JPH0825691B2 - Method of detecting thread breakage of warp knitting machine and device used therefor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a yarn breakage detection method for a warp knitting machine.
Method and the equipment used for it, more
Between the knitting needle and the guide (sa) where the most thread breakage occurs
The present invention relates to a yarn breakage detection method and device capable of surely detecting the presence or absence of yarn breakage.

[0002]

2. Description of the Related Art Knitting with a warp knitting machine, a loom, a warper, etc.
When performing various processes such as forming, weaving, winding, and sizing,
In order to prevent defective products as much as possible,
Detects warp yarn breakage quickly and accurately before applying
Is important. Thus, this thread breakage detecting device, detection reliability for detecting a miss or false without reliably thread breakage
And shortening of response time from occurrence of yarn breakage to stop of each processing operation are required.

Conventionally , a yarn breakage detecting device such as a warp knitting machine or a loom is used.
For the warp , use a dropper that falls by its own weight when the thread breaks.
Dropper type yarn breakage Fi which to attach one by the
It is much more responsive than this dropper system.
It was common to use a good photoelectric warp feeler.

This photoelectric warp feeler has a large number of warp threads.
Narrow the widthwise direction between thread sheets that are arranged in parallel in a plane.
Unnecessarily and oppositely arranged an emitter and receiver on opposite sides, the cutting thread has expired either thread is that emits a fault signal when the blocking the light of the light receiver. This photoelectric warp feeler
Is excellent in yarn breakage responsiveness because it can detect the entire yarn sheet all at once at the same time, while it is a method of detecting the cutting yarn , so it is possible to detect the influence of fly cotton and other flying objects. Ear thread
Also waving phenomenon or the like often cause a malfunction due to the,
When the cutting yarn is entangled with other aligned yarns or when the yarn is a stretchable yarn such as spandex, it is difficult to detect the cutting yarn due to shrinkage of the cutting yarn .

Therefore, recently, as a device for surely detecting a yarn break without misidentification, a light emitting / receiving device is used as a yarn sheet or a fiber.
A photoelectric scanning feeler has been proposed, which scans in the width direction of an object and recognizes the threads one by one to check for thread breakage. However, the photoelectric scanning feelers that have been proposed so far are methods that count the warp yarns one by one in the width direction, so it takes much time to scan the yarn sheet in the width direction, and yarn breakage occurs. There is a large time difference from the detection of the yarn breakage to the detection of the yarn breakage, and although the detection reliability is improved, the response is not satisfactory.

By the way, in a warp knitting machine for knitting a large number of yarns,
In fact, the most likely thread breakage occurs at high speed during knitting.
The knitting needles and guides (sacks) that perform operations. Also
Instead, in the conventional warp knitting industry, yarn breakage detection on this warp knitting machine
As for the take-out, many warp yarns, such as those near the tension bar, are
The thread sheet part is made by aligning in parallel and in a plane.
I was being damned. That is, the photoelectric scanning / photoelectric scanning as described above
Type liner is used to
In the textile industry, where yarn breakage detection was performed for
A large number of warps continuously cross at high speed
The position changes intricately in the depth direction while doing or skewing.
The warp knitting machine's knitting needle-guide section detects thread breakage.
There was no such idea as nau.

Therefore, the photoelectric method at the yarn sheet stage
・ After passing the yarn breakage detection by the photoelectric scanning feeler
If thread breakage occurs around this knitting needle-guide,
As a result, we will knit a product with poor thread breakage,
After knitting, this defective product can be manually or advanced imaged
Detect using an expensive inspection device that makes full use of processing technology
There was no help for it. In recent years, more and more used raw yarns and braids
Warp knitting industry in which weaving is complicated and expensive products are knitted
At the knitting needle-guide periphery due to thread breakage
The loss of anti-knitting cannot be ignored in order to reduce the manufacturing cost.
It is a serious problem .

[0008]

The present invention has been made in view of the above-mentioned problems in the conventional yarn breakage detection technology of a warp knitting machine. Easy to do
Between the knitting needle and the guide, the reliability of thread breakage detection and the reliability of thread breakage detection can be detected without failing to cause malfunctions due to the influence of flies and the like , and the occurrence of thread breakage can be detected immediately.
A method of detecting yarn breakage of a warp knitting machine that achieves both response and its use.
The technical problem is to provide a device for use .

[0009]

The present invention is based on the above technique.
Many threads are parallel or diagonal to solve
To detect thread breakage of the yarn row S before knitting in parallel with the state
In the knitting cycle of the warp knitting machine, the knitting needle N and the guide G
It exists between the knitting needle N and the guide G at the moment of separation.
The existing thread rows S are arranged in the width direction of the thread rows S.
The yarn is picked up by the CCD camera 1 which is reciprocally moved on the reel R.
The required range is imaged along the width direction of the row S, and the CCD
The image pickup signal of the image pickup range output by the camera 1 is binarized for each pixel.
Processing, and the total number of 1-pixels and 0- in this imaging range
Calculate the ratio with the total number of pixels as the current thread value, and
The current value is entered in the presetter 2 in advance and the yarn in the imaging range is entered.
By comparing with the thread normal value corresponding to the unbroken state
Technical means for judging whether or not there is a thread break in the thread train S
It was adopted.

Further , according to the present invention, a yarn for detecting a yarn breakage of a yarn row S before knitting in which a large number of yarns are arranged in parallel or in a skewed state.
A breakage detecting device, which is arranged over the width direction of the yarn row S.
The set has been rail R on the carrier C to round trip; this
It is installed in the carrier C, organized cycle of the warp knitting machine
The knitting needle at the moment when the knitting needle N and the guide G are separated
Width direction of the yarn string S yarns string S that is present between the N and the guide G
A CCD camera 1 capable of picking up a required range along each direction ;
The imaging range of the CCD camera 1 installed on the same carrier C
A light source L for illuminating the yarn row S of; and a knitting cycle of a warp knitting machine
While synchronizing, the image pickup timing of the CCD camera 1 and
A camera controller 4 for controlling the reciprocating movement of the carrier C;
A setting device 2 for outputting a value corresponding to a state in which there is no yarn breakage of the yarn row S within the image pickup range of the CCD camera 1 as a yarn normal value.
And; the image pickup signal of the image pickup range output from the CCD camera 1 is binarized for each pixel, and 1-image in this image pickup range is obtained.
The ratio between the total number of primes and the total number of 0-pixels is the current thread value.
Calculate and output this yarn current value from the setter 2.
The thread breakage of the thread row S by comparing with the normal thread value
A comparison control unit 3 determines whether the; employing the technical means referred.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the embodiments shown in the accompanying drawings. Note that FIG. 1 shows the overall configuration of the apparatus of this embodiment .
FIG. 2 is a schematic side view for explaining the whole structure of the apparatus.
FIG. 3 is a schematic front view showing the yarn breakage detection method of the device.
That the block diagram, CCD camera of FIG. 4 and FIG. 5 is the apparatus
1 is the knitting needle N and the guide G in the knitting cycle of the warp knitting machine.
It exists between the knitting needle N and the guide G at the moment of separation.
It is a schematic explanatory drawing which shows a mode that the required range of the thread row S was imaged .

As shown in FIGS. 1 and 2, the yarn of this embodiment
The breakage detecting device is provided with the knitting needle N of the knitting mechanism portion of the warp knitting machine.
Thread breakage detection for the thread train S existing between the guide G and
This is done by arranging many charge-coupled devices in a plane.
The CCD camera 1 composed of the
It is fixed to the carrier C that travels back and forth over the entire width.
With the CCD camera 1 that scans the yarn row S of
At the moment when the knitting needle N and the guide G of the kuru are separated.
The thread string S existing between the knitting needle N and the guide G
It is configured such that a required range is imaged along the width direction and the yarn breakage detection is performed for each imaging range .

The carrier C for reciprocating the CCD camera 1 is a timing belt driven by a motor 5 along two rails RR that are laterally stretched across the entire width of the yarn row S. Travel back and forth with B. Also in this carrier C, the light source L to illuminate the yarn string S of the imaging range of the CCD camera 1 is mounted, in the present embodiment, the light emitted from the halogen lamp L, via a fiber optic bundle L ₁ C
The yarn row S is guided evenly to the CD camera 1 and the light emitting end of the optical fiber bundle L ₁ is arranged in a ring shape around the lens portion of the camera so that the yarn row S is uniformly illuminated.
Also, in the figure, the one designated by the symbol F is the forward of the carrier C.
The flexible cable duct is a well-known flexible cable duct that bends in accordance with the backward travel, and a power source line for the halogen lamp L, a signal line of the CCD camera 1, and the like are drawn through the flexible cable duct F.

Next, the yarn breakage detection method of the present embodiment will be described.
This will be described in detail with reference to FIG.

First, as described above, the CCD camera 1
The yarn train S between the knitting needles N and the guides G of the warp knitting machine is imaged by a required range (see FIGS. 4 and 5), and the image pickup signal is compared with the comparison controller 3.
Output to. The comparison controller 3 which has received the image pickup signal first binarizes the image pickup signal into [1 and 0] for each pixel.
Then, the total number of 1-pixels and 0-pixels in this imaging range
The ratio with the total number is calculated as the yarn present value, and this yarn present value is compared with the yarn normal value output from the setter 2.
The presence or absence of thread breakage is determined by checking

This normal thread value is input to the setting device 2 in advance.
1-the total number of pixels and 0-in the imaging range where there is no thread breakage
It is a value corresponding to the ratio of the total number of pixels, and the comparison controller 3 compares the yarn normal value with the yarn current value and when they do not match , the warp knitting machine motor M and the camera controller described later . An abnormal signal is sent to the No. 4.

More specifically, as shown in FIG.
When one warp is cut in the image area, the part where the warp exists (the black line part in the figure) and the warp does not exist
The ratio of the area to the background portion (white background portion in the figure) is shown in FIG.
It should be different from the area ratio under normal conditions without yarn breakage shown in
become. That is, the ratio of the area of the warp yarn existing portion (black line portion)
In case of thread breakage (Fig. 5) than in normal condition (Fig. 4)
Also becomes smaller. The detection method of the present invention is a knitting needle N-ga of a warp knitting machine.
Between Id G, each warp is irrespective of the yarn fineness and warp knitting structure.
A certain tension is applied to the thread and the thread must be
Skillfully utilize the phenomenon that a thread dropout space occurs
Thus, the area of the warp existing portion against the background is thus
By adopting a means of capturing changes, the knitting needle N- of the warp knitting machine
Whether the thread breaks between the guides G is judged
It is.

In addition, the detection method of the present invention is based on the presence of this warp.
The CCD camera 1 is used to capture the change in the area of the part.
After binarizing the imaging signal, the 1-pixel total number and
0-simply high to calculate the percentage of the total number of pixels
Since it uses a calculation method that can be processed at high speed,
Is difficult to move due to its complicated position change at high speed.
It is possible to realize the detection of thread breakage between the knitting needle N and the guide G
It was.

As described above, in the detection method of the present invention,
Optical change due to the warp pull-out space that always occurs when the yarn breaks
Is detected instantaneously, so the conventional photoelectric
Like the feeler, the influence of fly and other flying objects and the wave of the ear thread
Reliable detection without malfunction due to hitting phenomenon
It has excellent performance and is more
Instead of counting warps one by one like this,
The change in the ratio between 1-total number of pixels and 0-total number of pixels
Detects all yarn breaks within the imaging range by capturing
Since the CCD camera 1 does not
The time required to scan the width can also be greatly reduced, and thread breakage
The detection response is also greatly improved. In addition, this CC
The image pickup range of the D camera 1 can be arbitrarily set by the setter 2 according to the type of the thread row S and the like.

The warp knitting machine motor M, which has received an abnormal signal from the comparison controller 3 which has detected a yarn break, immediately stops its operation .
On the other hand, the camera controller 4 outputs a stop signal to the motor 5 that drives the carrier C. The camera controller 4 normally controls the image pickup timing of the CCD camera 1 and the driving of the motor 5 in synchronization with the knitting cycle of the warp knitting machine while receiving a tuning signal from the warp knitting machine. It is possible to arbitrarily set at which moment in the knitting cycle the image is taken, but in order to increase the accuracy of yarn breakage detection , the knitting needle N and the guide
Set the maximum imaging range by setting the moment G
It is preferable to take it tightly.

[0021]

As described above with reference to the embodiments , the yarn breakage detecting method and its detecting device according to the present invention are provided.
The yarn breakage between the knitting needle and guide of the knitting mechanism of the warp knitting machine.
The phenomenon that the space where the warp is pulled out always occurs when it occurs
The optical conversion of the surface of the thread
Breakage that determines whether or not there is a breakage
Adopts a detection means, and yet captures the optical change of this thread row
In this case, the image pickup signal of the CCD camera is binarized.
Part 1-Calculate the ratio of the total number of pixels to the total number of 0-pixels
By adopting a simple calculation method that can process at high speed
As many warp yarns stop at high speed
Without crossing or skewing, you can duplicate in the depth direction.
Since the position changes coarsely, despite the high rate of yarn breakage,
Instead, place it between the knitting needle and the guide, which was previously impossible.
It was possible to realize thread breakage detection. Therefore, the thread
It is possible to reduce the number of defective pieces due to breakage,
Every year, expensive products are being knitted due to the increasing complexity of the used yarn and structure.
For the warp knitting industry that has been established, the utility value of the present invention is extremely high.
There is something expensive.

In addition, in the detection method and apparatus of the present invention,
Is an optical feature due to the warp pull-out space that always occurs when the yarn breaks.
Since the change is detected instantaneously, the conventional light
The influence of fly and other flying objects such as electric feelers and ear thread
The detection signal is
It has excellent reliability, and it is
Instead of counting warps one by one like this,
Capture the change in the ratio of total number of pixels to 0-total number of pixels
By this, the presence or absence of thread breakage within the imaging range can be detected at once
The CCD camera runs the entire width of the thread line.
The time required for inspection can be greatly reduced, and thread breakage detection
Answerability can be greatly improved.

[Brief description of drawings]

FIG. 1 illustrates the overall configuration of a yarn breakage detection device according to this embodiment .
It is a schematic side view.

FIG. 2 is a schematic front view illustrating the overall configuration of the detection device .

FIG. 3 is a block diagram illustrating a yarn breakage detection method of the detection device .

FIG. 4 is a diagram showing a CCD camera 1 of the detection device, which has a knitting needle N and a guide.
Between the knitting needle N and the guide G at the moment when the de G is separated.
Image of required area of existing thread row S (normal state)
It is a schematic explanatory drawing which shows .

FIG. 5: The CCD camera 1 of the detection device has a knitting needle N and a guide.
Between the knitting needle N and the guide G at the moment when the de G is separated.
Image of required area of existing thread row S (thread breakage)
State) is a schematic explanatory view showing a.

[Explanation of symbols]

 1 CCD camera 2 setting device 3 comparison controller 4 camera controller C carrier G guide L light source R rail S thread row N knitting needle

Claims (2)

[Claims] 1. A number of yarns are arranged in parallel or in a skewed state.
In detecting the yarn breakage of the yarn row S before knitting, the knitting needle N and the guide G are separated from each other in the knitting cycle of the warp knitting machine.
Exists between the knitting needle N and the guide G at the moment when
A rail in which a thread row S is arranged in the width direction of the thread row S.
With the CCD camera 1 that reciprocates on the R
Along the width direction is imaged by the required range of image the image signal of the imaging range output from the CCD camera 1
Binary processing is performed for each pixel, and 1-pixel of this imaging range
Calculate the ratio between the total number and the total number of 0-pixels as the current thread value
Then, the current yarn value is set to the imaging range previously input to the setting device 2.
It can be compared with the thread normal value corresponding to the state of no surrounding thread breakage.
The presence or absence of thread breakage of the thread train S is determined by
A yarn breakage detection method for a warp knitting machine, comprising : 2. A number of yarns are arranged in parallel or in a skewed state.
With a thread breakage detection device that detects thread breakage of the thread train S before knitting
And a carrier C that reciprocates on a rail R that is arranged across the width direction of the yarn row S ; and a carrier C that is installed on this carrier C and is used for the knitting cycle of the warp knitting machine.
Of which, the knitting needle N and the guide G are separated at the moment
The width of the thread train S existing between the needle N and the guide G is
CCD camera 1 capable of picking up the required range along the direction
Installed on the same carrier C, the imaging range of CCD camera 1
A light source L for illuminating the yarn train S of the above; and the CCD camera in synchronization with the knitting cycle of the warp knitting machine.
Controls the imaging timing of 1 and the reciprocating movement of carrier C
A camera controller 4 for setting a setter 2 for outputting a value corresponding to a state in which there is no yarn breakage of the yarn row S in the image pickup range of the CCD camera 1 as a yarn normal value.
And; the image pickup signal of the image pickup range output by the CCD camera 1 is displayed.
Binary processing is performed for each pixel, and 1-pixel of this imaging range
Calculate the ratio between the total number and the total number of 0-pixels as the current thread value
And the current thread value is output from the setting device 2.
The thread breakage of the thread row S is determined by comparing it with the normal thread value.
A yarn breakage detection device for a warp knitting machine, comprising : a comparison controller 3 for judging nothing .