Bobbin thread remaining length calculation method and stopping control method for sewing machine

Abstract

The invention provides a bobbin thread remaining length calculation method for a sewing machine. The method includes steps: acquiring bobbin thread winding length A in winding of a thread on a bobbin;enabling a controller of the sewing machine to acquire bobbin thread initial length L of the bobbin thread on the bobbin, wherein the bobbin thread initial length L refers to the bobbin thread winding length A or bobbin thread remaining length after finishing of last sewing; starting stitching; after sewing is finished, enabling the controller of the sewing machine to acquire a stitch number M and a bobbin thread utilization length B in each stitch pitch, and enabling the controller of the sewing machine to automatically calculate the bobbin thread remaining length Y, wherein Y=f(L, M, B), and f(L, M, B) is pre-stored in the controller of the sewing machine. By adoption of the method, the remaining length Y of the bobbin thread on the bobbin can be calculated effectively, and accordinglythe bobbin thread remaining length can be effectively monitored; especially, bobbin structural modification is avoided, the method can be implemented by adoption of a normal bobbin, exclusiveness of the bobbin is avoided, universality of the bobbin is realized, and processing difficulty of the bobbin is lowered.

Description

technical field [0001] The invention relates to the field of sewing machines, in particular to a method for calculating the remaining amount of the bottom thread of the sewing machine and a method for controlling the stopping of the sewing machine. Background technique [0002] When the sewing machine is sewing the sewing material, 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 sewing material 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 the sewing process, so the upper thread can be replaced in time. Howeve...

AI Technical Summary

Problems solved by technology

However, due to the limitation of sewing machine space and mechanism principle, the bottom thread is generally short, only 20m-50m, so the bobbin needs to be replaced frequently

[0003] At present, for sewing machines without the detection function of the bobbin thread margin, workers cannot directly see whether the bobbin thread margin on the bobbin is sufficient, so they cannot find out in time after the bobbin thread is used up, resulting in invalid sewing, resulting in scrapping of sewing materials or removal of stitches rework

For sewing machines with the detection function of the bottom thread margin, most of them realize the detection of the bottom thread margin through sensors. The bobbin, the bobbin has the function of reflecting the sensor signal, so the bobbin is a special bobbin, which cannot be used in common with the commonly used bobbin in the market, and this special bobbin is not only poor in versatility, but also difficult to process

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