US Patent 8695978 Shuffling machine

A shuffling device of a shuffling machine, the device comprising a base comprising a first and a second side walls, a wheel rotatably mounted between the first and second side walls of the base, the wheel comprising a first portion and a second portion each of which comprising a plurality of teeth formed on the inner rim a plurality pairs of retainers mounted to the first and second portions of the wheel, and an optical coder detachably mounted to the wheel, a motor detachably mounted on one of the first and second side walls of the base, and a gear coupled to and driven by the motor, wherein the gear is engaged with the teeth of one of the first and second portions of the wheel.