What would be the appropriate mechanism such that when the eccentric circle is rotating about the larger center circle the table stays horizontal? The large circular is the driver (its continuously rotating)
I need for to be a bit clearer about your question or what alternative assembly you are thinking about.
If you rotate the assembly vertical with the table on the end of the rod and depend upon the table weight to return the pin to the bottom of the stroke then the bottom half of the yolk could be eliminated.
Whats the bottom half of the yolk? Whats the yolk?
Yes the flat table will rest on the end of that piston. My flywheel will be the driver, it will be rotating and that smaller white shaft will rotate about it (1/4" offset.) Im designing a vibrating platform that will move up 0.5" and down 0.5". The weight will be 150kg (table + box load)
If you mean other than the vertical shaft, then making the yoke a rectangular plate with a horizontal slot for the pin and adding vertical rails to guide the side edges of the plate has also been used. Preferably, rollers that ride inside of slots in the guide rails are added to the top and bottom corners of the plate.
With the animation I posted, ideally I would like to keep that exact motion without having the rectangular prism (yolk). Guide rails requires precision and what not. Yes for the slot the eccentric shaft will ride in, there I will be using ball bearings.