Printing – Stenciling – Rotary machines
Patent
1989-03-15
1990-09-11
Crowder, Clifford D.
Printing
Stenciling
Rotary machines
118213, B41F 1544
Patent
active
049552988
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a roller doctor or roller squeegee apparatus for applying material, such as optionally foamable substances of different viscosities, coating substances, varnishes, adhesives, pastes, etc. to a substrate, such as a material web. The material is applied with at least one doctor roller magnetically chargeable for exerting pressure that extends in the longitudinal direction of the apparatus (application width), and with roller supporting and guiding members arranged laterally of the apparatus. The doctor roller is held for rotation and is varied in position within the boundaries of a cage-like receptacle.
Such an apparatus is used for flat screen printing, rotary screen printing and/or for screen or patternfree, whole-surface applications in printing or coating machines. It is possible to carry out patterning applications (printing) and/or whole-surface applications (e.g. impregnation, coating, dyeing, varnishing). The doctor roller and/or parts engaging it can be magnetized and are magnetically engaged by a magnet beam positioned below the substrate in order to exert pressure on the doctor roller for the application of the material. The function of the lateral roller supporting/guiding members is to prevent unintentional deflections or changes in position of the doctor roller with respect to its desired printing or normal position and to allow a lifting out of and possible transporting of the doctor roller.
Known roller doctor apparatuses comprise support plates (roller supporting/guiding members) arranged laterally on a support crossbeam and each having a cage-like receptacle for terminal positional limitation of the doctor roller. The support arrangement consisting of the crossbeam and lateral support plates must be specially dimensioned for each coating or printing machine and for each printing station as a function of the length and diameter of a doctor roller. In addition, known roller doctor apparatuses are also equipped with lateral substance limiting plates, which are either rigidly connected to the support pipe and can be lowered onto the substrate, or are displaceable in a perpendicular direction with respect to the support crossbeam. Depending on the desired length of a doctor roller, such substance limiting plate arrangements must be specially designed. Therefore the known roller doctor apparatuses must be designed for each application (coating) type and/or width, dependent on the roller diameter, wherein, particularly in the case of an application machine having several printing stations, it is necessary to make available differently dimensioned parts and to fit these parts in special association for each printing station. This leads to relatively expensive apparatuses, which are unsatisfactory with respect to handling and operation. A relatively expensive and complicated machine parts stock has to be kept available for such apparatuses. Further, the assembly and disassembly is relatively time consuming and must be carried out with carefully sorted, precisely matched parts.
In view thereof, the present invention is based on the task to provide a roller doctor apparatus for holding doctor rollers, which apparatus is designed to be particularly simple and compact, and is easily handleable and universally usable. The apparatus of the invention can be used as a unit in modular construction with doctor rollers of different diameters and lengths, whilst being easily and rapidly assemblable and disassemblable.
In conjunction with the initially mentioned features, this task is solved in that the doctor apparatus comprises at least one roller fixing part, which is fitted loosely onto one end of the doctor roller and is connected by means of a plug connection to the adjacent, lateral roller supporting and guiding member. With the roller fixing part, which can be fitted onto the doctor roller, and its plug connection to the roller supporting/ guiding member, doctor rollers of different length and/or different diameter can be arranged between the roller 1 guiding members. The roller
REFERENCES:
patent: 4036129 (1977-07-01), Zimmer
patent: 4094241 (1978-06-01), Kossler
Gutler Franz
Mortl Engelbert
Zimmer Johannes
Crowder Clifford D.
Zimmer Johannes
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