System and method for controlling variable density of fully automatic computerized flat knitting machine

Abstract

The invention discloses a system for controlling a variable density of a fully automatic computerized flat knitting machine. The system comprises HCI (Human-Computer Interaction), an upper-layer communication module, a processing module, an interface module and multiple brushless DC (Direct Current) motors, wherein the brushless DC motors are connected to a density triangle through a drive mechanism. A method for controlling the variable density of the fully automatic computerized flat knitting machine comprises the steps of: firstly obtaining a position where the density triangle is going to arrive; finishing the setting of processing data through the upper-layer communication module; calculating and setting a variable value of a position of the density triangle and rotation turns as well as coding variable value of the brushless DC motor corresponding to the variable value; then transmitting a command to the processing module; outputting a PWM (Pulse-Width Modulation) signal by the processing module and converting the PWM signal into a UVW three-phase signal through the interface module; controlling the rotation of the brushless DC motors through the UVW three-phase signal; feeding coded signals back to the processing module by a motor coder while the brushless DC motors rotate; when a coded signal variable value received by the processing module reaches to a set value, stopping sending the PWM signal; and locking the motor. Therefore, the position of the density triangle is changed, and the purpose of changing the fabric count is realized.

Description

technical field [0001] The invention relates to the technical field of fully automatic computerized flat knitting machines, in particular to a variable density control system and method for fully automatic computerized flat knitting machines. Background technique [0002] Stitch control is an important control in the control system of fully automatic computerized flat knitting machines. Taking the 3-needle machine series fully automatic computerized flat knitting machine as an example, it has 4 stitch control motors. The traditional stitch control uses stepping motors Control, the stepper motor is connected to the density triangle through the transmission mechanism. The transmission mechanism is: the output shaft of the stepper motor is fixedly equipped with a gear, the gear meshes with the gear row, and the gear row is connected to the density triangle through the bearing. Usually, the knitting stitches in each row are the same. , the density cannot be changed within a row ...

AI Technical Summary

Problems solved by technology

[0002] Stitch control is an important control in the control system of fully automatic computerized flat knitting machines. Taking the 3-needle machine series fully automatic computerized flat knitting machine as an example, it has 4 stitch control motors. The traditional stitch control uses stepping motors Control, the stepper motor is connected to the density triangle through the transmission mechanism. The transmission mechanism is: the output shaft of the stepper motor is fixedly equipped with a gear, the gear meshes with the gear row, and the gear row is connected to the density triangle through the bearing. Usually, the knitting stitches in each row are the same. , the density cannot be changed within a row of weaves

[0003] In the same transmission structure, the stepper motor has low speed, small rotational torque, and is easy to lose steps and has poor precision. Therefore, the density can be adjusted during the movement, and the stepper motor cannot realize variable knitting stitches in one knitting row.

At present, foreign countries also have variable-degree purpose schemes, but the cost is high, and it is impossible to adjust the density between adjacent needles.

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