Coating apparatus – Solid member or material acting on coating after application – Running length work
Patent
1990-09-10
1992-09-29
Wityshyn, Michael G.
Coating apparatus
Solid member or material acting on coating after application
Running length work
101120, 118406, 118413, 118414, 118419, B05C 1104, B41F 1544
Patent
active
051511320
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to an arrangement for applying substances to a web of material, whereby a doctor blade is magnetically pressed against the material or a stencil by means of a work magnet and, when in working position, comes to lie against a profiled ledge.
THE RELATED ART
It is already known to arrange a magnetic table or a magnetic roller to face a doctor roll, so that the doctor blade made of a magnetizable material will be pressed against the web of material, respectively the stencil, and will apply to the web of material the substance supplied in front of it, when the web, respectively the stencil, continues to move. In order to prevent a deviation of the doctor roll, it has already been proposed to provide a support ledge behind the doctor roll; this is of interest particularly in the case of rollers with a small diameter, since it can prevent the substance to be applied from flowing back over the upper region of the roll, and this way to reach also the web of material behind the doctor roll. In another embodiment, a so-called baffle ledge for the dye is arranged in front of the roller, seen in the travel direction of the web of material, and this dye-stopping ledge influences the application process, depending on position and location, i.e. distance to the application plane.
A drawback of this state of the art consists in the fact that when the process is interrupted, the doctor-blade elements and the profiled ledge have to be handled separately, which requires more work, and that when doctor roll with a high ratio between diameter and length are used, there is the danger of bending them out of shape, making it impossible to reuse them. The smaller the diameter and the bigger the length, i.e. in the case of large work widths, the bigger the danger of bending and the more attention has to be given to the handling of the doctor rolls. The invention aims at eliminating these drawbacks of the state of the art by creating an arrangement which can be handled as a functional unit and wherein the danger of bending the doctor rolls with small diameters can be avoided as much as possible.
SUMMARY OF THE INVENTION
The invention is characterized in that in the profiled ledge at least one retaining magnet is provided, which keeps the doctor blade in rolling or sliding contact with the profiled ledge, when the working magnets are switched off, and lifts the doctor blade from the application surface, respectively the stencil.
Due to the invention, it has become possible to handle the doctor-blade elements and the profiled ledge as a functional unit. Further, it is no longer necessary in case of an interruption of the process, to either stop the motion of the stencil or to remove the doctor blade from the stencil, since as a result of the fact that the doctor blade is lifted at the moment of interruption, the stencils can continue to turn, without any undesirable effects. Besides, a self-positioning of the profile ledge, and thereby of the doctor-blade element, takes place and it is now possible to use a great variety of doctor blades and also to select doctor rolls with a great variety of diameters.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described in greater detail with the aid of the accompanying drawing.
FIGS. 1 and 2 show two embodiment examples of the arrangement according to the invention.
FIG. 1A is a sectional view of the support surfaces of the ledge along lines 1A--1A in FIG. 1. FIB. 2A is a sectional view of the doctor device taken along lines 2A--2A in FIG. 2.
FIG. 3 shows a detail, pertaining particularly to the embodiment according to FIG. 1.
FIGS. 4, and 5 to 8, as well as FIGS. 9 to 14, show further embodiments of the invention.
FIG. 12A is an embodiment showing two doctor devices one on top of the other according to the invention.
DETAILED DESCRIPTION
FIG. 1 shows an arrangement 1 of the simplest construction. A profiled ledge 6 is rotatably arranged over a magnetic table 2, on which a web of material 4 is guided in the travel direction 3. At a d
REFERENCES:
patent: 3216349 (1965-11-01), Kraft
patent: 3988986 (1976-11-01), Zimmer
patent: 4014289 (1977-03-01), Zimmer
patent: 4036129 (1977-07-01), Zimmer
patent: 4920914 (1990-05-01), Zimmer
Dubno Herbert
Wityshyn Michael G.
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