Sewing machine

Abstract

The invention provides a sewing machine, comprising a lower feeding mechanism. The lower feeding mechanism has a feed dog which does reciprocating motion front and back and up and down. An upper end of the feed dog has a lower feeding portion. The lower feeding portion is used to contact with a lower layer cloth, and drive the lower layer cloth to move forward. The sewing machine also comprises anupper feed mechanism. The upper feeding mechanism has cloth feeding presser feet which does reciprocating motion front and back and up and down. The lower end of the cloth feeding presser foot has anupper feeding portion. The upper feeding portion is used to contact with an upper layer cloth, and drive the upper layer cloth to move forward. In the sewing machine, the upper feeding mechanism feeds the upper layer cloth forward, and feeding delay of the upper layer cloth is effectively prevented, so that staggered layer phenomenon occurred between the two layers of cloths is eliminated, and sewing quality is guaranteed.

Description

technical field [0001] The present invention relates to a sewing machine. Background technique [0002] At present, when ordinary sewing machines sew cloth, workers usually need to hold the cloth with their hands, so as to ensure that the cloth is fed forward according to the required direction under the action of the cloth feeding mechanism of the sewing machine. When sewing at high speed, skilled workers are required to operate in order to match the sewing speed of the sewing machine. Therefore, the technical level of workers is relatively high. In the prior art, the cloth feeding mechanism of the sewing machine includes a tooth frame located under the bottom plate of the sewing machine and a cloth feeding dog mounted on the tooth frame. It protrudes upwards from the slot of the needle plate and touches the fabric to move the fabric forward. [0003] When the sewing machine splices and sews two pieces of fabric, it needs to ensure that the relative positions of the two p...

AI Technical Summary

Problems solved by technology

However, during the sewing process, the feed dog in the sewing machine only contacts the lower layer of cloth, and the upper layer of cloth only contacts with the presser foot in the sewing machine. Because the fabric itself has a certain degree of elasticity and ductility, the lower fabric can be fed forward well under the action of the feed dog, and the upper fabric is fed forward by the lower fabric. When the gap between the upper fabric and the lower fabric When the friction force is insufficient, it is easy to slip between the upper layer of fabric and the lower layer of fabric, so that the forward feed of the lower layer of fabric is greater than the forward feed of the upper layer of fabric, which leads to the delay of the feeding of the upper layer of fabric, resulting in a gap between the upper and lower layers of fabric. Staggered layers will eventually directly lead to the deviation of the ends of the two pieces of fabrics due to the staggered layers during the sewing process, so that the sewing quality cannot be effectively guaranteed

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