JP2892391B2 - Loom weft insertion control device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loom for continuing the operation of a loom without trouble even in a jet loom, even when the flight characteristics of a weft yarn fluctuate rapidly due to yarn supply change or the like. To a weft insertion control device.

2. Description of the Related Art In a jet loom, in particular, an air jet loom, weft insertion may become unstable due to a change in flight characteristics of a weft used for weaving. This is considered to be a major cause of a change in the air resistance of the yarn due to fluctuations in the yarn physical properties such as the thickness of the yarn and the size of the fluff in the length direction of the weft.

In particular, since the flying characteristics of the weft constituting the yarn feeder gradually change inside the yarn feeder serving as the supply source of the weft, 1
In the case of so-called yarn supply change, when the entire amount of the individual yarn supply is consumed and the weft is drawn from the new yarn supply,
Since the flight characteristics of the weft have discontinuous fluctuations in stages,
Technologies corresponding to this have been already proposed (for example, Japanese Patent Application Laid-Open No. 58-18446 and Japanese Utility Model Application Laid-Open No. 63-19341). All of these technologies assume that the flight characteristics of the weft fluctuate when changing the yarn supply, and actively change the injection pressure on the main nozzle and sub-nozzle for weft insertion to compensate for this. And a stable weft insertion operation.

In addition, the flight period required for the inserted weft to reach the non-weft insertion side of the woven fabric (hereinafter simply referred to as the flight period)
A method of controlling the injection pressure of a main nozzle or the like so as to grasp the fluctuation of the flight characteristics of the weft by monitoring the fluctuation of the weft and to keep the fluctuation constant is also considered.

In addition, the sudden fluctuation of the flight characteristics of the weft as described above,
Not only in the case of yarn supply change, but also in the case of weaving using the so-called large package, which combines one weft obtained from a plurality of packages into one large-sized yarn supply body and supplies the weft from now on It occurs every time a weft knot passes.

However, in the related art, since the injection pressure of the main nozzle and the like is changed in order to cope with the fluctuation of the flight characteristics of the weft, the responsiveness is insufficient, and Although it is good for slow fluctuations in flight characteristics, there is a problem that looms can not be stopped due to poor weft insertion, because it can not cope with stepwise fluctuations in flight characteristics due to yarn feed change etc. Was. In addition, when the loom is stopped due to a poor weft insertion, a restarting operation is complicated because the operation of repairing the defective weft is involved, which often causes a stop stage.

This is exactly the same when controlling the injection pressure by monitoring the flight period. Also, in this case, if the loom stops due to poor weft insertion, the weft does not normally reach the reverse weft insertion side, making it impossible to grasp the flight characteristics of the new weft. It is not uncommon for the loom to be unable to restart due to the loss of the means for setting it correctly.

Therefore, an object of the present invention is to solve the problem of the related art and, when using the injection pressure control, when a sudden change in the flight characteristics of the weft is predicted, the loom is temporarily stopped and the pressure correction unit is reset. Accordingly, it is an object of the present invention to provide a weft insertion control device for a loom, which can resume the operation of the loom without any trouble for a new weft whose flying characteristics have changed.

Means for Solving the Problems To achieve the above object, a configuration of the present invention includes a pressure controller for controlling an injection pressure of a weft insertion nozzle, a timing controller for controlling an operation timing of a weft insertion member, and a weft flight. A pressure correction unit that outputs a pressure correction amount corresponding to a change in the characteristic to the pressure controller, a reset unit that includes a prediction unit that predicts a sudden change in the flight characteristics of the weft, and sends a reset signal to the pressure correction unit; The loom control device stops the loom in response to the loom stop signal from the section, and automatically restarts the loom after waiting for the response time of the pressure controller.

Note that the prediction means may be a yarn feed change sensor or a knot sensor provided outside the reset unit, and further, a comparator built in the reset unit, wherein the comparator is
It may be detected that the pressure correction amount from the pressure correction unit has exceeded the limit value.

In addition, the timing controller can be provided with an angle correction unit that outputs an angle correction amount according to the fluctuation of the weft flight characteristics.

In the case of the structure of the invention, during weaving,
If the flight characteristics of the weft inside the yarn feeder fluctuates slowly due to reasons other than yarn feed change or knot passing, the injection pressure correction operation is performed by outputting the pressure correction amount from the pressure correction unit to the pressure controller. It is.

At the time of yarn supply change or the like, since the weft inserted is switched, the flight characteristics of the weft suddenly change stepwise. Therefore,
The reset unit predicts a sudden change in the flight characteristics of the weft through the prediction unit, sends a reset signal to the pressure correction unit, and sends a loom stop signal to the loom control device to stop the loom. At the same time, the pressure correction amount from the pressure correction unit is reset to zero level by the reset signal, and the injection pressure from the main nozzle and the like can be returned to the normal set injection pressure.

Generally, the flight characteristics of the weft gradually change in one direction from the outer layer portion to the inner layer portion of the yarn feeder. For example, when the yarn supply is changed, the flight characteristics are at a level corresponding to the inner layer portion. Suddenly changes to the level corresponding to the outer layer. Therefore, if the injection pressure is set in advance to a level suitable for the flight characteristics of the level corresponding to the outer layer portion, the weft insertion at the time of restarting the loom will be compatible with the flight characteristics and the injection pressure. And can be performed normally. In addition,
The stoppage of the loom in this case is for securing the response time of the pressure controller, and is not due to a poor weft insertion. Therefore, when the loom is automatically restarted after waiting for the response time of the pressure controller, no complicated repair work is required, and there is no possibility of occurrence of a stop step. Further, since the loom stop time at this time can be extremely short, a decrease in the loom operating rate can be ignored.

When the prediction means is a yarn feed change sensor, it is possible to cope with a sudden change in the flight characteristics due to yarn feed change. When the knot sensor is a knot sensor, when wefts with different flight characteristics are connected via a knot, it is possible to deal with sudden changes in the flight characteristics due to the passage of the knot. It is effective when doing.

When the prediction means is a comparator that detects an excessive pressure correction amount, the increase in the pressure correction amount indirectly indicates the approach of the weft switching timing, so by appropriately selecting the limit value of the pressure correction amount. , Both when changing yarns or when using a large package.

If you add an angle correction unit to the timing controller,
In order to cope with fluctuations in flight characteristics, control of a responsive start angle (hereinafter referred to as the loom machine angle at which weft insertion starts) will be used together to achieve better control. Can be.

Embodiments Hereinafter, embodiments will be described with reference to the drawings.

The weft insertion control device of a loom mainly includes a pressure controller 10, a timing controller 20, a pressure correction unit 30, an angle correction unit 40, and a reset unit 60 (first unit).
Figure).

The loom shall be an air jet loom (No. 2
FIG.), The weft W unwound from the yarn supplying body W1 is inserted into the warp opening WP via a drum type weft length measuring and storing device (hereinafter simply referred to as a storing device) D and a main nozzle MN. Also, along the traveling path of the weft W, the sub-nozzles SNi, SNi.
a, b... n) are divided into a plurality of groups and arranged. However, the start of winding of the yarn supplying body W1 is connected to the end of winding of the spare yarn supplying body W2, and when the entire amount of the former is consumed, the supply source of the weft W automatically shifts to the latter. I do. Further, in order to detect the occurrence of the yarn feed change at this time, a yarn feed change sensor is used as a predicting means for predicting a sudden change in the flight characteristics of the weft W.
The TS is provided outside the reset unit 60.

The storage device D is provided with a locking pin D1 and an unwinding sensor D2, and the weft W wound and stored around the drum D3.
Are the weft insertion signals Sd, S from the timing controller 20
The locking pin D1 is driven to the unwinding position via m, Ssi (i = a, b... n), and the on-off valves Vm, Vsi (i = a, b.
n) is opened, and the main nozzle MN and the sub-nozzles SNi, SNi. The weft insertion length Wn of the weft yarn W is measured by the unwinding sensor Dd.

The main nozzle MN and the sub-nozzles SNi, SNi ... share a common air source A via on-off valves Vm, Vsi, pressure regulating valves PVm, PVs, respectively.
C, and the injection pressures Pm and Ps are controlled by control signals Spm and Sps from the pressure controller 10, respectively. In addition, the weft W reaches the non-weft insertion side of the woven fabric in order to detect the arrival angle θe (meaning the mechanical angle of the loom when the inserted weft W reaches the non-weft insertion side, the same applies hereinafter) θe. An angle sensor ES is provided, and the loom machine angle θ from the encoder EN is also
Has been entered.

The pressure controller 10 includes a set injection pressure Po from an injection pressure setting device (not shown) and a pressure correction amount from the pressure correction unit 30.
Two control amplifiers for Pc and input point 11
12 and 12 are cascaded (FIG. 1), and the output is inputted to the pressure regulating valves PVm and PVs as control signals Spm and Sps. However, set injection pressure Po, pressure compensation amount Pc
Are input to the addition terminal and the subtraction terminal of the addition point 11, respectively. Here, the control yarns on the loom side for the sub-nozzles SNi, SNi... Are not shown.

The timing controller 20 has an addition point 21 and a controller main body 22 cascaded. A setting start angle θso from a start angle setting device (not shown) and an angle correction amount θc from the angle correction unit 40 are input to an addition terminal and a subtraction terminal of the addition point 21 respectively. The controller body 22 compares the command start angle θs = θso−θc from the addition point 21 with the loom mechanical angle θ from the encoder EN, and outputs the weft insertion signal S.
d, Sm, and Ssi are output, and weft insertion starts at the loom mechanical angle θ = θs. When the weft insertion length Wn from the unwinding sensor D2 reaches a predetermined value, the controller main body 22 completes the weft insertion. That is, the timing controller 20 controls the operation timing of the weft insertion member including the locking pin D1, the main nozzle MN, the sub nozzles SNi, SNi,.

The pressure correction unit 30 and the angle correction unit 40 are provided before the pressure controller 10 and the timing controller 20, respectively (FIGS. 1 and 2).

The pressure correction unit 30 includes an addition point 31 and a pressure correction means 32. A set flight period τo from a flight period setting device (not shown) is input to the former addition terminal, and a flight is performed to the subtraction terminal. The flight period τ of the weft W from the period calculating means 51 is input. The pressure correction means 32 includes a PID control element, and can input the flight period deviation Δτ = τo−τ from the addition point 31, calculate the pressure correction amount Pc, and output it to the pressure controller 10. In addition, the flight period calculation means 51
A command start angle θs from the timing controller 20;
The arrival angle θe from the arrival angle sensor ES is input, and the flight period τ = θe−θs of the weft W in units of the loom mechanical angle θ.
Is calculated.

The angle correction unit 40 includes an addition point 41 and an angle correction unit 42. The addition point 41 inputs a set arrival angle θeo from a not-shown arrival angle setting device and an arrival angle θe of the weft W, and outputs an arrival angle deviation Δθe = θeo−θe. , The arrival angle deviation Δθe,
After an appropriate PID calculation, the angle correction amount θc is output to the timing controller 20.

The yarn feed change signal St from the yarn feed change sensor TS is input to the reset unit 60. One output of the reset unit 60 is
The loom control signal CS is input to the loom control device CS as a loom stop signal Stp, and the other output is guided to the pressure correcting means 32 of the pressure correcting unit 30 as a reset signal Sr. However, the loom control unit CS
When the loom stop signal Stp is input, the operating loom is automatically stopped, and the pressure correcting means 32
It is assumed that the pressure correction amount Pc is reset to a zero level.
In addition, the reset unit 60 at this time includes a time delay element (not shown), and may output the loom stop signal Stp and the reset signal Sr after an appropriate delay time td from the generation of the yarn feed change signal St. Is, for example, a yarn feed change sensor TS
The operation is set in accordance with the time delay from when the weft W from the new yarn supplying body W2 is actually inserted into the weft.

Now, when the weft insertion operation is normally performed, the weft W is controlled by the timing controller 20 to the loom mechanical angle θ.
= Θso, weft insertion starts, and reaches θ-θeo on the side opposite to weft insertion. That is, the arrival angle θ at this time
Since e = θeo, the arrival angle deviation Δθe = θeo−θe
= 0, and therefore the angle correction amount θc from the angle correction unit 40 is zero.

At this time, the flight period of the weft W is τ = τo,
Therefore, the pressure correction amount Pc from the pressure correction unit 30 is zero. Therefore, pressure controller 10, pressure regulating valve PVm, PVs
Main nozzle MN, sub-nozzle SNi, SNi realized by ...
Are also Pm = Ps = Po.

When the flight characteristics of the weft W decrease in accordance with the consumption of the yarn supplying body W1, the flight period τ> τo of the weft W is satisfied, and the arrival angle θe is later than the set arrival angle θeo, and θe> θeo. Therefore, the addition point 41 of the angle correction unit 40 is the arrival angle deviation Δ
θe = θeo−θe <0 is output to the angle correction means 42. The angle correction means 42 determines that θc = f (Δθe)> 0 (where f
Calculates the angle correction amount θc as a control function including part or all of the PID element and outputs the angle correction amount θc to the timing controller 20, so that the timing controller 20 uses the angle correction amount θc By starting the weft insertion at the command start angle θs = θso−θc <θso, the reaching angle deviation Δθe can be quickly removed.

On the other hand, the flight period calculation means 51 calculates the flight period τ at this time.
> Τo to the pressure correction unit 30, so that the addition point 31 of the pressure correction unit 30 outputs the flight period deviation Δτ = τo−τ <0 to the pressure correction unit 32. The pressure compensating means 32 calculates Pc = g
Since the pressure correction amount Pc is calculated as (Δτ) <0 (where g is a control function including part or all of the PID element) and is output to the pressure controller 10, the pressure controller 10
, A correction is made to the set injection pressure Po in a direction in which the flight period deviation Δτ is eliminated to obtain a command injection pressure P, which is output to the pressure regulating valves PVm and PVs via the control amplifiers 12 and 12. That is, when the flight period deviation Δτ <0, the correction direction is selected so that P> Po. Then pressure regulating valves PVm, PVs
Is the injection pressure Pm of the main nozzle MN, sub-nozzles SNi, SNi ...
Ps is modified so that Pm = Ps = P> Po.

By correcting the injection pressures Pm and Ps in this way, the flight period τ can be corrected to the set flight period τo. Here, the responsiveness of the pressure controller 10 including the pressure regulating valves PVm and PVs is usually much slower than that of the timing controller 20, so that as the flight period τ is corrected, the angle correction unit 40 By maintaining the reaching angle θe at the set reaching angle θeo, the command start angle θs is returned to the setting start angle θso. That is, the command start angle θs is the injection pressure by the pressure controller 10.
It is possible to return to the setting start angle θso so as to follow the correction of Pm and Ps, and finally, the injection pressures Pm and Ps become Pm =
Ps is corrected to P, and correspondingly, the command start angle θs
Can return to θs = θso.

The overall operation when the flight characteristics of the weft W become higher, shift in the direction of the arrival angle θe <θeo, and when the flight period τ <τo, is the reverse of the above description. Pm,
As for Ps, Pm = Ps = P <Po is achieved, and the command start angle θs returns to θs = θso.

When the fluctuation of the flight characteristics of the weft W is slow,
Since the pressure controller 10 can respond sufficiently,
In the above control process, the arrival angle deviation Δθe, the flight period deviation Δτ, and the angle correction amount θc are kept at extremely small values.

When the entire amount of the yarn supply body W1 is consumed and the yarn supply is changed, the yarn change signal St is generated from the yarn change sensor TS, and the reset unit 60 operates. Now, assuming that the weft W from the inner layer portion of the yarn feeders W1 and W2 has good flight characteristics as compared with that from the outer layer portion, the flight characteristics of the weft W are changed by changing the yarn feed. It changes suddenly stepwise in the direction in which the flight period τ is extended. On the other hand, by this time, the pressure correcting means 32
Since the pressure correction amount Pc> 0 is operated so as to gradually increase in accordance with the flight characteristics that gradually become better with the consumption of W1, the pressure correction amount Pc is generated at the time when the yarn feed change signal St is generated.
Has increased to a certain value.

Then, when the yarn feed change signal St is generated, the reset unit 60
After the delay time td, the loom stop signal Stp and the reset signal S
Since r is output, the loom is stopped by the former, and at the same time, the pressure correction amount Pc from the pressure correction means 32 is reset to zero level by the latter, and the pressure controller 10
It operates to return the injection pressures Pm and Ps to the set injection pressure Po. Therefore, when the loom is restarted after the necessary and sufficient stop time, the weft W at that time is from the new yarn supplying body W2 due to the yarn supply change, and the injection pressure Pm,
Since Ps is set to the set injection pressure Po suitable for it, subsequent weft insertion can be performed smoothly. The same is true for the case where the flying characteristics of the weft yarn W inside the yarn feeders W1 and W2 have opposite fluctuation characteristics, in which case the reset signal is output.
Pressure compensation amount Pc that has increased to a certain level due to Sr
<0 will be reset to zero level.

Other Embodiments The reset section 60 can be formed by the operation timing determining means 62 (FIG. 3). The operation timing determination means 62 outputs a loom stop signal Stp and a reset signal Sr when a predetermined number of picks np is input after the generation of the yarn feed change signal St. The number of picks np can be measured using a pick signal Sp from a pick sensor (not shown) that detects a beating motion. Note that the pick signal Sp may be obtained from a sensor that detects the momentum of any moving member including the main shaft of the loom. Number of picks np corresponding to delay time td in the previous embodiment
Is set in the operation timing determination means 62, the loom stop signal Stp
When restarting the loom stopped by the new yarn feeder
The weft W from W2 is reliably inserted.

The reset unit 60 includes a comparator 63 for inputting the pressure correction amount Pc and the limit value Pco, and a setter 64 for setting the limit value Pco.
(FIG. 4), and the comparator 63 built in the reset unit 60 can be used as a prediction unit. The reset section 60 generally operates when a sudden change in the flight characteristics of the weft W is predicted, and the loom stop signal Stp and the reset signal Sr
Is output, the pressure correction amount Pc is output via the comparator 63.
Is detected to exceed the limit value Pco, it is possible to accurately determine the operation timing.

The yarn feed change sensor TS in FIGS. 1 and 2 is a yarn feeder.
In the middle of W1 and W2, knot of weft W connecting both
The knot sensor TN for detecting Wn may be replaced (two-dot chain line in FIG. 5). Knot detection signal Sn from knot sensor TN
Can be used in exactly the same way as the yarn feed change signal St. Further, the knot sensor TN may be provided on the outlet side of the yarn supplying body W1 (solid line in the figure). It is possible to cope well with a case where the yarn supplying body W1 is a large package and contains a plurality of wefts W, W... Having different flight characteristics through a plurality of knots Wn, Wn.

In each of the above embodiments, when the loom is automatically stopped by the loom stop signal Stp from the reset unit 60, unlike the case where the loom is stopped due to a general weft insertion failure, the loom is restarted without any special repair work. Can be done. That is, the loom controller CS automatically resets the loom after waiting for a stop time sufficient for the pressure correction amount Pc to be reset and the injection pressures Pm and Ps to return to the set injection pressure Po, that is, a response time of the pressure controller 20. It may be restarted. In this case, if an appropriate automatic weft discharge mechanism is provided and an appropriate amount of the weft W is discharged out of the loom after the loom is stopped, a delay time td is provided in the reset unit 60 or the number of picks np
Can be reliably switched to the one having the new flight characteristics even if the weft W is inserted at restart.

The injection pressure of the main nozzle MN, sub-nozzles SNi, SNi ...
Although Pm = Ps = P always holds for Pm and Ps, Pm = aPs ≠ Ps (a is a constant other than 1) by interposing an appropriate ratio setting element on the input side of the control amplifiers 12 and 12, for example. )
It may be. The pressure regulating valve PVs is connected to the sub nozzle SN
i, SNi... may be arranged for each group, and a different injection pressure may be realized for each group. That is, the injection pressure of each weft insertion nozzle composed of the main nozzle MN and the sub-nozzles SNi, SNi... Is determined as a whole, or the main nozzle MN alone, or the sub-nozzles SNi, SNi. hand,
It can be controlled by the pressure controller 10.

Further, the overall control system shown in FIG. 1 including the pressure correction unit 30, the angle correction unit 40, and the reset unit 60 can be realized by any of an analog system and a digital system. It can be operated in response to a pick operation. In the latter case, the flight period deviation Δτ and the arrival angle deviation Δθe are calculated for each pick based on the moving average values of the flight periods τ, τ, and the arrival angles θe, θe. Alternatively, it may be calculated for each fixed number of picks based on the average value of the fixed number of picks.

In FIG. 1, the set flight period τo may be calculated as τo = θeo−θso instead of being obtained from a flight period setting device (not shown). The set flight period τo and the flight period τ may be time parameters instead of angle parameters. At this time, the flight period calculating means 51
The time difference from the command start angle θs to the arrival angle θe is measured, and the set flight period τo is set to a value corresponding to the time required for the normal flight of the weft W.

In the present invention, the angle correction unit 40 may use the flight period deviation Δτ instead of the arrival angle deviation Δθe, and the pressure correction unit 30 may calculate the arrival angle deviation Δθe instead of the flight period deviation Δτ. May be used. The angle correction unit 40
May be deleted. In that case, the timing controller 20 always starts weft insertion at the command start angle θs = θso.

Further, the timing controller 20 determines the loom machine angle θ
= Θs, the operation of the weft insertion member composed of the main nozzle MN, the sub-nozzles SNi, SNi..., And the locking pin D1 is started, but if necessary, an appropriate time difference may be provided in the operation timing of these weft insertion members. . That is, the main nozzle MN may be operated before the operation of the locking pin D1 by a predetermined time, or vice versa.

As described above, according to the present invention, the pressure controller is provided with the pressure correction unit, and the reset unit having the prediction unit that predicts a sudden change in the flight characteristics of the weft is provided. When the flight characteristics of the weft change gradually, the controller corrects the injection pressure of the weft insertion nozzle via the pressure correction unit to adapt to the change, while suddenly changing the flight characteristics due to yarn supply change, etc. With respect to, the loom can be stopped by the reset unit and the pressure correction amount from the pressure correcting unit can be reset, so that when the loom is restarted, the injection pressure is surely adapted to the flight characteristics of the new weft. Therefore, there is an excellent effect that the operation of the loom can be continued without any trouble.

[Brief description of the drawings]

1 and 2 show an embodiment, FIG. 1 is an overall system diagram,
FIG. 2 is a conceptual diagram of the overall configuration. FIG. 3 to FIG. 5 are main part system diagrams showing different embodiments. W: Weft Pm, Ps: Injection pressure Sr: Reset signal Stp: Loom stop signal Pc: Pressure correction amount Pco: Limit value θc: Angle correction amount CS: Loom control unit TS: Yarn feed Replacement sensor TN Knot sensor 10 Pressure controller 20 Timing controller 30 Pressure compensation unit 40 Angle compensation unit 60 Reset unit 63 Comparator

Claims (5)

(57) [Claims] 1. A pressure controller for controlling an injection pressure of a weft insertion nozzle, a timing controller for controlling an operation timing of a weft insertion member, and a pressure correction amount corresponding to a change in flight characteristics of a weft yarn, output to the pressure controller. Pressure corrector, and a prediction means for predicting a sudden change in the flight characteristics of the weft,
A reset unit that sends a reset signal to the pressure correction unit; and a loom control device that stops the loom by a loom stop signal from the reset unit, and automatically restarts the loom after waiting for a response time of the pressure controller. Weaving control device for loom. 2. A weft insertion control device for a loom according to claim 1, wherein said prediction means is a yarn feed change sensor provided outside said reset section. 3. The weft insertion control device for a loom according to claim 1, wherein said prediction means is a knot sensor provided outside said reset section. 4. The apparatus according to claim 1, wherein the predicting means is a comparator built in the reset unit, wherein the comparator detects that a pressure correction amount from the pressure correction unit has exceeded a limit value. The weft insertion control device for a loom according to claim 1, wherein 5. The timing controller according to claim 1, wherein said timing controller is provided with an angle correction section for outputting an angle correction amount corresponding to a change in flight characteristics of the weft. The weft insertion control device for a loom according to any one of the above.