You need to speak to your Rov. Different machines have different issues and he will be able to instruct you on how to go about using it on Shabbos. Some have digital readings some dont etc.
See this link for some of the issues by different machines : http://www.zomet.org.il/eng/
Rav Moshe Feinstein Zt’l forbids sending clothes to be dry cleaned even if one needs the clothes for the Moed. He believes that this is an activity of Maaseh Uman that is forbidden on Chol Hamoed even Letzorech.