Upper and lower synchronous feeding mechanisms of thin-material lockstitch sewing machine and feeding method thereof

Abstract

The invention relates to upper and lower synchronous feeding mechanisms of a thin-material lockstitch sewing machine and a feeding method thereof. The mechanisms are designed aiming at that the similar product mechanisms are not easy to adjust and high in synchronous feeding difficulty. The design key points of the mechanisms are that the upper pin shaft hole of an upper feeding oscillating plate seat is connected to the housing of the lockstitch sewing machine through a pin shaft, while swinging around the pin shaft, the upper feeding oscillating plate seat drives the upper synchronous feeding mechanism to change the swing amplitude so as to change the distance of travel of upper feeding teeth, a lower feeding oscillating plate seat swings around the pin shaft and thus drives the lower feeding mechanism to change the swing amplitude and also to change the distance of travel of lower feeding teeth, a synchronous connecting rod eccentric pin and a synchronous connecting rod are provided so that the upper and lower feeding teeth move synchronously, and under the error influence of the upper synchronous feeding mechanism and the lower synchronous feeding mechanism, the center distance of the synchronous connecting rod is adjusted by the synchronous connecting rod eccentric pin so that the upper synchronous feeding mechanism and the lower synchronous feeding mechanism run synchronously. The manufacturing cost of the upper and lower synchronous feeding mechanisms of the thin-material lockstitch sewing machine is low, the feeding method is feasible, the labor efficiency is effectively improved, and therefore, the upper and lower synchronous feeding mechanisms and the feeding method are suitable for popularization and application.

Description

technical field [0001] The invention relates to an industrial sewing machine, which belongs to an upper and lower synchronous feeding mechanism of a thin material lockstitch sewing machine. technical background [0002] At present, the upper and lower differential feeding mechanisms are generally used in the field of traditional thin material industrial lockstitch sewing machines. Such upper and lower differential feeding mechanisms are disclosed in Chinese patent documents with application number 200910045716.2, authorized announcement date 2012.11.14, and invention name "The upper differential feeding mechanism of sewing machine with shrinkage function and the upper feeding wrinkling mechanism using the mechanism"; the upper differential feeding mechanism includes presser foot swing shaft, crank, presser foot swing crank, cloth feed shaft, cloth feed crank , crank connecting rod, presser foot connecting rod Ⅰ, presser foot connecting rod Ⅱ, outer presser foot; also include...

AI Technical Summary

Problems solved by technology

However, the above-mentioned mechanisms are complex, difficult to adjust, and costly. They are not suitable for popularization and use, and it is difficult to meet the needs of most clothing manufacturers for the complete synchronization of upper and lower cloth feeding.

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