A system having a rotary output (50), comprising a drive shaft (10), a pin (90) coupled to the drive shaft (10) and an output shaft (50) coupled to the drive shaft (10). A guideway (55) is associated with the output shaft (50). Rotation of the drive shaft (10) results in rotation of the output shaft (50) and the guideway (55) and movemem of the pb (90) along a pin path. The system is prevented from providing a rotary output when the pin (90) abuts against a sidewall of the guideway (55), but permitted to provide a rotary output when the portion of the guideway (55) aligned with the pin path corresponds wilh the position of the pin (90).
