Precise positioning system of industrial sewing machine and working method of precise positioning system

Abstract

The invention discloses a precise positioning system of an industrial sewing machine and a working method of the precise positioning system and relates to a positioning system of a sewing machine and a working method of the positioning system. The general phenomena of low stop precision, reversal, shaking, poor stability and the like are caused by a reason that the conventional industrial normal sewing machine positioning method generally adopts an adjustment system with a closed-loop position. The precise positioning system is characterized in that a controller comprises a quick reverse-dragging braking module, a speed adjustment module, a torque feedforward module and a three-phase short-circuit controllable stopping module. According to the technical scheme provided by the invention, the quick reverse-dragging braking module is adopted to enable a servo motor to be deaccelerated quickly, and the speed adjustment module is used for stabilizing the speed within a range; when the sewing machine starts to be positioned near to a trimming point, the sudden load change is maximum, and the torque feedforward module supplies a forward dragging torque in advance to counteract the sudden load change during trimming; when a head of the sewing machine is positioned near to a needle stopping point, the three-phase short-circuit controllable stopping module brakes a three-phase short circuit, so that the problems of inaccurate needle stopping and needle stopping shake, which are caused by reverse-dragging braking, can be solved.

Description

technical field [0001] The invention relates to a sewing machine positioning system and its working method. Background technique [0002] The traditional positioning method of industrial lockstitch sewing machine generally adopts a position closed-loop adjustment system. The needle stop of the sewing machine adopts the method of reverse connection braking, the current is large, the reaction force is large, and it is prone to vibration and inaccurate parking. In addition, because the load of the lockstitch machine is large when it is parked and positioned, the parking accuracy is generally not high, and There are phenomena such as reversal, jitter, and poor stability. Contents of the invention [0003] The technical problem to be solved and the technical task proposed by the present invention are to perfect and improve the existing technical solutions, provide an industrial sewing machine precise positioning system and its working method, so as to achieve the purpose of ac...

AI Technical Summary

Problems solved by technology

The needle stop of the sewing machine adopts the method of reverse connection braking. The current is large and the reaction force is large, which is prone to vibration and inaccurate parking. In addition, due to the large sudden change of load when the lockstitch machine is parked and positioned, it is common that the parking accuracy is not high, and There are phenomena such as reversal, jitter, and poor stability

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