Textiles: manufacturing – Textile product fabrication or treatment – Fiber entangling and interlocking
Patent
1997-07-10
1998-10-13
Crowder, C. D.
Textiles: manufacturing
Textile product fabrication or treatment
Fiber entangling and interlocking
198804, D04H 1800
Patent
active
058193839
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND
The present invention relates to a brush conveyor. It also relates to a needling machine equipped with this conveyor.
Needling machines of the prior art are equipped with a system for driving cloths of fibers, provided with an assembly of contiguous brushes. The two functions of these brushes are to drive the fibers and to receive these fibers when the needling takes place. They are generally attached to rails disposed transversely to the direction of drive and driven by drive belts or chains.
In systems of the prior art it is observed that the brushes have a double rocking motion, in the vertical direction and in the horizontal direction, while the needling is in progress and then while the stripping is in progress because of the play between the brushes and the rails and the great distance between the axis of the drive chain or belt and the body of the brush. This double motion induces a marking or line-marking in the textile which is prejudicial to the quality of the final product. The document FR-A-2 217 460 reveals a needling machine comprising an endless band provided with bristles which presses, under a needling assembly, onto a horizontally mobile plate providing a support function. This endless band can consist of separate links articulated with each other and whose function is to support the bristles. This configuration is not adapted to needling machines fitted with a conveyor comprising an assembly of contiguous brushes and does not solve the problem actually encountered of a double rocking motion of brushes during needling and stripping.
SUMMARY BY THE INVENTION
The purpose of the invention is to overcome these disadvantages by proposing a brush conveyor for a velvet needling machine which makes it possible to obtain an isotropic product without line-marking.
This purpose is achieved with a brush conveyor comprising an assembly of contiguous brushes disposed in transverse rows, means of driving this assembly of brushes in order to constitute on the upper face of the conveyor a conveying plane for conveying in a predetermined direction of displacement, each brush comprising a body comprising, on its upper face, holes each of which is provided for receiving a tuft of hair and, on its lower face, means of connecting this brush to the drive means, these drive means comprising several parallel drive belts or chains placed between at least two drive cylinders whose direction of drive is common and this conveyor furthermore comprising means of directly supporting the brush bodies constituting the conveying plane.
According to the invention, the support means comprise a support table comprising several flat support parts separated by spaces provided for receiving the drive belts or chains, and with each transverse row of brushes there is associated a connecting rail extending over the entire width of the conveyor, disposed perpendicular to the direction of displacement and attached to the drive belts or chains.
Thus, the play of the brushes is considerably reduced during needling. Furthermore, reducing the distance between the drive means and the brush bodies contributes to reducing the harmful effects caused by the rocking of these brushes. In a conveyor according to the invention, the brush bodies are held transversely with respect to each other by means of the connecting rails and at the same time are supported vertically by a support table.
According to an advantageous embodiment of the invention, the conveyor furthermore comprises means of holding the brushes constituting the conveying plane against the support table in such a way that the lower faces of the bodies of these brushes are held in constant contact with the support parts, which is not at all the case in systems of the prior art.
The holding means can comprise magnetic attraction means, and the lower faces of the brush bodies and the support table comprise parts made of ferromagnetic material.
It is also possible to make provision for the support table to comprise perforations and for the holding means to comprise means
REFERENCES:
patent: 3890681 (1975-06-01), Fekete et al.
patent: 4651393 (1987-03-01), Dilo et al.
patent: 5117541 (1992-06-01), Leuchtenmuller
patent: 5473802 (1995-12-01), Dilo
Jean Robert
Jourde Bernard
Laune Jean-Christophe
Asselin
Crowder C. D.
Worrell Jr. Larry D.
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