Heidelberger Druckmaschinen Ag

Karl-Hermann Miltner

Peter T Blaser

Anton Rodi

Dieter Hauck

Nikolaus Spiegel

Gregor Flade

A method and a device are disclosed for determining a degree of fouling of a printing unit of a printing machine. The method comprises washing a printing unit with a washing medium. A degree of fouling of the washing medium is measured, and a degree of fouling of the printing unit is determined from the degree of fouling of the washing medium. The device for performing the method comprises a translucent conduit, such as a transparent pipe, through which the washing medium in the form of a washing solution is conducted. A light source is disposed on one side of the conduit for shining light through the conduit. An optical sensor is disposed on the other side of the conduit opposite from the light source. The sensor receives the light which permeates the conduit. The degree of absorption of the light in the washing medium is proportional to its degree of soiling.

Method and device for determining the degree of soiling of a printing

A sheet feeder for a sheet-fed printing machine having a cylinder with a gripper system, movable suction conveyors for separating individual sheets from a sheet pile, the suction conveyors being disposed adjacent one another in a sheet-conveying direction, and groups of revolving adjustable conveying elements for aligning the sheets on a drive side and on an operating side of the printing machine in association with the suction conveyors and cooperating therewith for feeding the sheets to the gripper system of the cylinder of the printing machine, includes a drive system for driving the groups of conveying elements independently of one another and with varied speed so as to align the sheets on both of the sides of the printing machine, and a device disposed at locations of the revolving conveying elements for querying the sheet edges and for generating, in accordance with a response to a respective query, an electric pulse for controlling the drive system; and a method of separating and aligning the sheets in the sheet feeder.

Device and method for separating and aligning sheets in a sheet feeder

Device for depositing printed sheets on a sheet pile, including at least one pair of mechanical grippers for seizing the printed sheets at a respective leading edge thereof, the gripper pair being movable over the sheet pile and being controllable for releasing the printed sheets at a given instant of time, a pneumatic device for applying varying pressure to defined regions over a depositing surface of the respective printed sheets for decelerating and transporting the sheets against a mechanical stop, and adjusting elements for the grippers and the pneumatic device, also includes a control device including a computer and having an input and an output, the control device being connected via the output thereof to the adjusting elements, an input device for receiving sheet-specific and process-specific data being connected to the control device via the input thereof, the sheet-specific and process-specific data including data regarding two-dimensional mass distribution of the respective printed sheet, the adjusting elements of the pneumatic device being controllable by the control device so as to produce a pressure distribution on the depositing surface of the respective printed sheet which is correlated with the mass distribution of the respective printed sheet.

Device for depositing printed sheets on a sheet pile

Clamping and tensioning device for an inwardly bent trailing edge of a flexible printing plate disposed in an axial gap at the circumference of a plate cylinder adjustable in axial spacing and cooperating with a blanket cylinder, the printing plate being fixable at a leading edge thereof on the plate cylinder and being tensionable in circumferential direction on the plate cylinder, includes two clamping bars displaceably supported in the axial gap and forming therebetween a clamping slot for receiving therein an inwardly bent trailing edge of the printing plate, the two clamping bars extending axially in the gap within the cross-sectional contour of the plate cylinder and being loadable by reversible opposing clamping forces as well as by reversible tensioning forces in common in tensioning direction of the printing plate, and being respectively braced against the plate cylinder, the two clamping bars being formed with radially outer edges, the clamping and tensioning device being radially displaceably disposed in the axial gap of the plate cylinder, and a device for applying drive forces to the clamping and tensioning device for displacing the clamping and tensioning device with the radially outer edges of the two clamping bars radially outwardly at least to the cross-sectional circumferential contour of the plate cylinder, with the clamped bend of the trailing edge of the printing plate being displaceable back within the contour of the plate cylinder.

Clamping and tensioning device for a printing plate in a printing machine

Sheet-fed offset printing machine for automated changing of a printing plate having a plate cylinder for carrying a printing plate, the plate cylinder being formed with a gap extending in axial direction thereof, a blanket cylinder formed with a gap extending in axial direction thereof disposed in cooperative engagement with the plate cylinder, and a clamping device disposed in the plate-cylinder gap and including a pair of movably disposed clamping rails defining therebetween a clamping slot located within the cross-sectional contour of the blanket cylinder, includes an insertion device for inserting, into the clamping slot defined by the clamping rails, a bent edge of a printing plate disposed on the plate cylinder, the bent edge being located at a trailing end of the printing plate, the insertion device being disposed in the gap formed in the blanket cylinder and having a thrust body formed with a thrust surface movable radially out of the cross-sectional contour of the blanket cylinder against the trailing end of the printing plate on the plate cylinder.

Sheet-fed offset printing machine equipped for automated changing of

An assembly for controlling individual positioning elements in a delivery region of a sheet-fed printing machine, including at least one computer, at least one input device connected to the computer for inputting therein characteristic data specific to a sheet and/or to the printing machine, the computer having devices for further processing the characteristic data, and a control device operatively connected to the computer and having individual positioning elements for causing a format-dependent adjustment in accordance with the inputted characteristic data, the computer having devices for calculating, from the characteristic data, energy of the sheet oncoming to the delivery region and, in accordance with the calculated energy value, also for calculating an actuating value for at least one individual positioning element in the delivery region so that energy withdrawal by the individual positioning element is substantially equal to the energy of the oncoming sheet in the delivery region, the control device having devices for actuating the individual positioning element in accordance with the calculated value; and method of operation.

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Dossenheim, Germany

Karl-Hermann Miltner