Driving pin wheel 1 carries pins a and rotates about fixed axis A. When wheel 1 rotates continuously, driven sprocket 2 rotates intermittently with dwells about fixed axis B. The average transmission ratio from wheel 1 to sprocket 2 is i₁₂=z₂/z₁ where z₁ is the number of pins on wheel 1 and z₂ is the number of teeth of sprocket 2. Spring-loaded pawl 3 with roller b prevents unintentional rotation of sprocket 2 during the dwells.
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