I've been working on some other things the last few weeks. Now back to this machine, I'd like to ask if any of the mechanically inclined people here could share anything about this interesting bobbin hook movement?
It is based on the paths of two circles, different sizes, with different centers, the smaller circle located close to the edge of the larger circle. The orbits are tied together producing a one-to-one rotation with each other, but the smaller circle has a distorted timing, speeding up and slowing down within each rotation. All other rotary machines I've seen seem to have hooks that turn at two times per needle stroke. I've only seen this design associated with White machines or machines related back to White.
It seems a novel and clever movement. It is as different in design and operation from modern rotary hooks as an oscillating hook would be. I'm wondering how it fits into the evolution of things. The design doesn't seem to have survived and I'm curious why.
John