JPH07100899B2 - Weft insertion method for fluid jet loom - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a weft inserting method for a fluid jet loom.

(Prior Art) Conventionally, a plunger pump used for weft insertion of a fluid jet loom has a coil spring arranged around a cylinder case that covers a cylinder of the plunger pump, and the cylinder case uses a coil spring to form a piston. It is pressed against the piston so that it moves in the same way as By the suction stroke of the piston, the fluid flows into the cylinder through the pump valve, and the compression stroke by the spring pressurizes the fluid in the cylinder, supplies it to the weft insertion nozzle through the transfer pipe, and jets it from the weft insertion nozzle. It At this time, weft insertion is performed by causing the weft yarn to fly by the fluid jet. The pressure of the fluid that is pressurized in the compression stroke of the pump is called the pump pressure, and the maximum value of the pump pressure can be easily adjusted by compressing and using a spring. The maximum value of the pump pressure (Pm), the falling pressure of the pump pressure (P1) and the pressure gradient of the pump pressure depending on the pressurization time T: Px = (Pm-Pl) / T is determined by the spring constant of the coil spring used. To be In a conventional fluid jet loom using a plunger pump, in order to change the pressure gradient of the pump pressure, the joint connecting the piston and the cam lever is removed, the pump is disassembled, and then the coil spring is replaced. In the operation (weft insertion) of the fluid jet loom, the pump pressure needs to be changed according to the number of revolutions of the loom, the type of woven fabric, or the type of weft, but it is necessary to disassemble the pump each time, and to change it. Since it requires a large number of springs for it, it was troublesome to obtain the optimum pump pressure for the weft used.

(Object of the Invention) An object of the present invention is to use a special plunger pump capable of easily setting the optimum pump pressure for the number of revolutions of the loom, the woven fabric, or the type of weft when weft-inserting the fluid injection loom. Then, it proposes the weft insertion method of the fluid injection loom which can change operation easily according to a change of working conditions.

(Structure of the Invention) Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 is a sectional view for explaining a plunger pump used in the method of the present invention. In FIG. 1, a piston 1 moves in a direction of compressing a coil spring 4 together with a cylinder case 3 via a joint 2 which is moved by a cam and a cam lever (not shown), and a fluid flows through a suction valve 5 into a cylinder 6 ′. Inhale (inhalation stroke). The compressed coil spring 4 transmits the compression energy to the cylinder case 3, and the cylinder case 3 pushes the piston 1 to pressurize the fluid sucked in the suction stroke (pressurization stroke). The fluid in the pressurized cylinder 6 ′ is supplied to the weft inserting nozzle (not shown) through the fluid transfer pipe 9 via the extrusion valve 8. Since the spring constant of the coil spring 4 determines the characteristics of the fluid required for weft insertion conditions such as the maximum value Pm of the fluid pressurization, the pressurizing operation time T, and the falling pressure P1, it is necessary to adjust the spring constant. There is. In the plunger pump used in the present invention, one end of the coil spring 4 is in contact with the flange of the cylinder case 3, and the other end is connected to the spiral groove 11 formed on the spring wire fixing member 10 having a ring shape. I am fit. The spring wire fixing member 10 is attached by a cap 13 attached to the pump body 12 via a screw. The spiral groove 11 formed in the spring wire fixing member 10 can be replaced with a spiral hole.

Since the method of the present invention uses the plunger pump as described above, the maximum pressure Pm for fluid pressurization, the falling pressure Pl, and the pressurizing operation time T can be set to arbitrary levels. That is, by moving the spring wire fixing member 10, the operable winding number of the spring 4 can be substantially changed. By varying the number of operating turns of the spring 4, the operating length can be changed without compressing the entire spring 4, so that Pm, Pl, and T can be easily adjusted. By making Pm, Pl, and T adjustable, the pressure gradient Px = (Pm-Pl) / T during weft insertion can be planned according to the number of revolutions of the loom, the type of thread used, and the reed width. The jar pump can be adjusted steplessly without disassembling and the weft insertion of the fluid jet loom can be performed.

(Advantages of the Invention) According to the present invention, since the pressure gradient of the plunger pump pressure is adjusted in this manner and the weft insertion of the fluid injection loom is possible, the weft insertion conditions can be set without disassembling the plunger pump. This is possible, and there is no need to have a spare coil spring to accommodate different operating conditions. Further, in the plunger pump used in the present invention, since the working stroke of the spring can be freely changed, it is possible to reduce the pulsation of the pump pressure generated during the motion of the fluid injection loom, and prevent the abnormal diffusion of the injection fluid. Not only improves the operating rate of the fluid jet loom, but also solves the problems of warp due to weft twisting, poor drainage, backhaul, etc. that may occur depending on the type of weft, and the quality of the woven fabric. It can also contribute to improvement.

[Brief description of drawings]

FIG. 1 is a sectional view for explaining a plunger pump used in the present invention. 3 ... Cylinder case 4 ... Coil spring 10 ... Spring wire fixing member

Claims (1)

[Claims] 1. A cylinder case covering a plunger pump for supplying a pressurized fluid to a weft inserting nozzle of a fluid jet loom, a coil spring arranged around the cylinder case, and a spring wire of the coil spring. And a spring wire fixing member having a spiral groove or a hole, and a plunger pump in which the number of operating turns of the coil spring is variable by the spring wire fixing member is used to adjust the pressure gradient of the plunger pump pressure. A weft insertion method for a fluid jet loom, which comprises adjusting the weft insertion.