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US 4,903,593 AGranted
Apparatus for screen length and snap-off angle control
OwnerOozeki Masanaoinventor
Life of this patent
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Abstract
An improved screen printing machine includes a screen held over a surface to be printed, a squeegee, a drive assembly which moves at least one end of the screen along a locus that enables substantially uniform maintenance of the length of the screen as well as the snap-off angle formed between the screen and the plane of the surface on the side of the squeegee opposite to where the squeegee carries its inking edge at the lower end thereof so as to provide substantially no dimensional deviation from the original and with enhanced uniformity in the thickness of the ink that is transferred.
Claims6
An improved screen printing machine comprising:
- a screen held over a surface to be printed, said screen having first and second movable ends,
- a squeegee having an inking edge at a lower end thereof and in contact with said screen for transferring ink to said screen, and
- drive means for moving said first and second ends of said screen in unison with said squeegee on said screen along loci so that:
- (a) the length of said screen is maintained substantially constant throughout said movement, and
- (b) a snap-off angle formed between the screen and the surface, on one side of the squeegee at a position opposite to the inking edge of the squeegee, is maintained substantially constant throughout the entire movement of said squeegee for ink transfer, and
- (c) an opposite angle formed between the screen and the surface, on an opposite side of the squeegee, is maintained substantially constant throughout the entire movement of said squeegee.
3 more elements
Dependencies are inferred from the claim text.