…
A bit clearer:
A driven roller is clamped to a driving roller, or both can be driving, some distance from that is a second such unit. Between them is a drum that holds your rope drive. Between the drum and both of the roller units there is an installation where you attach and detach the kite tethers to the loop. To start, after you’ve wrapped the loop in the way that it should, you add kite tethers to the loop as the loop unwinds. The kites need to be flying crosswind to have it make any sense for energy production, but don’t need to for first testing of this ground station. The drum has a protrusion in the middle. To wrap the loop around the drum again, you let the loop catch on this protrusion and rotate the drum. Power is generated by the two, or four, or more, to reduce needed clamping force and with that tether wear, driving pulleys.
The two pulleys in a unit are clamped together by some spring mechanism, which both needs to be strong enough to clamp on the tether strongly enough, but also allow the pod that connects the kite tether to the loop through.
As the kites need to fly crosswind at high speed, I think they should fly in circles around the loop, which seems to necessitate a robust pod design.