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Electromagnetically needle selecting method of computerized flat knitting machine based on Q15 fixed-point algorithm

A fixed-point algorithm, computerized flat knitting technology, applied in flat knitting, knitting, weft knitting and other directions with separate action needles, which can solve the problems of inconvenient production and management, increased rack and copper head costs, and high prices. Fast processing, manufacturing cost savings, improved speed and precision

Inactive Publication Date: 2010-02-24
HANGZHOU COMFIRMWARE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is relatively reliable and theoretically simple, and can increase the speed of the loom and avoid errors caused by the long-term transmission of the belt. However, the needle readers (copper heads, copper heads for reading needles) are mainly produced by a few companies such as Japan and Germany, and are expensive. Increase the cost of racks and copper heads, and the corresponding racks of flat knitting machines with different gauges are also different, which also brings a lot of inconvenience to production and management

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • Electromagnetically needle selecting method of computerized flat knitting machine based on Q15 fixed-point algorithm
  • Electromagnetically needle selecting method of computerized flat knitting machine based on Q15 fixed-point algorithm
  • Electromagnetically needle selecting method of computerized flat knitting machine based on Q15 fixed-point algorithm

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Experimental program
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Effect test

Embodiment 1

[0029] The present invention is d needles for weft knitting mode, width is 1 inch domestic flat knitting machine control system adopts fixed-point algorithm to realize needle selection and makes following analysis:

[0030] The so-called d needles mean that there are d needles within one inch of the needle bed, that is, the needle distance d; the width of the flat knitting machine refers to the maximum width l of knitting on the flat knitting machine. This project uses the built-in encoder of the servo motor to read the needle. It is assumed that the number of pulses required to drive the servo motor to move a width on the needle plate is pulse; the total number of needles is total_pins.

[0031] The total number of machine needles = machine length (inch) * needle pitch, thus,

[0032] Total number of machine needles: total_pins=l*d

[0033] The corresponding pulse number of each pin is: pin_plse=pulse / total_pins

[0034] Assuming that the current value of the pulse number r...

Embodiment 2

[0064] Explain the specific application of Q15 fixed-point algorithm in the control system of 12-needle weft-knitting flat knitting machine with a width of 52 inches.

[0065] Total number of machine needles: total_pins=l*d=52*12=624;

[0066] The number of pulses that need to be sent to drive the servo motor to move on the needle plate for one cycle is pulse=26416

[0067] The corresponding pulse number of each pin is: pin_pulse=pulse / total_pins=26416 / 624=42.33;

[0068] For any position of the machine head running, the pulse amount of the corresponding encoder is current_pulse,

[0069] Suppose current_pulse=1000,

[0070] current_pin=current_pulse*(l / pin_pulse)=1000*(l / pin_pulse)

[0071] let l / pin_pulse = pp;

[0072] pp=l / pin_pulse=1 / 42.33=0.0236

[0073] According to the above analysis, it can be seen that Qx=0, Qy=15, and Qz=0 in combination with (4), therefore, x=1000, y=0.0236*32767=773, that is, the y floating-point value is processed by Q15.

[0074] temp=1000...

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Abstract

The invention belongs to the technical field of automatic knitting machines, in particular to an electromagnetically needle selecting method of a computerized flat knitting machine based on a Q15 fixed-point algorithm. The method is characterized by comprising the following steps: (1) reading needle selecting information; (2) storing information of needle pressing states of blades on a needle selector; (3) reading selected needles in a nose direction; (4) utilizing a coder to feed back pulse signals and adopting the Q15 fixed-point algorithm to carry out real-time data processing so as to determine positions of the blades of the needle selector; (5) calculating state values of the blades of the needle selector, i.e. determining the state values of the positions of the blades of the needleselector by judging a state value of the machine head direction, i.e. controlling 0.1 values of the blades; (6) comparing the states of the blades; (7) driving the blades with different state values to act; and (8) judging whether a needle selecting process is ended or not. On one hand, the needle selecting method improves the speed and the precision of needle selection, and on the other hand, solves the problem of reliability of the needle selection, thereby not only saving manufacturing cost, but also effectively overcoming technical contradiction of the speed and the reliability of the needle selection.

Description

technical field [0001] The invention belongs to the technical field of automatic knitting machines, in particular to an electromagnetic needle selection method for computerized flat knitting machines based on a Q15 fixed-point algorithm. Background technique [0002] The control of the needle selection mechanism of the computerized flat knitting machine is the key to whether the whole flat knitting machine can work normally. It can select every needle on the flat knitting machine, so it has many advantages. In the electromagnetic needle selection system, electromagnetic needle selection is the last step after all the needle selection information is calculated, so the accuracy of needle reading and the real-time performance of needle selection information processing will affect the accuracy and reliability of needle selection control. [0003] Foreign counterparts basically adopt the rack copper head needle reading method, that is, install a rack on the needle bed, one tooth ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04B15/00D04B7/00
Inventor 任天挺林志坚陈旭东
Owner HANGZHOU COMFIRMWARE TECH CO LTD
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