Patent ID: 7870828
Filing Date: 2011-01-18
Classification: B42B

Abstract:
1. A device for producing thread-stitched book blocks from a stack of signatures, wherein the signatures are arranged flat one on top of the other and are stitched together by stitched seams formed at right angles to the folds by a double-stranded binding thread that passes through folds of the signatures from an outside to an inside thereof, runs along the inside edge of the folds, and passes through the folds from the inside to the outside, the device comprising for each of the stitched seams a first stitching needle for inserting the binding thread through a fold of a signature from the outside and a second stitching needle for drawing the binding thread through the fold of this signature from the inside, further comprising means for carrying the binding thread along an inside edge of the fold from the first stitching needle to the second stitching needle, and a punch needle, which passes through the fold from the inside edge to form a punched hole, is arranged opposite the first and second stitching needles, wherein a section of a needle used for piercing a fold has a polygonal cross-sectional shape.