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Gear and linkage mechanism 8a

The green bar has unchanged direction during rotation.

The gears have the same tooth number and the same distance of their pins to their rotation axes.

Assembly requirement: there is mechanism position where pin axes and gear rotation axes are on a plane and both pins are in the middle (or outside) of the gear center distance.

If not the green bar has complicated motion as in:

Gear and linkage mechanism 8b

(c) All rights reserved.