Mechanical Delay
A tape advancement delay occurs in surface mount pick and place machines when a pneumatic or motorized feeder advances the carrier tape to present the next component. This delay is called feeder indexing latency, and it must finish before the nozzle descends to pick up the next part. If the nozzle attempts the pick before the tape completes its movement, a mispick or component damage occurs.
The latency is determined by the mechanical design of the feeder and the pitch of the tape.
Cycle Impact
Fast-moving machines with multi-nozzle heads are particularly sensitive to these feeder delays when multiple components must be picked from the same lane. If feeder indexing latency exceeds the cycle time of the head, the nozzle must wait above the feeder, which pauses the gantry. This mechanical wait time represents a major bottleneck in high-volume production.
System Compensation
System software reduces this issue by optimizing the picking sequence across different feeder slots on the bank. By alternating between different feeders, the machine gives each tape unit enough time to advance while the nozzle picks from another slot. This eliminates the effect of feeder indexing latency on the overall cycle time of the board.
