Sewing machine

Abstract

The invention provides a sewing machine which comprises a main shaft, a feed dog fixed to a feed frame, a feed lifting transmission assembly connected between the main shaft and the feed frame, a pressing rod, a presser foot installed at the lower end of the pressing rod, a presser foot lifting driving source, a presser foot lifting transmission assembly connected between the presser foot lifting driving source and the pressing rod, and a feed lowering transmission assembly, wherein the output end of the presser foot lifting driving source is connected with a feed lifting transmission part in the feed lifting transmission assembly through the feed lowering transmission assembly. When the sewing machine stops taking and placing sewing materials, a machine needle is located above a needle plate, the presser foot lifting driving source acts, the presser foot lifting driving source enables the presser foot to be lifted upwards through the presser foot lifting transmission assembly, and the presser foot lifting driving source further enables the feed frame and the feed dog to move downwards to the position below the upper surface of the needle plate through the feed lowering transmission assembly. Therefore, the feed dog cannot influence the sewing materials placed on the needle plate, the sewing materials can enter and exit more conveniently, and the sewing materials can be prevented from being scratched, so that the sewing quality is guaranteed.

Description

technical field [0001] The present invention relates to a sewing machine. Background technique [0002] Existing sewing machines generally include a main shaft driven by the main shaft, a tooth lifting shaft and a feeding shaft parallel to the main shaft, a needle bar extending up and down, a machine needle installed at the lower end of the needle bar, a tooth frame, and a tooth frame fixed on the tooth frame. Feeding tooth, wherein the main shaft is connected with the tooth lifting shaft through the first tooth lifting transmission assembly, the tooth lifting shaft is connected with one end of the tooth frame through the second tooth lifting transmission assembly, the main shaft is connected with the feeding shaft through the first feeding transmission assembly, and the feeding shaft The second feeding transmission assembly is connected with the other end of the tooth frame, and the main shaft is also connected with the needle bar through the needle bar transmission assembl...

AI Technical Summary

Problems solved by technology

However, due to the synchronous interlocking relationship between the machine needle 100 and the feed dog 300, when the machine needle 100 is located above the needle plate 400, the feed dog 300 also protrudes upward from the alveolar of the needle plate 400, that is, a part of the feed dog 300 is exposed upward. Due to the needle plate 400, at this time, the sewing material 500 cannot be placed on the needle plate 400 evenly; at the same time, the feed dog 300 protrudes upwards from the needle plate 400, which makes it very inconvenient to enter and exit the sewing material, and is also easy to scratch the seam. material, which in turn affects the sewing quality and greatly reduces the sewing experience

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