Method and apparatus for changing the spiral stitch path in a tu

Details Method and apparatus for changing the spiral stitch path in a tu Method and apparatus for changing the spiral stitch path in a tu

1989-12-27

1991-10-29

Nerbun, Peter

Sewing

Special machines

Tube forming

1122622, 26 1, 26 82, D05B 2300, D06C 300

Patent

active

050605879

ABSTRACT:
A tubular fabric (4) is withdrawn from a supply roll (3), over a spreader (5), by means of a support band (11) and a pressure band (14). The spreader (5) comprises an inner longitudinal guide member (17), and an outer longitudinal guide member (18), and are mounted on the free ends of two or more telescoping tubes (22). The inner and outer guide members are urged apart by helical compression springs and are drawn together by wire cables (26). A cutting device (41), comprising at least one circular knife (43), is disposed between the engaging projections (40) of the guide members (17,18) and the next telescoping tube (22). This cutting device cuts a longitudinal slit (49) in the wall of the tubular fabric, producing two slit edges (51, 52). The lower slit edge (51) lies on the support band (11) and is pressed so as to be held down by the inner guide member (17). The other upepr slit edge (52) lies on the upper side of the inner guide member. It is deflected outwardly, away from the inner guide member in a region between the deflecting rolls (55, 56) by means of a deflecting mechanism (54). Consequently, the upper slit edge (52) passes through a longer path than the lower slit edge (51). The slit edges, which now have been mutually longitudinally displaced, are sewn back together.

REFERENCES:
patent: 2321010 (1943-06-01), Cohn
patent: 2467281 (1949-04-01), Walter et al.
patent: 2737700 (1956-03-01), Thompson
patent: 3203386 (1965-08-01), Briggs
patent: 3430589 (1969-03-01), Andrauht
patent: 3472048 (1969-10-01), Shaw et al.

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