Tooling Vacuum unit

The invention discloses a tool vacuum device for a circuit board assembly machine (such as a printing machine). The device enables two different vacuum sources to be connected to a tool. The tooling vacuum device may be a retrofit device configured to be located on top of a standard tooling table in the machine, or may be a component of the machine, and the tooling vacuum device provides a tooling support surface for a workpiece being machined. In addition, a suction nozzle for fixing a printing screen relative to a workpiece is described. 一种用于电路板装配机（如:印刷机）的工装真空装置，该装置能够使两个不同的真空源连接到工装上。该工装真空装置可以是被配置为位于该机器中的标准工装台顶部的可改装装置，也可以是该机器的组成部分，并且，该工装真空装置为正被加工的工件提供工装支撑表面。另外，还描述了用于相对于工件固定印刷丝网的吸嘴。