Method for detecting residual amount of bottom threads

Abstract

The invention discloses a method for detecting the residual amount of bottom threads. The method includes the following steps of a, setting the stitch length A of a needle, detecting signals through abottom thread detecting sensor, sending the bottom thread residual amount B during electronic control, and calculating the number (P=B / A) of threads capable of being sewn according to the residual amount B; b, recording the number C of threads sewn within a set region and the number E of sewing units D, and calculating the number (Q=C / E) of threads required by one sewing unit D; c, judging whether the sewing of one sewing unit D can be completed according to the residual amount B or not, if not, giving an alarm, and otherwise, giving no alarm. The residual bottom threads can be prejudged in advance, the reworking or stitch removing caused when workers are reminded of the lack of bottom threads in the middle of sewing is avoided, and the aim of bottom thread detecting original purpose is realized.

Description

Technical field [0001] The invention belongs to the technical field of sewing, and particularly relates to a method for detecting the remaining amount of a bottom thread. 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 rotating shuttle and the needle of the sewing machine cooperate with each other to interlace and sew the bottom thread and the upper thread on the fabric to form stitches. The upper thread is threaded through the eye of the needle, and the needle moves up and down; the rotary hook is composed of a bobbin case and a bobbin core. The bobbin core is housed in the bobbin case and the bottom thread is wound around the bobbin core. The upper thread is generally longer, 3000m-4000m, and the user can observe the amount of the upper thread at any time during the sewing process, so th...

AI Technical Summary

Problems solved by technology

[0004] The detection method of the bobbin thread remaining can realize the detection of the bobbin thread remaining, and then when the sewing machine is sewing the product, the alarm prompts that the bobbin thread is gone, the user can only replace the bobbin connection for mechanical sewing, or remove the previously sewn thread. It cannot achieve the original intention of bottom line detection

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