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US 4,252,071 AGranted
Apparatus for 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.
Claims10
An apparatus for stitching layers with thread to form a sewn book, the layers including a back, the apparatus comprising:
- at least one spiral needle means, said needle means including point means and thread retaining means, said spiral needle means defining a central axis and a helix angle;
- drive means for rotating said spiral needle means;
- conveying means providing for relative movement between said backs of said layers and said spiral needle means, said point means of said spiral needle means penetrating and exiting said backs of the layers to provide for sequential stitching of the layers to form a plurality of sewn layers;
- and
- drawing means for advancing said thread through said sewn layers.
2 more elements
Dependencies are inferred from the claim text.