动臂式贴片机（也称拱架型贴片机）的拾取/贴装头的四轴控制，X，Y轴为水平面方向运动，Z轴为拾取/贴装头拾取、贴装芯片方向运动，U轴为调整芯片角度方向旋转运动-Boom-type placement machine (also called the Gantry-type placement machine) and pick up/placement head of the four-axis control, X, Y-axis is horizontal directions, Z axis