GB2060723A

GB2060723A - Winding of yarns from open- end spinners onto common former

Info

Publication number: GB2060723A
Application number: GB8028951A
Authority: GB
Original assignee: Individual
Current assignee: Individual
Priority date: 1979-10-03
Filing date: 1980-09-08
Publication date: 1981-05-07
Also published as: DE3029707A1; ATA645079A; FR2466525B3; FR2466525A1; IT1133503B; IT8015231V0; AT362268B; CS219923B2; BE885326A; DD152950A5; JPS5653213A; IT8012660A0

Abstract

A spinning plant comprises a plurality of spinning stations and a winding mechanism. Each spinning station 1 comprises two substantially parallel, closely juxtaposed suction drums 13, which rotate in the same sense and have suction zones defining a generally triangular space between the drums, a drawframe 11 for delivering a drawn roving to said triangular space at one end of the drums, a pair of withdrawing rollers 12 for withdrawing a spun yarn from said triangular space at the other end of said drums, and means 18 for supplying covering fibers to said triangular space in a direction which is transverse to the longitudinal direction of the drums. In order to eliminate the need for winding and unwinding the spun yarns on and from bobbins before the spun yarns are used to prepare a warp, the yarns are combined in a sheet, which is wound in the winding mechanism on a common carrier 4, which consists of a warping drum, a section warp beam or a loom beam. The comer or the thread guides are reciprocated. <IMAGE>

Description

SPECIFICATION Spinning plant This invention relates to a spinning plant comprising a plurality of spinning stations and a winding mechanism for winding up the spun yarns, wherein each spinning station comprises two substantially parallel, closely juxtaposed suction drums, which rotate in the same sense and have respective suction zones defining a generally triangular space between said drums, a drawframe for delivering a drawn roving to said triangular space at one end of said drums, a pair of withdrawing rollers for withdrawing a spun yarn from said triangular space at the other end of said drums, and means for supplying covering fibers to said triangular space in a direction which is transverse to the longitudinal direction of the drums.

In such spinning plants, the drawn roving is held against rotation in the drawframe which precedes the suction drums and is rotated by the two suction drums in the triangular space between the drums. As a result, the drawn roving is twisted between the drawframe and the suction drums and the resulting twist is fixed against untwisting in the false twisting sense by the covering fibers, which are supplied transversely to the longitudinal direction of the suction drums to the triangular space between said drums. These covering fibers are preferably supplied to said triangular space in the form of-a stream of drawn fibers.Unless the drawn roving is covered by the covering fibers, the fact that the yarn is held against rotation by the withdrawing rollers which succeed the suction drums would cause the roving to be untwisted in the opposite sense between the suction drums and the withdrawing rollers.

Because the drawn roving is sheathed by the covering fibers, the yarn being formed can be twisted at high speed as it is sucked into the wedge-shaped tapering nip between the suction drums and is frictionally contacted by both suction drums. As a result, the resulting yarn can be withdrawn at high speed. Besides, the resulting yarn is highly uniform because the covering fibers can be supplied in the forum of a stream of drawn fibers to the roving, which constitutes the core of the yarn. The resulting yarns are then wound on bobbins. As a separate bobbin is provided for each yarn, an expensive winding mechanism is required for a plurality of spinning stations.Because the bobbins should have a predetermined size but the withdrawing speed is much higher than in other spinning machines, the spinning time after which the bobbins must be replaced is reduced so that the production capacity of such spinning plant cannot be fully utilized. Besides, the bobbins of the winding mechanism usually serve only as intermediate carriers for the yarn, which is to be processed in looms and for this reason must be beamed for use as a warp.

For this reason it is an object of the invention to provide a spinning plant of the kind described first hereinbefore with an improved winding mechanism so that the totai structural expenditure of the spinning plant is reduced, its productive capacity can be utilized to a higher degree and the yarns can be wound up in a manner which is desirable with a view to their further processing in weaving machines.

This object is accomplished in accordance with the invention in that the yarns from a plurality of spinning stations are combined in a sheet, which is wound on a common carrier, which consists, e.g., of a warping drum, a section warp beam or a loom beam. Because the yarns from a plurality of spinning stations are combined in a sheet, which is wound on a warping drum, section warp beam or loom beam, it is no longer necessary to wind each yarn on a bobbin, which serves as an intermediate carrier, and to combine these bobbins in a creel which precedes the beaming apparatus. As a result, the structural expenditure is greatly reduced as well as the space requirement, which is of great importance in industry. Besides, the spinning operation can be continued for a longer time without interruption so that the productive capacity of the spinning plant can be utilized to a higher degree.

If the yarns are to be wound directly on a warping drum, section warp beam or loom beam, the yarn must be withdrawn at a sufficiently high speed. This requirement is met by the spinning plant of the kind described first hereinbefore because the speeds at which the yarns are withdrawn therein are of the same order as the winding speeds in usual beaming apparatus. A further advantage resides in that the yarn can be taken in a substantially tensionless state from the withdrawing rollers of each spinning station.

For the plant in accordance with the invention it makes no difference whether individual warp sheets are wound up with a pitch which corresponds to the pitch of the reed, as in normal warping, or whether they are wound with a smaller pitch, as in section warping, because it is merely essential that the spinning plant is directly succeeded by the means for preparing the warp, whereas the warp may be prepared in any desired manner.

An embodiment of the invention is shown by way of example on the accompanying drawing, in which Figure 1 is a simplified top plan view showing a spinning plant according to the invention, Figure 2 is an enlarged diagrammatic view showing the plant in a side elevation, partly in section, and Figure 3 is a side elevation showing a spinning station.

The spinning plant shown in Figure 1 comprises a plurality of spinning stations 1 and a winding mechanism 2, which comprises a common cylindrical carrier 4 for the yarns 3 from a plurality of spinning stations 1. That cylindrical carrier 4 may consist of a warping drum, a section warp beam or a loom beam. To permit the yarns 3 to be jointly wound on the carrier 4, the yarns 3 are combined by means of a warping comb 5 in a sheet 6, which is guided by a guider roller 7 and a deflecting roller 8 to the carrier 4. The pitch of the comb 5 is selected in dependence on the desired thread pitch. To permit the yarns 3 to be wound in the form of a sheet, the carrier 4 is rotatably mounted in a carriage 9, which is axially reciprocable on a track 10.When it is desired to cross the layers of threads, the warping comb 5 together with the rollers 7 and 8 can be reciprocated parallel to the carrier 4. It will be understood that a crossing of the layers of threads can be effected also by a suitable motion of the carrier 4.

The winding mechanism 2 may consist of a warping machine, a section beaming machine or a full-length beaming machine. This will depend on the manner in which the warp is to be prepared.

This present plant affords the essential advantage that the winding mechanism of the spinning plant is aiso part of the means for preparing the warp so that it is no longer necessary to wind the spun yarns on individual bobbins and to unwind the yarn from the individual bobbins held in creels.

For the preparation of the warp directly after the spinning plant it is essential that the yarns be withdrawn at a sufficiently high speed. Besides, the yams would be taken from the spinning stations 1 with a minimum of tension. These requirements are met by the use of spinning stations which comprise each a drawframe 11 consisting of a plurality of pairs of rollers, a pair of withdrawing rollers 12, and two parallel, closely juxtaposed suction drums 13, which are disposed between the drawframe 11 and the rollers 12 and rotate in the same sense and have each a suction insert 14. These suction inserts 14form confronting suction zones, which define the generally triangular space between the suction drums 13.The roving 1 5 which has been drawn in the drawframe 11 is caused by these suction zones to be sucked into the triangular space so that the roving contacts the peripheries of both suction drums 1 3 and is rotated by the latter.

Another roller drawframe 1 6 is disposed over the suction drums 13 and comprises a pair of delivery rollers 17, which define an outlet over the triangular space defined by the suction drums. By means of the roller drawframe 6, covering fibers in the form of drawn rovings 18 can be supplied to the drawn roving 1 5. The covering fibers which have been parallelized by being drawn cover the roving 1 5 and fix the twist thereof. Because a high twist can be given to the yarn, the spun yarn 3 can be taken from each spinning station 1 at high speed by the pair of withdrawing rollers 12 and can then be fed to the winding mechanism 2.

Claims

1 ..A spinning plant comprising a plurality of spinning stations and a winding mechanism for winding up the spun yarns, wherein each spinning station comprises two substantially parallel, closely juxtaposed suction drums, which rotate in the same sense and have respective suction zones defining a generally triangular space between said drums, a drawframe for delivering a drawn roving to said triangular space at one end of said drums, a pair of withdrawing rollers for withdrawing a spun yarn from said triangular space at the other end of said drums, and means for supplying covering fibers to said triangular space in a direction which is transverse to the longitudinal direction of the drums, characterized in that the yarns from a plurality of spinning stations are combined in a sheet, which is wound on a common carrier, which consists, e.g., of a warping drum, section warp beam or loom beam.

2. Spinning plant constructed and arranged substantially as herein described and as shown in the figures of the accompanying drawing.