Abstract: A device for inking a screen roller of a rotary printing machine, with an ink chamber, arranged along side of the screen roller, which has an opening pointing toward the screen roller and which is closed on the front side by side walls and which has at least one ink inlet as well as a chamber body with a circular interior. In order to allow the screen roller to be inked in a manner correct for printing using simple technical devices, the ink inlet into the inking chamber is to allow the creation of an ink roll moved by the screen roller during operation in a rotating fashion.