Need help understanding a scotch yoke lift (GBC)

[Huaojozu]

So I've seen a couple of vids like this one where a scotch yoke mechanism is used to create a lift module in GBC. Unfortunately, none of the videos include a clear view of the mechanism or an explanation, apart from the brief obvious one. I am looking to understand in-depth how this works, especially what pushes the loaded ball upwards to make the entire column rise. I understand the moving part includes some blocks to prevent the column from falling again, but I'm not getting how it rises in the first place. The movement seems entirely horizontal to me which makes the vertical motion perplexing.

I'm sure more experienced GBC builders will think this is obvious but if anyone is able to explain the vertical motion part or model it in LDD, that would be awesome.

[Saberwing40k]

@nico71 includes plenty of pictures on his website regarding this thing.

http://www.nico71.fr/gbc-spiral-ball-lift/

Thing is, I think you explained it yourself. A Scotch yoke actually has both a vertical and horizontal component. The cam that actuates the mechanism also lifts the ball.

[mocbuild101]

This video (not mine) should be enough to explain it:

 

[RohanBeckett]

Build Nico71's one.. he has instructions.. it's a quick easy build...  and then you'll understand.

I made a modification to the one I built - a small catch, to prevent the whole column of balls lifting/dropping on every cycle, where a ball isn't being fed in (idling)

 

in the GBC world, these are typically called a ball pump.. google them for plenty of other examples