Brushing – scrubbing – and general cleaning – Machines – With air blast or suction
Reexamination Certificate
1998-11-30
2001-03-13
Moore, Chris K. (Department: 1744)
Brushing, scrubbing, and general cleaning
Machines
With air blast or suction
C015S093100, C015S256520, C015S308000, C101S425000
Reexamination Certificate
active
06199243
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates in general to screen printings and more specifically to a device for cleaning a screen plate used in the screen printing.
2. Description of the Prior Art
For printing electric circuit patterns on an insulating base board, a so-called “screen printing” has been hitherto used. The printing system employed in this printing comprises generally a screen plate (or mesh screen plate) which is put on an insulating base board to be printed, and a squeegee (viz., ink squeezing device) which runs on the screen plate while squeezing a given amount of viscous conductive ink onto the screen plate and pressing the screen plate against the insulating base board. With this, a desired circuit pattern of the conductive ink is printed on the surface of the insulating base board, which pattern coincides with a perforated print pattern defined by the screen plate. The base board thus printed is then removed from the screen plate and heated for fixing the printed circuit pattern. The screen plate is constructed of a stainless steel mesh or the like.
For improving the quality of the printed pattern on the base board, it is necessary to clean the screen plate at certain intervals. Hitherto, various cleaning devices have been proposed and put into practical use for such purpose. However, due to their inherent constructions, some of them fail to exhibit a satisfied cleaning effect and some are costly.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a screen cleaning device for use in the screen printing, which is free of the above-mentioned drawbacks.
According to a first aspect of the present invention, there is provided a cleaning device for cleaning a screen plate used in a screen printing, which comprises a base structure placed just below the screen plate; and first means carried on the base structure, the first means having a contact portion which contacts a lower surface of the screen plate to scrape off any foreign things from the lower surface when the base structure is moved in a direction parallel with a major surface of the screen plate.
According to a second aspect of the present invention, there is provided a cleaning device for cleaning a screen plate used in a screen printing, which comprises a base structure which can be placed just below the screen plate; a unit detachably connected to the base structure, the unit including at least one cleaning blade whose top is pressed against a lower surface of the screen plate; a cleaning paper intimately put between the top of the cleaning blade and the lower surface of the screen plate; a cleaning paper driving mechanism for moving the cleaning paper along a given traveling path which includes the top of the cleaning blade; a solvent supplying means for feeding the cleaning paper with a solvent; and moving means for moving the base structure in a direction parallel with a major surface of the screen plate.
According to a third aspect of the present invention, there is provided a cleaning device for cleaning a screen plate used in a screen printing, which comprises a rectangular housing; a cleaning blade mounted on an upper portion of the rectangular housing, the cleaning blade being inclined with respect to the screen plate; means for defining first, second and third vertically extending slits in opposed side walls of the housing; a drive shaft rotatably received in the first slot, the drive shaft having a star-like cross section; a press roller rotatably received in the first slot and put on the drive shaft; two guide rollers rotatably received in the second and third slots respectively; and an endless cleaning paper operatively put on a top of the cleaning blade, the press roller and the two guide rollers, the endless cleaning paper having a portion intimately put between the drive shaft and the press roller.
According to a fourth aspect of the present invention, there is provided a cleaning device for cleaning a screen plate used in a screen printing, which comprises a rectangular housing; a paper feeding roller operatively installed in the housing; a paper take-up roller operatively installed in the housing at a position remote from the feeding roller; a cleaning paper extending from the feeding roller to the take-up roller; a press member installed on the housing and pressed against a lower surface of the screen plate with the cleaning paper intimately put therebetween; a base plate pivotally connected to the housing; a pneumatic cylinder mounted on the base plate; a drive roller mounted on the base plate and driven by the pneumatic cylinder; a press roller rotatably installed in the housing; and means for transmitting rotation of the press roller to the take-up roller, wherein when the base plate is pivoted to a certain work position, the drive roller is pressed against the press roller with the cleaning paper tightly put therebetween.
According to a fifth aspect of the present invention, there is provided a cleaning device for cleaning a screen plate used in a screen printing, which comprises housing; a shaft rotatably disposed in the housing, the shaft having a plurality of cleaning blades disposed thereabout; first means for rotating the shaft so that tops of the cleaning blades hit a lower surface of the screen plate; and second means for supplying the cleaning blades with a solvent.
According to a sixth aspect of the present invention, there is provided a cleaning device for cleaning a screen plate used in a screen printing, which comprises a housing; a shaft rotatably disposed in the housing, the shaft having a plurality of cleaning blades disposed thereabout; first means for rotating the shaft so that tops of the cleaning blades hit a lower surface of the screen plate; cleaning rollers rotatably disposed on the housing in a manner to be pressed against the lower surface of the screen plate; a cleaning paper intimately disposed between each of the cleaning roller and the lower surface of the screen plate; second means for moving the cleaning paper along a given traveling path which includes the outer surfaces of the cleaning rollers; and third means for feeding the cleaning paper with a solvent.
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Foley & Lardner
Moore Chris K.
Tani Electronics Industry Co., Ltd.
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