Modular middle presser foot device and sewing machine

Abstract

The invention provides a modular middle presser foot device and a sewing machine, which comprises a middle presser foot capable of moving up and down along with the up-down movement of a machine needle, a driving motor, a transmission mechanism and a support frame. The driving motor is connected with the middle presser foot via the transmission mechanism so as to drive the middle presser foot to move up and down. The driving motor and the transmission mechanism are arranged on the support frame. The support frame and a housing of the sewing machine are detachably connected. According to the invention, the driving motor, the transmission mechanism, the middle presser foot and the support frame of the middle presser foot device are integrated as an installation disassembly module that can be integrally installed on the sewing machine or integrally removed from the sewing machine. Therefore, the middle presser foot device is modular in structure, and convenient to install and disassemble. At the same time, the middle presser foot device is driven by the independently arranged driving motor. Therefore, the height and the stroke of the middle presser foot device can be freely and conveniently set. As a result, the middle presser foot device can be applied to both the thin material and the thick material at the same time. Meanwhile, the stitch seam of the device is more beautiful.

Description

technical field [0001] The invention relates to a garment sewing device, in particular to a modular middle presser device and a sewing machine. Background technique [0002] When sewing, since the hook thread mechanism of the sewing machine cannot hook the thread loop of the needle thread, a complete continuous stitch cannot be formed in the seam, and this section of discontinuous stitch is called a skipped stitch. In order to realize the anti-skip stitch function of the sewing machine, at present, it is common practice to add a set of intermediate presser foot device on the sewing machine, and the intermediate presser foot in the intermediate presser foot device moves up and down according to the up and down movement of the needle, so as to improve the sewing machine. stability. However, the current intermediate presser device has a complex structure, numerous parts, high manufacturing and maintenance costs, and rather complicated disassembly and installation; meanwhile, i...

AI Technical Summary

Problems solved by technology

However, the current intermediate presser device has a complex structure, numerous parts, high manufacturing and maintenance costs, and rather complicated disassembly and installation; meanwhile, it also has the following defects:

[0003] 1. The intermediate presser foot is driven by a single motor through a complete set of parts, or driven by the main shaft through a complete set of parts. Therefore, as long as the needle moves up and down, the intermediate presser foot will inevitably move up and down; however, in actual work, Sometimes it is necessary for the intermediate presser foot to cooperate with the needle to move up and down, but sometimes it is not necessary for the intermediate presser foot to cooperate with the machine needle to move up and down. It is cumbersome, so when the intermediate presser foot at the lower end of the intermediate presser foot device is removed, other related parts cannot be removed and remain on the sewing machine, resulting in worthless power loss of the motor, serious wear of parts, and loud sewing machine operation noise, etc. question

[0004] 2. After the stroke of the intermediate presser foot is adjusted, its stroke remains unchanged during the up and down movement (that is, during the sewing process). However, due to the uneven thickness of the sewing material, when sewing thin materials, the The presser foot may not be able to press down on thin materials, and when sewing thick materials, the pressure of the intermediate presser foot is too high and the thick materials are deformed, resulting in problems such as unsightly stitches and unstable sewing performance.

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