Cloth-cutting apparatus of sewing machine

Abstract

A lint guide part 5 is provided in a clearance between a moving knife 30 and an opening part 40a. The end face of the lint guide part 5 opposed to the opening part 40a is formed into the same shape to that of the opening part 40a to efficiently exert a suction force. The lint guide part 5 is connected to the moving knife 30 and vertically move integrated therewith, and the opening part 40a and the end face of the lint guide part 5 are disposed on the same height at the lowermost end position to improve the lint collecting efficiency. To provide a cloth cutting knife device of a sewing machine causing neither malfunction due to the intrusion of lint produced when cutting a cloth by the cloth cutting knife device nor seizure of the sewing machine due to the lint absorbing oil.

Description

technical field [0001] The invention relates to a cloth cutting device of a sewing machine. Background technique [0002] Conventionally, there is known a cloth cutting device on a sewing machine in which a movable knife can be raised and lowered above a needle plate by swinging and rotating a movable knife shaft supporting the movable knife, and the cloth can be cut together with a fixed knife. [0003] The cloth cutting device is composed of a fixed knife mounting seat provided on the needle plate and fixed on the knife mounting seat, and is driven by a movable knife driving mechanism to swing and rotate. The blade part of the movable cutter slides in contact with each other, and cuts the cloth conveyed by the cloth feeding mechanism sequentially. [0004] At this time, at the position where the above-mentioned fixed knife and the movable knife cut the cloth, cloth waste is generated along with the cloth cutting. In order to prevent this cloth waste from accumulating ins...

AI Technical Summary

Problems solved by technology

[0007] However, in the techniques described in Patent Document 1 and Patent Document 2, even though most of the accumulated cloth waste can be discharged, the problem of fine cloth waste entering the interior of the device from the gap portion of the device cannot be eliminated.

Therefore, the cloth dust that entered the inside of the device caused mechanical failure, and forced oiling of the operating shaft and the like also caused cloth dust to enter between the operating shaft and the bushing, causing very serious problems such as device sintering.

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