JPS63275779A - Yarn breakage detecting method and apparatus in knitted structure - 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] Purpose of the Invention (Field of Industrial Application) The present invention relates to a thread breakage detection method and device for a braiding machine that forms a reinforcing body for a hose using braiding methods such as braiding and spiral braiding. It is.

(Prior art) Conventionally, as this type of thread breakage detection method, a plurality of threads are caused to revolve around a predetermined axis and each group is led out in the direction of the coaxial center, and a hose guided out along the coaxial center is used. In the above braiding machine for braiding each group with each other, a contact element is engaged with the yarn on the running path of each group to apply tension of the yarn to the contact element,
There is a contact type detection method that detects the presence or absence of yarn breakage in each group by detecting the presence or absence of tension.

(Problems to be Solved by the Invention) However, in the conventional contact-type detection method described above, a contact is engaged with each group, so when the thread and the contact are revolved around the axis, , a circular force acts on each group and each contact, and the circular force causes variations in thread tension and malfunctions of the contacts. As a result, there have been problems in that variations occur in the knitted shape of the yarns and that the accuracy in detecting yarn breakage decreases.

In addition, separate contacts had to be provided for each base, and there was a problem in that the assembly of these contacts and the assembly of lead wires for taking out signals from the contacts were complicated. .

The present invention has been made in view of the above-mentioned circumstances, and is a braiding machine that does not affect the shape of the braided yarn, improves detection accuracy, and simplifies the configuration for detecting yarn breakage. The purpose of this invention is to provide a thread breakage detection method and device.

Structure of the Invention (Means for Solving the Problems) In order to achieve the above object, the first invention provides a first invention in which a predetermined axis is led out in the direction of the coaxial center while revolving around a predetermined axis, and The number of threads passing through a predetermined point within a predetermined revolution cycle of multiple threads to be braided together is counted, and the number of threads passing through is compared with a preset number of threads, and if the number of threads passing and the number of threads that are set do not match, thread breakage is detected. The gist of the present invention is to provide a thread breakage detection method that detects that

The second invention also includes a period detecting means for detecting the rotation period of the bobbin support, and a period detecting means arranged near the revolution locus of the thread led out from each bobbin and revolving around the axis together with the bobbin, and a thread detection means for detecting passage of the thread; a thread number counting means for counting the number of threads detected by the thread detection means;
Comparison of the counted number of threads counted within a predetermined rotation period of the bobbin support based on the thread number counting means and a preset set number of threads, and generates an abnormal signal if the counted number of threads and the set number of threads do not match. The gist is a thread breakage detection device provided with means.

(Function) In the first invention, when a plurality of threads are led out in the coaxial direction while revolving around a predetermined axis and are braided together on the axis, within a predetermined revolution period of the threads, ,
Based on the revolution, the number of threads passing through a predetermined point is counted, and the number of threads passing through is compared with a preset number. Then, when a thread breakage occurs and the number of passing threads decreases, the number of passing threads and the set number of threads do not match, and a thread breakage is detected.

In the second invention, the rotation period of the bobbin support is detected by the period detection means, the threads passing near the thread detection means are detected by the thread detection means, and the number of detected threads is counted by the thread number counting means. Ru.

Then, within a predetermined rotation period, the counted number of threads counted by the thread number counting means and the preset number of threads are compared by the comparing means. At this time, if thread breakage occurs and the counted number of threads within a predetermined rotation period decreases, the counted number of threads and the set number of threads do not match, and the comparison means generates an abnormal signal.

(Embodiment) Hereinafter, an embodiment embodying the present invention will be described in detail with reference to FIGS. 1 to 6.

As shown in FIGS. 1 and 2, a head 2 for leading out a molded hose is provided on the front surface of the base 1 to protrude forward, and two bobbin supports 3, large and small, each having a disk shape, 4 are rotatably supported around the axis of the head 2. Both bobbin supports 3.4 are then rotated in mutually different directions.

Twelve bobbins 6 each having a polyester thread 5 wound thereon are arranged at equal angular intervals on the outer periphery of the front side of both bobbin supports 3.4.

Each bobbin 6 is revolved around the axis based on the rotation of the bobbin support 3.4, and each prefecture 5 led out from each bobbin 6 in the axial direction is centered around the axis. It revolves around Further, each branch 5 that has been led out is crossed and braided on the outer peripheral surface of a hose (not shown) that has been led out along the axis to form a reinforcing body for the hose.

Proximity switches 7.8 as period detection means for detecting one rotation period of the bobbin supports 3.4 are respectively disposed in the vicinity of the bobbin supports 3.4 on the base 1.

In addition, near the revolution locus of the thread 5 which is led out from each bobbin 6 and revolves around the axis together with the bobbin 6,
Yarn sensor 9 as yarn number detection means for detecting passage of yarn 5
, 10 are disposed via arms (not shown) projecting from the head 2 and the base 1. As shown in Figure 3,
A plurality of light emitting fibers 11 and light receiving fibers 12 are arranged alternately on the surface of the thread sensor 9.10 facing the thread 5. When the thread 5 passes near the thread sensor 9.10, the light emitted from the light emitting fiber 11 is reflected by the thread 5, and the reflected light enters the light receiving fiber 12, preventing the thread 5 from passing. It is now detected.

Next, the electrical configuration of the thread breakage detection device will be explained based on FIG. 4.

The thread breakage detection device includes an electric circuit that detects breakage of the thread 5 drawn out from each bobbin 6 of the bobbin support 3 and a thread breakage of the thread 5 led out from each bobbin 6 of the bobbin support 4. Both electric circuits have the same electrical configuration. Therefore, for convenience of explanation, only the electric circuit for detecting thread breakage on the bobbin support 3 side will be described.

The thread sensor 9 is connected to a thread counter 13 serving as thread number counting means for counting the number of threads detected by the similar sensor 9. The thread counter 13 counts the number of threads X counted within one rotation period of the bobbin support 3 based on the thread sensor 9.
Compare n with a preset number of threads Xo and determine the number of threads Xn.

It is connected to a matching circuit 14 as comparison means that generates an abnormal signal when the XOs do not match. Also, the coincidence circuit 14
A thread number setting switch 15 is connected to the thread number setting switch 15 for setting the set thread number XO (in this case, since the number of bobbins 6 provided on the bobbin support 3 is 12, it is set to 12).

The matching circuit 14 is provided with two output terminals A and B, and one terminal A is connected to an input terminal S (set) of a Frisopfronf (F/F) 160. The other terminal B is connected to the input terminal R (reset) of the F/F 16 via an AND circuit 17. Then, in the matching circuit 14, the counted number of threads Xn detected by the thread sensor 9 and counted by the thread counter 13 is compared with the set number of threads Xo. If the numbers of threads Xn and Xo do not match, an abnormality signal is output from terminal B of the matching circuit 14. Further, when the numbers of threads Xn and Xo match, a normal signal is output from the terminal A of the matching circuit 14.

Each output terminal of the F/F 16 is connected to an abnormality occurrence counter 18 consisting of a shift register that counts the number of occurrences of the abnormal signal. The abnormality occurrence counter 18 also has an abnormality occurrence number setting switch 19 consisting of a dip switch.
It is connected to the alarm device 2° via. When the continuous count value Yn by the abnormality occurrence counter 18 exceeds the set value Yo (in this case 3) by the abnormality occurrence number setting switch 19, the switch 19 outputs a signal to the alarm device 20 and causes the alarm device 20 to sound. It looks like this.

Further, the proximity switch 7 is connected to the thread counter 13 and the abnormality occurrence counter 18, and is also connected to the terminal R of the F/F 16 via the AND circuit 17, and receives one period signal based on the rotation of the bobbin support 3. It is output as a synchronizing signal for resetting the counters 13 and 1B and counting the number of abnormal signals generated.

Next, the operation of the thread breakage detection device constructed as described above will be explained with reference to Fig. 5.6.

Now, when the power (not shown) is turned on, the hose is led out from the head 2, and the bobbin supports 3, 4 are rotated. As a result, each bobbin 6 and the yarn 5 drawn out from the bobbin 6 revolve around the spatula 2, and are braided together on the hose drawn out from the head 2 to form a hose reinforcement. . Further, the proximity switch 7.8 is operated based on one rotation of the bobbin supports 3 and 4, and as shown in FIG. 6, a one-period signal consisting of pulses of a predetermined width is outputted from the proximity switch 7.8. .

Also, based on the revolution of each prefecture 5, those threads 5 are connected to the thread sensor 9°10.
When passing near the trigger, as shown in Figure 6,
A yarn detection signal consisting of pulses is output.

Now, at the falling edge of the first one-cycle signal from the proximity switch 7 at time t1, the thread counter 13
is reset for initialization, and counts the number of yarns 5 passing through the yarn sensor 9 until the next rise of the synchronization signal.

If no thread breakage occurs, as shown in FIG. 6, in response to the rise of the - periodic signal, the counted number of threads Xn of the number of detected threads counted by the thread counter 13 based on the thread detection signal is matched. The matching circuit 14 compares the counted thread number Xn with a set thread number XO preset by the thread number setting switch 15. In this case, since there is no yarn breakage, the period from the rise to the fall of the periodic signal, that is, the time t2. A normal signal is output from terminal A of the coincidence circuit 14 during t3. At this time, the output of terminal Q of F/F16 remains at low level and is not inverted.
In the low level output state, the abnormality occurrence counter 18 is reset in response to the fall of the -periodic signal. Also, at this time, the yarn counter 13 is reset in response to the falling edge of the -o-3 period signal and performs new counting again.

When one thread breaks, time t3 in FIG.
As shown between t5 and t5, one trigger pulse of the yarn detection signal is missing between the pulses of the -periodic signal. Therefore, the counted number of threads Xn counted by the thread counter 13 decreases (Xn=11), and in response to the rising edge of the -periodic signal, the matching circuit 14 compares both numbers of threads Xn and Xo, and both numbers of threads Xn.

Xo is determined to be inconsistent. At this time, the period from the rise to the fall of the -periodic signal, that is, the time t4. During t5, an abnormal signal is output from terminal B of the coincidence circuit 14, and AN
A signal is input to the terminal R of the F/F 16 via the D circuit 17.

Then, as shown in FIG. 6, in response to this abnormal signal, the output of the terminal C of the F/F 16 is inverted from low level to high level, and in response to the fall of the - periodic signal, the output of the abnormal occurrence counter 18 is inverted. The shift output SO becomes high level. As a result, the number of occurrences of abnormal signals in the abnormality occurrence counter 18 is incremented by one, and the count value Yn becomes one.

Further, in response to the fall of this - periodic signal, the thread counter 13 is reset and restarts counting.

Thereafter, as shown from time t5 to time t7 in FIG. 6, time t6. During t7, when an abnormal signal is output from the terminal B of the coincidence circuit 14 and a signal is input to the terminal R, the output of this terminal of the F/F 16 remains at a high level and is not inverted.

Therefore, in response to the fall of the - periodic signal, the high level of the shift output SO of the abnormality occurrence counter 18 is shifted to the shift output S1. As a result, the error occurrence counter 18
At , the number of abnormal signals generated is added by 1, and the count value Yn becomes 2.

Further, in response to the fall of this - periodic signal, the thread counter 13 is reset and restarts counting.

Then, between times t7 and t9, an abnormality signal is output in the same manner as described above, and in response to the fall of the -periodic signal, the high level of the shift output S1 of the abnormality occurrence counter 18 is shifted to the shift output S2. As a result, the number of abnormal signals generated in the abnormality occurrence counter 18 is incremented by 1, and the counted value Yn becomes 3, which becomes equal to the set value Yo of the abnormality occurrence number setting switch 19. As a result, the alarm output from the setting switch 19 to the alarm device 20 becomes high level, the alarm device 20 is activated, and the occurrence of thread breakage is notified.

In this embodiment, even if the thread sensor 9 detects noise or the like when the thread 5 passes and the counted number of threads Xn becomes larger than the set number of threads Xo, the matching circuit 14 outputs an abnormal signal and the abnormality signal is output. The number of occurrences is counted by an abnormality occurrence counter 18.

In addition, if the second or third output of the matching circuit 14 following the first abnormal signal output from the matching circuit 14 becomes a normal signal, the output from the terminal of the F/F 16 changes from high level to low level. The abnormality occurrence counter 18 is reset in response to the falling of the -periodic signal.

Although this embodiment has described the detection of thread breakage on the bobbin support 3 side, thread breakage detection on the bobbin support 4 side is performed in the same way.

As mentioned above, in this embodiment, the passing of each prefecture 5 is detected by the thread sensors 9 and 1o provided near the orbit of each prefecture 5, so unlike the conventional example, Engagement does not cause variations in the tension of the yarn or malfunctions of the contacts, making it possible to prevent variations in the knitted composition shape due to the yarn 5 and to improve the accuracy of yarn breakage detection.

Furthermore, in this embodiment, thread breakage is detected by one thread sensor 9.10 provided corresponding to the 12 threads 5, so unlike the conventional example, thread breakage is detected separately for each prefecture. The assembly of the provided contacts and the lead wires for taking out signals from the contacts are not complicated, and the configuration for thread detection can be simplified.

Note that this invention is not limited to the above embodiments,
For example, an alarm device may be configured to operate at the same time as the abnormal signal is generated from the matching circuit 14, or an Ill device may be configured to notify occurrence of thread breakage on the bobbin support 3 side, and an Ill device may be configured to notify occurrence of thread breakage on the bobbin support 4 side. It is also possible to change a part of the configuration without departing from the spirit of the invention, such as using a common alarm device.

Effects of the Invention As detailed above, according to the present invention, it is possible to prevent variations in thread tension due to thread breakage detection and variations in knitting composition shape due to malfunction of a contactor, and improve thread breakage detection accuracy. This has the excellent effect of simplifying the configuration for thread breakage detection.

[Brief explanation of drawings]

1 to 6 show an embodiment embodying the present invention. FIG. 1 is a partially cutaway side view of the braiding machine, FIG. 2 is a front view of the braiding machine, and FIG. 3 is a yarn sensor. 4 is a block diagram showing the electrical configuration, 5rgJ is a flowchart explaining the operation, and FIG. 6 is a time chart explaining the operation. 3.4... Bobbin support, 5... Thread, 6... Bobbin, 7.8... Proximity switch as period detection means,
9゜10... Thread sensor as thread detection means, 13...
- Thread counter as thread number counting means, 14... Matching circuit as comparison means, L... Shaft center, Xn... Counting thread number, XO... Set thread number.

Claims (1)

[Claims] 1. While revolving around a predetermined axis (L),
The number of threads (Xn) that pass through a predetermined point within a predetermined revolution period of a plurality of threads (5) that are guided in the L) direction and braided with each other on the axis (L) is counted, and the number of threads that pass (X
n) and a preset set number of threads (Xo), and if the passing number of threads (Xn) and the set number of threads (Xo) do not match, a thread breakage is detected. Yarn breakage detection method in braiding machine. 2. A bobbin support (3, 4) rotatable around a predetermined axis (L), supported by the bobbin support (3, 4), and capable of rotating the bobbin support (3, 4). and a plurality of bobbins (6) that revolve around the axis (L) based on the rotation of the bobbin support (3, 4), and a thread (5) wound around each bobbin (6) when the bobbin support (3, 4) rotates. In the braiding machine, the bobbin supports (3, 4) are guided in the direction of the axis (L) and are braided together on the coaxial center (L). ), derived from each bobbin (6), and a bobbin (6)
and thread detection means (9, 10) arranged near the orbit of the thread (5) revolving around the axis (L) and detecting passage of each thread (5); 9, 10)
Thread number counting means (13) for counting the number of threads detected by
and the bobbin support (3) based on the thread number counting means (13).
, 4) Counted number of threads (Xn) counted within the predetermined rotation period
and a comparison means (14) for comparing the number of threads and a preset number of threads (Xo) and generating an abnormal signal if the counted number of threads (Xn) and the number of set threads (Xo) do not match. Thread breakage detection device for braiding machines.