3D cam conveyor structure design of die bonder leadframe

It was discussed the leadframe driving structure moving along line intermittently, especially the principle of the 3D cam in the designed die bonder. The driving part was controlled to fulfill scheduled moving rules by curves of the 3D cam contour in XY plane and Z direction. The contact structure was designed as two side slopes where contacted with the moving part of the 3D cam, by which the branched wrist rack could be forced by the two slopes and Z direction. In addition, the branched wrist rack could rotate around its geometrical center axis, adjusting the contact state between the rollers and the cam contour automatically, so as to suit the turning movement of slope contour of the 3D cam. In the machining process, the cam blank was installed on the XY working platform of a NC milling machine, and the contour of the 3D cam could be machined. The conveyor system can make the indexing claw insert the leadframe, move forward, locate laterally, move back slight, exit from the leadframe, and return to the start point in a circulation manner.