Feed mechanism of sewing machine and sewing machine

Abstract

The invention provides a feed mechanism of a sewing machine. The feed mechanism comprises a main motor, a cloth feed motor, a feed dog frame and a feed dog fixed to the feed dog frame. The main motor is connected with the feed dog frame through a feed dog lifting mechanism. The cloth feed motor is connected with the feed dog frame through a cloth feed mechanism. The cloth feed mechanism comprises a drive connection rod, a swing connection rod and a feed dog base supported in a bottom plate of the sewing machine in a rotatable mode. One end of the drive connection rod is fixedly connected with an output shaft of the cloth feed motor, and the other end of the drive connection rod is hinged to one end of the swing connection rod. The other end of the swing connection rod is hinged to the feed dog base. The feed dog base is hinged to one end of the feed dog frame. In the feed process, the output shaft of the cloth feed motor swings once in a reciprocating mode within the regulated angle alpha, the feed dog frame and the feed dog can reciprocate twice in a front-back mode together relative to the bottom plate, and therefore the rotation direction switching frequency of the output shaft of the cloth feed motor is greatly decreased, the synchronism between drive of the main motor and drive of the cloth feed motor is ensured, and the sewing quality is improved.

Description

technical field [0001] The invention relates to a garment sewing device, in particular to a sewing machine feeding mechanism and a sewing machine. Background technique [0002] There are many kinds of sewing machines, including lockstitch sewing machines, overlock sewing machines, chain sewing machines, interlock sewing machines, etc. Among them, lockstitch sewing machines have the highest utilization rate. The sewing machine includes a stabbing mechanism, a thread hook mechanism, a thread take-up mechanism, a feeding mechanism, a winding mechanism, a pressing mechanism, etc., wherein the feeding mechanism mainly includes a tooth frame, a feeding tooth fixed on the upper end surface in the middle of the tooth frame, for A tooth lifting mechanism for driving the tooth frame to reciprocate up and down, a cloth feeding mechanism for driving the tooth frame to reciprocate back and forth, and a motor for driving the tooth lifting mechanism and the cloth feeding mechanism. At pre...

AI Technical Summary

Problems solved by technology

[0006] However, the above-mentioned structure has the following disadvantages: every time the cloth feeding table and the cloth feeding teeth of the sewing machine go back and forth along the horizontal direction, the output shaft of the cloth feeding motor needs to swing back and forth within a specified angle range, so the sewing machine must be reciprocated frequently. The rotation direction of the cloth feeding motor can be switched in a timely manner, so the load acting on the cloth feeding motor is relatively large; in addition, if the user changes the rotation speed of the sewing machine main shaft by operating the pedal, the cloth feeding motor cannot keep up with the rotation change of the main shaft, and the driving of the main shaft There will be deviations from the drive synchronization of the cloth feed motor, which will lead to poor quality of sewn products

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