JP2001131849A - Relaxation device for weft overtension in center selvedge making section of multiple-tucking loom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the subject relaxation device intended for stable tuck-in operations without increasing air consumption or weft consumption in a multiple- tucking loom. SOLUTION: In a multiple-tucking loom having at least one tuck-in device situated within a weave width region and an air jet nozzle positionally fixed with respect to a reed and intended for generating air jet for bending a picked weft at a position against the tuck-in device, there is also provided a means for changing the jetting condition of the above air jet nozzle in response to the changeover of weaving conditions during weaving operations.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weft over-tension relieving device in a middle ear forming portion of a multi-width weaving loom, and more particularly, to a reed having at least one tack-in device located in a weaving area. In the multi-width weaving loom equipped with an air jet nozzle for generating an air flow for bending the inserted weft in a position opposed to the tuck-in device and reducing the over tension of the weft at the middle ear forming portion The present invention relates to the improvement of a device that performs

[0002]

2. Description of the Related Art Conventionally, a multi-width weaving machine provided with one or more tuck-in devices located in a weaving area and simultaneously weaving a plurality of woven fabrics separated at the position of the tuck-in device (middle ear forming portion) is known. Is well known and well-known.

In such a multi-width weaving loom, when weaving a woven fabric having a large shrinkage, the weft tends to be in an over-tension state at the middle ear forming portion between the woven fabrics. This is because the pulling of the temple loses the shrinkage,
This is due to the fact that the weft after weft insertion and beating is pulled by the shrinkage of the woven fabric located on both sides in the middle ear forming portion. As a result, before performing the tuck-in operation on the weft, the weft is cut off at the middle ear forming portion, and a problem occurs that normal formation of the middle ear cannot be performed.

To solve such a problem, Japanese Patent Laid-Open Publication No. Hei.
In the device proposed in Japanese Patent No. 64554, an air jet nozzle that swings together with a reed is provided at a portion facing the tuck-in device, and the weft inserted is bent by airflow to give looseness, thereby forming the middle ear. It has been practiced to prevent over-tension of the weft in the section.

[0005]

However, in the apparatus proposed in the prior art, there is no mention of the pressure and flow rate of air injected from the air injection nozzle or the injection timing of the air injection nozzle.

On the other hand, the amount of shrinkage of the woven fabric depends on the weaving conditions such as the type of weft used (stretchability, etc.), the density of the weft, the weaving pattern, and the number of revolutions of the loom. If weaving is performed using a combination of a high weft and a non-high weft, the weft shrinkage inevitably increases in the part where a lot of highly elastic yarn is inserted, compared to the part where it is not so. Accordingly, the degree of increase in the tension of the weft at the middle ear forming portion is further increased.

In such a case, if the pressure or the like of the air injected from the air injection nozzle is kept constant, problems such as a decrease in the accuracy of the tack-in operation and an increase in the amount of air consumption occur.

For example, if the pressure of the air to be injected is set in accordance with the weaving of the portion where the weave shrinkage is small, the weft in the portion where the weave shrinkage is large will have an insufficient amount of weft loosening. May cause the problem of breakage of the weft. In addition, when the pressure of the air is set in accordance with the weaving of the portion where the shrinkage is large, in the portion where the shrinkage is small, the jet is performed at a pressure more than necessary, and the air consumption increases, Since the weft is loosened (bent) more than necessary, the consumption of the weft is increased.

It is to be noted that, even if the amount of shrinkage of the weave is constant, weaving is performed by using a weft yarn that is easy to cut (thin or hard to stretch) and a weft that is hard to cut (thick or easy to stretch). The same is true in cases. This is because it is necessary to set a high pressure so as to increase the slack for a weft that is easy to break, but conversely, it is not necessary to provide a large slack for a hard to cut weft.

The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to provide an apparatus capable of performing a stable tuck-in operation without increasing air consumption or weft consumption. Is to do.

[0011]

To achieve the above object, the present invention comprises at least one tuck-in device located in a weaving area and is fixed to a reed by a weft insertion. In a multi-width weaving machine having an air injection nozzle for generating an air flow for bending the weft yarn at an opposed portion of the tack-in device, the injection condition of the air injection nozzle is changed according to a change in the weaving condition during weaving. A weft over-tension relieving device having a jet condition changing means for changing.

The "weaving region" here is not the region within the weaving width of each separated woven fabric, but the region where the entire woven fabric is woven, that is, the yarn feeding of the woven fabric on the most yarn supplying side. It means the area from the side end to the end opposite to the yarn supply side of the woven fabric on the most opposite yarn supply side. The "weaving conditions" include the weft density, the weaving pattern, the number of rotations of the loom, or, in the case of multicolor weft insertion, the type of weft used for weft insertion (stretchability, thickness (count)). , Etc.) and the weft insertion frequency of each weft. Further, the “injection conditions of the air injection nozzle” include at least one of the pressure, flow rate, or injection timing of the air to be injected, and an operation mode (whether or not to perform injection).

[0013]

According to the configuration of the present invention, even when the weaving shrinkage amount of the woven fabric changes due to the change of the weaving conditions during weaving, the air flow according to the state is changed. The injection from the air injection nozzle is performed according to the pressure, the flow rate, the injection timing, and the operation mode. In addition, in the case of multicolor weft insertion, even when wefts of different types (physical properties) are used in combination, it is also possible to cause the air injection nozzle to perform jetting at a pressure or jetting mode according to each weft inserted. it can. Therefore, a stable tuck-in operation can be performed while preventing an increase in air consumption and weft consumption.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIGS. 1 to 3 show an embodiment of the present application, in which the pressure of air injected from an air injection nozzle is changed in accordance with the type of weft inserted, that is, FIG. This is an example in which a pressure control unit is used as the injection condition changing unit.

As shown in the figure, the loom 10 is a double width air jet loom (FIG. 3). This loom 10 is provided with a lead holder RH supported on a locking shaft (not shown) via a sword S (FIG. 1).
A reed R fixedly supported by a lead gripper RG is provided upright on the lead holder RH. A weft insertion nozzle MN is provided on the lead holder RH.
Therefore, in the loom 10, the lead holder RH swings with the rotation of the rocking shaft, and at the same time, the reed R and the weft insertion nozzle MN swing. The weft insertion nozzle MN shown is for multicolor weft insertion, and the nozzle corresponding to the weft Y selected for weft injection ejects based on a weft selection signal from the loom controller. .

In the illustrated double width loom 10, the tuck-in devices 20a, 20a on the yarn supply side and the non-yarn supply side are used.
In addition to b, tack-in devices 20c and 20d for forming the middle ear are provided near the center of the weaving area CA (FIG. 3). Also, tack-in devices 20a, 20b, 20c,
20d is provided with a cutter CT for cutting the weft yarn Y introduced into each tuck-in device to an appropriate length on the non-woven cloth W side of the tuck-in device. However,
Cutter CT installed side by side with tack-in devices 20c and 20d
Is common to both tuck-in devices.

Each of the illustrated tuck-in devices is of a pneumatic type in which the end of the weft Y is blown into the warp opening by an air flow, and the weft Y inserted is inserted into a slit 21 provided in each of the slits. Is introduced along with the swing of the reed R,
After the weft Y is cut by the cutter CT on the non-woven cloth W side of the tack-in device at a predetermined timing, the end of the weft Y is blown into the opening of the next warp T into which the weft Y has been inserted by the injection of the tack-in nozzle 22. Can be put in. However, the tuck-in device of the present invention is not limited to this pneumatic device, but may be a mechanical device having a tuck-in needle.

Further, in the illustrated loom 10, the reed R and the tuck-in devices 20c, 20c of the middle ear forming portion are caused by the swing of the reed R.
d, so that the reed R does not interfere with the tuck-in device 20.
It is divided at a position facing c and 20d (FIG. 2). When the tack-in device is a mechanical type, the interval between the divided reeds R must be increased, which may hinder weft insertion. Therefore, in this case, the reed R is not divided and the tack-in device 2 is not divided.
Oc and 20d may be retracted from the interference position with the reed R by swinging or the like.

Further, the loom 10 is provided with an air injection nozzle 30 for loosening the inserted weft yarn Y. In the illustrated example, the air injection nozzle 30 is disposed on the front side (the cloth fell CF side) of the reed R so that the injection port 30a is directed to the weft guide groove RP of the reed R, and the air injection nozzle 30 is interposed through the bracket 31. , Sub nozzle SN of lead holder RH
Bolts 31a and nuts 31b
It is supported so that the position can be adjusted in the width direction.

The air injection nozzle 30 is provided with a tack-in device 20 in the longitudinal direction of the lead holder RH.
The two reeds R, which are arranged at positions opposite to c and 20d, act on the weft Y between the two divided reeds R.

The air injection nozzle 30 includes a solenoid valve 32,
Connected to the air supply source 13 via the pressure control valve 33 (FIG. 2), the air supplied from the air supply source 13 and regulated by the pressure regulating valve 33 is supplied to the air by opening and closing the solenoid valve 32. It is injected from the injection nozzle 30.

The opening and closing operation of the solenoid valve 32 is controlled by the injection control means 50. Injection control means 50
Is based on the timing signal TS from the loom control circuit 12, and after the weft insertion, the cutter C for the tack-in operation is
At a predetermined timing until the start of the cutting operation of T, the opening and closing operation of the electromagnetic valve 32 is performed. Further, the rotation angle θc of the main shaft 11 of the loom detected by the encoder EN is input to the loom control device 12, and the loom control device 1
2 outputs the timing signal TS at the above-mentioned predetermined timing based on the rotation angle θc of the main shaft 11.

In the weaving loom 10 having the above-mentioned construction, the present invention includes the pressure control means 40 for changing the pressure of the air output from the air injection nozzle 30 in accordance with the type of the selected weft yarn Y. Have been.

The pressure control means 40 comprises a setter 41 and a pressure controller 42 (FIG. 2). In this setter 41, a plurality of pressure values corresponding to a plurality of wefts Y to be used are set. ing. Further, the weft selection signal SS of the weft Y is sent from the loom control device 12 to the pressure controller 42 every time the weft is inserted.
Is entered.

According to this configuration, the pressure control means 40
First, when the weft selection signal SS is input to the pressure controller 42, the pressure controller 42 calls a pressure value corresponding to the selected weft Y from the setting device 41. And the pressure controller 42
Is based on the called pressure value.
To adjust. Thereby, the pressure of the air supplied from the air supply source 13 is adjusted to a value corresponding to the weft Y used for weft insertion, and the air injection nozzle 30 is
Supplied to

By performing the air injection from the air injection nozzle 30 in this manner, FIGS. 4A and 4B
As shown in (1), the weft Y after weft insertion is urged upward by the air current between the reeds R, and is bent and loosened.
Further, since the pressure of the air to be jetted is in accordance with the type of the weft yarn Y, the amount of slack does not exceed the required amount, and is suitable for each weft yarn Y. Therefore, without increasing the consumption of air and weft Y,
Weft breakage due to shrinkage of the woven fabric W can be reliably prevented.

In the above-described embodiment, the weft Y inserted
Although the pressure of the air injected from the air injection nozzle 30 is changed according to the type of the woven fabric, the pressure is changed according to the weft density (the number of wefts inserted per unit length) of the woven fabric to be woven. May be changed. This takes into account the difference in the amount of weaving shrinkage depending on the density, but in this case, weaving is not limited to weaving using a plurality of types of wefts as in the above-described embodiment, and weaving is performed using one type of weft. It also applies when performing.

In this case, a density selection signal from the loom control device 12 is input to the pressure controller 42 and the setting device 4
In 1, a plurality of pressure values according to the selected weft density are set. The switching of the pressure may be performed at the same time as the switching of the density, but the shrinkage occurs in the woven fabric W already woven, and immediately after the switching, the shrinkage of the woven fabric W woven at the previous density is performed. Therefore, it is desirable to perform the injection at a pressure corresponding to the previous density for a few picks after the switching of the density.

In addition to the above, the pressure may be changed according to a weaving pattern such as a weaving structure or the number of rotations of the loom. This takes into account differences in weaving shrinkage due to differences in the weaving structure and the number of revolutions of the loom, such as the weaving of a pile portion and a border portion in weaving of a towel. Also in this case, similarly to the above-described embodiment, a tissue selection signal or a rotation number selection signal is input from the loom control device 12 to the pressure controller 42, and the selected weaving tissue and rotation speed are input to the setter 41. A plurality of pressure values are set according to the number. Further, the pressure may be switched at the same time as the switching of the woven tissue, or may be performed several picks after the switching.

Further, in the case of weaving using a combination of a highly elastic weft and a non-elastic weft, weaving shrinkage due to the weft insertion frequency of the highly elastic weft is taken into consideration, The pressure value and the pick number corresponding to the pressure value may be set, and the pressure may be changed based on the pick signal from the loom control device 12.

[0032]

Next, another embodiment of the present invention will be described with reference to FIGS. Illustration and description of the same parts as those in the above-described embodiment will be omitted.

In the example shown in FIG. 5, the flow rate of the air injected from the air injection nozzle 30 is changed in place of the above-described pressure change. In the case of this embodiment, as shown, a throttle valve 35 is interposed between the air injection nozzle 30 and the solenoid valve 32, and the throttle amount of the throttle valve 35 is controlled by a flow control as an injection condition changing means. It is prepared by means 90. In the illustrated example, a setter 34 is attached to the pressure adjusting valve 33, and the pressure adjusting valve 33
Adjusts the air supplied from the compressed air supply source 13 to a pressure preset in the setting device 34 and supplies the pressure to the electromagnetic valve 32.

The flow rate control means 90 comprises a setter 91 and a flow rate controller 92. The setter 91 is set with a throttle amount corresponding to each weaving condition in each case as described above. Further, the selection signal SS of each weaving condition is input to the flow controller 92 in the same manner as described above. Then, according to this configuration, the throttle valve 35 is adjusted according to the selected weaving condition, and the flow rate of the air injected from the air injection nozzle 30 is adjusted according to the weaving condition. Is obtained.

The means for changing the flow rate is not limited to the one provided with the above-described throttle valve. For example, the air injection nozzle 30 is configured so that the diameter of the injection port 30a can be electrically varied. The diameter may be changed to change the flow rate. Further, a plurality of air injection nozzles may be provided, and the flow rate may be changed by changing the number of air injection nozzles.

FIG. 6 shows an example in which the air injection nozzle 3 is used as the injection condition changing means in accordance with the type of the selected weft yarn Y.
This is an example including an injection control unit 60 for selecting whether or not to perform zero injection.

The injection control means 60 comprises a setting device 61 and an injection control device 62.
The operation mode (setting whether or not to perform the injection operation, ON when performing the injection operation, OFF when not performing) is set for each of the plurality of wefts Y to be used. In addition, the injection controller 62 includes a loom control device 1 for each weft insertion.
2, the weft selection signal SS of the weft Y is input.

According to this configuration, first, when the weft selection signal SS is input to the ejection controller 62, the pressure controller 60 determines whether the operation mode for the selected weft Y is ON. Call off or not. When the operation mode is ON, the injection controller 62 opens and closes the electromagnetic valve 32 at a predetermined timing based on the timing signal from the loom control device 12, and the air injection nozzle 3
An injection of air from zero is performed. The operation mode is OF
In the case of F, the injection controller 62 does not perform the opening / closing operation of the electromagnetic valve 32, and the air injection from the air injection nozzle 30 is not performed.

Therefore, according to this configuration, for example, when using a weft that is hard to be cut even under the influence of weaving shrinkage, it is possible to prevent the jetting, thereby reducing the consumption of air and the weft. Can be.

In this embodiment, whether or not to perform injection is selected. Alternatively, as shown in FIG. 7, injection timing such as injection start timing may be changed. In this case, an injection timing control unit 70 is provided as the injection condition changing unit.

The injection timing control means 70 sets the start and end timings of the injection corresponding to each of the plurality of wefts Y used in the setter 71, and the injection controller 72 outputs the selection signal SS to the selection signal SS. When the injection timing set for the selected weft Y matches the rotation angle θc of the main shaft 11, the solenoid valve 32 is opened and closed.

According to this configuration, for example, the setting of the injection start timing for the hard-to-cut weft is set sufficiently later than that for the easy-to-cut weft, so that the looseness given to the hard-to-cut weft is set. Can be reduced, and the consumption of air and weft can be reduced.

[0043]

[Other Embodiments] In the embodiment described above, any one of the injection conditions such as the pressure and flow rate of the air injected from the air injection nozzle, the injection timing of the air injection nozzle, and the operation mode is used as the weaving condition. However, in the present invention, the injection condition changed at one time is not limited to any one of the above, and at least two of the weaving conditions may be changed at the same time, For example, the pressure and the flow rate, the pressure and the injection timing, or the flow rate and the injection timing may be changed in various combinations. In this case, at least two of the pressure control means, the flow rate control means, the injection control means, and the injection timing control means in the above-described embodiment are arranged in parallel.

In the above embodiment, as shown in FIG.
Although the air injection nozzle is arranged on the cloth fell CF side of the reed R, the present invention is not limited to this. For example, as shown in FIG. The air injection nozzle 80 which injects air toward the air may be used. The illustrated air jet nozzle 80 is supported by a bracket 81 that is provided upright in a groove in which the lead gripper RG of the lead holder RH is mounted.
Of the weft guide groove RP.

In the above embodiment, the loom 10 has been described as a double-width loom. However, the multiple-width loom of the present invention is not limited to this, and three or more tack-in devices are provided in the weaving area. It may be a weaving machine of width or more.

Further, although the reed is divided at a position facing the tuck-in device for forming the middle ear, the present invention is not limited to this. The reed does not interfere with the tuck-in device when the reed swings. With the configuration, the reed need not be divided, and may be a single reed extending over the weave width.

The present invention is not limited to any of the above-described embodiments, and can be variously modified without departing from the gist of the present invention.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional side view showing an embodiment of the present invention.

FIG. 2 is a front view including a block diagram showing an embodiment of the present invention.

FIG. 3 is a plan view showing an embodiment of the loom of the present invention.

FIG. 4 is an operation explanatory diagram according to the embodiment of the present invention.

FIG. 5 is a block diagram showing another embodiment of the present invention.

FIG. 6 is a block diagram showing another embodiment of the present invention.

FIG. 7 is a block diagram showing another embodiment of the present invention.

FIG. 8 is a side view showing another embodiment of the air injection nozzle of the present invention.

[Explanation of symbols]

 10 Looms 20a, 20b, 20c, 20d Tuck-in device 30, 80 Air injection nozzle 40 Pressure control means 50, 60 Injection control means 70 Injection timing control means 90 Flow control means Y Weft T Warp W ... Woven cloth R ... Reed CA ... Weaving area CT ... Cutter

Claims (6)

[Claims] 1. An air jet that includes one or more tuck-in devices located in a weaving area and generates an air flow for bending a weft inserted and fixed in position with respect to a reed at a portion facing the tuck-in device. In a multiple width weaving loom equipped with a nozzle, the injection conditions of the air injection nozzle,
A weft over tension relieving device in a middle ear forming section of a multi-width weaving machine, comprising an injection condition changing means for changing in accordance with a change in weaving conditions during weaving. 2. The middle ear forming machine according to claim 1, wherein said injection condition changing means is a pressure control means for changing a pressure of air injected from said air injection nozzle. Weft over tension relieving device in section. 3. The middle ear forming machine according to claim 1, wherein said injection condition changing means is a flow control means for changing a flow rate of air injected from said air injection nozzle. Weft over tension relieving device in section. 4. The weft in the middle ear forming section of a multi-width weaving loom according to claim 1, wherein said injection condition changing means is injection timing control means for changing the injection timing of said air injection nozzle. Over tension relief device. 5. The weft over-tension in the middle ear forming section of the multi-span weaving machine according to claim 1, wherein the injection condition changing means is an injection control means for switching an operation mode of the air injection nozzle. Mitigation device. 6. The apparatus according to claim 1, wherein said injection condition changing means includes a combination of at least two of said pressure control means, flow rate control means, injection timing control means and injection control means. A weft over tension relieving device in a middle ear forming section of the multiple width weaving loom as described in the above.