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Keeping direction unchanged during motion 13

Orange plate performs planar motion without rotation.

Its upper surface is kept always horizontal thanks to 4 bevel gear drive of equal tooth numbers driven by a motor. Pink gear is fixed.

Sliding joints between green and yellow bars and between grey shafts allow radial displacements of the orange plate that are controlled by violet actuator.

4 bevel gear drive can be replaced by 4 screw gear drive in another embodiment of this mechanism.

This mechanism can be applied for manipulator of polar coordinate system.

Disadvantage: the actuator is not base-mounted.

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