METHOD OF ADJUSTING A ROLLER IN A ROTARY PRINTING PRESS

• US 20160318297A1
• Filed: 07/11/2016
• Published: 11/03/2016
• Est. Priority Date: 10/23/2006
• Status: Abandoned Application

• Current Assignee: Bobst Bielefeld GmbH (JBF Finance SA)
• Original Assignee: Bobst Bielefeld GmbH (JBF Finance SA)
• Inventors: Kckelmann, Andreas, Whitelaw, Gordon, Grautoff, Georg
• Application Number:
  US15/206,835
• Publication Number:
  US 20160318297A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B41F 13/14 with means for displacing the cylinders
• CPC Class Codes: B41F 13/30 Bearings mounted on sliding supports
• CPC Class Codes: B41F 3/56 Devices for adjusting cylinders relative to type-beds and setting in adjusted position
• CPC Class Codes: B41F 9/02 for multicolour printing
• CPC Class Codes: B41P 2200/12 Flexographic printing
• CPC Class Codes: B41P 2227/30 Detecting the correct position of printing plates on the cylinder

Abstract

A method of adjusting a roller (18) in a rotary printing press (10), comprising by the steps of:

• a) mounting the roller (18) in a preparation rack (24) 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 (10), and
• e) adjusting the roller in accordance with the set data.

Claims

1. A method of adjusting a printing cylinder in a rotary printing press, comprising the steps of:

applying a printing pattern and a reference mark with a fixed spatial relationship relative to one another on the printing cylinder,

deriving set data for the adjustment of the printing cylinder from said fixed spatial relationship, and storing the set data,

mounting the printing cylinder in the printing press,

detecting the position of the reference mark on the printing cylinder in the printing press, and

adjusting the printing cylinder in accordance with the set data and the detected position.

2. The method according to claim 1, wherein the printing cylinder is a cylinder of an offset printing press.

3. A method of preparing and adjusting a roller in a rotary printing press, comprising the steps of:

providing topography data that define a surface topography of the roller,

mounting the roller in a preparation rack so as to be rotatably supported therein,

machining a peripheral surface of the roller on the basis of the topography data, thereby to obtain a specific topography of the roller surface, exactly in accordance with the topography data,

mounting the roller in the printing press,

deriving set data for adjustment of the roller from the topography data, and

adjusting the roller in accordance with the set data.

4. The method according to claim 3, comprising the further steps of:

starting a print run and monitoring results of the print process,

fine-adjusting the roller on the basis of the monitored results, and

storing information on the fine-adjustment on a storage medium that is assigned to the roller for future uses of that roller on the same printing press.

5. The method according to claim 3, comprising the further step of detecting at least two points on the peripheral surface of the roller, when the roller is mounted in the printing press, thereby to detect a position of an axis of rotation of the roller.

6. A rotary printing press comprising a number of colour decks, each of which includes at least one roller and an adjusting system for adjusting the position of the roller relative to at least one other component part of the printing press, wherein at least one colour deck comprises a control unit adapted to receive and process set data for the roller, the set data describing at least one of a topography of the surface of that specific roller and a spatial relationship between a printing pattern and a reference mark formed on the roller, and the control unit is further adapted to control the adjusting system in accordance with these set data, thereby to adjust the roller to an optimal printing position for printing with at least reduced production of waste.

7. The printing press according to claim 6, wherein the roller includes a reference mark, and the colour deck includes a detector for detecting the reference mark.

8. The printing press according to claim 7, wherein the roller includes a reference mark in the form of a magnet, and the colour deck includes a hall detector having at least two detection axes for detecting the reference mark.

9. The printing press according to claim 7, wherein the roller includes a reference mark which is one of a metal block and a recess in a metal body, and the colour deck includes an inductive position detector having at least two detection axes for detecting the reference mark.

10. The printing press according to claim 6, wherein the roller includes an RFID chip that stores the set data, and said at least one colour deck comprises a detector adapted to read the RFID chip.

11. The printing press according to claim 10, wherein the detector is adapted to write onto the RFID chip.

12. The printing press according to claim 6, comprising a laser detection system for detecting at least two points on a peripheral surface of the roller, when the roller is mounted in the printing press, thereby to detect a position of an axis of rotation of the roller.