Sewing machine with a tensioning device having a plurality of te

Details Sewing machine with a tensioning device having a plurality of te Sewing machine with a tensioning device having a plurality of te

1989-02-21

1989-11-28

Nerbun, Peter

Sewing

Special machines

Tube forming

11212126, 112153, 112305, 112306, D05B 3506, D05B 3510

Patent

active

048830054

ABSTRACT:
In order to permit a reliable alignment, in the direction transverse to the direction of rotation, of the edge 5 of the opening of a tubular workpiece 4 of medium-heavy to heavy sewing material which is drawn with considerable pre-tension over a tensioning device 3, each of the tensioning rollers 6, 7, 8 belonging to the tensioning device 3 has at least three alignment members 15 distributed uniformly over its circumference. Each alignment member 15 has an engagement side with a gripping surface. After optically scanning the edge 5 of the opening of the workpiece 4, one or more of the alignment members are displaced by a pulsating action of a pressure fluid, radially and axially, in the tensioning roller 6, 7, 8. In this way, the gripping surfaces of the alignment members 15 grip the inner side of the tubular workpiece 4 and displace it transversely to its direction of rotation.

REFERENCES:
patent: 4467734 (1984-08-01), Rohr
patent: 4602579 (1986-07-01), Pollmeier et al.
patent: 4827856 (1989-05-01), Rohr

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