Abstract: A self-adhering stencil in which a heat sensitive bonding resin is disposed as a coating on the uncoated tissue or incorporated in the stencil layer or disposed as a coating on either or both sides of the stencil layer.

Abstract: A system for printing with ink droplets each having a known quantity of ink which system has a hydraulic portion including a main ink supply, a supplemental ink supply and a recirculating droplet generating print head and an electronic portion which includes a character generator for electrically characterizing each of the droplets so that they are directed either to a print target or to a dump and a monitoring means for identifying the droplets assigned to strike the print target and controls in the hydraulic portion for permitting a metered additional quantity of ink, depending on the number of print target directed droplets counted, to flow from the supplemental ink supply to the main ink supply, thus, allowing use of a standard ink formulation in the supplemental ink supply.

Abstract: An electrophotographic process and materials for the production of multi-color copies of a multi-color original in which an electrostatic charge is applied to a receptor sheet having a face portion subdivided into photoconductive segments containing sensitizing components in interspersed segments which cover different portions of the visible light spectrum and in which each such segment contains a solubilizable dye color corresponding to the color of the spectrum other than that to which the segment is sensitized and in which the exposed receptor is developed with a toner in which the dye component is soluble in response to toner activation for transfer of dye color from the developed receptor to copy sheets brought into surface contact therewith.

Abstract: A liquid composition for development of latent electrostatic images formed on an offset master for use in the production of multiple copies by offset duplication, in which the developer composition is formulated to contain a fatty acid amine, aromatic amine, heterocyclic amine or other aliphatic amine containing from 3 to 18 carbon atoms in the aliphatic group to obviate the undesirable effects from treatment of the imaged surface with a conversion solution.

Abstract: A master adapted to be imaged in the manner of an electronic stencil for use in producing multiple copies containing latent images in which the master comprises a base sheet having multiple coatings including a first coating containing an alcohol and/or water soluble colorless colorforming component and a highly electrically conductive coating overlying the first coat and which, in addition, contains a less highly electrically conductive coating overlying the highly electrically conductive coating and a masking coat as the top coat.

Abstract: A support for the stylus used in an electronic stencil cutting machine for burning or engraving information into stencil material mounted for relative movement with respect to said stylus, includes a t-shaped, blade-like body having a free end portion and a base portion, with the stylus being attached to the free end of the former. A second blade-like portion is affixed at a first end away from the base portion, to the free end portion of the body in an overlying relation, for dampening vibrations to the stylus as the latter passes over the stencil material and/or clamp for securing the material to a support surface. A support base upon which the blade-like body is mounted includes a pair of spaced members between which there is positioned a permanent magnet.

Abstract: A drive circuit for energizing the winding of a stepper motor includes a first amplifier circuit which receives a unipolar input signal and depending upon the amplitude couples a positive or negative voltage potential to one terminal of the winding. A second amplifier circuit also receives the input signal and applies the same polarity voltage potential to a differentiating circuit. The differentiating circuit operates a transistor switch to couple for a predetermined period of time, a voltage potential of opposite polarity but equal in magnitude to that coupled to the first terminal of the winding, to the second terminal thereof. The application of the double voltage to the winding causes a rapid torque buildup and great acceleration to the stepper motor for a short period of time. The differentiating circuit includes a capacitor having a predetermined time constant which controls the period of time the opposite polarity voltage potential is applied to the second terminal of the winding.

Abstract: This invention is addressed to a single color electrophotographic copy process in which a receptor having a photoconductive coating comprising a photoconductor, at least one sensitizer which sensitizes the photoconductor to at least a portion of the spectrum of visible light, a binder and a dispersed dye on the face thereof is charged and exposed to an original whereby the portion of the photoconductive coating corresponding to the non-imaged areas of the original are discharged leaving a latent electrostatic image on the receptor and then the exposed receptor is developed with a toner in the form of a material which, when in an activated state acts as a solvent or adhesive for the dispersed dye in the photoconductive coating for transfer of the dye color in the photoconductive coating in response to surface contact of the developed receptor with a copy sheet.

Abstract: An ink composition for jet printing onto non-porous-non-absorbent surfaces based upon a ketone solvent having a soluble ionizable salt and a dyestuff and which may contain in addition water in an amount up to 10% by weight, a lower alcohol in an amount up to 8% by weight, a pyrrolidone in an amount up to 4% by weight, a carbitol in an amount up to 4% by weight and a vinyl acetate copolymer resinous binder in an amount up to 6% by weight, the jet printing ink composition having a viscosity within the range of 1.5 to 10 cps, a resistance less than 2000 ohm-cm, a surface tension less than 28 dyne/cm, a velocity of sound within the range of 1200-1700 m/sec, and an upper limit of 5 microns and preferably 2 microns insolubles.

Abstract: In an ink jet printing system, there is provided an arrangement whereby the ink, which is not used in printing, may be returned to the reservoir from which it was withdrawn, together with fresh ink, in a manner so that ink pressure fluctuations, together with shutdowns for filling the reservoir are avoided.

Abstract: An apparatus and method for sensing and controlling the concentration of toner in a developer mix comprising toner and carrier particles used to develop electrostatic images on a photoconductive or the like member includes the provision of a surface which is electrically insulated from the toner and carrier housing and is triboelectrically dissimilar from the developer mix. The developer mix is flowed over the surface and a corresponding direct current voltage is generated triboelectrically due to the interaction thereof. The direct current voltage is connected through resistance to the housing and the direct current flowing through the resistance is related to the concentration of toner in the developer mix. Apparatus responsive to a predetermined current generated is employed to control the replenishment of toner to the developer mix.

Abstract: A liquid developer for producing an ink receptive, water repellent, oleophilic image suitable for use in the production of multiple copies by lithographic technique wherein the toner employed in the developer composition has precipitated thereon the polyvinyl acetate binder component.

Abstract: A liquid developer for treatment to convert a latent electrostatic image to an ink receptive, water repellent, oleophilic image for use in the production of multiple copies by lithographic technique in which, in addition to the toner particles and organic solvent, the developer contains a polyvinyl acetate as a binder and a hydrophobic colloidal silica in the ratio of 1 part silica to 1.5 to 4 parts binder whereby the oleophilic properties of the image are markedly improved.

Abstract: A system for the preparing of copy containing concealed images and a marking material for the development of same in which the components comprise a receiving material in the form of starch or polyvinyl alcohol, an iodide which is oxidizable to iodine, and an oxidizing agent for oxidizing the iodide in which the oxidizing agent is contained in the imaging material to produce the concealed image, the iodine is contained in the marking material for the development of the image and the starch or polyvinyl alcohol are contained in the copy sheet, the printing material or the marking material whereby, when the marking material is applied to the concealed image, the oxidizing agent oxidizes the iodide to release iodine for producing an intense color with the starch or polyvinyl alcohol and in which the printing process is adapted to conventional printing systems.

Abstract: An element for use as a teaching, examination and instructional material formed of a sheet having a visible image imprinted thereon and coded images keyed to the visible image in which the coded images are formed with a material, such as liquid crystals, which changes in appearance in response to temperature and in which the material in one of the images has a different temperature response than the material in the others of the images whereby the sheet is capable of multiple use as a teaching, examination and instructional element.

Abstract: A combination master/blanket printing sheet for use with a lithographic offset duplicating press includes a master layer comprising material having hydrophilic properties which is imagable to provide pre-selected oleophilic areas for receipt of printing inks and a blanket layer of hydrophobic-oleophilic material suitable for receiving and carrying thereon an inked image transferred thereto by contact with a member carrying such image. In a preferred embodiment of the printing sheet the master and blanket layers are applied by coating or other suitable techniques to opposite surfaces of a base or support layer. The printing sheet is usable in the offset printing process both as a "master" sheet, when properly imaged on the master layer, and a "blanket".

Abstract: An ink composition for printing onto the surfaces of glass or other glazed ceramic surfaces by jet printing in which the preferred formulation for the printing ink composition comprises 2 - 20% by weight of a linear novolac resin, 0.6 - 3% by weight of an alcohol or water and alcohol soluble dyestuff, 3 - 7% by weight of an evaporation retardant in the form of a glycol ether or glycol ester, with the remainder water and alcohol, with the water present in an amount up to 50% by weight of the alcohol and which may contain a soluble ionizable salt when the electrical resistivity of the ink composition exceeds 2000 ohm/cm.

Abstract: A vacuum return ink system for an ink jet printing apparatus includes an ink/air separator comprising a housing having a chamber formed therein. A first inlet port of relatively large diameter connects the chamber via a short tube of similar diameter to the ink catcher of the printing apparatus used for accumulating unused ink. A second port of relatively large diameter is provided to connect the chamber via a tube of a similar diameter to a vacuum source. A third port of relatively small diameter is provided to connect the chamber via a tube of similar diameter to an evacuated ink return tank. A tubular section defining the third port is inserted into the housing with the end thereof extending to the floor of the chamber. Ink and air are drawn from the catcher into the chamber via the first port at a high rate of flow, thereby minimizing a buildup of ink at the catcher mouth.

Abstract: Stencil cutting apparatus for electrically burning information from an original document into a stencil material having non-linear burning characteristics by the application of electrical pulses to a stylus contacting the stencil material positioned on a rotatable cylinder, includes a photomultiplier for scanning the original document and providing an output signal the amplitude of which is proportional to the light reflected by the information thereon, a circuit including a square wave oscillator and wave shaping network which alters the square wave in relation to the burning characteristics of the stencil material to produce a resultant train of pulses and a comparator circuit which adds the photomultiplier signal and train of pulses. The comparator provides output pulses having a width determined by the addition of the last-mentioned signal and pulses which are fed to the stylus for burning the stencil.

Abstract: A master cylinder for an offset or the like printing press includes an arcuate master receiving surface extension section mounted on the cylinder for movement between an inoperative position into the interior of the cylinder and an operative position adjacent the tail end of the stationary master receiving surface of the cylinder. When in the operative position the extension section increases the length of the master sheet receiving surface of the cylinder to accommodate longer than "standard" length master sheets. The extension section is mounted for sliding movement on arcuate guides formed by the movement of a predetermined radius extending from a point off center with respect to the central axis of the cylinder. A locking assembly is included to secure the section in either position. A tail clamp for longer masters is provided on the free end of the extension section.