JP3669605B2 - Sub nozzle injection control method - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention is the air jet loom, relates to how to control the injection duration of the sub-nozzles.
[0002]
[Prior art]
In the air jet loom, weft insertion is performed by jetting air together with the weft thread from the main nozzle, and flying the weft thread into the warp thread opening. At this time, the sub nozzles of the plurality of groups assist the weft flying state by relay-injecting air in the weft insertion direction toward the tip of the weft yarn in the flying state.
[0003]
However, immediately after switching of the yarn supplier, Fei run arrival position of the weft with respect to a constant rotation angle of the loom main shaft precedes the position in the standard state of the weft flying run. Depending on the increase in load at the start of the loom and the yarn type, the leading amount increases, and the weft yarn is not normally conveyed by the sub nozzle, resulting in a weft insertion failure. On the other hand, it is conceivable to give a margin to the set injection period of the sub nozzle, but setting an extra injection period temporarily for a transient state of about 1% of the entire weaving period, for example, reduces the air consumption. It will increase wastefully.
[0004]
OBJECT OF THE INVENTION
Accordingly, an object of the present invention, the weft injected from a main nozzle, are transported by a plurality of sub-nozzles arranged along the flight track of the weft thread in an air jet loom that performs weft insertion, immediately after switching of the yarn supplier In addition, the weft yarn conveyance by the sub nozzle is stabilized to prevent the occurrence of a weft insertion failure and the air consumption by the sub nozzle is reduced.
[0005]
[Means for Solving the Invention]
Under the above object, the present invention provides a sub nozzle injection control method in which a standard injection period of a sub nozzle is set for the purpose of weft conveyance in a standard state of weft flying, in other words, a steady weft insertion state. When the change of the yarn feeder is detected, the injection start timing of the sub nozzle is advanced or the injection end timing is delayed at the same time .
[0006]
Here, the sub-nozzle injection control method is executed over a certain period from switching of the yarn feeders . The standard injection start timing and the standard injection end timing are set in advance on the time or on the rotation angle of the spindle. For this reason, control changes those timings.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 shows an outline of a weft insertion device 1 for an air jet loom. The weft yarns 2 are supplied from a plurality of, for example, two yarn feeders 3 that are tied together, and the length measuring and storing device 4 measures the length necessary for weft insertion of one pick, and stores it until the weft insertion start time. The length measuring storage device 4 is, for example, a drum type, and the rotating yarn guide 5 is rotated along the outer periphery of the drum 6 by the motor 8 and the weft yarn 2 is locked by the locking pin 7 on the outer peripheral surface of the drum 6. On the other hand, the length is measured and stored by winding it by a length necessary for filling at least one pick, for example, four turns.
[0010]
At the start of weft insertion, the locking pin 7 moves in the backward direction by the operation device 9 at the unwinding timing, thereby unwinding the weft yarn 2 in the storage state on the outer peripheral surface of the drum 6. At the same time, the main nozzle 13 serving as a weft insertion nozzle draws the unwound weft yarn 2 and inserts the weft yarn 2 together with the pressure air into the opening 16 of the warp yarn 15 together with the jet air.
[0011]
The unwinding controller 10 includes a rotation angle θ signal from the rotation detector 12 connected to the main shaft 11 of the loom, a weft arrival timing deviation Δθe signal from the control device 22, and other standard unwinding timing θs0, With the standard locking timing θe0 signal as an input, the unwinding timing θs and the locking timing θe signal control the forward / backward movement of the locking pin 7.
[0012]
A state in which the weft 2 is unwound from the drum 6 and the number of unwinding windings are detected by a unwinding sensor 19. The unwinding sensor 19 is constituted by, for example, a combination of a pair of light projectors and light receivers, detects the unwinding state and the number of unwinding windings by blocking the light by the unwound weft yarn 2, and is unwound one turn. Two pulse-shaped unwinding signals S1 are generated every time and sent to the control devices 21c and 21d. Note that the switching state of the two yarn feeders 3 is detected by the thread switching sensor 20 as a thread switching signal S2.
[0013]
As a result of the jet of compressed air, the weft 2 rides on the jet air flow and flies along the flight path inside the opening 16. In this flying path, a plurality of sub-nozzles 14a, 14b, 14c, 14d of 4 groups a, b, c, d, for example, are arranged along the flying direction of the weft yarn 2, and as seen in FIG. Depending on the flying position at the tip of the weft yarn 2, the air is assisted by the relay injection of the pressure air sequentially over, for example, standard injection periods Ta0, Tb0, Tc0, Td0.
[0014]
The arrival sensor 17 is a feeler for detecting whether the weft insertion is good or not, and generates the arrival signal Se by detecting the leading end of the weft yarn 2 on the counter weft insertion side and sends it to the control device 22.
[0015]
The state of the flying speed of the weft yarn 2 can be detected by an arrival sensor 18 provided in the middle of the flying path inside the opening 16 of the warp yarn 2, for example, between the sub nozzle 14a of the group a and the sub nozzle 14b of the group b. it can. The arrival sensor 18 generates the arrival signal Sb of the weft yarn 2 by detecting the tip of the weft yarn 2 in flight, and sends it to the control devices 21c and 21d corresponding to the groups c and d.
[0016]
The time from when the weft 2 is unwound to the time when it reaches the installation position of the arrival sensor 18 and the unwinding length (the number of unwinding windings) of the weft 2 are proportional to each other. The time at which the weft 2 reaches the installation position can also be detected by the unwinding sensor 19 as the unwinding signal S1 on the length measuring storage device 4 side. In this example, the control devices 21c and 21d of the groups c and d use the unraveling signal S1 instead of using the arrival signal Sb.
[0017]
The pressure air for filling is supplied from the pressure air source 23 through the supply path 24 to the main nozzle 13 via the pressure regulator 25 serving as a tank and the electromagnetic valve 27, and to the main nozzle 13 as well as the pressure regulator 26 serving as a tank. The valves 28a, 28b, 28c, and 28d are supplied to the sub nozzles 14a, 14b, 14c, and 14d of the groups a, b, c, and d, respectively.
[0018]
Here, the control device 22 receives the rotation angle θ signal from the rotation detector 12 and the arrival signal Se from the arrival sensor 17 in order to control the movement of the locking pin 7 and the injection of the main nozzle 13. In addition to generating a signal of deviation Δθe to the unwinding controller 10, the injection period (injection start timing, injection end timing) of the main nozzle 13 is adjusted by controlling the opening and closing of the electromagnetic valve 27.
[0019]
Further, the control devices 21a and 21b control the opening and closing of the electromagnetic valves 28a and 28b with the rotation angle θ signal from the rotation detector 12 as an input in order to control the sub nozzles 14a and 14b of the groups a and b, respectively. Thus, the standard injection periods Ta0 and Tb0 (injection start timings θa0 and θb0, injection end timings θa1 and Tb1) of the sub nozzles 14a and 14b are controlled in a steady state.
[0020]
Further, the control devices 21c and 21d receive the rotation angle θ signal from the rotation detector 12 and the unwinding signal S1 from the unwinding sensor 19 in order to control the sub nozzles 14c and 14d of the groups c and d, respectively. The standard injection periods Tc0, Td0 (injection start timings θc0, θd0, injection end timings θc1, θd1) of the sub nozzles 14c, 14d are set by controlling the opening and closing of the electromagnetic valves 28c, 28d. Change it according to.
[0021]
In this embodiment, the control device 20 for the main nozzle 13 detects the arrival time of the leading end of the weft thread 2 by the arrival sensor 17 on the counter weft insertion side as necessary, and the arrival signal Se is quickly transmitted. The arrival timing of the weft yarn 2 is always adjusted at the weft end on the anti-weft insertion side by changing the release timing of the locking by the locking pin 7 and the injection period (injection start timing) of the main nozzle 13 according to the margin or delay. Control to achieve standard arrival timing.
[0022]
Next, FIG. 2 shows a configuration of the control device 21c of the sub nozzle 14c corresponding to the group c as an example. The configuration of the control device 21d is basically the same as that of the control device 21c.
[0023]
The control device 21c, the detector 31 of the switched state of the yarn supplier 3, the detector 32 in the state of running weft speed, when the switched state of the yarn supplier 3, the injection start timing θc2 for backup A setting unit 35 for setting, a setting unit 36 for setting the injection start timing θc0 at the standard time, a setting unit 37 for setting the injection end timing θc3 for backup when the weft yarn is delayed, and a standard injection end timing θc1 The setting device 38 to be set, the setting devices 35 and 36 to switch the setting devices 37 and 38 according to the outputs from the detectors 31 and 32, the switching devices 33 and 34 for switching the setting devices 37 and 38, and the rotation angle θ signal from the rotation detector 12 The injection start command comparator 39 for outputting the command of the switched injection start timing θc0 or injection start timing θc2, and switching according to the rotation angle θ. The injection end command comparator 40 that outputs the commands of the injection end timings θc1 and θc3 switched by the changer 34, the injection start timings θc0 and θc2, the injection end timing θc1 from these comparators 39 and 40, or the injection The driving unit 41 includes a flip-flop 42 that sets the injection periods Tc0, Tc1, and Tc2 according to the command of the end timing θc3, and a drive amplifier 43 that drives the electromagnetic valve 28c according to the output thereof.
[0024]
Note that the control devices 21a and 21b corresponding to the other groups a and b have substantially the same configuration as the control devices 21c and 21d, but the detector 32, the setting device 37, There is no equivalent to the switch 34.
[0025]
FIG. 3 shows an example of the detector 31 for switching the yarn feeder 3 . The detector 31 for switching the yarn feeder 3 receives the restart signal S as an input to detect the transition state of the weft insertion, and also receives the yarn switching signal S2 as an input to thereby switch the yarn feeder 3. In order to detect, it is constituted by two fixed period signal generators 44 and 45 having these signals as inputs, an OR gate 46 having these outputs as inputs, and a set period 47 of the fixed period signal generator 44. ing.
[0026]
Next, FIG. 4 shows an example of the detector 32 in the state of the weft flying speed. The detector 32 of this embodiment uses the reference rotation angle θo given by the setting device 48 and the signal of the rotation angle θ from the rotation detector 12 to determine whether or not the injection end timing θc1 needs to be switched. The comparator 49 that generates an output when the rotation angle θ becomes equal to the reference rotation angle θo, counts the pulses of the unwinding signal S1 from the unwinding sensor 19, and is set by the pulse number setting unit 52. When the number of pulses reached, the counter 51 for generating an output, the generation time of the output of the counter 51 and the output time of the comparator 49 are compared, and the output time from the counter 51 is the output from the comparator 49. When it is later than the time point, it is determined that the state of the flying speed of the weft thread 2 in this weft insertion cycle is delayed, a switching command is generated, and this is sent to the switch 34. The comparator 50 is configured.
[0027]
FIG. 5 shows that the weft yarn 2 travels on the rotation angle θ of the main shaft 11 by associating the travel position of the weft yarn 2 with the positions of the sub nozzles 14a, 14b, 14c, 14d of each group a, b, c, d. The characteristic is shown as a straight line for convenience. In the normal weft insertion, the sub nozzle 14a injects over the standard injection period Ta0 (injection start timing θa0, injection end timing θa1), and the sub nozzle 14b has an injection period Tb0 (injection start timing θb0, injection end timing θb1). ). Further, the sub nozzle 14c performs an injection operation over the injection period Tc0 (injection start timing θc0, injection end timing θc1), and the sub nozzle 14d performs injection over the injection period Td0 (injection start timing θd0, injection end timing θd1). Thus, air in the weft insertion direction is jetted by the weft yarn 2 that is flying.
[0028]
However, when the state of the flying speed of the weft yarn 2 in the middle of weft insertion is detected as being delayed, the sub-nozzles 14c and 14d controlled by the control devices 21c and 21d in the same weft insertion cycle respectively perform the injection end timing θc1. , Θd1 are changed to backup injection end timings θc3, θd3, and the injection periods Tc1, Td1 are added after the respective injection periods Tc0, Td0, thereby extending the injection periods in the delay direction as a whole. To do.
[0029]
Further, when the weft insertion is in a transitional state when switching of the yarn feeder 3 is detected, the inclination of the weft flying straight line changes in a direction larger than the standard time. That is, on the rotation angle θ of the main shaft 11, the flying speed of the weft 2 is relatively high. Accordingly, the control devices 21a, 21b, 21c, and 21d set the injection periods Ta2, Tb0, Tc0, and Td0 before the standard injection periods Ta0, Tb0, Tc0, and Td0 by setting the early injection start timings θa2, θb2, θc2, and θd2. Tb2, Tc2, and Td2 are added. Thus, according to the flying state of the weft yarn 2, the control devices 21a, 21b, 21c, and 21d have a backup injection period Tc1, behind the standard injection periods Ta0, Tb0, Tc0, and Td0. By adding Td1 or by adding backup injection periods Ta2, Tb2, Tc2, and Td2 before that, the sub nozzles 14a, 14b, 14c, and 14d are injected in a state that conforms to each weft flying straight line. Set the period.
[0030]
The above operation will be described with respect to the control device 21c. When the yarn feeder 3 is not in the switching state , the switching unit 33 sends a signal of the injection start timing θc0 at the standard time to the comparator 39. Therefore, the comparator 39 outputs a command of the injection start timing θc0 when the injection start timing θc0 and the rotation angle θ coincide with each other, sets the flip-flop 42 in the drive unit 41 to the set state, and electromagnetically starts from that time. The valve 28c is opened.
[0031]
On the other hand, when the state of the weft flying speed in the middle of weft insertion is detected by the detector 32 and, as a result, it is determined that it is in the state of the standard weft flying speed, the switching device 34 performs the injection end timing at the standard time. θc1 is output to the comparator 40. Therefore, the comparator 40 resets the flip-flop 42 when the rotation angle θ reaches an angle value corresponding to the injection end timing θc1. At this time, the drive unit 41 closes the electromagnetic valve 28c and ends the injection of air from the sub nozzle 14c. As a result, the sub nozzle 14c performs injection for the standard injection period Tc0.
[0032]
During the weft insertion operation, the comparator 49 outputs an output at the reference rotation angle θo, and the counter 51 counts the number of pulses of the unwinding signal S1 from the unwinding sensor 19, and is set by the setting device 52. When the measured value is reached, a count-up output is generated and sent to the comparator 50. When the time point of counting up by the counter 51 is delayed from the time point when the output of the comparator 49 is generated, that is, during the weft insertion, when the state of the flying speed of the weft yarn 2 is lower than the standard, the comparator 50 In the filling cycle, a switching command is generated to switch the switching device 34.
[0033]
Therefore, the switch 34 outputs a backup injection end timing θc3 to the comparator 40 instead of the standard injection end timing θc1. Therefore, the comparator 40 operates the drive unit 41 with the injection end timing θc1 as the injection end timing θc3 for backup in the filling cycle to be controlled. Similarly, the control device 21d also adds a backup injection period Td1 to the standard injection period Td0 to cope with a delay in the flying speed of the weft yarn 2. As a result, the sub nozzles 14c and 14d of the two groups c and d add backup injection periods Tc1 and Td1 to the standard injection periods Tc0 and Td0.
[0034]
When the yarn feeder 3 is in the switching state, the detector 31 switches the switching device 33 by outputting a switching state command, and instead of the standard time injection start timing θc0, the backup injection start timing is switched. θc2 is sent to the comparator 39. For this reason, the comparator 39 starts the injection of the sub nozzles 14c of each group c at the injection start timing θc2 that is earlier than the standard time injection start timing θc0. The injection start backup control is performed for all the sub-nozzles 14a, 14b, 14c, and 14d.
[0035]
Note that arrival timing control (feedback control) for changing the weft insertion start time may be used in combination. For example, the injection start timing of the main nozzle 13 and / or the weft unwinding timing by the locking pin 7 may be changed in a direction to eliminate the deviation between the arrival timing and the reference arrival timing.
[0036]
Here, in setting the unwinding pulse by the setting device 52, the following is considered. (1) In the initial stage of weft insertion, there is a possibility that the judgment is wrong because the variation is small. (2) On the other hand, if it is too late, the effect of delaying the injection end timing is not sufficiently reflected on the sub-nozzle 14c on the yarn supply side, and there is a risk of poor weft insertion. Considering the above, it is desirable to set the number of pulses indicating that the number of turns corresponding to half of one pick has been solved in the setting device 52. Since the unwinding sensor 19 of the embodiment outputs two pulses every time one weft yarn is unwound, a total of eight pulses are output when one pick has four turns. Therefore, 4 is set in the setting device 52. It is obtained by repeating the trial weaving while appropriately changing the standard value so that the air consumption is minimized.
[0037]
FIG. 6 shows an experimental example of the correlation between the unwinding signal S1 (the output timing of the fourth pulse) and the weft arrival timing (arrival angle) at that time. In each weft insertion, it can be understood from FIG. 6 that even when the output time of the unwinding signal S1 is the same, the arrival timing of the weft yarn 2 is not necessarily the same. 7, 8, and 9 show an example in which the distribution region of FIG. 6 is represented by an ellipse, and the reference timing (reference rotation angle θo) and the sub-nozzle off timing (standard time injection end timing) are set for this. ing.
[0038]
First, FIG. 7 shows a state in which the reference timing θo and the off timings θc1 and θd1 of the sub nozzles in groups c and d are set to optimum values, respectively. That is, it shows a state in which the off timings θc1 and θd1 of the sub nozzles of the groups c and d are set to such an extent that the weft yarn having the latest arrival timing when the unwinding timing coincides with the reference timing θo can be normally conveyed. The hatched portion indicates a region where the sub nozzles of the groups c and d set at the off timings θc1 and θd1 cannot normally carry the weft yarn. When the output timing of the fourth pulse is output after the reference timing θo, the off timing is switched to θc3 and θd3, but the ratio of the hatched portion to the elliptical portion on the right side of the reference timing θo in FIG. 7 is relatively large. Therefore, the air saving effect by sub nozzle off timing control can be expected considerably.
[0039]
Next, FIG. 8 shows a bad setting example. The sub-nozzle off timings θc1 and θd1 are examples that do not cover the weft yarn with the latest arrival timing when the unwinding timing coincides with the reference timing. In this case, if the unwinding timing is earlier than the reference timing (shaded area in FIG. 8), the sub-nozzle off timing is not extended, and the sub-nozzle correction off-timing is not injected. Stops due to increase.
[0040]
Furthermore, FIG. 9 shows an example with less air saving effect. Here, a case where the reference timing is set too large is shown. Also at this time, the sub-nozzle off timings θc1 and θd1 are set to such an extent that normal weft conveyance can be performed for the weft insertion with the latest arrival timing when the unwinding timing coincides with the reference timing θo. However, since the value becomes larger than the value shown in FIG. 7, a large amount of air is consumed accordingly. Further, since the ratio of the hatched portion to the elliptical portion on the right side of the reference timing θo in FIG. 9 is small, the air saving effect by the sub nozzle off timing control cannot be expected from this point.
[0041]
Instead of the rotation angle θ of the main shaft 11, the reference value may be after a predetermined delay time from a timing signal indicating the start of weft insertion, such as the timing of unlocking by the locking pin 7. Such a method for determining the reference value is particularly effective when used in combination with a control for changing the start timing of the padding to make the arrival timing constant. The control method of the present invention may be applied to arrival timing control in which the pressure to the main nozzle 13 is changed in the subsequent weft insertion cycles in order to set the detected weft arrival timing as a target value. As shown in FIGS. 10 and 11, the backup off period may be set by a delay time. In this case, delay circuits 53 and 54 are interposed between the comparators 39 and 40 and the switching devices 33 and 34, and these delay times are set independently by delay time setting units 55 and 56, respectively. It is like that. Each switching unit 33, 34 switches the output of the comparators 39, 40 or the delayed output thereof in accordance with the output of the detectors 31, 32 and outputs the result to the comparators 39, 40.
[0042]
In the case of multi-color weft insertion, a standard injection end timing θc1 and a backup injection end timing θc3 are set for each yarn type, and an injection corresponding to the yarn type is performed by selectors 57 and 58 as shown in FIG. The end time may be output. The same applies to the injection start timing.
[0043]
When the weft yarn 2 is in a transitional state, especially when the yarn feeder 3 is switched, not only the injection start time may be advanced, but also the injection end time may be delayed. Depending on the yarn type, the weft flying speed may be slow, but this can be handled.
[0044]
The periods Tc1 and Td1 for delaying the end of injection may be values common to a plurality of target sub-nozzle groups.
[0045]
In the embodiment described above, the injection end backup control is performed to delay the injection periods Tc0 and Td0 in response to the delay in the weft flying speed during the weft insertion, but the injection periods (Tc0 + Tc1) and (Td0 + Td1) are standard. If the injection period is set, the control for delaying the injection period can be omitted. At this time, the detector 32, the backup setting device 37, and the switching device 34 in the weft flying speed state in FIG. 2 are omitted, and the standard injection end timing θc1 by the standard setting device 38 is used as the injection end timing θc3. Set as. As a result, the injection period at the standard time is the injection period (Tc0 + Tc1) and (Td0 + Td1).
[0046]
The present invention can also be carried out with the following modifications. (1 ) When the yarn feeder 3 is switched, not only the injection start timing may be advanced, but also the injection end timing may be delayed. This is because, depending on the yarn type, the weft flying speed may be slow. (2) The injection period for setting the injection period early can also be set as a value common to the plurality of sub-nozzle groups. In addition, the control at the time of switching of the yarn feeder 3 may be made to advance the injection start timing, or advance the injection start timing and delay the injection end timing.
[0047]
【The invention's effect】
In the present invention, at the time of switching of the yarn feeder, by changing the timing of the sub nozzle injection start or injection start / end of injection , stable weft yarn conveyance can be achieved without unnecessarily lengthening the sub nozzle injection period. It becomes possible.
[Brief description of the drawings]
FIG. 1 is a block diagram of a weft insertion device.
FIG. 2 is a block diagram of a sub-nozzle control device.
FIG. 3 is a block diagram of a transient detector.
FIG. 4 is a block diagram of a detector in a state of weft flying speed.
FIG. 5 is a graph of a weft flying straight line.
FIG. 6 is an explanatory diagram of unwinding timing and arrival timing.
FIG. 7 is an explanatory diagram of unwinding timing and arrival timing.
FIG. 8 is an explanatory diagram of unwinding timing and arrival timing.
FIG. 9 is an explanatory diagram of unwinding timing and arrival timing.
FIG. 10 is a block diagram of another embodiment.
FIG. 11 is a block diagram of another embodiment.
FIG. 12 is a block diagram of another embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Weft insertion apparatus 10 Unwinding controller 11 Main axis | shaft 12 Rotation detector 13 Main nozzle 14a, 14b, 14c, 14d Sub nozzle 17 Reaching sensor 18 Reaching sensor 19 Unwinding sensor 20 Thread change sensor 21a, 21b, 21c, 21d Control apparatus 22 Control device 27 Solenoid valve 28a, 28b, 28c, 28d Solenoid valve 31 Detector 32 Detector 33 Switching device 34 Switching device 35 Setting device 36 Setting device 37 Setting device 38 Setting device 39 Comparator 40 for injection start command Injection end Command comparator 41 drive unit

Claims (2)

The standard injection period of the sub nozzle for conveying the weft yarn in the steady state of the weft insertion is set, and immediately after the yarn feeder is switched, the reaching position of the weft yarn flying with respect to the constant rotation angle of the main shaft of the loom is In the weft insertion that precedes the reaching position in weft flying in the standard state ,
Based on the detection signal of the switching of the yarn supplier, between certain period after switching yarn supplier, the injection control method of the sub-nozzle, characterized in that advancing the injection start timing of the sub-nozzle. A standard injection period of the sub-nozzle for conveying the weft yarn in the steady state of the weft insertion is set, and the injection start timing of the sub-nozzle is advanced at the same time as the sub-nozzle switching detection signal is advanced. Is delayed by a preset period. A sub-nozzle injection control method.

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