Segment gear 1 and gear 2 rotate about fixed axes A and B. When driving segment gear 1 rotates continuously clockwise, driven gear 2 rotates together with disk d, rigidly attached to gear 2, until the teeth of segment gear 1 run out of engagement with those of gear 2. Then concentric projection a engages a concave surface b of disk d, locking gear 2 in its dwell position. To each revolution of segment gear 1, gear 2 turns through an angle equal to ϕ₂=2.2π. Therefore, following each revolution of segment gear 1, gear 2 has a dwell in a position differing from its preceding position by the angle ϕ=0.2π. The transmission ratio of the mechanism is i₁₂=z₂/z₁=(R₂/R₁)(2.2π/ϕ₁) where z₁, z₂, R₁ and R₂ are the numbers of teeth and pitch radii of segment gear 1 and gear 2, and ϕ₁ is the central angle of segment gear 1.
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