JPS6128033A - Apparatus for inspecting shape of yarn package - Google Patents

Abstract

PURPOSE:To carry out the detection of defective package accurately, by irradiating the surface of the package with light, and examining the defectively wound form of the surface of the yarn layer by the intensity level of the reflected light. CONSTITUTION:The surface 2 of the package 1 of wound yarn is irradiated with light from the light source 3, the reflected light is picked up with the image sensor 7, and the signal is digitized and inputted into the normalization circuit 13. The signal is compared with the preset level stored in the level comparator 15 by the arithmetic unit 16, and a signal representing the defective package or normal package is outputted from the unit. Even a small defect can be checked accurately.

Description

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

Conventional textile machinery, for example, an automatic winder that rewinds spinning tube yarn to produce packages of a predetermined size and shape, has packages that have been rolled up once, resulting in a mixture of packages with poor winding shapes due to various reasons. There is. For example, as a typical example, the yarn end (Yl) as shown in Figure 8 (a), (b) e→
An end-face falling package in which the thread has fallen from the end face opening of the thread layer and is wrapped around the winding tube or entered the thread layer (P. There are packages with various types of winding problems, such as the package (P3) that has become unrolled.If such poorly wound packages are used in knitting machines or looms as they are, they will not unravel smoothly and may cause yarn breakage. Therefore, the roll shape is generally inspected visually by an operator after the package is doffed and before it is transported to the first knitting and weaving process.Problems that the invention seeks to solve may be missed,
In addition, depending on the viewing angle, it is possible to miss checking for poor winding, which is a major problem in systems that automatically doff, transport, or package and ship from an automatic winder.

The present invention solves the above-mentioned problems and provides an apparatus that can accurately inspect single-volume defective packages.

Means for Solving the Problems The present invention provides a light source that illuminates the surface of the yarn layer of a wound yarn package, an image sensor that images the light information reflected on the surface of the yarn layer, and an image sensor that captures the light information obtained by the image sensor. An inspection device consisting of an analysis device and an analysis device is used to inspect the surface of a one-turn yarn package for defects in shape.

Example Embodiments of the present invention will be described below with reference to the drawings.

(3) A light emitting part (5) such as a lens (4), a lens (6) that receives the reflected light, and a light receiving part (such as an image sensor) (
8) and an analyzer (9) that analyzes the information received. The optical signal obtained by the image sensor (force) is converted into an electrical signal, passed through a noise remover (10), and made 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 input to a normalization circuit (13) in order to make it a signal suitable for comparison with a set level, and depending on the case, it can also be input to a memory (14) and made to temporarily stand by. The normalized signal is input to a level comparator (15) and compared with a pre-input setting level by an 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, for example, it will turn on a red lamp, or if the package is to be routed to another conveyance path, it will be output as a signal to drive the device.

For example, the end face (1a) of a package (1) to be inspected
As shown in FIG. 3, the inspection method will be explained assuming that the package is a defective pub cage with a stepped winding shape having an annular recess C17). 1st
As shown in the figure, the reflected light (X2) of the light (XI) irradiated on the end face of the package is detected by the image sensor (when taking an image by force, the reflection of the half set (d) of the package (1)) 2 (X2). When receiving light, the photoelectrically converted electrical signal (Ll) becomes the line (Ll) in Figure 2, and the noise-removed signal (Ll) becomes the line (Ll) in Figure 2.
L2) becomes the line (L2) in FIG. Here, the high level part (18) corresponds to the flat part (1a) of the end surface of the package, and the low level part (19) corresponds to the package (1) in FIG.
Corresponds to the recess (F).

In addition, another small low level portion (20) of the signal [L2]
is a minute recess that does not appear on the package surface, or if it does, it is a low-level portion caused by some kind of disturbance. Furthermore, the above signal (L2) is inputted to the normalization circuit (step 3) via the amplifier (11) and the A/D converter (12), and is then inputted into the normalization circuit (step 3), which is suitable for comparing the signal level strength. The normalized signal level (L3), which will be considered as signal (L3), is compared with a preset reference level (V), and it is determined that there is a signal portion C21) that exceeds the reference level (V). When doing so, follow the line in Figure 2 (L4
) is output as a signal having a rectangular wave (22),
A bad package signal is output. Note that the standard level (
Regarding the setting of V), the setting value (α) can be changed as appropriate depending on the thickness of the thread, one 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 partially different from other levels as shown in Figure 4. However, by setting the reference level (VH) to a value larger than the reference level (VL) to cope with such cases, it is possible to detect defective packages. can be determined.

In other words, if there is a part where the input signal level changes on the side higher than the standard level Cl8) of the normal part of the yarn layer surface, compare it with the reference level (YH), and change the input signal level on the side lower than the standard level Cl8). When a changing portion of the value appears, the calculation device (
16).

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 (Vl(yr)), the package It is possible to identify a defective wound package in a state different from (1).In other words, the type of defective package shape can be determined by processing the measurement input signal in the analyzer (9) and combining the reference level signal. It is also possible to do so.

Furthermore, the inspection device described above 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 FIG. 1 is set to a width (I) that is greater than or equal to the diameter width of the end face of the package (FIG. 3 (2)), and the package with a normal amount of yarn is set during imaging by the image sensor (7). This is possible by making the width larger than the diameter of the

For example, when the obtained light amount level signal is normalized, it is set to the level signal (L5) shown in FIG. 6, for example. here,
The range CI) is the imaging range of the image sensor (force), and the range (I) is divided by the number of pixels of the image sensor (to) at an equal pitch Cμ), and the actual image size on the above-mentioned 1-pitch (μ) package is The distance is a value determined by the distance between the package to be inspected and the image sensor. Also,
From the signal line (L5) in Figure 6, the high level portion (26) (
26) and the lowest level (27) (27)
A) Level (,19) (19) packaged by CB) is symmetrically shown. The low bell portion (29) is the winding tube (
). Note that the level position of this portion changes depending on the irradiation angle of the light, and may protrude upward from other portions (26) (26). Therefore, the above position (5)
Count the number of pixels within the distance (S) between CB>, multiply the counted number by the pinch (μ) between the pixels, and then multiply by a constant to correct the actual size. For example, the actual size of the distance Jim (S) is calculated. By comparing this value with the preset outer diameter dimension of a full package, it is possible to determine whether the amount of bobbin winding is good or bad.In order to prevent further inspection when inspecting for defects in the winding shape that appear, If the package (11) is rotated once around the axis of the winding tube (towards) and the image sensor (force) is used to read the data, it is possible to check for defects in the winding over the entire circumferential direction. Furthermore, if there is a defective winding area on the outer circumferential surface of the package as shown in Figure 8 (B), check the package as shown in Figure 7. By irradiating light over the entire area □ in the generatrix direction of the outer circumferential surface of (P2) and setting the imaging range of the image sensor (force) to the above range opening, it is possible to check for defective winding portions on the outer circumferential surface of the package. In this case as well, the output signal obtained by processing the level signal of the reflected light output from the analyzer (9) in Figure 1 is the level (18) of the surface portion of the package, as shown by the line (L4) in Figure 2. It includes a low level signal range (22) that is smaller than By rotating the package once around the axis 5), it is possible to check for partial defects that are not continuous with the curve.

Effects of the Invention As described above, in the present invention, an image is taken by a package diameter sensor that winds yarn, and defective winding portions on the surface of the yarn layer are inspected based on the level signal of the amount of reflected light obtained. It can accurately check even relatively small defective parts, making it extremely effective for determining whether the winding shape of a package is good or bad9.

[Brief explanation of the drawing]

Figure 1 shows an example of the device according to the present invention; Figure 5 shows an example of a signal diagram indicating a defective winding shape; and Figure 6 shows a signal diagram when inspecting the winding diameter of a package. , Fig. 7 shows the direction of light irradiation and reflection when inspecting defective parts on the outer peripheral surface of the package, and Fig. 8 (a) (c) shows the pattern of winding defects of the wound yarn package. FIG. (1)... Thread package (2)...
Thread layer surface (3)...Light source (7)...Image sensor (9)...Analyzer (Ll) to (L5)...Reflected light level signal. Figure 3 Figure 7 θ Figure 8

Claims (1)

[Claims] A light source that illuminates the surface of the yarn layer of the wound yarn package, an image sensor that images the light reflected on the surface of the yarn layer, and an analysis device that analyzes the optical information obtained by the image sensor and outputs a signal to determine whether the winding shape is good or bad. A winding shape inspection device for a winding package, characterized by comprising: