JPH0254604B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wire breakage detection device for detecting breakage of strands during stranding in the production of stranded wires, cables, and the like. (Hereinafter, in this application,
Element wires include coated wires and bare wires used for twisting, as well as wire-like intervening wires such as jute or paper strings. ) [Prior art] In the wire twisting process, if even one wire is unwound from the supply bobbins attached to the wire twisting machine, and the detection is delayed even a little, it will not only result in product defects, but also Materials would be wasted and large losses would result, so as a device for automatically detecting such breaks in strands, for example, Japanese Patent Laid-Open Publication No. 54-50639 installed iron pieces. The rotation of the supply bobbin of the stranding machine is detected by a proximity switch, and the detection signal triggers a mono-multivibrator to generate a pulse with a predetermined pulse width, and this pulse is transmitted to the ground side by wireless or wire. A device has been disclosed in which the wire twisting machine is stopped by the control device when the mono-multivibrator loses pulse output when the wire breaks.

[Problem that the invention seeks to solve]

However, in the conventional wire breakage detection device as described above, the twisting machine is stopped by detecting that the rotation of the supply bobbin stops due to a wire breakage. In addition, there is a non-negligible delay before the twisted wire machine stops, and in the case of wireless systems, various problems occur such as malfunctions caused by incoming radio waves from outside and wear of the power supply slip rings. moreover,
Since such a disconnection detection device must be installed for each supply bobbin, the amount of wiring increases.
The problem is that as the structure becomes more complex, failures are more likely to occur.

This invention was made to solve the above problems, and its purpose is to provide a wire breakage detection system with a simple structure that can quickly and reliably automatically detect wire breaks during twisting using a wire twisting machine. The goal is to provide equipment.

[Means for solving problems]

In order to solve the above-mentioned problems, the wire breakage detection device during twisting according to the present invention includes a rotation detecting section that detects the rotation of a rotating body of a wire twisting machine, and an A strand detection unit detects the passage of n strands fed out from the strand feeding units, and an output pulse from the rotation detection unit is used as a gate input, and output from the strand detection unit between each output pulse. The present invention is characterized by comprising an arithmetic device that counts the number m of pulses generated and generates a stop signal for stopping the wire twisting machine when m≦n-1.

[Effect]

In the wire breakage detection device during twisting of the present invention having the above configuration, it is assumed that there are five wire feeding parts (n=5), and when the wire is normal, that is, when there is no wire breakage, the rotation detection part Each time a pulse is generated, a total of 5 pulses (m
= n = 5) pulses are input, but if even one strand breaks, the arithmetic unit determines that it has become m4 and sends a stop signal to the control unit to stop the operation of the wire twisting machine. emits.

〔Example〕

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the device for detecting breakage of strands during twisting according to the present invention will be described in detail below with reference to the drawings. The disconnection detection device of this embodiment has a second
It is used to detect a disconnection of a jute used as a cable intervening device in a jute feeding device of a wire twisting machine as shown in the figure, and as shown in FIG. A circuit 2, a proximity switch 3 as a rotation detection section, a gate circuit 4, an inversion circuit 5, a counter 6, a reset pulse generation circuit 7, and an arithmetic circuit 8
It is equipped with an arithmetic unit 9 consisting of the following. In the illustrated wire twisting machine, five jute supply bobbins 11 ₁ , 11 ₂ , 11 ₃ , 11 ₄ , 11 ₅ are attached to the rotating body 10, and jutes 12 ₁ , 12 ₂ , 12 ₃ , 12 ₄ , 12 ₅ are rotating bodies 10
Feeding holes 13 ₁ , 13 ₂ , 13 ₃ , 1 provided in
3 ₄ and 13 ₅ in the axial direction of the twisting machine (in the paper plane direction), and are twisted together with the core wire (not shown). Further, an iron piece 14 is fixed at a predetermined position on the outer periphery of the rotating body 10, and a proximity switch is installed near the outer periphery of the rotating body 10 at a position where passage of the iron piece as the rotating body 10 rotates can be detected. 3 is installed. The photoelectric switch is fixed at a position where it can emit light toward the rotating jutes 12 ₁ to 12 ₅ and receive the reflected light to detect only the passage of the jutes. In addition, when projecting light toward the rotating body 10 in a direction parallel to the twisting axis, in order to reduce the reflected light from the rotating body 10 and accurately detect only the reflected light from the jute,
Black paint B is applied to the parts of the rotating body 10 that are exposed to light.
It is desirable to apply such.

In FIG. 1, a photoelectric switch 1 is a rotating body 10.
As the unit rotates, it receives light successively reflected from the jutes 12 ₁ to 12 ₅ and generates sequential pulses.
On the other hand, the proximity switch 3 generates one pulse every time the rotating body 10 rotates once. Therefore, if there is no disconnection in the jutes 12 ₁ to 12 ₅ , the proximity switch 3
generates one pulse, photoelectric switch 1
generates 5 pulses. The output pulse of the photoelectric switch 1 is shaped by the waveform shaping circuit 2 into a pulse having a pulse width longer than the time it takes for each of the jutes 12 ₁ to 12 ₅ to cross the projected light from the photoelectric switch 1, and is input to the gate circuit 4. Ru. The reason why the width of the pulse shaped by the waveform shaping circuit 2 is set as above is that even if two or more reflected lights are emitted from one jute, as in the case of using a paper string etc. as the jute, the width of the shaped pulse is set as above. This is because it is counted as one juite. In addition, when projecting light in a direction perpendicular to the twisting axis, not only the reflected light from the jute but also the reflected light from the coated core that is being twisted at the same time inside the jute is detected, so the coated wire that can be detected The sum of the number of hearts (for example, three) (eight) may be set as n.

On the other hand, the output pulse of the proximity switch 3 is inverted by the inverting circuit 5 and input to the gate circuit 4 as a control signal. That is, as shown in FIG. 3, the gate circuit 4 allows only the output pulse of the photoelectric switch 1, which is input between two successive output pulses of the proximity switch 3, to be input to the counter 6. Note that FIGS. 3a, 3b, and 3c show the output of the proximity switch 3, the output of the inverting circuit 5, and the output of the waveform shaping circuit 2, respectively. Reset pulse generation circuit 7
generates a reset pulse synchronized with the output pulse of the proximity switch 3 and supplies it to the counter 6 and the arithmetic circuit 8 (FIG. 3d).

The counter 6 counts the output pulses of the photoelectric switch 1 while being reset by the trailing edge of the reset pulse each time the rotating body 10 rotates. Further, the arithmetic circuit 8 reads the content m of the counter 6 in synchronization with the leading edge of the reset pulse, and calculates mn-1 (=4) for a predetermined set value n (n=5 in this embodiment).
Determine whether or not. If m=n (=5), as in period _{t 1 in} FIG. When the number m of output pulses of 1 becomes mn-1 (=4),
Generate a stop signal to immediately stop the stranding machine. Note that the phase difference θ between the leading edge of the output pulse of the proximity switch 3 and the leading edge of the output pulse of the first photoelectric switch 1 after reset is such that the distance between the photoelectric switch 1 and the proximity switch 3 with respect to the center of the rotating body 10 is It can be set to an appropriate value by adjusting the angle formed.

In the above embodiment, the case where the JUT supply bobbin is attached to only one side of the rotating body 10 has been described. However, if the supply bobbin is installed on both sides of the rotating body 10, a disconnection detection device similar to the above is installed on the back side as well. It is of course possible to stop the stranding machine by mounting and ORing the stop signals from both detection devices.
Furthermore, it is obvious that the present invention can be applied not only to the detection of disconnection of wires such as bare wires or covered wires, but also to the detection of wire breaks. Furthermore, as the photoelectric switch, not only a reflective type but also a transmissive type can be used.

〔Effect of the invention〕

According to this invention, a device with a relatively simple structure can quickly and reliably detect a break in the strands being twisted by a wire twisting machine, automatically stop the wire twisting machine, and eliminate defective products. generation and material loss can be minimized.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of a device for detecting wire breakage during twisting according to the present invention, and FIG. 2 is a schematic front view of an example of a jute supply device for a wire twisting machine used in conjunction with this embodiment. 3a, b, c and d are timing diagrams for explaining the operation of the above embodiment. 1... Photoelectric switch (wire detection section), 2... Waveform shaping circuit, 3... Proximity switch (rotation detection section),
4...Gate circuit, 6...Counter, 8...Arithmetic circuit, 9...Arithmetic device, ₁₂₁ to ₁₂₅ ...Jute (wire).

Claims (1)

[Claims] 1. A rotation detection unit that detects the rotation of a rotating body of a wire twisting machine, and a rotation detection unit that detects the passage of n strands fed out from n strand feeding units attached to the rotating body. Using the output pulses of the strand detection section and the rotation detection section as gate inputs, count the number m of pulses output from the strand detection section between these output pulses, and calculate m
1. An apparatus for detecting wire breakage during twisting, comprising: an arithmetic unit that generates a stop signal for stopping a wire twisting machine when ≦n-1. 2. A photoelectric switch in which the strand detection section detects passage of the strand, and a waveform shaping circuit that shapes the output pulse of the photoelectric switch into a pulse having a pulse width longer than the time it takes for the strand to cross the projected light from the photoelectric switch. The device for detecting disconnection of strands during twisting according to claim 1.