Crank 1 and wheel 2 rotate about crossed perpendicular fixed axes A and B. Wheel 2 has helical teeth a. When crank 1 rotates continuously, it engages teeth a and rotates wheel 2 intermittently with long dwells. To each revolution of crank 1, wheel 2 turns through an angle equal to ϕ=2π/z₂, where z₂ is the number of teeth of wheel 2.
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