How to synchronize the activity

Hi all, I am doing a work involving a robot and conveyor system. The problem is, in the second conveyor the box is not waiting till the product the lathe is kept. Right now based on the timing it is adjusted. But how to make the box wait, till the part in kept in it? I have attached the VC file and in PDF too.

Ex5.vcmx (270.2 KB)

LBEx5_1.pdf (271.2 KB)


Ex5.vcmx (268.6 KB)

Thanks a lot, after applying the filter it works. Please Can you explain the theory behind it??