JPS61113857A - 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 [Field of Industrial Application] The present invention relates to a weft insertion nozzle in a water jet loom. [Prior Art] As a weft insertion nozzle commonly used in the past, there is one shown in FIG. 4, for example. Nozzle body 31
An orifice 33 is formed by the needle 32, and pressurized water sent from a water jet pump (not shown) is injected from this orifice 33. A weft hole 34 for passing the weft Y is provided in the center of the needle 32.
always passes through this weft hole 34, so when pressurized water is jetted from the orifice 33, the jetted water joins the weft Y, wraps around the weft Y, pulls it, and flies it into the opening of the warp. It is designed to let you do so. However, in such conventional weft inserting nozzles, when the weft yarn and the jet water merge, they are immediately released into the atmosphere, and the jet cross section of the jet water jetted from the orifice has a hollow annular shape. , because the wall thickness is very thin, the jet water causes a so-called bump-like (explosion) phenomenon shortly after jetting, and for this reason, the jet water leaves the weft and spreads, reducing the tension on the weft, and furthermore, the diffused water causes the warp to I rarely had the problem of getting other parts wet. As a means to solve this problem, the patent application No. 59-907
80 (Application dated May 7, 1959) "Weft insertion nozzle"
has been proposed by the inventor of the present invention, and shows a method of preventing the bulging (explosion) phenomenon by guiding jet water that is jetted in an annular shape from an orifice with a cylindrical body having a cross-sectional area close to the cross-sectional area of the orifice. However, with this method, S(
It was still insufficient to prevent the explosion phenomenon. (Problem to be Solved by the Invention 1) The purpose of the present invention is to more completely prevent the occurrence of bump-like (explosion) phenomena using a simpler method. Means] In a weft insertion nozzle that inserts the weft by surrounding the weft with jet water, the jet water jetted in an annular shape after the confluence of the weft and jet water is formed into a rod-shaped water column with a circular cross section. In order to make the transition to the jet water, a jet water convergence and rectification member was provided to focus and rectify the jet water. The jetted water is focused, rectified, and jetted from a weft inserting nozzle in the form of a rod-shaped water column with a circular cross section. (Embodiment) An embodiment of the present invention will be described based on the drawings. Fig. 1 1 is a longitudinal cross-sectional view of one embodiment of the present invention.The nozzle body 3 has an elongated hollow hole 1 extending in the axial direction, and the tip of the cough hollow hole 1 forms a tapered portion 2. A needle 5 having an elongated weft hole 4 extending in the axial direction is fitted into the inner and outer hole 1 in the same manner as the nozzle body 3, and a needle tip 6 of the needle 5 having the weft hole 1 (4) is inserted into the tapered part 2 of the nozzle body 3. is inserted into the nozzle body 1 to form an orifice 7 between the nozzle body 1 and the needle 2.
It communicates with a fluid reservoir 9 provided on the outer periphery of. Reference numeral 10 denotes a bracket having a fluid guiding pipe 11, which is pressed against a stepped portion 12 of the nozzle body 3 by a fixture 13 so that the fluid guiding pipe 11 and the fluid storage portion 9 face each other. The fluid guide pipe 11 communicates with a pressure source (not shown). Opposed to the tip of the orifice 7, a jet water focusing and rectifying member 14 is installed on the nozzle body 1 so as to have the same central axis as the nozzle body 1.
A jet water guide hole 16 is provided at the center of the jet water converging and rectifying member 14, which is threaded by a screw portion 15, and the diameter of the jet water guide hole 16 gradually decreases in the direction perpendicular to the jet water. It consists of a focusing part 17 and a hole of a rectifying part 18 whose diameter is always kept substantially equal. The jet water converging and rectifying member 14 is set a little apart from the orifice 7, as shown in FIG. In some cases, it is provided subsequently. In addition, there is a backflow water bed fitting 20 on the weft inlet side of the needle 5.
A backflow water extraction device consisting of a extraction pipe 21 and a extraction pipe 21 is installed. The thin annular jet water jetted from the orifice 7 passes through the gap 19 or directly through the convergence section 17 that reduces the passage cross-sectional area in the direction of movement, and is focused and guided to the rectification section 18. Ru. The jet water is rectified from a turbulent flow state to a laminar flow state while passing through the rectifying section 18 having a substantially constant passage cross-sectional area, and is injected from the weft insertion nozzle in a rod-shaped water column having a circular cross section. The diameter of the rectifying section 18 should be set to a diameter that has a cross-sectional area close to the cross section of the orifice within a range where the resistance of the jet water increases and the jet water does not flow back into the weft hole 4. ) desirable for reducing the phenomenon. However, if the diameter of the rectifying section 18 is made smaller, the water will flow back into the weft holes 4.
In order to prevent this, it is desirable to provide a gap 19 between the jet water focusing and rectifying member 14 and the orifice 7. This is considered to be because the jet from the orifice 7 is buffered by the gap 19 rather than directly entering the jet water guiding hole of the jet water rectifying member 14, so that backflow of water can be prevented. Furthermore, the optimal size of the gap 19 to minimize the bump-like (explosion) phenomenon and prevent backflow is determined experimentally, as it varies depending on the usage conditions of the weft insertion nozzle. In addition, during adjustment of the weft insertion nozzle or when usage conditions suddenly change, a backflow phenomenon to the weft hole 4 may occur temporarily. In this case, the backflow water flows through the weft holes 4, reaches the backflow water collecting fitting 20, and is guided to the outside through the handling pipe 21. Therefore, the backflow water will not flow backwards and be ejected from the weft hole entrance, thereby preventing the weft-guiding yarn from reaching the weft insertion nozzle. The shape of the jet water converging and rectifying member 14 may be such that the converging portion 17 has a slight slope or curve to reduce the resistance of the jet water entering the rectifying portion 18 as shown in FIG. It is also possible to reduce the pore diameter almost linearly so that the jet water is focused and rectified at the same time. Furthermore, by making the shape and dimensions of the focusing section 17 and the diameter of the rectifying section 18 relatively large, it is possible to achieve almost the same effect even if the gap is made smaller or eliminated. [Effect of the invention 1] As explained above, according to the present invention, a jet water converging and rectifying member is provided which focuses and rectifies the jet water jetted in an annular shape from the orifice after the confluence point of the weft and the jet water. Therefore, the jet water is ejected from the weft inserting nozzle in the form of a rod-like water column with a circular cross section. Therefore, it is possible to solve the problem that the jetted water spreads due to the occurrence of a lump-like (explosion) phenomenon, resulting in a decrease in the weft tensile force of the jetted water, or that the water temperature of the warp and other side devices is caused by the diffusion of the jetted water. You can get the effect that you can.

[Brief explanation of the drawing]

1A and 1B are longitudinal sectional views of the first and second embodiments of the nozzle of the present invention, and FIGS. 2 and 3 are longitudinal sectional views showing other embodiments of the jet water focusing and rectifying member. The plan view and FIG. 4 are longitudinal cross-sectional views of a conventional nozzle. i)1...
...Nozzle body, 4...Weft hole, 5...
Needle 7... Orifice, 14... Jet water focusing and rectifying section, 17... Focusing section, 18... Rectifying section, 19...
...Gap, Y...Increase in weft patent applicants
1) Teruo Patent Attorney Katsu Ohno
Rei Ohno, same person, Noyanagi Nosuke, same person

Claims (4)

[Claims] (1) In the weft insertion nozzle of the water jet loom, which performs weft insertion by surrounding the weft with jet water, the jet water jetted in an annular shape from an orifice is focused and rectified after the confluence of the weft and jet water. A weft insertion nozzle for a water jet loom, characterized by being provided with a jet water focusing and rectifying member. (2) The weft insertion nozzle for a water jet loom according to claim 1, wherein the jet water focusing and rectifying member is provided with a predetermined gap between it and the orifice. (3) The weft insertion nozzle for a water jet loom according to claim 1, wherein the jet water focusing and rectifying member is provided following the orifice. (4) The weft insertion nozzle for a water jet loom according to claim 1, wherein the jet water focusing and rectifying member is movable in the axial direction of the weft insertion nozzle.