JP2001234450A - Method and apparatus for weft inserting of fluid jet type loom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a loom furnished with a weft inserting method for driving a weft inserting member corresponding to a weft releasing condition from a yarn feeder by a simplified constitution without calculating a wound diameter of the yarn feeder. SOLUTION: In this fluid jet type loom for operating a weft inserting member according to a set weft inserting condition and inserting a weft, a release sensor for detecting a weft released from the yarn feeder is arranged corresponding to the yarn feeder, the weft inserting condition is preset according to the occurrence frequency of a weft release signal from the yarn feeder, the occurrence frequency of the release signal is obtained. During the operation of the loom, the weft inserting member is driven according to the weft inserting condition corresponding to the obtained occurrence frequency.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weft insertion method and apparatus for a fluid jet loom which drives a weft insertion member in response to a weft unwinding state from a yarn supplying body.

[0002]

2. Description of the Related Art It is known that, in a fluid jet loom, particularly an air jet loom, a weft conveying speed changes depending on a position of a diameter of a weft supplying body used. In order to keep the weft insertion flight speed constant, there is known a technique in which the supply pressure to the weft insertion nozzle is changed stepwise in response to exhaustion of the yarn supply body or change of yarn supply (for example, Japanese Utility Model Publication No. 63-63).
-19341 and JP-A-3-119143. ).
In addition, the operation timing (timing) of the weft insertion member such as the weft insertion nozzle or the weft unwinding timing from the weft length measuring device is changed according to a predetermined pattern corresponding to the change of the yarn supply or the exhaustion of the yarn supply. Is known (for example, Japanese Unexamined Patent Application Publication No.
-82849. ).

[0003]

In order to change the weft insertion conditions in response to the exhaustion of the yarn feeder, it is necessary to know an accurate winding diameter of the yarn feeder. For example, it is possible to change the weft insertion condition in anticipation of the amount of decrease in the diameter of the yarn supplying body based on the operation time. There is a problem that a deviation from the actual remaining amount of the winding occurs, and the weft insertion becomes unstable. As a method of accurately knowing the winding diameter of the yarn supplying body, it is conceivable to provide a winding diameter sensor for measuring the diameter of the yarn supplying body as opposed to the yarn supplying body as disclosed in JP-A-3-82849.
In general, this type of sensor is expensive and has problems such as a change in detection characteristics over time, which is not practical.

In view of such a problem, the present invention drives the weft insertion member in accordance with the weft unwinding state from the yarn supplying body without calculating the winding diameter of the yarn supplying body with a simplified configuration. An object of the present invention is to provide a loom equipped with a weft insertion method.

[0005]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a fluid jet loom for operating a weft insertion member in accordance with set weft insertion conditions to detect an unwound weft from a yarn supplying body. A sensor is arranged corresponding to the yarn supplying body, and the set weft insertion condition is preset according to the frequency of occurrence of the weft unwinding signal from the unwinding sensor, and the frequency of occurrence of the unwinding signal is obtained. In a first aspect, driving the weft insertion member in accordance with the weft insertion condition corresponding to the calculated occurrence frequency is a first gist.

The frequency of occurrence of the unwinding signal is, for example, the time from the generation of the unwinding signal to the generation of the next unwinding signal, that is, the generation interval of the unwinding signal, or the generation of the unwinding signal per unit time. It can be a count. Preferably, the influence of the variation is obtained by obtaining from the time when the unwinding signal occurs two or more times, or from the number of occurrences of the unwinding signal per unit time determined so that a plurality of unwinding signals can be obtained. It is possible to obtain the frequency of occurrence of the unwinding signal in which is suppressed. Preferably, the occurrence frequency of the unwinding signal may be obtained in accordance with a weft winding command in a weft measuring device interposed between the yarn supplying body and the weft insertion member.

The weft insertion conditions set in correspondence with the frequency of occurrence of the above-mentioned unwinding signal include, for example, in a fluid jet loom, the weft insertion flight start timing, the injection period of the weft insertion nozzle, and the injection pressure of the weft insertion nozzle. At least one of which is conceivable.

Further, as an apparatus for specifically realizing the invention of the first aspect, an unwinding sensor provided corresponding to the yarn supplying body and detecting an unwound yarn from the yarn supplying body, A signal is inputted, a weft insertion condition output means for obtaining the frequency of occurrence of the unwinding signal and outputting a predetermined weft insertion condition corresponding thereto, and driving the weft insertion member according to the output weft insertion condition. It is a second gist of the present invention to provide a driving means for performing the above.

According to the present invention, the weft insertion condition is set in advance in accordance with the frequency of occurrence of the unwind signal, and the weft insertion member is driven during the weaving operation in accordance with the weft insertion condition corresponding to the frequency of occurrence of the unwind signal. Weft insertion can be performed in response to changes in the state of weft unwinding from the yarn feeder without detecting the winding diameter of the yarn feeder with a simplified system configuration compared to conventional systems. And weft insertion can be made more stable.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a weft insertion device of an air jet loom which is a fluid jet loom. The loom 10
A yarn supplying body 12a for supplying the weft 11, a weft measuring device 13,
It has a locking pin 14 attached thereto, and further includes a weft 1
And a plurality of sub-nozzles 16 arranged in a warp opening in the middle of the weft flight path and energizing the flying weft 11 by air injection.
And In the case of the air jet loom in FIG. 1, the weft insertion member referred to in the present case includes the locking pin 14, the main nozzle 15 and the sub-nozzle 16 which constitute the weft insertion nozzle.

The main nozzle 15 is connected to a pressure regulating device 24 composed of, for example, an electropneumatic proportional valve via an electromagnetic on-off valve 22 and an air tank (not shown). Each sub-nozzle 16 in the weft flight path is divided into groups in the weft insertion direction. Connected respectively. Each pressure regulator 2
4. . 24 is connected to a common fluid supply 25. The main shaft 17 of the loom 10 is connected to various devices such as a warp shedding device (not shown), a reed 19 and a yarn feeding cutter 18.

The yarn end of the yarn feeder is held by the tensioner 40 in a state where the yarn end is tied in advance so that even if the yarn feeder 12a is exhausted, the yarn end is continuously drawn out from the next yarn feeder 12b. . And the weft 11 pulled out from the yarn supplying body 12a is
It is guided to the weft length measuring device 13 via the guide 44. The yarn supplying body 12a and the yarn supplying body 12b are provided with an unwinding sensor 42 and an unwinding sensor 43 for detecting the unwound yarn from the yarn supplying body, respectively.

More specifically, a light projector 42 that projects light from the center of the yarn supplying body 12a in the radial direction is provided in front of the bobbin.
and a light-receiving sensor 42b which receives the light and is spaced apart in the radial direction, and an unwinding sensor 42 for forming an optical axis is arranged. Upon interruption, the light receiver 42b detects this and outputs an unwinding signal (pulse signal). In addition, a light projector 43a and a light receiver 43b are similarly arranged in front of the bobbin of the yarn supplying body 12b.
And an unwinding sensor 43 forming an optical axis between them. In this way, the unwinding sensors are respectively arranged corresponding to the yarn feeders, so that even when the yarn feeders are switched, the unwound weft can be continuously detected. In addition,
The unwinding sensor may be a reflection type optical sensor or any other detection method, and may be any as long as it can reliably detect the unwound weft. In addition, the optical axis is formed not only in the radial direction, but also in the radial direction.
It may be formed in the diameter direction, or a plurality of optical axes may be configured.

The weft length measuring device 13 rotates the yarn guide to wind and store the weft 11 on the drum peripheral surface, and the wound weft is engaged with the locking pin 14 in the advanced state.
It is locked by. At the time of opening the warp of the loom, the locking pin 14 is retracted by the later-described weft insertion drive means 30 so that the wound weft can be unwound, while the weft of the main nozzle 15 and the sub-nozzles 16. The fluid is relay-injected from the inlet nozzle to be weft-inserted.
When the weft 11 is unwound by a predetermined number of turns, the locking pin 14 is in an advanced state, the weft 11 is locked thereon, and the weft insertion is completed as shown in the figure. Eventually, the inserted weft yarn 11 is beaten by a reed 19 and cut by a yarn feeding cutter 18. In this way, the weft yarns 11 are sequentially woven.

In a multicolor weft weaving machine that selects and wefts a weft according to a weft insertion pattern set in advance for each revolution of the loom, length measuring members such as a weft length measuring device 13 to a locking pin 14, and The main nozzle 15, the electromagnetic on-off valve 22 for controlling the injection, and the pressure regulating device 24 are originally provided for each weft, but are not shown for convenience.

The weft insertion drive means 30 includes a main controller 32,
Timing controller 36 and pressure controller 3
The main controller 32 is further connected to a weft insertion condition output means 50. FIG. 2 shows the internal configuration of the weft insertion condition output means 50 constituting a main part of the present invention.
It has a detector 52, a function setting unit 54, a correction signal generator 56, and a calculator 58.

The weft insertion condition setting unit 34 includes control data for the weft length measuring device 13 and the weft insertion nozzle, which are the weft insertion conditions, for example, the locking pin 14 set in accordance with the loom crank angle signal θ. The retreat (unwinding) and advancing (locking) timings, the injection start / injection timings of the weft insertion nozzles such as the main nozzle 15 and the sub nozzle 16 and the injection pressure for each weft insertion nozzle are set in advance. Arithmetic unit 58 with weft insertion conditions as signal Ss1
Send to

On the other hand, unwinding signals Sa and Sb from respective unwinding sensors provided corresponding to the yarn supplying body are input to the detector 52, and the detector 52 receives the input of each unwinding signal. , The frequency of the unwinding signal from the yarn supplying device during the weft withdrawal is determined, and the detection result is output to the correction signal generator 56 as the signal St.

As a method for the detector 52 to determine the frequency of occurrence of the unwind signal, a method shown in FIG. 3 can be considered. First, as a first method, a time measuring device is provided in the detector 52, and the time from when the unwinding signal is generated until the next unwinding signal is input, that is, the generation interval of the unwinding signal is determined as the frequency of occurrence. May be output as a signal corresponding to. In consideration of the variation in the unwinding signal, as a second method, the time until the unwinding signal is generated a predetermined number of times is measured, and the measured time is converted into the time per one cycle, and the unwinding signal is calculated. The signal generation interval can be obtained. Further, focusing on the number of occurrences of the unwinding signal per unit time, as a third method, the inside of the apparatus may be configured to count the number of occurrences of the unwinding signal per unit time, and this may be output. it can.

Since the weft unwinding from the yarn supplying body occurs during the winding of the weft by the weft measuring device 13, the frequency of occurrence of the unwinding signal is determined in consideration of this. A winding command signal Wd1 is output from a winding amount control mechanism (not shown) for the weft measuring device 13, and is input to the detector 52 as shown by a dotted line in FIG. This signal is a signal for instructing the weft length measuring device 13 to wind the winding to compensate for the shortage of the winding amount due to the weft insertion.
By rotating a yarn guide (not shown), the weft 11 is wound around the drum peripheral surface. On the other hand, the detector 52 recognizes that the weft unwinding from the yarn feeder is generated by the input of this signal, and operates the above-described internal device to generate the weft unwinding signal from the selected yarn feeder. Can be requested.
In the multicolor weft insertion loom, a weft selection command signal CL1... For instructing the selected weft is input to the main control device 32, and the main control device 32 controls the locking pin or the weft insertion corresponding to the selected weft signal. The selected weft can be inserted by driving a weft insertion member such as a nozzle.

In the function setting unit 54, a correction amount to be output corresponding to the frequency of occurrence of the unwinding signal is set in advance, and the correction amount is set in the form of a function corresponding to the value of the occurrence frequency. Send to Therefore, the correction signal generator 56 obtains a correction amount corresponding to the frequency of occurrence of the unwind signal input from the detector 52 using the setting function, and outputs this to the arithmetic unit 58 as a signal Ss2. While the control data for the weft insertion member, which is the signal Ss1 from the weft insertion condition setting unit 34, is input to the arithmetic unit 58, the correction amount signal Ss2 from the correction signal generator 56 is input thereto. Signals the weft insertion conditions corrected according to the frequency of occurrence of the unwind signal
It is output to the main controller 32 as Sg.

The main controller 32 sends an operation command for the weft insertion member to the timing controller 36 and the pressure controller 38 according to the weft insertion conditions input from the calculator 58. More specifically, the main control device 32 sends an operation start command and an operation end command to each weft insertion member to the timing controller 36 in accordance with the crank angle signal θ from the encoder 20 according to the corrected setting timings, The corrected pressure command value is sent to the pressure controller 38. The timing controller 36 outputs a drive current to each locking pin 14 and each of the electromagnetic on-off valves 22,.
Further, the pressure controller 38 outputs a current corresponding to the pressure command value to each pressure adjusting device 24, and sets the fluid output of the corresponding pressure adjusting device to the corrected pressure command value. As described above, the locking pin 14 and each weft insertion nozzle constituting the weft insertion member are corrected with the correction amount corresponding to the frequency of occurrence of the unwinding signal from the yarn supplying body for the set weft insertion condition. ,
Inject the fluid from the weft insertion nozzle according to the correction conditions,
Further, weft insertion can be performed by operating the locking pin 14.

It is known that the flight characteristics of the weft, that is, the flight speed of the weft, change in accordance with the winding diameter of the yarn feeder, and a delay occurs in the weft arrival timing at which the weft reaches the weave end. By doing so, the quality of the fabric is degraded due to weft insertion troubles and looseness of the weft. Therefore, when the weft insertion condition is changed in response to a change in the diameter of the yarn supplying body as in the present invention, for example, the following can be considered for setting the weft insertion condition to be changed.

For example, in the case of a weft in which the weft flight speed increases as the winding diameter of the yarn supplying body decreases, the injection pressure setting of the weft insertion nozzle, which is one of the weft insertion conditions, is as shown in FIG. However, as the winding diameter of the yarn supplying body decreases, in other words, as the interval between generations of the unwinding signal becomes shorter, the jet pressure from the weft insertion nozzle may be lowered to adjust the flight speed of the weft to a constant level. . Therefore, the correction signal generator 56 outputs to the main control device 32 a correction amount signal that decreases the command value of the injection pressure as the winding diameter decreases, in other words, as the generation interval of the unwinding signal decreases. The pressure adjustment can be realized.

As another weft insertion condition, by changing the injection period of the weft insertion nozzle, the timing at which the weft reaches the weave end can be made constant. That is, in view of the fact that the weft flight speed increases due to the decrease in the diameter of the yarn supplying body, the injection period of the weft insertion nozzle may be shortened. In this case, the correction signal generator 56 shortens the injection period by at least one of the injection start timing and the injection end timing of the weft insertion nozzle as the winding diameter decreases, in other words, as the generation interval of the unwind signal decreases. By outputting the correction amount signal to the main controller 32, the adjustment of the injection period can be realized.

Also, by changing the weft flight start timing as another weft insertion condition, the timing at which the weft reaches the weave end can be made constant. That is, the weft flight start timing may be delayed in anticipation of an increase in the weft flight speed due to a decrease in the diameter of the yarn supplying body. in this case,
The correction signal generator 56 controls the weft flight start timing, specifically, the retreat timing of the locking pin 14, the upstream main nozzle 15 as the winding diameter decreases, in other words, as the generation interval of the unwinding signal decreases. And sub-nozzle 1 located upstream
By outputting a correction amount signal for delaying the injection start timing such as 6 to the main controller 32, adjustment of the weft flight start timing can be realized.

The same applies to the case where the winding diameter is suddenly changed (increased) due to the switching of the yarn supplying body. Correction signal generator 5
6 increases the command value of the injection pressure of the weft insertion nozzle in response to an increase in the winding diameter, in other words, a sudden change (increase) in the generation interval of the unwinding signal, lengthens the injection period of the weft insertion nozzle,
Further, a correction amount signal for, for example, making the weft flight start timing earlier may be output to the main controller 32.

In the present embodiment, the frequency of occurrence of the unwinding signal is regarded as the interval of occurrence of the unwinding signal. However, the same applies to other replaceable elements, that is, the number of occurrences of the unwinding signal per unit time. You can think. A decrease in the generation interval due to a decrease in the winding diameter can be read as an increase in the number of occurrences, and a sudden change (increase) in the generation interval due to a change in the yarn feeder can be read as a sudden change (decrease) in the number of occurrences. May be set in accordance with.

When the relationship between the winding diameter of the yarn supplying body and the weft traveling speed is opposite to the case of the above-described weft, the above-mentioned weft insertion conditions may be set in reverse. That is, the weft insertion condition to be changed according to the frequency of occurrence of the unwinding signal may be set in consideration of the characteristics of the yarn type. In addition, any one of the weft insertion conditions listed above or a combination of two or more may be used. The above-described setting conditions for the weft insertion nozzles may be set individually for all the nozzles acting on the weft insertion, or may be simplified and set for only some of the nozzles. Therefore, the function setting unit 54 and the correction signal generator 56 that realize this may be provided for each weft insertion condition to be changed, or may be provided for each weft insertion member that changes the weft insertion condition, Needless to say, the present invention may be realized by a single component circuit capable of outputting outputs corresponding to a plurality of weft insertion conditions.

Even if the yarn supply 12a shown in FIG. 1 is exhausted and the weft is drawn out from the yarn supply 12b, as described above,
By changing the weft insertion condition according to the frequency of occurrence of the unwinding signal, the unwinding signal Sb is input to the detector 52 instead of the unwinding signal Sa. The occurrence frequency of the unwind signal can be measured. Therefore, even if a yarn feed change occurs, weft insertion can be performed promptly under the corresponding weft insertion conditions.

In the above embodiment, the weft insertion condition output means 50 is constituted in a form including the correction amount signal generator 56.
It may be configured not to include this signal generator. FIG. 5 shows the setting device 34 and the function setting device 5 of the above embodiment.
This is an example in which a weft insertion condition setting device 60 integrating these functions is configured in place of the function generator 4 and the function generator 56. Various weft insertion conditions corresponding to the frequency of occurrence of the unwinding signal are set in advance in the weft insertion condition setting unit 60, and various wefts corresponding to the input of the signal St from the detector 52, that is, the frequency of occurrence of the unwind signal, are set. By outputting the insertion condition to the main controller 32,
As in the case of the above embodiment, the weft insertion member can be driven.

In the above embodiment, an air jet loom has been described as an example, but the present invention can be similarly applied to other fluid jet looms, for example, a water jet loom.

The occurrence frequency of the unwinding signal of the yarn supplying body can be used for other purposes. For example, since the weft-inserted flying weft is caught by the locking pin 14 and hits the weft, a braking member that reduces the flying speed is provided between the weft length measuring device 13 and the main nozzle 15, Although the braking member acts on the weft before the leading end reaches the weaving end, the braking operation timing may be changed in accordance with the frequency of occurrence of the unwinding signal of the yarn supplying body. Furthermore, it is also conceivable to set and operate the operating conditions of the members related to weft insertion other than those described above in accordance with the frequency of occurrence of the unwinding signal of the yarn feeder.

Further, the frequency of occurrence of the unwinding signal of the yarn supplying member can be used to keep the weft winding tension on the weft measuring device 13 constant. That is, by changing the applied tension of a tension applying mechanism such as a leaf spring tensor disposed between the guide 44 and the weft measuring device 13 in accordance with the frequency of occurrence of the unwinding signal, the winding accompanying the unwinding balloon is changed. The change in the applied tension can be made constant.

Alternatively, it is also possible to accurately detect occurrence of yarn breakage in the yarn supplying body and timing of switching of the yarn supplying body by using the frequency of occurrence of the yarn supplying unwinding signal. That is, the determined occurrence frequency is compared with the set values corresponding to the detection of the yarn supply breakage or the switching of the yarn supply body, respectively, and the yarn supply breakage or the yarn supply change is detected based on the comparison result. It can also be used for loom control.

[0036]

As described above, according to the first aspect of the present invention, the weft insertion condition corresponding to the frequency of occurrence of the unwind signal is set in advance, and the frequency of occurrence of the unwind signal is adjusted during the weaving operation. Since the weft insertion member can be driven according to the weft insertion conditions, weft insertion can be controlled in response to changes in the state of weft unwinding from the yarn feeder with a simplified system configuration compared to conventional systems. No, weft insertion can be more stable. Further, the same effects as those of the first aspect can be obtained by the device according to the second aspect of the present invention.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a weft insertion device in an air jet loom.

FIG. 2 is a block diagram of a weft insertion condition output unit according to the present invention.

FIG. 3 is an explanatory diagram showing a method for determining the frequency of occurrence of unwinding signals according to the present invention.

FIG. 4 is a diagram showing a specific example of a weft insertion condition changed according to the occurrence frequency of the unwinding signal of the present invention and a setting thereof;
(A) corresponds to the injection pressure of the weft insertion nozzle, (b) corresponds to the injection period of the weft insertion nozzle, and (c) corresponds to the flight start timing.

FIG. 5 is a block diagram showing another configuration example of the weft insertion condition output means of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Loom 11 Weft 12a Yarn supply 12b Yarn supply 13 Weft length measuring device 20 Encoder 22 Electromagnetic on-off valve 24 Pressure regulator 25 Fluid supply source 30 Weft insertion drive means 32 Main control device 34,60 Weft insertion condition setting device 42 Solution Shut-off sensor 42a Light-emitter 42b Light-receiver 43 Unwind sensor 43a Light-emitter 43b Light-receiver 50 Weft insertion condition output means 52 Detector 54 Function setter 56 Correction signal generator 58 Operational unit CL1 Weft selection signal Sa Unwind signal Sb Unwind signal Sg Signal Ss1, Ss2 signal St signal Wd1 Winding command signal θ Crank angle signal

Claims (6)

[Claims] In a fluid jet loom for operating a weft insertion member in accordance with set weft insertion conditions, an unwinding sensor for detecting an unwound yarn from a yarn feeder corresponds to the yarn feeder. Arranged, the weft insertion condition is set in advance corresponding to the frequency of occurrence of the weft unwind signal from the unwind sensor, and the frequency of occurrence of the unwind signal is determined. A weft insertion method for a fluid jet loom, comprising driving a weft insertion member according to corresponding weft insertion conditions. 2. The weft insertion method according to claim 1, wherein the generation frequency of the unwinding signal is a time until the unwinding signal is generated a unit number of times. 3. The weft insertion method according to claim 1, wherein the frequency of occurrence of the unwinding signal is the number of occurrences of the unwinding signal per unit time. 4. The occurrence frequency of the unwinding signal is obtained in accordance with a weft winding command in a weft length measuring device interposed between the yarn supplying body and the weft insertion member. The weft insertion method according to 1, 2, or 3. 5. The weft insertion condition set in accordance with the frequency of occurrence of the unwinding signal is at least one of a weft flight start timing, an injection period of a weft insertion nozzle, and an injection pressure of a weft insertion nozzle. A weft insertion method for a fluid jet loom according to claim 1, 2, 3, or 4. 6. An unwinding sensor which is provided corresponding to a yarn supplying body and detects an unwound yarn from the yarn supplying body, and the unwinding signal is inputted to determine the frequency of occurrence of the unwinding signal and to respond thereto. And a weft insertion condition output means for outputting a predetermined weft insertion condition, and a driving means for driving a weft insertion member in accordance with the output weft insertion condition. Weft insertion device.