Circling root button sewing machine and attaching button method

Abstract

A sewing machine for winding thread shank to button forms winding the thread shank to the thread by disposing the both of a pair of clamping members (6) at such an interval as forming an opening part (62) wider than a prescribed stitch width and by locating a sewing needle from a part between the both clamping members of the thread for a shank and on the both sides adjacent to the fabric of the thread to the adjacency to the button. This sewing machine is provided with a pair of guide members (8) detachably provided in the opening part (62), clamping the fabric W opposite to a retaining part and disposed at such an interval as forming a threader part (82) with the interval sufficient for inserting the thread and being narrower than the prescribed stitch width. The control device controls respective driving devices to locate the sewing needle in the both sides from the adjacency to the side of the button side of the pair of guide members (8) of the thread to the adjacency to the button and form the stitches to the button-neck thread. Thus the invention can prevent the lowering of a sewing quality while suppressing the stretching of a fabric when sewing a button to a relatively stretchy fabric such as a knit and winding a thread shank.

Description

technical field [0001] The present invention relates to a stitching sewing machine and a stitching method using the stitching sewing machine. Background technique [0002] A conventionally known stitch sewing machine sews a button on a cloth, and then winds a thread around a root thread (sewing thread) between the button and the cloth to form a stitch (for example, see Patent Document 1). [0003] When the staple sewing machine is used to stitch the cloth, as shown in FIGS. 9 to 11 , the cloth 116 is set in a state in which the front end 111 a of the tongue member 111 is wrapped, and this state is maintained. The front end portion 111 a of the tongue member 111 is brought close to the support base 112 . A tongue sensor (not shown) is provided in the vicinity of the support base 112 , and the tongue 111 can be driven by the tongue driving cylinder 118 by detecting the front end 111 a of the tongue 111 with the tongue sensor. It is pulled until it comes into contact with the...

AI Technical Summary

Problems solved by technology

However, since the sewn object formed by the easily stretchable cloth such as knitwear has different elongation directions depending on the installation position of the button 115, it is necessary to leave a margin to determine the needle drop position so that it does not lie on the cloth 116. As a result, the stitching around the root cannot be formed from the vicinity of the fabric 116

[0008] In addition, in order to fix the root thread 114 of the root thread 116 on the cloth 116 when performing the root thread sewing, before the root thread sew, it is necessary to close the knotted part C of the root thread 114 of the cloth 116 (Fig. 10 ). Point A in the above) to form a stitch, but when the needle drop is performed in a manner that aligns with the fabric 116 and avoids the floating part of the fabric 116, if the needle drop of the first stitch is formed on the fabric 116 in a floating state, then Since the upper and lower positions of the cloth 116 are not fixed, the cloth 116 rises together with the needle 117 when the needle 117 rises, so that the entire loop formed under the cloth 116 also rises together with the sewing thread.

Therefore, the looper cannot catch the thread, so that the stitch cannot be formed normally, resulting in the problem that the thread and the cloth 116 cannot be fixed reliably.

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