Printing – Stenciling – Traveling-inker machines
Reexamination Certificate
1999-08-04
2001-03-20
Yan, Ren (Department: 2854)
Printing
Stenciling
Traveling-inker machines
C101S126000
Reexamination Certificate
active
06202551
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a screen printing apparatus, and more particularly to a screen printing apparatus which is structured so as to apply a creamed solder and an adhesive to a sheet of base plate on the assembly line, print a different pattern and further apply a printing agent such as a creamed solder, the adhesive and the like at a different thickness, at a stage of a printing process.
2. Description of the Prior Art
A base plate such as a printed board is fed to the next mounting process so as to be mounted with electronic parts thereon after being applied a creamed solder and the like thereto in accordance with a predetermined pattern by a screen printing machine.
Then, after mounting the electronic parts to the base plate, the adhesive is applied to the base plate or in some cases, the creamed solder is again applied to the base plate in accordance with another pattern, however, this operation can not be performed for printing by using a mask since the electronic parts are mounted on a surface thereof.
Accordingly, it has conventionally been unavoidable to perform the operation by using a nozzle. However, much labor is required for performing the operation under a state that a large number of electronic parts are mounted, so that a large time loss is caused. Further, in the case of applying the creamed solder in another pattern, it is necessary to again mount the electronic parts thereafter, so that a double labor is required.
SUMMARY OF THE INVENTION
The present invention is made by taking the points mentioned above into consideration, and an object of the present invention is to provide a screen printing apparatus which is structured so as to simultaneously apply a creamed solder and an adhesive to a sheet of base plate on the assembly line or print a different pattern and further apply the creamed solder and the like at a different thickness, at a stage of a printing process, thereby solving the problems mentioned above.
In accordance with a first aspect of the present invention, there is provided a screen printing apparatus comprising a squeegee apparatus having a plurality of mask frames arranged along a direction of transferring a base plate, a fixed supporting plate arranged above said mask frames so as to override the mask frames, squeegee supporting plates mounted to said fixed supporting plate at an interval corresponding to said mask frames and structured so as to move along the direction of transferring the base plate at a suitable timing, and squeegees mounted to the squeegee supporting plates and vertically moving at a suitable timing.
In accordance with a second aspect of the present invention, there is provided a screen printing apparatus comprising a squeegee apparatus having a plurality of mask frames arranged along a direction of transferring a base plate, a fixed supporting plate arranged above said mask frames so as to override the mask frames, squeegee supporting plates mounted to said fixed supporting plate at an interval corresponding to said mask frames and structured so as to move along the direction of transferring the base plate at a suitable timing, and squeegees mounted to the squeegee supporting plates and vertically moving at a suitable timing, and a table for mounting the base plate, which is structured so as to be arranged below said mask frames at an interval corresponding to said mask frames, move in the direction of transferring the base plate and a direction perpendicular to the transferring direction at a predetermined timing and perform a vertical movement and a rotation in a horizontal direction.
In accordance with a third aspect of the present invention, there is provided a screen printing apparatus comprising a squeegee apparatus having a plurality of mask frames arranged along a direction of transferring a base plate, a position identifying camera for identifying a position of the base plate with respect to the mask, which is arranged above said mask frame and structured so as to move along the direction of transferring the base plate and a direction perpendicular to the transferring direction at a predetermined stroke, a fixed supporting plate arranged above said mask frames so as to override the mask frames, squeegee supporting plates mounted to said fixed supporting plate at an interval corresponding to said mask frames and structured so as to move along the direction of transferring the base plate at a suitable timing, and squeegees mounted to the squeegee supporting plates and vertically moving at a suitable timing, and a table for mounting the base plate, which is structured so as to be arranged below said mask frames at an interval corresponding to said mask frames, move in the direction of transferring the base plate and a direction perpendicular to the transferring direction at a predetermined timing and perform a vertical movement and a rotation in a horizontal direction.
REFERENCES:
patent: 5361694 (1994-11-01), Dubuit
patent: 5873939 (1999-02-01), Doyle et al.
patent: 6089149 (2000-07-01), Zelko
patent: 574760 (1993-12-01), None
patent: 2128933 (1984-05-01), None
Bacon & Thomas PLLC
Minami Co. Ltd.
Yan Ren
LandOfFree
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