Base line allowance detection device for lock stitch sewing machine and detection method thereof

Abstract

The invention relates to a base line allowance detection device for a lock stitch sewing machine and a detection method thereof. The base line allowance detection device for the lock stitch sewing machine comprises a base line quantity detection part, a facial line use quantity detection part and a controller. The base line quantity detection part comprises a base line counting disc, a cop latch winder, a base line sensor for sensing the turning number of turns of the base line counting disc and a winding sensor for sensing the starting and stopping of the cop latch winder. The facial line use quantity detection part comprises a facial line counting disc and a facial line sensor for sensing the turning number of turns of the facial line counting disc. The controller is provided with a control module which controls the cop latch winder and the lock stitch sewing machine to work and receives and processes signals of the base line sensor, the winding sensor and the facial line sensor. According to fact that the base line winding quantity minus the facial line use quantity is the base line allowance, base line allowance detection is achieved. The base line allowance detection device is simple in structure, convenient to operate and use and high in intelligence degree and has accuracy in detection.

Description

technical field [0001] The invention relates to a detection device for the bottom thread of a sewing machine, in particular to a detection device and a detection method for the bottom thread surplus of a lock stitch sewing machine. Background technique [0002] The upper thread of a lock stitch sewing machine is generally very long, ranging from 3000m to 4000m, and the amount of thread can be observed at any time. Due to the limitation of space and mechanism principle, the bottom line is generally short, only 20m ~ 50m, and it is not easy to observe. Since the amount of bobbin thread cannot be increased during sewing operation, the bobbin needs to be replaced frequently, but it is difficult to determine how to know the amount of thread used by the bobbin and when to replace the bobbin. In the event of an out-of-line operation, defective products will be produced. The traditional bobbin thread detection method mainly judges the amount of bobbin thread used according to the ...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the above disadvantages, the purpose of the present invention is to provide the field with a lockstitch sewing machine bobbin thread margin detection device and its detection method, so that it can solve the problems of complex structure, low bobbin thread detection accuracy and manufacturing cost of existing similar products. big technical problem

Images