Patent ID: 7520963

Claim:
An apparatus for axially oscillating a roll of a paper machine, comprising: a cradle mounted for linear motion and having a structure for attachment to the roll; a first pair of eccentric masses rotatably mounted on the cradle, the first pair of eccentric masses being mutually synchronized and arranged to be driven in rotation by a first drive shaft; a second pair of eccentric masses rotatably mounted on the cradle, the second pair of eccentric masses being mutually synchronized and arranged to be driven in rotation by a second drive shaft; and a drive train, wherein the drive train comprises a motor; a first gear arranged to be driven by the motor, the first gear connected to the first drive shaft; a second gear mounted about the second drive shaft, the second gear directly intermeshed with the first gear; and an adjustment element, arranged between the second gear and the second drive shaft, and operable to rotate the second drive shaft relative to the first drive shaft in order to change their mutual position and thus to create and adjust a phase difference between the first drive shaft and the second drive shaft.