JPH0124152Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multicolor weft inserting device for a fluid jet loom, and more particularly to a device for adjusting the fluid pressure of a nozzle in response to yarns of different fineness.

In multicolor fluid looms, the weft conveying force is limited within the range of the performance of each nozzle. Therefore, when weaving yarns of different fineness, a weft conveying force, that is, a fluid pressure, corresponding to each weft yarn is required.

Conventional conveyance force is generally set for a plurality of weft yarns of different finenesses, with the strongest yarn or yarn having the largest fineness, that is, the weft yarn that requires the most conveyance force, as a reference. For this reason, the conveyance force becomes excessive with respect to other weft yarns, and accidents such as deflection of the yarn tip, loosening of the yarn, and even breakage when the yarn strength is weak occur, making weaving impossible.

By the way, a pressure regulating device that uses both an accumulator and a throttle valve has been proposed. The purpose of this conventional pressure regulating device is to obtain an optimum fluid pressure gradient for conveying the weft yarn, and therefore the source of fluid pressure is a constant pressure. Therefore, the above device cannot be applied to a waterjet loom, that is, a pressure source in which the fluid pressure supply source is constituted by a plunger pump and generates a predetermined pressure waveform in advance.

Therefore, the object of the present invention is to use a fluid with an optimal fluid pressure waveform and pressure gradient to obtain an appropriate pressure for wefting yarns of different fineness without changing its predetermined pressure waveform and its pressure gradient. The purpose is to provide a means to easily change the value.

Based on the above objective, the present invention connects a plurality of horizontal insertion nozzles in a branched state to a source of a predetermined pressure waveform, and interposes an on-off valve in the pipe line from this branched path position to each nozzle. At the same time, a bypass path for external outflow is formed in the pipe line of the nozzle that requires a low pressure among those nozzles, and a throttle valve in this bypass path is used to prevent the pressure waveform of the pressure fluid from the source from changing. This allows the relative value of the pressure to be easily changed.

Hereinafter, the configuration and functions of the present invention will be specifically explained based on the embodiments shown in the drawings.

First, FIG. 1 shows a multicolor weft insertion pressure regulating device 1 for a fluid jet loom. This multicolor weft insertion pressure regulating device 1 has a plurality of, for example, two nozzles 3a and 3b for weft insertion connected to a pressure generation source 2 in a branched state through pipes 4, and each pipe 4 has a solenoid valve as an on-off valve. 11a and 11b, and a bypass path 5 is provided in the conduit 4 of the nozzle 3b for horizontal insertion at a lower pressure among the two nozzles 3a and 3b,
A variable throttle valve 6 is provided in the middle of the bypass path 5. The pressure generation source 2 is, for example, a plunger pump connected to the tank 8, and its spring characteristics generate a fluid 7 for weft insertion with an optimal pressure waveform and an appropriate pressure gradient for weft insertion, When it is placed horizontally, the nozzle 3a,
Supply to 3b. Of course, the timing of the operation of the pressure generating source 2 and the solenoid valves 11a, 11b is synchronized with the timing of weft insertion of the loom. Further, the nozzles 3a and 3b take out weft yarns 9 having different finenesses, and insert them into the weaving machine while jetting the fluid 7. Note that the bypass passage 5 allows the fluid 7 to flow back to the tank 8 .

Next, the operation of the multicolor horizontal insertion pressure regulating device 1 will be explained.

The pressure generating source 2 supplies a fluid 7 having an ideal pressure waveform as shown in FIG. 2 to each nozzle 3a, 3b in synchronization with the wefting operation of the loom. Therefore, the nozzles 3a and 3b are connected to the solenoid valve 11.
Depending on the opening and closing of a and 11b, the respective weft threads 9a and 9b are alternately wefted in accordance with the pattern of the woven fabric structure. One nozzle 3a is
As shown in FIG. 2, the fluid 7 is injected under the pressure waveform of the maximum pressure value Pa to apply a weft thread conveying force to the weft thread 9a. As shown in FIG. 3, the other nozzle 3b performs weft insertion at a lower pressure value Pb while maintaining the same waveform and the same slope. That is, the fluid 7 in the pipe line 4 flows through the throttle valve 6 of the bypass line 5.
As shown in FIG. 3, the pressure on the inlet side of the nozzle 3b is reduced to
This means that the pressure has dropped by the amount corresponding to the amount of leakage. Moreover, since this pressure drop is a parallel shift of the original pressure waveform in a lower direction, the nozzle 3b still injects the filling fluid 7 under the ideal pressure waveform. Become.

Here, the injection period T2 of the nozzle 3b is approximately equal to the injection period T1 of the nozzle 3a. However, if a long injection period T3 is required, an orifice or throttle valve 10 for setting the injection period is provided on the inlet side of the nozzle 3b. This throttle valve 10 is
By restricting the flow rate of the fluid 7, an injection period T3 that is longer than the injection periods T1 and T2 is generated. In this case as well, the pressure gradient of the pressure waveform is
Almost no change.

In addition, in the above embodiment, nozzles 3a and 3b are provided in the pipe line 4.
On-off valves, that is, two solenoid valves 11a, corresponding to each
11b, these opening/closing valves may be an electromagnetic or mechanical type at a branch position of the pipe line 4, and may also be constituted by a multi-port switching valve having a closing function at a neutral position. Further, in the above embodiment, a bypass path for external outflow including a throttle valve is provided in only one of the pipes, but this bypass may be provided in both pipes.

In the present invention, since the fluid with an ideal pressure waveform can be set at a low level without changing the pressure waveform, especially its pressure gradient, it is possible to weave yarns of different fineness under an ideal pressure value.

[Brief explanation of the drawing]

FIG. 1 is a piping diagram of the multicolor horizontal insertion pressure regulating device of the present invention, and FIGS. 2 to 4 are fluid pressure waveform diagrams. 1...Multicolor horizontal insertion pressure regulator, 2...Pressure generation source, 3a, 3b...Nozzle, 4...Pipeline, 5...
Bypass path, 6... Variable throttle valve, 7... Fluid, 8... Tank, 9a, 9b... Weft, 10
... Throttle valve, 11a, 11b... Solenoid valve as an on-off valve.

Claims (1)

[Scope of utility model registration request] A plurality of horizontal insertion nozzles are connected to a predetermined pressure waveform generation source in a branched state by pipes, and an on-off valve is interposed in the pipe from the branch position to each nozzle, and at least one of the pipes is A multicolor weft insertion pressure regulating device for a fluid injection loom, characterized in that a bypass path for external outflow is provided between an on-off valve and a nozzle, and a throttle valve is provided in the bypass path.