Abstract: A screen printing apparatus for printing on a board, such as a circuit board, through a screen using a paste prior to surface-mounting electronic components on the board, and more particularly a screen printing apparatus that performs a screen printing while automatically discharging the paste that is accommodated inside the main body.

Abstract: The invention encompasses method and apparatus for cleaning screen used in screen printing machine for printing of solder paste onto a surface of a printed circuit board. The apparatus includes two upper and lower cleaning chambers 4, 5 which are provided on upper and lower sides of the screen 2 in opposed relationship with each other in such a manner that the two chambers are in watertight contact with the upper and lower surfaces 2A, 2B, of screen 2, respectively and are communicated with each other through openings 2C in the screen 2. The upper and lower cleaning chambers are essential components of the apparatus for carrying out cleaning the solder paste residue adhered to inner peripheral surfaces of the openings 2C in the screen 2 as well as the solder paste residue adhered to the upper and lower surfaces 2A, 2B from the screen 2. A wash liquid supply means is provided for supplying wash liquid into each of the chambers 4, 5 to wash away the past residues adhered to the screen 2.

Abstract: A printing paste supply degree can stir up and knead past contained in a syringe extremely efficiently and extrudes the paste in a condition suitable for a screen printing through a discharge opening of the syringe. The paste supply device comprises a syringe made from specific resin and a mixer unit which is fitted on an inlet end portion of the syringe.

Abstract: An apparatus for printing a viscous material onto a surface of a board through the medium of a screen having openings therein. The apparatus includes a viscous material dispenser of the type having a box-like housing in which a chamber for containing the material and a slit-like bottom aperture communicating therewith are provided. A pair of blades depend from the housing on opposite sides of the bottom aperture. A rear wall of the housing includes a fixed upper wall section and a height-adjustable lower wall section height-adjustably connected thereto. The lower wall section is connected to manually operable height-adjustable device mounted on the housing and for adjusting the height of the lower wall section having the squeegee blade so that by adjusting the height-adjustable device, the contacting pressure of the lower end of the squeegee blade to be applied against the upper surface of the screen can be adjusted as desired.

Abstract: A method for printing viscous material, such as solder paste, onto a surface of a board, such as a printed circuit board, through a screen having openings therein.

Abstract: An apparatus for printing a viscous material onto a surface of a board through the medium of a screen having openings therein. The apparatus comprises a viscous material dispenser (S) of the type having a box-like housing (A) in which a chamber (5) for containing the material and a slit-like bottom aperture (3) communicating therewith are provided. A pair of blades (2A, 2B) depend from the housing (A) on opposite sides of the bottom aperture (3). A rear wall (8) of the housing (A) comprises a fixed upper wall section (8A) and a lower flap wall section (8B) swingably and slidably connected thereto and depending therefrom. The lower flap wall section (8B) defines the rear side of the bottom aperture (3). One of said blades which serves as a squeegee blade is fixed to the flap wall section.

Abstract: A method for printing solder paste onto a surface of a printed circuit board through the medium of a screen having openings. The method includes feeding the paste into a chamber of a dispenser, dispensing the paste contained in the chamber onto a first side of the screen and onto the surface of the board from the dispenser through a slit-like aperture, removing paste residue from the first side of the screen by a blade extending from a first cleaning apparatus, removing paste residue from a second side of the screen by another blade extending from a second cleaning apparatus, and sucking and transporting the paste residue adhered to inner peripheral surfaces of openings in the screen as well as the paste residue being removed from the second side of the screen by a vacuum device connected to the second cleaning apparatus. The slit-like aperture of the dispenser is formed by a fixed front wall and a moveable rear wall selectively moving toward and away from the fixed front wall.