Sewing method of cloth and double-chain-ring sewing machine

Abstract

A sewing method of cloth and a double-chain-ring sewing machine transfer the cloth towards a specified sewing advancing direction along an upper surface of a needle plate, and form a stitch ring at a lower side of the needle plate by utilizing two needles which keep stitching and move up and down, and catch the stitch ring through advancing of a curved needle which can advance and retreat in a direction approximately orthogonal to an up-down moving path of the needle, and utilize a looper thread maintained by the curved needle to wind the caught stitch ring, so that double-chain-ring stitch is formed on the cloth, at the moment, a movement guiding stitch diagonal member is utilized to perform movement guide to a stitch end part which is protruded onto a surface of the cloth when the stitch of the first needle begins, so as to form a state of falling and tilting towards a downstream side of the sewing advancing direction, thereby sewing and processing the stitch end part into the double-chain-ring stitch. Therefore, cut processing for the stitch end part does not cost time, thereby realizing labor saving, raising the efficiency of sewing operation and operability of the cloth, and preventing damages to the cloth.

Description

technical field [0001] The present invention relates to the end of a loop-shaped tubular fabric, which is processed into a loop without the front and rear body parts of a T-shirt, underwear, etc. A method of sewing a cloth without a thread and a double-chain-loop sewing machine used for the sewing. Background technique [0002] The following is an example of hemming sewing of a tubular material using a double chain sewing machine. The upper surface of the upper surface is moved toward the specified sewing forward direction, while using at least one needle that holds the suture and moves up and down to form a suture loop under the needle plate, and can pass in a direction approximately perpendicular to the up and down movement path of the needle. The forward and backward movement of the looper catches the loop of stitching, and the looper thread held by the looper is used to intertwine the captured loop of stitching, thereby forming the stitches of the double chain loop stit...

AI Technical Summary

Problems solved by technology

[0005] Therefore, at present, even for a skilled operator, it takes several seconds or more to manually cut off the thread end portion NTa protruding from the surface Wf of the cloth W with scissors, which makes the sewing work difficult. Efficiency decreases accordingly

In addition, there are also problems in that the degree of freedom of the operator's hand is reduced by holding the scissors, and the operability of the cloth is deteriorated. In addition, the cloth is easily damaged due to the way of using the scissors.

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