Abstract: A quality control system for controlling quality of a paint target includes: an individual identification section associating a step control value and a quality control value with identification information for the paint target on the basis of the amount of movement; a state value computing section calculating a state value indicative of a paint state of the paint target on the basis of a history of a temporal change of the step control value; a learning section learning a correlation between the step control value, the state value, and the quality control value using sets of the step control value, the state value, and the quality control value; an input device receiving information on the amount of movement, the step control value, and the quality control value; and a storage device storing a set of the identification information, the step control value, the state value, and the quality control value.

Abstract: A multi-color rotary spraygun has a bell-shaped head which is supported for rotation on a front end of a casing. The front end portion of the bell-shaped head is covered with a partition wall having coating material spraying ports. A plurality of coating material lines open into the bell-shaped head at their front ends and are respectively connected to separate coating material sources at their base ends. A coating material supplied to the bell-shaped head from one of the coating material sources through one of the coating material lines is atomized and sprayed on an object through the spraying ports by rotation of the bell-shaped head. The front end portion of a cleaner line which is connected to a cleaner source at its base end is disposed in the bell-shaped head and the front end portion of the coating material lines are disposed around the front end portion of the cleaner line.