A mechanism for automatically adjusting the alternating amount of presser foot, an automatic presser foot lifting mechanism and a sewing machine

Abstract

The invention belongs to the technical field of sewing equipment, and particularly refers to an automatic adjustment mechanism for the alternating volume of the presser foot, an automatic presser foot lifting mechanism and a sewing machine; it includes a driving motor, which is a double-headed motor, and includes a first rotating shaft and a second rotating shaft; The rotating shaft is connected to the bracket shaft through the transmission part, and the bracket shaft is connected to the presser foot lifting bracket crank of the presser foot alternating volume adjustment mechanism; the second rotating shaft is fixed with a presser foot lifting cam for connecting the second rotating shaft and the presser lifting bracket. Foot mechanism; the first rotating shaft and the second rotating shaft rotate clockwise, drive the bracket shaft to move through the transmission part, and then cause the crank of the presser foot lifting bracket to undergo angular displacement, thereby changing the alternating amount of the presser foot, and the presser foot lifting cam rotates clockwise. The presser foot lifting mechanism executes an empty stroke; when the first rotating shaft and the second rotating shaft rotate counterclockwise, the presser foot lifting cam acts on the presser foot lifting mechanism to carry out the presser foot lifting action; The height of the feet is adjustable and the stability is good.

Description

Technical field: [0001] The invention belongs to the technical field of sewing equipment, in particular to an automatic adjustment mechanism for the alternating amount of a presser foot, an automatic presser foot lifting mechanism and a sewing machine. Background technique: [0002] The presser foot of the sewing machine presses the fabric tightly before sewing, and presses the fabric against the feed teeth during sewing, so that the teeth and the fabric have enough friction to transport the fabric and ensure normal sewing. When sewing multi-layer thick sewing materials, feeding by the cloth feed dog alone cannot meet the feeding requirements, and the cloth will slip and cannot be fed. Therefore, it is necessary to realize the feeding of the presser foot by alternating the size of the presser foot. When the presser foot is in contact with the cloth feed dog and feeds together, the small presser foot is lifted, and when the large presser foot is not in contact with the cloth ...

AI Technical Summary

Problems solved by technology

[0006] Due to the high pressure of the presser foot of the machine, the presser foot is lifted by the human knee, and the long working hours will cause fatigue and damage to the operator's knee; it is driven by electromagnets, and the entire transmission force is lost through the external transmission, the response is not timely, and only One-time lifting, not slightly lifting, long-term working electromagnet has poor durability and stability, which affects production efficiency

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