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When driving pin wheel 1, carrying two pins, 4 and 5, turns through angle ψ about fixed axis K, intermediate sprocket 2 and pin wheel 3, constantly engaged to sprocket 2, turn about fixed axes F and H through an angle of two teeth. Thus pin wheel 3, carrying 20 pins, turns through one tenth of a revolution. Alternate teeth of sprocket 2 have a shorter face width. During each idle period of pin wheel 3, two full width teeth of sprocket 2 engage the outer circumference of driving pin wheel 1, thereby preventing unitentional rotation of pin wheel 3.

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Documents: Gear mechanisms  [Streambook]
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