A book called Singer and the Sewing Machine: A Capitalist Romance by Ruth Brandon (copyright 1996) should help with your research. It is available on amazon.com. An older version from the 1970's called A Capitalist Romance: Singer and the Sewing Machine (for some reason they switched the name) may be available at your local library.
My 4th Great Grandmother, Elizabeth Singer, was the sister of Isaac Singer (inventor of the Singer Sewing Machine). I would be very interested in hearing from you or anyone else with a link to this family.