JPH0480132B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Technical Field> The present invention relates to a method for stopping a loom using a warp breakage detection device that detects warp breakage (and loosening).

<Prior Art> A conventional example of a warp break detection device for a loom and a stopping device for a loom using the same is shown in FIGS. 1 and 2.

First, to explain the loom, the warp threads 2 wound around the warp beam 1 are pulled out and passed through the cross rollers 3 and guide bars 4, 5, 6, and then opened and closed by the healds 7 to move the weaving threads in front of it. Front 8
A warp opening is formed between the two. Then, the weft threads (not shown) inserted into the warp opening by the main nozzle (not shown) are reeded toward the fabric front 8 by the reed 9, and the woven fabric 10 is woven. Woven fabric 10
, the breast beam 11 and the weaving density adjustment mechanism 12
The film is wound onto the winding roller 13 via the winding roller 13.

Also, to explain about the warp breakage detection device,
A detection bar 14 is provided above the warp threads 2 between the guide bars 4 and 5 and spanned between frames (not shown) on both sides of the loom. Long holes 15a of droppers 15 made of conductive plates of the same number as the number of warp threads 2 are loosely fitted into the detection bar 14, and the lower forked portion of each dropper 15 is supported by the warp threads 2. Further, the detection bar 14 includes a cathode 16 having a U-shaped cross section whose outer wall portion is always in contact with the dropper 15, and a plate-shaped anode 18 held between the cathode 16 via an insulator 17. This cathode 16 is grounded, and the anode 18 is connected to the anode of a power source 19.

Then, when the warp threads 2 are cut, the dropper 15
falls under its own weight, and a long hole 15 is formed at the upper end of the anode 18.
When the upper wall of a contacts the anode 18, the dropper 15
is electrically connected to the cathode 16 through the a
The potential at the point decreases. This allows warp breakage and loosening to be detected. As the potential at point a decreases, the base voltage of the transistor 20 decreases, and the transistor 20 becomes conductive. Therefore, the transistor 20, the power supply 21 and the coil 22 of the normally open relay 22
A current flows through the series circuit consisting of the coil 22
a is excited, and relay contact 22b is closed. As a result, current flows through the loom stop circuit 23 connected in series to the relay contact 22b, the loom stop circuit 23 is activated, and the loom is stopped based on the signal from this circuit 23.

Here, a warp yarn breakage detection device is constituted by a circuit consisting of a dropper 15, a cathode 16, an anode 18, and a power source 19, and the transistor 20, relay 22
The loom stop circuit 23 constitutes a loom stop device.

However, in this conventional method of stopping a loom using a warp breakage detection device, the loom is stopped once the dropper 15 falls, so the warp loosens in a short period of time and naturally returns to normal tension. Even when the warp threads are loosened, the threads become loose.
5 falls and the loom stops. In this way, if the loom stops when the tension of the warp threads naturally returns to normal and the quality of the woven fabric is not affected, a problem arises from the viewpoint of improving the production of the woven fabric. Particularly, in fragment looms, the tension of the warp yarns at the edges of the warp rows decreases and returns naturally due to the tightness of the selvedges of the woven fabric, which causes the above-mentioned problem.

<Purpose of the Invention> In view of these conventional problems, the present invention improves productivity by allowing the loom to continue operating without stopping when the warp threads are loose so that the warp tension naturally returns to normal. While aiming at improvement, the loom is stopped when the warp threads are cut or the warp threads become loose over a long period of time.

<Configuration of the Invention> For this reason, in the present invention, a capacitor is connected in parallel to the cathode and anode of the warp breakage detection device, and the signal from the warp breakage detection device is transmitted continuously for a predetermined period of time and multiple times within a predetermined period of time. This is designed to stop the loom when an input is received.

<Example> The present invention will be described below based on an example shown in FIGS. 3 and 4A and 4B. Note that the same elements as in the conventional example are given the same reference numerals as in FIGS. 1 and 2, and different parts will be explained.

In Figure 3, power supply 1 connected in the same way as before
A resistor 30 is interposed between the anode 9 and the anode 18. Further, a first capacitor 31 is provided in parallel with the anode 18 and the cathode 16, and when the dropper 15 falls and approaches the anode 18 after the capacitor 31 is charged during operation of the loom, the capacitor 31 is discharged between them. This phenomenon occurs, and this discharge phenomenon blows away the fluff accumulated on the anode 18, thereby eliminating poor contact between the anode 18 and the dropper 15, and making it possible to accurately detect warp breakage.

Then, the potentials of the resistor 30 and the capacitor 31 are input to the delay circuit 32 and the first NOT circuit 33, and the signal of the delay circuit 32 is input to one input terminal of the NAND circuit 34, and the first NOT circuit 33 is input to one input terminal of the AND circuit 35. The output signal of the NAND circuit 34 is input to the second NOT circuit 36 and the other input terminal of the AND circuit 35. Here, the delay time T ₁ in the delay circuit 32 is input to the NAND circuit 34 when instantaneous loosening of the warp threads occurs. It is set so that the "L" signal and the "H" signal from the NOT circuit 33 do not overlap.

One end of a capacitor 38 is connected to the anode of the power source 19 via a resistor 37.
The other end of 8 is connected to the output terminal of the second NOT circuit 36. And the second NOT circuit 3
When an "H" signal is input to 6, the other end of the capacitor 38 is grounded and charging of the capacitor 38 is started, and when an "L" signal is input, the capacitor 38 is naturally discharged. Also, resistor 37 and capacitor 38
A potential between the two is input to the other input terminal of the NAND circuit 34.

Here, the time constant determined by the resistor 30 and the capacitor 31 is set sufficiently small so that the capacitor 31 is charged instantly when the loom is started. Further, the time constant determined by the resistor 37 and the capacitor 38 is such that the capacitor 38 is charged to a saturated state in about 2 seconds.

Further, the output signal of the AND circuit 35 is input to a memory circuit 39, and the memory circuit 39 closes the relay contact 22b by exciting the coil 22a of the relay 22 for a predetermined time when the "H" signal is input. to activate the loom stop circuit 23.

Next, the operation will be explained based on the waveform diagrams of each part shown in FIGS. 4A and 4B.

First, we will explain what happens when the warp threads become loose. When the warp loosens, the dropper 15 falls and the elongated hole 15a of the dropper 15 approaches the upper part of the anode 18, and the fluff on the anode 18 is blown away by the discharge phenomenon of the capacitor 21, ensuring that they come into contact.
Due to this contact, a current flows between the anode 18 and the cathode 19 via the dropper 15, so the delay circuit 32
The input signal becomes "L" as shown in FIG. 4A, a, and the output signal of the delay circuit 32, delayed by this input signal, becomes "L" as shown in FIG. 4A, b.

As a result, the output of the NAND circuit 34 becomes "H", so the output of the second NOT circuit 36 becomes "L".
Then, charging of the second capacitor 38 is started. When this charging starts, the terminal voltage of the second capacitor 38 instantly drops as shown in FIG. 4A and e, and becomes "L" while the capacitor 38 is being charged. Regardless of changes in the input signal from 32, the capacitor 38 is maintained at "H" for 2 seconds while being charged, as shown in FIGS. 4A and 4C. Therefore, the tension of the warp loosened by the beating process is temporarily restored, the dropper 15 rises, the anode 18 and the cathode 16 are insulated, and the signal input to the delay circuit 32 becomes "H". The "H" signal is output from the NAND circuit 34 even if

At the start of this operation, the signal input to the delay circuit 32 is input to the first NOT circuit 33;
It is inverted by the NOT circuit 33 and input to the AND circuit 35, but due to the delay effect of the delay circuit 32, the "H" signal from the NOT circuit 33 shown in FIGS. Since it is set so that the "H" signal from the delay circuit 32 does not overlap, even if warp breakage is detected, the AND circuit 35
The output of is maintained at "L" as shown in Fig. 4A and f, and the loom is not stopped.

After that, the warp threads loosen again and Drotsupa 15
falls and the signal input to the first NOT circuit 33 becomes "L" and one input terminal of the AND circuit 35 becomes "H", the output of the NAND circuit 34 is maintained at "H". Therefore, AND circuit 3
9 becomes "H", the coil 22a is excited, the relay contact 22b is closed, the loom stop circuit 23 is activated, and the loom is stopped.

Therefore, if the warp tension returns naturally and the quality of the woven fabric is not affected, the dropper 1 is applied again.
Since the dropper 5 does not fall, the loom will not be stopped and productivity will not be reduced, and when warp yarn loosening occurs, which affects the quality of the woven fabric, the dropper 15 will fall again and the loom will be stopped. .

On the other hand, when the warp threads are cut, the signals input to the delay circuit 32 and the first NOT circuit 33 become "L" continuously, so the signal waveforms at each section become as shown in FIG. 4B. after the delay time has elapsed
The output of the AND circuit 35 becomes "H" and the loom is stopped. In this case, the loom is stopped when the signal from the warp breakage detection device ("L" level in FIG. 4A, a) continues for a predetermined time, that is, the delay time T1 _or more.

In this way, the loom is stopped when the warp breakage detection signal is input twice when the warp yarn becomes loose, while the loom is stopped when the detection signal is input once, such as when the warp tension returns naturally. Therefore, when warp yarn loosening occurs, which does not affect the quality of the woven fabric, the loom is not stopped and the productivity of the woven fabric does not decrease.

In this embodiment, the loom is stopped when the warp breakage detection signal is input twice, but the loom is not limited to this if the loom is stopped when the detection signal is input multiple times. good. In addition, the predetermined time is set to 2 seconds, and it is determined whether or not the loom can be stopped based on the detection signal input within this time, but the predetermined time may be shorter or longer than 2 seconds. Good too.

<Effects of the Invention> As explained above, the present invention is configured to stop the loom when the warp breakage detection signal is input multiple times within a predetermined period of time and when it is input continuously for a predetermined period of time. When the warp threads become loose or the warp threads are cut, which affects the quality of the woven fabric, the loom is stopped to maintain the quality of the woven fabric, but when the warp threads become loose, which does not affect the quality, the loom is not stopped and the woven fabric is cut. It does not cause a decrease in productivity. Also, since I connected a capacitor in parallel to the cathode and anode,
Since the fluff accumulated on the anode or cathode due to the discharge phenomenon of the capacitor when the dropper falls can be blown away, poor contact between the cathode or anode and the dropper can be eliminated, and warp breakage can be detected accurately.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a loom, Fig. 2 is a circuit diagram showing a conventional loom stop device, Fig. 3 is a circuit diagram showing an embodiment of the present invention, and Figs. 4A and B are the same as those in Fig. 3. It is a signal waveform diagram of each part. 2... Warp, 15... Dropper, 22... Relay, 23... Loom stop circuit, 32... Delay circuit,
34...NAND circuit, 35...AND circuit, 36
...Second NOT circuit, 38...capacitor.

Claims (1)

[Scope of Claims] 1. It has an anode 16, an anode 18, and a conductive dropper 15 that is engaged with the warp threads, and conduction is established between the cathode 16 and the anode 18 via the dropper 15 due to an abnormality in the tension of the warp threads. Warp breakage detection device 15, 16,
When stopping the loom based on signals from 18 and 19, a capacitor 31 is connected in parallel to the cathode 16 and anode 18, and the warp breakage detection device 15, 16, 18, 19
A warp breakage detection device 15, 1 characterized in that the loom is stopped when a signal from the loom is input continuously for a predetermined period of time or when a signal is input multiple times within a predetermined period of time.
How to stop a loom according to 6, 18, 19.