Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – Presses or press platen structures – per se
Patent
1998-03-30
1999-09-07
Sells, James
Adhesive bonding and miscellaneous chemical manufacture
Surface bonding means and/or assembly means therefor
Presses or press platen structures, per se
156 733, 156515, D06H 722, B26D 708
Patent
active
059482087
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention is directed to an ultrasonic device for cutting a meltable or fusible textile web and simultaneously welding or heat-sealing the cut edges.
BACKGROUND OF THE INVENTION
A number of ultrasonic devices of the type mentioned above are known, for example, from WO 94/18373, EP-A-0 534 300 and DE-A-35 24 400. All of these ultrasonic devices have in common that they cannot be adjusted to changing thicknesses of the textile webs to be cut and therefore offer results ranging from poor to unusable, especially when cutting label ribbons from a run or web of woven fabric.
EP-A-0 532 865 attempts to overcome the above-mentioned deficiencies in that a precompressor is arranged in front of the cutting knife, this precompressor working together with the ultrasonic transmitter in order that thicker portions of the textile web to be cut are thinned out prior to cutting. However, the precompressor has proven difficult to adjust, so that the precompression is either insufficient or the precompressor already severs the textile web.
SUMMARY OF THE INVENTION
The object of the invention is to develop an ultrasonic device of the type mentioned at the start such that it is possible for textile webs of varying thickness to be cut with ease.
According to the invention, an ultrasonic device can be optimally adjusted to the textile web to be severed in that the cutting knife varies in cross section along the length of the cutter, wherein, in each case, only that cross section which is suitable for a determined thickness of the textile web is used. In this connection, an adjustment of the kind mentioned above can be a basic setting to a textile web to be cut if this textile web has a constant thickness along its entire length. But it is substantially more advantageous to use the ultrasonic device in a textile web having a constantly changing thickness as a result of different patterning, such as is the case in label ribbons in particular. In this case, the ultrasonic device can be directly adjusted to the thickness of the portion of the textile web to be cut. Such an adjustment can be carried out either by means of a feeler which is arranged in advance of the cutting knife or directly on the basis of the control program for producing the textile web, which control program is actually responsible for the patterning of the textile web to be produced.
Therefore, by means of the new ultrasonic device, textile webs can be cut flawlessly regardless of whether they have very thin or thick portions. The resulting cut edges are resistant to rippling and free from brows or discoloration. In spite of favorable strength, they are highly flexible and have a soft texture that is not irritating to skin. However, the ultrasonic device not only provides good characteristics for the textile web to be cut, but also simultaneously improves its own durability, especially with respect to the cutting knife and anvil. Accordingly, the efficiency of the ultrasonic device overall is also improved and the cost-performance ratio is also improved overall.
The ultrasonic device is suitable for the cutting and heat-sealing of a wide variety of textile webs, including knitted layers, knits and wovens. This results in advantages even when the textile web has a uniform thickness over its entire length because the ultrasonic device can be adjusted in a simple manner to any textile web thickness to be produced. However, as was already mentioned, the ultrasonic device proves especially advantageous in the production of textile webs having a constantly changing patterning, and thus changing thickness, along the length. This is the case, in particular, when a plurality of label ribbons are initially woven so as to adjoin one another in a broad woven fabric and the broad woven fabric must then be cut into individual label ribbons. In this connection, the ultrasonic device can be used independent from the device producing the textile web. However, it is more advantageous if the ultrasonic device is arranged directly at the devices ser
REFERENCES:
patent: 3555945 (1971-01-01), Warthen
patent: 4400227 (1983-08-01), Riemersma
patent: 4404052 (1983-09-01), Persson et al.
patent: 5317943 (1994-06-01), Dowdle
Patent Abstracts of Japan, vol. 018, No. 174, (E-1530), Mar. 24, 1994 & JP A 05 343 833 (Fujitsu Ltd), Dec. 24, 1993.
Kueffner Friedrich
Sells James
Textilma AG
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