Sewing machine for up-down differential feeding

Abstract

The invention relates to a sewing machine for up-down differential feeding. The sewing machine comprises a secondary feeding adjusting mechanism, a feeding shaft and a feed lifting rock shaft, wherein the secondary feeding adjusting mechanism comprises a lower differential feeding adjusting crank and a first tooth frame seat which are fixed on the feeding shaft, a lower differential feeding crank which movably sleeves the feeding shaft and a lower differential transmission crank which movably sleeves the feed lifting rock shaft; the first tooth frame seat is connected with a feeding tooth; the lower differential feeding crank is connected with a lower differential feeding tooth; the lower differential feeding adjusting crank, a first lower differential feeding connecting rod, the lower differential transmission crank, a second lower differential feeding connecting rod and the lower differential feeding crank are hinged and linked in sequence; the hinging position between the lower differential feeding adjusting crank and the first lower differential feeding connecting rod is adjustable. The hinging position is adjusted so that a force arm relation between the lower differential feeding adjusting crank and the first lower differential feeding connecting rod is changed and a relation of swinging and transferring the feeding shaft to the feeding tooth and the lower differential feeding tooth is changed, namely the lower differential feeding adjustment is realized.

Description

technical field [0001] The invention relates to a sewing machine, which is a sewing machine with up and down differential feeding. Background technique [0002] A sewing machine is a machine that uses one or more sewing threads to form one or more stitches on the sewing material to interweave or sew one or more layers of sewing material. With the advancement of modern technology, sewing machines are becoming more and more advanced. They are no longer limited to traditional sewing techniques, but modern sewing techniques that integrate sewing and various modeling functions. For example, the authorized announcement number CN200967877Y published in the Chinese patent literature, the authorized announcement date was October 31, 2007, and the name of the utility model is "differential feeding device for sewing machine", which includes the feeding tooth frame and differential tooth on the sewing machine frame. There are feeding teeth and differential teeth respectively on the fee...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the above-mentioned shortcomings, the purpose of the present invention is to provide a sewing machine with upper and lower differential feeding to the field, so that it can solve the problem that the existing similar products do not have the functions of upper differential feeding and lower differential feeding at the same time, and the sewing style is not good. technical issues

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