Patent ID: 6105495
Filing Date: 2000-08-22
Classification: B41F,H05K

Abstract:
A screen printing apparatus, comprising:a screen with a plurality of opening holes therein forming a printing pattern,a squeegee for rotationally oscillating in a vertical direction around a specified longitudinal position, and that can be contacted with and pressed into said screen,a horizontal movement means for moving said squeegee in an approximately horizontal direction relative to said screen, said squeegee being contacted with and pressed into said screen and moved in the horizontal direction while printing paste on said screen is applied to a circuit board through the opening holes in said screen for printing,control means being operable:i) when the printing paste on said screen is printed and applied, for applying a force sufficient to cancel a weight of the squeegee in an elevating direction to elevate the squeegee, and for then applying a force to said squeegee to push it down in a lowering direction from respective longitudinal sides of said rotational center to contact said screen in a way to be pressed into said screen, andii) when said squeegee is moved in the approximately horizontal direction relative to said screen, for adjustably rotationally oscillating, and elevating and lowering said squeegee due to one or more of slope, swell, and warp conditions of said circuit board present in the approximately horizontal movement direction and length direction of said squeegee to fit said squeegee on the circuit board, so that said squeegee presses said screen into said circuit board while effecting a specified pressure flexibly of said squeegee fitting the circuit board.