Sewing machine

Abstract

The present invention corrects the curl of the sewed object. The sewing machine includes first and second lower nozzle ports (311, 321) which are located at the lower side of the sewed object, and eject air at the upstream in the feeding direction of the sewed object relative to the drop needle positions (P1, P2) and the drop needle position side relative to the end part of the sewed object subjected to sewing toward two different directions of the end portion side. The first and second lower nozzle ports are at the upstream side of the feeding direction of the sewed object. The ejection direction of the first lower nozzle port (311) is orthogonal to the feeding direction of the sewed object when viewed in plan view, and the ejection direction of the second lower nozzle port (321) is inclined with respect to the feeding direction of the sewed object when viewed from above. The curl generated at the end side portion of the sewed object can be effectively horizontally extended by ejecting the air in two different directions, and the sewing can be performed without sewing the edge portion.

Description

technical field [0001] The present invention relates to a sewing machine suitable for sewing curled objects. Background technique [0002] Depending on the material of the object to be sewn, sometimes curls are likely to occur at its edge, and if the object to be sewn is directly sewn by a sewing machine, the needle may be dropped from above the curled portion and sewed directly. If the curled edge portion is sewn in as described above, the sewn object must be discarded, or all the sutures must be dismantled and re-sewn, and in any of the above cases, a very large loss will be caused. [0003] Therefore, in the existing sewing machine, the end edge of the object to be sewn composed of the upper cloth and the lower cloth is clamped while using the three cloth guide plates protruding from the front end to the upstream side of the cloth feeding direction. In feeding, the edge part after curling is corrected by the side edge part of a cloth guide plate, and sewing is performed ...

AI Technical Summary

Problems solved by technology

[0005] However, since the above-mentioned conventional sewing machine feeds the cloth while clamping the cloth with the three cloth guide plates, the material to be sewn is stretched when the cloth is fed, which may adversely affect the sewing quality.

[0006] In addition, the edge of the curled material is directly clamped by the three material guide plates, which may lead to poor feeding and unstable sewing operation.

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