1)AOI PCB buffer is placed after SPI/AOI process to store NG PCB in the magazine rack while transferring good PCB to the next machine in FIFO or LIFO way,

2)It can be located before and after the equipments of different working speed as a PCB board stocker.

3) The PCB buffer you can require equipped with the conveyor or not and placed back and front of the machine.

Manufacturer: ASCEN technology
This machine detail specification from  PCB buffer