A thread hair cleaning device at the detection point of the bottom thread margin of a sewing machine

Abstract

The invention provides a lint removal device at a bottom thread allowance detection position of a sewing machine, and belongs to the technical field of sewing equipment. The device solves the technical problems that bottom thread allowance detection of an existing sewing machine is prone to mistakes and the like. The sewing machine comprises a thread shearing knife rest, a bottom plate and a rotating shuttle. A photoelectric sensor facing the rotating shuttle is fixedly arranged on the bottom plate. The lint removal device comprises a cleaning part, and the cleaning part is arranged on the outer side of the rotating shuttle and is located between the photoelectric sensor and the rotating shuttle; the cleaning part is fixedly connected to the thread shearing knife rest and can rotate aroundthe rotating shuttle under the driving of the thread shearing knife rest, and the cleaning part is provided with a light passing space which enables light rays of the photoelectric sensor to pass through the rotating shuttle. According to the lint removal device, lint is removed regularly through the cleaning part, so that the situation that the light rays of the photoelectric sensor are accumulated by the lint at the channel position and accordingly the detection accuracy and reliability are influenced is effectively prevented.

Description

technical field [0001] The invention belongs to the technical field of sewing machine equipment, and relates to a detection mechanism for the remaining amount of the bottom thread of a sewing machine, in particular to a lint cleaning device at the detecting position of the remaining amount of the bottom thread of the sewing machine. Background technique [0002] A sewing machine is a machine that uses one or more sewing threads to form one or more stitches on the fabric to interweave or sew one or more layers of fabric. When the sewing machine is sewing the fabric, the rotary hook and the machine needle of the sewing machine cooperate with each other to interweave the bottom thread and the upper thread and sew them on the fabric to form stitches. The upper thread is passed through the needle eye of the machine needle, and the machine needle moves up and down; the rotary hook is composed of a bobbin case and a bobbin, the bobbin is accommodated in the bobbin case, and the bot...

AI Technical Summary

Problems solved by technology

[0004] In the above patent documents, the photoelectric sensor and the reflective element on the bobbin are used to detect whether the bottom thread of the bobbin is used up, and the phenomenon of detection failure will also be caused by excessive accumulation of thread wool and affecting the light beam of the photoelectric sensor.

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