Lever 1 oscillates about fixed axis A and carries pawl 2 which engages the teeth of ratchet wheel 3. Wheel 3 is keyed to shaft 7 and rotates it intermittently counterclockwise about axis A. Pawl 4, also pivoted on lever 1, engages the teeth of ratchet wheel 5 which is confined between leather friction disks 6 that can be adjusted to obtain the required pressure. Shield, or mask, a, carried on ratchet wheel 5, prevents pawl 2 from engaging wheel 3 so that shaft 7 has a dwell until pawl 4 turns wheel 5 with shield a so that it no longer interferes with the action of pawl 2.
$2741$RG,D$