JPS61119731A - Method for inspecting package form of yarn winding package - Google Patents

Abstract

PURPOSE:To make it possible to detect an abnormal part of a package with a high accuracy, by irradiating a specific position of the package with light, inputting the plural reflected beams of light reflected from the position in many directions to a single image sensor, and subjecting electric signals to signal processing. CONSTITUTION:For example, the presence or absence of jumping yarn or abnormal bulge, on the end face of a package (P)is optically inspected. In the process, the end face is irradiated with a slitlike beam of light (PH1) from a light source 4 in the radial direction of the package (P). Specific two beams of light (PH2) and (PH3) of the reflected light reflected from the irradiated part in many directions are made to fall on a single image sensor 6 with reflecting mirrors 7, 8, 9 and 10. Electric signals obtained by the image sensor 6 are input to an analyzer 12 and processed with a noise canceller, amplifier, A/D converter and normalizing circuit therein, and the resultant signals are compared with the previously inputted set level to detect an abnormality.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for inspecting the winding shape of a yarn package.

[Conventional technology]

BACKGROUND ART In winding machines such as automatic winders and twisting machines, packages wound up include packages with poor winding shapes due to various reasons. For example, as a typical example, at the end face (T) of the package shown in FIG. 8 CI+, an off-twill package (P
I), Fig. 8 (When the spinning bobbin shown in Ml has finished winding,
When yarn breakage occurs, the yarn end (Yl) falls off the end of the package and wraps around the take-up tube (K), or the end of the package (P2) falls into the thread waste, as shown in Figure 8 (1111).
A package (P3) called Kikumaki (G) caused by shortening of the traverse at the beginning of winding, a drop in tension due to slip, or a bulge, as shown in Figure 8 (shown in [vl) ~ Tension or bulges on the end surface caused by ribbon winding. A package called a swollen ball (P4) with a stepped part (N), and a tree-ring package (P5) caused by fluctuations in unraveling tension due to a defective shape of the spinning bobbin. There is a package.

If such a defective package is used in a knitting machine or a loom, smooth yarn layering will not occur, large tension fluctuations will occur, ring fluid will occur, and yarn breakage will occur.

Therefore, in general, the winding shape of a full package doffed by a winding machine is visually inspected by an operator before being conveyed to a subsequent process.

[Problem that the invention seeks to solve]

In the above-mentioned inspection method, a minute defective part may be overlooked, and a defective winding shape may be checked incorrectly depending on the viewing angle. For example, there is a high possibility of a check error, especially in an off-twill package as shown in FIG.

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

[Means to solve the problem]

The present invention irradiates the surface of the thread layer of the package with light, and reads the reflected light from multiple directions at a specific measurement position using a single image sensor via multiple reflecting mirrors, and transmits the reflected light to the same image sensor of the image sensor. Defective portions of the winding are inspected by comparing a level signal of optical information obtained by inputting reflected light from a plurality of directions with a preset standard of one novel.

[Effect]

By reading a specific measurement position from multiple directions with one image sensor, the resulting level signal waveform is smoothed, and only the defective area becomes a level signal that is more prominent than other areas, making the defective area clear.

〔Example〕

In Fig. 1 and Fig. 2, an inspection apparatus (1
) is shown below. The device (1) applies light (PI-11
), a light emitting unit (4) such as a light source (2), a lens (3), etc.
) and the light reflected on the thread layer surface (1” ((2M PI (3
), an image sensor (6), and a reflecting mirror (71) for making reflected light (PH2) (P113) from multiple directions incident on one image sensor (6).
(Light receiving section (11) consisting of (81, (9), (10), etc.)
, furthermore, an analyzer (1) for analyzing the received optical information.
2).

The light emitted from the light source (2) is emitted from a direction substantially perpendicular to the yarn layer surface (T), and the irradiation range is as shown in Figure 4. Set to a narrow range (E) that includes the measurement position (A). In other words, in order to minimize the amount of reflected light from surfaces other than the measurement position entering the light receiving section, the area around the package is kept in a dark room, and a diaphragm is placed on the light source so that light can be irradiated only to the measurement position (A). It is desirable to do so.

In addition, a mirror of an appropriate size is determined based on the length of the above-mentioned reflecting mirror (7; The reflecting mirror (91 (10) reflects light in two directions (PH2)
(PH3) is incident on one image sensor (6), the mirror surface (9) and the mirror surface (7) of one mirror face each other at a fixed angle, and the mirror surface (10) and the mirror surface (7) of the other mirror face each other at a fixed angle. 8) are placed opposite each other at a certain angle. Furthermore, the reflecting mirror f71 (81 (91 (10)) is adjusted so that the reflected light from a specific position on the package (Fig. 4 (A)) is incident on the image sensor of the image sensor without phase shift. That is, reflected light from a plurality of directions at the same measurement position is incident on the same image sensor of an image sensor in which a large number of image sensors are arranged at equal pitches on a straight line.

The optical signal obtained by the image sensor is photoelectrically converted and input as an electrical signal to the analyzer (12) shown in FIG. 3. That is, the signal is passed through a noise remover (13), converted into a signal of a size suitable for processing by an amplifier (14), and further converted into a digital signal via an analog-to-digital converter (15).

The signal is input to a normalization circuit (16) in order to make it a level signal suitable for comparison with a set level, and depending on the case, it is also possible to input it to a memory (17) and make it temporarily standby. The normalized signal is input to the level comparator (18), which compares the pre-input setting level with the arithmetic unit (19).
) is used for comparison calculations. As a result of comparison using the method described below,
If there is a level signal exceeding the set level, a defective package signal is output, and a command signal is output to turn on a red lamp or drive the device to route the package to another conveyance path.

(p) is a case where the yarn (Y) with a twill drop is wound around the end surface (T) of the yarn layer. Package (P) is arrow (20)
Inspect by rotating the take-up tube (K) once in the direction,
At a certain point, it assumes the position shown in Figure 4. Since the light irradiated onto the end face of the package and the cage is irradiated in a direction substantially perpendicular to the end face of the package as described above, for example, at the measurement position (A),
Assume that a shadow portion (B) is generated on the surface due to a thread (Y) that has fallen off the twill or fallen off the end face as shown in the figure. Note that the shadow area (B) above is shown as a shape for illustration purposes, so depending on the type of package defect, it may not be a shadow, but may be a normal piece of thread that reflects less or more light than other normal surfaces. These are so-called abnormal reflection points, including areas where there is a difference in the amount of reflected light on the surface.

If the reflection directions at the measurement position (A) are two directions (PH2) (PH3) as shown in Fig. 4, one reflected light (PH2) passes through the mirror (71 (91) shown in Fig. incident on the sensor (6) and other reflected light (PH3)
is connected to the same image sensor (6) via a mirror (81 (10)).
). At this time, as shown in FIG.
Even if H2) (PH3) changes, the same position is read.

Therefore, suppose that the optical signal (Ll) due to only the reflected light (PH2) in one direction becomes a diagram as shown in Figure 6 (11).The peak point (Xl) is the abnormal point (B) on the surface of the yarn layer. However, the difference from other reflected light amounts is small, and it appears as if there are many abnormal points.Therefore, the settable range (81) of the reference level for comparison is small, and depending on how the settings are made, abnormal points may be overlooked, or abnormal points may be detected. If even the points are abnormal, there is a risk of a misjudgment.

In addition, an optical signal consisting only of reflected light (PH3) in another direction (
Assuming that L2) is as shown in FIG. 6(1), the above-mentioned fear also exists in this case.

On the other hand, when the reflected lights (PH2) and (PH3) in the two directions are read simultaneously or in combination with the same image sensor, the obtained optical signal (L3) becomes as shown in Fig. 6 (ml). , the reflected light other than the abnormal point interferes with each other due to the difference in the reflection direction, and shows a nearly constant reflected light level M, and only the abnormal point, that is, the shaded part (B) in the above example, is characteristic. Therefore, although the reading directions by the image sensor were set to two directions above, by reading from more directions, the optical signal waves are averaged and the normal state of the package surface is detected. The reflected light level of the portion is almost smoothed, and only the reflected light level of the abnormal portion is in a prominent state, and furthermore, the settable range (S3) of the reference level becomes wider and setting becomes easier.

The level signal (L3) obtained in this way can be visually observed directly with an oscilloscope, but in the case of automatic discrimination, the above level signal conversion 3) is performed using the analyzer (1) shown in Figure 3.
2), passes through the normalization circuit (16), becomes the normalized level signal 4) shown in FIG.
), and when there is a level part (Z) that is higher than the reference level (Q), the rectangular wave (
L5) is issued as a defective wound package signal. Note that the setting of the reference level (Q) can be changed as appropriate depending on the thickness of the thread, the color, the accuracy of the image sensor, etc.

In the above example, the reference level (Q) was set above the standard level (L4a) of the level signal (L4), but it can also be set below or on both sides. The level (Z) may be located on the lower side or on both sides, and in either case, settings must be made to prevent discrimination errors.

Fig. 7 shows another example of the inspection device, in which the light (PHt) emitted from the light projection unit (4) that irradiates the end face of the package (I) is transmitted to four mirrors (21) to (24). The light reflected by (P
H2) to (PH5) are further input to one image sensor (6) via reflectors <25) (26), and as mentioned above, one measurement position on the package is read from four directions. Furthermore, the obtained light level signal can be made clearer. In this case as well, the irradiated light (PH1,) is preferably perpendicular to the thread layer surface (T), and the reflected light (PH2) to (PI(5)) are centered around the direction of the irradiated light (PH1). Same angle on both sides (θ1
)(θ2), and it is desirable to arrange the mirrors (21) to (26) so that the reading direction is an even-numbered direction.

Further, in the above embodiment, as shown in FIG. 4, an inspection method is shown in which a straight line on one radius of the package end face is set as the measurement position and the measurement position is read from multiple directions. It is also possible to set a similar straight line in the vicinity as another measurement position and read from multiple directions at each of the two measurement positions in the same manner as described above.

That is, in this case, one more image sensor (6) shown in FIG. 1 is installed, and each image sensor separately reads reflected light from two adjacent measurement positions. For example, a defective rolled package is determined only when the optical signals of both image sensors have a level exceeding the reference level, and only the optical signal of one image sensor is detected. If there is a level part that exceeds the standard level, or if there is no part of the level that exceeds the standard level in the optical signals of both image sensors, it is determined that the package is a normal rolled package. It is possible to prevent erroneous judgments due to impurities such as dust, fruit dregs, leaf dregs, etc. In this case, the distance between the two measurement positions on the package surface is 2.
Approximately 5 pairs of shoes.

Effects of the Invention As described above, in the present invention, by irradiating light onto the package surface and reading the reflected light from multiple directions with a single image sensor, the light level obtained from the light reflected from the normal thread layer surface is uniform. This makes it possible to increase the difference between the light amount level obtained from the reflected light of the abnormal part, and to easily determine whether the winding is defective, thereby preventing check errors and misjudgments.

[Brief explanation of drawings]

FIG. 1 is a schematic plan view of an apparatus for carrying out the method of the present invention;
Fig. 2 is a front view of the same, Fig. 3 is a block diagram showing an example of the analyzer, Fig. 4 is a perspective view showing the reading position on the end face of the package, and Fig. 5 shows the relationship between the reading position and the imaging element of the image sensor. FIG. 6 is a diagram showing the type of level signal (1) to fVl, a line diagram showing the discrimination signal (V), and FIG. 7 is a schematic configuration plan view showing another example of the inspection device. , FIGS. 8(1) to 8(V) are perspective views showing typical examples of packages with poor winding shapes. (6)...Image sensor (A-)...
Measurement position (Ll) to (L4)...Level signal (
L5) 110 discrimination signal (P)...Package (Q)...Reference level (PH1)...Irradiation light (PH2)~(PH5)...Reflected light (T)
... Thread layer surface Figure 8 Procedural amendment (method) March 1985 / Date] Indication of the case 1982 Patent application No. 240804 8 Person making the amendment Relationship to the case Patent applicant address 601 Date of the order to amend the procedure for 3-4 procedure amendments: February 6, 1985 (Shipping date: February 26, 1985)
6. Contents of amendment 6-1 Brief explanation of drawings in the specification, page 13, 10~
Correct line 11, ``Figure 6 ~(g) is a line diagram showing...'' to ``Figure 6 is a line diagram explaining the level signal and discrimination signal.''I"2

Claims (1)

[Claims] Light is irradiated onto the surface of the yarn layer of the package, and a single image sensor reads the reflected light from multiple directions at a specific measurement position, and the level signal of the light information obtained by the image sensor is compared with a preset reference level. A method for inspecting the winding shape of a winding package, characterized in that the winding shape is inspected by comparing the winding shapes.