Staggering preventing device of sewing material and overlock sewing machine

Abstract

The invention provides a staggering preventing device of a sewing material. The staggering preventing device comprises a tooth rack provided with a fixed swinging supporting point, a feed dog arranged at one end of the tooth rack, a rotatable eccentric shaft and a driving mechanism for driving the eccentric shaft to rotate, wherein a first sliding groove is formed in the other end of the tooth rack; the fixed swinging supporting point of the tooth rack is located between the feed dog and the first sliding groove; the eccentric shaft comprises a shaft body part and a shaft eccentric part which is eccentrically arranged on the shaft body part; the shaft body part is connected with the driving mechanism; the shaft eccentric part is rotatably mounted in the first sliding groove of the tooth rack and is in sliding matching with the first sliding groove; when a presser foot is lifted or after the presser foot is lifted, the driving mechanism drives the tooth rack to downward move toward one end of the feed dog on the tooth rack through the eccentric shaft, so that the feed dog is descended to the lower side of a needle plate; a distance between the needle plate and the presser foot in a feeding process before sewing is enlarged and the sewing material is not in contact with the feed dog, so that the material is convenient to feed; a condition that the sewing material has staggering and layering phenomena before sewing can also be avoided.

Description

technical field [0001] The invention relates to garment sewing equipment, in particular to a sewing material anti-slip device and an overlock sewing machine provided with the sewing material anti-slip device. Background technique [0002] At present, when various types of sewing machines (including lockstitch sewing machines, overlock sewing machines, interlock sewing machines, etc.) are designed, there is a fixed distance between the presser foot and the needle plate in the sewing machine, and in most types of sewing machines, The distance between the above-mentioned presser foot and the needle plate is relatively small. As we all know, the sewing machine generally needs to lift the presser foot upwards before sewing, and then feed the sewing material between the presser foot and the needle plate. When the movement reaches the highest point, under normal circumstances, the feed tooth is about 1mm higher than the needle plate, which makes the distance between the presser fo...

AI Technical Summary

Problems solved by technology

[0003] When sewing relatively thick sewing materials, the feeding process of feeding the sewing materials between the presser foot and the needle plate before starting to sew will be very laborious. During the feeding process before sewing, a large friction force will be generated between the feed dog and the sewing material, which will easily cause the phenomenon of layering and delamination of the sewing material itself before sewing, which will greatly reduce the sewing quality.

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