Cam 1 rotates about fixed axis A and has two profiled grooves, a and b. Follower 4 turns about fixed axis C and carries roller 8 which rolls and slides along groove a. Follower 4 has two slotted arms with slots d and c. Slot c slides along pin e of pawl 3 which slides in guide D of follower 2. Follower 2 turns about fixed axis B and carries roller 7 which rolls and slides along groove b. Latch 5 slides in fixed guides E and carries pin f which slides in slot d. Drum 6 rotates about axis B. When cam 1 rotates continuously, drum 6 is rotated intermittently by tooth k of pawl 3 when it enters a tooth space m of drum 6. At the same time, latch 5 is retracted from a tooth space m.
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