There are several possible problems.
First, the take-up spool has a ratchet mechanism that prevents it from turning backwards. When the camera is reassembled, the pawl on this ratchet must be properly positioned. It is possible that this was not done or even that the pawl is missing entirely. If you feel adventurous, you could remove the small plate (two tiny screws) at the top of the takeup spool chamber and look. The spring-loaded pawl should be visible and it should engage the ratchet. I could be wrong, but I don't think this would cause the spacing problem you describe. It seems like it would more likely cause overlapping frames.
Second, the frame spacing system has a lot of moving parts. What is causing more film to be advanced as you go through the roll is that as film is wound on the takeup spool, its diameter increases. If the takeup spool were to rotate a full 270 +/- degrees every wind, then each crank of the advance lever will pull more film onto the spool. Kevin describes above how the measuring cylinder works to determine when one frame of film has advanced, and it would be well to heed all of his advice. If the measuring cylinder is working right, it engages an idler gear, and the effects of that action shortens the degrees of rotation of the takeup spool for the next frame. At least, that's what I think happens... If it is not working right, your spacing gets wider and wider every frame. This is a job for someone who is familiar with the mechanism, either you if you decide to educate yourself and be your own repairman or a camera repair shop with experience with these cameras.
Finally, the frame spacing is also dependent on following the loading procedures given elsewhere. So I would start there.
I enjoy using this camera with its great set of lenses. They take very good pictures once they are in working order. It does take some committment to get an old camera to that point, but I think it is worth it.
Good luck,
Doug
