Buttonholing bottom thread consumption calculation method and bobbin residual thread amount control method

Abstract

The invention relates to a buttonholing bottom thread consumption calculation method and a bobbin residual thread amount control method. According to the buttonholing bottom thread consumption calculation method, firstly the reference bottom thread amount M and the unit bottom thread increase amount B of different buttonholing shapes are determined in a measurement mode, and then the desired buttonholing bottom thread consumption can be quickly and accurately calculated according to the buttonholing shapes to be sewed, the buttonholing sizes and the buttonholing sewing form requirements, so that calculation is convenient and the application range is wide. According to the bobbin residual thread amount control method, the buttonholing bottom thread consumption calculated by the buttonholingbottom thread consumption calculation method is used for monitoring and judging the bobbin residual thread amount in a sewing process, and when the bobbin residual thread amount is the warned bottomthread amount, early warning and down counting are started, a buttonholing machine is timely stopped, and the bobbin residual thread amount of the buttonholing machine in the sewing process is reasonably and efficiently controlled, so that the final residual amount of bottom threads on a bobbin is controlled to be minimal to the maximum extent while the empty needle running phenomenon is avoided.

Description

technical field [0001] The invention relates to the field of buttonhole machines, in particular to a method for calculating buttonhole bottom thread consumption and a method for controlling the amount of bobbin remaining thread. Background technique [0002] When the buttonhole machine is working, due to the installation position of the rotary hook and the structure of related parts, it is difficult to observe the remaining thread amount of the bottom thread on the bobbin. When the bobbin thread is exhausted, if the operator fails to replace the bobbin that has run out of the bobbin thread in time, there will be an empty needle phenomenon, resulting in frequent rework of sewn products and waste of high-grade fabrics. Therefore, it is necessary to leave an appropriate value for the remaining thread amount of the bobbin at the end of sewing, and this value should meet the design requirements, while the remaining thread amount of the bobbin for the buttonhole machine will be de...

AI Technical Summary

Problems solved by technology

[0002] When the buttonhole machine is working, due to the installation position of the rotary hook and the structure of related parts, it is difficult to observe the remaining thread amount of the bottom thread on the bobbin

When the bobbin thread is exhausted, if the operator does not replace the bobbin that has run out of bobbin thread in time, there will be empty needles, resulting in frequent rework of sewing products and waste of high-grade fabrics

Therefore, it is necessary to leave an appropriate value for the remaining thread amount of the bobbin at the end of sewing, and this value should meet the design requirements, while the amount of remaining thread for the bobbin of the buttonhole machine will be determined according to the consumption of the bottom thread of the buttonhole (required for sewing a buttonhole) The bobbin thread length) is different, and it is difficult to control the remaining thread amount of the bobbin in actual work.

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