JPS6228443A - Pressure water feeder for wefting nozzle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a device for supplying pressurized water to a weft inserting nozzle of a water jet loom.

[Prior Art 1] A conventional apparatus for supplying pressurized water to a weft insertion nozzle is shown in FIG. 6, for example. A plunger pump 1 attached to the side of the frame sucks the water necessary for one buttock insertion from a constant water level @ (not shown) disposed below the side of the identification frame and presses it to 710. Pressure water is produced, and this pressure water is sent under pressure to a weft inserting nozzle 2 provided close to the warp 1 m section of the weave 1 on the upper surface of the frame through a pressure water guide pipe 3, and the pressure water is sprayed from the nozzle U= t, and the jetted water causes the yarn to be inserted into the space between the warp yarns. The details of the gate structure of the plunger pump 1 are shown in FIG. 7, and its operation will be explained. The drive cam 11 rotates once for every rotation of the loom, and rotates in the direction of the arrow in the figure. As the drive cam 11 rotates, the cam lever 12
When the cam lever 12 comes into contact with the cam roller, the cam lever 12 rotates counterclockwise, moving the plunger 13 of the plunger pump 1 to the right in the figure through the link structure, thereby drawing water into the plunger pump 1. . When the drive cam 11 further rotates and the highest part of the cam crest passes the contact position with the cam roller, the plunger 13 is rapidly moved to the left in the figure by the pump spring 14 built into the plunger pump 1, thereby reducing the pressure. Water is generated and this pressurized water is pumped to the weft inserting nozzle 2. Note that check valves 15 and 16 are provided at the water inlet and outlet of the plunger pump 1, respectively. In such a conventional pressurized water supply device to the weft insertion nozzle, the pressure of the pressurized water reaches its maximum value when the plunger begins to move when the pump spring is at its maximum deflection. The flow velocity of the jetted water generated by this process also reaches its maximum value, and the traction force on the weft yarn also reaches its maximum value. When the weft yarn is to fly, it is necessary to apply the maximum traction force to the weft yarn at the beginning, and therefore the pressure provided by the plunger pump is ideal for this starting point. [Problems to be Solved by the Invention] The pressure change of the pressurized water caused by the movement of the plunger pump described above gradually decreases as the plunger moves, but the pressure decreases due to the decrease in deflection of the pump spring as the plunger moves. The pressure gradient was not suitable for making the weft threads fly. In addition, there was a phenomenon in which water jetting continued even though the pressure had decreased and there was virtually no pulling force on the weft threads. [Means for Solving the Problems] This invention has been made by focusing on the above-mentioned problems of the conventional art, and involves jetting pressurized water from a weft inserting nozzle, and using this jetting water to move the weft threads into the openings of the warp threads. In a water injection loom that inserts the weft inside, an on-off valve is provided in the line that guides pressure water from the plunger pump to the nozzle for weft insertion, and the above problem is solved by controlling the opening degree of this on-off valve. The purpose is [Function] By systematically setting the pressure waveform generated by the action of the plunger driven by the pump spring by the action of the on-off valve, the conventional flying condition is improved and the pressure of the pressure water is applied to the weft. When the pressure drops below the pulling pressure, the on-off valve is closed to cut off the supply of pressurized water, and the jet flow that has lost its ability to pull the weft is stopped, thereby preventing this problem. [Example] This invention will be explained below with reference to the drawings. FIG. 1 is a diagram showing an embodiment of the present invention. 1 is a plunger pump attached to the side of the frame (not shown), which sucks the water necessary for one weft insertion from a fixed water level tank (not shown) arranged below the side of the eta frame. is pressurized to create pressure water, and this pressure water is fed through a pressure water guide pipe 3 to a weft inserting nozzle 2 provided close to the warp opening of the frame top loom, and from the nozzle. This apparatus is the same as the conventional apparatus shown in FIG. 4 in that pressurized water is injected and the weft is inserted into the warp opening using the injected water. The apparatus of the present invention is different from the conventional apparatus described above in that an on-off valve 4 is provided in the line of the pressure water guide pipe 3 that guides pressure water from the plunger pump 1 to the weft insertion nozzle 2. The details of the gate structure of the on-off valve 4 are shown in FIG. A valve center shaft 42 of the valve 41 is set movably in the axial direction by a center bearing 43, and the valve 41 is supported by a spring 44.
The valve seat 45 is pressed against the valve seat 45 by the valve seat 45. This contact force is greater than the maximum pressure of the pressurized water. A cam 47 is fixed to the cam shaft 46 in correspondence with the valve center shaft 42, and the cam shaft 46 rotates once per rotation in synchronization with the rotation of the weave. The spring bearing part 50 has a plurality of holes 48 as shown in FIG.
Similarly, several holes 49 are provided in the support portion 51 of the center bearing 43. Next, the operation of this device will be explained. When the cam shaft 46 rotates in the direction of the arrow in FIG.
As a result, the valve center shaft 42 is pushed up against the force of the spring 44, and the valve 41 is separated from the valve seat 45, creating a gap, and the pressure water guide pipe 3
The pressure water guided from the valve passes through the hole 49, passes through the gap between the valve and the valve seat, and then passes through the hole 48 to the pressure water guide pipe 3.
The weft is then supplied to the weft insertion nozzle 2. In case A in Fig. 4, the tip of the cam 47 is connected to the cam shaft 46.
In this case, the time valve 41 continues to have the maximum width because there is a portion 52 with equal distances from the center of the camshaft 46, but in the case of B, there are portions 52 with equal distances from the center of the camshaft 46.
2, the valve 41 will begin to close as soon as the maximum frontage is reached. Generally, the pressure waveform of the pressure water generated at the discharge portion of the plunger pump exhibits a substantially similar pressure waveform inside the weft insertion nozzle. A typical example of the nozzle internal pressure waveform is shown in FIG. 5 (the pressure waveform is wavy, but its average value seems to be approximately indicated by the double chain line). When the pressurized water is injected, the brush 1713 of the Brasi Bomb 1 starts to move rapidly due to the force of the pump spring 14, and the pressure of the pressurized water increases rapidly. However, since the force of the pump spring 14 also decreases as the brassiere 13 moves, the pressure waveform gradually decreases, and the pressure reaches zero at the final point of the brassiere's movement. In this example, the pressure of the pressurized water increases rapidly to 30Ky/aA, and then gradually increases to 20Ky/cII.
However, it has since declined rapidly. Generally 30K
When the pressure of the jetted water jetted at a pressure of y/aA decreases to a pressure of 20 kg/cm or less, the force of the jetted water to pull the weft threads is not working effectively. Therefore,
If the valve 41 closes at the point where the cam 47 has turned the angle α in FIG. 4A, this closes the valve 41 at the point A in FIG. 5, and the pressure waveform becomes as shown by the dotted line. Therefore, wasteful water injection after point A can be stopped, water used can be saved, and the adverse effects of wetting the warp opening and its surroundings can be reduced, and more importantly, the rise of such pressure waveforms can be reduced. By making the descent steeper, the flying condition of the warp threads can be improved. 1241-49). If the valve is set to start closing at the same time as the maximum frontage of the valve, as shown in the force l\ shape shown in Figure 4B,
As shown in the figure, the pressure waveform reaches the maximum pressure as shown by the dotted line, and at the same time the pressure rapidly drops due to the action of the valve, and the pressure reaches 20 kg.
The valve is closed at point 8 when the pressure of 1c shoulder is reached, so the pressure rapidly goes to O at this point. It is well known that a waveform in which the pressure gradient suddenly drops from its maximum value improves the flying condition of the weft thread (Text I!fn Mechanical Journal Vol. 130 No.
, 12, pp. 41-49), by creating a pressure waveform that cannot be created with a plunge 1-above by setting the on-off valve, it is possible to improve the stability of weft insertion. In addition, the current plunger pumps have extremely large spring constants in order to achieve this ideal pressure waveform, making it extremely difficult to operate the plunger pumps. Since this can be achieved by the action of the valve, there is also the advantage that the plunger pump can operate smoothly. Furthermore, in this embodiment, since the pressure waveform rises very rapidly by the plunger pump, the opening of the on-off valve may be performed at the same time as the start of the discharge stroke of the plunger pump, or prior to that. When the rise of the pressure waveform is slow, the rise of the pressure waveform can be made steeper by opening the on-off valve a little later than the start of the discharge stroke of the plunger pump. In this embodiment, the plunger pump was described as having check valves on the suction side and discharge side, as in the past, but in the case of this invention, an on-off valve is installed in the pressure water guide line. ,
It is desirable for the check valve on the discharge side to solve this problem and reduce the induced resistance of the pressure water. Effects of the Invention As described above, according to the present invention, the structure is a water injection type in which pressurized water is injected from the weft insertion nozzle and the weft is inserted into the warp opening using the jetted water. In the weaving weave, an on-off valve is installed in the path that guides pressure water from the plunger pump to the weft insertion nozzle, making the falling slope of the pressure waveform steeper and improving the flying condition of the weft yarn due to the jetted water. It has become possible. Also, the opening/closing time of the on-off valve. By arbitrarily setting the opening/closing degree, the pressure waveform of the pressure water passing through the opening/closing valve can be set appropriately, and a pressure waveform suitable for the type of yarn to be inserted can be obtained. or,
When the pressure of the pressurized water drops below the pressure that can pull the weft, the on-off valve installed in the pressure water guide pipe shuts off the supply of pressurized water and releases the jet water that has lost its ability to pull the weft. By stopping this, it is possible to reduce the waste of energy due to wasteful use of water and the harmful effects of wetting the warp opening and its surroundings.

[Brief explanation of drawings]

Fig. 1 is an overall explanatory diagram of the pressure supply device of the present invention, Fig. 2 is a cross-sectional view of the on-off valve of the present invention, Fig. 3 is a cross-sectional view taken along Fig. 2 - ■, and Fig. 4 A and B are 2 FIG. 2 IV-IV of two embodiments
5A and 5B are pressure waveform diagrams of pressure water, FIG. 6 is an overall explanatory diagram of a conventional pressure water supply device, and FIG. 7 is a sectional view of a plunger pump. 1...Plunger pump. 2... Nozzle for twilling, 3... Pressure water guide pipe. 4... Opening/closing valve, 41... Valve, 42... Valve center axis. 43...Center bearing, 44...Spring. 45...Valve seat, 46...Camshaft, 47...Cam. 48:...hole, 49...hole

Claims (4)

[Claims] (1) In a water injection loom that injects pressurized water from the weft insertion nozzle and inserts the weft into the warp opening using this jetted water, the system that guides the pressure water from the plunger pump to the weft insertion nozzle opens and closes. A pressurized water supply device to a weft insertion nozzle, characterized by being provided with a valve. (2) The opening degree of the on-off valve can be set arbitrarily, and by setting the opening degree of the on-off valve arbitrarily, the pressure waveform of the pressure water created by the plunger pump can be changed.
A pressurized water supply device to a weft insertion nozzle according to claim 1, characterized in that the pressure waveform can be changed to a required pressure waveform. (3) A pressurized water supply device for a weft inserting nozzle according to claim 1, wherein the opening/closing valve is controlled by a cam that rotates in synchronization with the rotation of the loom. . (4) The weft insertion nozzle according to claim 3, characterized in that the cam shape of the cam that rotates in synchronization with the rotation of the loom is set so that it starts to close at the same time as the pressure of the pressurized water reaches its maximum. Pressure water supply device to.