JPS6262938A - Method for inspecting profile of wound yarn package - Google Patents

Abstract

PURPOSE:To detect a package having defective profile, by projecting a light beam to the surface of a yarn layer while shifting the reading position of the inspection surface of a wound yarn package, detecting the reflected light with an image sensor and removing the local impurity such as leaf and other trash from the judging object according to the information of light reflected from plural positions. CONSTITUTION:The inspection apparatus is composed of a projector 5 to project a light beam to the yarn layer surface T of a wound yarn package P and consisting of a light source 2, a mirror 3, etc., a light-detector 7 consisting of an image sensor 6, etc., an analyzer to analyze the information of received light and a rotating apparatus to rotate the package P around the shaft 9 of the package. The inspection point is scanned by the image sensor while rotating the package P around the shaft 9 at a definite rate of rotation. For example, if a cob-webbing is present at a part of the side face of the yarn layer T, protruded parts are developed successively in the lines l15-l25 and the defective profile can be surely distinguished.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a winding package inspection method.

[Conventional technology]

In automatic wine twisters and yarn twisting machines, packages wound up include packages with poor winding shapes due to various reasons. For example, a typical case of poor winding of a cone package wound by an automatic wine gourd is that the threads α1 and α2 in Figure 11 (■) (at the package end face (T) shown here) come off to the outside of the thread waste. When the unwound package (Pl) runs out of yarn on the yarn feeding side bobbin shown in Fig. 11 (II) or breaks the yarn (thread end α
3) The end of the package (P2) has fallen from the end of the package and wrapped around the take-up tube (K), or has fallen into the thread waste.
, a package (P3) called Kikumaki (G) caused by traverse shortening at the beginning of winding, a drop in tension due to slip, or a bulge as shown in FIG. 11 (III), or a no-tension or ribbon as shown in FIG. 11 (rl/) The stepped part (N
), and furthermore, there are packages with various winding defects such as a step-wound package (P4) which has a defect in the shape of the spinning bobbin on the yarn feeding side, and a ring-wound package (P5) which is caused by fluctuations in unwinding tension due to a defective shape of the spinning bobbin on the yarn feeding side.

If such a defective package is used as it is in a knitting machine or a loom, the yarn waste will not be removed smoothly, resulting in large tension fluctuations, ring removal, etc., and yarn breakage.

Therefore, in general, the winding package doffed in a wine goo is visually inspected by an operator before being transported 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.

The present invention solves the above problems and enables accurate package inspection.
Furthermore, the present invention provides a method that can automatically check the shape of a winding defect.

[Means to solve the problem]

The present invention is a method of irradiating light onto the thread layer surface of a package to be inspected and reading the reflected light with an image sensor.The present invention is a method of capturing light information at regular pitches while moving the reading position on the inspection surface of the package. , a winding defect is determined based on the optical information at the plurality of positions.

[Operation] For example, when rotating the package once around its axis, irradiating the end face with light and reading the reflected light with an image sensor, the entire circumference of the end face of the package is divided into n equal parts, and the optical information at each divided position is read. By arithmetic processing the information, the shape of the winding defect can be grasped.

〔Example〕

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

FIG. 6 shows an example of the inspection device (1). The device (
1) consists of a light source (2) that irradiates light onto the thread layer surface (T) of the thread package (P) to be inspected, a light emitting unit (4) such as a mirror (3), and a light source (4) that irradiates light on the thread layer surface (T), and Mirror that receives the light (5)
, a light receiving unit (7) such as an image sensor (6), an analyzer (8) that analyzes and processes the received light information, and a package (P) that rotates at a constant speed around the fine details of the package (9). It is composed of a rotating device (not shown), etc.

Note that the light (10) irradiated from the light source (2) is a parallel beam, and the irradiation range is as shown in Figure 7. When inspecting the package end face (T), 12) is set to a narrow range (11) that includes 0, i.e.
In order to minimize the incidence of reflected light from the surface of the yarn layer other than the measurement position entering the light receiving part, the area around the package is kept in a dark room, and the light projecting part is equipped with a light emitting part so that the light can be irradiated only on the measurement position (12). A suitable aperture is provided.

In addition, in the light receiving section (7), a lens (
The part 13) is slidable, and the operator adjusts the focus while looking at the finder (14) before starting the measurement.

In the apparatus as described above, an inspection method will be explained below.

In FIG. 7, the measurement position (12) is scanned by the image sensor while the package (P) is rotated around the axis (9) at a constant speed in the direction of the arrow (15). For example, if the rotation speed of the package is 3.03 (6) 7 rotations, the readout period of the optical information accumulated in the image sensor (
If 1) is set to j: 47.3 m5ec, one reading period (1) can be set as appropriate, and it is effective to change the number of divisions depending on the yarn type. In the case of large and thin threads, it is preferable to make the period (1) small.

Assuming that there is a thread (Yl) that has fallen off on a part of the end face (T) of the thread layer as shown in Fig. 7, it will appear on one line of the image sensor of the image sensor (as shown in Fig. 8). , by moving the twill thread (Yl) to the measurement position (12),
The light amount changing portions (Qj) to (Qm) on the lines (lj) to (I m ) for each readout cycle also move on the image sensor. That is, although a pattern as schematically shown in FIG. 8 should be obtained, the level signal after actual photoelectric conversion is in the state shown in FIG. 2. That is, in FIGS. 1 to 5,
Optical information signal (Ll) obtained by the image sensor (6)
) is an analog signal, and the signal obtained through the amplification circuit (16) and analog-to-digital conversion circuit (17) is also the second signal.
This is the illustrated level signal (L2). Therefore, in this state, it is almost impossible to determine the portion with poor winding shape.

In the present invention, as shown in the first diagram, the above signal (L2)
is a central processing unit (21) consisting of a differentiation/smoothing circuit (18), a binarization circuit (19), and an arithmetic processing circuit (20).
Analyzed and processed by.

In Fig. 2, each data signal (11) to (In) is a signal read out every cycle (1) mentioned above, and in the case of 64 divisions, 64 signals (11) to (in) are lined up. .

The width (S) corresponds to the radial length of the light irradiation range (11) in FIG.

The signal after A/D conversion (L2) is differentiated and smoothed by the differential/smoothing circuit (1
8) is shown in FIG. 3. That is, the level change part in the signal (L2) has become more pronounced, and the signal (L3) is further processed by the binarization circuit (19) to become the signal (L4) shown in FIG. At this point, the minute level change portion is deleted, and the level changes to rOJ and a signal of "1". Even at this point, the actual winding defective portion (22) and other protruding portions (23) coexist.

Next, the binarized signal (L4) is further passed through an arithmetic circuit (
20), and the parameter (X) on one scanning line and the parameter (Y) in each line direction, that is, in the time direction, are processed as a function (f(x, y)), as shown in FIG. A signal (L5) is obtained.

That is, for example, the protruding portion (23) caused by impurities such as leaf crumbs adhering to the package surface, which was seen in line (17) in FIG. 4, has disappeared in line (17) in FIG. It can be seen that the protruding portion is not a portion with poor winding shape. Therefore, as shown in Fig. 5, line (115) to line (
125), the protruding parts appear continuously, and the 8th
A signal that matches the schematic diagram in the figure is obtained. In other words,
The state of the twill drop α1) is clearly shown as shown in Fig. 5, and the actual twill drop as shown in Fig. 7 may be overlooked with the naked eye, but according to the present invention, it can be accurately grasped. be. Based on the signal (L5) in FIG. 5, a judgment is made (24) and a defective signal (L6) is output.

Regarding data processing in the analyzer (8), the signal (L4) obtained by functionally processing the binarized signal (L4)
5) will be explained with reference to FIGS. 9 and 10. The above function f (xly) is expressed, for example, by the following equation. That is, f(x, y):=f(x, Y)×(f(X+1, y
)+f(X+1,X+1)+f (X%y+1)+f
(x-1, y'+1)+f (x-1% y)+f(x
-1, y-1) + f (x, y-1) tenf (X+1
,y-1))・・・・・・・・・・・・(a) Here,
As mentioned above, X is related to the resolution of the image sensor,
If the imaging device (CCD) of the image sensor is 2048 bits, then X takes a value from 1 to 2048, and if the number of divisions is <64 as in this embodiment, y takes a value from 1 to 64.

For example, when calculating the value of equation (a) for X=:3%y=3 in FIG. 9, f(3,3)=O is obtained by substituting each position (0 or 1) in FIG.

Also, when f(2,3) is calculated, it becomes f□,3)20. Also, f(5,3)=3, f(5,4)=3
The data obtained in this way is expressed as a waveform signal as the signal (L5) in Fig. f(x%y)=f(x,y)X(f(X+1,y)+f
It is also possible to do something like (x,

In the above embodiments, a method of inspecting the end face of a cone package has been described, but it is of course possible to similarly inspect a cheese package or a package produced using a false twisting machine, a twisting machine, or the like.

Furthermore, in the above embodiment, the package to be inspected was rotated as a means for moving the reading position of the inspection surface.
It is also possible to fix the package position and move the inspection equipment side of the light emitter and light receiver.Furthermore, when reading the end face of the package, the light emitted from the light emitter side can be irradiated across the diameter of the package. If the package is rotated, it can be read by parallel movement in one direction without rotating the package.

〔Effect of the invention〕

As described above, according to the present invention, since the package is rotated and winding defects are determined from measurement signals for each fixed pitch,
Not only can local impurities such as leaf scraps and fruit scraps be excluded from the determination target, but also the shape of poor roll shape can be recognized, making it possible to perform an extremely accurate roll shape inspection.

[Brief explanation of drawings]

Figure 1 is a block diagram showing the optical information analysis method, Figure 2~
Fig. 5 is a waveform diagram showing changes in waveform signals in the analysis process, Fig. 6 is a schematic configuration diagram showing an example of a winding inspection device, and Fig. 7 is a plane showing the relationship between the measurement position of the package and the traverse thread. Fig. m8 is a schematic explanatory diagram showing the position of the twill thread appearing at the measurement position due to package rotation, Fig. 9 and Fig. 10 are schematic diagrams explaining the method of further processing the waveform signal (L4), Fig. 11 (1) to (V) are perspective views showing typical examples of packages with poor winding shapes. (1)...Inspection device (4)...Light emitter (6)
...Image sensor (7) ...Light receiving section (8)
...Analyzer (12)...Measurement position (L
l) ~ (L5)...Signal

Claims (1)

[Claims] This is a method in which light is irradiated onto the thread layer surface of the package to be inspected and the reflected light is read by an image sensor.The method captures light information at regular pitches while moving the reading position on the inspection surface of the package. A method for inspecting the winding shape of a winding package, characterized by determining winding defects based on optical information.