Segment gear 1 turns about fixed axis A and meshes with gear rack 2 which slides in fixed guides b-b. Pawl 3 turns freely about axis B which belongs to rack 2. When segment gear 1 is turned counterclockwise, pawl 3 enters a hole a in strip 4 and, bearing against lug d of the rack, advances strip 4 to the right. When gear 1 is turned clockwise, pawl 3 slides along the strip.
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