Coiling root button attaching sewing machine

Abstract

This thread shank winding button sewing machine sews a button to a fabric and then winds a thread around button stitches to form the shank. This thread shank winding button sewing machine is provided with a needle bar vertical mechanism vertically moving a needle bar; a fabric retainer part retaining the fabric; a button retainer mechanism retaining the button in such a manner as being freely changed into a horizontal state and a perpendicular state; a relative position change mechanism changing the relative position among the needle bar, the fabric and the button; and a control device controlling the needle bar vertical mechanism, button retainer mechanism and the relative position change mechanism. The control device controls the needle bar vertical mechanism and the relative position change mechanism such that, after the thread is wound around the button stitches near the fabric at least once, the thread is wound therearound near the fabric at least once, before performing a threadshank sewing. To provide a thread shank winding button sewing machine forming a beautiful thread shank part.

Description

technical field [0001] The present invention relates to a button wrapping sewing machine which forms a wrapping thread on the stitched thread (root thread) while sewing buttons to cloth. Background technique [0002] Conventionally, it is known that after the button is stapled to the fabric, the button is floated from the fabric by further wrapping the suture around the suture (root thread) between the button and the fabric (root thread), thereby improving the appearance of the button. A threaded button sewing machine for sewing beautiful buttons (for example, refer to Patent Document 1). [0003] like Figure 10 As shown, in this wraparound button sewing machine 100, a tongue handle 101 for holding a cloth c and a button holding unit 102 for holding a button b are provided. The tongue shank 101 keeps the button-stitching portion of the cloth c in a bent state with respect to the lifting path of the needle 103 . [0004] On the other hand, the button holding unit 102 is pr...

AI Technical Summary

Problems solved by technology

[0010] Here, when switching from blind seam to sewing around the root, the thread t must be cut temporarily, but the cut thread t, such as Figure 12 As shown in (a), since the front end is not fixed, it cannot be wound reliably when performing the wrapping sewing, and as a result, the appearance of the wrapping will be impaired

[0011] On the other hand, thread t must also be cut after wrapping sewing is finished, however, if Figure 12 As shown in (b), since it is difficult to automatically cut off the front end of the thread t so that it does not protrude from the root part, it also detracts from the appearance of the root part.

[0012] In addition, in order to stably float the button b from the material c, one button b may be sewn several times around the root, but if all the stitches are carried out at the same pitch, the overall threading will change. Coarse, resulting in an unsightly look around the root

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