JPH0345989Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a yarn breakage detection device for a hose braiding machine.

(Prior art) In rubber hoses and the like, in order to reinforce the strength of the hose, a reinforcing layer is formed by winding reinforcing yarn around the outer circumferential surface of the hose (including intermediate molded bodies such as inner layer tubes) using a braiding machine. things will be done. This braiding machine is equipped with a hose passage section and a plurality of yarn feeding sections, and the reinforcing yarn is continuously fed out and wound around the hose while rotating the thread feeding sections around the hose. It's getting old.

However, in this braiding machine, if the braiding operation is continued even though thread breakage has occurred, the reinforcing layer will not be formed properly. Therefore, in such a braiding machine, it is necessary to monitor whether the reinforcing yarn is being normally paid out from the yarn feeding section. As such a device, there is a known device in which a thread breakage lever or the like is mechanically actuated by utilizing the slack in the thread that occurs when the thread breaks, thereby detecting thread breakage.

(Problem to be solved by the invention) However, in this device, it is necessary to provide a number of levers corresponding to the number of reinforcing yarns, and since this device mechanically detects yarn breakage, There is a problem that the configuration inevitably becomes complicated.

(Means for solving the problem) The thread breakage detection device of the present invention was devised to solve the above problem, and the gist of this is that the thread breakage detection device of the present invention The reinforcing thread is located in between and faces the rotating surface of the reinforcing thread that rotates around the hose while being let out from the thread feeding part, and the reinforcing thread is blocked from passing through the reinforcing thread based on the blocking of the optical path or the reflection of light due to the passing of the reinforcing thread. A detection optical sensor is fixedly provided, and the number of reinforcing yarns scheduled to pass per one rotation period of the yarn feeding section is compared with the number of reinforcing yarns passing through detected by the optical sensor to determine whether or not there is yarn breakage. This is due to the fact that it is detected.

(Function) In the device of the present invention, when the fed-out reinforcing thread passes in front of the optical sensor that is installed in a fixed position opposite to its rotating surface, specifically, the surface formed by the rotating locus of the reinforcing thread. , an optical sensor detects this. If the number of passing reinforcing yarns detected by this optical sensor per one rotation period of the yarn feeding section is less than the expected number of passing yarns, it means that yarn breakage has occurred.

As described above, according to the present invention, the presence or absence of yarn breakage can be detected non-contactly using a single optical sensor. Therefore, the structure of the thread breakage detection device is simple, and the presence or absence of thread breakage can be detected reliably.

(Example) Next, an example of the present invention will be described in detail based on the drawings.

In FIG. 1, 10 is a hose (intermediate molded body), and 12, 12 are rotating bodies of a braiding machine, from which reinforcing threads 28 are continuously paid out. Furthermore, these pair of rotating bodies 1
2 and 12 are rotated in opposite directions.
That is, the rotating body 12 on the right side of the figure rotates in the direction indicated by arrow A, and the rotating body 12 on the left side rotates in the direction indicated by arrow B.

As shown in FIG. 2, the braiding machine has a passage hole 14 for the hose 10 and a rotating shaft 22 supported by a support frame 20 via a bearing 18, and the rotating body 12 is fixed to the rotating shaft 22. The same rotating body 12
is adapted to be rotated together with the rotating shaft 22. A plurality of bobbins 2 are provided on the outer periphery of the rotating body 12.
6 are provided, and a plurality of reinforcing threads 28 are continuously paid out from these bobbins 26. The fed-out reinforcing thread 28 is attached to the rotating body 12
As the reinforcing thread rotates, it is wound spirally around the outer peripheral surface of the hose 10 to form a reinforcing thread layer.

As shown in FIG. 1, the braiding machine has a reflective photoelectric switch 30 that detects the passage of the reinforcing thread 28 fed out from each rotating body 12, which emits light from a floodlight, and the light is reflected by the reinforcing thread 28. By receiving the reflected light when the reinforcing thread 28
A photoelectric switch 30 is provided to detect the passage of. These photoelectric switches 30 are shown in FIGS.
Hose 10 and bobbin 2 as shown in FIG.
6, that is, the reinforcing thread 28 is fixed to the support frame 20 via a bracket 32 so as to face a rotating surface formed by the rotation locus of the reinforcing thread 28. Incidentally, arcuate guard frames 34 are attached to the support frame 20 at two upper and lower positions so as to cover the photoelectric switch 30.

The braiding machine also includes a rotating body 1 as shown in FIG.
Proximity switches 36 for detecting the number of rotations (or rotation period) of 2 are provided, and signals from these proximity switches 36 are input to a control section 38. The control unit 38 uses the signals from the proximity switch 36 and the photoelectric switch 30 to adjust the reinforcing thread 2 per rotation of the rotating body 12.
The number of passing lines of 8 is detected.

Next, the operation of the device of this example will be explained.

The number of reinforcing threads 28 set on the rotating body 12 is inputted to the control unit 38 from the input unit 40 shown in FIG. Wrap it around. At this time, the proximity switch 36 detects the rotation period of the rotating body 12 and inputs a periodic signal to the control section 38, and the photoelectric switch 30 detects passage of the reinforcing thread 28 and inputs the signal to the control section 38. The control unit 38 receives input values from the input unit 40, that is, the number of reinforcing threads 28 set, and the proximity switch 36.
and the number of passing reinforcing threads 28 per rotation of the rotating body 12 calculated based on the signal from the photoelectric switch 30, and if the number is less than the set number, it is determined that thread breakage has occurred. and outputs a thread breakage signal to external devices such as alarms and indicators. In response to this, an alarm device, display device, etc. issues an alarm or lights up a predetermined indicator light. In addition, in order to prevent malfunction, thread breakage occurs when the number of reinforcing threads 28 passing through one rotation of the rotating body 12 is less than the planned number three, four, or five times in a row. A thread breakage signal may be output as follows.

As described above, according to the detection device of this embodiment, the presence or absence of yarn breakage from the yarn feeding portion of the rotating body 12 can be detected in a non-contact manner using the photoelectric switch 30. Furthermore, since this detection device electrically detects thread breakage, it requires only a very small installation space, has a simple configuration, and can reliably detect the presence or absence of thread breakage.

Although the embodiments of the present invention have been described in detail above, the present invention can also be configured in other forms.

For example, it is possible to automatically stop the braiding machine when a thread breaks.

Further, in the above example, a reflective photoelectric switch is used as the optical sensor, but it is also possible to use a transmissive photoelectric switch as the optical sensor, and it is also possible to use other types of optical sensors as the sensor. is also possible.

In addition, although the above example uses a spiral machine that winds the reinforcing thread in a spiral, the present invention is also applicable to a braider machine that rotates the thread unwinding part around the hose while drawing a figure-8-shaped trajectory. The present invention can be configured with various modifications without departing from the spirit thereof, such as being applicable to the present invention.

(Effects of the invention) In this way, the present invention uses an optical sensor to detect the passage of the reinforcing yarn that is paid out from the yarn unwinding section, and detects the presence or absence of yarn breakage based on the signal from the optical sensor. It is something.

According to the present invention, the configuration of the detection device is simple, and the presence or absence of thread breakage can be reliably detected and necessary countermeasures can be taken, thereby properly forming the reinforcing thread layer of the hose. This results in excellent effects such as the ability to

[Brief explanation of the drawing]

FIG. 1 is a diagram conceptually showing the configuration of a yarn breakage detection device which is an embodiment of the present invention, and FIG. 2 is a diagram schematically showing the configuration of a braiding machine. 3 and 4 are a front view and a plan view, respectively, showing the photoelectric switch shown in FIGS. 1 and 2 and its surroundings. 10...Hose, 12...Rotating body, 26...Bobbin, 28...Reinforcement thread, 30...Photoelectric switch,
36...Proximity switch, 38...Control unit.

Claims (1)

[Claims for Utility Model Registration] A hose passing section and a plurality of thread letting out sections that rotate around the hose passing through the passing section and letting out yarn, and the reinforcing yarn let out from the thread letting out section is passed around the outer circumference of the hose. In a hose braiding machine that forms a reinforcing yarn layer by winding the reinforcing yarn on a surface, the reinforcing yarn is located between the outer circumferential surface of the hose and a yarn feeding section and rotates around the hose while being let out from the yarn feeding section. An optical sensor is fixedly provided facing the rotating surface and detects the passing of the reinforcing thread based on the interruption of the optical path due to the passing of the reinforcing thread or the reflection of light, and A thread breakage detection device for a hose braiding machine, characterized in that the presence or absence of thread breakage is detected by comparing the number of passing reinforcing threads detected by the optical sensor with the number of passing reinforcing threads detected by the optical sensor.