Armhole double-chain stitch sewing machine

Abstract

The invention provides an armhole double-chain stitch sewing machine, capable of forming a good stitch. The armhole double-chain stitch sewing machine includes a sewing machine frame including a bed area, a vertical stand area, and an arm area. The bed portion includes a first extending portion extending from a lower part of the vertical post portion to an upstream side in a cloth conveying direction, a second extending portion extending from a front end portion of the first extending portion in the same direction as the arm portion, and a third extending portion, which extends from a front end portion of the second extending portion toward a downstream side in the cloth conveying direction. The armhole double-chain stitch sewing machine further includes an upper shaft provided in the armportion, a lower shaft provided in the second extension portion of the bed portion, an intermediate shaft provided at a lower side of the vertical post portion in the first extension portion of the bed portion, a sewing machine motor for inputting rotating force to the intermediate shaft, a first timing belt transmitting the rotational force from the intermediate shaft to the upper shaft, and a second timing belt transmitting the rotational force from the intermediate shaft to the lower shaft.

Description

technical field [0001] The present invention relates to a sending-out wrist-type double circular sewing machine having a wrist portion along the feeding direction of a cloth presser foot on a sewing machine base. Background technique [0002] There is known a so-called delivery wrist-type double circular sewing machine in which the base of the sewing machine is formed in a U-shape when viewed from above, an arm portion along the cloth feeding direction is provided, and a needle plate is provided at the front end of the arm portion. instead of sewing. [0003] The sending out wrist type double circular sewing machine 100 such as Figure 5 As shown, the sewing machine frame 101 is composed of a sewing machine base part 110, a longitudinal body part 102 and a sewing machine arm part 103. The sewing machine base part 110 has: a first protruding part 111, which is upstream from the vertical body part 102 to the cloth feeding direction the side protrudes; the second protruding po...

AI Technical Summary

Problems solved by technology

[0007] However, the above-mentioned existing wrist-type double circular sewing machine is installed along an inclined direction or a curved path from the upper shaft to the lower shaft, so the length of the timing belt becomes very long, and the influence of the stretching of the timing belt becomes smaller. Large, it is easy to produce a deviation in the amount of rotation between the upper shaft and the lower shaft, and there may be skipped stitches during sewing, etc.

[0008] For example, when a skipped stitch occurs, it is difficult to re-sewing from the middle, so re-sewing has to be performed from the beginning, and there is a problem that the working efficiency is greatly impaired.

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