Coating apparatus – Solid member or material acting on coating after application – Rotary member
Patent
1989-07-13
1991-02-19
Woo, Jay W.
Coating apparatus
Solid member or material acting on coating after application
Rotary member
118119, 118126, 118413, 118414, B05C 1104, B41F 1542
Patent
active
049933523
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a squeegee device for applying materials such as an optionally foamable substances of different viscosity, coating substances, varnishes, adhesives, pastes, etc. to an application surface (substrate) with at least one squeegee extending in the longitudinal direction of the squeegee device and which is pressable by magnetic force. The squeegee device comprises a profile member extending with its longitudinal axis in the direction of the longitudinal axis of the squeegee and a bearing for articulating the profile member. The squeegee and/or profile member are made at least partly from magnetically acting parts. Such a squeegee device, in which the squeegee is constructed optionally with a nozzle integrated therein, is used in machines for flat stencil printing, round stencil applications and/or means for stencil-less, full-surface applications with respect to the application width, the squeegee extension being in particular several meters. As a function of the machine type, it is possible to carry out patterning applications (printing) and/or full-surface applications (e.g. impregnation, coating, dyeing and varnishing).
A squeegee and/or a squeegee device incorporating the same has great significance in connection with the handling of an applying device and in connection with the substance application result. It is known to provide on the back of a pivotably held sheet spreading doctor a magnetizable strip firmly connected to the latter over the application width. By means of the same, the doctor can be magnetically pressed by the magnetic force of a magnetic beam or bar arranged below the application surface in the direction of the latter (DE-OS 34 19 590). A squeegee device is also known (DE-OS 25 44 784), in which a squeegee roller is magnetically pressable against the back of a separately arranged profile strip spaced from the rolling surface of the squeegee roller. In addition, devices are known which have mechanically pressable squeegees, which are laterally fixed and pressed in the direction of the application surface. In all cases the squeegee or a strip or ledge engaging thereon are fixed between two bearings in the vicinity of the longitudinal side ends of said components. It is necessary to ensure with such bearing means longitudinal side coinciding bearing adjustments and optionally an identical mechanical force introduction. Such complicated bearing and/or pressing means, due to the unavoidable operational and fixing forces, lead to distortions and possibly permanent bending and therefore to damage and uncontrolled transverse positioning and/or mispositioning of the squeegee, so that the quality of the application result on starting an applying device and also during operation is considerably impaired and even made completely unusable due to sudden irregularities along the application surface. It must also be borne in mind that particularly with large application widths even minimum doctor distortions can have very disadvantageous effects on the printing result. Thus, optionally a time-consuming, costly readjustment of the squeegee device and/or even replacement of damaged doctors is necessary.
In view thereof, it is the object of the present invention to provide a squeegee device comprising at least one magnetically pressable squeegee, with a bearing means, which ensures a tilting-free, bending-free, as well as printing-precise self-adjustment and orientation of the squeegee on an application surface.
In conjunction with the features of the initially mentioned squeegee device, this task is solved in that the bearing means is constructed as a pivot bearing means arranged on the profile member forming or guiding the squeegee and with which the profile member is freely tiltable with respect to a position parallel to the application surface about at least one pivot axis perpendicular to its longitudinal axis. The inventive squeegee profile member with free pivot bearing means about at least one axis perpendicular to the profile member longitudinal axis ensures a distortion-
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patent: 4637338 (1987-01-01), Wohrle
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Nguyen Khanh P.
Woo Jay W.
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