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The grey disk with an Archimedean rib is fixed.

The green disk with the same rib receives motion from a pink eccentric shaft. Due to a Oldham mechanism with the orange disk the orientation of the green disk does not change during motion.

Suction place is at disk periphery and discharge one is at center of the fixed disk. For more see:

The eccentricity of the pink shaft e = (p - 2a)/2

p: pitch of Archimedean spiral

a: thickness of the Archimedean rib

Instead of Archimedean spiral, other spirals can be used, for example, involute one.

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