Method and assembly for producing protective covers for mattress

Details Method and assembly for producing protective covers for mattress Method and assembly for producing protective covers for mattress

1989-08-18

1991-07-16

Schroeder, Werner H.

Sewing

Elements

Frames

11212112, 11212114, 11212126, D05B 3302, D05B 1900, D05B 2500

Patent

active

050315536

ABSTRACT:
With a method for completely automatic products of fitted sheets, elastic bands are sewn into or onto the cut edges (transverse edges), and the lengths of the elastic bands correspond approximately to the widths of the pieces of fabric. Then the widths of the pieces of fabric are measured and, dependent upon the results of this measurement, a piece of fabric is positioned in the middle or symmetrically in relation to the sewing needles of four sewing devices for formation of the corner seams, and the needles are provided in pairs facing each cut edge (transverse edge) of a piece of fabric at a corner processing station. Thereafter, the piece of fabric is hemmed in the corner of processing station parallel to its cut edges (transverse edges) and the hems of the piece of fabric are fixed. The longitudinal edges of the piece of fabric positioned in the corner processing station are then scanned, and dependent upon the scanning, the alignment of the sewing trajectories of the sewing assemblies occurs for the formation of corner seams at the points of intersection of the elastic bands or cut edges with the longitudinal edges of each relevant piece of fabric. Finally, corner seams are formed along the predetermined sewing trajectories and the excess corners of the piece of fabric and excess ends of the elastic bands are separated and removed adjacent to each corner seam.

REFERENCES:
patent: 4271774 (1981-06-01), Burton
patent: 4292908 (1981-10-01), Blessing
patent: 4512269 (1985-04-01), Bowditch
patent: 4594956 (1986-06-01), Vartoukian
patent: 4607582 (1986-08-01), Brocklehurst
patent: 4682555 (1987-07-01), Bierbaum
patent: 4748922 (1988-06-01), Bierbaum
patent: 4785750 (1988-11-01), Best

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