Sewing machine feeding mechanism and sewing machine

Abstract

The invention provides a sewing machine feeding mechanism. The sewing machine feeding mechanism comprises a main motor, a cloth feeding motor, a feed dog rack and a feed dog; the main motor is connected to the feed dog rack through a feed lifting mechanism; and the cloth feeding motor is connected to the feed dog rack through a cloth feeding mechanism. The cloth feeding mechanism comprises a feeding shaft, a drive connecting rod, a swing connecting rod, a first connecting rod, a second connecting rod, a third connecting rod and a feed dog rack seat; one end of the drive connecting rod is fixedly connected to an output shaft of the cloth feeding motor; the other end of the drive connecting rod is hinged to one end of the second connecting rod; the other end of the second connecting rod is hinged to one end of the first connecting rod and one end of the third connecting rod; the other end of the first connecting rod can swing around a fixed support; the other end of the third connecting rod is hinged to one end of the swing connecting rod; the other end of the swing connecting rod and the feed dog rack seat are fixed to the feeding shaft; and the feed dog rack seat is hinged to the feed dog rack. According to the invention, the switching frequency of the rotating direction of the output shaft of the cloth feeding motor can be greatly reduced, the synchronization of the driving of the main motor and the driving of the cloth feeding motor is guaranteed, 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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