Pin wheel 1 with pins b rotates about fixed axis A and periodically meshes with teeth d of sprocket 2 which rotates about fixed axis B. Pin wheel 1 has concentric locking surface a-a and sprocket 2 has two symmetrically located concave surfaces e. When driving pin wheel 1 rotates continuously, driven sprocket 2 rotates intermittently with dwells. During the dwells, locking surface a-a engages one of concave surfaces e to prevent unintentional rotation of sprocket 2.The period of rotation T_r of sprocket 2 is equal to the dwell period T_d. The working time factor of the mechanism equals k=(T_r)/(T_d)=1. To each revolution of wheel 1, sprocket 2 turns through the angle ϕ₂=π. The profiles of teeth d of sprocket 2 are along curves which are equidistant to an epicycloid of a circle. The transmission ratio from wheel 1 to sprocket 2 during the rotation period T_r is i₁₂=r₂/r₁ where r₁ and r₂ are the pitch radii of wheel 1 and sprocket 2.
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