Textiles: cloth finishing – Expanding device for textile webs – Spreader
Patent
1997-03-11
1998-08-11
Vanatta, Amy B.
Textiles: cloth finishing
Expanding device for textile webs
Spreader
26 89, 26 72, D06C 304
Patent
active
057910316
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an apparatus for producing longitudinally and/or transversely drawn-out film webs, in particular film webs simultaneously drawn out along two axes.
In the case of such apparatuses, it is known that nippers by which the edge of the film web to be drawn can be gripped, thereby advanced and drawn are made to travel along a rail arrangement. Longitudinal and transverse drawing installations and also biaxial drawing installations for simultaneously drawing film webs along two axes are known. In particular in the case of simultaneously biaxial drawing installations, as a rule the nippers or clamping means are connected to one another by links which are guided in zigzagged arrangement along two guide tracks in the stretching and fixing zone. The two guide tracks are laid in the longitudinal direction in the stretching zone with increasingly less distance between them and in the fixing zone with increasingly greater distance between them. As a result, the spacing between two nippers or nipper carriages changes, whereby the simultaneous biaxial drawing can be accomplished.
A nipper known from the prior art, which can be made to travel along a rail arrangement, is disclosed, for example, by DE 39 28 454 A1.
The apparatus comprises a rail of rectangular cross section transversely to its longitudinal direction. The nipper is equipped with upper and lower vertical running rollers and with horizontal running rollers which lie to the left and right of the rail and are offset in the longitudinal direction, by means of which rollers the nipper can be made to travel along on the rail, along the four running surfaces.
The nipper is made up of the nipper carriage, comprising the running rollers, and the associated clamping means for gripping and securing the edge of a film web to be drawn, for which purpose there is provided on the nipper carriage at approximately the height of the guide rail a nipper table on which, running in the plane of the film web, the edge of the film web is gripped and is tensioned and secured by a nipper lever, not shown in any more detail in the prior publication.
Although this is not represented in any more detail in DE 39 28 454, there may also be provided a shielding wall, which runs along the rail arrangement and shields the free region underneath the nipper carriage to underneath the nipper table.
Nippers which have nipper carriages and corresponding clamping means and are comparable in principle to this extent are also disclosed, for example, by DE 28 41 510 B1 or DE 20 58 575 A1.
The object of the present invention is to provide an apparatus for longitudinally and/or transversely drawing film webs or for simultaneously drawing film webs along two axes which is improved in comparison with the prior art, in particular is less susceptible to problems if the film tears, and in which the film web to be drawn is better protected against soiling.
It is known that the running carriages, the running rollers and the guide oils or greases. It has now been found that residues of such oils and lubricants are thrown in the direction of the film web, at least with particles and droplets of small size, thereby reducing the quality of the film web.
Conversely, however, it is also known that, when producing and drawing such film webs, it is always possible for a tearing of the film web to occur. Film remains and shreds are then accelerated in the direction of the nipper carriages by the drawing forces introduced into the film web via the nipper and may get onto the rail and consequently onto the running tracks themselves. In other words, the film remains in the nipper carriage may get caught up in the running rollers provided there, as a result of which, in the worst case, it is even necessary to stop the installation.
These disadvantages can be overcome according to the invention with comparatively simple means.
For this purpose, the nipper has a new design, which is distinguished in that the actual clamping means holding the edge of the film web are connected to the nipper carriage,
REFERENCES:
patent: 3469291 (1969-09-01), Gageur
patent: 3500515 (1970-03-01), Cunningham et al.
patent: 3580451 (1971-05-01), Fraitzl
patent: 3748704 (1973-07-01), Schmidt et al.
patent: 4435884 (1984-03-01), Bosch
patent: 5081750 (1992-01-01), Molz
patent: 5613284 (1997-03-01), Hosmer
Bruckner Maschinenbau GmbH
Vanatta Amy B.
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