Patent ID: 8656807

Claim:
A tuned damper for an input shaft on a rotary encoder, the damper comprising: a mounting plate coupled to the input shaft of the encoder; a mass plate coupled to the mounting plate; a plurality of mounting flanges formed on the mass plate; a mounting aperture formed in each mounting flange; a plurality of fastening elements coupling the mass plate to the mounting plate; first and second resilient elements on either side of each mounting flange, the first and second resilient elements comprising resilient donuts having a central aperture; the second resilient element positioned between the mounting flange and the mounting plate and separating the mounting flange from direct contact with the mounting plate; whereby the fastening elements pass through the central apertures in the first and second resilient elements and through the mounting aperture formed in the mounting flanges; whereby the diameter of the fastening elements is smaller than the diameter of the mounting apertures in the mounting flanges and the inner diameter of the central apertures in the first and second resilient elements so that the body of the fastening elements does not touch the body of either the first or second resilient elements or the mounting flange and the mass plate does not directly contact the mounting plate to isolate the mass plate from the mounting plate, and whereby the mass plate dampens torsional vibration which may exist in the input shaft of the encoder.