Sewing machine presser foot lifting structure and sewing machine

Abstract

The invention provides a sewing machine presser foot lifting structure which comprises an automatic presser foot lifting driving source assembly, a top column, a knee leaning top rod, a rear lever assembly, a pull rod, a presser foot lifting mechanism and a presser foot assembly. The rear lever assembly comprises an automatic presser foot lifting lever and a knee leaning presser foot lever which can swing around the same fixed axis. A receding mechanism is arranged between the automatic presser foot lifting lever and the knee leaning presser foot lever. When the knee leaning presser foot lifting lever is driven by the knee leaning top rod to swing for knee leaning presser foot lifting, the receding mechanism makes the automatic presser foot lifting lever not swing; when the automatic presser foot lifting lever is driven by the automatic presser foot lifting driving source assembly for automatic presser foot lifting, the receding mechanism makes the knee leaning presser foot lifting lever synchronously swing along with the automatic presser foot lifting lever. The automatic presser foot lifting lever is made not to swing during knee leaning presser foot lifting by means of the receding mechanism, the top column does not swing, the top column cannot interfere with or collide with a sewing machine shell during knee leaning presser foot lifting, and therefore the lifting structurehas a sufficient knee leaning presser foot lifting height.

Description

technical field [0001] The invention relates to a sewing machine presser foot lifting structure. [0002] The present invention also relates to a sewing machine comprising the above sewing machine presser foot lifting structure. Background technique [0003] The sewing machine presser foot lifting structure in the prior art is as follows: figure 1 As shown, it includes a presser foot lifting electromagnet assembly 100, a top column 200, a knee lever 300, a rear lever 500 hinged to the casing through a screw 400, a pull rod 600, a presser foot lifting mechanism 700, and a presser foot lifting mechanism The presser foot assembly 800 at the lower end of 700, the presser foot lifting electromagnet assembly 100 is installed in the casing, one end of the top column 200 is in contact with the moving end of the presser foot lifting electromagnet assembly 100, and the other end is installed on one end of the rear lever 500, the knee The upper end of the push rod 300 is hinged to th...

AI Technical Summary

Problems solved by technology

However, due to the limitation of the internal structure of the needle feeding machine in the sewing machine, the sewing machine adopts a semi-external electromagnet structure. Therefore, if the height of the manual presser foot is too high, it will drive the stroke of the jack column 200 to move upward, and then the jack column 200 will move upward. The column 200 interferes and collides with the casing; in order to avoid the interference and collision between the top column 200 and the casing, the height of the presser foot can only be reduced when the presser foot is lifted manually, resulting in insufficient height of the knee-rest presser foot

The sewing industry standard requires the maximum height of the knee lifter to reach 13mm, but the maximum height of the knee lifter of the sewing machine with the above structure cannot reach 13mm at all.

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