The lengths of the links comply with the conditions: the angle of inclination of slot b to guides p-p equals α=arccos((r₁-r₂)/A͞B) where r₁ and r₂ are the radii of pulleys 1 and 2. Pulley 1 rotates about fixed axis A and, through flexible link 3, rotates pulley 2 about fixed axis B. Pin a of flexible link 3 slides along slot b of slider 4 which moves in fixed guides p-p. When pulley 1 rotates about axis A, slider 4 reciprocates in guides p-p. When pin a travels along straight portion df of its path, slider 4 has a dwell in its right-hand extreme position.
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