JPH0350008B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for inspecting the winding shape of a wound package produced by a winding machine.

Prior Art In textile machines, such as automatic winders that rewind spinning tube yarn to produce packages of a predetermined size and shape, the wound packages often include packages with poor winding shapes due to various reasons. There is. For example, as a typical example, as shown in Fig. 8 A, B, and C, the yarn end _Y1 falls from the yarn layer end surface F and winds around the winding tube K or enters the yarn layer. , a step-wound package P2 in which a step T is formed in the yarn layer due to tension fluctuation, or a package P3 in which the end surface surface is uneven, called chrysanthemum winding G, which is caused by inappropriate tension, contact pressure, eccentricity of the winding tube, etc. There are various types of packages with poor winding shapes. If such a poorly wound package is used as it is in a knitting machine or loom, it will not unravel smoothly and may cause yarn breakage. The winding shape is inspected visually by the operator.

Problems to be Solved by the Invention The above inspection method may miss minute defective parts, and may also miss checking for winding defects depending on the viewing angle. This has become a major problem in systems that automatically transport packaging and shipping.

The present invention solves the above problems and provides a method for accurately inspecting packages with poor winding shapes.

Means for Solving the Problems The present invention images the reflected light of the light irradiated on the radius or diameter line of the end face of the package using an image sensor, and compares and processes the photoelectrically converted level signal and the reference level signal. While the package is being rotated about its axis, a winding defect appearing on the end face of the package is inspected based on optical information captured by the image sensor.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In FIG. 1, the inspection device includes a light source 3 that irradiates light onto the yarn layer surface 2 of the package 1 to be inspected;
It is composed of a light projecting section 5 such as a lens 4, a lens 6 that receives the reflected light, a light receiving section 8 such as an image sensor 7, and an analysis device 9 that analyzes the information received. The optical signal obtained by the image sensor 7 is converted into an electrical signal, passed through a noise remover 10, and converted into a signal of a size suitable for processing by an amplifier 11,
Furthermore, it is converted into a digital signal via an analog-to-digital converter 12. The signal is processed by a normalization circuit 13 to make it suitable for comparison with a set level.
In some cases, the data may be input into the memory 14 and put on standby temporarily. The normalized signal is input to the level comparator 15, and is compared with a pre-input set level by the arithmetic unit 16. As a result of the comparison, an output signal indicating a defective package or a normal package is output.
If it is a defective package signal, it is output as a signal to turn on a red lamp, for example, or to drive a transport sorting device to another transport path.

For example, the inspection method will be described assuming that the end surface 1a of the package 1 to be inspected is a defective package in the form of a stepped winding having an annular recess 17 as shown in FIG. As shown in FIG. 1, when the image sensor 7 captures an image of the reflected light X2 of the light X1 irradiated on the end face of the package, the reflected light X2 of the radius d portion of the package 1
When receiving the photoelectrically converted electric signal L1
becomes the line L1 in FIG. 2, and the signal L2 from which the noise has been further removed becomes the line L2 in FIG. Here, the high level part 18 corresponds to the flat part 1a of the package end face, and the low level part 19 corresponds to the package 1 in FIG.
This corresponds to the recess 17 of. Note that the other small low level portion 20 of the signal L2 does not appear on the package surface, or even if it does appear, it is a minute recess, and is a low level portion caused by some kind of disturbance. Further, the signal L2 is transmitted to an amplifier 11,
It is input to the normalization circuit 13 via the A/D converter 12, and is suitable for comparing the signal level strength.
1 signal L3. The normalized signal level L3 is compared with the preset reference level V, and if there is a signal portion 21 exceeding the reference level V, a rectangular wave 22 as shown by the line L4 in FIG. 2 is generated. A defective package signal is output. Note that the setting value (α) of the reference level V can be changed as appropriate depending on the thickness of the thread, the color, the accuracy of the image sensor, etc.

The above example shows the case where the level 21 is smaller than the reference level V at line L3, but depending on the condition of the thread layer surface, the amount of reflected light may be larger in some parts than in other parts, as shown in Figure 4. A signal portion 23 may occur, but by setting the reference level _VH to a value greater than the reference level _VL to cope with such a case, it is possible to identify a defective package. In other words, if there is a part where the input signal level changes on the higher side than the standard level 18 of the normal part of the thread layer surface, the reference level
If a changing part of the input signal level appears on the side lower than the standard level 18, the arithmetic unit ₁₆ compares it with the reference level _VL .
can be controlled by

Furthermore, as shown in FIG. 5, when level change portions 24 and 25 appear on both sides of the standard level 18, by comparing with the two reference levels V _H and V _L , it is possible to determine whether the level change portions 24 and 25 are different from the package 1. It is possible to identify packages that are in poor condition. That is, the analyzer 9
It is also possible to determine the type of winding defect in the package by processing the measurement input signal within and combining the reference level signal.

Furthermore, the above-mentioned inspection device can measure the package diameter and identify defective packages due to excess or deficiency in the amount of winding. That is, the light irradiation range in Figure 1 is set to a width I that is greater than or equal to the diameter width of the end face of the package (D in Figure 3), and the imaging width of the image sensor 7 is set to be a width that is greater than or equal to the diameter of the package with a normal amount of yarn. This is possible by setting the For example, at the stage where the obtained light level signal is normalized,
Let it be the level signal L5 shown in the figure. Here, range I
is the imaging range of the image sensor 7, and in range I, the number of pixels (N) of the image sensor is divided into equal pitches (μ), and the actual distance on the package of the above 1 pitch (μ) is the inspection target. This value is determined by the distance between the package and the image sensor. Also, from the signal line L5 in FIG. 6, the boundary positions A and B between the high level portions 26, 26 and the lowest levels 27, 27 are the outermost layers of the end surface of the package 1, and on both sides of the center line 28, as shown in FIG. package 1
Level 19,1 showing the defective winding portion 17,17 of
9 appears symmetrically. The low level portion 29 is a portion of the winding tube K. Note that the level position of the part K changes depending on the irradiation angle of the light, and the level position of the part K changes depending on the irradiation angle of the light.
6, 26 may protrude upwards. Therefore, count the number of pixels within the distance S between the positions A and B, multiply the counted number by the pitch (μ) between the pixels, and then use a constant to correct the actual dimensions. By multiplying by , the actual size of the distance S is calculated. By comparing this value with the outer diameter dimension of a fully wound package set in advance, it is possible to determine whether the amount of thread winding is good or bad.

When inspecting the winding defects shown on the package end face 1a in FIG. 1, in order to further prevent inspection errors, the image sensor is 7, it is possible to check not only the defective winding portions extending over the entire circumferential direction, but also the defective winding portions that appear partially.

Furthermore, if there is a defective winding part on the outer circumferential surface of the package P2 as shown in FIG.
By irradiating light over a period of time and setting the imaging range of the image sensor 7 to the above-mentioned range H, it is possible to check the winding defective portion T on the outer peripheral surface of the package. The output signal obtained by processing the level signal of the reflected light outputted from 9 includes a low level signal region 22 smaller than the level 18 of the surface portion of the package, as shown by line L4 in FIG. 2, and is output as a defective package signal. be done. In addition, when inspecting defective parts on the outer circumferential surface of the package as shown in Fig. 7, by rotating the package once around the axis of the take-up tube K, it is possible to detect defects that are not continuous on the circumferential surface. You can check the parts.

Effects of the Invention As described above, in the present invention, light is irradiated onto the radius or diameter line of the end face of the package, and the image is captured by the image sensor while rotating around the axis of the package. It is possible to reliably inspect winding defects that occur, especially defects that may be overlooked by visual inspection by the operator, and also detect changes in the amount of reflected light on the radius line for each rotation angle, making it possible to recognize patterns of winding defects. is also possible.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an embodiment of an apparatus for carrying out the present invention, Fig. 2 is a signal line diagram obtained in the case of a winding defect, Fig. 3 is a partial sectional view of the package, Figs. Figure 5 is a diagram showing an example of a signal diagram indicating a defective winding shape, Figure 6 is a signal diagram when inspecting the winding diameter of a package, and Figure 7 is a diagram showing a signal diagram when inspecting a defective part on the outer circumferential surface of a package. FIGS. 8A, 8B, and 8C are perspective views showing patterns of winding defects in the yarn package. 1... Thread package cage, 2... Yarn layer surface, 3...
...Light source, 7...Image sensor, 9...Analyzer, L1 to L5...Reflected light level signal.

Claims (1)

[Claims] 1 This is a method of inspecting the winding shape of the end face of the yarn layer of a package after rewinding spinning tube yarn, in which the reflected light irradiated on the end face of the package is divided into many parts on the radius line or diameter line of the end face of the package. An image sensor having a large number of pixels captures the reflected light at the point where the package is rotated, and images the reflected light on the radius or diameter line at each rotation angle while rotating the package around the axis of the package. A method for inspecting the winding shape of a wound yarn package, characterized in that a defective winding shape on the surface of the yarn layer appearing on the end face of the package is inspected based on a reflected light amount level signal for each rotation angle obtained by the image sensor.