Machine for forming configured jewellery chain - has two wire twisting heads inclined at 90 degrees giving interlinked helices

摘要

The machine for forming a Bismarck chain has first and second wire twisting heads alternately feeding and turning two wire helices disposed at an angle of about 90 deg. to each other. The first head adds a first helix of wire as a new link to the last link of the chain, and the second head adds a second helix of wire as a new link to the first helix. The first and second helices are cut after their formation. Thereafter, the chain is pulled upwardly away from the wire twisting heads a distance of two chain lengths. The last length in the chain is held above the wire twisting heads as the wire twisting heads feed and turn two new helices.