Method and apparatus for sewing book blocks without blind stitch by means of hooks
AssigneeMeccanotecnica S.p.A.
InventorPaolo Martini
Life of this patent
Estimating the term…
Abstract
An embodiment is proposed for sewing book blocks. A related embodiment comprises, for each book block, forming one or more stitchings with corresponding threads ending with corresponding free loops on a last signature of the book block. The threads are brought in line with corresponding free loops and thus through them along an advancement line of the signatures. The threads are moved away from the free loops by means of corresponding hooks, with the threads sliding relative to the hooks in this phase, thereby tightening each free loop around its thread. After that, the threads are cut. A related bookbinding sewing machine and a related bookbinding plant are also proposed.
Claims16
A method for sewing signatures into book blocks in a bookbinding sewing machine, wherein for each of the book blocks the method comprises:
- forming one or more stitchings between the signatures of the book block with corresponding sewing threads by means of one or more needles and one or more crochets, wherein the stitchings comprise one or more rows of plain stitches formed by the needles and one or more rows of looped stitches formed by the crochets being concatenated to each other, the rows of looped stitches ending with corresponding free loops on a last one of the signatures of the book block,
- bringing the sewing threads, upstream of the corresponding plain stitches along corresponding feeding directions of the sewing threads from corresponding spools, each to a catching position aligned with a corresponding one of the free loops formed by the sewing thread along an advancement line of the signatures during the sewing thereof,
- bringing the sewing threads each from the catching position to a concatenation position by passing the sewing thread through the corresponding free loop along the advancement line,
- bringing the sewing threads by means of corresponding one or more hooks each from the concatenation position to a closure position away from the corresponding free loop thereby tightening the free loop around the sewing thread being passed therethrough, the sewing thread being free to slide relative to the corresponding hook during said bringing the sewing thread from the concatenation position to the closure position, and
- cutting the sewing threads each upstream of a portion thereof being tightened by the corresponding free loop along the feeding direction, the sewing threads being cut after said bringing the sewing threads each from the concatenation position to the closure position.
A bookbinding sewing machine for sewing signatures into book blocks, wherein the sewing machine comprises:
- one or more spools for providing corresponding sewing threads,
- one or more needles and one or more crochets for forming corresponding one or more stitchings between the signatures of each of the book blocks with the sewing threads, wherein the stitchings comprise one or more rows of plain stitches formed by the needles and one or more rows of looped stitches formed by the crochets being concatenated to each other, the rows of looped stitches ending with corresponding free loops on a last one of the signatures of the book block,
- means for bringing the sewing threads, upstream of the corresponding plain stitches along corresponding feeding directions of the sewing threads from the corresponding spools, each to a catching position being aligned with a corresponding one of the free loops formed by the sewing thread along an advancement line of the signatures during the sewing thereof,
- means for bringing the sewing threads each from the catching position to a concatenation position by passing the sewing thread through the corresponding free loop along the advancement line,
- corresponding one or more hooks for bringing the sewing threads each from the concatenation position to a closure position away from the corresponding free loop thereby tightening the free loop around the sewing thread being passed therethrough, the sewing thread being free to slide relative to the corresponding hook during said bringing the sewing thread from the concatenation position to the closure position, and
- means for cutting the sewing threads each upstream of a portion thereof being tightened by the corresponding free loop along the feeding direction, the means for cutting being configured for cutting the sewing threads after said bringing the sewing threads each from the concatenation position to the closure position.
Dependencies are inferred from the claim text.