Heidelberger Druckmaschinen Ag

Heidelberg Harris, Inc.

W. R. Grace Co.-conn.

Sun Chemical Corporation

Harris Graphics Corporation

Heidelberger Druckmaschinen

Heidelburg Harris, Inc.

Goss International Americas, Inc.

Robert Richard Murray

John Sheridan Richards

Roland Thomas Palmatier

Jackson Hacker Jones

Dale Hiett Jackson

Ronald Henry Boucher

Dan Alan Thomas

Ramasamy Krishnan

Richard J Wimberger

Richard B Mack

Marilyn C Yamat

Hugo Babij

Stephen Franklin

Stephen P Fraczek

Eugene J Bergeron

A method for modifying an image surface of a printing plate includes identifying a location of a pixel of an image at the image surface, an ink being disposed at the location of the pixel. The ink at the location of the pixel is then irradiated using a laser imaging system. The ink may be cured by the radiation so that it is hardened and useable to receive liquid ink and be used as a printing surface. The ink may be ablated and removed. Individual pixels of the image may be added or removed from the printing surface.

Method for modifying an image surface of a printing plate

A printing press comprises a cylinder having an outer surface and a plurality of air holes for providing air to the outer surface. A sound-damping material is located on a section of the outer surface and an axially-removable printing sleeve fits over the outer surface. Also disclosed is a method for reducing noise from a printing press comprising the steps of providing air through air holes in a cylinder having a free end to aid in placement or removal of an axially-removable printing sleeve, and providing a sound-damping surface to an outer surface of the cylinder at the free end.

Device for reducing printing sleeve noise

A variable-diameter cylindrically-shaped body includes a plurality of first tapered elements and a plurality of second tapered elements interacting with the first tapered elements and movable axially with respect to the first tapered elements. The first and second tapered elements define an outer surface of the body, with the outer surface having an effective diameter variable as a function of axial movement between the first and second tapered elements. The body has particular applicability in printing presses.

Variable-diameter cylindrically-shaped body

Method and device for reducing printing sleeve noise

A printing unit of a rotary printing press for using various ink types, particularly water-based inks, is provided. The printing unit includes an inking mechanism, a print cylinder, and a blanket cylinder. The inking mechanism and the cylinders are mounted in side walls of the printing unit. A housing at least partially surrounds the inking mechanism and the cylinders to maintain a surrounding atmosphere within an at least semi-enclosed area of the printing unit. A chemical agent may be selectively added to the atmosphere in the semi-enclosed area to reduce the rate of evaporation of a substance in the ink. The printing unit also includes a cooling unit for maintaining an ink carrying surface of one or more of the print form, the printing blanket, and the inking unit at a predetermined temperature which is suitable for printing with water-based inks. The printing unit may be a sheet-fed printing press.

Web- and sheet-fed printing unit using various ink types, particularly water-based inks

A lithographic printing plate comprises a plate body with a plurality of predetermined breaking points formed therein. The breaking points extend from a leading end to a trailing end of the printing plate. The predetermined breaking points define edges of sub-plates, each carrying an image which corresponds to a newspaper page of a newspaper to be printed with the lithographic printing plate. The printing plate can be mounted on the plate cylinder of a lithographic rotary printing press as one piece and can afterwards be broken up at the predetermined breaking points, in order to exchange one of the sub-plates against another sub-plate for a new print job, in case of an edition change.

Printing plate for a lithographic rotary printing press

A printing press includes an interchangeable plate cylinder, in which the plate cylinder may have variable cutoff diameters. The plate cylinder is mounted in the printing press in rolling contact with a fixed diameter blanket cylinder. The ink rollers of the inker mechanism may be positionally adjusted to accommodate a plate cylinder of various diameters. The surface of the printing blanket which is mounted on the blanket cylinder includes a material of low polarity surface energy, such as PTFE. The ink used in the press is selected such that, in combination with the PTFE of the blanket surface, the ink does not remain as a latent image on the blanket cylinder after transfer of the image from the blanket cylinder to a web of material.

Complete release blanket

A plate scanner-bending device having a plate bed for receiving a printing plate and a plate driver for moving the printing plate along the plate bed is disclosed. At least one scan sensor is located above the plate bed for scanning an image on the printing plate for density, along with at least one register sensor for sensing a register mark on the printing plate. The plate bed has at least one anvil at one end for a bending mechanism for bending the plate.

Plate scanner--bending device

An apparatus for preventing marking of a web which locally cools the web and thereby raises the viscosity of the ink imprinted thereon downstream of an initial cooling of the web. The cooling device may include liquid cooling of rolls in the press, air cooling of a contained environment of the press, or forcing a cooling gas onto a surface of the printed web.

Apparatus for reducing downstream marking including folder marking

A device for controlling the tension in a web of a printing press includes an adjustably positionable dancer roll coupled to an air cylinder. The dancer roll engages the web at a position subsequent to the chill exit nip rolls and prior to a next nip roll pair, e.g., the slitter unit entrance nip rolls. The air cylinder applies a biasing force on the dancer roll to maintain contact between the dancer roll and the web. A control device is coupled between the dancer roll and the next nip roll pair. The control device monitors the position of the dancer roll and increases or decreases the speed of the next nip roll pair based on the direction and magnitude of the dancer roll movement. In this manner, the tension in the web is kept substantially constant between the chill exit nip rolls and the next nip roll pair.

Post chill dancer roll

An offset lithographic printing process comprising printing at a relative humidity of 75-90% utilizing a water-based, single fluid, fountain solution free, printing ink containing (a) a macromolecular binder composed of binders soluble in water regardless of the pH of the water; resin rosin salt binders soluble in water at a pH from 7.5 to 10; and aqueous emulsion binders; (b) pigment and; (c) a re-wetting agent.

Offset lithographic printing process with a water based ink

A printing unit for a web fed rotary printing press for printing newspapers is provided in which the central impression cylinder (2) is commonly rotatably mounted in the two side walls (14a, 14b) of the housing (14) of the printing press and the blanket cylinder (4) and/or print cylinder (6) are rotatably cantilevered on one end in the first side wall (14a) during the make ready operation of the printing press, allowing a quick and easy changing of the cylinders (4, 6) via an opening (30) formed in the second side wall (14b). When the printing press is in operation the blanket and print cylinders (4, 6) may be additionally rotatably supported in a side plate (32) fitted to the opening (30), or may remain unsupported on their other ends.

Printing unit and register mechanism for mounting a printing sleeve

A printing unit (1) of a rotary printing press for using various ink types is provided. The printing unit includes an inking mechanism (45), a print cylinder (3), and a blanket cylinder (2). The inking mechanism (45) and the cylinders (2, 3) are mounted in side walls of the printing unit (1). A housing (14) at least partially surrounds the inking mechanism (45) and the cylinders (2, 3) to maintain a surrounding atmosphere within an at least semi-enclosed area (100) of the printing unit (1). A chemical agent is selectively added to the atmosphere in the semi-enclosed area (100) to reduce the rate of evaporation of a substance in the ink.

Printing unit using various ink types

A method of removing heat from a moving web includes providing a quantity of a liquid which has a temperature of vaporization below the surface temperature of the web; heating the liquid to a temperature slightly below the temperature of vaporization of the liquid; spraying the heated liquid onto the surface of the web; and vaporizing liquid from the surface of the web to cool the web. In a preferred embodiment, an electrically charged screen is disposed intermediate the sprayer and the web. The liquid passes through openings in the screen to form electrically charged droplets of liquid which move onto the surface of the web. An apparatus for removing heat from a moving web includes liquid supply means for providing a liquid having a temperature of vaporization below the surface temperature of the web; heater means for heating the liquid to a temperature slightly below its temperature of vaporization; and sprayer means for spraying the heated liquid onto the surface of the web.

Method for cooling a web

Web cooling device where liquid is applied to both sides of a hot web to enhance cooling via evaporation of the liquid from the web.

Growing community of inventors

Madbury, NH, United States of America

Robert Richard Murray