YARN TEXTURING JET

Abstract: A self-stringing yarn texturing air jet which is compact and easy to string up includes a body (10) having a yarn inlet end (13), a movable venturi (14), a yarn guiding element (12) through which yarn passes to the outlet end of the jet, and a second flange 21(a) on the yarn guiding element located upstream of a first flange (21) with an orifice (22), which improves texturing efficiency of the jet.

Description: This invention relates to air texturing of yarn and more particularly, to improvements in a fluid jet apparatus used to texture the yarn. A yarn texturing jet is known from US 4041583 and GB 2098244 having a body having yarn inlet and outlet ends connected by a central bore; means for introducing pressurized gas through a gas inlet into said bore between said ends; a venturi located in said bore near said outlet end; and a yarn guiding element fitted into said bore at the yarn inlet end of the body, said element having a passage therethrough for guiding yarn from the yarn inlet end of the body past the gas inlet through the exit end of said element to the venturi, said element having a first cylindrical flange thereon having a diameter approximating the diameter of said bore, said first flange being located in the bore downstream from said gas inlet, there being an orifice in said first flange in communication with said gas inlet for directing pressurized gas from said gas inlet into said venturi. It has now been found that improved yarn texturing efficiency can be obtained by adding a second flange on the yarn guiding element upstream of the flange with the orifice and downstream of the gas inlet. Thus, according to the invention there is provided a yarn texturing jet including a body having yarn inlet and outlet ends connected by a central bore; means for introducing pressurized gas through a gas inlet into said bore between said ends; a venturi located in said bore near said outlet end; and a yarn guiding element fitted into said bore at the yarn inlet end of the body, said element having a passage therethrough for guiding yarn from the yarn inlet end of the body past the gas inlet through the exit end of said element to the venturi, said element having a first cylindrical flange thereon having a diameter approximating the diameter of said bore, said first flange being located in the bore downstream from said gas inlet, there being an orifice in said first flange in communication with said gas inlet for directing pressurized gas from said gas inlet into said venturi, and characterised in that said element has a second cylindrical flange thereon at a distance upstream from the first flange and downstream of said gas inlet. In a preferred embodiment the second flange has the same diameter as the first flange and is located within the plenum of the jet body; in an alternative embodiment the second flange has a diameter less than the first flange and in both embodiments the second flange serves to reduce the turbulence of the gas behind the first flange which in turn provides a more uniform flow of gas through the orifice in the first flange. Certain embodiments of the invention will now be described in detail by way of example only and with reference to the accompanying drawings in which: Fig. 1 is a perspective view of a preferred embodiment of the invention. Fig. 2 is an enlarged section view of Fig. 1 taken along line 2-2. Fig. 3 is an enlarged section view similar to Fig. 2 of an alternative embodiment of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIGS. 1 and 2 the major elements of the jet device are body 10, cylindrical yarn guiding element 12, movable venturi 14 with its attached collar 16 and baffle 18 with its supporting bracket 20 attached to body 10. Yarn guiding element 12 is press fitted into the bore 9 of the body 10 at the inlet end of the jet body and consists of an entrance 13 in communication with the yarn exit orifice 15 of the yarn guiding element. The outer portion of the yarn guiding element comprises a cylindrical portion 17 with a conical tip 19. Orifice 22 located in a first flange 21 formed on yarn guiding element 12 has its axis parallel to the axis of yarn guiding element 12 and is supplied with gas such as compressed air through fluid connection 23. The flange 21 has a diameter approximating the diameter of the bore 9. Coacting with orifice 22 is a plenum 27 which is circumferentially bored in the side walls of body 10 forming an enlargement of the bore at a location in communication with fluid connection 23. From FIG. 2 it will be noted that incoming air can rush into plenum chamber 27 and immediately pass toward venturi 14 through orifice 22. A second cylindrical flange 21 a is formed on the yarn guiding element 12 a distance d upstream from the first flange 21 within the bore 9 of the jet body downstream of the gas inlet 23. The second flange 21 a has a diameter that is less than the diameter of the first flange and preferably extends about one-half the distance beyond the yarn guiding element 12 as does the first flange. Venturi 14 is free to move axially within the body 10 and a seal is formed between the venturi and body by 0-ring seal 24 seated in an annulus 25 in the body. The venturi 14 is press fitted into collar 16 and collar 16 is free to move within the recess 26 at the outlet end of the jet body. A circumferential groove 28 is formed in collar 16. A rod 30 extends through body 10 and engages groove 28. The rod is rotatable in both the body and the groove. A handle 32 is attached to the end of the rod so that the rod may be easily rotated. The rod is not completely circular but has a cam surface 31 intermediate its ends which is coincident with the groove 28. First and second stops 34, 36 respectively on the surface 11 of the body 10 restrict the movement of handle 32 and consequently the movement of venturi 14. The first stop 34 is a set screw extending above surface 11 of body 10 and the second stop 36 is a disc 37 eccentrically mounted to the surface 11 by a screw 39 which may be tightened to lock the disc in place. The embodiment shown in FIG. 3 is like that shown in FIGS. 1 and 2 except that the second flange 21 a' is a distance d' upstream of the first flange and is now moved to a location within the plenum 27 and not within the bore 9. In this embodiment the flange 21 a' is the same diameter as the flange 21. The operation of this device is as follows: when a yarn or yarns are to be strung up, rod 30 is turned by handle 32 to a position shown in FIG. 1. (i.e., handle 32 is against stop 34) so that movable venturi 14 is moved toward conical tip 19 thus restricting the flow of air until ambient air is aspirated through yarn inlet 13 into and through movable venturi 14. The operator then inserts yarn into the inlet 13 where the aspirated air assists in carrying the yarn through the venturi to the outlet end. The operator then rotates rod 30 to the position shown in phantom in FIG. 1. (i.e., handle 32 is against disc 37) so that the movable venturi 14 is allowed to move away from conical tip 19 under the force of the air pressure within the jet until it reaches the optimum operating setting established by the orientation of disc 37. In a series of test runs using the jet of this invention it was found that increased texturing speed and longer jet operating periods between cleaning cycles were obtained.

Claims: A yarn texturing jet including a body having yarn inlet (13) and outlet ends connected by a central bore (9); means for introducing pressurized gas through a gas inlet (23) into said bore (9) between said ends; a venturi (14) located in said bore (9) near said outlet end; and a yarn guiding element (12) fitted into said bore (9) at the yarn inlet end of the body, said element (12) having a passage therethrough for guiding yarn from the yarn inlet end of the body past the gas inlet (23) through the exit end (15) of said element to the venturi (14), said element (12) having a first cylindrical flange (21) thereon having a diameter approximating the diameter of said bore (9), said first flange (21) being located in the bore (9) downstream from said gas inlet (23), there being an orifice (22) in said first flange in communication with said gas inlet (23) for directing pressurized gas from said gas inlet into said venturi (14), characterised in that said element (12) has a second cylindrical flange (21a) thereon at a distance upstream from the first flange (21) and downstream of said gas inlet (23). A yarn texturing jet as claimed in claim 1 wherein said second flange (21a) is located within said bore (9) and the diameter of said second flange (21a) is smaller than the diameter of said first flange (21). A yarn texturing jet as claimed in claim 2 wherein said second flange (21a) extends about one-half the distance beyond the yarn guiding element (12) as does the first flange (21). A yarn texturing jet as claimed in claim 1 further comprising a plenum (27) located between the ends of said body through which said pressurised gas is introduced into said bore, said second cylindrical flange (21a) being located on said yarn guiding element (12) within said plenum (27) and having a diameter which is equal to the diameter of said first flange (21). A yarn texturing jet including a body having yarn inlet (13) and outlet ends connected by a central bore; means for introducing pressurized gas through a gas inlet (23) into said bore through a plenum (27) located between said ends; a venturi (14) located in said bore near said outlet end; and a yarn guiding element (12) fitted into said bore at the yarn inlet end of the body, said element (12) having a passage therethrough for guiding yarn from the yarn inlet end of the body past the gas inlet (23) through the exit end (15) of said element to the venturi (14), said element (12) having a first cylindrical flange (21) thereon having a diameter approximating the diameter of said bore, said first flange (21) being located in the bore downstream from said gas inlet (23), there being an orifice (22) in said first flange (21) in communication with said gas inlet (23) for directing pressurized gas from said gas inlet (23) into said venturi (14), characterised in that said element (12) has a second cylindrical flange (21a) thereon at a distance upstream from the first flange (21) within said plenum (27), said second flange (21a) having a diameter equal to the first flange (21).

Inventors: CULLEN, ROBERT EMMET, JR.
Applicants: E.I. DU PONT DE NEMOURS AND COMPANY
Application year: 1985
Main classification: D02G1
IPC codes: D02G1, D02J1