Papermakers and like fabrics

Details Papermakers and like fabrics Papermakers and like fabrics

1991-08-29

1993-06-08

Bui, Thuy M.

Endless belt power transmission systems or components

Friction drive belt

Including particular means connecting opposite ends to form...

474254, F16G 300

Patent

active

052174158

DESCRIPTION:

BRIEF SUMMARY
The invention concerns papermakers and like fabrics, and has more particular reference to corrugator belts.
Traditionally corrugator belts are of substantial thickness, and, in view of such thickness, difficulty has been experienced in bringing such belts into endless form.
In our copending United Kingdom Patent Application No. 8825870.2 we have disclosed a flat-woven papermakers or like industrial fabric comprising plural layers of interwoven warp and weft yarns and binder yarns connecting said plural layers and have proposed a particular form of seam wherein a butt joint is provided which overlies a clipper seam, the purpose being to give an improved paper or like support surface to the fabric in the region of the seam.
The present invention is concerned with the opposite face of the fabric, and is more particularly directed to a reduction in the noise generated by passage of the seam over a support roller and in the marking attributable to seam/roller interaction.
According to the invention there is proposed a low noise papermakers or like industrial fabric having an oblique seam joining the respective free ends thereof, characterised in that the seam lies at an angle in the range 1.degree. to 15.degree. with respect to a line transversely of the fabric and perpendicular to the running direction thereof.
According to a preferred feature, the angle of inclination lies in the range 3.degree. to 8.degree..
The invention will now be described further, by way of example only, with reference to the accompanying diagrammatic drawings illustrating one embodiment thereof, and in which:
FIG. 1 illustrates the connection between the fabric ends of a woven multi-layer structure; and
FIG. 2 is a plan view, partly broken away, of the arrangement shown in FIG. 1.
Referring now to the drawings, and particularly to FIG. 1 thereof, a corrugator belt comprises a multi-layer structure 11 of integral, flat-woven form, in which the respective ends 12, 13 only are shown, the structure being made endless by means of a clipper seam 14 engaged with some only of the layers.
In forming the joint between the fabric ends, the respective ends 12, 13 are cut to complementary stepped form, those cuts at the respective fabric ends 12, 13 which extend parallel to the general plane of the fabric being on a line between two adjacent layers 15, 16, the cut thus severing only yarns which connect the adjacent layers and thereby avoids prejudice to the integrity of the individual layers. The cut at fabric end 12 which is parallel to the general plane of the fabric is extended into the fabric as at 17, the clipper seam 14 being applied between the tongue 18 formed by the extension 17 to such cut and the corresponding part 19 of the opposed fabric end 13.
As is apparent from the drawing, the upper layer 15 of fabric end 12 extends across the clipper seam 14 and overlies layers 16 and 22 at opposing fabric end 13.
In accordance with the present invention, the fabric ends 12, 13 are cut on the bias, at least as regards the extremity of tongue 18 and the corresponding opposing part 19, the clipper seam following the line of such ends. The preferred angle of inclination is 3.degree. with respect to the line of a conventional seam, although other inclinations, say within the range 1.degree. to 15.degree. and preferably between 3.degree. and 8.degree. may be used.
As is shown in FIG. 2, the individual clipper hooks 21 of the clipper seam will be positioned to extend outwardly from the respective fabric ends at right angles thereto, and will thus be inclined at a like angle to the machine direction yarns at the fabric ends, although it is to be understood that such hooks may, if preferred, lie parallel to the machine direction yarns, thus facilitating the interdigitation of the hooks on insertion of the pintle wire 23. Whilst it is envisaged that the hooks will be separate one from another, it may be found convenient to provide a means whereby the same are secured together, such means serving to maintain the hooks in a position at right angles to the l

REFERENCES:
patent: 2733181 (1956-01-01), Riedesel
patent: 3546054 (1970-12-01), Ross
patent: 4279676 (1981-07-01), Morrison et al.

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