JPH0693534A - Apparatus for controlling weft-insertion in jet loom - Google Patents

Abstract

PURPOSE:To surely introduce a weft into a holding pipe and keep the weft tension to a proper level by stopping an auxiliary nozzle at the side of weft insertion terminal and actuating a stretch nozzle when the tip of the weft is estimated to come in the acting range of the stretch nozzle. CONSTITUTION:A weft Y is inserted by the ejecting action of a weft-insertion main nozzle 4 and auxiliary nozzle groups 5-8 of a jet loom. The arrival time of the flying weft Y is detected by a detector 16 placed at a prescribed position in the weaving width. The arrival time of the tip end of the weft Y at the ejection action region of a stretch nozzle 10 placed at the side of weft insertion terminal is estimated by a control computer C based on the above detection result. At the same time, the computer C controls the ejection pressure wave form of the auxiliary nozzle 8 of the side of weft insertion terminal and the stretch nozzle 10, stops the ejection from the auxiliary nozzle 8 at the estimated time, starts the ejection of the stretch nozzle 10 and surely guides the tip end of the weft Y into a holding pipe 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jet room in which a weft is inserted by a jetting action of a main nozzle for weft insertion and an auxiliary nozzle for weft insertion, and a front end of the weft is held by a stretch nozzle installed at a weft insertion end. In the weft insertion control device.

[0002]

2. Description of the Related Art In a jet loom in which weft insertion is performed by the jetting action of a main weft insertion nozzle and a weft insertion auxiliary nozzle, it is important to properly control the flying state of the weft in order to improve the quality of the woven fabric. Therefore, JP-A-62-1250
The weft insertion adjusting device of Japanese Patent No. 49 detects the actual flying state of the weft inserted and adjusts the injection timing of the auxiliary nozzle for weft insertion.

It is also necessary in order to weave a good woven cloth to hold the tip of the weft thread after weft insertion to give a proper tension. Japanese Patent Laid-Open No. 61-207642 discloses a device for gripping the tip portion of the weft by the action of jetting pressure air. In this conventional device, the tip of the weft yarn is introduced into the gripping pipe by the jetting action of the tension nozzle, and the jet pressure of the tension nozzle applies tension to the weft yarn.

[0004]

In order to apply an appropriate tension by applying the jet pressure of the tension nozzle to the tip portion of the weft thread, the weft thread tip must be introduced into the gripping pipe without causing the weft thread slack. For that purpose, it is necessary to properly set the injection timing of the auxiliary nozzle for weft insertion on the terminal side of the weft insertion adjacent to the tension nozzle and the injection timing of the tension nozzle. The timing at which the tip of the weft inserted into the weft reaches the jet action region of the tension nozzle is different for each weft insertion. Therefore, when the jetting timing of the weft inserting auxiliary nozzle on the weft inserting end side is fixed, this jetting period is set broadly in consideration of variations in the timing when the weft tip reaches the jetting action area of the tension nozzle. . If such an injection timing is set, the weft yarn tip reaching the jet action region of the tension nozzle may continue to receive the jet action of the auxiliary weft insertion nozzle on the weft insertion end side. When such a jetting action of the weft-inserting auxiliary nozzle is performed, the tip of the weft thread to be introduced into the gripping pipe may flutter and the tip of the weft thread may not enter the gripping pipe.

In the conventional device disclosed in Japanese Patent Laid-Open No. 61-207642, the jetting state or jet pressure of not only the auxiliary nozzle for weft insertion but also the tension nozzle is detected by detecting the flying state of the weft. However, no reference is made to injection timing control or injection pressure control for smoothly introducing the weft yarn tip into the gripping pipe.

An object of the present invention is to provide a weft insertion control device in a jet loom which can surely introduce the tip of the weft into the gripping pipe by the jetting action of the stretch nozzle.

[0007]

Therefore, according to the present invention,
A jet loom is created in which the weft is inserted by the jetting action of the weft inserting main nozzle and the weft inserting auxiliary nozzle, and the weft tip is introduced into the holding pipe and held by the jetting action of the stretch nozzle installed at the end of the weft inserting. Target,
According to the first aspect of the invention, a weft tip arrival timing detecting means for detecting a tip arrival timing of the weft during the weft insertion flight, and a detection position after this position based on the weft tip arrival timing detected by the weft tip arrival timing detection means. Weft end arrival time prediction means for predicting the weft end arrival time at the weft arrival position of
A weft insertion control device is constituted by a weft insertion auxiliary nozzle on the weft insertion end side and a pressure waveform control means for controlling the jet pressure waveform of the stretch nozzle based on the weft tip arrival timing predicted by the weft tip arrival timing prediction means. However, at the time when it is predicted that the weft tip reaches the jet action area of the stretch nozzle, it is predicted that the injection of the auxiliary weft insertion nozzle on the weft insertion end side will be stopped and the weft tip will reach the jet action area of the stretch nozzle. Stretch nozzle is sprayed before the time.

According to the second aspect of the invention, the weft end arrival timing detecting means for detecting the end arrival time of the weft during weft insertion and the weft end arrival timing detected by the weft end arrival timing detection means are used. Weft tip arrival timing predicting means for predicting the weft tip arrival timing at the weft tip reaching position after the detection position, and weft insertion auxiliary on the weft inserting end side based on the weft tip arrival timing predicted by the weft tip arrival timing predicting means A weft-insertion control device is configured by a pressure waveform control unit that controls the injection pressure waveform of the nozzle, and the weft-insertion auxiliary nozzle on the weft-insertion end side at the time when the weft tip is expected to reach the injection action region of the stretch nozzle. Stretching at a predetermined time before the preset time range in anticipation that the end of the weft will reach the injection area of the stretch nozzle. Cheat was to inject.

[0009]

The weft end arrival time predicting means predicts the weft end arrival time in the jetting action area of the stretch nozzle based on the arrival time detected by the weft end arrival time detecting means.

In the first aspect of the invention, the pressure waveform control means stops the injection of the auxiliary nozzle for weft insertion at the predicted arrival time of the weft thread, and ejects the stretch nozzle before the predicted arrival time of the weft thread. To start.

In the second aspect of the invention, the time range in which the tip of the weft yarn is expected to reach the jet action area of the stretch nozzle is set in advance, and the pressure waveform control means is set at a predetermined time before the time range. Spray the stretch nozzle.
Then, the pressure waveform control means stops the injection of the weft inserting auxiliary nozzle at the predicted arrival time of the weft yarn.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIG.
A description will be given based on FIGS. 2 and 4.

1 is a winding type weft measuring and storing device,
The winding of the weft on the winding surface 1a of the weft measuring and storing device 1 and the pulling and unwinding of the weft from the winding surface 1a are controlled by the retracting operation of the locking pin 2a of the electromagnetic solenoid 2. Excitation / demagnetization of the electromagnetic solenoid 2 is performed by command control of the control computer C, and the control computer C determines the electromagnetic solenoid 2 based on the weft unwinding detection information from the weft unwinding detector 3.
Control the demagnetization of.

The weft yarn Y drawn out from the yarn winding surface 1a and ejected by the jetting action of the weft-insertion main nozzle 4 is transferred to the relay jets of the plurality of weft-insertion auxiliary nozzle groups 5, 6, 7, and 8. When the weft insertion is performed properly, the weft Y is detected by the weft detector 9 within a predetermined machine base rotation angle range. A weft presence detection signal from the weft detector 9 is input to the control computer C. The control computer C selects either continuous operation or stop of the loom based on the weft presence / absence detection signal.

A stretch nozzle 10 and a grip pipe 11 are installed opposite to each other at the weft inserting end. The facing gap between the stretch nozzle 10 and the grip pipe 11 intersects the weft insertion path of the weft Y.

The weft-insertion pressure air jet in the weft-insertion main nozzle 4 is controlled by opening and closing the electromagnetic valve V ₁ . The weft-insertion pressure air injection in the weft-insertion auxiliary nozzle groups 5 to 8 is controlled by opening and closing the electromagnetic valves V _2, V _3, V _{4, and} V ₅ . The weft holding pressure air jet in the stretch nozzle 10 is controlled by opening and closing the electromagnetic valve V ₆ .
The electromagnetic valve V ₁ is connected to the pressure air supply tank 12, and the electromagnetic valves V _{2 to} V ₅ are connected to the pressure air supply tank 13.
It is connected to the. The electromagnetic valve V ₆ is connected to the pressure air supply tank 14.

The opening / closing control of each of the electromagnetic valves V _{1 to} V ₆ is performed by a command from the control computer C. The control computer C commands opening / closing of the electromagnetic valves V _{1 to} V ₆ based on the machine base rotation angle detection signal from the rotary encoder 15.

A weft yarn end arrival detector 16 is installed in the weaving width region. The weft yarn tip arrival detector 16 detects the arrival of the weft yarn flying on the weft insertion path. A weft end arrival detection signal from the weft end arrival detector 16 is input to the control computer C. The control computer C controls the degaussing timing and the excitation timing of the electromagnetic valve V ₆ of the solenoid valve V ₅ based on the input of the weft tip reaches the detection signal from the weft tip reaches the detector 16.

The control computer C controls the injection timing of the weft-insertion auxiliary nozzle group 8 and the stretch nozzle 10 based on the injection timing control program shown in FIG. The injection timing control will be described below.

2 (a) and 2 (b) are graphs showing jetting pressure waveforms of the main weft inserting nozzle 4, the weft inserting auxiliary nozzle groups 5 to 8 and the stretch nozzle 10. FIG. The horizontal axis represents the time T, and the vertical axis represents the leading end position (weft insertion position) of the weft inserted. The horizontal axis shows a part of the angular range of one rotation of the machine base (range of crank angle 360 °) replaced by the time display, and each time symbol on the horizontal axis shows the time within a part of the crank angle range. Replaced with the display.

The curve M is the injection pressure of the main nozzle 4 for weft insertion.
Represents the force waveform, and the curve S₁, S₂, S ₃Is a weft insertion auxiliary
The injection pressure waveform of the slur group 5-7 is shown. These injection pressure waves
Shape M, S₁, S₂, S₃Is unchanged, that is, the electromagnetic valve V₁~
V_FourThe injection timing of is fixed. That is, the control
Nputa C is a main nose for weft insertion of any n pick.
The injection pressure of the auxiliary nozzle group 5 to 7
Waveforms M and S₁~ S₃To control.

The timing T _{0 in} FIGS. 2A and 2B is the time when the winding yarn on the winding surface 1a is released from the locking action of the locking pin 2a, that is, the excitation start timing of the electromagnetic solenoid 2 is started. Represents The weft Y released from the locking action of the locking pin 2a is jetted by the jetting action of the weft inserting main nozzle 4 represented by the jetting pressure waveform M. The injected weft Y is inserted by the injection action of the auxiliary insert nozzles 5 to 7 represented by the injection pressure waveforms S _{1 to} S ₃ .

When the tip of the n-th pick weft Y reaches the detection area of the weft tip arrival detector 16, the weft tip arrival detector 16 outputs a weft tip arrival detection signal to the control computer C. Control computer C to understand the weft tip reaches the timing Tx _n in response to the input of the weft tip reaches the detection signal, calculates the _{L 1 / (Tx n -T 0} ) = v n. As shown in FIG. 1, L ₁ represents the distance from the weft insertion main nozzle 4 to the detection detection area of the weft yarn end arrival detector 16. Therefore, v _n represents the flying speed of the weft Y of the nth pick.

The control computer C calculates the flying speed v
with _n to calculate the _{(Tx n + L 2 / v} n) = Tw n. As shown in FIG. 1, L ₂ represents the distance from the detection area of the weft yarn tip arrival detector 16 to the installation position of the gripping pipe 11, that is, the jet action area of the stretch nozzle 10. Therefore, the time Tw _n represents the time when the tip of the weft Y flying at the velocity v _n reaches the jet action region of the stretch nozzle 10. That is, the control computer C uses the weft yarn end arrival detector 1
The time when the tip of the weft Y reaches the jetting action region of the stretch nozzle 10 is predicted on the basis of the time Tx _n when the weft tip is detected by 6.

At time T = Te, the control computer C energizes the electromagnetic valve V ₅ . The timing Te is a constant value, and the auxiliary weft-insertion nozzle group 8 has a predetermined timing Te.
To start injection.

Time T = Tw_n-Δt₁When it comes to
Computer C is electromagnetic valve V₆To excite. Timing (Tw
_n-Δt₁) Is the time when it is calculated and determined for every nth pick
The stretch nozzle 10 will be used when the calculation is decided.
(Tw_n-Δt₁) To start injection. This jet flow is weft
It traverses this path and flows into the grip pipe 11. This jet
Shooting start time (Tw_n-Δt₁) Is the end of the weft Y
It is predicted that the injection action area of the nozzle 10 is reached.
Time Tw_nBefore. Also, the injection start timing (Tw _n-Δ
t₁) Indicates that the tip of the weft Y is the jet of the auxiliary nozzle group 8 for weft insertion.
Time Te predicted to reach the action area_nIn front of
It

Time T = Tw _n −Δt ₂ (Δt ₂ <Δ
At t ₁ ), the control computer C determines that the solenoid valve V ₅
Degauss. The timing (Tw _n -Δt ₂ ) is a timing calculated and determined for each n-th pick, and the weft-insertion auxiliary nozzle group 8 stops injection at this calculated and determined timing (Tw _n -Δt ₂ ). This injection stop timing (Tw _n −Δt ₂ ) is before the timing Tw _n at which it is predicted that the tip of the weft Y will reach the injection action area of the stretch nozzle 10. Further, the injection stop timing (Tw _n −Δt ₂ ) is the timing Te at which the tip of the weft Y is predicted to reach the injection action region of the auxiliary nozzle group 8 for weft insertion.
after _n .

That is, the stretch nozzle 10 starts jetting before the weft Y receives the jetting action of the weft-insertion auxiliary nozzle group 8 and the weft-laying after the weft Y begins to receive the jetting action of the weft-insertion auxiliary nozzle group 8. Of the auxiliary nozzle group 8 is stopped.
Then, the tip of the weft yarn Y that has not been subjected to the jetting action of the weft-insertion auxiliary nozzle group 8 reaches the jetting region of the stretch nozzle 10. The tip of the weft Y that has reached the jetting action area of the stretch nozzle 10 is blown into the gripping pipe 11 by the jetting action of the stretch nozzle 10.

A curve S _{4i in} FIG. 2A represents an injection pressure curve of the auxiliary nozzle group 8 for weft insertion of the i-th pick, and the curve E _i is i.
The ejection pressure waveform of the stretch nozzle 10 of the pick eye is shown. The curve S _{4j in} FIG. 2B represents the injection pressure curve of the auxiliary nozzle group 8 for weft insertion of the j-th pick, and the curve E _j represents the injection pressure waveform of the stretch nozzle 10 of the j-th pick. Figure 2
The straight line D _{i in} (a) shows the flying state of the weft yarn Y at the i-th pick, and the straight line D _{j in} FIG. 2 (b) shows the flying state of the weft yarn Y at the j-th pick. The flight speed of the weft yarn Y at the j-th pick is higher than that at the i-th pick. Conversely, the flying speed of the weft Y is i
It may be slower than the flying speed of the pick eye. Even if there is such variation in the flying speed of the weft Y, the stretch nozzle 10 starts jetting before the tip of the weft Y reaches the jetting operation region of the weft-insertion auxiliary nozzle group 8. And
Immediately after the tip of the weft Y begins to be jetted by the weft-insertion auxiliary nozzle group 8, the injection of the weft-insertion auxiliary nozzle group 8 is stopped.

If the tip of the weft yarn Y is still receiving the jetting action of the weft-inserting auxiliary nozzle 8, it will flap. However, in the present embodiment, even if the weft flying speed changes for each weft insertion, the tip of the weft Y is released from the jetting action of the weft-inserting auxiliary nozzle group 8 before reaching the jetting action region of the stretch nozzle 10. To be done. Therefore, the tip of the weft yarn Y reaches the jet action region of the stretch nozzle 10 without fluttering and is subjected to the jet action of the stretch nozzle 10. Since the tip of the weft Y is not fluttering, the tip of the weft Y is stretch nozzle 10
And is smoothly introduced into the grip pipe 11.

The time intervals Δt ₁ and Δt ₂ are constant values preset so that the tip of the weft Y can be smoothly introduced into the gripping pipe 11. The distance between the jet action region of the auxiliary nozzle group 8 for weft insertion and the jet action region of the stretch nozzle 10 is short. Therefore, even if the flying speed v _n of the weft Y varies, the time required for the tip of the weft Y to reach the ejection action area of the stretch nozzle 10 from the ejection action area of the auxiliary nozzle group 8 for weft insertion is small. . Therefore, the time Te _n receiving the injection action of the weft insertion auxiliary nozzle 8, the time interval Delta] t _1, the injection start timing of the stretch nozzle 10 also Delta] t ₂ is a constant value (Tw _n -Δt ₁₎ and the auxiliary nozzle weft insertion It falls within the injection end timing (Tw _n −Δt ₂ ) of the group 8. However, it is also possible to determine the time intervals Δt ₁ and Δt ₂ in accordance with the predicted change in the weft yarn tip arrival time Tw _n .

In this embodiment, the injection start timing of the stretch nozzle 10 is changed according to the flight speed of the weft. The higher the weft flying speed, the earlier the injection start timing, and the slower the weft flying speed, the later the injection start timing. Therefore, unnecessary air injection from the stretch nozzle 10 is eliminated,
Air consumption can be reduced.

The injection stop timing of the auxiliary nozzle group 8 for weft insertion is not limited to the example shown in FIG. The injection of the auxiliary nozzle for weft insertion on the weft insertion end side may be stopped at the time when the weft yarn tip is predicted to reach the jet action region of the stretch nozzle. Further, the injection start timing of the stretch nozzle 10 is not limited to the example shown in FIG. It suffices that the stretch nozzle jets before the time when the tip of the weft reaches the jet action area of the stretch nozzle.

The present invention is of course not limited to the above-mentioned embodiment, but an embodiment of injection timing control shown in the graph of FIG. 3 and the flowchart of FIG. 5 is also possible. The curve F _{i in} FIG. 3 represents the injection pressure waveform of the stretch nozzle 10. Injection start timing Ts of the stretch nozzle 10
₁ and the injection end timing Ts ₂ are preset to constant values. Therefore, the stretch nozzle 10 starts the injection at the predetermined time Ts ₁ regardless of the flying speed of the weft Y, and the predetermined time Ts
Stop the injection at ₂ . Therefore, although the ejection period of the stretch nozzle 10 is longer than that in the above-described embodiment, the ejection timing control of the stretch nozzle 10 is easy.

Further, according to the present invention, the weft unwinding detector 3 in the above embodiment is used to detect the arrival time of the weft end at a predetermined position, and the weft end reaches the jet action area of the stretch nozzle based on the detection result. You can also predict when. By this prediction, the injection timing of the auxiliary nozzle group 8 for weft insertion, and further the injection timing of the stretch nozzle 10 can be controlled as in the above embodiment.

[0036]

As described above in detail, according to the present invention, the injection of the auxiliary weft-inserting nozzle on the weft inserting end side is stopped at the time when the weft end is expected to reach the jet action area of the stretch nozzle, Since the stretch nozzle is jetted before the time when the tip is expected to reach the jet action area of the stretch nozzle, even if the flight speed of the weft varies, the weft tip is surely introduced into the gripping pipe and the It has an excellent effect that tension can be applied to the weft.

[Brief description of drawings]

FIG. 1 is a combination diagram of a weft inserting device and an injection timing control circuit.

FIG. 2A is a graph showing the relationship between the weft flying state of the i-th pick and the jetting timing. (B) is a graph showing the relationship between the jetting timing and the weft flying state of the j-th pick.

FIG. 3 is a graph showing a relationship between a weft flying state and an injection timing of another example.

FIG. 4 is a flowchart showing an injection timing control program.

FIG. 5 is a flowchart showing an injection timing control program of another example.

[Explanation of symbols]

4 ... main nozzle for weft insertion, 5-7 ... auxiliary nozzle group for weft insertion, 8 ... auxiliary nozzle group for weft insertion on the weft insertion end side, 1
0 ... Stretch nozzle, 11 ... Grip pipe, 16 ... Weft yarn tip arrival detector, C ... Weft yarn tip arrival timing predicting means and pressure waveform control means, Y ... Weft yarn.

Claims (2)

[Claims] 1. A weft insertion main nozzle and a weft insertion auxiliary nozzle eject the wefts by the jetting action, and a stretch nozzle installed at the end of the weft insertion introduces the weft tip into the gripping pipe. In the jet loom to be gripped, the weft end arrival time detection means for detecting the end arrival time of the weft at a predetermined position within the weft width during weft insertion flight, and the weft end arrival time detected by the weft end arrival time detection means Based on this detection position, the weft tip arrival timing predicting means for predicting the weft tip arrival timing at the weft arrival position and the weft insertion end side weft insertion based on the weft tip arrival timing predicted by the weft tip arrival timing prediction means Auxiliary nozzle and a pressure waveform control means for controlling the injection pressure waveform of the stretch nozzle. At the time when it is predicted that the nozzle will reach the jet action area, the injection of the auxiliary nozzle for weft insertion on the weft insertion end side is stopped, and before the time when the weft tip is expected to reach the jet action area of the stretch nozzle, the stretch nozzle Weft insertion control device for jet loom. 2. The weft inserting main nozzle and the weft inserting auxiliary nozzle eject the weft into the weft, and the stretch nozzle installed at the end of the weft inserts the weft tip into the gripping pipe. In the jet loom to be gripped, the weft end arrival time detection means for detecting the end arrival time of the weft at a predetermined position within the weft width during weft insertion flight, and the weft end arrival time detected by the weft end arrival time detection means Based on this detection position, the weft tip arrival timing predicting means for predicting the weft tip arrival timing at the weft arrival position and the weft insertion end side weft insertion based on the weft tip arrival timing predicted by the weft tip arrival timing prediction means Waveform control means for controlling the jet pressure waveform of the auxiliary nozzle for sewing, the tip of the weft reaches the jet action area of the stretch nozzle. Then, at the predicted timing, the injection of the auxiliary nozzle for weft insertion on the weft insertion end side is stopped, and it is expected that the weft tip will reach the injection action area of the stretch nozzle, and a predetermined time before the preset time range. A weft insertion control device in a jet loom that ejects stretch nozzles to the inside.