Abstract: A method and apparatus for electronically mapping an updatable microfiche includes a microprocessor-based analyzer programmed to control and evaluate optical scanning of the imaging frame areas arranged in generally parallel rows and columns. Optical photosensors are used to detect the presence of a frame mark within an expected region of an imaged area. An electronic data mask retrievably stored in a mask table memory array is used to screen the output data from the sensors. The mask table is derived from relative sensor position data collected during a scanning operation on a calibrated microfiche. A look-up table memory array is used to store the results of an evaluation scan by storing which frames are imaged and which are available for imaging.

Abstract: A variable orientation ink catcher for use with ink jet printing equipment receives unused ink drops. The drops are returned to the printing system for reuse. The catcher includes an arcuate receiving portion offset from an outlet port. Caught ink flows by gravity from the receiving portion via a reservoir to the outlet port through a wide range of angular orientations.

Abstract: A method and apparatus are disclosed which provide feedback control of ink viscosity in a drop marking system. The ink flow between two selected points is monitored and compared against a reference value by an electronic controller such as a microprocessor. In the event that a flow time deviation is sensed, appropriate action is taken to change the flow time. A temperature sensor input to the controller permits temperature compensation to maintain ink composition substantially constant.

Abstract: A flow rate control system is disclosed for measurement of ink flow through an ink jet system. The flow rate control system receives an error signal indicative of deviation of flow rate from a set value. The system includes proportional (P), integral (I) and derivative (D) control to generate a control signal based on the magnitude and sign of the error signal. The control signal is used to control the on-time of an ink make-up valve which adds make-up ink to the system as ink is needed to maintain satisfactory operation. In a preferred embodiment, the PID controller has noise reduction capability through the use of clippers and low pass filters. In addition, conditional summation may be employed to minimize "hunting" at low error signal levels.

Abstract: A bridging roller is disposed between the upper form roller of the inking system and the dampening form roller of the dampening system. The bridging roller's mounting means are offset from the axis of rotation of the bridging roller such that selective orientation of the mounting means allows the system to be quickly and easily changed over between the integrated and segregated modes. In the dampening system the oscillating roller and form roller are supported on a pivotable support structure such that the dampening form roller can be moved out of engagement with the master cylinder and the oscillating roller can be simultaneously moved out of engagement with the metering roller to facilitate start up of the printer. When the rollers are in this start-up position the oscillating roller can be independently moved to a remote position to facilitate cleaning of the printer.

Abstract: An apparatus such as a printing apparatus employing an ink fountain assembly which includes a roller and metering blade, supported between housing walls for purposes of metering ink in the course of a printing operation. Seals are provided for sealing against leakage of ink in the region of the assembly where the roller ends are journalled for rotation. The seals comprise compressible, annular members mounted at each end of the roller. The seals define mating surfaces for engaging with mounting elements so that the seals are held against rotation as the printing operation takes place. The seals are compressed to provide a snug fit with the roller ends, and they define surfaces which develop a minimum of friction with these engaging roller ends.

Abstract: A circuit for signal generation and synchronization is disclosed for a ring network in which a number of stations communicate with each other. The circuit, which is provided at each station in the ring, includes a phase locked loop which loosely couples the transmit and receive clocks of each station during a repeater mode of operation. During a transmit mode the receive and transmit clocks are de-coupled so that phase delay around the ring does not degrade the transmit clock each time a transmission is initiated. The circuit includes logic gates for detecting the transmission of a token, means for generating a token and means for jam syncing the transmit and receive clocks to detect transistions in the incoming data during the repeater mode and after a token has been generated at the end of the transmit mode.

Abstract: An ink composition for use in ink-jet printing to print images on a substrate, the composition being formulated to include, as the resin component, a phenolic resole resin and, as the primary solvent, a lower alkanol. The composition is also formulated to contain a pigment or soluble basic dye, a resistivity control agent preferably in the form of hydroxylamine hydrochloride, an evaporation retardant, and a modifying resin. The use of a phenolic resole resin which is capable of undergoing cure on evaporation of the solvent provides a printed image having improved adherence to various printing substrates and can be formulated and dissolved in less toxic, lower alkanol solvents.

Abstract: A master sheet carrier which has a bar capable of holding the master sheet by clamping an end thereof, the bar being mounted on a mounting beam which is movable angularly and transversely with respect to the direction of movement of the master carrier, without requiring removal of the clamped master end, by manual operation of thumb nuts located to one side of the surface of the carrier over which the master is laid.

Abstract: A printing apparatus including separate serial printing heads mounted on a rotary chase whereby the heads can be selectively positioned for printing on material as the material is transported through the apparatus. The chase is mounted on a support located in an easily accessible position in the apparatus whereby the rotation of the chase to change the head or heads to be used in a printing operation can be easily accomplished. The chase is also removably positioned on the support so that an entire chase can be readily separated from the apparatus, and a different chase with different printing heads substituted in the apparatus. The chase is equipped with guides which cooperate with guides on the apparatus frame to insure automatic alignment of the chase as it is located in operating position, and the drive shafts carrying the printing heads are at the same time automatically engaged with drive means associated with the apparatus.

Abstract: An electrophotographic member having increased sensitivity to a longer wave length formulated of a complex formed by the reaction of Ninhydrin with a tertiary amine and which includes a polyalkenyl carbazole.

Abstract: A photoconductive layer embodies the combination of an organic photoconductive donor compound, such as poly(N-vinyl) carbazole and derivatives thereof, and an acceptor-sensitizer compound having the general formula ##STR1## in which M is a metal such as boron, aluminum, gallium, indium and thallium, X and Y are oxygen sulphur, nitrogen, phosphorus, antimony or selenium, Z.sub.1 and Z.sub.2 are halogen, or substituted or unsubstituted alkyl, alkaryl or heterocyclic groups, R.sub.1 and R.sub.2 are substituted or unsubstituted aryl, alkaryl, alkyl or alicyclic groups, and n is 2 or 3.

Abstract: An ambipolar electrophotographic plate and materials used in the manufacture thereof including a photoconductive layer formulated of selenium, selenium-arsenic alloy or selenium-arsenic-tellurium alloy containing indium as a dopant which extends the range for electrons without noticeable deterioration of the long range for holes.

Abstract: A pigmented ink composition for use in jet printing formulated of an aqueous or water-alcohol solvent system, a highly water dispersible white pigment limited to a particle size of less than 5 microns, a water dispersible resinous binder, a basic compound for maintaining a pH within the range of 7.5 to 9.5, and a plasticizer, and which may include in addition a coalescent agent and organic dye components for imparting color to the pigment.

Abstract: An ink return system for an ink jet printer which directs a portion of the ink projected from a nozzle to a print surface and the remainder to a catcher, the catcher having a receptacle entrance for intercepting the ink stream including a tube with an entrance to catch the ink stream and then convey the ink liquid along a flow path away from the catcher and a cowling adjacent the receptacle connected to a vacuum source to create a scavenging air flow at the tube entrance for ingesting ink mist without exposing the intercepted liquid ink to the relatively high rate of air flow necessary to sweep away the ink mist.

Abstract: Method of photopolymerization to produce vinyl based polymers and copolymers in the presence of a catalyst in the form of complex metal chelates.

Abstract: A method and apparatus for ink jet printing are disclosed which employ reverse charge coupling to increase character height. A video signal is utilized to modulate the charge ring voltage. Via a parallel path the ink in the nozzle is reversely charged by the video signal. Thus, as the ink drops are formed their electrical charge is greater than can be obtained under ordinary circumstances. This permits greater deflection of the drops resulting in larger characters on the printing media at the normal distance between media and nozzle or higher quality characters of the same size if the media is moved closer to the nozzle.

Abstract: A document carrier includes a transparent cover which is selectively wrapable about the periphery of the carrier for releasably sandwiching the document between the carrier periphery and the cover, the carrier being rotatable about an axis for advancing the document thereon past a stationary viewing station. A bypass document handler is also provided for receiving and advancing a document past the viewing station intermediately of the carrier and the station, wherein a microcomputer is responsive to rotation of the carrier for rendering the copying apparatus operable in synchronized relationship with the rotation of the carrier and/or the advancement of a document through the bypass document handler.

Abstract: A latent image-multiple copy process wherein use is made of a stencil in which stencil openings are formed to correspond to the latent image and base sheets in combination therewith, containing an invisible, soluble, color forming component, whereby when the color forming component is depleted from the base sheet in the area underlying the stencil openings, the base sheet can be replaced for the production of additional copies without the need to provide for a new stencil.

Abstract: A photoreceptor for producing copy in a full form exposure mode and in a laser mode in which the charge generative layer is overcoated with an intermediate charge transport layer which is transparent to light and through which charges can transport and a top layer overcoating the intermediate layer which is transparent to white light and absorptive and charge generative to laser light.