US2045338A - Stretching mechanism for stretching textile fibers for mules, ring spinning, and stretching machines - Google Patents

Description

A. AEBERLI 2,045,338

June 23, 1936. STRETGHING MECHANISM FOR STRETCHING TEXTILE FIBERS FOR MULES, RING SPINNING, AND STRETCHING MACHINES Filed Dec 22, 1953 Patented June 23, 1936.

STRETCHING MECHANISM'FOR STRETCH- ING TEXTILE FIBERS FOR MULES, RING SPINNING, AND STRETCHING MACHINES.

Arnold Aeberli, Zurich, Switzerland Application December 22, 1933, Serial No. 703,612 In Switzerland January 2, 1933 6 Claims.

' This invention relates to a stretching mechanism for stretching textile fibers for mules, ring spinning and stretching machines, consisting substantially of two stretching cylinders mounted in side plates connected by a cross piece and a clearer roller, said stretching cylinders being in positive rotary connection with one another by means of a driving element.

In the known stretching mechanisms of this type the cross-sectional reduction of the stretch ing cylinders at the points, at which they join the journals, is entirely without transition. The stretching cylinders extend at both sides very close to the side plates, so that only a narrow gap remains at each side between these plates and the end faces of the stretching cylinders. Moreover, the side plates serving as bearings for the stretching cylinders in the known stretching mechanisms of the type in question are constructed in such a manner that the stretching cylinders laterally cover the side plates almost entirely, that is approximately within the range of the whole end faces. V

It has been found, that the dust and spinning fly penetrate into the narrow gaps between the side plates and the end faces of the stretching cylinders and winds -on the journals, whereby jammings are caused, which may lead to irregularities in the circumferential speed of the stretching cylindersor even to stopping thereof.

-In thestretching mechanism according to the invention these and other objections are overcome in that the stretching cylinders are fitted at both ends with a neck tapering towards the journals and that each of the side plates are so constructed that the lower edge of each side plate intersects the bores for accommodating the stretching cylinder journals so that the bores are open in downward direction, at least one journal of each stretching cylinderrbeing axially shiftable and held in operative position by resilient means. I

An embodiment of the invention is illustrated by way of example in the accompanying drawing, in which:-

Fig. 1 shows in rear elevation the stretching mechanism viewed in the direction of the arrow I of Fig. 3. I

Fig. 2 is a front view of the mechanism.

Fig. 3 is a side elevation of Fig. 1.

Fig. 4 shows the stretching mechanism in cross section taken on the longitudinal central plane II of Fig. 1.

Fig. 5 is a. cross section on line IIII of Fig. 1.

Fig. 6' is a detail.

Fig. 7 shows a stretching cylinder partly in longitudinal section and on a larger scale.

. Fig. 8 is a view of a modified form of stretching cylinder.

In the drawing two side plates I are connected by a transverse piece 2. Stretching cylinders 3 and 4 are journalled in the side plates l, the cylinder 4 having a fluted surface. l3 and i3 designate two rear cylinders and i4, I4 two front cylinders. I5 is the fiber band to be stretched. It enters the stretching mechanism at B and leaves it at C.

The stretching cylinders 3, 4 have necks 5, 6 respectively each'tapering towards the coordinate journal. The side plates are'formed with recesses constituting sockets or bearings it) and it) which open through the lower edges 1 of the side plates and receive the journals 8 and 9 of the cylinders. By having the bearings formed with the restricted mouths at their lower ends as shown in Figure 3, the journals8 and 9 will be prevented from slipping out of the bearings but the bearings can be cleaned without it being plates I or from the bores therein by inwardly pressing this shiftable journal 9.

The bores ID of the stretching cylinder 3 as shown in Figure 3 are elongated transversely of the side plates whereby the cylinder 3 can be shifted in its bearings and maintained in paral- 3 lel relation to the fluted cylinder 20. By this arrangement, the fibers will be guided and maintained under uniform pressure, this being of great important for the production of first class uniform material. Shifting of the cylinder 3 away from the cylinder 4 will also tighten the belt II which imparts rotary motion from one cylinder to the other;

The stretching cylinders 3, 4 have each a portion l2, l2 respectively or" oval cross section for accommodating the driving belt I I. The driving belt II is stretched over the cylinders 3 and 4 so that through the driving of the cylinder 4 the cylinder 3 is also driven. The stretching cylinders rest on a fluted cylinder 20 which drives the likewise fluted stretching cylinder 4. It will be observed that the cylinders 3 and 4 are arranged on opposite sides of a plane passing vertically through the axis of the cylinder 20 and in alinement with said axis. Because of this arrangement, these rollers tend to move downwardly over the surface of the cylinder 20 and thus to separate and stretch the belt II, the bearings for the cylinder 3 being shaped to permit such separation. In the case of very long stretching cylinders 3, 4, two driving belts are preferably employed, which each run on one of the turned portions of oval cross section of its stretching cylinder. A cylinder so formed is illustrated in Fig. 8.

V A clearer roller I6 bearing merely on the fluted stretching cylinder 4 exerts by gravity at the same time also a loading effect :on the driving element I I stretching the same and maintaining the element II under such tensionas to rotate the stretching cylinders under constant driving a nut 20' for adjusting the position of the'device in the machine frame and on the fluted cylinder 20, so as-to lengthen or -.-shorten:.the clamping distance as desired. The stretching mechanism is therefor so mounted that its frame together with the pressure cylinders and the .clearerrOlier will be shiftable backwards and forwards as a complete unit and adapted to be removed from the machine frame like an ordinary upper cylinder.

By the arrangement of the necks gradually tapering towards the journals jamming, owing to the spinning fly, is avoided. "The freeing .of a greatportion of the end faces of the stretching cylinders due to the raised edges I of the side plates I also renders it diificult for the spinning fly to collect. Moreover, asalready'mentioned, cleaning is greatly facilitated at the bearing points open in downward direction, .and as the spinning fly cannot collect, electromagnetic. currents between the rotating parts are avoided.

Owing ,to the axial shiftability .of .aJournal of each stretching cylinder these cylinders can be easily inserted and removed.

The fluting of one stretching cylinder 4 advantageously increases the adhesion between this cylinder and the fluted cylinder 29 and therefore exerts a very favorable effect on the drawing in of the fibre band I5. The adhesion between the stretching cylinder ,4 and the fluted cylinderid is still further increased by the. clearer roller It arranged above the stretching cylinder 4 and pressing by gravity on to the stretching cylinder. It is thus possible, to obtain a preliminary retardation between the pair .of pulling in'cylinders I3, I3 and the stretching cylinder 4 and the fluted cylinder 20, an'd to distort-the sc -called twister in.

Reference has beencma'de to stretchable'belts II of known type. 'Stretchable rubber belts are satisfactory in some climates but where theolimateis suchasto 5 affectrubber injuriously, well known spiral wire belts may be employed-and of course the inventor does not wish to be limited with respect to the type of belt employed.

I claim:-

1. Stretching mechanism for stretching textile fibers for mules, ring spinning and stretching machines, comprising in combination two side plates having recesses formed therein constituting sockets, a transverse frame rigidly connecting said side plates, two stretching cylinders, and a clearer cylinder journaled in said side plates, 2. driving element adapted to rotate said stretching cylinders, journals one on each end of each of said stretching cylinders journalled in the sockets of said side plates and one of said journals being axially shiftable, a tapered neck on each end of each of said stretching cylinders tapering towards its ,coordinatejournal and providing clearance between the cylinders and the inner faces of the side plates, the sockets for accommodating said stretching cylinders having restricted mouths opening through the lower ,edges of the-side plates, and. resilient means adapted to maintain said axially shiftable journal in operative position.

2. A stretching mechanism as specified in claim 1, comprising in combination with the side plates, the stretching cylindersand the driving element, a pressure roller on which rests said stretching cylinders, an endless belt forming said driving element, certain of said sockets being elongated transversely of the side plates, and one of said stretching cylinders being displaceable in the elongatedsockets to change the distance between this cylinder and the other stretching cylinder and accommodate itself to the fibre band, and at the same time .to stretch said belt.

3 A stretching mechanism as specified. in :claim 1, in'which the side plates, the stretching cylinders and the clearer rollerform a complete unit adapted to :be shifted backwards ;.and forwards inand to be insertedand removed-from themachine :frame like an ordinary uppercylinder.

4. :A stretching mechanism as specified inclaim 1, comprising in combination .withitheistretching cylinders, -the.;clear erroller and theside plates, which all together forma complete unit,a-flute,d cylinder under said stretching cylinders, outwardly extending projections gon-said ,side plates, adjusting screws, and adjusting'nuts run each of said projections adapted to. adjustthepositionof said unit. in the macln'ne frame and ,on said; fluted cylinder to varying the clamping .distanceas -.desired.

5. Astretching mechanismasspecified in claim 1,. in which said stretching. cylindershaveeach a turned extensionof oval..cr0ss section and said I driving :elementv comprises. two endless. belts each running on one extension of saidstretching cylinders.

:6. A.-.stretching mechanismaszclaimed. in claim 1, comprising .in combination withuside :plates, clearer roller and .stretchingcylinders, a. driving element in the form of an endless belt, said clearer roller resting partly. on one of =Saidstretching. .cylitHdBIS and partly on the belt to effect stretching said belt, said side plates having cup-likelongitudinal slots, hemispherical :ends on :said clearer roller engaging in such slots, sa-id .slots'ibeing milled to correspond to the radius of thetendsr of said clearer. roller.

ARNOLD AEBERLI.

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