JP2004285558A - Air jet loom - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air jet loom, wherein a compressed air system is driven at a low pressure and weft is inserted at a high speed. <P>SOLUTION: The weft is sent out from a weft bobbin at a nearly constant speed by a delivery roller set in a thread feeder, advanced in the same thread feeder by compressed air and inserted with an air nozzle. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an air jet loom having a weft insertion speed of 1000 m / min or more and a compressed air delivery system.

In an air jet loom, a weft is inserted into a warp opening, that is, an opening formed by a warp with the help of air jetted from a nozzle.
The performance of a loom is usually determined by the weft insertion speed (weft insertion speed) expressed in meters per hour (m / min). For example, in the case of the applicant of the present application, in a high output air jet loom having a weaving width of 2 meters, the weft is inserted 750 times per minute, and the weft insertion speed is 1500 m / min. To maintain this high performance, the weft insertion system operates with air compressed to more than 5 bar. That is, compressed air is supplied to the air nozzle.
JP-A-3-161550 JP-A-5-222648 European Patent No. 0515306 European Patent No. 0456599

  When weaving using an air jet loom, compressed air is relatively expensive as an operating means for weft insertion. For a given air nozzle configuration, the air consumption, or energy consumption, depends on the pressure of the compressed air used for weft insertion. In order to achieve a high weft insertion speed, the weft yarn must be advanced, i.e. fly, from the main nozzle and the auxiliary nozzle to the warp opening by high speed compressed air, in other words, compressed air under high pressure. In a weaving facility equipped with a loom of this type, a double compression device or an air supply plant with a double compressor is required, leading to high investment costs and high operating costs.

  Accordingly, an object of the present invention is to provide an air jet loom in which a compressed air system operates at a low air pressure even when wefts are inserted at a high weft insertion speed.

  SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an air jet loom having a weft insertion speed of 1000 m / min or more and a compressed air delivery system. The air system for inserting the weft, which has been sent out by compressed air in the yarn feeder after being sent out at a speed of not more than 3, by an air nozzle, has a pressure of 3.5 bar or less. It is supplied to the weft insertion member at a continuous speed, and is inserted into the warp opening at a substantially constant speed.

  Acceleration of the weft from zero to a very high speed, well above the average speed, i.e., the weft insertion speed specified by the weft insertion speed that needs to be renewed repeatedly, always keeps the weft at least at a substantially constant speed. There is no need to send out to the insertion member. In the air jet loom according to the present invention, the weft is introduced into the air transport system or the weft insertion member at a speed substantially corresponding to the speed specified by the weft insertion speed.

  Therefore, the weft insertion speed is initially limited to the maximum speed at which weft can be fed from the displayed weft bobbin. For various yarns, especially staple spun yarns, the delivery speed does not increase as desired without this limitation. This is particularly serious with thin yarns of short twisted short fibers.

  Further improvements in weft insertion speed are achieved by using a dual weaving system with multiple weft insertion systems. In this system, a plurality of wefts are inserted simultaneously. A double weft insertion system in which the weft insertion passage is incorporated in the warp shed forming member is disclosed, for example, in EP 0 515 306 or EP 0 456 599.

  However, the invention also allows the production of compressed air in the operation of an air-jet loom with an economical compressor according to the invention. Equipment costs for the compressor can easily be halved. As long as multiple compressors are provided, the number can be reduced. Costs can be further reduced by configuring a conduit system for the compressed air system with a lower operating pressure.

The present invention is described below with reference to the drawings, which schematically show a weft insertion system for an air jet loom.
A plurality of weft insertion device is arranged on the outer cylindrical surface of the loom rotor 1 is shown schematically only four of which together with the weft Y _1, Y _2, Y ₃ and Y _4, the apparatus The weft is inserted at the same time. Weft yarns Y ₁ , Y ₂ , Y ₃ and Y ₄ are fed from weft bobbins S ₁ , S ₂ , S ₃ and S ₄ at a substantially constant speed by weft supply devices L ₁ , L ₂ , L ₃ and L _4. Then, it is supplied to the supply device 11 at substantially the same constant speed. The device 11 supplies or conveys a weft to a weft insertion device of a loom rotor at an accurate position and at an accurate time.

Delivery of the weft Y _{1, Y} 2, Y ₃ and Y ₄ from weft bobbin _{S 1,} S 2, _{S 3} and _{S 4} are, for example, delivery of the thread supply device _{L 1, L} 2, L ₃ and _{L 4} This is performed by a roller (not shown). The delivery rollers make it possible to maintain the delivery speed very accurately.

Advancement of the weft Y _{1, Y} 2, Y ₃ and Y ₄ is already partially facilitated by compressed air in the yarn supply apparatus _{L 1, L} 2, L ₃ and _{L 4.} The compressed air is represented by a compressed air line 12 _L leading from the compressed air container 12 to the yarn feeders L ₁ , L ₂ , L ₃ and L ₄ . Further, at least one of the controllable valve and the adjustable valve may be a compressed air line 12 _L.
And is operated by the control adjustment unit 13. In the supply device 11, weft yarns Y ₁ ,
Y _2, Y ₃ and Y ₄ is advanced by the compressed air. At least one of the separated control valves and control valve V _1, V ₁₄ has been normally provided in each of the feeder for different weft (only one for the weft yarn Y ₄ are shown) .

In the weft passages for the individual wefts Y ₁ , Y ₂ , Y ₃ and Y ₄ , the weft is advanced and inserted into a warp opening provided with a so-called relay nozzle 14 (only the weft insertion passage for the weft Y ₄ is shown). Has been). The supply of compressed air Z ₁₄₁ , Z ₁₄₂ , Z ₁₄₃ , Z ₁₄₄ from the compressed air container 12 to the groups ₁₄₁ , ₁₄₂ , ₁₄₃ , ₁₄₄ of the relay nozzles 14 according to a predetermined weft insertion program with the aid of the control and regulation unit 13. , it is controlled and adjusted by the control valve _{V '141, V' 142,} V '143, V' 144 and control valve _{V 141, V 142, V 143} , V 144.

Control valves V in the compressed air supply line _{'141, V' 142, V} '143, V' 144 and that the order of the control valve _{V 141, V 142, V 143} , V 144 can be reversed is self-evident. Similarly, the pressure of the compressed air supplied from the compressed air compressor (not shown) to the compressed air container 12 can be adjusted. The control and regulation unit 13 can also be operated mechanically or pneumatically. Thus, the valve need not be electrically and electronically drivable.

Because the weft always moves at a constant speed until it stops and is cut, it has a much lower pressure than the prior art device with a fast weft entry speed of 1000 meters or more according to the prior art. It is possible to operate the air supply device.

Conventional devices operate at pressures above 4 bar, typically between 4 and 6 bar, in which case the compressor supplies these devices with compressed air, for example at a pressure of 8 bar.
New delivery devices with a continuous and almost constant weft delivery speed are available at pneumatic pressures of at most 3.5 bar, typically 3 bar, 2.5 bar, 2 bar or only 1 bar or less. Actuating, the pressure between these valves depends on the type and construction of the weft yarn. Weft insertion speeds of 1000 meters and above can be achieved with a single weft insertion device, for example, weft insertion speeds of 5000-6000 meters or more can be achieved with four weft insertion devices, such a double weft insertion device. In the device, four wefts are always inserted simultaneously.

Here, the double weft insertion device of the present invention is described. However, it may be used in a single weft insertion device in which only a single weft is inserted into the warp opening at a time.
1000 m / min or more air jet loom having a weft insertion speed, even 3.5 bar at most pressure, preferably comprises a compressed air delivery device 12, 12 _L or less 2.5 bar.
The compressed air from the compressed air delivery devices 12 and 12 _L is supplied to the air nozzle 14 and the yarn transport members L ₁ , L ₂ , L ₃ and L ₄ (partially not labeled), and the weft yarn Y ₁ , Y ₂ , Y ₃ and Y ₄ are supplied to the weft insertion member and are continuously and almost constantly inserted into the warp opening.

FIG. 1 is an explanatory view showing an air jet loom in the present invention.

Explanation of reference numerals

Weft yarns Y ₁ , Y ₂ , Y ₃ and Y ₄ , weft bobbins S ₁ , S ₂ , S ₃ and S ₄ , weft supply device L
_{1, L} 2, L ₃ and _L 4.

Claims (10)

In an air jet loom having a weft insertion speed of 1000 m / min or more and a compressed air delivery system, the yarn is fed from a weft bobbin at a substantially constant speed by a feed roller disposed in the yarn feeder, and then the yarn feeder is also turned on. The air system for inserting the weft advanced by compressed air in it and further by an air nozzle has a pressure of 3.5 bar or less, and the weft is supplied to the weft insertion member at a continuous speed And an air jet loom that is inserted into the warp shedding at a substantially constant speed. The air jet loom according to claim 1, wherein the air system has a pressure of 2 bar or less. 3. The air jet loom according to claim 1, which is implemented as a double-type loom into which one or more wefts are inserted at the same time, and wherein each of the wefts to be introduced at the same time has a separately separated weft insertion passage. The air jet loom according to claim 3, wherein the weft insertion speed is 4000 m / or more. The air jet loom according to claim 4, wherein the weft insertion speed is 5000 m / or more. The air jet loom according to any one of claims 3 to 5, wherein the plurality of weft insertion passages are uniformly arranged in the axial direction on the outer surface of the outer cylinder of the rotor on the surface of the roller-shaped rotor. The air jet loom according to any one of claims 3 to 6, wherein the weft insertion passage is incorporated in the warp opening forming member. The air jet according to any one of claims 1 to 7, wherein air nozzles for inserting the weft are arranged at a certain distance from each other over the width of the weft insertion passage and connected to the compressed air system. Type loom. A compressed air supply system for a weaving machine comprising an air jet loom according to any one of claims 1 to 8, delivering compressed air at a pressure from 1 bar up to a maximum of 3 bar. A weaving machine comprising the air jet loom according to any one of claims 1 to 8 and a compressed air supply system according to claim 9.

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