The worm wheel rotates about fixed axis B-B and is made up of three sections, 1, 2 and 3. Section 1 is keyed to shaft 7 and has two concentric slots a, one on each side. Sections 2 and 3 rotate freely on shaft 7, but can be driven by stop bolts 4 and 5 whose heads enter slots a and concentric slots in sections 2 and 3, long enough to allow adjustment of stop bolts 4 and 5. In each of slots a, a stop (not shown) is fastened that engages stop bolt 4 or 5. A part of the teeth, on an arc long enough to make complete disengagement with the worm (not shown), is cut from sections 1, 2 and 3. Thus when the part where the teeth are cut away on one of the sections faces the driving worm, the section remains stationary until a stop or stop bolt of the adjacent section runs up against the bolt or stop of the stationary section, after which the stationary section begins to rotate. Thus, by making various settings of stop bolts 4 and 5, intermittent rotation in various combinations can be transmitted to crank 8, keyed to shaft 7; eccentric 6, integral with section 2; and crank 9, integral with section 3.
$2823$WG,ML$