A support structure is provided for the bending roller to facilitate a movement thereof to effect {HEAD ~ not only a cylindrical bending} of {TAIL ~ the strip material} but also, and upon a swivelling of the bending roller, a cylindrical as well as an increasing diameter spiral can be formed 
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A support structure is provided for the bending roller to facilitate a movement thereof to effect { HEAD ~ not only a cylindrical bending } of { TAIL ~ the strip material } but also , and upon a swivelling of the bending roller , a cylindrical as well as an increasing diameter spiral can be formed
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH