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Method for aligning the block to the stop

A stopper and relative movement technology, applied in printing plates, printing, printing machines, etc., can solve problems affecting accuracy, detection device failure, etc.

Active Publication Date: 2008-08-13
HEIDELBERGER DRUCKMASCHINEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Contamination on the register blanking of the printing plate as well as on the register pins can adversely affect the accuracy or lead to a malfunction of the detection device

Method used

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  • Method for aligning the block to the stop
  • Method for aligning the block to the stop
  • Method for aligning the block to the stop

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0013] FIG. 1 shows register pins 1 , 2 which are arranged on a printing form cylinder along a line which is parallel to the axis of rotation of the printing form cylinder. The registration pin 1 has a circular cross section. The registration pin 2 has a rectangular cross-section and has an abutment surface 3 parallel to the axis of rotation of the printing plate cylinder. In preparation for a printing process, a printing forme 4 is fixed on the forme cylinder. The printing plate 4 is advanced in the direction 7 of the register pins 1 , 2 by friction rollers 5 , 6 . The printing plate 4 has a U-shaped cutout 9 and a rectangular cutout 10 on the front printing plate edge 8 . The cutouts 9 , 10 have a distance a like the register pins 1 , 2 . Friction rollers 5 , 6 rest against the surface of printing plate 4 and can be driven by motors 11 , 12 . The motors 11 , 12 are connected to a control device 13 .

[0014] 2 thermal sensors 14.1, 14.2, 15.1, 15.2 are respectively arra...

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PUM

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Abstract

The invention relates to a method for aligning a printing plate against a stop. It is the object of the invention to propose a method which allows improved reliability. The invention consists in: in a method (in which the printing plate (4) and the stop (2) are moved relative to each other; detecting the temperature change which occurs between the printing plate (4, 10, 11) and the stop (1, 2) Occurs on the temperature probes (14, 15) connected to the stops (1, 2) during contact; from the signals of the temperature probes (14, 15) derive some indications of the relative position of the printing plate (4) to the stops (1, 2). 2), a signal representing the thermal conductivity between the printing plate (4) and the stops (1, 2) is derived from the rate of change of the temperature detector signal, wherein, if the thermal conductivity is lower than a A predetermined threshold value is then output as a signal indicating that the printing plate ( 4 ) is incorrectly aligned on the stop ( 1 , 2 ).

Description

technical field [0001] The invention relates to a method for aligning a printing plate against a stop according to the preamble of claim 1 . Background technique [0002] DE 103 54 429 A1 discloses a device for detecting the position of a printing plate relative to a register pin, which comprises at least one sensor which is responsive to temperature changes. In one embodiment, calorimetric detectors are integrated on the registration pin. As soon as the printing plate rests on the register pins, heat exchange takes place between the printing plate and the detector. By evaluating the temperature change signal derived by the detector, a signal can be generated which indicates the abutment of the printing plate on the register pin. [0003] The accuracy when detecting the position of the printing plate on the register pins depends on the thermal resistance between the respective register pin and the printing plate. Contamination on the register blanking of the printing plat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41F27/00B41F33/04
CPCB41F27/005B41F33/14B41P2227/30Y10S101/36
Inventor G·施内尔
Owner HEIDELBERGER DRUCKMASCHINEN AG