Method of thread stitching layers to form a sewn book
AssigneeRahdener Maschinenfabrik August Kolbus
InventorsHorst Rathert, Winfried Hedrich
Life of this patent
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Abstract
A device for thread stitching layers to form a book wherein the stitching apparatus comprises a conveying mechanism for transporting a plurality of open layers in spaced relation to each other, the conveying device transporting the layers with respect to at least one spiral sewing needle which is rotationally driven, the point of the spiral needle penetrating into the layer backs and exiting the layer backs to stitch the layers together in sequence.
Claims9
A method for thread stitching several layers to form a sewn book or the like, the layers comprising signature sheets folded to form a back, the method comprising:
- conveying the layers in spaced apart parallel relation, the backs of said layers being aligned in a plane, said layers being moved in relation to at least one spiral needle;
- rotating said spiral needle to provide for penetration and exiting of the backs of the layers by the spiral needle, said spiral needle being rotated at a speed and having a helix angle which is coordinated with the spacing and the speed of advancement of the layers, the spiral needle stitching the plurality of layers with thread to provide a plurality of sewn layers;
- and
- drawing the thread through the sewn layers at several points between the layers to reduce the tension of said thread.
Dependencies are inferred from the claim text.