JP2916013B2 - Weft insertion control method and device in air jet loom - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a weft in an air jet loom for rationally adjusting each conveying force between a main nozzle and an auxiliary main nozzle when weft is inserted through a so-called double nozzle. The present invention relates to an insertion control method and its device.

[0002]

2. Description of the Related Art In an air jet loom, an auxiliary main nozzle may be provided behind a main nozzle to form a so-called double nozzle in order to realize a stronger conveying force for a weft.

When using a double nozzle, it is indispensable to appropriately set the conveying force of both the main nozzle and the auxiliary main nozzle. In addition to the requirement that the absolute values of the two conveying forces are not only large enough, but if they are not properly balanced, the weft yarns will randomly fly at the exit side of the main nozzle. Vibration or meandering between the main nozzle and the auxiliary main nozzle occurs.In either case, the flight speed of the weft is not stable, and there is a risk of inducing weft insertion defects such as chip trouble and vent topics. Because there is.

Therefore, conventionally, the behavior of the weft yarn during the test weaving has been observed, and the conveying force of each nozzle has been adjusted so that the weft yarn stably flies in a predetermined direction without causing harmful meandering or the like. A balance is being made. In general, the adjustment of the conveying force of the main nozzle and the auxiliary main nozzle may be performed by changing the air pressure supplied to the nozzle. However, some nozzles having a built-in variable throttle mechanism are also in practical use (for example, EPC). Japanese Patent No. 0239137).

[0005]

According to the conventional technique, it takes a very long time to properly balance the transporting power of the main nozzle and the auxiliary main nozzle, and the work requires skill. Was inevitable. That is, since the behavior of the weft during the trial weaving had to be visually observed, for example, by a strobe device, the observation operation itself was a complicated operation requiring skill, and the transport force was adjusted based on the observation result. This is because they had to rely on the experience and intuition of the workers. In such manual adjustment, it was impossible at all to adjust the conveying force during weaving at any time during weaving in order to cope with fluctuations in the flight characteristics of the weft, and to maintain the balance appropriately. .

Accordingly, an object of the present invention is to provide a method for adjusting the transfer force improperly in view of the problems of the prior art.
The flight of the weft becomes unstable and the weft arrival angle and the weft insertion control angle (the weft insertion start angle and the weft unwinding angle at which the weft equivalent to one pick is unwound from the weft length storage device) Focusing on the fact that large variations occur in the air jet loom, which can automatically adjust the carrying force of the main nozzle and the auxiliary main nozzle properly while balancing the work, An object of the present invention is to provide an input control method and an apparatus therefor.

[0007]

Means for Solving the Problems In order to achieve the above object, a first invention according to the present application has a structure in which a weft is inserted through a double nozzle cascading a main nozzle and an auxiliary main nozzle. The gist of the present invention is to detect the arrival angle of the weft yarn and adjust the conveying force between the main nozzle and the auxiliary main nozzle while maintaining a predetermined relationship based on the deviation from the target arrival angle.

According to a second aspect of the present invention, there is provided a detecting means for detecting an arrival angle of a weft yarn based on a feeler signal, a comparing means for comparing a reaching angle from the detecting means with a target reaching angle, and calculating a deviation. Computing means for calculating an operation amount for adjusting the conveying force between the main nozzle and the auxiliary main nozzle based on the deviation of the main nozzle while maintaining the predetermined relationship, and individually outputting the operation amount to the main nozzle and the auxiliary main nozzle. That is the gist.

In both the first invention and the second invention, a weft insertion control angle may be used as a control amount instead of the weft arrival angle. However, the weft insertion control angle in this case is controlled by another control system so as to maintain the weft arrival angle in a predetermined range, for example.

[0010]

According to the first aspect of the invention, the respective conveying forces of the main nozzle and the auxiliary main nozzle are adjusted based on the deviation of the weft arrival angle or the deviation of the weft insertion control angle. At this time, since the adjustment is performed while maintaining the predetermined relationship, the balance between the two is not lost. Here, the predetermined relationship means that, for example, by trial weaving, one transport force S1i (i = 1, 2,...) And the other balanced transport force S2i (i = 1, 2,. From these sets of conveying forces (S1i, S2i), the other conveying force S2 for one arbitrary conveying force S1 is calculated.
May be determined by interpolation or extrapolation. Further, a constant k = S20 / S10 is obtained from the arbitrarily set values S10 and S20 of the balanced conveying forces S1 and S2, and this constant k is fixedly applied, whereby one conveying force S
For 1, the other conveying force S2 may be determined as S2 = kS1.

According to the configuration of the second aspect, the detecting means detects the weft arrival angle or the weft insertion control angle, and the comparing means can detect the deviation between them. Further, the calculating means calculates an operation amount for adjusting the transport force between the main nozzle and the auxiliary main nozzle while maintaining the predetermined relationship, and outputs the operation amount individually to the main nozzle and the auxiliary main nozzle. At this time, the main nozzle and the auxiliary main nozzle do not lose their balance,
Each transport force can be adjusted.

[0012]

Embodiments will be described below with reference to the drawings.

The weft insertion control device 10 in the air jet loom includes a detecting means 11, a comparing means 12, and a calculating means 13 (FIG. 1).

The air jet loom has a main nozzle N1.
And a double nozzle having an auxiliary main nozzle N2 cascaded behind it. When the weft W is unwound from the yarn supplying body W1, the rotating arm D1, the drum D2, the locking pin D
3 is supplied to an auxiliary main nozzle N2 via a weft length measuring and storing device D of a drum type provided with a nozzle 3. Auxiliary main nozzle N
2. The weft W from the main nozzle N1 is inserted into the warp opening Wp and beaten by a reed (not shown) to form a woven fabric Wc.

The main nozzle N1 and the auxiliary main nozzle N2
From the air sources AC, AC, respectively, from the pressure regulator N1
Air pressure is supplied via a, N2a and on-off valves N1b, N2b. Therefore, the main nozzle N1 and the auxiliary main nozzle N2 supply the operation signals Sg1 and Sg2 to the pressure regulating valves N1a and N2a and adjust the air pressure to adjust the conveying forces S1 and S2 applied to the weft W. Can be. The on-off valves N1b and N2b and the locking pin D3 of the weft length measuring and storing device D
Operates in synchronization with the rotation angle (hereinafter referred to as the loom mechanical angle) θ of the main shaft of the loom (not shown), and can insert the weft W into the warp opening Wp at a predetermined weft insertion start angle θso.

The detecting means 11 receives a feeler signal Sf from a weft feeler WF. However, the weft feeler WF is disposed on the side opposite to the weft insertion side of the woven fabric Wc or in the course of the flight path of the weft W.
Can be detected. Also, detecting means 1
1, the output of the encoder EN for detecting the loom mechanical angle θ is also input.

The output of the detecting means 11 is connected to a comparing means 12, to which a target arrival angle θeo from a not-shown setting device is inputted. Further, the comparing means 12
Is connected to the calculating means 13, to which a constant k from another setting device (not shown) is input. The output of the calculating means 13 is individually connected to pressure regulators N1a and N2a via amplifiers 14a and 14b.

Since the weft feeler WF detects the inserted weft W and outputs a feeler signal Sf, the detecting means 11 detects the loom mechanical angle θ from the encoder EN at the time when the feeler signal Sf is output. , The loom mechanical angle θ when the weft W reaches the position of the weft feeler WF, that is, the arrival angle θe of the weft W, can be detected and output to the comparison means 12. Therefore, the comparison means 12 compares the arrival angle θe with the target arrival angle θeo, and outputs the deviation Δθe = θe−θeo to the calculation means 13.

The calculating means 13 calculates the conveying forces S1 and S2 of the main nozzle N1 and the auxiliary main nozzle N2 using the constant k based on the deviation Δθe. The calculation means 13
Subsequently, the air pressure P1 required for the main nozzle N1 and the auxiliary main nozzle N2 in order to realize the conveying forces S1 and S2,
P2 is calculated, and an operation signal S corresponding to the air pressures P1, P2 is calculated.
Since g1 and Sg2 are individually output to the pressure regulators N1a and N2a, the main nozzle N1 and the auxiliary main nozzle N2 can weft the weft yarn W by the predetermined conveying forces S1 and S2. Here, the air pressures P1 and P2 are operation amounts output by the calculating means 13 to the pressure regulators N1a and N2a in order to realize the conveying forces S1 and S2.

The constant k can be determined and set as follows. That is, in the trial weaving stage, the initial setting values S10, S10 of the carrying forces S1, S2 of the balanced main nozzle N1 and auxiliary main nozzle N2 are manually adjusted.
Find 20. Next, a constant k = S20 / S10 is obtained, this constant k is set in the setting unit, and thereafter, it may be fixed and used. That is, the main nozzle N1 is determined based on the deviation Δθe.
Is calculated, the transfer force S2 of the auxiliary main nozzle N2 can be obtained by S2 = kS1. Alternatively, the conveying force S2 may be obtained in advance based on the deviation Δθe, and the conveying force S1 may be obtained from S1 = S2 / k.

[0021]

[Other Embodiments] When a set of a plurality of balanced conveyance forces S1i, S2i (i = 1, 2,...) Is found for the main nozzle N1 and the auxiliary main nozzle N2 in the test cloth. , Constant k can be expressed as a function of the conveying forces S1, S2 (FIG. 2). Now, if a balanced set of the conveying forces S1i and S2i is displayed by points Xi (S1i and S2i), a curve X connecting the points Xi smoothly can be obtained. The transport force S1, S2 of the main nozzle N1 and the auxiliary main nozzle N2
Is calculated, the other can be determined by interpolation or extrapolation using the curve X. Therefore, the air pressures P1, P2 for realizing the conveying forces S1, S2 may be calculated and output as operation symbols Sg1, Sg2.

Xi (S1i, S2i) in the previous embodiment is:
It can also correspond to the point Yi (P1i, P2i) (FIG. 3). Here, the points Yi (P1i, P2i) are the air pressures P1i, P2i corresponding to the balanced conveying forces S1i, S2i.
Shall be shown. Therefore, the calculating means 13 calculates the deviation Δθ
Based on e, the air pressure P1 corresponding to the conveying force S1 is calculated, and subsequently, the air pressure P2 can be determined with reference to the curve Y formed by the points Yi (P1i, P2i). At this time, it goes without saying that the transport force S2 and the corresponding air pressure P2 may be calculated first, and then the air pressure P1 may be determined.

When the locking pin D3 of the weft length measuring and storing device D is controlled by another weft insertion control system CK, for example, so that the arrival angle θe of the weft W is within a predetermined range (FIG. 4). Detecting means 11 in each of the above-described embodiments.
Can input a weft insertion start signal Sck from the weft insertion control system CK. However, the weft insertion start signal Sck is to start the weft insertion operation by driving the locking pin D3 to the unwinding position to unwind the weft yarn W from the drum D3.

The detection means 11 can read the loom mechanical angle θ at the time of input of the weft insertion start signal Sck and detect the weft insertion start angle θs.
2, the deviation Δθs = θs−θso can be calculated by comparing the weft insertion start angle θs with the target weft insertion start angle θso. Therefore, the calculation means 13 maintains the predetermined relationship in exactly the same manner as in each of the above-described embodiments,
It is possible to calculate the conveying forces S1 and S2 in which the main nozzle N1 and the auxiliary main nozzle N2 are balanced, and calculate and output the corresponding air pressures P1 and P2.

The detecting means 11 calculates the weft insertion start angle θ.
Instead of s, the weft unwinding angle θk may be detected (FIG. 5). A weft sensor WK is disposed near the front of the weft length measuring and storing device D. The weft sensor WK detects the weft W unwound from the drum D2 and outputs a pulsed weft signal Sk every turn. Counter 1
6 counts the weft signal Sk to obtain the drum D2.
Can output a weft unwinding signal Sk1 indicating that the weft W corresponding to one pick has been unwound.
No. 1 can detect the weft unwinding angle θk. Therefore, comparison means 12, the weft solution舒角degree θk as compared to the target weft solution舒角degree Shitako, deviation Δθk = θ k - the theta ko may calculate output.

That is, the weft insertion start angle θs and the weft unwinding angle θk can be treated equally as the weft insertion control angle. Also, the weft insertion start signal Sck, the weft unwinding
The signal Sk1 can be treated equally as a weft insertion control signal.
Wear.

In the above description, the main nozzles N 1,
The conveying forces S1 and S2 of the auxiliary main nozzle N2 are generally
The pressure can be adjusted by adjusting the air pressures P1 and P2 via the pressure regulators N1a and N2a. However, when the main nozzle N1 and the auxiliary main nozzle N2 have a built-in variable throttle mechanism, the operation signals Sg1 and Sg2 are used. Needless to say, the variable aperture mechanism may be adjusted. At this time, the amount of operation from the calculating means 13 is the amount of aperture of the variable aperture mechanism.

The conveying forces S1, S2 are determined by the on-off valve N1b,
In some cases, the adjustment can be made substantially by changing the opening time of N2b and changing the period in which the main nozzle N1 and the auxiliary main nozzle N2 are in the open state. In this case, the operation amount from the calculating means 13 may be output as an opening operation signal for the on-off valves N1b and N2b.

[0029]

As described above, according to the first aspect of the present invention, when weft insertion is performed through the double nozzle, the weft insertion angle or the deviation of the weft insertion control angle is determined based on the deviation of the weft insertion angle. By adjusting the conveying force with the auxiliary main nozzle while maintaining a predetermined relationship, the automatic transfer of the conveying force can be performed without disturbing the balance of the conveying force between the two due to fluctuations in the flight characteristics of the weft during weaving. Since the adjustment is possible, there is an excellent effect that the weft insertion operation can be further stabilized.

According to the second aspect, by combining the detecting means, the comparing means, and the calculating means, the detecting means detects the arrival angle of the weft or the weft insertion control angle, and the calculating means determines, based on the deviation, Since it is possible to output an operation amount for adjusting the conveyance force between the main nozzle and the auxiliary main nozzle while maintaining a predetermined relationship, there is an effect that the first invention can be carried out smoothly.

[Brief description of the drawings]

FIG. 1 is a block diagram of the overall configuration

FIG. 2 is an operation explanatory diagram showing another embodiment.

FIG. 3 is a diagram corresponding to FIG. 2, showing another embodiment.

FIG. 4 is a block diagram of a main part showing still another embodiment.

FIG. 5 is a main part block diagram showing another embodiment.

[Explanation of symbols]

 W: weft N1 ... main nozzle N2 ... auxiliary main nozzle θe ... arrival angle θeo ... target arrival angle θs ... weft insertion start angle θso ... target weft insertion start angle θk ... weft unwinding angle θko ... target weft unwinding angle Δθe, Δθs .DELTA..theta.k... Deviation S1, S2... Conveying force Sf... Feeler signal Sck.

Claims (4)

(57) [Claims] When a weft is inserted through a double nozzle cascading a main nozzle and an auxiliary main nozzle, an arrival angle of the weft is detected, and the main nozzle and the auxiliary main nozzle are detected based on a deviation from a target arrival angle. A weft insertion control method in an air jet loom, wherein a transfer force with a nozzle is adjusted while maintaining a predetermined relationship. 2. When weft wefting is performed through a double nozzle cascading a main nozzle and an auxiliary main nozzle, a weft insertion control angle is detected, and based on a deviation from a target weft insertion control angle, the main nozzle is connected to the main nozzle. A weft insertion control method in an air jet loom, wherein a transfer force with an auxiliary main nozzle is adjusted while maintaining a predetermined relationship. 3. A detecting means for detecting an arrival angle of a weft yarn based on a feeler signal, a comparing means for comparing an arrival angle from the detecting means with a target arrival angle to calculate a deviation, and a deviation from the comparing means. An operation means for calculating an operation amount for adjusting the conveying force between the main nozzle and the auxiliary main nozzle while maintaining the predetermined relationship, and outputting the operation amount to the main nozzle and the auxiliary main nozzle individually. Weft insertion control device in the jet loom. 4. A detecting means for detecting a weft insertion control angle based on a weft insertion control signal, a comparing means for calculating a deviation by comparing the weft insertion control angle from the detecting means with a target weft insertion control angle, Calculation means for calculating an operation amount for adjusting the conveyance force between the main nozzle and the auxiliary main nozzle while maintaining a predetermined relationship based on the deviation from the comparison means, and outputting the operation amounts individually to the main nozzle and the auxiliary main nozzle. A weft insertion control device for an air jet loom comprising: