Automatic presser lifting foot of sewing machine and device to adjust the pressure of presser foot automatically

Abstract

The invention discloses an automatic presser lifting foot of sewing machine and a device to adjust the pressure of presser food automatically, including a motor, which can drive through a pedal and a controller. An output shaft of the motor is connected fixedly with a driven gear. The driven gear is connected with one end of a straining beam through a pin. Another end of the straining beam is connected with the attachment end of a setsquare. The swing end of the setsquare is connected fixedly with a slider through a screw pin. The slider is installed inside the groove of the slider. A crank is connected fixedly with the cover of the foot presser. A presser bar is installed inside the cover of the foot presser. The presser bar is provided with a spring. The presser bar is connected with the cover of the foot presser through the spring. The bottom of the presser bar is connected fixedly on the presser foot. One side of the presser food is installed with a displacement transducer. The displacement transducer is installed fixedly on the shell of the sewing machine. The displacement transducer is connected with the controller of the motor through a wire or without a wire. The device to adjust the pressure of the presser foot automatically can adjust the pressure of the presser foot automatically in accordance with thickness of material, lessen the requirements of operating skills and improve the working efficiency.

Description

technical field [0001] The invention relates to an accessory of a sewing machine, in particular to a device for automatically lifting the presser foot and automatically adjusting the pressure of the presser foot of the sewing machine. Background technique [0002] The lifting and lowering mechanism of the presser foot of the existing sewing machine is driven manually, by electromagnets or cylinders. The disadvantages are that the labor intensity is high, the noise is large, and the stroke cannot be controlled. [0003] In addition, in this presser foot lifting and lowering mechanism, the pressure of the presser foot is generally manually adjusted through a nut, and cannot be automatically adjusted. Contents of the invention [0004] The technical problem to be solved by the present invention is to provide an automatic presser foot lifter and an automatic presser foot pressure adjustment device for a sewing machine, which can realize the automatic presser foot lifter functi...

AI Technical Summary

Problems solved by technology

[0002] The lifting and lowering mechanism of the presser foot of the existing sewing machine is driven manually, by electromagnets or cylinders. The disadvantages are that the labor intensity is high, the noise is large, and the stroke cannot be controlled.

[0003] In addition, in this presser foot lifting and lowering mechanism, the pressure of the presser foot is generally adjusted manually through a nut, and cannot be adjusted automatically

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