| US 7,561,175 B2 | ||
| Method and device for compensating for a temperature-dependent length change of the feed spindle of a printing plate exposer | ||
| Jörg-Achim Fischer, Laboe (Germany); and Bernd Lassen, Mönkeberg (Germany) | ||
| Assigned to Heidelberger Druckmaschinen AG, Heidelberg (Germany) | ||
| Filed on Jul. 13, 2006, as Appl. No. 11/485,674. | ||
| Claims priority of application No. 10 2005 036 096 (DE), filed on Aug. 01, 2005. | ||
| Prior Publication US 2007/0024697 A1, Feb. 01, 2007 | ||
| Int. Cl. B41J 2/435 (2006.01); B41J 2/47 (2006.01); B41J 29/393 (2006.01) | ||
| U.S. Cl. 347—234 [347/19; 347/248] | 21 Claims |
| 1. 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 αSP 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 K0 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*K0 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.
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