JPS5876571A - Detection of feather - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for detecting fuzz on yarn, and more particularly to a method for detecting fuzz that can stably detect not only running yarn but also yarn fuzz on the surface of a yarn roll.

Conventionally, the following two methods have been mainly used to detect fuzz on yarn. One method is to irradiate the yarn with light and receive the shadow of the entire yarn, including the fluff, with a light-receiving element such as a photodiode, and detect the quality of the light quantity with and without fluff. The other method is to detect the change in the amount of light with and without fluff by detecting the shadow of the yarn itself with the light receiving element, but not with the light receiving element. This is a fluffy way to detect.

However, the conventional method described above has the following problems. In other words, in both cases, fuzz is detected by changes in the amount of light transmitted by seven feathers, but the fuzz that normally occurs on thread brass is extremely small, ranging from a few microns in diameter to 10 microns in ridges, and a few microns in length. The change in the transmitted light Ji with and without fluff received by the child is minute. Therefore, the difference in the electrical output signal between the light-receiving element with and without fluff is minute.
The N ratio (signal-to-noise ratio) is low, and the output signal processing of the light receiving element is delayed and determined, making it difficult to detect fuzz with good reproducibility. In addition, even slight disturbances such as disturbance light reception or changes in the light and sound of the light source lamp can occur, so that it cannot be applied to detecting fuzz on the surface of a wound product such as paan or cheese.

The present invention provides a fluff forming method V which eliminates the drawbacks of the conventional fluff detection method and also enables detection of fluff on the surface of a wound yarn body.
This is what we provide.

In other words, this fuzz detection method is characterized by irradiating an area close to the yarn with a laser beam so as to irradiate only the fuzz, and detecting the fuzz on the yarn by the light scattered by the laser beam caused by the fuzz. be.

The present invention will be explained below with reference to the drawings. FIG. 1 is a detailed explanatory diagram of the present invention, and FIGS. 2(a) and 2(b) are an overall diagram of an embodiment in which the present invention is applied to detecting fuzz on a bobbin body, and 1Fmd.
This is a clear diagram.

First, a method for detecting yarn fuzz will be explained using diagram g1.

Y is a yarn running in the direction perpendicular to the paper plane of the figure, l is a fluff that is a construction target existing on the running yarn Y, and 2 is He −N
Laser light source consisting of e laser, 3 is laser light source 2
It is a narrow beam of laser light that is emitted from the center. The irradiation laser beam 3 is so arranged that it irradiates only the fluff 2 and does not irradiate the yarn Y directly, but instead irradiates a region close to the yarn Y. 4 is a photodiode which is a photoelectric conversion means for detecting the scattering i5 caused by the fluff 1 generated when the fluff 1 of the yarn Y is irradiated with the laser beam 3, and is provided on the same side as the laser light source 2 with respect to the yarn YK. It is.

In the above configuration, if there is no fuzz l on the yarn Y,
The irradiated laser beam 3 only passes through the vicinity of the yarn Y, and the scattered light 5 is not generated (the scattered light 5 is generated only when the irradiated laser beam 3 irradiates the fluff 1, and therefore only when the fluff 1 is present). .

Therefore, the scattered light 5 does not enter the photodiode 4, and the photodiode 4 emits a small electrical signal corresponding to the background light. Note that this background light can be made very small by using a dark box configuration for the detection unit.
Wear.

On the other hand, when the fluff 1 exists on the running yarn Y, when the fluff 1 crosses the irradiated laser beam 3, the irradiated laser beam 3 is scattered by the fluff IK as shown in the figure, and scattered light 5 is generated. This scattered light 5 is weak when using an ordinary light source such as an incandescent lamp or a fluorescent lamp, and is almost undetectable because background light from the light source itself is unavoidable, but in this example using laser light, The scattered light 5 has a very low brightness that can be easily detected.Specifically, the intensity of the scattered light 5 due to the laser beam 3 described above is determined by the fact that the running yarn Y can be visually observed. When visually observed with the MILK pack ground made so small that it could not be seen, not only the fluff 1 but also the yarn Y running near the fluff 1 was at a level where it could be illuminated by the laser beam. This is thought to be because the energy of the laser beam is very large.In addition, since the laser light does not become background light, it is also very effective in improving detection sensitivity.

The scattered light 5 is then received by the photodiode 4. As described above, the scattered light 5 is very strong, so the photodiode 4 emits a much larger electrical signal than in the case of only the background light without the fluff 1 described above. Therefore, the electrical signal from the photodiode 4 is guided to a well-known specific soft circuit (not shown) or the like, and its level V is monitored, and when it reaches a predetermined level or higher, a pulsed fluff detection signal is output. This makes it easy to detect the fluff 1 itself. At this time, as mentioned above, since 11kK laser light is used, the level difference in the electrical signal from the photodiode 4 due to background light, scattered light 5, and K is large (
Therefore, detection sensitivity can be greatly improved, and stable detection with good reproducibility can be achieved. Output 1 raw, irradiation laser light 3
Using a He-Ne laser with a beam diameter of 0.5,
It was possible to reliably detect fluff l with a diameter of 2 to 3 μmφ and a length of about 11.

In addition, since the fluff detection signal mentioned above is generated for each fluff,
1 Guide the fluff detection signal to a known counter U path (not shown)! By determining the number of fuzz per unit length of yarn Y, etc., can be easily obtained.

The principle of the present invention has been explained above using an example of running yarn.

Next, an example applied to detecting fuzz on the surface of a thread body will be described with reference to FIG.

In the figure, P is the bobbin formed by the thread winder, 1 is the fluff on the surface of the bobbin to be detected (PO), and 2 is H as in the previous example.
A racer light source using an e-Ne laser, 3 the same irradiated laser beam as in the previous example, 4 a photodiode which is a photoelectric f supply means for emitting 5V of scattered light of the irradiated racer light 3 by the fluff 1; It is provided on the upstream side of the irradiated laser beam 3 with respect to the bobbin body P so as to detect the reflected portion.

Then, the radiation laser jt3 is placed at the focal position of the paraboloid of the scanning mirror 12 and the scanning mirror 12 made of a paraboloid ElIIM placed at 5 so that its radiation gIJ plane is parallel to the axis of the pincushion P. The predetermined scanning angle f11 is set to a predetermined scanning speed g.
The vibrating mirror 11, which scans at V, is configured to move and scan in the axial direction while non-radiating a nearby area on the surface of the bobbin body P in a direction orthogonal to the axis. In addition, the scanning angle FIIL
ρ is selected to be large enough to cover the portion W of the bobbin P during scanning. Furthermore, the irradiated laser beam 3 is spaced from the surface of the bobbin body P as shown in the second factor (b). If a longer fuzz 1 is present, the irradiated radar light 3 will pass through the scanning mirror 2-
12, the light is scattered by the fluff IK in the darkness scanning from point a to point b, and scattered light 5 is generated. Therefore, in the case of FIG. 2(a), 2 (b) scattered lights 5 are generated in chronological order by the 2 @ fluffs 1 in the front and in the actual measurement. This scattered light 5 is converted into an electric signal by the photodiode 4 as in the example of FIG. 1, and the ratio 421! ll! 1, it is processed in a counter circuit and displayed as the desired number of fuzz for each bobbin. When H1 is R at the above-mentioned position, the bobbin body P is rotated between the rotating arms (Illustrated-1i
) and is rotated around the axis at a predetermined speed corresponding to the scanning speed.

By the way, in this example, unlike the conventional method, a laser beam with sharp directivity is used, so the above-mentioned interval l is very small w.
In addition, even small hairs (U1) can provide enough scattered photoelectric light 5 for detection, making it possible to perform highly sensitive and stable detection. As in the previous example, in this example as well, the output 1
my.

Using a He-N6 laser (beam diameter: 0-5 wdf), fluff with a diameter of several μm and a length of 1 μm could be detected with sufficient certainty.

Although the present invention has been explained above based on Examples, the present invention is not limited to such actual examples.

Although the laser source used for He-Ne laser f- is shown, other laser f sources (semi-dedicated laser, C
It goes without saying that false lasers, N lasers, etc.) can also be applied.

The simplest configuration is one that inspects only one side of the traveling yarn. Alternatively, the laser beam can be reflected back with a reflector to measure both sides, or two laser light sources can be used to configure the double-sided inspection configuration to achieve 4FFI standard. By doing so, it is possible to reduce the number of missed detections.

In addition, we have shown a method in which the number of fuzz can be reliably detected by scanning the bobbin body in the axial direction with a laser beam perpendicular to the axis of the bobbin body. (b) If the optical scanning mechanism is rotated, an optical scanning mechanism is not required at all, and the structure can be greatly simplified. Incidentally, the scanning mechanism is not limited to the example described above, and may be configured such that scanning is performed by the reflected light of the vibrating mirror, or other known scanning mechanisms may be used.

History has shown that scattered light is converted into an electrical signal using a charging conversion element such as a photodiode, and visual detection is also possible by using a laser beam #i such as a He Ne laser that generates scattered light or visible light. be. In this case, as mentioned above, the scattered light is very bright, so the inspection work becomes extremely easy and the possibility of horizontal placement errors is greatly reduced.

In addition, light #! is applied to the measurement yarn so that the most concentrated reflected and scattered light among the scattered light is detected. Although we have used a device with a photoelectric detection means installed on the side, if the background light is reduced as mentioned above, detection can be made at any location on the yarn, and the location where the charge detection means is installed can be adjusted. Not particularly limited.

Note that the near-rut area of the yarn that is irradiated with laser light is an area where fuzz exists, and as long as the laser light does not directly irradiate the yarn, roots that are close to the yarn and the length of the fuzz that can be detected are short. Since the length of detection increases or the number of threads coming out due to thread return increases, it is necessary to determine the balance between the length and the normal fluff length.゛Returning to the above explanation, in the present invention, the near pleat slope of the yarn is irradiated with a laser beam, and the scattered light from the fluff of the laser beam makes it look fluffy. It can be detected by the scattered light of Omoto violet, and the 8N ratio has been greatly improved. Therefore, it is softer than the conventional method, has a very simple configuration, has no detection sensitivity, is extremely reproducible, and has a high g! A hair texture detection method with good axiality was obtained. Furthermore, the present invention is not applicable to fluff fK on the surface of the thread wound body.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of an example in which the present invention is applied to a traveling yarn;
Figures (a) and (b) are an overall explanatory diagram and *sWi clear diagram of an example in which the present invention is applied to a thread wound body. fluff, 2: laser light source, 3: irradiation laser light, 4:
Photodiode, 5: Scattered light, Y: Yarn, P: Thread wound body.

Claims (1)

[Claims] 1. In a method for detecting fuzz on a yarn, a laser beam is irradiated to a nearby area of the yarn so that only the fuzz is irradiated, and the fuzz on the yarn is detected by the light scattered by the laser beam by the fuzz. A fluff detection method characterized by detecting fluff. 2. The fluff detection method according to claim 1, wherein the scattered light is detected by photoelectric conversion. 3. The fluff detection method according to claim 2, wherein the method for detecting fuzz is carried out using a photoelectric conversion means provided on the light source side of the laser beam with respect to the photoelectric conversion yarn. 4o Arrangement No. 1 of the patent claim in which the yarn is a running yarn
2. The fluff detection method described in Section 2, Second Dust, or Third Spear. 5. Patent II'l, wherein the thread is a thread on the surface of the light wrapper.
The fuzz detection method described in the first, second, or third range of IX.