Abstract: A stencil printing drum includes a cylindrical circumferential wall which includes an ink permeable area and an ink impermeable area surrounding the ink permeable area. The wall is wrapped with a perforated stencil sheet and driven to rotate around a central axis of itself. The drum also includes an ink supply roller provided inside the wall for supplying ink to an inner surface of the wall. The roller presses ink outwardly from the ink permeable area to pass through a perforated area of the stencil sheet wrapped around the wall for printing. The drum also includes an ink impermeable projection. The projection is provided on a rear end portion of the ink permeable area in a rotating direction of the wall along one of the generatrices of the cylindrical wall. The projection projects inside the cylindrical wall, thereby dividing the ink permeable area and the ink impermeable area.

Abstract: A roller assembly is provided with openings in its outer surface for selective communication with a source of vacuum or a positive pressure. The openings may be angled along the roller rotational axis to impart a component of velocity to the paper perpendicular to the tangential roller surface velocity. Additionally, by selectively connecting the openings with sources of pressure and vacuum, enhanced paper alignment is achieved, multiple paper feeds eliminated, transitions between different velocities of rollers completed, or paper reverted so that printing can be achieved on first and second sides thereof.

Abstract: The invention provides an ink ribbon cartridge which ensures proper, reliable mounting of an ink ribbon. The ink ribbon cartridge of the invention includes a pair of spools, an ink ribbon including a band-like sheet wound around the pair of spools and provided with a layer of ink formed on one surface thereof, four spindles which have disk-shaped sections at one end and can be placed, for a specific length in both ends of the pair of spools, and a cover covering the pair of spools around which the sheet is wound and having four round holes in which the disk-shaped sections of each of the spindles are loosely fitted. In one of the four ends of the pair of spools, only the other end of a specific one of the four spindles can be inserted for a specific length, and one of the four round holes formed in the cover is formed such that only the disk-shaped section on one side of the specific spindle can be loosely fitted.

Abstract: A method and apparatus for cleaning a printing cylinder surface in a printing machine of strongly adhering dirt, such as paper dust and hardened printing ink. This is achieved by applying a predetermined coating of alkaline cleaning agent to the printing cylinder surface by a cleaning roller and allowing the cleaning agent to act on the surface for a defined time, preferably greater than sixty minutes, and then subsequently removing the cleaning agent from the printing cylinder surface by means of a cleaning fluid, such as water.

Abstract: A three-dimensional stacked electrical circuit assembly that uses spherical or cylindrical metallic contacts that are surface mounted to input and output pads of circuit substrates that contact recessed wire button contacts disposed in cavities formed in a nonmetallic spacer disposed between the substrates. Each metallic contact fits into a through hole in the spacer and makes contact with a separate wire button contact in the through hole of the spacer. The metallic contacts are recessed within the spacer and are protected from contamination and handling damage. Back-to-back spacers may be employed that use plungers to make contact between wire button contacts disposed therein. The wire button contacts are recessed in the through holes, which provides for an interconnect system having low contact resistance, high current capacity, low contact force, and the ability to customize the shape of the spacer.

Abstract: A method and apparatus for making a linear cut across stationary media in a printer, particularly applicable to rollfeed media.. A self-contained cutter assembly is activated by a printer carriage to move across a media path through a cutting zone and includes a first wheel-driven rotary cutter which acts cooperatively with a second passive rotary cutter to cut through the media. The first rotary cutter is driven by a concentrically mounted drive tire having a diameter less than the diameter of the first rotary cutter, and is generally positioned under the media path. The second rotary cutter rotates freely, and is generally positioned above the media path. A media guide member on the printer has an output flange with a lower surface for engagement with the drive tire and an upper surface to provide underlying support for the media adjacent the cutting zone.

Abstract: In order to seal the plug-in region between a relay and a plug base, a peripheral sealing ring is integrally formed in one piece on the dimensionally stable plastic of one part using the two-component injection-molding process. The sealing ring is elastically deformed by latching elements which engage one in the other, thereby providing the desired sealing of the arrangement.

Abstract: A circuit arrangement for a reversible image build-up of a surface matrix of a printing form for a printing machine, wherein the surface matrix has regions which are activatable and de-activatable by repeated triggering, includes a respective electrical circuit operatively associated with every region of the surface matrix activatable and de-activatable by the repeated triggering, at least one threshold value switch connected in each of the electrical circuits and having a switching state variable by the triggering for respectively activating and de-activating the region operatively associated therewith.

Abstract: A device for contact-free application of a liquid material to a substrate includes an application head with a nozzle for applying the liquid to the substrate. A web edge sensor determines the position of a longitudinal edge of the printing web and transmits an output signal representing that position to the application head via a control device or an adjusting device on an operating console. The adjusting device and control device provide manual or automatic adjustment of the position of the nozzle relative to the current position of the longitudinal edge.

Abstract: Dye cartridge adapted to reduce an exterior envelope of a printer and method of providing same. The printer comprises a housing having a front sidewall that has an aperture therethrough. A platen and a print head are disposed in the housing. The print head is movable from a first position spaced-apart from the platen to a second position adjacent the platen, such that the platen and the print head define a clearance therebetween when the print head is in the first position. A dye donor cartridge, which has an elongate neck portion defining a longitudinal axis therealong, is insertable through the aperture and into the housing to a position adjacent the print head. The neck portion, which is formed by a pair of spaced-apart parallel tines, is sized to be received through the clearance for interference-free insertion of the cartridge. Moreover, the cartridge includes a dye donor supply spool and also includes a dye donor take-up spool which is disposed in the neck portion.

Abstract: A multi-color single blanket printing press for printing single or dual webs includes a pair of blanket cylinders that are movable between a contacting position and a remote position. A plurality of plate cylinders associated with each blanket cylinder apply a multi-color image to each blanket cylinder. When the blanket cylinders are in the contacting position, a web passing through the nip will receive multi-color image on both sides. When the blanket cylinders are in the remote position, a pair of webs may be passed between secondary nips formed by the blanket cylinders and a pair of secondary impression cylinders. Each of the webs may therefore receive a multi-color image on one side.

Abstract: A new and improved thermal printing ink ribbon includes a heat-resistant base, a release layer disposed on the base including an ester wax and a rubber copolymer containing a specified aromatic monomer content and an ink layer disposed on the release layer by a solvent or hot-solvent process. The thermal printing ink ribbons exhibit satisfactory transferability even during high speed printing or after high temperature storage. The thermal printing ink ribbons are well suited for use in end face head-type printers.

Abstract: A method and system for printing bi-directionally with a thermal print head movable back and forth along a print path adjacent a ribbon to transfer ink therefrom onto a substrate. The ribbon being drawn from an unwind reel and adjacent the print path, and the ribbon being clamped to maintain tension on the ribbon at least when the print head moves in the same direction as ribbon is drawn along the print path. A rotary drive member is rotatable in a first direction to actuate a brake member that clamps the ribbon against a fixed ribbon guide, and the rotary drive member is rotatable in a second opposing direction to rotate the rewind reel to draw ribbon from the unwind reel.

Abstract: An apparatus and method for preventing condensation in machines for processing web-like material includes locating a condensation prevention device to reduce the amount of moisture near selected components to be protected and/or maintaining the surface temperature of components of a processing unit above the dew point of the surrounding air.

Abstract: An impact hammer assembly for a high speed printer includes first and second permanent magnets having opposite poles disposed adjacent to each other and having a gap therebetween. The magnets create flux lines extending across the gap. A print hammer includes a hammer beam and a hammer head. The print hammer is movable between a rest position and a print position. The hammer beam is disposed in the gap between the first and second magnets. A coil is disposed on the hammer beam and perpendicular to the magnetic flux lines. Circuitry generates a current in the coil and controls the direction of current flow in the coil, such that when current flows in the coil in a first direction, the print hammer moves towards the print position and when current flows in the coil in a second direction, opposite to the first direction, the print hammer moves towards the rest position.

Abstract: A printing machine with preferably several inking units, which are disposed on a common back-pressure cylinder (12), with in each case at least one roll body (16, 18), which is held with its two opposite ends in two bearing blocks (22, 24) that can be moved approximately radially with respect to the back-pressure cylinder, and is held with its one end in a hinged bearing (42), fastened to the bearing block (22) there, while it is clamped with its other end in a cantilever manner in a holding device (26), it being possible to move the holding device and the hinged bearing in such a manner relative to one another that, after the hinged bearing is lifted up, the roll body can be moved out of this bearing and then removed in an axial direction, characterized in that the hinged bearing (42), in the lifted-up state, is open in the direction of movement of the associated bearing block (22) and, by moving this bearing block in the direction approximately radial to the back-pressure cylinder (12), can be moved into th

Abstract: Disclosed are various embodiments of an ink roller assembly with a capillary ink metering unit and a surrounding porous ink retaining sleeve, wherein the unit is comprised of a pair of capillary sections connected to each other and wherein capillary sections include a hollow shaft and discs with intervening ink capillary chambers interconnected by passages. In another embodiment, a capillary ink metering unit includes discs on a solid shaft, wherein there are passages interconnecting capillary chambers.

Abstract: A system for monitoring the toner content in ink. The system comprising a light source and a photo-detector disposed in a ink chamber wall, a controller and a display unit. A content-monitoring voltage V1 and an operation-checking voltage V2 are determined from experiments in advance. V1 and V2 are such light source voltages when a predetermined current Ith is obtained from the photo-detector for the minimum and maximum allowable toner contents, respectively. In usual operation in user site, operation of the system is checked with the light source voltage set for V2 in response to a power-on or a reset. Then, a monitoring of the toner content is started with the light source voltage set for V1. In a toner content monitoring, the sensor current is checked to see if it is equal to or larger than Ith.

Abstract: A plurality of spring bases 50, 51 and 52 are provided to a tail edge side clamping base 76 independently. A pair of base convexes 51T are formed on both an upper surface and a lower surface of the spring base 51. A tension selecting part 70 comprising a first block 72 having a pair of block convexes 72T is provided at a position confronted with the spring base 51. The block convexes 72T and the base convexes 51T are contacted with each other by moving a lever 72L formed on an upper surface of the first block 72 when the plate 15 is fitted tightly on a cylinder surface of a plate cylinder 60 with low tension. The lever 72L is moved either in a direction of the arrow 100 or 101 when the plate 15 is fitted tightly on the cylinder surface of the plate cylinder 60 with high tension.

Abstract: An engraved picture bearing certificate comprising a specular-surfaced engraving sheet on which an original picture for identification, such as the photograph of face, a fingerprint, a signature, a logo or the like, is engraved by a graving tool of an engraving device. The specularly reflected light from the surface of the engraving sheet is visibly recognized as the engraved picture.