Device such as a carding machine for processing fibres

• US 20040010890A1
• Filed: 06/06/2003
• Published: 01/22/2004
• Est. Priority Date: 08/28/2000
• Status: Active Grant

• Current Assignee: Hollingsworth GmbH
• Original Assignee: Hollingsworth GmbH
• Inventors: Artzt, Peter, Jehle, Volker, Bocht, Bernhard, Maidel, Hermann
• Granted Patent: US 6,996,878 B2
• Time in Patent Office: Days
• US Class Current: 19/98
• CPC Class Codes: D01G 15/88 formed from metal sheets or strips

Abstract

The present invention relates to a device, such as a carding machine, for processing fibres, said device comprising a cylinder, which is provided with a lining, and at least two carding segments which are arranged one after the other in the direction of rotation at least over an area of the circumference of said cylinder, each of said carding segments being provided with a toothed lining. The present invention aims at improving the efficiency of such a device especially in terms of fibre parallelization. In order to achieve this, the toothed linings of the carding segments are designed differently; when the fibres are engaged by the toothed lining of the carding segment constituting the upstream carding segment in the direction of rotation, the resultant influence on an individual fibre entrained by the circumference of the cylinder will be equal to or more intensive than the influence exerted when the fibres are engaged by the toothed lining of a carding segment constituting a downstream carding segment in the direction of rotation.

Claims

1. A carding machine comprising a cylinder (2) provided with a lining, and at least two carding segments (7, 8, 9, 10) which are arranged one after the other in the direction of rotation (B) at least over an area of the circumference of said cylinder and which are each provided with a toothed lining (12, 13, 14, 15), toothed linings (12, 13, 14, 15) of said carding segments (7, 8, 9, 10) being designed differently, characterized in that the teeth (20) of the toothed linings (12, 13, 14, 15) are provided with a rake angle (a) which, on average at least, is larger in an upstream carding segment (7, 8, 9) than in a downstream carding segment (8, 9, 10) so that, when the fibres are engaged by the toothed lining (12, 13, 14, 15) of the carding segment constituting the upstream carding segment (7, 8, 9) in the direction of rotation (B), the resultant influence on an individual fibre entrained by the circumference of the cylinder (2) will exceed the influence exerted when the fibres are engaged by the toothed lining (13, 14, 15) of a carding segment constituting a downstream carding segment (8, 9, 10) in the direction of rotation (B).

2. A device according to claim 1, characterized in that the teeth (20) of the toothed linings (12, 13, 14, 15) comprise an area (F), which is defined between the outer cutting area contour line comprising the cutting face (21) and an imaginary connecting line (22) intersecting the cylinder axis (A) and the tip (23) of the tooth at right angles and which, on average at least, is larger in an upstream carding segment (7, 8, 9) than in a downstream carding segment (8, 9, 10).

3. A device according to claim 1 or 2, characterized in that the teeth (20) of the toothed linings (12, 13, 14, 15) have a cutting area (25) and a root area (26) and that the width (F_st) of the root area (26) is larger in an upstream carding segment (7, 8, 9) than in a downstream carding segment (8, 9, 10).

4. A device according to one of the claims 1 to 3, characterized in that a tooth spacing (t) of the teeth (20) of the toothed linings (12, 13, 14, 15) is larger in an upstream carding segment (7, 8, 9) than in a downstream carding segment (8, 9, 10).

5. A device according to one of the claims 1 to 4, characterized in that the teeth (20) of the toothed linings (12, 13, 14, 15) have a height (h) which, on average at least, is higher in an upstream carding segment (7, 8, 9) than in a downstream carding segment (8, 9, 10).

6. A device according to one of the claims 1 to 5, characterized in that the cutting areas (25) of the teeth (20) of the toothed linings (12, 13, 14, 15) have a height (h_s) which, on average at least, is higher in an upstream carding segment (7, 8, 9) than in a down-stream carding segment (8, 9, 10).

7. A device according to one of the claims 1 to 6, characterized in that the teeth (20) of the toothed linings (12, 13, 14, 15) of an upstream carding segment (7, 8, 9), or rows of said teeth (20) extending in the direction of rotation (B), are laterally displaced relative to the teeth (20) of the toothed linings (12, 13, 14, 15) of the downstream carding segment (8, 9, 10), or relative to rows of said teeth (20) extending in the direction of rotation (B).

8. A device according to claim 7, characterized in that, when the width (F_st) of a tooth (20) of the toothed lining (12, 13, 14, 15) of an upstream carding segment (7, 8, 9) is divided by the width (F_st) of a tooth (20) of the toothed lining (13, 14, 15) of the respective downstream carding segment (8, 9, 10), the result is not equal to an integer.

9. A device according to one of the claims 1 to 8, characterized in that the teeth (20) of a carding segment (7, 8, 9), which are arranged one after the other in the direction of rotation (B), are arranged such that they are displaced relative to one another.

10. A device according to one of the claims 1 to 9, characterized in that a dirt separation means (17, 18, 19) is arranged between at least some of said carding segments (7, 8, 9, 10).

11. A device according to one of the claims 1 to 10, characterized in that a suction means is provided.

12. A device according to one of the claims 1 to 11, characterized in that in the toothed linings (12, 13, 14, 15) of the carding segments (7, 8, 9, 10) the distance (h) between the shoulder (40), which fills the space between two rows of teeth, and the associated tips (41) of the teeth is smaller than the distance (H) between the shoulder (42) and the associated tips (43) of the cylinder (2) provided with a lining.

13. A carding segment (30) for a device, such as a carding machine, for processing fibres, which is provided with a toothed lining (31), characterized in that the tooth geometry of the toothed lining (31) varies in the processing direction (B), and that, when the fibres are engaged by an area of the toothed lining (31) constituting an upstream area in the processing direction (B), the resultant influence on an individual fibre to be processed will be equal to or more intensive than the influence exerted when the fibres are engaged by an area of the toothed lining (31) constituting a downstream area in the processing direction (B).

14. A method of opening, combing and parallelizing fibres by means of a cylinder (2) provided with a lining and by means of at least two carding segments (7, 8, 9, 10) which are arranged one after the other in the direction of rotation (B) at least over an area of the circumference of said cylinder, each of said carding segments (7, 8, 9, 10) being provided with a toothed lining (12, 13, 14, 15), characterized in that, as the degree of opening of the fibres increases, the tooth geometry of the toothed linings (12, 13, 14, 15) of the carding segments (7, 8, 9, 10) varies in dependence upon the degree of opening of said fibres so that the fibres will be in engagement with the teeth of the toothed linings (12, 13, 14, 15) of the carding segments (7, 8, 9, 10) in a substantially uniform manner over the entire height of the processing areas of said teeth.