Segment gears 1 and 2 rotate about fixed axes A and B. When gear 1 rotates continuously counterclockwise, gear 2 rotates intermittently with dwells. Concentric locking surfaces a engage concave surfaces b to avoid unintentional rotation of gear 2 during its dwell periods. Impacts are reduced at the instants when the teeth of gears 1 and 2 come into engagement by freely mounted spider 3 which has as many arms d as there are locking arcs b. Spider 3 is connected to gear 2 by spring 4. Clockwise rotation of spider 3 with respect to gear 2 is restricted by pin c. Just before the teeth of gears 1 and 2 come into engagement, one of the pins e of gear 1 engages the corresponding arm of spider 3, turning the spider clockwise and imparting a certain initial velocity to gear 2. This reduces the impact that may occur when the teeth of gears 1 and 2 begin to mesh.
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