GB2045813A - Method and devices for removal of single yarn in plural rove ring spinning - Google Patents

Abstract

The method comprises feeding the rovings whilst in transit between drafting rollers (1) and a lappet guide (2) and below a natural convergence point of the rovings, through a gap between component parts (10) of a stationary wedging device (W) which serves to retain and break the yarn when, as a result of spinning failure of one of the rovings, the feed path diverges to one side or another of its normal path through the gap between said component parts. Particular wedging devices, may be the coils of a spring or a converging gap between flat components. <IMAGE>

Description

SPECIFICATION Method and devices for removal of single yarn in plural rove ring spinning This invention relates to the production of yamby spinning together two separately supplied rovings by means of a ring spinning frame.

Because rovings are more loosely constituted than yarn it may happen that, for instance due to inadequate oil application or due to the effect of static electricity; one of several separately supplied rovings converging towards the ring spinning frame may migrate and wrap around guides and rollers or otherwise fail to be twisted into yarn. The usual result is that the residual roving or rovings continue to feed as a faulty yarn onto the take-up spindle of the spinning frame.

By the time the fault, for example a singles yarn, is detected by the operator, or by the time the residual yarn also breaks, a quite considerable length of unwanted singles yarn will usually have been pm-- duced.

It is the object of the present invention to provide for the breakage of the spinning yarn in the event of failure of one of two rovings to be twisted into-the yarn.

Thus in accordance with the present invention a method for preventing the production of defective yarn in the event of breakage or failure to spin of one of a pair of constituent rovings comprises feeding the rovings, whilst in transit between drafting rollers and a lappet guide, and below a natrual convergence point of the rovings, through a gap between component parts of a stationary wedging device which serves to retain and breakthe yarn when as-a result of breakage of one of the rovings the feed path diverges to one side of another of its normal path through the gap between said component parts.The wedging device may comprise a pair of spaced coil springs, the axes of the springs being parallel and transverse to the normal path of feed of the yarn between the springs whereby any divergence of the yarn to one side or another of this normal path causes the yarn to become wedged between adjacent coils of one or another of the springs.

Alternatively the wedging device may comprise two pairs of elements mounted so as to define together an acute angled wedging space whereby any divergence of the yarn to one side or another of its normal path through a gap between the said pairs causes the yarn to be wedged between the elements of one or other of the pairs. The angle between the elements comprising each pair is preferably adjustable.

The method and three embodiments of apparatus for performing the method are described hereafter in greater detail by reference to the accompanying drawings, in which: Figures 1 and 2 are respectively side and end elevations of an embodiment utilising a coil spring wedging device: Figures 3,4 and 5 are respectively side, end and part plan views of another embodiment utilising a different wedging device; and Figures 6, 7and 8 are views corresponding to those of Figures 3, 4 and 5 of a modification of the apparatus therein shown.

Referring now firstly to Figure 1 thereis shown a ring spinning apparatus having front drafting rollers 1 from which two rovings converge and pass downwardly in the direction of the arrow D between the elements of a wedging device W, through a lappet guide 2 supported by a base plate 3, through a balloon ring 4 and traveller 5 mounted on a rail 6 so as to be spun and wound onto a package 7 which is carried on a spindle.

The wedging device W comprises a pair of parallel horizontal bars 8 projecting from a right angle bracket 9 bolted to the base 3. Each bar 8 has lugs between which there is stretched a coil spring 10.

The coil spring is adjusted so that the gaps between the coils are such as to permit entrance of the yarn.

Ideally the springs 10 are adjusted so that the yarn cannot pass laterally further than the axis of the spring before the diameter of the yarn.exceeds the distance between adjacent coils of the spring.

As can be seen, the wedging device with its springs is situated fairly close to the lappet guide 2.

In a preferred arrangement the two rovings emerge from the front rollers 1 approximately 12 mm apart and converge approximately 30 mm below the front drafting rollers whereupon they pass through the gap between the springs 10. This normal path is designated P in Figure 2. If for any reason however only one of the rovings required in the yarn is spinning then the single yarn adopts one or other of the yarn paths designated P1 or P2 and in so doing passes between the coils of one or other of the springs 10 which because of their helical formation form a wedge configuration in which the yarn becomes trapped.

In Figures 3 to 5 inclusive, components corresponding to components illustrated in Figures 1 and 2 bear corresponding reference numerals. In this embodiment, a wedging device. mounted below the point of convergence of rovings issuing from the drafting rollers 1 and just above the lappet guide 2 comprises a horizontal bar 11 supported by a cranked bracket 12fixed just above a downwardly hingeable lappet guide support 13.

Attached by means of bolts 14 to the horizontal bar 11 is a pair of oppositely directed plates 15 (Figure 5) with a gap between their free ends and which from their point of attachment diverge at an acute angle -away from the bar 11 to provide therewith a pair of yarn wedging spaces. The angles of divergence of the plates 15 from the bar 11 are adjustable by menas of screws 16 engaged through the bar 11.

Under normal spinning conditions the two rovings emerge from the rollers 1 approximately 14 mm apart and are twisted together. The action of twisting the two rovings causes them to converge approximately 30 mm below the front bottom roller 1 from which point the yarn travels in a straight vertical plane when viewed in end elevation of the apparatus (Figure 4), that is to say along the path P. If for any reason however only one of the rovings required in the yarn is spinning then, as already mentioned the single yarn adopts one or other of the yarn paths P1 or P2 and in so doing passes away from the gap between the plates 15 and into one or other of the wedging spaces defined between one or other of the plates 15 and the bar 11 where it is trapped and retained.Each of the paths P1 and P2 is equivalent to a divergence of approximately 7 mm laterally from both the natural convergence point and the centre of the lappet guide 2. The bar 11 may be 37 mm wide and 14 mm deep; the plates 15 may be 16 mm wide and 14 mm deep and the gap between them is 1 mm wide.

The embodiment of apparatus shown in Figures 6, 7 and 8 somewhat resembles that of Figures 3,4 and 5 except that the assembly comprised of the bar 11, fixing screws 14, plates 15 and adjusting screws 16 is positioned between two lappet guides 21,31 which are adjustably mounted in blocks 17, 18 respectively and retained in adjusted positions by means of locking screws 19. The upper lappet guide 31 is however laterally elongated, as shown in Figures 7 and 8, compared with the lower lappet guide 21. In all respects however the mode of operation of this apparatus is the same as that of the arrangement shown in Figures 3,4 and 5.

Claims (8)

1. A method for preventing the production of defective yarn by a ring spinning frame in the event of breakage or failure to spin of one of a pair of constituent rovings, which comprises feeding the rovings whilst in transit between drafting rollers and a lappet guide, and below a natrual convergence point of the rovings, through a gap between component parts of a stationary wedging device which serves to retain and break the yarn when, as a result of spinning failure of one of the rovings, the feed path diverges to one side or another of its normal path through the gap between said component parts.

2. A method as claimed in Claim 1 wherein the wedging device comprises a pair of spaced coil springs, the axes of the springs being parallel and transverse to the normal path of feed of the yarn between the springs whereby any divergence of the yarn to one side of another of this normal path causes the yarn to become wedged between adjacent coils of one or other of the springs.

3. A method as claimed in Claim 1 wherein the wedging device comprises two pairs of elements mounted so that each pair of elements defines an acute angled wedging space whereby any divergence of the yarn to one side or anothr of its normal path through a gap between the said pairs causes the yarn to be wedged between the elements of one or other of the pairs.

4. A ring spinning frame for performing the method of Claim 1 or Claim 2 including a wedging device disposed adjacent a lappet guide in the path of feed of yarn from drafting rollers, said wedging device comprising a pair of spaced coil springs of which the axes are parallel and transverse to the normal path of feed oftheyarn between the springs whereby any divergence of the yarn to one side or another of this normal feed path causes the yarn to become wedged between adjacent coils of one or other of the coil springs.

5. A ring spinning frame for performing the method of Claim 1 or Claim 2 including a wedging device disposed adjacent a lappet guide in the path of feed of yarn from drafting rollers, said wedging device comprising two pairs of elements mounted so that each pair of elements defines an acute angled wedging space whereby any divergence oftheyarn to one side or another of its normal path through a gap between the said pairs causes the yarn to be wedged between the elements of one or other of the pairs.

6. A ring spinning frame for performing the method of Claim 1 or Claim 2 including a wedging device disposed between an upper and a lower lappet guide in the path of the feed of yarn through drafting rollers, said wedging device comprising two pairs of elements mounted so that each pair of elements defines an acute angled wedging space, whereby any divergence of the yarn to one side or another of the normal path through a gap between the said pairs causes the yarn to be wedged between the elements of one or other of the pairs, the lappet guide nearest the drafting rollers being horizontally elongated compared with the lappet guide on the other side of the wedging device.

7. A method for preventing the production of defective yarn by a ring spinning frame substantially as hereinbefore described with reference to any of Figures 1 and 2, Figures 3,4 and 5 or Figures 6,7 and 8 of the accompanying drawings.

8. A ring spinning frame including, adjacent a lappet guide in the path of feed of the yarn from drafting rollers, a wedging device substantially as hereinbefore described with reference to and as shown in Figures 1 and 2, Figures 3,4 and 5 or Figures 6,7 and 8 of the accompanying drawings.