JPH0139725Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a fluid supply device for a fluid jet loom.

BACKGROUND OF THE INVENTION Generally, in a fluid jet loom, a predetermined amount of weft yarns are stored, and the stored weft yarns are injected from a main weft insertion nozzle into a warp opening. For example, as shown in Figure 1,
When the gripper 2, which opens and closes in synchronization with the rotation of the loom, is closed, the weft yarn Y supplied from the weft supply unit 1 is ejected from the storage nozzle 4 toward the storage pipe 5 while being measured by the length measuring roller mechanism 3. stored. When a predetermined amount of the weft Y is stored and the gripper 2 is opened, the main nozzle 6 injects the weft into the weft guide path S formed by the weft guide members 8 arranged in parallel on the slay 7. be done.
After weft insertion is completed, the reed is beaten with the reed 9,
The weft yarn Y is cut by a cutter (not shown) provided near the main nozzle 6.

By the way, the supply of compressed fluid for injecting the weft yarn Y from the main nozzle 6 is intermittently performed in synchronization with the rotation of the loom in order to prevent the weft yarn Y from being cut by the injection pressure within the nozzle 6. It will be done. That is, if the compressed fluid is constantly injected from the main nozzle 6 at high speed, the weft tip in the main nozzle 6 will untwist, the yarn strength will decrease, and weft breakage will likely occur due to the high speed injection. Therefore,
The high-speed injection of compressed fluid from the main nozzle 6 is performed only during weft insertion, that is, only when the gripper 2 is open. However,
In such a configuration in which weft yarn breakage within the main nozzle 6 is prevented, a new problem occurs as described below. That is, when the gripper 2 is closed, compressed fluid is not injected from the main nozzle 6, so that the weft tip extending from the tip of the main nozzle 6 is in a drooping state.
Therefore, when the weft thread is inserted, there is a risk that the leading end of the weft thread may catch on the warp thread that is being opened or collide with the weft guide member 8, making it impossible to perform normal weft insertion.
Further, if no injection pressure is applied to the inserted weft after weft insertion, the weft tension will decrease, and there is a risk that the weft will not be cut properly by the cutter (not shown) after beating.

In order to eliminate such defects, it is conceivable to supply high-speed fluid to the main nozzle 6 during the weft insertion period, and to supply low-speed fluid at other times. As an example of this, as shown in FIG. 1, a high speed fluid passage 11 and a low speed fluid passage 1 are connected to a sub tank 10 connected to a fluid supply source (not shown).
2A and 12B, and these fluid passages 1
1, 12A, and 12B are connected to the main nozzle 6.
Presented in 36243. A rotary valve 14 operatively connected to the rotational drive source of the loom is interposed in the high-speed fluid passage 11, and the high-speed fluid passes through the confluence passage 13 based on the rotational operation of the valve 14 in synchronization with the rotation of the loom. It is supplied to the main nozzle 6. Further, the low-speed fluid passages 12A and 12B are joined to the low-speed fluid passage 12 via a push button type switching valve 15, and the flow rate of the fluid passing through the low-speed fluid passage 12A is controlled by a flow rate control valve 16, so that the low-speed fluid The flow rate of the fluid passing through the passage 12B is controlled by a flow rate control valve 17. In the state shown in FIG. 1, the low-speed fluid supplied from the low-speed fluid passage 12A is constantly injected from the main nozzle 6, and even when the gripper 2 is closed, injection pressure is applied to the weft Y, and the same weft The tip of the Y is blown away without hanging down. Therefore, during weft insertion, the same weft yarn Y does not get caught on the warp yarns or collide with the weft yarn guide member 8, and is inserted normally. On the other hand, when the button 15a of the switching valve 15 is pressed, the low-speed fluid passage 1
2B to the main nozzle 6, and this operation is performed when inserting the weft yarn into the main nozzle 6.

As described above, the example shown in FIG. 1 has excellent effects of preventing cutter trouble, preventing weft insertion errors, and facilitating the work of inserting the weft into the main nozzle 6. Another new problem has arisen. The problem is a delay in the rise of the injection pressure in the main nozzle 6. Low speed fluid passage 12 and high speed fluid passage 1
1 merges into the merging passage 13 through a connecting fitting 18, but the low-speed fluid passage 12 and the merging passage 13 are formed of the same pipe, and the low-speed fluid passage 1
The cross-sectional area of 2 and the cross-sectional area of the merging passage 13 are equal.
Therefore, when the rotary valve 14 is opened and high-speed fluid starts to be supplied to the main nozzle 6, when the fluid moves from the high-speed fluid passage 11 to the merging passage 13, a non-negligible amount of high-speed fluid is transferred to the low-speed fluid passage 12 side. This phenomenon causes a delay in the rise of the injection pressure in the main nozzle 6. In order to cope with this delay in the rise of the injection pressure, it is necessary to accelerate the opening timing of the rotary valve 14, but such a countermeasure means that the tip of the weft Y is blown away with high-speed fluid before weft insertion, and the tip This promotes untwisting of the yarn, leading to an increase in weft breakage.

Purpose The present invention was developed in consideration of the above-mentioned problems, and its purpose is to improve the startup delay of the high-speed jet for weft insertion in the main nozzle, and to prevent weft yarn breakage in the same nozzle. Another object of the present invention is to provide a fluid supply device for a fluid injection type loom, which can reduce consumption of injection fluid.

Configuration In order to achieve the above object, the present invention provides a fluid supply device in which a passage in which a low-speed fluid passage and a high-speed fluid passage are merged is connected to a main nozzle for weft insertion, in which the low-speed fluid passage is constantly in communication with fluid. The low-velocity fluid passage cross-sectional area is made smaller than the merging passage cross-sectional area near the connecting portion of each passage.

Embodiment Hereinafter, an embodiment embodying the present invention will be described as 2nd and 3rd embodiments.
The explanation will be made based on the drawings, and the same parts as the conventional structure are given the same reference numerals, and detailed explanation thereof will be omitted.

Now, in this embodiment, the inner diameter C of the pipe forming the low-speed fluid passage 12 is set smaller than the inner diameter D of the pipe forming the merging passage 13, and with this configuration, the flow from the sub-tank 10 to the high-speed fluid passage 11 is set smaller.
The resistance of the pipe to the high-speed fluid supplied to the main nozzle 6 through the confluence passage 13 is reduced. That is, in the conventional configuration in which the inner diameter of the low-speed fluid passage 12 and the inner diameter of the high-speed fluid passage 11 were the same, when the high-speed fluid starts to be supplied to the main nozzle 6, it flows into the low-speed fluid passage 12 side, and the inner diameter of the high-speed fluid passage 11 is the same. Compared to the conventional configuration in which the rise of the injection pressure at the main nozzle 6 is delayed, in the present invention, it is difficult for the high-speed fluid to flow into the low-speed fluid passage 12 side, and the rise of the injection pressure at the main nozzle 6 is faster. For example, when the injection pressure is 2Kg/cm ² , the inner diameter C of the low-speed fluid passage 12
The results show that the injection pressure rise time at about 0.4 times the inner diameter D of the merging passage 13 is shortened to about 0.6 times the rise time in the conventional configuration, and the improvement of the injection pressure rise characteristics in the main nozzle 6 is It is remarkable.

Such an improvement in the injection pressure rise characteristic in the main nozzle 6 brings about an effect that can solve the problems in the conventional configuration. As described in the prior art, the provision of the high-speed fluid passage 11 and the low-speed fluid passages 12, 12A, and 12B is used to prevent weft yarn breakage at the start of high-speed fluid injection in the main nozzle 6, to prevent weft insertion errors, and to prevent weft insertion errors after weft insertion. Although problems such as weft cutting problems and ease of thread threading can be solved, the improvement of the injection pressure rise characteristic at the start of weft insertion in the present invention is based on these advantages and is based on the injection pressure in the main nozzle 6. This brings about effects such as further prevention of the weft breakage phenomenon and reduction of compressed fluid consumption. In other words, by improving the injection pressure rise characteristics in the main nozzle 6, it is no longer necessary to increase the opening timing of the rotary valve 14 in response to the injection pressure from the main nozzle 6, and the time during which the weft is exposed to the high-speed fluid at the start of weft insertion is reduced. It becomes less. Therefore, there is no possibility that the weft tip will be untwisted, and the weft breakage phenomenon due to this untwisting phenomenon is prevented. Further, since it is not necessary to greatly advance the opening timing of the rotary valve 14, the amount of high-speed fluid supplied can be reduced, and the amount of compressed fluid consumed can be reduced.

The fluid supply device of the present invention improves the delay in the rise of high-speed fluid injection pressure, which was a problem in a configuration with a high-speed fluid passage and a low-speed fluid passage. It is possible to reduce the amount of
This can also contribute to eliminating the negative impact on the woven fabric or the reduction in operating efficiency caused by machine stoppage due to weft breakage.

In the embodiment described above, in order to prevent high-speed fluid from flowing into the low-speed fluid passage 12 side, the inner diameter of the pipe forming the low-speed fluid passage 12 was made smaller than the inner diameter of the pipe forming the merging passage 13. This means that the cross-sectional area of the low-speed fluid passage is smaller than the cross-sectional area of the merging passage, and the present invention is not limited to setting the inner diameter of the pipe forming the fluid passage. For example, the above-mentioned effects can also be obtained when only the inner diameter of the connecting portion of the low-speed fluid passage 12 to the connecting fitting 18 is made smaller than the inner diameter of the merging passage 13. Furthermore, in the embodiment described above, the pipes forming the low-speed fluid passage 12 and the merging passage 13 are screwed into the input port 18a and the output port 18b of the connecting fitting 18, respectively. In the connection form screwed onto the outer periphery, both ports 18a, 1
The cross-sectional area of the passage 8b determines the injection pressure rise characteristics in the main nozzle 6. That is, the rise characteristics are controlled by the fluid passage cross-sectional area near the connecting portion of each passage 11, 12, 13.

In the present invention, a flow control valve is provided in the vicinity of the connecting fitting 18 of the low-speed fluid passage 12, and if the control valve is adjusted, the flow of high-speed fluid into the low-speed fluid passage can be similarly effectively prevented.

Effects As detailed above, the fluid supply device of the present invention has the advantage of being able to improve the injection pressure rise characteristics at the start of weft insertion, thereby reducing the weft breakage phenomenon in the main nozzle and the consumption of compressed fluid. It has a great effect.

[Brief explanation of the drawing]

Fig. 1 is a schematic front view showing a conventional fluid supply device, Figs. 2 and 3 show an embodiment embodying the present invention, Fig. 2 is a schematic front view of main parts, and Fig. 3 is a high-speed FIG. 3 is a partially cutaway main part front view showing a connecting portion of a fluid passage, a low-speed fluid passage, and a merging passage. Main nozzle 6, high-speed fluid passage 11, low-speed fluid passage 12, 12A, 12B, merging passage 13, connecting fitting 18, inner diameter C, D, weft Y.

Claims (1)

[Scope of utility model registration request] The main nozzle for weft insertion is used to insert the weft drawn from the weft supply unit fixedly placed on the side of the loom into the warp opening, and the cutter is used to cut the weft after insertion to prevent errors in weft insertion. In a fluid supply device for a fluid injection type loom, in which a low-speed fluid passage for preventing trouble or for inserting the weft into a main nozzle for weft insertion, and a convergence passage of a high-speed fluid passage for weft insertion, the low-speed fluid passage is connected to a high-speed fluid passage for weft insertion. A fluid supply device for a fluid injection type loom, characterized in that the fluid supply device is configured to constantly communicate with fluid, and the cross-sectional area of the low-speed fluid passage is smaller than the cross-sectional area of the merging passage in the vicinity of a connecting portion of the respective passages.