Abstract: A rotation ring barker comprises a stator and a rotor which has an opening for lengthwise feeding of a log and which is associated with a number of working tools, each of which is actuated by a spring mechanism normally striving to maintain the tool yieldingly urged against a log passing through the rotor for removing the bark from the log. If necessary, the individual tools are jointly movable in a direction outwardly from the log against the action of said spring mechanism. Positioned between the rotor and stator is a ring element which is rotatably mounted on said rotor and, during normal operation, follows the rotor. The ring element is connected, via a transmission, with the drive shaft of a pump mounted on and constantly following the rotor.