The take up spool is gear driven from the sprocket shaft it can stop because there is not enough friction or because there is a gear fault.
If you have the top off you need to check
- that the gears and bushes are not too badly worn
- that the gear teeth are not offset and only overlap by 40% or less
The take up spool gear teeth can ride too high relative to the gear that drives it, the take up spool is not located (properly) in the axial sense, from new or after lots of wear.
If the gears slip out of alignment there will be grinding noises and probable physical damage. I dont think you have this problem.
If the take up spool (clutch friction) does not keep the film tightly wound (enough) then the film will get folded up and cause problems, you seem to have this problem.
The friction on the clutch needs to be high and low enough to tension the film both:
- when the first frame has to be wound on and the take up spool diameter is small and not much slippage will occur, the take up spool is only just turning fast enough to keep up with the sprocket shaft to avoid slack, if it slips the film will fold up.
- when the 35th frame has already been wound on and the diameter of the tightly wound 34th to 1st frame is large, and more slippage is needed, to avoid film tearing, as the sprocket shaft turns at the same rate as before but the take up has to turn a lot slower, by slipping at the clutch, or damage the film.
My cameras tend to damage sprocket holes after 30 frames or as the friction is set too high... if I back off the film will crumple rather than wind on, difficult to manage an in between friction. Some of the Ru people say retension the spring, cannot do that easily
Yours seems to be too low in friction, it is a difficult compromise, to judge and achieve.
When you are rewinding only the sprocket drive is declutched (free) you need to rewind the film against the tension in the friction clutch, it is possible to pull film from the cassette spool if you load your own, mine Kievs can do that.
Noel
