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Straight line drawing mechanism 4b

Input: green crank.

Blue pulley is stationary. Four cranks are of the same length L.

Belt drive on green crank has transmission ratio of 2.

Belt drives on yellow and pink cranks have transmission ratio of 1.

End point of grey bar traces a straight line. It can reach a distance D = 4L from the blue pulley center.

The belt should be toothed. Using chain drive is possible.

By connection of modules of two cranks and a 1/1 belt drive the distance D can be increased to 6L, 8L, ...

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