The Aesus Star capper uses a starwheel to transport the containers under a spinning placing station. Then the container is indexed to a second (or even a third) torqing station where the final torqu is provided.
A magnetic slip clutch can ensure a consistent torque is applied.
Recirculation devices can be supplied so that in the unlikely event a cap is not applied the container can be re-circulated for an aditional attempt. If a cap is mis applied sensors are available to reject the container onto a reject table.
The feed can be using a vibratory bowl or a sorting elevator depending on cap charateristics.