In asynchronous assembly systems, modular pallet-transfer conveyors get the right parts to the right spot, at the right time.
The most common pallet-transfer conveyor carries pallets on twin strands of belt or chain. Each strand rides in a track within an extruded aluminum profile. The profiles are separated by space, and only the edges of the pallet are supported. The strands provide just enough friction to move the pallet. But, if the pallet encounters a gate or another pallet, it stops and the strands slide freely beneath it.