Gas cylinder type sewing machine

Abstract

The invention provides a gas cylinder type sewing machine which is capable of obtaining fine processing in sewing of a barrel-shaped lower hem of a multi-layer folding clothing material. A clothing material feeding mechanism for the gas cylinder type sewing machine comprises a first feeding tooth which is arranged at one side of a needle dropping position of a sewing needle of a gas cylinder part and capable of conveying a sheet part along a clothing material feeding direction from one resisting side of the sheet body and the below, a second feeding tooth which is arranged at one side reverse to one side of the first feeding tooth opposite to the needle dropping position of the sewing needle and capable of conveying the lower hem along the clothing material feeding direction from one resisting side of the lower hem and below, and an intermittent feeding roller which is arranged at the side of the sewing needle in a mode of moving up and down and capable of intermittently conveying the lower hem in the clothing material feeding direction from the above and one resisting side of the lower hem; The gas cylinder type sewing machine can be regulated through the feeding amount of the sheet conveyed by the first feeding tooth, the feeding amount of the lower hem conveyed by the second feeding tooth and the feeding amount of the lower hem conveyed by the intermittent feeding roller.

Description

technical field [0001] The present invention relates to a cylinder type sewing machine for sewing tubular parts of clothes such as trouser hems. Background technique [0002] A cloth feeding device of a sewing machine is known, comprising a sewing needle and a pair of upper and lower intermittent feed rollers arranged on the side of the sewing needle, and the cloth feeding device can use mutual The pair of upper and lower intermittent feed rollers rotating at different rotation speeds presses the cloth while conveying the cloth to the bottom of the sewing needle, thereby performing three layers of hem on the hem of the trousers. Rolled hemmi (For example, refer to Patent Document 1 and Patent Document 2.). [0003] However, in the cloth feeding device of the sewing machine, the pair of upper intermittent feed rollers and the lower intermittent feed rollers only convey the hem that forms a three-layer hem while pinching, so the piece connected with the hem is only Move with...

AI Technical Summary

Problems solved by technology

Therefore, there is a problem that, due to differences in the stretchability, thickness, material, etc. of the cloth, there is a hem that can adjust the speed with the pair of upper intermittent feed rollers and lower intermittent feed rollers, and the sheet does not move at an appropriate speed. If it moves, the fabric will wrinkle or loosen, which will lead to a decrease in the quality of the sewing process

Therefore, it is difficult to adjust the speed of the hem around the needle dropping position of the sewing needle depending on the stretchability, thickness, material, etc. of the fabric.

Therefore, the hem may not be conveyed at an appropriate speed, and the fabric may become wrinkled or slack, resulting in a decrease in the quality of the sewing process.

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