Rotary cutting apparatus with vibration attenuation means

A rotary cutting apparatus, comprising:

• a frame;
• a first rotary device comprising a first shaft concentrically arranged about a first rotational axis and a first drum concentrically arranged on said first shaft, said first shaft being provided with a first pair of bearing housings arranged on either sides of said first drum;
• and
• a second rotary device comprising a second shaft concentrically arranged about a second rotational axis, and a second drum concentrically arranged on said shaft, said second shaft provided with a second pair of bearing housings arranged on either sides of said second drum;
• wherein said first and second rotary devices are arranged in said frame in such a way that said first and second axes are substantially horizontal and substantially in the same vertical plane,
• wherein said second shaft is connected to the frame via said second pair of bearing housings,
• wherein said first shaft is associated with said frame via said first pair of bearing housing said first pair of bearing housings are movable relative to said frame in a transverse direction to said first rotational axis by means of a force means,
• wherein means is provided for passive vibration attenuation of at least said first shaft, said means for passive vibration attenuation comprising a mass damper having a housing and a damping body movably arranged inside said housing,
• wherein said mass damper is associated with said first pair of bearing housings,
• wherein said housing has the shape of an elongated cylinder with circular cross-section, said housing provided with a rod or a tubing, said rod or tubing being concentrically arranged inside said housing by means of at least one bushing, and
• wherein a longitudinal axis of said elongated cylinder is arranged parallel to said first rotational axis.