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Patent Searching and Data

Document Type and Number:
WIPO Patent Application WO/1981/003349
Kind Code:
An arrangement in flat-fittings (2, 3) in cotton carding machines, for removing dust, husks and neps from the cotton supplied to the carding cylinder fittings (4), and comprising a gap (5) disposed along the whole length of the flat-fittings (2, 3) and made in the middle portion of the surface of these fittings (2, 3) facing towards the cylinder fittings (4) and extending forwards-outwards in the travel direction of a flat slat (1) and in communication with the free air via a dust-catching device. The dust-catching device comprises an extension (6) of the gap (5), said extension (6) being in communication with the free air via a plurality of openings and a filter (10) covering them.

Application Number:
Publication Date:
November 26, 1981
Filing Date:
April 09, 1981
Export Citation:
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International Classes:
A23B7/02; A23B7/022; A23B7/04; B01D33/17; A23B7/06; B01D33/23; B08B15/04; D01G15/76; D01G15/78; (IPC1-7): D01G15/76; B08B15/04
Domestic Patent References:
Foreign References:
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1. Method for cotton carding partly for preventing the spr of dust in carding rooms and partly for cleaning the carde material from waste such as dust, sand, husks and neps, co prising that air mixed with waste, which during the rotati of the carding cylinder is brought along by the fittings ( thereon and given a tangential movement in the direction o rotation, is caught by opposed lips (17), characterized in that the air mixed with waste is led by the lips. (17) .thro slits (5) situated, in the^dirfedtiαn of motion of the flat fittings, behind the lips (17) in the flatsfittings .(.2,3) into spaces (6) in the leading part of the flatsfittings, from which spaces (6) the air is led by openings,covered by filter material (10), to the open air, while the waste is retained in the spaces (6) and is sucked out rearwards therefrom after forward change of direction of the flats web.
2. Device for performing the method defined i claim 1, characterized in that each of the flats fittings (2,3) is provided with a slit (5)extending along the whole length of the fitting (2,3) and departing from the central portion of the surface (14) on said fitting (2,3) facing towards the cylinder fitting (4) , said slit extending forwards outwards as seen in the direction of travel of the flats (1), and opening out into a space (6) extending along the whole length of the flatsfittings (2,3), said space being in communication with the open air via a plurality of openings and a filter <10) covering these openings.
3. Device as claimed in claim 2, characterized in that openings open out in the side surfaces, forward in the direction of travel, of the flats fitting 2,3), and that the filter (10) is glued to said side surface.
4. Device as claimed in claim 3, characterized in that the filter comprises an extremely finemesh net.
5. Device as claimed in claim 3, characterized in that the filter comprises a strip of filted fibres.
6. Device as claimed in claim 3, characterized in that the filter (10) comprises a strip of finepore foamed plastics with open pores,.
7. Device as claimed in claim 2, characterized in that the flats fittings (2,3) are made as two separate parts, of which a forward surface (8) in the rear one (2) in the direction of travel slopes outwards forwards and constitutes a rear definition of the slit (5), while a forward portion (3), in. the direction of travel, is formed as a plate with a knife edge shaped back edge (i7), known per se, and with spacer protuberances (9), projecting outwards from the plate (3) at uniform spacing, and adapted for being glued with a flat surface «against a smooth inner surface (7) of a flats slat (1).
8. Device as claime in claim 7, characterized in that at the spacer protuberances (9), from being formed with a rounded edge (13) adjacent the inlet of the slit (5) become wider towards the forward edge of the fitting (3), to be there terminated by planar surfaces in the same plane as the forward face of the flats slat (1), against which planar surfaces the filter (10) is glued.
9. Device as claimed in claim '8, characterized in that the plate (3) is provided on its side facing towards the inlet of the slit (5) with projecting ridges (12) serving as gui _ ding fi s for the airstream through the slit (5)«.
10. Device as claimed in claim 9, characterized in that the central lines of the ridges (12) situated closest to the spacer protuberances (9) converge in a direction towards the filter (10) while the central lines oflthe remaining ridges (12) (12) are mutually parallel and at right angles to the filter.
11. Device as claimed in claim 10, characterized in that the plate (3) is provided with a longitudinal beveled strip (11) adapted for abutting against a lower back edge of the preceding fiats fitting (2).
An arrangement of fittings.for flats in a carding machine

There has long been a need of rapidly removing dust, husks and neps from the cotton coming to the cylinder teeth of a carding machine, so that these contaminants do not disturb the carding process itself and do not wear the teeth on the cylinder or those on the flats, this need also extending to the prevention of the spread of these contaminants into the carding room.

The present invention relates to an arrangement which will satisfy all these needs. In accordance with the invention, the arrangement has been given the embodiment and characterizing features dis¬ closed in the appended claims.

The invention will now be described in detail while referring to the accompanying drawing on which Figure 1 is a cross-section illustrating a flat in a .carding machine, provided ivith an arrangement in accordance with the inven¬ tion, and Figure 2 illustrates an end portion of the arrangement on the flat, as seen in plan towards the cylin¬ der of said machine. In the continued description, orientation is in res¬ pect of the centre of the carding cylinder, and thus "inward" is radially towards the cylinder, "outward" the converse, "forward" in the direction of travel of the flats -

•• A-flats-fitting 2,3 ,is adapted in such a waythat it can be / attached to a flat for instance by glueing. This fitting: is- in two parts for each flat, the backward par ' 2 being conventionally provided with teeth 16. The forwar 5 face 8 of this part slopes forwards-outwards. The forward part 3 is formed as. a plate with its backward portion having a knife edge 17 at a distance from the forward fac 8 of the part 2, ' thus forming a slot or gap 5 between the At its forward edge the plate 3 is formed with a bevelled portion 11 adapted for abutting against the inward back edge of the part 2 on the preceding flat.

The plate 3 is provided with outwardly directed spac protuberances 9, arranged to be glued by their flat outwa sides onto the inward side 7 of the flat slat 1. The pro-- tuberances 9 flare forwards from their backward edges 13, which are rounded, and have flat forward faces situated i the same plane as h ~ forward side of the flat slat 1. A filter 10 is gluei to the forward faces of the protuberan ces 9 and slat 1. The areas between the protuberances 9 are formed as extensions 6 of the gap 5. The backward por tion of the outward side of the plate 3 is provided with rounded peaks 12, of which the ones situated nearest the protuberances- 9 are arranged to converge towards the fil¬ ter 10. The filter 10 can suitably be an extremely fine mesh net, a strip of fibre felt or a strip of foamed plas¬ tics with open pores.

The 1 arrangement functions in the following way *

Since the cylinder rotates with comparatively large peripheral speed, the teeth of the ' cylinder fittings wil entrain the air situated between them so that it is given a tangential movement forwards-outwards. When " this air :.. meets the front edge 17 of the slot 5, which is travelling in the same direction at a substantially less rate, it . will be forced into the slot 5 where it is caused by the ' peaks 12 to move in a substantially laminar mode and out through the filter 10, leaving behind husks, neps and dust in the extension 6, while air departs through the gap 18 between the fitting 3 and a preceding fitting 2. The por-

tion 11 prevents dust-contaminated air departing through the gap 18 out into the carding room where it could give rise to hygienic problems.

When the flat slat 1 comes to the forward turning point of the slat web, the openings of the gaps 5 are connected to a source of heavy vacuum (riot shown) which sucks the filter 10 clean so that the arrangement is ready to function once again when it comes to the rear turning point of the slat web.