Uper and lower conveying sewing machine and thread adjuster

Abstract

A sewing machine with up and down conveying, which has an upper fabric conveying mechanism for conveying the upper fabric and a lower fabric conveying mechanism for conveying the lower fabric, by changing the difference in the conveying volume of the two conveying mechanisms, the amount of pleats performed on the sewn fabric is adjusted. The utility model has a thread adjusting device driven by an electric drive device capable of changing the thread tension, and a control mechanism for controlling the thread adjusting device to change the thread tension corresponding to the amount of pleating. It has a setting mechanism capable of setting the set value of the thread tension corresponding to the amount of pleats received; the control mechanism controls the thread adjusting device corresponding to the amount of pleats received, so that it can give the thread tension of the set value set by the setting mechanism. This type of vertical feed sewing machine can always sew with the optimum thread tension even if the amount of gathers varies in the continuous sewing section.

Description

technical field [0001] The present invention relates to a vertical feed type sewing machine capable of sewing while tucking in (easing, shrinkage seam). Moreover, the present invention also relates to a thread adjusting device of a sewing machine for giving thread tension. Background technique [0002] At present, people know that there is a kind of upper and lower sleeves that can be sewed while performing the pleats while the sleeves are on, as disclosed in the Japanese Patent Publication No. 4-66598 or the Patent Publication Publication No. 3-37958. Conveyor sewing machine. [0003] The term "pleating" here refers to, for example, when sewing a three-dimensional shape such as a suit sleeve, by making the feeding amount of the outer fabric (upper fabric) larger than that of the inner fabric among the two overlapping fabrics to be sewn. (Lower fabric) conveying amount, forming a seam that makes the outer fabric have a certain amount of excess. [0004] Generally speaking...

AI Technical Summary

Problems solved by technology

[0010] In addition, the thread adjusting device of the existing sewing machine has the problem of unstable thread tension

[0011] That is, in the thread adjusting device of the sewing machine in the past, since the pressure plate member opposite to the thread adjusting disc is pressed on the ridge of the inner hole of the thread adjusting disc with the axis center of the driving rod as the normal line, When the plate part is tilted, the pressure on the pressure plate part of the thread adjustment plate is not uniform

The result is instability of thread tension

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