Bottom thread balance detection mechanism of sewing machine

Abstract

The invention provides a bottom thread balance detection mechanism of a sewing machine, and belongs to the technical field of sewing equipment. The technical problem in an existing sewing machine thaterrors easily occur during bottom thread balance detection is solved. The sewing machine comprises a baseboard and a rotating shuttle, the rotating shuttle is internally provided with a shuttle core,a bottom thread balance detection mechanism comprises a photoelectric sensor fixedly arranged on the baseboard, and the photoelectric sensor faces the rotating shuttle; an opening which is communicated with the shuttle core is formed in the portion, right facing the side face of the photoelectric sensor, of the rotating shuttle the bottom thread balance detection mechanism further comprises a gasflow generation device, and gas flow generated by the gas flow generation device can flow to the portion between the photoelectric sensor and the rotating shuttle. The gas flow generation device additionally arranged in the bottom thread balance detection mechanism is simple in structure, low in manufacturing cost and convenient to install, what is only needed is to install the gas flow generation device on a lower shaft of the existing sewing machine, an extra driving source or gas source does not need to be arranged, the universality is high, and the bottom thread balance detection mechanism is applicable to most lockstitch sewing machines; meanwhile, the effect on cleaning away lint is good.

Description

technical field [0001] The invention belongs to the technical field of sewing machine equipment, and relates to a bobbin thread margin detection mechanism of a 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 bottom thread is wound on the bobbin. The upper thread is generally longer, 3000m-4000m, and the user can observe the amount of upper thread at any time during t...

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. induction, causing its induction to fail

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