Eccentric

[webby2]

this is my mechanical build as it is evolving.
I needed to find out what I needed to do to get it to lock every time without any other parts, and well this version does just that.

[webby2]

here is the system opened up to make it easy to see how simple this device is.
The silver cap in the center is the "pin" that the ring gear rotates around.

So simply put any sun to ring offset distance that is greater than 20mm will cause this to lock into mesh, there is a side effect of the tensile force between the sun to ring and then the ring to pivot via the arm that creates a very high force, this force is what forces the arm to rotate in sync with the sun gear, with no load or resistance on the pivot then the only force that is made with that is the force to make the arm follow the mesh.

[webby2]

One point that I will make is that the force is BETWEEN the RING gear and the PIN,, this is kind of very important to understand, that point stays within the closed system and becomes an integral part of the function of the system.