Apparatus on a textile machine for cleaning fibre material, for example of cotton, having a high-speed first or main roller

Abstract

An apparatus on a textile machine for cleaning fibre material has a first roller for conveying a fibre web, and second and third rollers which have respective nips with one another and with the first roller on rotation of the three rollers. The second roller is arranged downstream of third roller and so co-operates with the first roller that fibre is opened and detached, the fibre is transferred to the nip with the third roller and is conveyed by the third roller to the nip with the first roller, where it is transferred back to the first roller. To improve the degree of cleaning upstream of the second roller and third there is arranged at least one fixed carding element in which the teeth of the clothing are inclined opposite to the direction of rotation of the first roller.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagrammatic side view of a flat card having an apparatus according to a first embodiment of the invention;

FIG. 2 is a side view of a portion of the flat card according to FIG. 1 in detail, the middle licker-in being associated with the apparatus according to the invention, which in the embodiment shown comprises a fixed carding element and two cleaning rollers;

FIG. 3 is a diagrammatic view of the two cleaning rollers of the apparatus of FIG. 2 showing the path of movement of the fibre material;

FIG. 4 a, 4b are a side view (4a) and a front view in section (4b) of the clothing of the second roller (inverter) of the apparatus of FIG. 2;

FIG. 5 shows the clothings of the fixed carding element and of the opposed roller, which clothings are located opposite one another in the carding position; and

FIG. 6 is a side view of a further embodiment in which the first roller is a carding cylinder, which is associated with a worker and inverter pair having a separating device.

Claims

1. An apparatus on a textile machine for cleaning fibre material, wherein the apparatus comprises: a first rotating roller arranged to convey a travelling fibre web;a second rotating roller co-operating with the first roller to form a first nip;a third roller co-operating with the second roller to form a second nip and with the first roller to form a third nip, the second roller being downstream of the third roller;a drive arrangement arranged to rotate at least one of the second and third rollers in the opposite direction to the direction of rotation of the first roller, such that fibre material is opened and detached by the second roller at the first nip, the detached fibre material is conveyed by the second roller to the second nip, and is conveyed by the third roller to the third nip, where it is transferred back to the first roller; andat least one fixed carding element located upstream of a roller pair comprising said second and third rollers and opposed to said first roller, having clothing with clothing tips which are inclined in a direction opposite to the direction of rotation of the first roller.

2. An apparatus according to claim 1, in which the direction of rotation of the second roller is the same as the direction of rotation of the first roller.

3. An apparatus according to claim 1, in which the first roller is a carding cylinder and the second roller is a working roller, and the direction of the second roller is opposed to the direction of rotation of the first roller and the same as the direction of rotation of the third roller.

4. An apparatus according to claim 1, wherein the first roller, the second roller and the third roller have a clothing on their cylindrical outer surface, the needles of which are inclined in the direction of rotation in which on transition of the fibres from the second roller to the third roller the needles or teeth of the rollers are inclined in the same direction.

5. An apparatus according to claim 1, in which the diameter of the second roller is about from 50 to 140 mm, and the diameter of the third roller is about from 60 to 90 mm.

6. An apparatus according to claim 1, in which the second roller has a rotational speed of about from 0.5 to 2 rev/min and the third roller has a rotational speed of about from 5 to 15 rev/min.

7. An apparatus according to claim 1, in which the circumferential speed of the third roller is higher than the speed of the second roller but lower than the speed of the first roller.

8. An apparatus according to claim 1, in which a separation opening having a width of about from 40 to 50 mm is arranged downstream—seen in the direction of rotation of the first roller—of the second roller, the separation opening having a separating edge.

9. An apparatus according to claim 8, in which the separating opening is associated with a suction device for removal of material separated by the separation opening.

10. An apparatus according to claim 11, in which the point density of the clothing on the second roller is not more than 140 ppsi.

11. An apparatus according to claim 1, in which the front angle of the clothing tips of the second roller is about from 40 to 50°.

12. An apparatus according to claim 1, in which the overall height of the clothing is about from 4 to 5 mm.

13. An apparatus according to claim 1, in which at least some of the clothings are all-steel clothings.

14. An apparatus according to claim 1, in which at least some of the clothings are flexible clothings.

15. An apparatus according to claim 1, in which said fixed carding element is directly adjacent to the third roller without any further working element therebetween.

16. An apparatus according to claim 1, in which the first roller is the or a licker-in of a flat card or roller card.

17. An apparatus according to claim 1, in which the first roller is a carding cylinder of a flat card or roller card.

18. An apparatus according to claim 1, in which the first, second and third rollers have clothing having clothing tips which are inclined at an acute angle in the direction of rotation and, in the region of transfer of fibres from the first roller to the second roller the clothing tips of the first and second rollers are inclined in different directions; the speed of rotation of the second roller is lower than the speed of rotation of the first roller; the first roller is a carding cylinder; and the second roller is a worker roller which is rotated in a direction which is opposite to that of the first roller and the same as that of the third roller.

19. An apparatus on a flat card, roller card or the like for cleaning fibre material, for example of cotton, comprising a high-speed first or main roller, which is adapted to support or convey a travelling fibre web, associated second and third rollers, which have respective nips with one another and with the first roller on rotation of the three rollers, and drive means for rotation of the rollers, which drive means are so arranged that the second roller is rotated in a direction of rotation that is the same as that of the first roller and opposite to that of the third roller, wherein the second roller is arranged downstream of the third roller and co-operates with the first roller so that a fibre mat is opened and detached, the fibre mat is transferred to the nip with the third roller and is conveyed by the third roller to the nip with the first roller, where it is transferred back to the first roller, the first or main roller being associated with fixing carding elements, wherein upstream of a pair consisting of a second roller and a third roller—seen in the direction of rotation of the first or main roller—there is arranged at least one fixed carding element in which the teeth of the clothing are inclined opposite to the direction of rotation of the first or main roller.

20. An apparatus on a flat card, roller card or the like for cleaning fibre material, for example cotton, comprising a high-speed cylinder which is adapted to support or convey a travelling fibre web, associated second and third rollers, which have respective nips with one another and with the cylinder on rotation of the rollers, and drive means for rotation of the rollers, wherein the second roller is arranged downstream of the third roller and so co-operates with the cylinder that a fibre mat is opened and detached, the fibre mat is transferred to the nip with the third roller and is conveyed by the third roller to the nip with the cylinder, where it is transferred back to the cylinder, the rollers having a clothing with needles or teeth which are inclined at an acute angle (front angle) in the direction of rotation, and in the region of the transition of the fibres from the cylinder to the second roller the needles or teeth of the rollers in question being inclined in different directions and the speed of the second roller being low in comparison with the speed of the cylinder, in which the second roller is a worker roller and is rotated in a direction of rotation which is opposite to that of the cylinder and the same as that of the third roller.

21. An apparatus according to claim 20, in which the front angle of the teeth of the worker roller is about from 10 to 50° and the clothing gaps are large to obtain higher filling volume for fibres.