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Belt pantograph 1




Green and blue pulleys have same diameter.

COD: straight line

AC and BD are parallel.

Triangles OAC and OBD are similar.

O: immobile

OC/OD = OA/OB = AC/BD = k = constant

Figures traced by pen D and pen C are similar but upside down each other. Scale factor is k.

Adjust OA and AC to get various values of k.

Bar linkage in a conventional pantograph is replaced by belt drive.



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