JPH043465B2 - - Google Patents

Description

A yarn breakage detection device for a braiding machine, characterized in that it is provided with comparison means 14 that generates an abnormal signal in case of mismatch.

[Detailed description of the invention]

(Industrial Application Field) This invention is a braiding method such as braiding or spiral knitting, in which a reinforcing braided body is braided around the outer periphery of a pressure fluid supply hose or electric wire. This invention relates to a yarn breakage detection method and device.

(Prior Art) Conventionally, as a yarn breakage detection method and device for this type of braiding machine, a plurality of yarns are caused to revolve around a predetermined axis and each yarn is guided in the direction of the coaxial center, and
In a braiding machine that braids yarns together on a hose led out along a coaxial center, a contactor (freeler) is engaged with the yarn on the running path of each yarn to apply yarn tension to the contactor. There was one in which the presence or absence of thread breakage in each thread was detected by detecting the presence or absence of tension.

(Problem to be Solved by the Invention) However, in the above-mentioned conventional technology, each thread is engaged with a contactor, so when the thread and the contactor revolve around the axis, each thread Also, centrifugal force acts on each contact, and the centrifugal force causes variations in the tension of the threads 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 of yarn breakage detection is reduced.

In addition, separate contacts must be provided for each thread, complicating the assembly of those contacts and lead wires for extracting signals from the contacts. Ta.

The present invention has been made in view of the above-mentioned circumstances, and is capable of improving detection accuracy and simplifying the configuration for detecting yarn breakage without affecting the knitting shape of the yarn. The purpose of this invention is to provide a break detection method and device.

Structure of the Invention (Means for Solving Problems) In order to achieve the above object, the first invention rotates the bobbin support body around a predetermined axis and guides it out in the direction of the coaxial center. The number of threads passing through a predetermined fixed point per rotation period of the plurality of threads to be braided together is counted, and the number of threads passing through is compared with a preset number of threads set in advance, and if the numbers do not match, it is determined that the thread is broken. It is designed to be detected.
A second invention also provides a bobbin support that is rotatable around a predetermined axis, and a plurality of bobbin supports that are supported by the bobbin support and rotate around the axis based on the rotation of the bobbin support. A braiding machine comprising a bobbin and a thread wound around each bobbin is guided out in the direction of the axis when the bobbin support rotates, and the threads are braided together on the same axis, the rotation period of the bobbin support being a cycle detection means for detecting the threads; and a thread detection means arranged near the rotation trajectory of the threads derived from the respective bobbins and rotated around the axis, and detecting passage of each thread for each rotation period. ,
A thread number counting means for counting the number of threads detected by the thread detection means, and a number of threads counted within one rotation period of the bobbin support based on the thread number counting means are compared with a preset number of threads. This configuration employs a configuration consisting of comparison means that generates an abnormal signal in the case of a discrepancy.

(Function) In the first invention, when a plurality of threads are led out in the coaxial direction while rotating around a predetermined axis and are braided together on the axis, within a predetermined rotation period of the threads, , based on the rotation, counts the number of threads passing through a predetermined point, and compares the number of threads passing 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 one 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,
When 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 L of the head 2. Both bobbin supports 3 and 4 are rotatable 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 and 4. Each bobbin 6 is revolved around the axis L based on the rotation of the bobbin supports 3 and 4, and each thread 5 led out from each bobbin 6 in the direction of the axis L is centered around the axis L. Rotate to. Further, each of the threads 5 drawn out are crossed and braided on the outer circumferential surface of a hose (not shown) drawn out along the axis L to form a reinforcing body of the hose.

In the base 1, near both the bobbin supports 3 and 4, there is a proximity switch 7 as a period detection means for detecting one rotation period of the bobbin supports 3 and 4.
8 are arranged respectively.

In addition, near the orbit of the thread 5 which is led out from each bobbin 6 and revolves around the axis L together with the bobbin 6, there are thread sensors 9 and 10 as thread number detection means for detecting the passage of the thread 5. It is disposed via an arm (not shown) protruding from the head 2 and the base 1. As shown in FIG. 3, a plurality of light emitting fibers 11 and light receiving fibers 12 are arranged alternately on the opposing surfaces of the thread 5 of the thread sensors 9 and 10. When the thread 5 passes near the thread sensors 9 and 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, thereby preventing the thread 5 from passing. It is becoming 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 as a thread number counting means for counting the number of threads detected by the same thread sensor 9. The thread counter 13 is
The counted number of threads Xn counted within one rotation period of the bobbin support 3 based on the thread sensor 9 is compared with the preset number of threads Xo, and the number of threads Xn, Xo is determined.
It is connected to a coincidence circuit 14 as a comparison means that generates an abnormal signal when the signals do not match. In addition, the set thread number Xo is set in the coincidence circuit 14 (in this case,
Since the number of bobbins 6 provided on the bobbin support 3 is 12, a thread number setting switch 15 is connected to set the number to 12.

The matching circuit 14 is provided with two output terminals A and B, one of which is connected to an input terminal S (set) of a flip-flop (F/F) 16. 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 thread sensor 9 detects the thread counter 13.
The counted number of threads Xn counted by is compared with the set number of threads Xo. If the thread numbers 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 terminal A of the matching circuit 14.

The 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. Further, the abnormality occurrence counter 18 is connected to the alarm device 20 via an abnormality occurrence number setting switch 19 consisting of a dip switch.
It is connected to the. Then, the abnormality occurrence counter 1
When the continuous count value Yn from 8 exceeds the set value Yo (3 in this case) 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. .

Further, the proximity switch 7 is connected to the thread counter 13 and the abnormality occurrence counter 18, and also connected to the AND
It is connected to the terminal R of the F/F 16 via the circuit 17, and outputs a one-period signal based on the rotation of the bobbin support 3 as a synchronization signal for resetting both counters 13 and 18 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 FIGS. 5 and 6.

Now, when the power (not shown) is turned on, the hose is led out from the head 2, and the bobbin supports 3 and 4 are rotated. As a result, each bobbin 6 and the thread 5 led out from the bobbin 6 are rotated around the head 2, and are braided together on the hose led out from the head 2 to form a hose reinforcement. Also, bobbin supports 3, 4
The neighboring switches 7, 8 are operated based on one rotation of the switch 7, and as shown in FIG. Further, when each thread 5 passes near the thread sensors 9 and 10 based on the rotation of each thread 5, a thread detection signal consisting of a trigger pulse is outputted as shown in FIG.

Now, the neighboring switch 7 at time t1
At the falling edge of the first period signal from
The thread counter 13 is reset for initialization, and the thread sensor 9 remains active until the next rising edge of the synchronization signal.
Count the number of threads 5 passing through.

If no thread breakage occurs, as shown in FIG. 6, in response to the rising edge of the one-cycle signal, the counted thread count 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 the set thread number Xo preset by the thread number setting switch 15. In this case, since there is no thread breakage, the coincidence circuit 1
A normal signal is output from terminal A of 4. At this time,
The output of the terminal of the F/F 16 remains at a low level and is not inverted, and the abnormality occurrence counter 18 is reset in response to the fall of the one-cycle signal in the low level output state. Also, at this time, in response to the falling edge of this one-cycle signal, the thread counter 13 is reset and performs new counting again.

When one thread breaks, one trigger pulse of the thread detection signal is missing between the pulses of the one-period signal, as shown from time t3 to time t5 in FIG. Therefore, the counted number of threads Xn counted by the thread counter 13 decreases (Xn = 11), and in response to the rise of the one-cycle signal, the coincidence circuit 14 compares the numbers of threads Xn and Xo, and the numbers of threads Xn and Xo are It is determined that there is a mismatch. At this time, the period from the rise to the fall of the one-cycle signal, that is, the time t4,
During t5, an abnormal signal is output from terminal B of the matching circuit 14, and the signal is input to terminal R of the F/F 16 via the AND circuit 17.

Then, as shown in FIG. 6, in response to this abnormal signal, the output of the terminal of the F/F 16 is inverted from low level to high level, and in response to the falling edge of the one-cycle signal, the output of the abnormality occurrence counter 18 is shifted. S0 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 one-cycle signal, the thread counter 13 is reset and restarts counting.

Thereafter, as shown between times t5 and t7 in FIG. 6, an abnormal signal is output from terminal B of the matching circuit 14 between times t6 and t7, and a signal is input to terminal R, as described above. The output of the /F16 terminal remains at a high level and is not inverted.
Therefore, in response to the fall of the one-cycle signal, the high level of the shift output S0 of the abnormality occurrence counter 18 is shifted to the shift output S1. As a result, the number of abnormal signals generated in the abnormality occurrence counter 18 is incremented by one, and the count value Yn becomes two.

Further, in response to the fall of this one-cycle 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 one-cycle 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 etc. when the thread 5 passes and the counted number of threads Xn becomes larger than the set number of threads Xo, the coincidence circuit 14
An abnormality signal is output from the abnormality signal, and the number of occurrences thereof is counted by an abnormality occurrence counter 18.

Further, the coincidence circuit 1 at the second or third time following the first abnormal signal output from the coincidence circuit 14
If the output of F/F1 becomes a normal signal,
The output of the terminal 6 is inverted from high level to low level, and the abnormality occurrence counter 18 is reset in response to the fall of the one-cycle 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. Further, in the above embodiment, the case where the thread 5 was cut during work was described, but
Even when the thread 5 wound around the bobbin 6 runs out, it can be detected in the same manner as described above.

As described above, in this embodiment, each yarn 5 is
Since the passage of the thread 5 is detected, unlike the conventional example, there is no variation in the tension of the thread due to engagement with the contactor, there is no malfunction of the contactor, and the knitting shape by the thread 5 is not affected. It is possible to prevent variations in thread breakage and improve thread breakage detection accuracy.

Moreover, 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 corresponding to each thread. The structure for thread detection can be simplified without complicating the assembly of the provided contacts and the lead wires for taking out signals from the contacts.

It should be noted that the present invention is not limited to the above-mentioned embodiments. For example, the present invention may be configured to operate an alarm device at the same time as an abnormal signal is generated from the matching circuit 14, or to notify occurrence of thread breakage on the bobbin support 3 side. It is also possible to implement the invention by partially changing the configuration without departing from the spirit of the invention, such as by using a common alarm device for notifying thread breakage on the bobbin support 4 side.

Effects of the Invention As detailed above, according to the first invention, the number of threads passing within one rotation period is detected, and this detection result is compared with a preset number of threads,
Since thread breakage is reliably detected when these do not match, skipped stitches due to thread breakage do not occur and the quality of the braided product does not deteriorate.

Further, in the second invention, since the number of threads is detected by an optical detection means, the detection accuracy is accurate;
This has excellent effects in that it is possible to prevent variations in thread tension due to centrifugal force acting on the thread, unlike conventional devices using contacts, and it is also possible to simplify the configuration for detecting thread breakage.

[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, FIG. 5 is a flowchart explaining the operation, and FIG. 6 is a time chart explaining the operation. 3, 4... Bobbin support, 5... Yarn, 6... Bobbin, 7, 8... Proximity switch as period detection means, 9, 10... Thread sensor as thread detection means, 13... Thread number counting Thread counter as a means,
14... Matching circuit as comparison means, L... Shaft center, Xn... Number of counted threads, Xo... Number of set threads.

Claims (1)

[Scope of Claims] 1. While rotating the bobbin support around a predetermined axis L, a plurality of threads 5 are guided in the direction of the same axis L and braided together on the axis L for each rotation period. Count the number of trains passing through a predetermined fixed point Xn, and calculate the number of passing trains
A method for detecting thread breakage in a braiding machine, characterized in that Xn is compared with a preset number of threads Xn, and if they do not match, a thread breakage is detected. 2. bobbin supports 3, 4 rotatable around a predetermined axis L; supported by the bobbin supports 3, 4;
A plurality of bobbins 6 rotate around the axis L based on the rotation of the bobbin supports 3 and 4, and when the bobbin supports 3 and 4 rotate, the thread 5 wound around each bobbin is A braiding machine that guides the wires in the direction of the center L and braids them together on the coaxial center L, including: period detecting means 7, 8 for detecting the rotation period of the bobbin supports 3, 4; with bobbin 6
Yarn detection means 9, 10 are arranged near the rotation locus of the yarn 5 rotated about the axis L, and detect the passage of each yarn 5 every rotation period, and the yarn detection means 9, 10 a thread number counting means 13 for counting the detected number of threads, and a counted number of threads Xn counted within one rotation period of the bobbin supports 3 and 4 based on the thread number counting means 13;
Compare this with the preset number of threads Xo.