Novel sewing machine lifting pressing foot front lever loose thread nail structure and assembling method thereof

Abstract

The invention discloses a novel sewing machine lifting pressing foot front lever loose thread nail structure. The structure comprises the machine head and the engine base of a sewing machine. A leversheet is arranged at a front stitch pressing foot rod in the machine head. The rear end of the lever sheet is hinged to a pull rod. The lever sheet is provided with a loose thread groove and an internal portion is cooperatively provided with a loose thread nail and a loose thread nail back taper which is contacted with the outer contour of the loose thread groove. The loose thread nail and the loose thread nail back taper are split-type structures. The loose thread nail back taper is provided with a locking hole. A locking bolt is cooperated in the locking hole. On the two side walls of the machine head, side wall holes are cooperatively provided with the loose thread nail. Simultaneously, an assembling method is disclosed. By using the novel sewing machine lifting pressing foot front lever loose thread nail structure and the assembling method, production can be conveniently and rapidly performed and efficiency is high; and the split-type structure is adopted, local fine tuning is convenient, assembling is convenient and operation is easy.

Description

technical field [0001] The invention belongs to the field of sewing machine manufacturing, and specifically relates to a new type of structure of a thread-releasing nail with a lever before lifting the presser foot of a sewing machine and an assembly method thereof. Background technique [0002] A sewing machine is a machine that uses one or more sewing threads to form one or more stitches on the sewing material to interweave or sew one or more layers of sewing material. A general sewing machine consists of four parts: machine head, machine base, transmission and accessories. [0003] During the use of the sewing machine, it is necessary to lift the presser foot to change the fabric or shift; in order to avoid the sewing thread being pulled and broken during the process of lifting the presser foot, it is usually used to release the thread release device at the same time during the process of lifting the presser foot. The structure of the thread loosening nail of the lever b...

AI Technical Summary

Problems solved by technology

The above operations are performed in the narrow space inside the sewing machine head 80. Adjustment is performed through the front mounting hole 801 at the front end of the sewing machine head 80 and the bottom gap of the machine base 81. The nail 60 and the thread-loosing inverted cone 61 are fixed as a whole. Due to processing errors, the installation positions vary greatly, and careful adjustments cannot be made.

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