JPS6050900B2 - Lighting display method and device for weft insertion status - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and a device for visually displaying normal, abnormal and defective weft insertion in a loom by turning on and off lamps, and in particular to a method and a device for visually indicating normal, abnormal and defective weft thread insertion in a loom by turning on and off lamps, and in particular, it relates to a method and a device for visually displaying normal, abnormal and defective weft thread insertion in a loom by turning on and off lamps, and in particular, it relates to a method and a device for visually indicating normal, abnormal and defective weft thread insertion in a loom by turning on and off lamps. This system is designed to identify and monitor abnormalities in the weft insertion state by utilizing the bright and dark vision given to workers, and is particularly advantageous in collective operation of multiple looms.

In a loom, for example, in a water jet loom, a pair of electrode feelers are arranged at the reed side edge on the weft arrival side, spaced apart from each other along the weft flight direction, to form a detection end, and detect whether the weft has been inserted normally. A method has already been developed in which electrical bridging is achieved through contact of the weft threads, thereby bringing an electric circuit including the sensing end into a conductive state and generating a sensing signal.

If this detection signal is input to the lamp lighting device, the lamp will be lit when the weft insertion is normal.
Further, when the weft insertion condition is poor, the weft yarn does not reach the detection end and the electric circuit is not brought into conduction, so the lamp is not lit. That is, the weft insertion state can be visually displayed by turning on and off the lamp. With such a lamp lighting system, it is possible to visually distinguish whether the weft insertion state is normal or defective.

However, when inserting the weft, the loom does not stop, but
If the weft insertion condition is abnormal and the operation continues as it is, the degree of the abnormality will gradually increase, and the weft insertion condition may eventually become poor and the loom may stop. With the above-mentioned lamp lighting method, it is not possible to visually identify such abnormalities in the weft insertion state. If this abnormality in the weft insertion condition is detected while it is in progress and appropriate measures are taken, the eventual accident of poor weft insertion condition can be avoided, but the conventional lamp lighting method does not You can't expect the functionality up to now. The first purpose of this invention is to
Even in the advanced stages of abnormality in the weft insertion condition as described above,
By visually displaying this in real time, it is possible to predict and prevent defects in the weft insertion condition from occurring.

Furthermore, in order to correctly detect the weft insertion state, it is necessary to appropriately set the sensitivity level of the detection end. If the sensitivity level is too low, the detection end will pick up unnecessary noise, and if it is too high, it will not be able to correctly detect even if the weft insertion state is normal. In either case, the detection end will malfunction. Conventionally, setting this sensitivity level has relied on the use of special equipment such as an oscilloscope or on the intuition of workers.

For this reason, not only were there problems such as the complexity of using the equipment and the inaccuracy of relying on intuition, but the setting work itself required a considerable amount of time, effort, and skill. A second object of the present invention is to set the sensitivity level of the detection end as described above reliably, highly and easily, without relying on special equipment or intuition.

In order to achieve the above object, the present invention provides: - a storage device is interposed between the sensing end and the lighting device including the lamp;
The timing signal is a signal that stores and holds the detection signal generated when the weft reaches the weft detection end, and releases the memory at a predetermined timing after the timing when the weft should reach the weft detection end! If the weft detection signal is not generated by the predetermined timing mentioned above, the loom is stopped by the loom stop signal from the timing signal generator and the operation stop device connected to the detection end. This is to stop the

The present invention will be explained in more detail below with reference to one embodiment shown in the drawings.

As described above, the device of the present invention includes a detection end that detects the arrival of a weft and issues a weft detection signal, a comparator that compares this with a threshold value from a setting device, and a memory and hold unit that stores the results of weft detection. It includes a storage device, a lighting device connected to the storage device and including a lamp, a timing signal generator that operates in synchronization with the operation of the loom, and an operation stop device connected to the generator and the sensing end side. An example of a specific configuration is shown in FIG. 1.

In addition, the state of each signal at each timing is
As shown in the figure. In the following description, a method of representing logic circuit elements as shown in FIGS. 2A and 2B will be used. That is, the NAND gate is shown in FIG. 2A, and the RS type flip-flop (using a NAND configuration) is shown in FIG. 2B. Furthermore, the logic circuit is based on negative logic. In other words, for each element, when there is no signal input/output, it is considered a high potential (hereinafter abbreviated as "H"), and when a signal is input/output, it is considered a low potential (hereinafter abbreviated as "L"). . The weft signal W from the sensing end 0 is integrated in an integrator 1, and its output signal 1 is compared with a threshold signal A from a setter 5 in a comparator 3.

Here, when I>A, the comparator 3 outputs a rectangular wave signal C. In the illustrated example, the storage device 4 includes a differentiator 7 connected to the output side of the comparator 3, and a flip-flop 11 whose S terminal (set terminal) is connected to the differentiator 7.

Therefore, the rectangular wave signal C output from the comparator 3 is transmitted to the differentiator 7.
The pulsed weft detection signal D is then inputted to the S terminal of the flip-flop 11. The timing signal generator 2 has a differentiator 9, the output side of which is connected to the R terminal (reset terminal) of the flip-flop 11.

At a predetermined timing, a rectangular wave timing signal T
is generated, which passes through the differentiator 9 and becomes a pulse-like reset signal Res. This reset signal Res is input to the R terminal of the flip-flop. Note that the above-mentioned predetermined timing refers to the point in time after a predetermined period of time has elapsed from the timing when the weft should originally reach the weft detection end (generally starting at around a crank angle of 2400 if the weft insertion state is normal). It is determined according to the weaving conditions, but once it is determined, it remains unchanged unless the weaving conditions change. The lighting device 6 includes a diode 13 connected to the O terminal of the flip-flop 11, a lighting circuit 17 connected to the diode 13, and a lamp 15.

The lighting circuit 17 includes a power source, a transistor, etc., and functions to light the lamp 15 when the diode 13 becomes conductive in response to an output signal from the flip-flop 11. The operation stop device 8 is composed of an inverter 23 connected to a differentiator 9, a NAND gate 19 whose input side is connected to the comparator 3 and the inverter 23, and an operation stop circuit 21 connected to the output side of the NAND gate 19. Ru. If the input signal to the operation stop circuit 21 is required to have chronological characteristics, an appropriate storage element such as a flip-flop may be inserted between the NAND gate 19 and the operation stop circuit 21. Next, the operation of the lighting display device having the above configuration will be explained.

The operations described below differ greatly depending on (a) the case where the weft insertion condition is normal or abnormal, and (b) the case where the weft insertion condition is poor, so these will be explained separately.

Here, when the weft insertion condition is normal, the timing of the weft reaching the detection end is almost constant, whereas when the weft insertion condition is abnormal, the timing of the weft arrival at the detection end changes. . Further, if the weft insertion condition is poor, the weft yarn does not reach the detection end. First, before the weft detection signal D is input, that is, between weft insertion and weft insertion, in the flip-flop 11, S=H. ．． Since the state R=L remains, O=
The signal becomes H, and the lamp 15 remains off.

Also, since the output of the NAND gate 19 is 2H, the loom maintains its operating state. This state is shown in Table 1. (b) When the weft insertion condition is normal or abnormal, the crank angle is around 240 positive (
As mentioned above, the weft detection signal D is input at around 2400 when it is normal, and later than this when it is abnormal), and the flip-flop 11 receives S=L. ．． R=H. ,O
=L state.

Therefore, the diode 13 becomes conductive, and the lighting circuit 17
is activated and the lamp 15 lights up. On the other hand, Nand Gate 1
At 9, the output is still 2H, so the loom maintains its operating state. This state is shown in Table 2. crank angle 30
00, the reset signal Res is input, and the flip-flop 11 receives S=H. ．． R=L. ．． The state becomes O=H.

Therefore, the diode 13 is cut off, and the lighting circuit 17
is not activated and the lamp 15 is turned off. Further, near 3000 when the reset signal Res is issued, C=L. ．． Res
=L, but since it is inverted by the inverter 23,
The output of the NAND gate 19 becomes H, and the loom maintains its operating state. This state is shown in Table 3. Table A summarizes the above state transitions during one cycle. (b) When the weft insertion condition is poor When the weft insertion of the previous cycle is completed, the condition shown in Table 1 will occur.

In the current cycle, the weft threads do not reach detection because the weft insertion condition is poor. Therefore, even when the crank angle approaches 2400, the weft detection signal D is not input, and the flip-flop 11 maintains the state shown in Table 1. Therefore, the lamp 15 remains off.The NAND gate 19 continues to output. Since the loom is 2H, the loom is still in operation at this timing.When the crank angle approaches 300g, the reset signal Res is issued, but for the flip-flop 11, S=H, R=L, O. =H, so the lamp remains off.

However, since C=H and Res=L, the output of the NAND gate 19 becomes 2L, the operation stop circuit 21 is activated, and the loom stops operating. This state is shown in Table 4. Once the cause of the poor weft insertion condition has been removed, restart the loom. Then, when the crank angle is around 3000, the reset signal is inputted again, resulting in the state shown in Table 1. Table B summarizes the above state transitions during one cycle.

FIGS. 4A and 4B are graphs showing the lamp state changes shown in Tables A and B, respectively.

A dashed-dotted line drawn horizontally in the figure indicates the sensitivity level of the detection end. As is clear from these figures, the lamp turns off when the weft insertion condition is normal or abnormal, and remains off when the weft insertion condition is bad. It is.

Therefore, when a large number of looms equipped with the lighting display device of the present invention are operated in a group, it is difficult for workers to visually check each lamp and determine that a loom with no lamps on or off is the one where an accident occurred during weft insertion. There is. Of course, the loom has already stopped operating. According to the present invention, a worker can not only identify defects in the weft insertion condition as described above, but also visually recognize abnormalities.

In other words, even if the situation regarding weft insertion gradually worsens for some reason, it has a function to notify the worker of this before the deterioration progresses and ultimately leads to a defective weft insertion condition. There is something there. For example, during weaving, fuzzing may begin to occur in the warp yarns, which gradually progresses and eventually leads to incomplete shedding and poor weft insertion.

In this case, the beginning of fuzzing does not necessarily indicate a defect in the weft insertion condition, but due to the influence of a warp shedding defect, the time point at which the weft insertion is completed is delayed, and in many cases, the weft should actually reach the weft (weft) detection end. The timing at which the weft actually reaches the weft detection end is later than the timing (if the weft insertion state is normal). That is, the timing of inputting the weft detection signal D to the storage device 4 (more specifically, the flip-flop 11) is later than the crank angle 24010. As mentioned above, once the timing at which the memory in the storage device 4 is cleared (more specifically, the timing at which the reset signal Res is input to the flip-flop 11) is set, it remains constant as long as the weaving conditions do not change. The time will be shorter than that shown in FIG. This gives workers night vision. In other words, the worker judges that the weft insertion condition is normal for a loom whose lamp is on and off, and that an abnormal weft insertion condition is in progress for a loom whose lamp turns on and off but is slightly dark. If the lamp does not turn on or off, it can be determined that the weft insertion condition is poor.

That is, in addition to defects in the weft insertion condition, abnormalities in the weft insertion condition can also be identified. This makes it possible to prevent the occurrence of defects in the weft insertion state. In addition to the above-mentioned ability to detect abnormal progress in the weft insertion state, the present invention allows the sensitivity level of the detection end to be set reliably, highly and easily.

First, if the temporarily set sensitivity level is too low as shown by P in FIG. 5, the detection end will pick up noise before the weft thread is inserted, and the lamp will turn on.

Since the timing at which the noise signal exceeds the threshold value is not constant, the time until the light goes out can be changed every cycle (big) by clearing the memory in the storage device 4 (more specifically, by inputting the reset signal Res to the flip-flop 11). It will be different. As a result, the lamp repeatedly turns on and off more irregularly than when the weft insertion condition is normal. This appears to the worker as if the lamp were flickering extremely irregularly, allowing the worker to realize that the temporarily set sensitivity level was too low. If you gradually increase the sensitivity level, the irregular flickering will eventually disappear and the lamp will turn on and off periodically. Therefore, if the sensitivity level is fixed, an appropriate value can be obtained. On the other hand, if the temporarily set sensitivity level is too high as shown by Q in FIG. 5, the lamp will not light up even if the weft thread is inserted, and the loom will stop.

Therefore, in this case, if the sensitivity level is gradually lowered, the lamp will turn on and off periodically, and an appropriate sensitivity level will be obtained. Furthermore, if the sensing end consists of two electrodes, malfunctions are likely to occur due to insulation deterioration.
According to the present invention, it is also possible to detect the occurrence and progress of such a situation.

In other words, when insulation deterioration progresses to a certain extent, the detection end picks up noise even before the timing when the weft should normally reach the weft detection end, and as a result, the sensitivity level shown by P in Figure 5 is too low. will be in the same state.

That is, the lamp will flicker irregularly. Further, if the insulation deterioration progresses any further, the output 1 of the integrator 1 will always be higher than the threshold signal A, and the weft detection signal D will not be output from the integrator 7. That is, the weft detection signal does not enter the storage device 4 (more specifically, the flip-flop 11
(No set signal is received.) Therefore, the lamp remains off. Moreover, C=L. ．． Since Res is a repetition of L (5H), the loom maintains its state. In this respect, unlike the case where the weft insertion state shown in Table B is poor (the lamp goes out and the loom stops), In any case, it is possible to detect the insulation deterioration at the detection end and its progress.As is clear from the above explanation, according to the present invention, the defective weft insertion condition is simply visually displayed and the loom is automatically activated. It is possible to visually display abnormalities in the weft insertion condition, which will eventually develop into defects if left untreated, rather than just stopping the weft.

Therefore, it greatly contributes to improving the yield of good products, reducing the number of employees by reducing monitoring work, and improving the operating rate of the loom. In addition, no equipment such as an oscilloscope is required to set the sensitivity level of the detection end, and the work can be performed reliably, sophisticatedly, and easily without relying on the intuition of the operator.

Furthermore, it is also very advantageous in terms of maintenance management, since sensitivity reduction and its progress due to deterioration of insulation at the sensing end can be visually displayed.

[Brief explanation of the drawing]

FIG. 1: A block diagram showing the general configuration of the device of the present invention and one embodiment thereof. FIGS. 2A and B: Diagrams showing a method of displaying logic circuit elements.
Figure: Graph showing changes in various signals over time. Figure 4 A, B;
3 is a graph showing changes in weft signals and lamp states over time under various weft insertion conditions; FIG. 5: Graph explaining the setting work of the sensitivity label. W... Weft signal, I... Integrator output signal, A... Threshold signal, C... Comparator output signal, D... Weft detection signal, T... Timing signal, Res ... Reset signal, F... Storage device output signal, 2... Timing signal generator, 3... Comparator, 4... Storage device, 5... Setting device, 6... Lighting device, 8... Operation stop device, 9... Sensing end.

Claims (1)

[Claims] 1. A signal (Res) that stores and holds the weft detection signal generated when the weft reaches the weft detection end, and releases the memory at a predetermined timing after the timing when the weft should reach the weft detection end. ) is turned on, and if the weft detection signal is not generated by the predetermined timing, a loom stop signal is issued. A lighting display method for weft insertion state characterized by: 2. A lighting device 6 including a lamp, and a comparator 3 that compares the weft signal inputted from the weft detection end 0 and the threshold value inputted from the setting device 5, and outputs a signal when the former exceeds the latter. and a timing signal generator 2 that outputs a signal after a predetermined period of time has elapsed from the timing at which the weft should reach the weft detection end, which is determined by the weaving conditions.
The operation stop device 8 has an input side connected to a comparator and a timing signal generator, an output side is connected to a lighting device, an input side is connected to a comparator and a timing signal generator, and the timing is set by a signal from the comparator. A lighting display device in a weft insertion state, comprising a storage device 4 that is reset by a signal from a signal generator.