Abstract: A work mounting apparatus has a head drum rotated in one direction, work heads arranged on the outer periphery of the drum, each work head including a suction nozzle projecting from the work head toward a circular travel path, for moving along the travel path while keeping a fixed orientation and repeating a cycloidal motion during rotation of the head drum, a work feeder arranged on the travel path, and a movable table arranged on the travel path at a distance from the work feeder, for receiving thereon a printed board, wherein the suction nozzle of each work head sucks up a work from the work feeder and releases the sucked work at a desired release position on the travel path. The movable table is moved along a line intersecting the travel path, whereby a target point on the printed board, at which the work is to be mounted, is brought to the release position on the travel path, in cooperation with cycle control of the cycloidal motion of the work head.

Abstract: In a parts mounting apparatus, suction nozzles are mounted on a rotating carrier driven by a motor. With rotation of the rotating carrier, parts are sucked by the nozzles at a feed station and carried to a mounting station where the parts such as electronic parts are mounted on substrates, for example. A counter counts output pulses from an encoder mounted in the motor driving the rotating carrier. A microcomputer determines the rotational speed and rotational position of the rotating carrier from the count value of the counter. Based on the result of the determination, the microcomputer calculates a timing for delivering a signal for switching the nozzles between two different pneumatic states.