Does this resemble the Hengstenberg-Anker shuttle path?
Coming back to look at these photos again, the unusual path of this vibrating shuttle made me think of a Hengstenberg-Anker machine in my collection. It is a transverse shuttle machine, from around 1900, but has a similar arching left to right motion. According to my notes this short arc shuttle movement was designed by Wittier of Bielefeld, Germany. Apparently another machine called 'Mother's Help' was nearly identical.
It's fascinating that this old and rarely seen mechanism showed up many years later, with a VS.
I took a photo of the underside but cannot attach it because it comes through much too large. Must figure out how to fix that.
Dianne in Colorado