Many cables cannot be pulled with the winch alone. The permissible pulling forces are often exceeded. A cable feeder helps to significantly reduce all pressures and forces, allowing the cable-pulling process to run easier and faster. The V-shaped drive belts guarantee that a high degree of pushing force is transferred to the cable without damaging it.
You can see how the feeder reduces the pulling and radial forces in this diagram, even though local conditions only permit the wrong pulling direction.