Bleaching and dyeing; fluid treatment and chemical modification – Process of printing permanently on substrate – other than...
Patent
1996-08-09
1998-06-09
Einsmann, Margaret
Bleaching and dyeing; fluid treatment and chemical modification
Process of printing permanently on substrate, other than...
211 156, D06P 500, A47F 5025
Patent
active
057626499
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a storage apparatus for round stencils which are used in particular in the textile sector. The invention further concerns an applicator system, in particular for textile printing, and an application process.
For printing on a moving web, in particular for textile printing, it is already best known to arrange a plurality of round stencils in succession in a production apparatus, application of a substance, for example an ink or dye, being effected by means of applicator devices disposed in the interior of the round stencil. The applicator device includes for example an ink tube extending axially through the round stencil and a roller squeegee which presses the ink through the round stencil outwardly onto the textile web. Production apparatuses of that kind achieve high application rates of up to 100 m/minute and above. On the other hand textile printing is switching over to shorter and shorter textile web lengths which are printed upon, with the same pattern. The lower limit nowadays is typically about 500 m. That corresponds to a very short printing time of for example 5 minutes. Then, the pattern is to be changed, which means that the round stencils of the production apparatus must be at least partially exchanged. Hitherto, in the case of a typical production apparatus with a plurality of round stencils, an exchange operation of that kind lasted for a time of the order of magnitude of 45 minutes. In comparison with an extremely short production time of 5 minutes such a stoppage time is unprofitable and there is thus a wish to make such stoppage times shorter. In addition the aim is that the sensitive round stencils can be stored without the risk of damage.
In accordance with the invention that is achieved by two or more holders for releasably holding the round stencils, wherein the holders of the storage apparatus are movable by way of a drive, preferably jointly.
There is therefore proposed a special storage apparatus for round stencils, with which it is possible for a round stencil which has been removed from the production apparatus to be easily fitted into the storage apparatus. By way of the drive for the holders, the storage apparatus can be advanced with a stepwise motion so that a new storage position always comes into the entry/exit location for round stencils while the other round stencils can move away in the same storage apparatus. The round stencils are kept safe in the storage apparatus and protected from damage.
The storage apparatus can be designed for example on the basis of the paternoster principle with an endlessly circulating chain to which the holders for the round stencils are fixed at equal spacings.
Such a storage apparatus, particularly in combination with a production apparatus of the kind set forth in the opening part of this specification, can provide an applicator system with which it is quickly and easily possible to convert the production apparatus. For that purpose for example the procedure can be as follows: a round stencil which has been used, preferably together with the applicator device (in particular the ink tube) disposed therein is removed and it is suspended, preferably by way of the ink tube, in the storage apparatus which is closely adjacent in terms of space. A fresh round stencil is then taken from the storage apparatus and fitted into the production apparatus.
Thereupon a second round stencil is removed from the production apparatus and it is suspended in the storage apparatus at the space which has become free, and once again a fresh round stencil is fitted from the storage apparatus into the production apparatus, etc. When using that method it is possible without unnecessary double movements to convert the production apparatus quickly and easily to a fresh set of round stencils. Therefore, in combination with the production apparatus, the storage apparatus represents a system for faster conversion. It is possible to achieve conversion times per stencil of far less than 1 minute, and it is thus possible considerably to reduce the conve
REFERENCES:
patent: 2880878 (1959-04-01), Collette
patent: 5161698 (1992-11-01), Hatouchi et al.
Einsmann Margaret
J. Zimmer Maschinenbau Gesellschaft m.b.H.
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