Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Reexamination Certificate
1999-04-23
2001-03-27
Walberg, Teresa (Department: 3742)
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
C156S251000, C156S267000, C083S170000, C083S015000
Reexamination Certificate
active
06207930
ABSTRACT:
The invention pertains to a device of the type indicated in the introductory clause of Claim
1
.
To produce strips of labels, a weaving machine is first used to produce a wide web, which is made up of several rows of labels side by side in adjacent zones of the web, these rows being attached to each other along their edges. Then the wide web is cut along the boundaries between the individual zones by fusion cutters to produce separate tapes. For this purpose, a heated wire, for example, can be permanently mounted in the path of the wide web to cut the web by melting it through. This wire simultaneously fuses the cut ends of the threads together, so that they cannot fray out. Fused edges are thus formed on the tapes. These fused edges are relatively hard, and, unless they are given a finishing treatment, they have a rough profile. If the unfinished labels are attached to articles of clothing, the rough edges of the tapes produce an unpleasant feeling when the article is worn.
To eliminate the rough, fused edges of the tapes, a finishing device is used to smooth their edges. In the known device of the type cited in the introductory clause of Claim
1
(WO 93/02,246), two rolls are used to finish the rough edges of the tapes; these rolls are pressed together as the cut tapes are pulled between them. A wire is used as the fusion cutter. Simply because of the diameter of the knife roll, this finishing device must be installed a considerable distance away from the heating wire. The fused edges of the tapes coming from the heating wire harden on their way to the rolls. Therefore, it is necessary to heat the rolls by means of an independent heat source. In addition, springs are required to press the two rolls against the fused edges. In the case of tapes consisting of rows of patterned labels, the thickness of the tape can differ considerably from one region to another. This known device occupies a relatively large amount of space and is expensive.
In another known device of this type (GB-A 2,139,947), a heated pad is used for finishing. This pad is pressed by a spring-loaded piston against the fused edges of the tapes to be treated. This device also occupies a relatively large amount of space.
In a known device of a different type, which does not provide for any finishing of the rough, fused edges (DD-A 38,545), comb-like elements fitting between adjacent tapes are used to prevent the cut edges from sticking to each other. This effect is supported by fingers, which act on the central zone of the cut tapes and deflect adjacent tapes in alternate directions, one up and the other down. These fingers are not allowed to touch the edge areas, because this would prevent adjacent tapes from spreading as desired.
In a resistance-heated cutting device for textile webs, which again does not offer any means of finishing the rough edges of the tapes (DE-C1 195-10, 818), the tape is simply sent straight through. The housing holding the heated wire is located in the gap between the fused edges of adjacent tapes.
The invention is based on the task of developing the simplest possible, trouble-free finishing device of the general type described in the introductory clause of Claim
1
, which is designed in such a way that it saves space and can be produced inexpensively. This goal is accomplished according to the invention by means of the features given in claim
1
, which have the following specific meaning:
As a finishing device, the invention uses at least two deflection points, which are offset with respect to the tapes both in the longitudinal direction and also in the vertical direction. These points act on the section of the tape to be processed. For this purpose, deflecting elements are provided at the edges of the tapes; these elements do not require any springs or guides to press them together. The invention provides a free space between the deflecting elements, through which the section of the tape to be processed passes without being held but nevertheless in such a way that the deflecting elements cause the edges of the tape to extend slightly at an angle out of a straight course. The vertical offset of the deflecting elements in the edge area does not need to be more than a few millimeters.
The invention has recognized that, as a result of this deflection of the section of the tape to be processed, the longitudinal tension serving to transport the wide web and the tapes into which it is cut can be used to apply the pressure to which the edge areas must be subjected. That is, this deflection has the effect of converting some of the tension acting in the longitudinal direction of the tape into a transversely directed force component, and this transverse force is able to generate the required pressure. The longitudinal tension required in any case to transport the wide web and the tapes thus acquires the new function of ensuring the smoothing of the cut edges of the tapes. The transport device used to produce the longitudinal tension cooperates in the finishing of the fused edges.
It is advantageous to provide at least two, preferably three, deflection points, against which, in sequence, first the edge areas of the top side and then the edge areas of the bottom side are pulled. As a result, the fused edges are smoothed, and tapes with ideally smooth, soft edges are obtained. This design is very simple, compact, and inexpensive. There is no need in the device according to the invention for any springs or guides for pressure-exerting components such as those required in the known finishing devices.
REFERENCES:
patent: 4069727 (1978-01-01), Sparks et al.
patent: 4384908 (1983-05-01), Kleist
patent: 5101094 (1992-03-01), Keller et al.
patent: 5115839 (1992-05-01), Speich
patent: 678953 (1991-11-01), None
patent: 2300686 (1974-07-01), None
patent: 2516057 (1976-10-01), None
patent: 9302246 (1993-02-01), None
patent: 9713023 (1997-04-01), None
Fuqua Shawntina T.
Kueffner Friedrich
Vaupel Textilmaschinen GmbH & Co. KG
Walberg Teresa
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