JPS6332901B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a weft insertion method and apparatus for a fluid jet loom.

As looms become faster as they are today, the looms require several rotations from the time they are started until they reach a steady state of operation. For this reason, even if the weft pulling force is the same as during steady operation when starting the loom, if the unrestrained weft is injected from the main nozzle, the rotation speed of the loom's main shaft will be slow, so the timing should be adjusted from the loom's main shaft. A problem arises in that various devices related to the operating weft cannot be synchronized, causing various troubles. For example, in a type of loom that performs weft insertion only by jetting the main nozzle, there is a problem that the period with the filler installed on the opposite side of the weft insertion cannot be maintained. In the case of a type of loom that performs weft insertion, there is a problem that the period between the weft yarn and the sub-nozzle jet cannot be maintained.

The present invention will be described in more detail below, taking as an example the periodicity problem between weft yarns and sub-nozzle jets in the latter type of loom.

In a type of fluid jet loom that performs weft insertion by spraying from a main nozzle and a plurality of sub-nozzles, the weft yarn pulled out from the weft yarn feeder is measured to the length necessary for one weft insertion. Thereafter, the weft is temporarily stored in the weft storage device, and then sent into the warp shedding by jetting from the main nozzle. Then, the weft yarn flies through the warp opening while the weft tip is stretched with the help of relay jets from a plurality of sub-nozzles.

In this type of fluid jet loom, jetting from the main nozzle and relay jetting from the plurality of sub-nozzles are performed when the crank angle of the main shaft of the loom reaches a predetermined angle.

Therefore, during the several revolutions from the start of the loom to steady operation, the weft flying speed from the main nozzle is the same as during steady operation, but because the rotation speed of the main shaft of the loom is slow, the speed of the sub nozzle is When the jetting timing is delayed and the weft tip reaches the position of the sub-nozzle, the sub-nozzle is in a state where no jetting is performed.

For this reason, the weft tips end up flying through the warp shedding without being fully stretched. If this happens, the tip of the weft yarn may be bent, causing problems such as weft beating in this bent state.

The object of the present invention is to eliminate troubles related to weft insertion that occur due to a delay in the rotational speed of the main shaft of a loom from the time the loom starts until it reaches steady operation.

The gist of this invention is to reduce the flying speed of the weft yarn injected from the main nozzle from the start of the loom operation to the time of steady operation by adding resistance to the weft yarn than during steady operation. That is.

The present invention will be explained in more detail below based on the accompanying drawings.

FIG. 1 shows an apparatus used in the weft insertion method for a fluid jet loom according to the present invention. That is, a gripper 5 is provided between the main nozzle 1 and the weft storage device 3, and between the gripper 5 and the weft storage device 3, fluid is supplied in a direction different from the weft delivery direction of the main nozzle 1. A second fluid injection nozzle 2 is provided which applies resistance to the weft yarn by injecting it. The weft once stored in the weft storage device passes through the second nozzle 2 and further reaches the main nozzle 1 via the gripper 5.
When the fluid is injected from the main nozzle 1, the weft yarn Y flies through the warp shedding 10 riding on this fluid and the fluid injected from the sub nozzles 8 which are injected in groups at predetermined timing.

By the way, as mentioned above, the rotation of the main shaft of the loom is slow from the start of the loom until it reaches steady operation, so even if the weft is jetted from the main nozzle 1 and reaches the inside of the warp opening 10, the jetting from the sub nozzle 8 is slow. Yes, it has not been done yet. In this way, the weft yarn Y jetted with a jetting force equivalent to the jetting force during steady operation will not receive the auxiliary jetting from the sub-nozzle 8 and will fly with its tip bent.

Therefore, from the start of the loom until it reaches steady operation, fluid is injected from the second fluid injection nozzle 2 in a direction different from the weft drawing direction. In this way, when the main nozzle 1 pulls out the stored yarn, pull-out resistance is applied.

For this reason, the flying speed of the weft yarn Y jetted from the main nozzle 1 decreases, and as a result, the weft yarn tip
This means that the jetting pattern does not precede the jetting pattern of the sub-nozzle.

After starting the loom and entering a steady operating state, the nozzle 2 stops spraying. Then, after steady operation, the main nozzle 1 will be able to pull out the weft yarn from the storage device with the conventional pull-out resistance without additional resistance, and will feed the weft yarn during the relay injection of the sub-nozzle 8.

In the above description, the second fluid injection nozzle 2 is provided between the gripper 5 and the weft storage device 3, but the invention is not limited to this, and the second fluid injection nozzle 2 may be provided between the main nozzle 1 and the gripper 5. Of course it's a good thing.

Further, in the above description, the weft thread is inserted into the second fluid injection nozzle 2, but the invention is not limited to this.

That is, as shown in FIG. 2, the second fluid injection nozzle 21 is connected to the weft storage device 3 in order to increase the resistance to pulling out the weft from the weft storage device 3 from the start of the loom to the steady operation. It may be provided so that the ejection direction is the same as that of the storage fluid ejection nozzle 31.

First, the weft yarn whose length has been measured by a length measuring device (not shown) is sent into the storage device 3 by injection from the storage injection nozzle 31 and stored therein. The second fluid injection nozzle 21 is used from the start of the loom until it reaches steady operation.
is injected. At this time, since the weft on the length measuring device side is restrained by the length measuring device, when fluid is jetted from this second fluid jet nozzle 21, the main nozzle 1
Tension is applied to the weft yarn as it is being pulled out by the jetting force. For this reason, pull-out resistance is applied to the weft yarn being pulled out from the main nozzle, and the flying speed of the weft yarn becomes smaller than that during steady operation. After steady operation, if the setting is made so that the fluid is not injected from this second fluid injection nozzle 21 as in the case described above, during steady operation, almost no weft pulling resistance is applied to the weft, and normal weft insertion is possible. can do.

According to the fluid injection weft insertion method of the present invention, resistance is applied to the weft drawing from the main nozzle after the loom is started until the loom enters a steady operating state. Therefore, during this period, the weft that is injected from the main nozzle with the same injection force as during steady operation runs ahead of the injection from the sub-nozzle, and when the weft tip passes through the sub-nozzle, there is no chance of weft.

In this invention, it is sufficient to set the second nozzles 2 and 21 to spray only after the loom starts and until the loom enters a steady operation state, but in reality, even if the operation start button is pressed, this will not occur. At the same time the second
This does not mean that the nozzle 2 or 21 starts spraying. Therefore, it is preferable to set the injection timing of the nozzle 2 or 21 so that the injection command is issued by pressing the operation preparation button that is operated before pressing the operation start button.

In the above, we have explained the case where a fluid injection nozzle is used to add resistance to the weft thread withdrawal as a method of slowing down the flying speed of the weft thread. You may also apply

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a weft inserting device for a fluid jet loom according to the present invention, and FIG. 2 is a plan view showing a second embodiment of the weft inserting device for a fluid jet loom according to the present invention. DESCRIPTION OF SYMBOLS 1...Main nozzle, 2, 21...Second fluid injection nozzle, 3...Weft storage device, 5...Gripper, 8...Sub nozzle, 10...Warp opening, 3
1... Storage injection nozzle, Y... Weft thread.

Claims (1)

[Scope of Claims] 1. The flying speed of the weft injected from the main nozzle is made slower than during steady operation by adding resistance to the weft pull-out during the period from the start of loom operation to steady operation. A weft insertion method for a fluid jet loom, characterized by: 2. Second nozzles 2 and 21 are provided at predetermined positions between the main nozzle 1 and the weft storage device 3 in order to spray fluid in a predetermined direction different from the fluid spray direction of the main nozzle. A weft insertion device for a fluid injection type loom, characterized in that fluid is injected from the second nozzle to provide resistance to the weft yarn in a direction different from the weft withdrawal direction of the main nozzle during the period from the time to steady operation. . 3. A weft yarn passes through the second nozzle 2, and the fluid jetting direction of the second nozzle 2 is set to be opposite to the jetting direction of the main nozzle 1. A weft insertion device for a fluid jet loom according to scope 2.