AU598302B2 - Device for making a self-twisted thread product - Google Patents

Description

AU-A-7919 4 /8 7 PCT4P P.A~f C ,EOrOBOPOM 0 rlATEHTHOfI KOOrIEPA111H (PCT) (51) Mew iuapojman KJI2cci4HI~amm (11) Homep mewAyHaponxioA iry6imaui: WO 88/10332 u3o6peTeiNE 4: Al (43) AMT mewyaapom~ofi ny6JmKauml: D02G 3/28, DOIH 7/90 29 Uexa6p% 1988 (29.12.88) (21) Homep mevI 1yuapoAHofi Iaumn: PCT/SU87/00075 (81) Yica3aimbie rocy~xapcTma: AU, CH (eBPOneficKsni na- TeHT), DE (eaposeficxmA~ nareHTr), FR (eBponeficxlIM (22) JARTa Memc21ynapoIf Ho~aqii: naTeHT), GB (eaponefiCKufi naTeHT), IT (eBponefi- 19 H1OHR 1987 (19.06,87) CKHA riaTeilT), JP (71) 3axBHuiu. Y3BEKCKOEn~POI43BOJICTBEHHOE Otty6mmo~a~a OB'b)EMIHEHI4E TEk"CTIbHOFO MAHIM1- C orn'wmom o mexyi1apod~om noucKe HOCTPOE-l4S [SU/SU]; TawiceuiT 700100, Yn.

Ill.PYCTaveim, g. 536 (SU) [UZBEKSKOE PROIZ- VODSTVENNOE OBIEDINENIE TEXTILNOGO MASHINOSTROENIA, Tashkent (72) H3o6peTaTejm; CABATEJUII Bia~uiimtp BHrajibe- This document conTais the BIN; Ta~uKeHT 700098, maCCuaB Kapa-KaMbIus, 1/1, amendments mnade uLLkr 26, KB, 74 (SU) [SABATELLI, Vladimir Vitali- Section 49 and correct for evich, Tashkent M11POmUH14 1 4EHKO IOpKifiprnig Bopllcoawi; TaUIKeHT 700135, maCCHB '-lunaw~ap,prnng JL-16, xt. 11, KB,' 36 (SU) [MIROSHNICHENKO, Jury Borisovich, Tashkint (SU)J.

(74) Areiri: TOPrOBO-nIPOMbIWJIEHHA1 flAJIATA CCCP; Mocscaa 103735, yn, IKyibWeaa, g, 5/2 (SU) [THE USSR CHAMBER OF COMMERCE AND INDUSTRY, Moscow Thie: DEVICE FOR MAKIG A SELF-TWISTED THREAD PRODUCT (54) Hanaime H306PeTeilH J: YCTPOIICTBO flR5L OJIY4qEH431 CAMOKPY'lEHorO BOJIOKHH4CToro nPO)r1YKTA (57) Ahstrmct A device for mnaking a self-twisted threfid psoduct comprises vortex chambers and ejector tubf~s Each ejector tube Is adjacent by its lower end-face to the vortex chamber and is provided, at its end which is adjacent to the vortex chamber with radial open- t Ings (11) ensuring the drop of superfluous air pressure produfozd at the moment of introducing the suction ends.

APPARATUS FOR PRODUCING SELF-TWISTED FIBROUS PRODUCT Field The present invention relates to spinning equipment and more particularly it relates to an apparatus for producing self-twisted fibrous product.

Background of the Invention Known in the art is an, apparatus for producing self-twisted fibrous product (SU, A, 475430), comprising a housing accommodating swirl chambers with tangential inlets for compressed air supply, a feed channel connected to a compressed air source, a switching device and a thread-joining device.

Sliver ends coming from the outlet or delivery couple of a drafting system are guided into the swirl chambers, and the supply of compressed air into the chambers is turned on. The jets of compressed air twist the sliver ends, and the end joining device joins the two ends witl ach other, for the ends to intertwine and yield self-twisted yarn.

The most complicated operation in operating the known apparatus is guiding the sliver ends into the swirl chambers. The difficulty arises from the product being guided a sliver end just delivered by the outlet couple of the drafting system, flattened and drawn to transparency) being completely devoid of twist and maintaining its integrity solely owing to adherence of component fibres to one another. The adherence i1 so slight that the end is prone to breakage even under its own weight when it sags over a short length of its path. Hence, it is both difficult and effort-consuming to guide a sliver end into the inlet opening of a swirl chamber and to pull it through the full extent of the chamber.

I2 Known in the art is another apparatus for producing self-twisted fibrous product (SstT As 562595)s wherein the guiding of each end into the swirl chamber is effected witb the aid of an ejector device including a tube with a rectangular passage, having an opening made through its wall Tor supplying compressed a~ir, the opening being inclined with respect to the longitudinal axis of the tube, so that when compressed air is fed into this opening, suction is created in one portion of the tube upstream of the opening, and pressure head is created in another portion of the tubes downstream thereof. An end brought to the inlet of the tube, i.e.

to the inlet of the ejector- passage, is sucked into the passage, whereafter the air pr essure head projects it through the remaining length of the passage, and then into the swirl chafinber.

When this known apparatus is stalted, compressed air is initially supplied into the ejectors, and after a predetermined lag intrj -the swirl chambers. The ends delivered by the drafting system enter the ejectors immnediately upon leaving the outlet couple, and~ jets of compressed, air project them via the tubes of.the ejectors into the swirl chambers. While thus moving, the ends -traverse, the swirl chambers, and their leading extremities exit above the end-joining device. It is at this moment that com'pressed air supply to the swirl, chambers is commelaced, the ends are twisted and become stronger by acquiring tile twist,, so that they can be guided through the end-joining devicei byr hand* Thus, incorporation of the ejectors substantially facilitates the guiding of the ends into the swirl chambers. To avoid the adverse effect of an air pressure buildup upon the speed of the moving end as 'it' passes from the ejector passage into the channel Of the swirl chamber, a certain gap is 7,eft between the ejector and the swirl chamber. However,' this gap should not be exceedingly greats lest the end passing -3from the ejector into the swirl chamber and acted upon by both the air stream and the centrifugal forces of rotation in the swirl chamber might fluff up, senlding individual fibres flying off the gap and thus incurring a loss of the initial product.

Consequently, from this viewpoint the gap should be as small as possible.

On the other hand, however, the size of the gap has been found to influence but minimally the waste- -ejection process, i.e. the process of the moving end releasing under the action of centris,7,ugal forces, shorter fibres, lint and dust particles, far from eliminating this process. Thus, however small the gap may be, short fibres, lint and dust particles would be released from it.

In a very small gap, though, coarser particles of impurities, fibres or lint are able to get stuck or hung, causing waste accumulation nuclei attracting and collecting other particles. The process of release and accumulation of waste is relativel,,- speedy on account of the high velocity (to 200 r/mmn) of the moving end. Thus, blocking of the gap with waste could occur, with further accumulation of waste in the area of transition from the ejector to the swirl chamber.

The waste accumulating in the gap at the edge of the axial inlet of the swirl chamber ~nd in the a~joining area is periodically caught by the extremities of the fibres of the revolving end and carried into the A swirl chamber where it is worked into the structure of the roving or yarn, significantly affecting the rov'ing or yarn quality.

This affected quality of roving becomes particularly manifest in the course of its subsequent processing, causing an increased breakage rate at spinning.

Summary of the Invention It is an object of the present invention to VME.

4 overcome or substantially ameliorate the above disadvantages.

There is disclosed herein an apparatus for producing self-twisted fibrous product, the apparatus comprising; a delivery couple, swirl chambers, and ejector tubes arranged intermediate of the delivery couple and the swirl chambers, each tube having through its wall an opening inclined to a longitudinal axis of the tube to feed an airstream thereinto, wherein each ejector tube has an end portion proximate a respective one of the swirl chambers having radial openings therethrough communicating with atmosphere, the ejector tubes being so mounted that respective bottom end faces thereof closely adjoin the respective swirl chambers.

With the ejector tubes being arranged in close proximity to the swirl Schambers and with the tubes having the radial openings made therethrough, the gap between the ejectors and the respective swirl chambers has been eliminated without affecting the operability of the ejectors, this c operability being maintained owing to an air pressure buildup generally formed in transit from a greater channel into a smaller one being relieved via the radial openings made through the end portions of the tubes.

The elimv)ation of the gap between the ejector tubes and the respective swirl chambers not only prevents the loss of fibres, but also precludes accumulation of waste in front of the swirl chambers, enhancing v the product quality and reducing the rate of its breakage at subsequent processing, S" 2S BRIEF DESCRIPTION OF THE DRAWING A preferred form of the present invention will now be described by way of example with reference to t'e accompanying drawing which schematically depicts a longitudinal sectional view of an apparatus for producing self-twisted fibrous product.

The apparatus comprises a known drafting system with two deliveries from the outlet or delivery couple, and a twisting assembly including two swirl chambers mounted in a bracket. Ejector tubes are arranged Intermediate the drafting system and the respective swirl chambers 2.

Each swirl chamber has an axial channel with a cylindrical greater radius portion intermediate its ends.

The greater radius portion of the channel of each chamber accommodates a tangential air inlec for supplying compressed air into the TMS/20901 chamber from a con:pressed air supply line (not shown). Each ejector tube has its upper portion mounted in a support and has an opening made through its wall, inclined with respect to the longitudinal axis of the ejector tube for feeding into this ejector tube compressed air from a compressed air line made through the support and communicating with the respective opening. The bottom ends of the ejector tubes closely adjoin the swirl chambers, as shown in the appended drawing, with radial openings communicating with ambient atmosphere made through the walls of the end portions of the ejector tubes, facing the respective swirl chambers, Underlying the swirl chambers are thread guides, an end-joining ring and a couple of rollers for delivering the fibrous product (the roving) TMS/20901 r--6- -6yielded by the swirl chambers 2.

The apparatus is operated, as follows.

When the working station being described is started, the delivery couple I of the drafting system issues two ends 16 immediately entering the inlet funnels at the upper ends of the respective ejector tubes 4. At this moment compressed air is supplied into the ejector tubes 4 from the compressed air line 10 through their respective inclined openings 9. Owing to the openings 9 being inclined with respect to the longitudinal axes of the respective ejector tubes 4, compressed air supplied into each tube 4 divides into two paths, so that one part of the air stream revolves and slightly twists the end 16, while the other part advances linearly, axially of the ejector tube 4, projecting the end 16 therethrough. Mile approaching the area of transition from the ejector tube 2 into the respective swirl chamber 2, the helically moving air stream exits through the radial openings 11 into ambient atmosphere, avoiding a prBssure build up in this area, sn tli:t the slightly twisted end 16 easily enters the ch4annel 5 of the swirl chamber 2, traverses it and exits outside the chamber 2. At this moment compressed air supply through the tangential inlets 7 into the greater radius cylindrical portions 6 of the respec 7 tive channels 5 of the chambers 2 is turned on, and the respective ends are given the required twist.' The two twistiad ends are guided through the thread guides 12, the end joining ring 13 and under the weight roller of the delivery couple 14 directing the product (the roving) 15 to a winding unit (not shown).

Thus, with the ejector tubes being mounted close to the swirl chambers and having the radial openings made therethrouph at the ends adjoining the chambers, the conditions for release and accumulation of waste with its successive eventual 'spinning itrto the roving are eliminated, which enhances the quality of the roy-

I

-In--*rrrr~ru~i-~ I t -7ing produced and reduces its breakage rate at subsequent processing.

Industrial Applicability Ani apparatus for producing self-twisted fibrous product is employed in spinning machines on textile mills.

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Claims (2)

1. An apparatus for producing self-twisted fibrous product, the apparatus comprising; a delivery couple, swirl chambers, and ejector tubes arranged interm9diate of the delivery couple and the swirl chambers, each tube having through its wall an opening inclined to a longitudinal axis of the tube to feed an airstream thereinto, wherein each ejector tube has an end portion proximate a respective one of the swirl chambers having radial openings therethrough communicating with atmosphere, the ejector tubes being so mounted that respective bottom end faces thereof closely adjoin the respective swirl chambers,

2. An apparatus for producing self-twisted fibrous product, the apparatus being substantially as hereinbefore described with reference to the accompanying drawings, DATED this SIXTH day of MARCH 1990 t Uzbexkoe Proizvodstvennoe Obiedinenie Textilnogo Mashinostroenia Patent Attorneys for the Applicant SPRUSON FERGUSON t I TMS/20901