SU1463506A1 - Method of forming stitch in centre-fold sewing of books and booklets with thread on book sewing machine - Google Patents

Abstract

FIELD OF THE INVENTION The invention relates to the printing industry, in particular, to stitching books and brochures on sewing machines. The purpose of the invention is to increase the reliability of stitch formation. The method of stitch formation includes inserting a sewing needle with a thread and a hook into the previously punctured holes in the fold of the notebook, removing the thread loops from the sewing needle with the gate and transferring it to the hook, casting the loop to the hook by swinging the gate and tightening the loop. When translating the loop by the gate to the hook, the branches of the loop are under the hook, and before casting the loop each branch is placed on opposite sides of the hook. 5 il. (L

Description

This invention relates to the printing industry and can be used in sewing machines for sewing books and brochures.

The aim of the invention is to improve the reliability of stitch formation.

FIG. 1-5 are diagrams of characteristic stitch formation phases.

A sewing needle 1 with a thread and a hook 2 (FIG. 1) are inserted into the holes punched in the folding of the notebook 3. The loop of the thread is removed from the needle by the gate 4 and transferred to the hook so that the branch of the thread 5, walking from the eye of the needle to the gate, is located on one side of the common plane of needle and hook, and the branch of thread 6, and from the hole in the fold of the notebook to the gate , on the other hand (Fig. 2). The hook is held at this time over

branches of the thread, and after passing the gate, is inserted between the branches of the thread (Fig. 3) so that the branch of the thread going from the needle to the gate is located opposite the open hook hook, and the thread going from the hole in the seam to the gate is from the back (fig. 4). After the hook is placed between the branches of the thread by swinging the gate, one thread is thrown onto the hook (Fig. 5) and the loop is tightened, the needle is withdrawn and the hook is from the notebook fold.

Thus, due to the location of the hook between the two branches of the thread before putting the loop on the hook, both hooking of the two branches of the thread and the premature retraction of two branches from the hook gap are eliminated. The operation of separating the two branches of the thread

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by inserting a hook between them before looping the loop onto the hook, it increases the reliability of stitch formation and, as a result, the quality of stitching.

Claims (1)

Invention Formula The method of stitch formation in case of sewing of books and pamphlets with threads on sewing machines, including inserting a sewing needle with thread and a hook into the previously punctured holes in the fold of the notebook, removing the thread loop from the sewing needle by the gate and transferring it to the hook, casting the loop on the swing rope With a gate and tightening of the loop, characterized in that, in order to increase the reliability of stitch formation, when transferring the loop to the hook, its branches are placed under the hook, and in front of the loop and the hook on the hook one branch is placed on the side of the hook mouth, and the other the back of his hand. figure 1 eri 2.g In id 5 FIG. FIG. 2 FIG. five