Abstract

Printing cylinder arrangement for a rotary printing machine, comprising a mandrel (12) that is rotatably supported in a machine frame (14) and a sleeve (16) that surrounds the mandrel with a spacing and has both its ends rigidly supported on the mandrel via disks (18), characterised in that a vibration dampening device (36A) for dampening bending oscillations of the mandrel (12) is arranged inside the sleeve (16).

IPC Classes  ?

• B41F 13/08 - Cylinders
• B41F 13/10 - Forme cylinders
• B41F 27/10 - Devices for attaching printing elements or formes to supports for attaching non-deformable curved printing formes to forme cylinders

Abstract

A method of colour setting in a rotary printing press, wherein a composition of an ink is adjusted until colour specifications of a printed product, that is formed by a substrate with said ink printed thereon, match given target colour specifications, characterised by the steps of measuring (S1) a volume carrying capacity of an inking roller that will be used in the printing press for printing with said ink, measuring (S2) a spectral opacity of the substrate, - measuring (S3) a spectral absorptivity of the ink when it is in a liquid state in the printing press; and; entering the measured volume carrying capacity, spectral opacity and spectral absorptivity into a mathematical model (S4) for predicting the colour specifications of the printed product.

IPC Classes  ?

• B41F 31/02 - Ducts, containers, supply or metering devices
• B41F 33/00 - Indicating, counting, warning, control or safety devices

Abstract

A method for calibrating a rotary printing press, wherein a bearing structure for a printing cylinder is adjusted relative to another component (12; 16) of the printing press, and positions of the bearing structure are measured, comprising by the steps of - mounting a calibration tool (90) on a mandrel (88) that is supported in the bearing structure, said calibration tool having at least one contact sensitive switch (92), - moving the bearing structure until the switch (92) contacts said other component (12; 16), and - upon detection of a signal from the switch (92), storing the measured position of the bearing structure as a reference position.

IPC Classes  ?

• B41F 13/14 - Registering devices with means for displacing the cylinders
• B41F 13/30 - Bearings mounted on sliding supports

Abstract

A printing press comprising at least one exchangeable cylinder (10, 12) that is rotatably supported in a machine frame, a movable bearing member (18) froming part of a bearing (44) for the exchangeable cylinder (12), and a sensor head (26, 28, 30) that is capable of receiving signals from a signalling device (22, 24, 32) that is mounted on one of the cylinders (10, 12) of the printing press, characterised in that the sensor head (26, 28, 30) is mounted on the movable bearing member (18) and is arranged to receive the signals from a signalling device (22, 24, 32) at least when the bearing member (18) is in a predetermined position.

IPC Classes  ?

• B41F 13/14 - Registering devices with means for displacing the cylinders
• B41F 13/32 - Bearings mounted on swinging supports
• B41F 33/02 - Arrangements of indicating devices, e.g. counters

Abstract

The invention relates to a rotary printing press comprising a number of colour decks (A-J), at least one of which comprises a cylinder (16, 18), and an adjusting system for adjusting the position of the cylinder (16, 18) in relation to at least one other component (12) of said printing press. Said rotary printing press is characterised in that the at least one colour deck (F) comprises a control unit (50) that is configured to capture and process data relating to the cylinder, said data describing the topography of the surface of said specific cylinder and/or a spatial relationship between a printing pattern and a reference mark (36) embodied on the cylinder. The control unit (50) is configured such that the adjusting system can be controlled according to said adjusting data in order to optimally adjust the position of the cylinder for printing, producing little or no waste at all.

IPC Classes  ?

• B41F 5/18 - Rotary letterpress machines for printing on webs for multicolour printing using one impression cylinder co-operating with several forme cylinders
• B41F 5/24 - Rotary letterpress machines for flexographic printing
• B41F 13/14 - Registering devices with means for displacing the cylinders
• B41F 33/00 - Indicating, counting, warning, control or safety devices
• G01B 11/24 - Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
• B41F 5/20 - Rotary letterpress machines specially adapted for proof printing
• B41F 7/18 - Rotary lithographic machines specially adapted for proof printing
• B41F 9/04 - Rotary intaglio printing presses specially adapted for proof printing
• B41F 13/02 - Conveying or guiding webs through presses or machines
• B41F 13/12 - Registering devices
• B41F 13/34 - Cylinder-lifting or -adjusting devices
• B41F 13/38 - Cylinder-lifting or -adjusting devices electrically or magnetically operated
• B41F 31/30 - Arrangements for tripping, lifting, adjusting, or removing inking rollersSupports, bearings, or forks therefor
• B41C 1/10 - Forme preparation for lithographic printingMaster sheets for transferring a lithographic image to the forme

Abstract

The invention relates to a printing press comprising a cylinder (12, 16, 18). Said printing press is characterised by scanning equipment (116, 118, 120, 122: 136, 138) configured to scan the peripheral surface of the cylinder whilst said cylinder rotates in the printing machine.

IPC Classes  ?

• B41F 5/18 - Rotary letterpress machines for printing on webs for multicolour printing using one impression cylinder co-operating with several forme cylinders
• B41F 5/24 - Rotary letterpress machines for flexographic printing
• B41F 13/14 - Registering devices with means for displacing the cylinders
• B41F 33/00 - Indicating, counting, warning, control or safety devices
• G01B 11/24 - Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
• B41F 13/24 - Cylinder-tripping devicesCylinder-impression adjustments