Patent ID: 7251449

Claim:
A mechanism, comprising: a member including a first axis and a surface non-concentric with said first axis; a first gear rotatably mounted on said member at a second axis different from said first axis; a device coupled to either of said member or said first gear to rotate said member about said first axis when said first gear rotates about said second axis; a second gear; and a third gear, wherein movement of said member moves said first gear from engagement with said second gear and into engagement with said third gear, wherein said second gear is operatively connected to a drive roller through an odd number of gears and said third gear is operatively connected to said drive roller through an even number of gears such that rotation of said second gear in a first direction rotates said drive roller in said first direction, and wherein rotation of said third gear in a second, opposite direction rotates said drive roller in said first direction.