Printing – Intaglio – Bed-and-cylinder machines
Patent
1994-01-28
1995-12-26
Fisher, J. Reed
Printing
Intaglio
Bed-and-cylinder machines
101356, B41F 381, B41F 300
Patent
active
054777836
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an apparatus capable of forming a thin film of a uniform thickness.
Background Art
As a thin film-forming apparatus for forming a high molecular thin film pattern such as a liquid crystal-oriented film for use in electronic components, for example, the following apparatus as shown in FIG. 5 is proposed (Examined Japanese Patent Publication No. 3-11630). The apparatus comprises an anilox roll 150 having a great number of ink cells 150a on the periphery thereof; an ink supply device 151 for charging ink into the ink cells 150a; a printing roll 152 having projections 152a to which the ink of the anilox roll 150 is transferred; and a printing table 154 for fixing thereto a material to be printed 153 to which the ink of the printing roll 152 is transferred. This thin film-forming apparatus is so constructed that the printing roll 152 and the anilox roll 150 are synchronously driven by a driving motor 155 for driving the printing roll 152 via a pair of pinions 156 and 156 so as to form a thin film on the material 153 in a uniform thickness.
However, even though the anilox roll and the printing roll are to be synchronously driven by the pair of pinions, there is a play between the pinions. As a result, nonuniform rotation or backlash is liable to occur between the anilox roll and the printing roll and thus the difference in the rotational speed between the anilox roll and the printing roll cannot be set to a desired value. Consequently, it is difficult to form a thin film with a uniform thickness.
It is therefore an object of the present invention to solve the above-described disadvantage and provide a thin film-forming apparatus capable of setting the difference in the rotational speeds between the anilox roll and the printing roll to a desired value and forming a smoother thin film with a more uniform thickness on a material to be printed.
Summary of the Invention
In accomplishing the above object, according to the present invention, the anilox roll and the printing roll are driven independently of each other and controlled set the difference in the rotational speeds between the anilox roll and the printing roll within a predetermined range.
That is, according to one aspect of the present invention, a thin film-forming apparatus comprises: an anilox roll having a large number of ink cells; an ink supply device for charging ink into the ink cells of the anilox roll; a printing roll having a projection contacting the anilox roll and transferring the ink in the ink cells of the anilox roll to the projection; a printing table for fixing a material to be printed thereto and bringing the material into contact with the projection of the printing roll so as to transfer the ink on the projection of the printing roll to a surface of the material; a first driving device for rotating the anilox roll; a second driving device for rotating the printing roll independently of the anilox roll; and control means for controlling the first and second driving devices so that the anilox roll and the printing roll rotate synchronously.
According to another aspect of the present invention, a thin film-forming apparatus comprises: an anilox roll having a large number of ink cells; an ink supply device for charging ink into the ink cells of the anilox roll; a printing roll having a projection contacting the anilox roll and transferring the ink in the ink cells of the anilox roll to the projection; a printing table for fixing a material to be printed thereto and bringing the material into contact with the projection of the printing roll so as to transfer the ink on the projection of the printing roll to a surface of the material; a first driving device for rotating the anilox roll; a second driving device for rotating the printing roll independently of the anilox roll; and control means for controlling the first and second driving devices so that a difference in rotational speeds between the anilox roll and the printing roll is greater than 0% and equal to or smaller than 1%.
Accordi
REFERENCES:
patent: 3467008 (1969-09-01), Domoter
patent: 4625643 (1986-12-01), Davis
patent: 4841857 (1989-06-01), Hashimura et al.
Fisher J. Reed
Nissha Printing Co. Ltd.
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