A slot machine having multiple spinning reels coaxially mounted in a frame for relative rotation. All machine movements are electrically activated by pulling a starting handle. The handle operates an electric switch which, in turn, initiates sequencing of the machine by a processor.
The reel and sprocket are mounted so that relative rotational movements between them in a first rotational direction are prevented when the two are in a predetermined angular orientation. However, relative rotational movement between the reel and sprocket is permitted over a limited arc in the opposite rotational direction. A spring interposed between them permits a slight overtravel of the reel beyond the arrest position of the sprocket, and thereafter returns it to its normal position relative to the sprocket. To prevent undesirable oscillations, a friction clutch is interposed between the reel and the sprocket.
The friction clutch is also designed to isolate the reel from abrasive contact with the sprocket, and to permit expulsion of abrasive contaminants between them. The clutch is of larger diameter than the hub faces of the reel and sprocket and is interposed therebetween, and has a plurality of slots extending radially from an inner portion between the hub faces and an outer area beyond the hub faces. Specially constructed wheel bearings also minimize accumulation of contaminants. Pivoting and nonpivoting solenoids are constructed so that contaminants settling therein do not impair their response time.