Apparatus for making yarn packages

专利名称：Apparatus for making yarn packages发明人：WURMLI ARTHUR申请号：US55291655申请日：19551213公开号：US2800762A公开日：19570730

摘要： Apparatus for stretching, twisting and packaging a bundle of continuousfilaments of synthetic linear high polymer material, the packages being free fromunstretched yarn, includes draw rolls for continuously stretching a travelling bundle offilaments immediately prior to their collection, a ring twisting and collecting spindle, anozzle from which a jet of highly compressed gas is discharged at a high speed, andmeans for continuously feeding the filament bundle into the jet prior to the passage ofthe bundle over the draw rolls and prior to the commencement of the collecting andtwisting operation, so that the bundle is subjected by entrainment in the jet to thetension required for the subsequent threading of the bundle over the draw rolls and theinitiation of the collecting and twisting operation. As shown in Fig. 1, when the collectingand twisting operation is in progress a filament bundle 3, supplied from a spool (notshown), passes between the feed rolls 1, 2 and is stretched between the draw rolls 5, 7with their associated guide rolls 4, 6. The filament bundle 3 runs in conventional mannerthrough the eyelet 8 and the traveller 9 carried by a ring 10 to the tube 13 on which thepackage is formed. The ring 10 is guided by a ring carrier 11 and the tube 13 is mountedon a spindle 12 and rotates with the latter. The assembly of elements 8-13 constitutes atwisting device and the elements function in the same manner as the corresponding

elements in a conventional ring spinning frame. The tube 13 rests on a shoulder 14 (Fig. 2)of a cone 15 (Figs. 1 and 2), to which a whorl 16 is secured. The spindle can be brought torest by means of a spring-operated brake 17. The outer portion of a spindle rail 18 (Figs.1 and 3) supports a nozzle assembly 19 into which air at about 6 atmospheres pressure isfed by a conduit 20. The expanded air flows, with its velocity not substantially reduced,through a discharge conduit of length about 20 cm. into a conduit 22 placed alongsidethe machine, a waste collecting container (not shown) being placed at the end of theconduit 22. The spindle brake 17 is mounted immediately below the whorl 16 between acover sheet 28 and the spindle rail 18, brake shoes 29, 30, individually mounted on levers31, 32 respectively (Figs. 4 to 6), being urged against the spindle by means of a spring 33.For releasing the brake a spreading lever 34 revolving a spreading block 34 is provided,the latter having three pairs of parallel surfaces 37-39. The distance between the pairs ofsurfaces 37, 38 is such that it causes sufficient spreading of the levers 31, 32 to release thebrake shoes 29, 30. The distance between the pair of surfaces 39 is smaller and does notcause spreading of the levers 31, 32 and a disengagement of the brake. The cone 15 isprovided at the cut-away portion 27 with two catches 23, 24 (Figs. 2, 2a and 3) forproducing a right or left-hand twist. A cam 36 rigidly connected with the spreading lever34 (Figs. 3 to 6) has a substantially straight cam portion extending through an angle ofrotation of the cam of about 60 degrees. The nozzle assembly 19 includes an inductionnozzle 40 (Figs. 1, 3, 7 and 8), an inlet element 43 (Fig. 7) for the compressed gas and acontrol rod 41 having a cam follower roller 42 supported at its free end. A ball valve 43,45 loaded by the spring 55 is adapted to close the communication between the inletelement 43 and a chamber 44 communicating with the inlet conduit 20 when the cam 36 isin the position shown in Fig. 6, which is the normal operating position. When the cam 36 isin the position shown in Figs. 4 and 5, the control rod 41 is pushed to the left, lifting theball valve 45 from its seating and allowing compressed air to enter a duct 46 in theelement 43, from which duct it passes through radial bores 47 in the element 43 into thebore 48 of the body of the nozzle assembly 19. Thence, the compressed air flows into a

clearance 53 (Fig. 8), between a nozzle member 50 and a widened portion 51 of a bore 52of the induction nozzle 40. The member 50 is provided with a number of nozzle bores 54which are inclined towards the longitudinal axis of the member and in which the flow ofgas from the inlet element 43 causes a suction effect in the passage 52. The twistingoperation is started by applying the brake 29-33 to bring the spindle 12 to rest bymoving the lever 34 into the position shown in Fig. 4. The unstretched filament bundle 3 isthreaded over the feed and drawing rollers 1-7 and through the eyelet 8, the traveller 9,one of the catches 23 or 24 of the cone 15, a slot 57 of a thread guide ring 56 and intothe bore 52 of the induction nozzle 40 of the nozzle assembly 19. The filament bundle isstretched by the suction in the passage 40 and the high velocity of the gas dischargedthrough the exhaust pipe 21, which is connected to the lower end of the member 50, theresulting tension on the filament bundle being about 50 grams. Thereafter the filamentbundle is passed successively through the nip of the feed rollers 1, 2 and the drawing rollassembly 4-7 and the drawing operation thereby initiated. The brake 17 is now set in theintermediate position shown in Fig. 5, in which the brake is released but the nozzleassembly 19 is still effective because the valve 45, 43 is still being held open by the rod41. The filament bundle is then severed between the suction nozzle 40 and the catch 23to start the twisting operation. The filament bundle taken along by the catch 23 becomeswound several times on the tube 13 at the elevation of the traveller 9 at this moment,whereupon the normal twisting and spooling operation begins. The severed end of thefilament bundle is removed through the nozzle assembly 19 and the other end of thebundle, which is hooked in the catch 23, is thrown outwardly by centrifugal force as longas the spindle rotates. This other end of the bundle is therefore free until the package iscompleted and is available for connecting to the upper end of the subsequentlyproduced package. When normal twisting and winding has begun the spreading lever 34is moved into the position shown in Fig. 6, so that the nozzle assembly is made ineffectivealthough the spindle brake 17 remains disengaged. The apparatus ensures that the

filamentary material initially wound on the bobbin is, like the remainder, in the stretchedcondition. Specification 359,627, [Group IX], is referred to.

申请人：JOH. JACOB RIETER & CO., LTD.

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