Apparatus on a flat card or roller card for textile fibres, such as cotton, synthetic fibres or the like, for removing short fibres

Abstract

An apparatus on a carding machine has a covering comprising work and cover elements lying opposite the clothing of a high-speed cylinder. There is, in succession, an air exhaust opening for the exit of air and an opening for entry of air, past which openings a flow of fibres and air is passed. To allow improved detachment and elimination of short fibres in a simple manner, the spacing of the covering upstream of the exhaust opening is smaller than the spacing of the covering between air exhaust opening and air inlet opening and an airflow flows against the direction of rotation of the cylinder along the surface of the cylinder and flows with short fibres through the air exhaust opening.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

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

FIG. 2 is a side view of one embodiment of the apparatus of the invention, having, in succession viewed in the direction of rotation of the cylinder, a carding segment, a suction hood with exhaust air opening, a supply air opening and a cover element,

FIG. 2 a shows in detail the carding elements of the embodiment of FIG. 2,

FIG. 3 a is a side view of a second embodiment of the apparatus according to the invention with nozzle-like supply air opening and entry of the supply air, passage through the flow channel and the fibre layer and exit of the exhaust air,

FIG. 3 b is a plan view of the apparatus in FIG. 3a,

FIG. 4 is a schematic side view of a third embodiment of the apparatus according to the invention with spacings between the cylinder clothing and covering upstream and downstream of the exhaust air opening as well as flow directions of the supply airflow, the exhaust airflow, the airflow around the cylinder, and of the fibre layer on the cylinder,

FIG. 5 is a side view of a fourth embodiment of the invention, and

FIG. 6 is a side view of a part of a carding cylinder at which is provided a sixth embodiment of the invention with three modules for separation of short fibres in the post-carding zone.

Claims

1. An apparatus on a carding machine having a clothed cylinder and a covering arrangement lying opposite the clothing of the cylinder, wherein the covering arrangement comprises one or more work elements and one or more cover elements, and further comprises, arranged in succession in the direction of rotation of the cylinder, an air exhaust opening, and an air inlet opening, wherein the spacing between the covering arrangement and the cylinder upstream of the air exit opening is smaller than the spacing between the covering arrangement and the cylinder at a position between the air exhaust opening and the air inlet opening.

2. An apparatus according to claim 1, in which the arrangement is such that a flow of air is able to flow along the surface of the cylinder in a direction opposite to the direction of rotation of the cylinder and to detach fibres from the fibres transported on the cylinder, the air flow exiting through the air exhaust opening.

3. An apparatus according to claim 2, in which the air flow is able to detach short fibres from the fibre material on the cylinder surface and to carry the short fibres through the air exhaust opening.

4. An apparatus according to claim 1, in which the spacing between the covering arrangement and the cylinder between the air exhaust opening and the air inlet opening is so selected that there is formed a flow channel along which the air can be sucked.

5. An apparatus according to claim 4, in which the air is sucked through the clothing of the cylinder.

6. An apparatus according to claim 1, in which the spacing from the cylinder of the covering upstream of the air exhaust opening is from 8/1000″ to 15/1000″ and the spacing from the cylinder of the covering between air exhaust opening and air inlet opening is from 60/1000″ to 100/1000″.

7. An apparatus according to claim 1, in which the covering arrangement includes, upstream of and adjacent to the air exhaust opening, a separating element, the spacing of the separating element from the cylinder surface being adjustable.

8. An apparatus according to claim 1, in which the covering arrangement includes, upstream of the air exhaust opening and/or downstream of the air inlet opening, at least one stationary carding element.

9. An apparatus according to claim 8, comprising at least one stationary carding element arranged closely upstream of the air exhaust opening.

10. An apparatus according to claim 1, in which the covering arrangement includes, downstream of the air exhaust opening, a separating element, the spacing of the separating element from the cylinder being adjustable.

11. An apparatus according to claim 1, in which the covering upstream and downstream respectively of the air exhaust opening comprises a guide surface, the spacing of the guide surface from the cylinder surface is adjustable.

12. An apparatus according to claim 11, in which a suction device is associated with the air exhaust opening and/or a blowing arrangement is associated with the air inlet opening.

13. An apparatus according to claim 1, in which the inside width of the air inlet opening and the strength of the exhaust airflow of a suction device associated with the air exhaust opening are co-ordinated with one another.

14. An apparatus according to claim 1, in which the dimensions and configuration of the air exhaust opening and the strength of the exhaust airflow of a suction device associated with that opening are co-ordinated with one another.

15. An apparatus according to claim 1, in which the arrangement is so configured that the internal width of the flow channel between air inlet opening and air exhaust opening and the strength of the exhaust airflow of a suction device associated with the air exhaust opening can be substantially matched with one another.

16. An apparatus according to claim 1, further comprising a suction device in communication with the air exhaust opening, in which the suction device has suction applied to it from two sides at a suction pressure of 1000 Pa or greater per suction.

17. An apparatus according to claim 1, in which a deflector that diverts the supply airflow at an acute angle onto the fibre layer on the cylinder is associated with the air inlet opening.

18. An apparatus according to claim 1, in which the apparatus is in the form of a modular arrangement.

19. An apparatus according to claim 18, in which, in the case of a modular arrangement of the work and/or cover elements, the apparatus comprises two modules.

20. An apparatus on a flat card or roller card for textile fibres such as cotton, synthetic fibres or the like, in which a covering comprising work and cover elements lies opposite the clothing of a high-speed cylinder, in which, viewed in the direction of rotation of the cylinder, in succession there is an opening for the exit of air (exhaust airflow) and an opening for entry of air (supply airflow), past which openings a flow of fibres and air is passed, wherein, in relation to the cylinder, the spacing of the covering upstream of the exhaust air opening and the spacing of the covering downstream of the exhaust air opening are different, wherein in relation to the cylinder the spacing of the covering upstream of the exhaust opening is smaller than the spacing of the covering between exhaust air opening and supply air opening and an air flow that detaches short fibres from the flow of fibres flows along the surface of the cylinder against the direction of rotation of the cylinder and flows away with the short fibres through the exhaust air opening.