Method and device for detecting bobbin threads of sewing machine

Abstract

The invention relates to the technical field of sewing, in particular to a method and a device for detecting bobbin threads of a sewing machine. The technical scheme includes that the device comprises a bobbin, a push plate, a cushion block, a photoelectric sensor, a clamping plate and a spindle controller, the photoelectric sensor is arranged between the cushion block and the clamping plate, the cushion block is arranged on the push plate, and the bobbin is arranged on a bobbin case, on one side of the photoelectric sensor, of the sewing machine. One lateral surface of the bobbin is alternately provided with a plurality of high light areas and low light areas, the other lateral surface of the bobbin is provided with magnetic steel, a transmitting end and a receiving end of the photoelectric sensor face the bobbin on the bobbin case and are connected to the spindle controller, and whether the bobbin threads are used up or not is detected according to a certain detection method. The method and the device for detecting the bobbin threads of the sewing machine have the advantages that using up and breaking of the bobbin threads and withdrawal of a needle without threads can be detected out timely and accurately, an operator can be timely reminded of bobbin replacement or machine maintenance for clearing abnormity, and formation of idle stitches only with needle threads but without the bobbin threads is avoided.

Description

technical field [0001] The invention relates to the field of sewing technology, in particular to a sewing machine bobbin thread detection device and a detection method thereof. Background technique [0002] At present, a large number of lock stitch sewing machines are used in the garment manufacturing industry. It is a sewing device that cooperates with a rotary hook and a machine needle to make the bottom thread and upper thread interlock in the sewing material to realize lock stitch. The upper thread is on the upper surface of the sewing material, visible to the operator, and the upper thread is longer, generally up to several kilometers, and the replacement frequency is relatively low. When the upper thread is broken or exhausted, the operator can promptly Find. The bobbin thread is not the case. It is located in the rotary hook under the sewing material, invisible to the operator, and the bobbin holding the bobbin thread has a small thread capacity, only tens of meters,...

AI Technical Summary

Problems solved by technology

But the bobbin thread is not the case. It is located in the rotary hook under the sewing material, and the operator cannot see it. The bobbin holding the bobbin thread has a small thread capacity, only tens of meters, and the replacement frequency is very high.

In the event of emergencies such as exhaustion of the bottom thread, broken bottom thread, unhooked bottom thread when the needle is raised, if the operator cannot find out in time, a section of empty stitches with only upper thread but no bottom thread will be formed on the sewing material, which will affect production Efficiency affects product quality, and at the same time causes waste of upper thread

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