Intermittent gear 1 and gear 3 are keyed to the driving shaft (not shown) and mesh with gears 2 and 4. Gear 2 is keyed to driven shaft 8, rotating about fixed axis A, and gear 4 is free to turn on this shaft, being mounted between friction washers 5 and 6 which, in turn, are between gear 2 and disk 8. The pressure of washers 5 and 6 against gear 4 can be varied by adjusting locnuts 9, thereby changing the tension of spring 7. Friction washers 5 and 6 tend to transmit rotation to the driven shaft. During the dwell period, gear 2 is stationary and gear 4 slips with respect to shaft 8. At the end of the dwell period, when point b of surface a on gear 1 has passed point d of surface e on gear 2 (as shown), shaft 8 begins to rotate due to the action of gears 3 and 4 and the friction drive, before the teeth of gears 1 and 2 come in to contact. Thus rotation of shaft 8 is started smoothly, with no shock, after the dwell period.
$3446$CF,D$