Abstract: A retractable in-line inking/coating apparatus can apply either spot or overall inking/coating material to a plate and/or a blanket on the first printing unit or on any consecutive printing unit of any rotary offset printing press. The inking/coating apparatus is pivotally mounted within the conventional dampener space of any lithographic printing unit. The aqueous component of the flexographic printing ink or aqueous coating material is evaporated and dried by high velocity, hot air dryers and high performance heat and moisture extractors so that the aqueous or flexographic ink or coating material on a freshly printed or coated sheet is dry and can be dry-trapped on the next printing unit.
October 2, 1995
Date of Patent:
September 12, 2000
Howard W. DeMoore
Howard W. DeMoore, Ronald M. Rendleman, John W. Bird
Abstract: An ink supply unit of a keyless printing press is capable of preventing leakage of an ink while printing is interrupted. The ink supply unit includes a movable blade provided between the both side plates in integral form, inclined descending toward a tip end side, supported on a base for movement toward and away from the peripheral surface of the fountain roller, driving means for driving the movable blade between a position where a tip end of the movable blade contacts to the peripheral surface of the fountain roller and a predetermined position where the tip end of the movable blade is located away from the peripheral surface of the fountain roller, and guide means coupled with the movable blade and guiding the movable blade so that the tip end of the movable blade moves with respect to the peripheral surface of the fountain roller with maintaining a predetermined attitude.
Abstract: An inking device for a printing machine, which has both a nip pressure adjusting mechanism, adjustable from the outside during the running of the machine, and a follow-up mechanism of a nip pressure to a movement of a plate cylinder and increase a degree of freedom in handling each member for the inking device enable the setting thereof to be easier. The inking device is equipped with two supporting levers 14 which rotatably supports the second and third form rollers 13b and 13c and are usually biased by compression coil springs 23 to push the second and third form rollers 13b and 13c against a plate cylinder 4, and two rolling member supporting levers 25 supporting a bearing roller 27 to contact a roller-lifting cam 7 and another bearing roller 27 to contact a plate cylinder follow-up cam 6 supported by the second eccentric bearing 2, wherein each of the supporting levers 14 and each of the rolling member supporting levers 25 are interconnected by a screw rod 29.
Abstract: A process for a web-fed rotary printing machine and, in particular, a process for pre-inking an inking mechanism. The inking mechanism is cleaned when all other rotating parts of the printing machine are standing still, even with an inserted printing web. Ink residues are removed from the inking mechanism by a washing device, until a defined starting state is reached. The inking mechanism is then newly inked in accordance with subject-specific instructions, i.e., in accordance with a print job to be printed. The inking is performed in parallel fashion during the start-up of the printing machine. Ink application rollers are positioned on a form cylinder when the form cylinder attains a predetermined rotational velocity.
September 8, 1998
Date of Patent:
May 2, 2000
MAN Roland Druckmaschinen AG
Martin Endisch, Bernhard Feller, Josef Gottling
Abstract: A sheet-fed rotary offset printing machine accomplishes multi-color printing. A central impression cylinder carries sheets to be printed as they pass by at least two serially located blanket cylinders. These blanket cylinders are provided with ink images from cooperating plate cylinders. A sheet is gripped only once by grippers of the impression cylinder and is held in this single gripping operation during printing. At least one short inking unit is associated with each printing cylinder.
Abstract: An inking device for inking a screen roller of a printing machine includes an ink supply device with an ink reservoir that are removable as one unit from the printing machine easily and without tools. The ink reservoir is separable from the ink supply device. The ink reservoir is filled using an ink cartridge. The printing ink is conveyed under pressure from the ink reservoir to the ink supply device in a supply line. The ink is pressed into the cups or hatchings of the inking device roller via the supply line by using a pump or a conveying roller.
Abstract: An ink fountain for rotary offset printing presses with an ink dosing device which includes of a plurality of zone-width dosing elements located next to one another in close proximity. The dosing elements have support and dosing areas, and the support areas are in constant direct or indirect contact under spring pressure with an ink fountain roller. The dosing areas can be adjusted to different ink gap thicknesses by rotating the dosing elements. The hydrodynamic forces or the spring pressure on the dosing elements can therefore be reduced.
Abstract: A printing apparatus for printing a printing-paper is provided with two plate cylinders each holding a plate, two blanket cylinders coming into contact with the plate cylinders respectively and a single impression cylinder coming into contact with these blanket cylinders. Each plate has two printing areas. The two plate cylinders and the two blanket cylinders have the same diameter, which is twice that of the impression cylinder. The impression cylinder is in contact with a feed cylinder and a removal cylinder, and a reverse cylinder is provided to be in contact with the feed cylinder and the removal cylinder. The printing apparatus performs printing corresponding to one of the printing areas of each plate on a single surface of the printing-paper, reverses the printing-paper, and performs printing corresponding to the remaining printing area of each plate on another surface of the printing-paper.
Abstract: An offset printing device is provided for a rotary printing machine having a plate cylinder carrying a dry flatbed printing plate, the printing device having an improved inking unit which reduces the occurrence and effect of contaminants. In the inking unit, at least one ink application roller, which is frictionally engaged against the plate cylinder during printing, is drivable by at least one positively driven inking roller at a peripheral speed which is different from the peripheral speed of the plate cylinder. In an embodiment, a plurality of ink application rollers contact the plate cylinder and are respectively driven at successively differing peripheral speeds.
Abstract: An automatic control apparatus in a printing press includes plate replacing units, an ink presetting portion, and a test printing control unit and a CPU. Each plate replacing unit mounts a printing plate on a circumferential surface of a plate cylinder. The ink presetting portion forms, in a roller group of an ink supply unit, an ink film thickness distribution corresponding to an image of the printing plate which is to be mounted on the plate cylinder. The test printing control unit and the CPU control the plate replacing units and the ink presetting portion to automatically perform, as a series of work steps, at least a mounting operation of mounting the printing plate on the plate cylinder and a forming operation of forming the ink film thickness distribution corresponding to the image of the printing plate.
Abstract: The invention is a system for a printing press which maintains the density of the colored ink put down on a moving paper web. The system includes a scanning device having a strobe light for illuminating a color patch in a color bar which runs transversely across the web, a camera for photographing the illuminated color patch and a step motor for moving the scanner incrementally across the web. Actuation of the scanner is timed through a microprocessor using input from an optical sensor and encoder. A signal is sent from the camera to a computer which determines the density of the color patch shot. A work station calculates how much the existing ink control console must be adjusted to maintain density and a command signal is sent from the work station to the console to effect the adjustment.
July 16, 1998
Date of Patent:
November 30, 1999
Perretta Graphics Corporation
Dominick J. DiBello, Thomas J. Ham, Jr., Bruce McKenna
Abstract: A coating head device for coating an engraved surface on a coating cylinder of a printing press having a main body with a longitudinal cavity for liquid, open to the coating cylinder and substantially sealable to the coating cylinder. The cavity has an injection zone providing for a zone pressurizing the liquid within a portion of said cavity in the main body to compel liquid into cells in the engraved surface of the coating cylinder. The main body has an inlet to provide liquid to the supply chamber and a return to exhaust liquid from the outlet section.
Abstract: In an ink film thickness control method, second ink film thickness distribution, corresponding to an image on an old printing plate, on a minimum first ink film thickness distribution formed on the surface of an ink roller group and required during printing, is removed for a predetermined one of printing units thereby leaving the first ink film thickness distribution. Which one of pre-inking I mode and pre-inking II mode is to be performed is set for each printing unit. The minimum first ink film thickness distribution required during printing is formed on the surface of the ink roller group of the printing unit set in the pre-inking I mode after a new printing plate is mounted in the printing unit set in the pre-inking I mode. The second ink film thickness distribution corresponding to the image of the new printing plate is superposed on the first ink film thickness distribution.
Abstract: An imprinter printing unit for a web fed rotary printing press comprises a first print couple including a first plate cylinder and an associated first blanket cylinder, a second print couple including a second plate cylinder and an associated second blanket cylinder, a first drive motor and a second drive motor. The printing unit further comprises a gear arrangement with axially movable gear wheels for operating the unit in a first mode of operation, in which the first drive motor drives the first print couple and the second drive motor independently drives the second print couple; a second mode of operation, in which the first drive motor commonly drives the first blanket cylinder and the second print couple; and in a third mode of operation, in which the second drive motor commonly drives the second blanket cylinder and the first print couple.
Abstract: A cassette for a wedge-shaped ink well of a printing machine has a bottom and a rear wall and two side walls. A front of the cassette, opposite the rear wall, faces a duct roller of the printing machine when the cassette is inserted into the ink well and is open. A handle connected to the upper portions of the side walls is positioned such that the cassette tends to incline to prevent ink from flowing out of the front of the cassette when the cassette is handled outside of the printing machine. The bottom and the sides of the cassette are sealed against the ink well adjacent to the duct roller. A seating arrests movement of the cassette relative to the ink well when the cassette is inserted in the ink well thus ensuring that the duct roller uniformly inked between sides of the ink well.
Abstract: An inking unit for a printing press, having a plurality of inking rollers for feeding a required ink quantity from an ink fountain to a printing plate, at least one of the inking rollers being additionally capable of performing an axial movement during a press run, includes a drive for driving the inking rollers axially via push rods and rocking levers, the drive including a drive wheel carrying an eccentrically disposed journal pin, and an uncouplable eccentric assigned to and cooperating with the journal pin.
Abstract: A continuous seal type lithographic dampener is fitted with a one-piece metering roller which has a continuous surface coating of flame sprayed (as by plasma arc) chromium oxide particles providing a porous surface which is filled with a pore occluding sealer. The resulting cylindrical surface is than ground to a finish in the order of 20 to 30 micro inches. A finish coat of sealer is applied to the surface of the roller. The resultant metering roller is highly wear resistant and hydrophobic, having a surface energy in the order of 30 to 40 dynes/cm.
Abstract: A flexographic unit printing assembly and method of printing a web of paper using the assembly eliminates the need for one or more flexographic units without eliminating the capability to effectively print certain jobs. At least one of the flexographic print units is provided with a print plate having distinctly different first and second portions, and a computer control has two nodes connected to the first flexographic print unit, one for sending a command telling the unit to print substantially the entire length of the print plate, and the other sending a command to the first flexographic print unit telling it to print the web only with the first print portion, and then to operatively (e.g. mechanically) disengage the print plate from the web.
Abstract: A flexible jacket covering is pre-stretched, pre-flattened and pre-cut to predetermined length and width dimensions for attachment onto a transfer cylinder. The flexible jacket covering is marked with alignment stripes and centering marks for faster, simpler and precise attachment of the flexible jacket covering onto the transfer cylinder in an operative position. A predetermined precise amount of movement or looseness of the pre-fabricated flexible jacket covering relative to the transfer cylinder support surface is established in the operative position. Reinforcement strips are stitched onto the gripper, the tail and the operator/gear side edges of the flexible jacket covering for stabilizing the flexible jacket covering and preventing detachment from the transfer cylinder during high speed press operation. At least one side of each reinforcement strip has pressure sensitive adhesive for securing the flexible jacket covering onto the transfer cylinder.
May 7, 1996
Date of Patent:
November 9, 1999
Howard Warren DeMoore, John Andrew Branson
Abstract: An inking arrangement for printing presses comprises an ink fountain member having at least one fountain-forming face for forming an ink fountain, an ink fountain roller defining an ink channel together with the fountain member and having an outer peripheral surface to be inked through the channel, a plurality of rollers for supplying the ink applied to the peripheral surface of the fountain roller to a printing portion, and a cleaning tank disposed below the fountain member. The cleaning tank is provided with a cleaning blade at least alternatively shiftable to a cleaning position in which the blade is pressed against the peripheral surface of the fountain roller, or to a stand-by position in which the blade is away from the fountain roller. The ink applied to the peripheral surface of the fountain roller through the channel is scraped off by the blade in the cleaning position and collected in the tank.