Screen printer and a screen printing method

Abstract

Screen printing is performed by using a pressure squeegee, a main squeegee, and a scraper squeegee. Since a screen is pressed by the pressure squeegee in advance, an angle between the main squeegee and the screen is kept constant. After printing is finished by the main squeegee, the scraper squeegee scrapes a remaining ink.

What is claimed is:  
     
         1 . A screen printer for performing screen printing on a work by using a squeegee, comprising: 
 a main squeegee for performing screen printing; and    a supplementary squeegee for supplementing screen printing by the main squeegee during screen printing by the main squeegee.    
     
     
         2 . The screen printer of  claim 1 , wherein the main squeegee is pressed on a screen in a determined angle, wherein the supplementary squeegee is pressed on the screen in an angle exceeding the determined angle.  
     
     
         3 . The screen printer of  claim 1 , wherein the supplementary squeegee is provided ahead of the main squeegee in a printing direction; wherein the supplementary squeegee is a pressure squeegee for pressing the screen on the work.  
     
     
         4 . The screen printer of  claim 3  further comprising a scraper attached at one of a place between the main squeegee and the pressure squeegee and a place ahead of the main squeegee and the pressure squeegee in the printing direction.  
     
     
         5 . The screen printer of  claim 4 , wherein the pressure squeegee is unified with one of the scraper and the main squeegee.  
     
     
         6 . The screen printer of  claim 1 , wherein the supplementary squeegee is provided behind the main squeegee in a printing direction, wherein the supplementary squeegee is a scraper squeegee for scraping an ink on a screen.  
     
     
         7 . The screen printer of  claim 6 , wherein the scraper squeegee is unified with the main squeegee.  
     
     
         8 . A screen printer comprising two squeegees, wherein the two squeegees are used together successively to print a determined area on a screen for one stroke.  
     
     
         9 . A screen printing method for a screen printer comprising a main squeegee and a supplementary squeegee comprising: 
 performing screen printing by moving of the main squeegee in a printing direction with pressing a screen; and    moving of the supplementary squeegee in the printing direction with pressing the screen by keeping a determined distance from the main squeegee in the printing direction during screen printing by the main squeegee.    
     
     
         10 . The screen printer of  claim 3 , wherein the pressure squeegee is a pair of squeegees provided outside of a printing pattern of screen printing.  
     
     
         11 . A screen printer for performing screen printing on a work by using a squeegee, comprising: 
 a main squeegee for performing screen printing; and    a pressure unit provided ahead in a printing direction during screen printing by the main squeegee for pressing a screen against the work.    
     
     
         12 . The screen printer of  claim 11 , wherein the pressure unit is a roller for rotating on the screen.  
     
     
         13 . The screen printer of  claim 12 , wherein the roller is a pair of rollers provided outside of a printing pattern of screen printing.  
     
     
         14 . The screen printer of  claim 11 , wherein the pressure unit is unified with a scraper.  
     
     
         15 . A screen printing method for a screen printer having a main squeegee and a pressure unit, comprising: 
 performing screen printing by moving the main squeegee in a printing direction with pressing a screen; and    moving the pressure unit in the printing direction with pressing the screen by keeping a determined distance in the printing direction from the main squeegee during screen printing by the main squeegee.    
     
     
         16 . A screen printer for performing screen printing, comprising a first squeegee and a second squeegee for moving forward and backward, wherein the first squeegee is a pressure squeegee for pressing the screen and the second squeegee is a main squeegee for performing screen printing in the forward movement, wherein the second squeegee is the pressure squeegee for pressing the screen and the first squeegee is the main squeegee for performing screen printing in the backward movement.  
     
     
         17 . The screen printer of  claim 16  further comprising a rotary unit for rotating the first and second squeegees and changing angles of the first and second squeegees against the screen.