Convertible moisture/ink system in printing or duplicating machines

In a printing machine, a moisture feeding system for distributing moisture to a form roller in a rolling contact with a master cylinder, comprising:

• a moisture fountain having a fountain roller rotatable in the fountain;
• a pickup roller in rolling contact and driving connection with the fountain roller;
• a transfer roller in rolling contact between the pickup roller and said form roller;
• first drive means located at one axial end of the fountain and pickup rollers for conjointly driving the fountain and pickup rollers;
• second drive means located at an axial end opposite said one end for selectively driving the transfer roller;
• engaging means at one axial end of said transfer roller for operative driving connection with either said first and second drive means;
• and
• means mounting the transfer roller so as to be invertible end-to-end for switching the operative driving connection of the transfer roller between said first and second drive means.