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Two-axis motion mechanism

Image Number 4 for United States Patent #5243873.

A two-axis motion mechanism with reduced backlash includes two-axis motion that is transferred between a moveable member and a first and second shaft positioned orthogonal to each other through three principle bearings. The first and second shaft are fixedly positioned so as to constrain motion except about a first and second axis therethrough, respectively. The second axis is substantially orthogonal to the first axis intersecting at the center of the mechanism. An outer ring, having the moveable member connected thereto and an inside ring nested therein lies in a plane transverse to the second shaft. Pins connect the outer ring with the inside ring. A case member is positioned about the outer ring with the first shaft mounted thereto. First duplex bearings couple the inside ring to a rod extending across the inside ring and connected to the second shaft at the center of the mechanism. The first duplex bearings allow rotation of the inside ring and the first axis. Second duplex bearings couple the inside ring to the pins to allow rotation between the inside ring and the outer ring. Third duplex bearings engage the case member and hold the outer ring allowing rotation of the outer ring and the moveable member extending therefrom about the second axis.

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