Textiles: cloth finishing – Expanding device for textile webs – Web-condition-responsive operation control
Patent
1998-09-14
2000-03-21
Vanatta, Amy
Textiles: cloth finishing
Expanding device for textile webs
Web-condition-responsive operation control
26 91, D06C 302
Patent
active
060387505
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The invention relates to a stenter for a textile material web with two chain conveyors pivotably mounted at the end of the feeding section of the machine, said chain conveyors being pivotable against each other around vertical axles in a scissors-like manner for endless chains reversed in the material web inlet and in the material web outlet, such chains having gripping means for seizing the edges of the material web, whereby provision is made for controlling and driving means for adapting the given spacing of the pivotable ends or wings of the chain conveyors facing away from the axles at the inlet of the feeding section to the measured width of the material web being fed; and whereby the pivotable ends of the chain conveyors are movably supported on a horizontal support by means of carrier wheels.
The feeding section of a stenter of said type, which in practical life is also referred to as a stenter frame, is described in DE 34 17 030 C2. The drawing of DE 22 37 014 B2 clearly shows how a pivotable end of a chain conveyor has to be movably supported on a horizontal support with the help of a carrier wheel.
Provision is made for setting devices, so that the chain guide rails can be adapted to the given width of the textile material web and in order to be able to shift said chain guide rails to the left or right depending on which irregular course the edge of the material web is following. In many cases, such setting devices have to absorb higher forces if the web has to be pulled between the pivotable ends--which can be described also as wings--of the chain conveyor to assume a preset outlet width, starting from the actual inlet width. Furthermore, the mutual spacing of the wings has to be adapted to the width of the instantaneously incoming part of the material web with as little play as possible. Costly toothed-rack drives or chain drives are employed for said reason for setting the wings (DE-AS 18 07 389).
The transverse forces which the wing drives have to control, which in each case is the tension of the web transversely to the direction of transport, are dependent upon which type of material web has to be treated. Material webs with only minor transverse stability, for example knitwear-type materials, are guided through the stenter frame or stentering field with low transverse forces. Higher forces are required if the material has to be pulled to expand it from an actual inlet width to a preset outlet width.
Some companies in the textile industry continually process material webs with very low transverse stability on stenter frames, for example knitwear-type or elastic woven materials. Material webs of this type may be or have to be guided through the stenter frame with low transverse force. Low transverse forces often barely suffice for spreading the respective web in one plane. On the other hand, the known drives designed for relatively high transverse tension, for example according to the above-cited document DE-AS 18 07 389, may actually be replaced by less powerful drives if only lower transverse forces need to be raised. In practical life, however, identical drives are employed in most cases for the transverse setting of the wings irrespective of which transverse forces have to be applied to the material web to be processed in the operation. Simplified stockkeeping and striving for series production may play a role in this connection. However, of decisive importance is the fact that even if the wings have to transmit only low tranverse forces, they have to be exactly and without play adaptable to the given width of the instantaneously incoming material web, or to the course taken by the edges of the material web.
The invention is based on the problem of creating a transverse guiding system for the pivotable ends or wings of the chain conveyors that permits the single-needle or clamping means (gripping means for seizing the edges of the material web) to exactly and practically without delay follow the more or less random course of the edge of the incoming material web without requi
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A. Monforts Textilmaschinen GmbH & Co.
Vanatta Amy
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