charge retentive surface and transporting toner from the area about the blade to a augering transport device for transporting toner to a sump.

Abstract: Method and apparatus for processing a stream of image pixel data to determine the presence of high frequency half-tone data. The arrangement applies the function ##EQU1## to a stream of image pixel data. The presence of minimums of .phi.(k) at times indicative of predetermined half-tone image frequencies is detected and an output signal indicative of the presence or absence of minimums at the predetermined half-tone image frequencies is provided. More particularly, the two's complement of the stream of image pixel data is added to each of a plurality of differently delayed signals derived from the original stream of image pixel data. The absolute value is taken of the resulting function. The signal is summed for a selected number of pixels, corrected for noise, and reviewed for minimums. Minimums occurring at selected positions in the pixel stream indicate certain frequencies of the data. An output is created based on frequency indications.

Abstract: A voltage measuring device in an electrostatographic arrangement having a photoreceptor member charged to a uniform voltage level prior to imagewise discharge, and including at least a first corotron having a corona producing coronode driven with an A.C. voltage source for neutralizing charge on a surface in the electrostatographic arrangement. A thin conductive wire electrode is arranged parallel and across the photoreceptor surface and parallel to the coronode, to derive a current proportional to the voltage on the photoreceptor surface. Voltage measurements may be taken as a known function of the current derived in the electrode.

Abstract: A scorotron screen for use in a negative corona scorotron charging device comprises a beryllium copper alloy which reduces the problems associated with parking deletions in elecrophotographic process. The screen is fabricated by stamping from beryllium copper sheet metal. Heating the stamped member to a stress relieving temperature induces a tension on the member which enhances flatness.

Abstract: A voltage sensing device having a liquid crystal cell electrically connected to a charged surface and having a light transmissivity varying with applied voltage. A light source is directed through the liquid crystal cell, and a light detector, detects changes in the intensity of light directed through the cell and providing an output indicative of variations in voltage on the charged surface. Polarizers, which polarize light from the light source directed through the liquid crystal cell, and analyze light exiting the cell, convert electro-optically induced phase changes into intensity changes. A saturation level biasing voltage is periodically applied to the liquid crystal cell to set the cell to a reference level, clearing the cell of transient polarization effects. A second reference liquid crystal cell may be provided, electrically coupled to a reference voltage.

Abstract: A charging device provided with an integral arrangement for tensioning coronodes. The charging device is useful for mounting a double length prefabricated wire coronode having a predetermined length, and provided with coronode connectors at each end. The device includes first and second insulating end blocks supporting the coronode in charging position with respect to a surface to be charged, at least one of the end blocks adaptable for electrically connecting the coronode to a power supply, a coronode support member supported on the first end block for supporting a looped end of the coronode at the first end block and a coronode tensioning arrangement on the second end block, for applying tension to the coronode, including a pivot member for supporting the free ends of the coronode and mounted for pivoting movement between first and second positions.

Abstract: A scanning arrangement for supporting a device for scanning movement across a field, having a carriage supported for scanning movement through two parallel and co-planar U-shaped channels, each channel having upper and lower bearing surfaces, and an open side facing the opposite channel. The carriage is supported on a tri-roll bearing, including a rigid driver roll drivingly coupled to the axle member and in driving engagement with one of the bearing surfaces, and two rigid idler rollers, each in driven engagement with the driver roll and the other bearing surface, and maintained in non-contacting relationship, while provided with a spring force biasing the idler rolls toward one another.

Abstract: A scanner system for detecting images on a surface and generating an electronic representation thereof for transmission to an image processing system, including at least first, second and third rows of n sensors generating charges representative of detected light of preselected wavelengths during an integration period of a selected duration. Each row of sensors is comprised of substantially similar construction, and suitable for detection of a preselected wavelength, Sensors may be chosen from a sensor type which facilitates transfer of charges through the sensor.

Abstract: A dual mode raster input scanner to scan either or both sides of a moving document advancing along a paper path through a scanning station in a first mode, and to scan one side of a stationary document on a scanning platen in a second mode. A scanning station, for scanning in a first mode, includes two scanning elements supported closely adjacent each other and on either side of the document path for scanning substantially simultaneously both sides of a document. A scanning platen supports a document for scanning in a second mode. One of the scanning elements is supported in a scanning position closely adjacent the other scanning element during said first mode and for scanning movement past said scanning platen in said second mode. A single sheet document input is also provided for the supply of single sheets or computer fanfold webs.

Abstract: An improved transfer station baffle arrangement provided with first and second baffles, the first baffle provided with a curved sheet supporting surface imparting a bow to sheets passing thereby, the second baffle normally biasing the sheets against the first baffle, and biasable out of position with respect thereto. A flexible lip may be provided on the second baffle to absorb spring force energy in sheets passing through the baffle arrangement as the direction of sheet travel is changed.

Abstract: A reproduction machine for making copies from original documents includes a diagnostic system for examining the operation of the transport devices moving paper sheets through the paper path. Paper path sensors are located along the paper paths for sensing the passage of paper sheets as they are moved therethrough. A device clock generates information regarding the times of sheet passage past sensors. Data representative of machine operating time and corresponding to paper sheet passage past the sensors is stored in an addressable memory for a number of paper sheet passages. Upon indication of a fault condition, such as a paper jam, the data stored in the addressable memory is moved to a non-volatile memory. A device control and display are provided to access and manipulate the stored data.

Abstract: Method and apparatus for applying a periodic negative voltage to a coronode for the prevention of a streaming phenomenon in electrographic devices. A negative polarity voltage signal is applied periodically to the bare wire coronode of a positive corona charging device. The negative polarity voltage signal is believed to prevent the formation of streamer sites associated with the pepper tracking copy quality defect. The negative polarity voltage signal is applied to the coronode in a manner having a minimal effect on charging functions.

Abstract: A charging system for a reproduction machine is provided comprising a photoreceptor member having the property of dark injecting only a single side of mobile carrier from an injection layer; an alternating current voltage source operating at a frequency f; and a bias roller charging member electrically connected to the alternating current voltage source and comprised of a deformable conductive material supported in deforming engagement with the photoreceptor member during relative movement of the photoreceptor and the bias roller charging member. The bias roller is maintained in contact with any given area on the photoreceptor for a period greater than or equal to 1/f the bias roller charging member to provide uniform charging and avoid strobing.

Abstract: A method and apparatus is provided for making book style duplex copies from simplex originals with images having a top to bottom alignment oriented in the direction of sheet travel. Copy sheets bearing first side images are passed along a duplex path and stacked in a duplex tray. Prior to refeeding, the tray is rotated by 180.degree. in a single plane whereby the leading edge of said sheets becomes the trailing edge of the sheets upon being fed out form the duplex tray. The arrangement provides selectable pad style or book style copying. Sheets rotated in a side registered machine may be offset to provide correct registration with rotation.

Abstract: Method and apparatus for advancing two simplex documents from an input stack to a copying platen, for making a desired number of duplex copies therefrom. A first simplex document is advanced to a registration position, a second simplex document is subsequently advanced to a registration position with respect to the first document, and the documents thus registered are moved simultaneously to a copying position for sequential copying, and subsequent to scanning the documents a desired number of times to produce a number of copies, are moved to an output.

Abstract: A corona device comprising either a corotron or a scorotron for charging a surface is comprised of at least first and second complementary, interlocking pin array support members, at least one pin array member having integral pin projections and a power source extension member for connection to a high voltage power supply supported on and between the pin array support members, and a shield or screen member connected to a relatively low voltage, and supported externally on at least one of the pin array support members spaced from the pin array.

Abstract: A scorotron assembly for charging a photoconductive surface to a uniform potential comprises a pair of pin array coronodes having an array of projections extending towards a surface to be charged, a conductive screen, and a support arrangement supporting the screen between the pin array coronodes and a surface to be charged. To prevent the adsorption and subsequent desorption of corona effluents by conductive members of the scorotron, believed to cause photoreceptor deletion copy imperfections, the scorotron is provided with openings in said support member to allow the flow of air therethrough into the area between the screen, and the support members. The directional flow of ions flowing from the pin array coronodes towards the conductive screen generates a strong, substantially parallel air flow flowing therewith, and exhausting through the screen, aiding in the removal of corona effluents from the area.

Abstract: The transfer station of an electrostatographic apparatus includes a transfer corotron which assists the transfer of a developed image to a copy sheet. The shield of the transfer corotron is allowed to self-bias to a potential controlled by a Zener diode, and this potential is applied to a sheet guide member. Copy paper sheets are fed over a sheet guiding portion of the guide member towards the photoconductor drum, and while the sheets are in contact with the guide member they acquire the potential which is predetermined to ensure optimum transfer conditions.