Patent ID: 6851914
Filing Date: 2005-02-08
Classification: H05K,Y10T

Abstract:
1. A component-placing apparatus for driving a suction nozzle in the rotational (θ) and vertical (Z) directions for applying suction to a component, comprising: a rotary actuator; a linear actuator comprising a stator connected to a stator of the rotary actuator such that these stators are immovable relative to each other; a spline shaft connected to a rotating shaft of the rotary actuator; a nozzle connecting shaft connected to the spline shaft for being allowed to move only rectilinearly in the longitudinal direction of the spline shaft relative to the spline shaft and having the suction nozzle disposed at the bottom thereof; a hollow holder encircling the nozzle connecting shaft with rotary bearings being interposed therebetween which allow the nozzle connecting shaft to rotate with respect to the spline shaft and connected for being driven by a mover of the linear actuator; and a linear guide for guiding the hollow holder relative to the stators of the actuators so as to be rectilinearly movable parallel to the spline shaft; wherein the mover and the stator of the linear actuator have a return spring disposed therebetween for urging the mover upwards, the return spring having a spring force which is slightly greater than the sum of the weight load of a moving part of the apparatus including the mover, the suction nozzle, and the nozzle connecting shaft, and a sliding frictional force generated between the linear guide and the spline shaft.