JPH0382849A - Control device for weft inserting of weaving machine - Google Patents

Abstract

PURPOSE:To continue stable weft inserting by combining a pressure controller with a pressure compensation part, a timing control part with an angle correction part, respectively and carrying out correction control of starting angle and tracking control of jet pressure in abrupt change of weft moving characteristics. CONSTITUTION:In a weft inserting control of jet loom, a pressure controller to regulate jet pressure of weft inserting nozzle and a timing controller to regulate operation period of weft inserting member are set, the pressure controller is combined with a pressure correction part and an angle correction part to work during signal of filling yarn change with the timing controller. Against variability of weft moving characteristics during weft inserting, jet pressure of nozzle is corrected based on the variability in the case except the filling yarn change. The starting angle is subjected to feedforward control in the angle correction part and the jet pressure is subjected to tracking control in the pressure correction part in the case of variability following the filling yarn change to constitute the control device to response all variations of weft moving characteristics.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a weft insertion control device for a loom for continuing stable weft insertion operation even when weft flight characteristics vary in a jet loom.

In conventional jet looms, particularly in air jet looms, weft insertion may become unstable due to changes in the flying characteristics of the weft yarns used in weaving. The main reason for this is thought to be that the air resistance of the yarn changes due to variations in the physical properties of the yarn, such as the thickness of the yarn and the size of fluff, in the length direction of the weft.

In particular, inside the yarn supplying body which is the supply source of weft yarns, the flight characteristics of the weft yarns constituting the yarn supplying body gradually change, so one of the yarn supplying bodies is consumed and the weft is transferred to a new yarn supplying body. It has been observed that during so-called yarn feeding change, when the yarn is pulled out from the weft yarn, a stepwise discontinuous change occurs in the flight characteristics of the weft yarn.
Techniques corresponding to this have already been proposed (for example, Japanese Unexamined Patent Publication No. 18446/1983, Publication of Utility Model Publication No. 1983).
, Publication No. 9341).

All of these technologies assume that the flying characteristics will fluctuate when changing the yarn feed, and actively change the injection pressure to the main nozzle and sub nozzle for weft insertion to eliminate this fluctuation. This is intended to continue stable weft insertion.

In addition, by monitoring the loom mechanical angle at which the inserted weft reaches the opposite side of the woven fabric (hereinafter referred to as the arrival angle of the weft), we can grasp fluctuations in the flying characteristics of the weft and keep it constant. In order to maintain Some devices are designed to cope with discontinuous fluctuations in flight characteristics by forcibly pulling back to a predetermined value (Utility Model Application Publication No. 36379).

Problems to be Solved by the Invention However, in the former case of the prior art, the injection pressure of the main nozzle, etc. is changed in order to cope with fluctuations in flight characteristics, so the response is insufficient. However, there was an unavoidable problem that it was impossible to cope with gradual changes in flying characteristics caused by yarn feeding changes. In addition, in the case of the latter, the changes in the starting angle are sufficiently correlated, so there is no problem with responsiveness, but since the injection pressure remains constant, the flight characteristics may further fluctuate for some reason. As a result, the starting angle is excessively shifted, and the relative temporal balance with the warp shedding is disrupted, so that if the warp is caught, there is a risk of weft insertion defects such as weft breakage.

SUMMARY OF THE INVENTION In view of the problems of the prior art, an object of the present invention is to use injection pressure control and start angle control in combination, and to perform feedforward control on the latter during yarn feeding changes, so that the flying of weft yarns can be improved. In addition to dealing with sudden changes in characteristics, the former can respond well to all fluctuations in flying characteristics, including gradual fluctuations due to yarn feeding changes, by following the latter. ,Moreover,
It is an object of the present invention to provide a weft insertion control device for a loom that is free from the possibility of occurrence of defective weft insertion due to disruption of the temporal equilibrium relationship with the warp shedding.

Means for Solving the Problems The present invention has a configuration in which a pressure controller for controlling the injection pressure of the weft insertion nozzle, a timing controller for controlling the activation timing of the weft insertion member, and a pressure controller for achieving the above object are provided. The timing controller includes an attached pressure correction section and an angle correction section attached to the timing controller. The gist of this system is to output an angle correction amount according to a predetermined pattern to the evening/first mixing controller when there is a yarn feed change signal.

Note that the angle correction section may include a function generator that generates a predetermined angle correction amount according to the elapsed time after generation of the yarn feed change signal, and the actual elapsed time itself may be used as the elapsed time. However, it can also be measured by the number of picks in the weaving operation of the loom. Furthermore, the angle correction amount may be generated in a predetermined pattern according to the winding diameter of the yarn supplying body.

Further, a limiter element may be interposed at the input end of the timing controller, a dead band element may be interposed at the input side of the pressure controller, and the timing controller may be provided with a limiter element at the input end of the pressure controller. It is also possible to add an angle correction section that outputs an angle correction amount according to the fluctuation.

With this configuration, when the flying characteristics of the weft yarn change due to causes other than yarn feeding changes, the pressure correction section sends a pressure correction amount based on the fluctuation in the flying characteristics of the weft yarn to the pressure controller. By doing so, the injection pressure of the main nozzle etc. is corrected.

When changing the yarn feed, the yarn feeder is switched, so the flying characteristics suddenly change step by step. Therefore, when a yarn feed change is detected by the yarn feed change signal, the angle correction section outputs to the timing controller an angle correction amount corresponding to the variation width of the flight characteristics at that time, and corrects the starting angle. The amount of correction of the starting angle at this time is made by the yarn feed change signal, so it can be reliably applied even when the weft from the new yarn feeder is inserted for the first time after the yarn feed change. Feedforward control can be performed.

Since the angle correction iTE ffi then slowly returns to the zero level according to a predetermined pattern, the pressure correction section and the pressure controller can sufficiently follow changes in this angle correction amount and correct the injection pressure. As a whole, it is possible to cope well with fluctuations in flying characteristics due to yarn feeding changes.

Generally speaking, the angle correction unit generates an angle correction amount that corresponds to the fluctuation range of the weft flight characteristics due to the yarn feeding change when the yarn feeding change signal is generated. It is sufficient if the angle correction amount is gradually returned to the zero level so that the pressure controller can follow the adjustment. Here, since the change pattern of the angle correction amount should depend on the elapsed time after the generation of the yarn feed change signal,
In addition to using the elapsed time itself, by using the number of picks of the loom and the winding diameter of the yarn supplying body, it is possible to realize accurate control of the -layer.

If a limiter element is installed at the input end of the timing controller, even when a large angle correction amount or angle correction amount occurs, it is possible to prevent the command start angle from shifting excessively, and the difference between the warp shedding and the warp shedding can be prevented. There is no risk of losing temporal equilibrium.

Further, by interposing a dead band element at the input end of the pressure controller, the response of the pressure controller to a small amount of pressure correction can be eliminated, and unnecessary wear and tear on mechanical parts such as the pressure regulating valve can be reduced.

If an angle correction section is attached to the timing controller, this angle correction section sends the angle correction amount based on the fluctuation of the weft flight characteristics to the timing controller, and first, by changing the starting angle, the weft yarn is quickly adjusted. It is possible to correct the flying condition. At the same time, the pressure correction unit sends the pressure correction amount to the pressure controller, and the injection pressure is corrected.

The pressure controller at this time does not have a fast response, but it operates independently of the timing controller to achieve the injection pressure that matches the flying characteristics of the weft yarn, so the injection pressure ultimately , is corrected until it deviates in response to the variation in flight characteristics. As the injection pressure is corrected in this way, the angle corrector works in the direction of pulling the start angle back to the normal set start angle, and therefore, ultimately only the injection pressure causes fluctuations in the flight characteristics of the weft. This is corrected accordingly, and stable weft insertion operation can be continued using the normal set start angle and set arrival angle. Even if this angle correction section is provided, the angle correction section operates by grasping the flight characteristics of the weft that is actually inserted, so it cannot cope with the first weft insertion after a yarn feeding change. However, the angle correcting section can also respond to this first weft insertion in advance.

Example Examples will be described below with reference to the drawings.

The weft insertion control device for a loom includes a pressure controller 10, a timing controller 20, a pressure correction section 30, an angle correction section 40, and an angle correction section 60 as main components (
Figure 1).

The loom is assumed to be an air jet loom (Fig. 2),
The weft W unwound from the yarn supplying body W1 is inserted into the warp space I''WP via a drum-type weft length measuring and storage device (hereinafter simply referred to as storage device) D and a main nozzle MN. Also,
Along the travel path of the weft W, sub-nozzles SNi, SNi... (i=a, b...n) divided into a plurality of groups are arranged.

However, the winding start of the yarn supplying body W is connected to the winding end of the spare yarn supplying body W2, and when the entire winding amount of the former is consumed, the weft W supply source is automatically switched to the latter. shall be transferred to. Further, a yarn feeding change sensor TS is provided to detect the occurrence of yarn feeding change at this time.

The storage device has a locking pin D1 and an unwinding sensor D2.
” and is wound around the drum D3 and stored.
is the weft insertion signal Sd from the timing controller 20
% Sm, 5si (i=a, b...n),
While driving the locking pin DJ to the unwinding position, the on-off valve V
m s Vsi (i = a, bn) 1 Open the soil, main nozzle MN, sub nozzle SNi.

Weft insertion is performed by operating SNi..., and the weft insertion length Wn is measured by the unwinding sensor D2.

Main nozzle MN, sub nozzle SNi, SNi...
On-off valves Vm, Vsi, and pressure regulating valves PVm, respectively.
connected to a common air source AC via 5PVs,
Each injection pressure Pm5Ps is determined by the pressure controller 1.
It is controlled by control signals Spm and Sps from 0. Furthermore, an arrival angle sensor ES for detecting the arrival angle θe of the inserted weft yarn W is provided on the side opposite to the weft insertion side of the woven fabric, and furthermore, the loom mechanical angle θ from the encoder EN is timing controller) roller 20.

The pressure controller 10 has a summing point 11 for inputting a set injection pressure Po from an injection pressure setting device (not shown) and a pressure correction amount PC from a pressure correction section 30, and two control amplifiers 12, 12 connected in series. (Fig. 1), and its output is sent to the pressure nozzle J regulating valve PV as control signals Spm and Sps.
m, PVs are powered by humans. However, set injection pressure P O% pressure correction fi
P c is input to the addition terminal and the subtraction terminal of the addition point 1]-, respectively. Further, the control system on the loom side for the sub-nozzles SNi, SNi, . . . is not shown here.

The timing controller 20 includes a summing point 21 and a controller main body 22 connected in series.

The addition terminal and subtraction terminal of the addition point 21 have the following, respectively.
A setting start angle θso from a start angle setter (not shown) and an angle correction amount θC from the angle corrector 40 are input. The controller main body 22 compares the command start angle θS-θso-θC given from the summing 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 is started at θ-θS. Also, the weft insertion length Wn from the unwinding sensor D2
When becomes a predetermined value, weft insertion is completed. That is, the timing controller 20 locks the locking pin D1.
, main nozzle MN, sub-nozzles SNi, SNi, . . .

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

The pressure correction section 30 includes a summing point 31 and a pressure correction means 32.
The setting flight period τ0 from a flight period setting device (not shown) is input to the addition terminal of the former, while the flight period of the weft W from the flight period calculation means 51- is input to the subtraction terminal. The period τ has been input. The pressure correction means 32 is a PID
In addition, the flight period deviation Δτ−τ0−τ from the convergence point 31− is inputted, and the pressure correction iPc can be calculated and output to the pressure controller 1.0. In addition, the flight period calculation means 5 ]- is the command start angle θSθso −o c from the timing controller 20
and manually calculate the arrival angle Oe from the arrival angle sensor ES,
Flying period τ-θe- of the weft W in units of loom mechanical angle θ
It is assumed that θS is calculated and output.

The angle correction section 40 includes a summing point 41 and an angle correction means 42. Addition point 4] inputs the set arrival angle θ00 from the arrival angle setter (not shown) and the arrival angle θe of the weft W, and calculates the arrival angle deviation Δθe−θe.
While outputting o-θe, the angle correction means 42 inputs the arrival angle deviation Δθe, performs appropriate PID calculation, and outputs the angle correction amount θC to the timing controller 20.

The yarn feed change signal St from the yarn feed change sensor TS is input to the angle correction section 60. The output of the angle correction section 60 is
As the angle correction amount Oct, the timing controller 20
is input to another subtraction terminal of the addition point 21.

Now, when the weft insertion operation is being performed normally, the weft thread W is started to be inserted at the set start angle θso by the timing controller 20, and the weft thread W is inserted at the set start angle θe.
At o, the opposite weft insertion side is reached. That is, at this time, since the arrival angle is θe-θCO, the arrival angle deviation is Δθe-θeo-θe-0, and therefore, the angle correction amount θC from the angle correction section 40 is θC=O.

]-6 Also, at this time, the flight period τ of the weft W is τ−τ0, and therefore the pressure correction amount Pc from the pressure correction unit 30
Also, Pc=O. Therefore, pressure controller j roller 10
, the injection pressures Pm5Ps from the main nozzle MN, sub-nozzles SNi, SNi, . . . realized by the pressure regulating valves PVm5PVs also match the set injection pressure PO.

If the flight characteristics of the weft W deteriorate for some reason, the weft W
The flight period τ of is τ〉τ0 (Fig. 3),
The arrival angle θe is also delayed from the set arrival angle θeo, and θe〉
θeo. Therefore, the addition point 41 of the angle correction unit 40 detects the arrival angle deviation Δθe−θeo−θe<0, and outputs this to the angle correction means 42. The angle correction means 42 calculates that θc=f(Δθe)>O (where f is P
The angle correction amount θC is calculated as a control function (including some or all of the ID elements), and this is applied to the timing controller 2.
0, the timing controller 20 uses the angle correction amount θC given in this way to obtain the command start angle θS−θs.

- By starting weft insertion at 〈θSO,
The arrival 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.
〉Since τ0 is detected and outputted to the pressure correction unit 30, the addition point 31 of the pressure correction unit 30 is the flight period deviation Δ
τ-τ0-τ0 is output to the pressure correction means 32. The pressure correction means 32 calculates the pressure correction amount Pc as Pc=g(Δr)<0 (where g is a control function including some or all of the PID elements) and outputs it to the pressure controller 1.0. , the pressure J controller 10 corrects the set injection pressure Po in a direction that eliminates the flight period deviation Δτ, sets the result as the command injection pressure P, and controls the pressure regulating valve PVm via the control amplifier 12.12. , output to PVs. That is, when the flight period deviation Δτ<0, the direction of correction is selected so that P>P○. As a result, the pressure regulating valves PVm, PVs correct the injection pressures Pm, Ps from the main nozzle MN, sub nozzles SNi, SNi... so that Pm - Ps = P>Po.

By correcting the injection pressures Pm and Ps in this manner, the flight period τ can be corrected to the set flight period τ0. Here, since the response of the pressure controller 1o including the pressure regulating valve PVm 5PVs is normally much slower than that of the timing controller 2, as the flight period τ is modified, The angle correction section 4o is
By maintaining the arrival angle θe at the set arrival angle θeo, it works to pull the command start angle θS back to the set start angle θso. That is, the command start angle θS can be returned to the set start angle θsO in a manner that follows the correction of the injection pressures Pm and Ps by the pressure controller 10, and ultimately the injection pressures Pm and Ps are reliably adjusted. Pm=
Ps = P, and the command start angle θS can correspondingly return to θS - θso.

The flight characteristics of the weft W become high, and the arrival angle θe becomes θe.
When the flight period τ increases by τ1 and becomes τ0 due to deviation in the direction of eo, the overall operation is opposite to the above explanation, and finally, the injection pressures Pm and Ps are Pm = Ps
When =P<Po is achieved, the command start angle θS returns to θS−θso.

When the yarn feeding body W1 is consumed and the yarn feeding is changed, a yarn feeding change signal St is generated from the yarn feeding change sensor TS, and the angle correction unit 60 is activated. Now, assuming that the weft W from the inner layer part of the yarn supplying body W1 has better flight characteristics than that from the outer layer part of the yarn supplying body W2, the flight characteristics of the weft yarn W are as follows.
Due to the yarn feeding change, the flying period τ suddenly changes step by step in the direction of being extended. Therefore, the angle correction unit 60 has a slight time delay td after the generation of the yarn feeding change signal St.
After that, the angle correction amount θct−Δθct is generated, and from then on,
It is sufficient to use a function generator in which the angle correction amount oct returns to the zero level with the passage of time t (Fig. 4).
. The angle correction amount Oct is input to the addition point 2 of the timing controller 20, so the angle correction amount θc1
By setting the value of −Δθct according to the fluctuation range of the flight characteristics of the weft W, the command start angle θS−θso−θC−θct is set such that the arrival angle θe of the weft W is maintained at the set arrival angle θeo. can be corrected. Also, the pressure correction section 30 at this time
, pressure controller]-〇 operates to correct the injection pressures Pm and Ps in the direction of maintaining the flight period τ of the weft W at the set flight period τ0 in exactly the same manner as described above. In FIG. 4, the time delay td is from the time when the yarn feeding change sensor TS is activated to when the weft yarn W from the new yarn feeding body W2 is transferred.
is set so that it corresponds to the time difference until actual weft insertion. Further, the time Δt for returning the angle correction amount 0ct−Δθct to the zero level is set to be sufficiently long so that the pressure controller 10 can follow the angle correction amount 0ct−Δθct.

In this way, after the generation of the yarn feeding change signal St, the time Δt
(Strictly speaking, after time (td+Δ1)), the injection pressures Pm and Ps are higher than the set injection pressure Po by a pressure difference AP that corresponds to the range of variation in flying characteristics due to yarn feeding changes, and The angle correction amount θct has disappeared from the angle correction unit 60.

Therefore, the subsequent control shifts to the above-mentioned steady control, and stable weft insertion can be continued while dealing with fluctuations in flying characteristics due to consumption of new yarn feeder W2.

It goes without saying that when the direction of change in the flight characteristics of the weft W due to yarn feeding change is reversed, the sign of the angle correction amount OatΔθct may be reversed.

In the above explanation, the maximum value Δθc of the angle correction amount θcl
For example, t can be determined as follows. First, a trial weaving is performed with the yarn feeder W1 having a large diameter without activating the pressure correction unit 30, and the command injection pressure P is set to
PmPj (j=1.2...). At each command injection pressure Pj, the arrival angle θe is θe
If we find the command start angle θsj for -θeo, we get:
A relational expression between the starting angle θsj and the injection pressure Pj can be determined.

Therefore, in the case of wooden edges, the pressure correction section 30 is activated, and when the injection pressure Pa that becomes θe - θeo is obtained immediately before the yarn feeding change, the corresponding starting angle θsa is determined with reference to the above-mentioned relational expression. may be determined as Δθct-θSa-θSO. However, the injection pressure Pj at the stage of trial weaving
The relational expression between and the starting angle θsj may be obtained automatically using the angle correction unit 40, or may be obtained manually without trial.

Note that the maximum value Δθct is the injection pressure Pa immediately before yarn feeding change.
When is constant, a constant may be sufficient; however, when there is a possibility that injection pressure Pa may vary, a function generator (not shown) that stores a relational expression of starting angle θsj with respect to injection pressure Pj is provided in angle correction section 60. It is preferable that the maximum value Δθct can be variably set by manually inputting the command injection pressure P=Pa immediately before yarn feeding change to this function generator.

Another Embodiment The angle correction unit 60 is formed by a function generator 62 that is activated by the generation of the yarn feed change signal St and outputs an angle correction amount θct according to a predetermined pattern in response to the subsequent pick number np of the loom. (Figure 5). The pick number np is the pick signal S from a pick sensor (not shown) that detects the beating motion 3.
It can be measured using p. Note that the pick signal Sp may be obtained from a sensor that detects the amount of motion of any other moving member including the main shaft of the loom.

The angle correction unit 60 includes winding diameter sensors R, SL, and R32 facing the yarn supplying bodies Wl and W2, and detects the yarn supplying bodies Wi in use.
It may be a function generator 64 that outputs the angle correction amount Oct in a predetermined pattern corresponding to the winding diameter Rvt (i=1.2) (FIG. 6). Here, the yarn feed change signal St from the yarn feed change sensor TS is input to the switch 63 interposed between the winding diameter sensors R31, R32 and the function generator 64, The winding diameter Rw of the thread body Wi can be selectively supplied to the function generator 64.

In each of the above embodiments, the angle correction amount θct may slowly return to the zero level after the yarn feeding change signal St is generated and before the entire amount of the new yarn feeding body Wi is consumed. Furthermore, when it is known that the change in flight characteristics inside the yarn supplying body Wi draws a constant curve with respect to the winding diameter Rw4,
The angle correction amount oct is an arbitrary 11I that fits this curve.
It may be made to change along the I line.

The angle correction amount θC from the angle correction unit 40 and the angle correction unit 6
The angle correction amount θct from 0 may be supplied to the timing controller 20 via the summing point 52 and the limiter element 53 (FIG. 7). Command start angle θS
It is possible to eliminate the possibility that the warp shedding will be excessively shifted and the timing balance with the warp shedding will be lost.

A dead band element can also be interposed between the pressure correction unit 30 and the pressure controller ]-0, and according to this,
Since the deadband element can prevent the minute pressure correction IPc within its deadband width from being sent to the pressure controller], the pressure controller 1
0 and the attached pressure regulating valves PVm and PVs are,
It is possible to reduce the chances of performing unnecessary minute movements.

In the following explanation, main nozzle MN, sub nozzle SN
The injection pressures Pm and Ps of i, 5Ni- are always P m
= Ps-P holds, but this can be done, for example, by inserting an appropriate ratio setting element at the input terminal of 2.12 on the control amplifier, as Pm=aPs (a is a constant that is not 1). , injection pressure Pm, Ps may be different.

Moreover, the pressure regulating valve PVs is a sub nozzle SNi.

It may be arranged for each group of SNi... and achieve a different injection pressure for each group. In other words, the injection pressure of each weft inserting nozzle consisting of the main nozzle MN, sub nozzles SNi, SNi, etc. is collectively as follows:
Or only main nozzle MN or sub nozzle SN
i5SNi... can be divided into arbitrary groups and can be controlled by the pressure controller 10.

Also, a pressure correction section 30, an angle correction section 40, an angle correction section 6
The overall control system shown in FIG. 1 including 0 can be realized by either an analog system or a digital system, and especially when using the latter, it can be operated in response to the pick operation of the loom. Furthermore, in the latter case, the flight period deviation Δτ and the arrival angle deviation Δθe are the flight period τ, τ..., the arrival angle θe1θe, etc. in multiple pick operations.
It may be calculated for each pick based on the moving average value of , or it may be calculated for each fixed number of picks based on the average value of a fixed number of picks.

In FIG. 1, the set flight period τ0 is obtained from a flight period setting device (not shown), but the set arrival angle θ
An angular difference obtained by subtracting the setting start angle θso from eo may be used. Further, although the set flight period τ0 and the flight period τ are angle parameters, they may be replaced by time parameters.

At this time, the flight period calculation means 51 calculates the command start angle θS
We will measure the time difference from to the arrival angle θe,
Further, the set flying period τO is set to a value corresponding to the time required for normal flying of the weft W. In addition, the pressure correction section 3
0, the arrival angle θe may be used as a feedback signal instead of the flight period τ.Similarly, the angle correction unit 4
For o, flight period τ may be used instead of arrival angle θe.

In addition, in this invention, the angle correction section 40 may be omitted, and in that case, the timing controller 2 may be omitted.
0 means that the command start angle O8 is controlled by only the set start angle θso and the angle correction amount Oct.

Further, the timing controller 20 controls the loom mechanical angle θ
At the moment when the command start angle O8 coincides with the command start angle O8, the main nozzle MN
, sub nozzle SNi, SNi... and locking bottle D
The operation of the weft insertion member consisting of 1 was started, but
If necessary, the operation timings of these weft inserting members may be set at an appropriate time difference. That is, the main nozzle M
N may be activated, or vice versa.

As described in detail, according to the present invention, a pressure controller and a timing controller are provided, a pressure correction section is combined with the pressure controller, and an angle correction section that operates when there is a yarn feed change signal is provided. 8. When changes occur in the flying characteristics of the weft yarn other than when changing the yarn feeding, the injection pressure of the weft inserting nozzle can be corrected based on the fluctuation in the flying characteristics. To deal with sudden changes in flying characteristics, feedforward control of the starting angle by the angle correction unit and follow-up control of injection pressure can be used together, so it is possible to prevent sudden changes in flying characteristics, including when changing the yarn feed. This has an excellent effect in that stable weft insertion operation can be continued.

[Brief explanation of drawings]

1 to 4 show an embodiment, in which FIG. 1 is an overall system diagram, FIG. 2 is a conceptual diagram of the overall configuration, and FIGS. 3 and 4 are diagrams for explaining operation. 5 to 7 are main part system diagrams showing different embodiments, respectively. W... Weft Pm, Ps... Injection pressure St...
Yarn feed change signal Pc...Pressure correction amount θC...Angle correction amount Oct...Angle correction amount 10...Pressure controller 20...Timing controller 30...Pressure correction section 40...Angle correction Section 53...Limiter element 60...Angle correction section 62.64...Function generator

Claims (1)

[Scope of Claims] 1) A pressure controller that controls the injection pressure of the weft insertion nozzle, a timing controller that controls the operation timing of the weft insertion member, a pressure correction section attached to the pressure controller, and a pressure correction section attached to the timing controller. and an angle correction unit that outputs a pressure correction amount to the pressure controller in accordance with fluctuations in the flight characteristics of the weft yarn, and the angle correction unit outputs a pressure correction amount according to fluctuations in the flight characteristics of the weft yarn, while the angle correction unit outputs a pressure correction amount according to a change in the flight characteristics of the weft yarn, and when there is a yarn feeding change signal, A weft insertion control device for a loom, characterized in that an angle correction amount according to a predetermined pattern is output to the timing controller. 2) The weft insertion control for a loom according to claim 1, wherein the angle correction section includes a function generator that generates a predetermined angle correction amount according to the elapsed time after generation of the yarn feed change signal. Device. 3) The weft insertion control for a loom according to claim 1, wherein the angle correction section includes a function generator that generates a predetermined angle correction amount according to the number of picks after the yarn feed change signal is generated. Device. 4) The loom according to claim 1, wherein the angle correction section comprises a function generator that generates a predetermined angle correction amount according to the winding diameter of the yarn feeder after the yarn feed change signal is generated. weft insertion control device. 5) The weft insertion control device for a loom according to any one of claims 1 to 4, characterized in that a limiter element is interposed on the input side of the timing controller. 6) The weft insertion control device for a loom according to any one of claims 1 to 5, characterized in that a deadband element is interposed on the input side of the pressure controller. 7) The timing controller is provided with an angle correction section that outputs an angle correction amount according to fluctuations in the flight characteristics of the weft yarn.
A weft insertion control device for a loom according to any one of paragraphs.