JPH02175956A - Detector of abnormal weft inserting in fluid jet type weaving machine - Google Patents

Abstract

PURPOSE:To enable immediate detection of abnormality in a control system of pressurized fluid and prevent occurrence of a defective woven fabric by measuring the consumption of the fluid, comparing the measured value with the preliminarily set threshold value and giving a warning in case of exceeding the threshold value during the operation of weft inserting using fluid jet from the main nozzle. CONSTITUTION:During the operation of weft inserting using fluid jet from the main nozzle, the consumption of the fluid is measured by a flowmeter equipped in the piping system arranged from the source of pressurized fluid to the above-mentioned main nozzle and the measured value is output as a pulse signal. On the other hand, a threshold value for the standard consumption of the fluid is preliminarily set in a setting unit and the consumption value by the above-mentioned measurement is compared with the threshold value. In case the above-mentioned measured value is beyond the threshold value, the stop signal is output to the drive control system of a weaving machine to inform occurrence of some abnormality such as operation failure of a closing valve, misset of opening and closing angles, nozzle clogging or pipe leakage in a control system of pressurized fluid. In this case a warning signal is given at the same time.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a device for a fluid injection type machine, and particularly to a device for detecting an abnormality in weft insertion from the amount of fluid consumed during weft insertion.

Background of the Invention A fluid injection loom inserts the weft yarn into the warp opening by injecting water or air as a pressure fluid from a weft insertion nozzle at a predetermined rotation angle. In this case, the on-off valve may open and close incorrectly due to mechanical failure, the opening/closing angle may be incorrectly set due to human error, that is, the loom rotation angle when the on-off valve performs the opening/closing operation, the weft feeding nozzle may become clogged, and the pressurized fluid may If there is a leak in the piping system, weaving becomes unstable, resulting in defective fabric.

Prior Art Therefore, the invention of JP-A-60-224837 measures the time difference from the time when a drive signal is output to the solenoid valve for horizontal insertion until the pressure on the output side of the valve reaches a predetermined value.
Monitoring the normal or abnormal status of the valve. According to this technology, abnormalities in valves can be detected. However, if there is an error in the setting of the opening/closing angle of the valve, if the nozzle for horizontal insertion is clogged, or if there is a leak in the piping, these conditions cannot be detected even with the above technology. Therefore, another monitoring means is required to detect the above abnormality. Furthermore, if an attempt is made to detect abnormalities in the opening and closing operations of all valves, abnormality detection means will be required for each of the many valves.

On the other hand, the invention disclosed in JP-A No. 59-125941 measures the amount of water instantaneously injected from a horizontal nozzle, compares this measured value with a certain tolerance deviation, and detects an abnormal state from the magnitude relationship. In the event of an abnormality, it outputs an alarm or a signal to stop the loom.

In the case of this technology, instantaneous flow rate is required, so it is possible to detect when the injection rotation angle is inappropriately set or when there is an abnormality in the injection angle due to mechanical failure of the pump. I can't.

In addition, in the case of multi-colored weft insertion, the pressure during weft insertion and the start and end points of weft insertion differ depending on the type of weft thread, so detection of abnormalities in weft insertion is performed for each type of weft thread. must be done.

OBJECTS OF THE INVENTION Accordingly, an object of the present invention is to detect all abnormalities in the wefting elements, ie, the main nozzle and sub-nozzle for wefting, on-off valves, piping, etc., with a simple configuration, and to prevent the occurrence of defective fabric. To prevent or minimize the occurrence of

Another object is to be able to accurately detect such abnormal conditions for each type of weft thread.

Solution to the Invention Based on the above object, the present invention measures the amount of fluid consumed during the wefting operation in the piping route from the pressure fluid source to the nozzle for wefting, and sets this consumption amount in advance. It compares it with a threshold value and electrically determines whether the weft insertion is normal or abnormal based on the magnitude relationship.

Here, the fluid consumption amount indicates the relationship between the time for at least one rotation of the loom or the number of bigs and the corresponding flow rate, and includes the flow rate per pink, the flow rate per standard time or standard big time, and It is determined as the number of pinks per standard volume or time.

In addition, these fluid consumptions can be changed by inputting the weft selection signal to deal with multi-colored weft insertion.
It is calculated separately for each type of weft. These fluid consumption amounts include information on all failures, such as mechanical opening/closing failures of on-off valves, artificial opening/closing angle settings failures, clogging of horizontal insertion nozzles, and leakage of piping. Therefore, all failures occurring in the pressure fluid control system can be detected immediately.

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a piping route of a fluid control device 1 for a fluid injection type loom.

The fluid control device 1 of this embodiment is intended for a two-color weft-filling air-injection loom. A common pressure fluid 'a2 is branched by a pipe 3, and is sent to two main nozzles 5 through two controllers 4. At the same time, it is supplied to a plurality of sub-nozzles 7 via a common controller 6. The controller 4 is located in the middle of the piping 3, and in the order of the pressure fluid supply direction, a regulator 8,
Tank 9, electromagnetic throttle valve 10, and electromagnetic shut-off valve 1
1 is interposed. Similarly, the controller 6 is connected to a common regulator 1 along the fluid supply direction in the path of the piping 3.
2. The tank 13 is connected to the sub-nozzle 7 of each group via an electromagnetic on-off valve 14 and a shunt 15 for each group.

The weft insertion abnormality detection device 21 of the present invention is connected, for example, to the downstream side of the pressure fluid source 2.

As shown in FIG. 2, this horizontal insertion abnormality detection device 21 is composed of a consumption measuring device 22, a setting device 23, a comparator 24, and the like. A pressure detector 25 and a flow meter 26 inside the consumption measuring device 22 are interposed in the piping 30 section, and are connected to a converter 28 together with a temperature detector 27. This converter 28 is connected on the output side to two arithmetic units 29 corresponding to two colors, a comparator 24 and a display 31. Each comparator 24 is connected on the input side to a maximum and minimum threshold setter 23, respectively, and on the output side to an over or under alarm 32, 33 and, if necessary, , is also connected to an output terminal 34 for a stop signal. Note that this calculator 29 is also connected to input terminals 35, 36, and 37 for the operating signal, weft selection signal, and reference signal in order to calculate the fluid consumption amount.

Operation of the invention During weaving, the controller 4.6 injects pressurized fluid from the corresponding main nozzle 5 and sub-nozzle 7 by opening the on-off valve 11.14 in response to an external control TB multiplier signal. At this time, the selected weft yarn 16 is carried by the jet fluid from the main nozzle 5, flies through the warp yarn frontage, and is successively urged by the sub-nozzle 7 to be inserted into the weft.

During this operation, the flow meter 26 outputs information corresponding only to the volume of the passing fluid, for example, as a pulse signal, regardless of the pressure, and sends it to the converter 28, as shown in FIG. Here, the converter 28 inputs, in addition to the pulse signal, the pressure value of the pressure fluid measured by the pressure detector 25 and the temperature value of the pressure fluid detected by the temperature detector 27, for example, the flow meter 26 The volume of the pressure fluid for each pulse is converted to the volume in the standard state, and the volume is sequentially output to the calculator 29. Here, the computing unit 29 inputs the operating signal and starts computing operation by validating the output from the converter 28 only when the loom is in operation. In this way, the measurement accuracy is improved by excluding from the integration the amount of air consumed by constant injection while the loom is stopped, the amount of air consumed during inching operation, and the like. Further, this computing unit 29 inputs a weft selection signal and a reference signal such as a pick signal or a clock signal, and inputs the signal from the converter 28 for each weft insertion cycle of each weft thread, and integrates the signal for each weft type. The fluid consumption amount, for example, the volume/reference volume or reference time is calculated for each time, and this is displayed on the display 31 and output to the comparator 24. The comparator 24 is
For each yarn type, the input fluid consumption amount is compared with the maximum or minimum threshold value for the standard fluid consumption amount preset by the setting device 23, and the calculated fluid consumption amount is the maximum value. When the threshold is exceeded or below the minimum threshold, a stop signal is output to the control system of the loom, an alarm signal is output, and one of the alarms 32, 33 is activated. As a result, on the downstream side of the air consumption measuring device 22, mechanical failure of the on-off valve 11.14, an artificial mistake in setting the opening/closing angle, clogging of the main nozzle 5 or sub-nozzle 7 for horizontal insertion, and If any of the above occurs, such as a leak, the abnormal condition will be detected as an abnormal decrease or increase in air consumption.

FIG. 3 shows changes in the amount of pressure fluid consumed per rotation of the loom together with changes in the pulse signal from the flowmeter 26. When the fluid consumption amount (flow rate/1 cycle) deviates from a preset upper or lower threshold, the comparator 24 operates the alarm 32.33 to
Inform the administrator of the status. Therefore, the administrator
By identifying the oversized or undersized alarm 32,33 and further correlating this with the type of weft thread 16,
This will lead to the assumption that something is wrong.

The sub-nozzle controller 6 is commonly used for all types of weft yarn, and if the weft insertion conditions, such as pressure and flow rate, are set regardless of the yarn type, the weft selection signal It is not necessary to correspond to

Other Embodiments of the Invention Although the embodiment described above detects the flow rate immediately downstream of the pressure fluid source 2, this detection position is different from that of each controller 4.6.
It may be provided independently on the input side of the. Moreover, if this technique is combined with the technique of Japanese Patent Laid-Open No. 60-224837, when an abnormality occurs, the cause can be easily identified. Further, the fluid consumption measuring device 22 is not limited to the one in the above embodiment, but can of course be replaced with other known devices. When converting this volume into a standard state value, as in the above embodiment, the actual measured value of pressure may be used, or the pressure setting value may be used. When the set pressure value is constant, it is sufficient to calculate the fluid consumption amount at the set pressure value and compare this with the threshold value at the set pressure value, so there is no need to convert the volume. In addition, when applied to a water jet loom, it is preferable to provide a fluid consumption measuring device in a path where the pressure is constant, for example, from a water supply source to a water tank.

Effects of the Invention The present invention detects any abnormal condition in the pressure fluid control system, such as mechanical opening/closing failure of the on-off valve, human error in setting the opening/closing angle, clogging of the horizontal insertion nozzle, or leakage of piping, etc. Even if this condition occurs, it is immediately detected by the weft-feeding abnormality detection device, and a signal to stop the loom or an alarm signal for the abnormal condition is generated so that it can be confirmed immediately, thereby preventing the occurrence of defective fabrics. , or its occurrence is minimized. Furthermore, since the amount of fluid consumed is continuously monitored over time, it is easy to set and manage the most appropriate amount of fluid consumed.

In particular, since the fluid consumption amount is monitored for each type of weft yarn, even in the case of multi-colored weft insertion, while identifying the type of weft yarn, it is possible to immediately identify the corresponding abnormal state of the fluid control system.

[Brief explanation of the drawing]

FIG. 1 is a piping diagram of the fluid control device, FIG. 2 is a block diagram of the horizontal insertion abnormality detection device of the present invention, and FIG. 3 is a waveform diagram during operation. 1. Fluid control device, 2. Pressure fluid source, 3. Piping,
4...Controller, 5...Main nozzle, 6...Controller, 7
... Sub-nozzle, 21 ... Lateral insertion abnormality detection device, 22
...consumption measuring device, 23..setting device, 24..comparator,
25...Pressure detector, 26...Flow meter, 27...Temperature detector, 28...Converter, 29...Calculator, 31...Display device, 32.33...Alarm device. Patent Applicant Tsudakoma Kogyo Co., Ltd. Representative Patent Attorney Kunio Nakagawa Figure 7 Figure 3 (J Shunma Transit Body Section)

Claims (2)

[Claims] (1) In a fluid injection loom that injects fluid from a weft insertion nozzle and inserts the weft yarn into the warp opening using the fluid, fluid flows in a predetermined piping route from a pressure fluid source to the weft insertion nozzle. A fluid consumption meter that measures the consumption of fluid, a setting device that sets a threshold for standard fluid consumption, and compares the measured fluid consumption with the above threshold and determines the fluid consumption. A horizontal insertion abnormality detection device comprising a comparator that outputs an alarm signal when a threshold value is exceeded. (2) In a fluid injection loom that injects fluid from a weft insertion nozzle and uses this fluid to insert the weft thread into the warp opening, this is done in a predetermined piping route from the pressure fluid source to the weft insertion nozzle. A fluid consumption measuring device that takes a weft yarn selection signal as an input and measures the fluid consumption during the weft insertion cycle of that weft yarn, and multiple settings that set standard thresholds for fluid consumption for each multicolored weft yarn. and a plurality of comparators that compare the fluid consumption amount with the threshold value and output an alarm signal when the fluid consumption amount exceeds the threshold value. Device.