Animating Winch & Winch Rope

Hi
Does anyone have any clues how to do an animation of a winch wherethe rope is coming off the rotating drum and the diameter isgetting smaller as rope is getting longer (and diameter gettinglarger for winching in and rope getting shorter)
Can you do this by configurations or design part in assembly?
Any help appreciated
Thx
KENSolidworksMotion Studies