GB2063318A

GB2063318A - Sliver condenser for open-end spinning machines

Info

Publication number: GB2063318A
Application number: GB7940071A
Authority: GB
Original assignee: TASHKENT SP KONSTRUKT BJURO TE
Current assignee: TASHKENT SP KONSTRUKT BJURO TE
Priority date: 1979-11-20
Filing date: 1979-11-20
Publication date: 1981-06-03
Also published as: DE2946722C2; CH640894A5; DE2946722A1; GB2063318B; FR2470171A1; FR2470171B1

Abstract

A sliver condenser comprises a casing (1) having a passage (2) therein which narrows in the direction of sliver flow. Opposite projections (6) are internally provided to extend over the entire length of the passage at an angle to the longitudinal axis (7) thereof. The projections (6) cross one another. <IMAGE>

Description

SPECIFICATION Sliver condenser for open-end spinning machines The present invention relates to open-end spinning machines, and more specifically, to fibrous sliver condensers to be used in such machines.

The invention consists in a sliver condenser having a casing provided with a passage which narrows in the direction of sliver flow and terminates in a rectangular opening, the passage being internally provided with opposite projections extending at an angle to the longitudinal axis of the passage with each projection extending over the entire length of the passage on either side of its longitudinal axis and with the opposite projections crossing one another.

The provision of the projections extending over the entire length of the passage and intercrossing of the projections results in uniform density of fibre over the entire cross-section of the sliver since one projection displaces surplus fibre toward one edge of the sliver and the other projection which extends in the opposite direction displaces surplus fibre toward the other edge of the sliver.

For a simple manufacture, each projection is made in the form of a step.

To main intact the sliver structure in the middle portion thereof, as well as to avoid breaking of the formed flow of fibre at the sliver outlet from the condenser passage, the projections inside the passage are preferably arranged in such a manner that the distance therebetween on the side of the sliver outlet from the passage is equal to the maximum cross-sectional dimension of the outlet opening of the passage.

To improve the degree of action on thicker portions of sliver in the inlet and working zones, the projections are preferably arranged inside the passage in such a manner that the distance therebetween on the side of the sliver entrance to the passage is from 0.4 to 1.0 of the maximum cross-sectional dimension of the passage. The ratio 0.4 is selected when processing an ordinary sliver in the condenser, that is a sliver having a lenticular cross-sectional shape. In such an application the main mass of fibre is in the centre of the sliver, and the most intense action of the projections eliminating thicker portions which are displaced toward the edges occurs in the central part of the sliver.

The ratio 1.0 is used in applications where the condenser is used for a sliver having enlarged edge portions, that is an intense action of the projections for eliminating thicker portions at the edges and displacing them to the centre occurs at the sliver edges.

The condenser according to the invention is preferably used in a drawing apparatus having a feeder device comprising a sliver clamping line arranged at an angle to the flat side of the sliver In such a case the distance as measured on the side of the inlet opening of the passage between the surfaces provided with the projections is greater than the maximum dimension of the outlet opening of the passage.

In the accompanying drawings: Figure 1 shows a sliver condenser according to the present invention when viewed from the inlet opening of the passage; Figure 2 is a sectional view taken along the line Il-Il of Figure 1; Figure 3 is a sectional view taken along the line Ill-Ill of Figure 1; Figure 4 is a sectional view taken along the line IV-IV of Figure 3; Figure 5 is another embodiment of a sliver condenser according to the present invention; Figure 6 is a sectional view taken along the line VI--VI of Figure 5; Figure 7 is a sectional view taken along the line VIl-VIl of Figure 5; Figure 8 is a transverse section of the condenser; Figure 9 is a sliver condenser according to the present invention used in a drawing apparatus.

The sliver condenser according to the invention shown in Figures 1 to 4, comprises a casing 1 having a passage 2 therein which narrows in the direction of sliver flow and terminates in a rectangular opening 3. The passage 2 is defined by a pair of opposed walls 4 and 5 of which the walls 5 are wider than the walls 4.

The passage 2 is internally provided with opposite projections 6 which are formed on the wider walls 5. The projections extend at an angle "a" to the longitudinal axis 7 of the passage 2 and cross one another, that is they extend in opposite directions as can be seen in Figures 1, 3 and 4.

Such arrangement of the projections enables elimination of fibre bunches to be achieved by drawing fibres apart in the sliver in opposite directions, thereby ensuring uniformity of the sliver over the entire cross-section.

The projections 6 are arranged within the passage 2 in such a manner that the distance 2a therebetween (a is the distance from one projection to the longitudinal axis 7 of the passage) on the side of the entrance of the sliver to the passage 2 is from 0.4 to 1.0 of the maximum cross-sectional dimension of the inlet opening 8 of the passage.

The distance 2a is equal to 0.4 of the maximum dimension in an application where an ordinary sliver, that is a sliver of a lenticular cross-sectional shape, is fed to the sliver condenser, and the distance 2a is equal to 1.0 maximum dimension in an application where a sliver with enlarged edges is fed to the sliver condenser.

Figures 5 and 7 show an embodiment of the sliver condenser in which each of the opposite projections thereof is formed as a step 9. The steps also extend at an angle "a" to the longitudinal axis 7 of the passage 2 (Figure 6) and are arranged within the passage in such a manner that the distance "b" therebetween on the side of the sliver outlet from the passage 2 is equal to the maximum cross-sectional dimension of the outlet opening 3 of the passage.

The sliver condenser functions in the following manner.

A sliver 10 (Figure 8) is inserted into the sliver condenser through the inlet opening 8 of the passage 2, passes along this narrowing passage and leaves in the condensed condition through the rectangular slit-shaped opening 3. When passing through the passage the enlarged portions "c" of the sliver 10 are engaged by the projections 6, 9 and are displaced thereby in opposite directions as shown by arrows "A" in the drawings.

This ensures a uniform distribution of fibre over the entire cross-section of the sliver at the outlet of the sliver condenser, thus contributing to a high degree of separation of the fibre, and hence, improved quality of the resultant yarn.

It is well known that sliver in cans or spools assumes a flat shape under pressure.

On the other hand, known in the art are separating and drawing apparatus having a sliver clamping line 11 in their feed pairs of rolls as shown in Figure 9 which extends at an angle to the flat side of the sliver 10.

In such case the sliver is fed to the rolls at its narrow side and is distributed along the clamp line in the form of a bunch of an arbitrary configuration.

For a better separation of the fibre, and hence for improving the quality of yarn, the flat side of the sliver is preferably oriented along the clamp line. This is achieved by using the sliver condenser according to the invention.

As shown in Figure 9, the sliver 10 is fed to the entrance of the sliver condenser in such a manner that its edges are between the walls having the steps 6, 9 with a dimension "d". When the sliver moves, the steps act more strongly on its edges to turn the sliver in such a manner that its flat part is oriented along the maximum dimension "b" of the outlet opening, that is along the clamp line of the fibre by the feed pair of rolls. In order that the sliver cannot be damaged at the edges due to an abrupt narrowing, the distance "d" between the walls on which the projections are provided is preferably greater than the maximum crosssectional dimension "b" of the outlet opening of the sliver condenser.

Claims

1. A sliver condenser for open-end spinning machines comprising a casing, a passage arranged within said casing and narrowing in the direction of flow of the sliver which extends through said passage, an outlet opening of said passage of rectangular shape and projections extending over the entire length of said passage opposite to one another and at an angle to the longitudinal axis of the passage, said projections crossing one another.

2. A sliver condenser as claimed in claim 1, wherein each projection is formed as a step.

3. A sliver condenser as claimed in claim 1, wherein the projections are arranged inside the passage in such a manner that the distance therebetween on the side of the sliver outlet from the passage is equal to the maximum crosssectional dimension of the outlet opening of the passage.

4. A sliver condenser as claimed in claim 1, wherein the projections are arranged inside the passage in such a manner that the distance therebetween on the side of entrance of the sliver to the passage is equal to from 0.4 to 1.0 of the maximum cross-sectional dimension of the inlet opening of the passage.

5. The use of the sliver condenser as claimed in any of the preceding claims for a drawing apparatus, wherein a sliver clamping line extends at an angle to the flat side of the sliver, wherein the distance as measured on the side of the inlet opening of the passage between the surfaces on which the projections are provided is greater than the maximum dimension of the outlet opening of the passage.

6. A sliver condenser as described with reference to, and as shown in, Figures 1 to 4, or Figures 5 to 8 of the accompanying drawings.