Bobst Bielefeld Gmbh

Fischer & Krecke Gmbh & Co. Kg

Fischer & Krecke Gmbh & Co.

Fischer & Krecke

Gordon Whitelaw

Wolfgang Brusdeilins

Andreas Kückelmann

Bodo Steinmeier

Frank Rudolph

Thomas Haecker

Georg Grautoff

Ron Shemesh

Wolfgang Brusdeinlins

Georg Grauthoff

A color proofing apparatus, including an engraved roller () having a pattern of ink accommodating cavities on its peripheral surface, a back pressure cylinder () forming a nip with the engraved roller (), a conveyor () adapted to feed a sheet () of a print substrate through the nip in synchronism with the movements of the peripheral surfaces of the engraved roller () and the back pressure cylinder (), and an optical sensor () disposed at the conveyor () for measuring a color value of the sheet () that has passed through the nip.

Colour proofing apparatus and method

A method of adjusting a roller () in a rotary printing press (), includes the steps of a) mounting the roller () in a preparation rack () so as to be rotatably supported therein, b) scanning the peripheral surface of the roller, thereby to detect a topography of the roller surface, c) deriving set data for the adjustment of the roller from the topography, and storing the set data, d) mounting the roller in the printing press (), and e) adjusting the roller in accordance with the set data.

Rotary printing press and method for adjusting a cylinder thereof

A printing press includes at least one exchangeable cylinder () that is rotatably supported in a machine frame, a movable bearing member () forming part of a bearing () for the exchangeable cylinder (), and a sensor head () that is capable of receiving signals from a signalling device () that is mounted on one of the cylinders () of the printing press, and the sensor head () is mounted on the movable bearing member () and is arranged to receive the signals from a signalling device () at least when the bearing member () is in a predetermined position.

Printing press with cylinder sensor

A method for calibrating a rotary printing press, in which a bearing structure for a printing cylinder is adjusted relative to another component of the printing press, and positions of the bearing structure are measured, including the steps of mounting a calibration tool on a mandrel that is supported in the bearing structure, the calibration tool having at least one contact sensitive switch, moving the bearing structure until the at least one switch contacts the other component, and upon detection of a signal from the at least one switch, storing a measured position of the bearing structure as a reference position.

Method and calibration tool for calibrating a rotary printing press

A method of exchanging printing units at a running rotary printing press, wherein a first printing unit is withdrawn from the printing medium, and a second printing unit for printing the same image with the same register is set against the printing medium, includes the steps of applying to the printing cylinder of the second printing unit, prior to start of the printing operation, a register printing block elevated relative to the regular printing block; prior to changeover of the printing units, setting the second printing unit against the printing medium such that register marks print with the register printing block without an image printing with the regular printing block; detecting register marks and adjusting the second printing unit register by reference to the detected register mark; and with the register adjusted, exchanging the printing units by withdrawing the first printing unit and setting the second printing unit.

Method of exchanging a printing unit at a running rotary printing press

A method for knocking-off a web () round on a turret winder () by a knocking-off device () includes a pressure roller (), in which the knocking-off device () and a coil () of the winder () are, through an abrupt relative movement, brought into a position in which the pressure roller () engages the periphery of the coil () and the abrupt movement is a pivotal movement (B) of the coil () about a pivotal axis that extends in parallel with the axes of rotation thereof.

Method for knocking off a web wound on a turret winder

A method for flexographic multi-color printing, wherein a print medium web is passed continuously through a flexographic printing press having at least two ink units, each ink unit including a printing cylinder, an anilox roller and an ink sup-ply system adapted to supply liquid ink of a specific color to the anilox roller, wherein the inks supplied in the different ink units differ in both, color and mass density, the method including the steps of mounting, in at least one of the ink units, an anilox roller having a larger diameter than the anilox roller of another one of the at least two ink units, and during printing, supplying the ink with the largest mass density to the anilox roller having the larger diameter.

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Gordon Whitelaw