Automatic adjusting mechanism for presser foot of sewing machine

By designing the automatic adjustment mechanism of the presser foot of the sewing machine, the lifting motor and swing drive mechanism are used to automatically adjust the presser foot height and swing amplitude, solving the problem of unsatisfactory results when sewing fabrics of different thicknesses and looseness, and improving the sewing effect and aesthetics of the stitching.

CN119686037APending Publication Date: 2025-03-25浙江川田智能科技有限公司
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Patent Information

Application Number
CN202311241052.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-09-24
Publication Date
2025-03-25

AI Technical Summary

Technical Problem

When sewing fabrics of different thicknesses and looseness, the existing sewing machine pressers cannot effectively adjust the height and swing amplitude, resulting in unsightly stitches and unsatisfactory sewing results.

Method used

An automatic adjustment mechanism for presser foot in sewing machine is designed, and the automatic adjustment of presser foot height and swing amplitude through the lifting motor and swing drive mechanism is achieved. The mechanism includes a rocker arm, a lifting arm, a lifting motor, a swing drive shaft and a swing drive motor. The height and swing amplitude of the presser foot are automatically adjusted according to the thickness and expansion of the fabric through the electronic control system.

Benefits of technology

The presser foot height adjustment for different thickness seams and the presser foot swing amplitude adjustment for multiple layers of different looseness seams are realized, making the stitches more in line with the fabric material, and the stitches produced by sewing are more beautiful, improving the sewing effect.

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Abstract

The invention relates to a sewing machine presser foot automatic adjusting mechanism which comprises a machine head shell, a machine needle rod and a presser foot rod are arranged on the machine head shell, the machine needle rod is connected with a driving main shaft through a crankshaft and a connecting rod, the upper portion of the presser foot rod is hinged to the output end of an adjusting lever, and a fulcrum in the middle of the adjusting lever is movably connected with a presser foot rod height adjusting mechanism. The presser foot rod height adjusting mechanism adjusts the height of the presser foot rod by changing the vertical position of a fulcrum in the middle of an adjusting lever, and the input end of the adjusting lever is movably connected with the swing driving mechanism. The swing driving mechanism is driven by the driving main shaft, the swing driving mechanism and the machine needle rod are driven by the driving main shaft, so that the machine needle rod and the presser foot rod are kept synchronous, the height of the presser foot can be adjusted, the swing amplitude of the presser foot can be adjusted, the height of the presser foot can be adjusted according to sewing materials with different thicknesses, and the sewing efficiency is improved. The swing amplitude of the presser foot can be adjusted according to multiple layers of sewing materials with different bulkiness, so that stitches are more matched with fabric materials, and the sewn stitches are more attractive.
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