Patent ID: 7561175

Claim:
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 coefficient α SP 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 K 0 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 α RS ; and preparing to perform a recording of the printing original by setting a corrected number K k of stepping motor cycles per revolution of the exposure drum in accordance with relationship K k =c*K 0 and setting a correction factor c in dependence on different values of the first and second expansion coefficients responsible for temperature-dependent length expansions of the feed spindle and of the reference object.