Bar tacking machine with needle position safety detection sensor, control method and sensing plate thereof

Abstract

The invention discloses a method for controlling a bar tacking machine with a needle position safety detection sensor, which comprises the steps of firstly, detecting the actual position of a needle bar through a position sensor corresponding to a needle position induction sheet; secondly, judging the parking position through the edge detection method for a needle position signal, according to the corresponding relationship between the needle position induction sheet and the needle position signal; thirdly, judging the absolute position of the machine needle according to the needle position signal; fourthly, selecting the rotation direction of a motor according to the absolute position of the machine needle, and performing the needle lifting action for the first time after power on; fifthly, adopting the above needle feeding position as a mechanical phase zero and outputting the edge detection jump of the pulse signal and the needle position signal so as to realize the counting within 0-360 mechanical angles as phases. Due to the adoption of the method, the absolute physical position of a needle bar can be effectively detected, so that the safe operation direction of first needle lifting after power on is judged according to the position of the needle bar.

Description

technical field [0001] The invention relates to a sensor, in particular to a needle position safety detection sensor of a tacking machine. The invention also relates to a control method of a needle position safety detection sensor of a tacking machine, and a needle position sensing sheet of the needle position safety detection sensor. Background technique [0002] The needle position safety detection sensor of the existing tacking machine adopts the Hall sensor of two needle positions in its needle position sensing structure, or adopts the digital needle position based on the encoder and the relative zero point counting. [0003] Hall sensor using two pin positions such as figure 1 As shown, this needle position sensing structure requires two sensors, and the needle position sensing angle is generally less than 45 degrees, and it is impossible to perceive the absolute position where the needle deviates from the needle position; the corresponding relationship between the nee...

AI Technical Summary

Problems solved by technology

[0003] Hall sensor using two pin positions such as figure 1 As shown, this needle position sensing structure requires two sensors, and the needle position sensing angle is generally less than 45 degrees, and it is impossible to perceive the absolute position where the needle deviates from the needle position; the corresponding relationship between the needle position sensing structure and the signal is as follows figure 2 As shown, there is a blind area in the needle position sensing structure and signal, and the absolute mechanical position of the needle cannot be judged when the machine is turned on and powered on;

[0004] The other digital needle position based on encoder counting is realized by software counting method. The motor must first be rotated to find the zero point when the power is turned on, and the position of the upper and lower needle positions is detected by counting based on the zero point. When powering on, the motor must first rotate in a certain direction at a certain angle, which may cause unsafe hazards of breaking the needle

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