Link 1 rotates about fixed axis A and has teeth b and c. Pin wheel 2 rotates about fixed axis B and has rollers (pins) 3 rotating about axes C of wheel 2. When link 1 rotates continuously, teeth b engage a roller 3 and turn wheel 2. After this, teeth c enter the space between two adjacent rollers 3 locking wheel 2 during its dwell period.
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