Cutting – Processes – With preparatory or simultaneous ancillary treatment of work
Patent
1994-01-28
1995-09-26
Rada, Rinaldi I.
Cutting
Processes
With preparatory or simultaneous ancillary treatment of work
83171, 836511, 219221, 219233, B26D 302, B26D 312, D06H 722
Patent
active
054526337
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a process for the thermal cutting of a running, meltable fabric run and as to a device for carrying out the process according to the part of claim 6 describing the background art.
BACKGROUND ART
Processes and devices for the thermal cutting of a running, meltable fabric run are known in from several sources, e.g. from WO-A-9103592 and EP-A-0389793. With these known processes and devices the meltable fabric run is cut by means of a hot cutting wire, the cutting wire being inclined to the fabric run at an angle of 90.degree. perpendicular to the cutting direction. This involves the disadvantage that due to the melted mass produced at the cutting point, relatively hard and rough melted edges are produced on thermal cutting. According to EP-A-0389793 the attempt was made to avoid these disadvantages in that the edge areas with the melted edges are folded over along folding lines parallel with the edges of the cut, whereafter the folding legs are pressed flat onto the adjoining surface zones of the material strip and fastened there by gluing. This procedure is relatively complicated, and an also relatively thick edge area ensues.
From EP-A-0152672 the technique of cutting a running, meltable fabric run, in the process of which the cut edge is furnished with a beveled cut surface, is known. This purpose is served by an ultrasonic cutting head with a V-shaped cutting element which has the form of an anvil and which interacts with an ultrasonic horn. The melting head is produced in the fabric material by friction between the anvil and ultrasonic horn. Irrespective of the fact that this cutting head is very complicated and susceptible to wear, and that it has a relatively large space requirement, the fabric material is displaced by the V-shaped anvil and produces large beads which adversely affect the appearance and the feel of the fabric material. In addition, the cutting operation nevertheless only conditionally produces edges resistant to fraying.
DISCLOSURE OF THE INVENTION
The objective of the present invention is to devise a process and a device for the thermal cutting of a running, meltable fabric run by means of which the disadvantages mentioned above are avoided.
In accordance with the present invention, the process for the thermal cutting of a running, meltable fabric run is carried out by means of a hot cutting wire which extends in a plane extending essentially perpendicular to the the travel direction of the fabric run and is inclined at an angle of greater than 0.degree. and smaller than 90.degree. relative to the fabric run.
As a result of the inclined cut, on the one hand a part of the melt is allocated to a waste cutting strip, and on the other hand the melted edge is at the rear of the fabric run, so that it is not perceivable. The edges of the cut surface are rounded and essentially smooth. By virtue of the lengthened cut surface of the inclined cut by contrast with the perpendicular cut, the threads of the fabric run melt together better, thereby also improving the cut edge of the fabric run. By virtue of the inclined cut surface, the cut fabric run can be bent around significantly smaller radii without breaking than is the case with perpendicularly cut surfaces. The cutting operation can take place along a straight line and/or any given path.
The cut can be carried out by means of a single straight cutting wire in a correspondingly inclined position. Of special advantage is an embodiment in which the cutting wire is V-shaped, since two material runs can be cut simultaneously with a single cut, the part of the material run inside the Vs being removable as waste cutting. With this waste cutting a part of the melt produced by the cut is removed. A cut with a V-shaped cross section can be produced with an X-shaped cutting wire. Especially advantageous is an embodiment in which the projecting edge of the cut surface is arranged on the exterior side of the fabric run. This causes a greater quantity of the melt to be located at the rear of the fabric run
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patent: 4244102 (1981-01-01), Bolles
patent: 4334448 (1982-06-01), Messerschmitt
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patent: 4650961 (1987-03-01), Nespor
patent: 4806400 (1989-02-01), Sancaktar
patent: 4850844 (1989-07-01), Hunting
patent: 5065804 (1991-11-01), Kinuhata et al.
patent: 5101094 (1992-03-01), Keller et al.
"Hot Wire Cutter For Flexible Recording Media", Burr, P. and Paton, A., IBM Technical Disclosure Bulletin, vol. 25, No. 10, Mar. 1983.
Kueffner Friedrich
Rada Rinaldi I.
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