US Patent 7743942 Dispensing wheel alignment devices in vending machine

A vending machine has a dispensing wheel rotatably mounted on a head with an outer peripheral rim on the wheel having elements displaced angularly from one another in an endless row and radially relative to a central axis of the wheel so as to define a driven gear on the wheel and an alignment device permitting latching of the wheel at, and releasing it from, a desired orientation on the head in a dispensing cycle such that during removing the head from, and remounting it upon, a housing the wheel will be held in a desired relationship with the head in which only given items can pass through the wheel in response to the next deposit of a coin in an actuation mechanism and rotating of a drive gear of the mechanism and driven gear therewith through an actuation cycle corresponding to the dispensing cycle.