Sewing machine bottom line counting detection device and method and sewing machine

Abstract

The invention relates to a sewing machine bottom line counting detection device, a method which uses the counting detection device for counting detection on bottom lines of a sewing and the sewing machine which comprises the counting detection device. The counting detection device comprises an NFC tag, an NFC reader and a controller; the NFC tag is pasted on one side, close to the outer circumference, of the surface of a rotation shuttle core of the sewing machine; the NFC reader is arranged in the position, which is suitable for sensing the NFC tag, in the sewing machine; the controller is connected with the NFC reader and used for receiving information read by the NFC reader and counting, and the counting number of turns of the rotation shuttle is obtained. According to the counting detection device, the counting accuracy of the number of the bottom lines of the shuttle core can be improved.

Description

technical field [0001] The invention relates to the technical field of sewing machines, in particular to a sewing machine bobbin thread counting detection device and method and a sewing machine with the bobbin thread counting detection device. 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 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, up to 3000m-4000m, and th...

AI Technical Summary

Problems solved by technology

However, due to the limitations of sewing machine space and mechanism principles, the bottom thread is generally short, often only 20m-50m, so the bottom thread needs to be replaced frequently during the sewing process

[0003] Existing detection methods for the amount of bobbin thread on sewing machines can be roughly divided into photoelectric reflection type, mechanical and physical contact type, etc., but these detection methods have certain disadvantages, such as the low accuracy of the bobbin recognition rate, and the amount of remaining bobbin thread cannot be accurately controlled. , oil stains and lint have a great influence on the sensor, so it cannot meet the needs of various working conditions to a certain extent

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