Method and device for compensating for a temperature-dependent length change of the feed spindle of a printing plate exposer

A method for adapting a number of stepping motor cycles K per revolution of an exposure drum to a temperature-dependent length change of a feed spindle having a first expansion coefficientαSP in an exposer for recording printing originals, which comprises the steps of:

• moving an object carrier axially along the exposure drum in a feed direction on the feed spindle using a stepping motor;
• performing a basic setting by setting a first number Ko of stepping motor cycles per revolution of the exposure drum;
• providing a reference distance substantially parallel to the feed direction using a reference object having a second expansion coefficient of αRS;
• and
• preparing to perform a recording of the printing original by setting a corrected number Kk of stepping motor cycles per revolution of the exposure drum in accordance with relationship Kk=c*Ko and setting a correction factor c in dependence on different temperature-dependent length expansions of the feed spindle and of the reference object.