Welcome to Quilting Board. I think you may have a machine as shown at post #5 of
Vintage Japanese machines Post #4 shows where you can find a similar manual to download. Or post #10 has another link to a similar manual that may help so that between them you should be able to figure out how to use your machine.
Did your machine come with cams?
Janey - Neat people never make the exciting discoveries I do.