Driving gear 1 rotates about fixed axis A and meshes with both driven gears 2 and 3. Two identical gears 2 and 3 rotate about fixed axis B. Gear 2 is rigidly attached to (keyed on) shaft 5; gear 3 turns freely on this shaft. Gears 2 and 3 are connected together by springs 4. These springs shift gear 3 with respect to gear 2, thereby filling the tooth spaces of gear 1 and eliminating backlash in the gearing.
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