JPS6011135B2 - Fluid supply control method in jet room - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention particularly relates to a fluid supply control method in a jet loom, and prevents the occurrence of overflow, spillage, and waste of fluid by appropriately adjusting the state of fluid jet from each nozzle in the event of an accident. It is designed to prevent this.

In the jet loom, during normal operation, the twill yarn is inserted and conveyed into the well by fluid such as air or water that is jetted at high speed from the main nozzle and the auxiliary nozzle.

However, when some kind of accident occurs, the loom stops, but
Due to the inertia of various parts of the machine and the slippage of the brakes, this stoppage usually occurs around the crank angle of 180 degrees, rather than immediately after the accident.

Furthermore, for this purpose, looms are generally equipped with a positioning stop device. By the way, if we take an air jet as an example, the main nozzle and auxiliary nozzle for injection continue the normal jetting state at this crank angle position.

(Depending on the type of yarn, the auxiliary nozzles in the group closer to the main nozzle may stop ejecting at this timing.) Therefore, the yarn is exposed to high-speed airflow for a long time.
Especially in the case of single yarns such as spun yarns, striped yarns may sometimes break. Furthermore, if the fluid supply is kept fully open in this manner, the free-flow condition continues as long as the crank stops at the crank angle position, so the fluid consumption increases rapidly in the thick machine base.

Normally, fluid is supplied to each machine from a common source, so if the fluid consumption of a particular machine suddenly increases like this, the fluid pressure in the adjacent machines will drop, resulting in jetting failure. The adjacent aircraft also stopped. In this way, Kendai's influence spread one after another. In order to prevent the above-mentioned accidents, for example, in the invention of Japanese Patent Publication No. 45-35388, a method has been proposed in which the valve is fully closed in the event of an accident, completely cutting off the supply of fluid.

However, if you use a fully closed system like this, which completely cuts off the fluid emitted from the nozzle when the machine is stopped, the striped threads will not be tensioned and will be in a completely natural state, so they will remain as they are when restarting the machine.
When striped weft threads are threaded, they are threaded in a state where they are looser than other weft yarns, which tends to cause weft slack defects. Therefore, the purpose of the present invention is to avoid the above-mentioned drawbacks of the full-open/full-open type, and also to maintain the weft yarn in a suitably tensioned state during the machine stoppage due to an accident. By constricting the flow paths between the main tank and between the auxiliary nozzle and the sub-tank, each nozzle instantly emits a weak jet flow smaller than during normal operation.

A more detailed explanation will be given below with reference to the drawings.

FIG. 1 schematically shows the fluid supply system. The main nozzle 1 is connected to the main tank 3 and the regulator 5 by a pipe.
It is connected to a fluid supply source (not shown) via. or,
A predetermined number of auxiliary nozzles 7 forming one group are grouped together and connected to the above-mentioned fluid supply source via a sub-tank 9 and a regulator 1 common to all groups. In this invention, between the main nozzle 1 and the main tank 3 and between the auxiliary nozzle 7 and the subtank 9 for each group,
During this period, the flow rate is changed when the platform is stopped, that is, the flow rate is changed from a normal flow rate to a weak flow rate by narrowing the flow path.

The above switching is performed by a switching valve mechanism 15 with a throttle valve 13 as shown in FIG. 2A.

In the state shown in the figure, the flow path is fully open, and the main and auxiliary nozzles 1 and 7 perform normal injection. At the time of camphor stand, the switching valve mechanism is in the state shown in FIG. 2B, the flow path is in a constricted state, and the main and auxiliary nozzles 1 and 7 perform weak injection. Throttle valve 1
The degree of throttling in step 3 is set in accordance with various values such as the specification of the yarn and the pressure of the supplied fluid, so as to give an appropriate tension to the twill yarn in the village mouth when the machine is stopped. According to this invention, since the respective flow rates are switched immediately upstream of the king of the loom and the correction nozzle, appropriate tension is applied to the striped yarn by ejecting the minimum necessary feeble jet without delay when the loom is opened. It stays in the mouth of the cup.

Since it is a weak jet, the threads will not break, and since it has almost no effect on the fluid pressure of adjacent joints, there will be no influence on the camphor stand. The main tank and sub-tank are always kept at the same pressure as the fluid supply source, and the flow rate is switched downstream, so when restarting the operation, the jet is injected at the normal flow rate without delay, and the striped yarn remains taut. Since it is hammered, there are no defects such as sagging in the weft. Of course, waste of fluid and power can also be avoided.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an outline of a fluid supply system according to the present invention, and FIGS. 2A and 2B are explanatory diagrams showing the operation of a switching valve mechanism. 1... Main nozzle, 3... Main tank, 7... Auxiliary nozzle, 9... Sub-tank, 13... Throttle valve, 15... Switching valve mechanism. Mackerel 1 figure *2 prisoners

Claims (1)

[Claims] 1. A jet room characterized by narrowing the flow paths between the main nozzle and the main tank and between the auxiliary nozzle and the sub-tank, thereby switching the fluid jet from the main and auxiliary nozzles to a weak jet that conforms to the weft specifications in the event of an accident and stoppage. Fluid supply control method in.