Patent ID: 7762184

Claim:
A production unit of electronic parts, comprising: an upper part sealed chamber housing a printing device for pressing and filling a plastic material into a work piece having one side and a perforated plate having a through hole pattern overlaid on one side of said work piece and passable by said plastic material; a lower part sealed chamber defined below said upper part sealed chamber with said perforated plate intervened between both said chambers and housing an alignment table, said alignment table positioning said work piece in a horizontal position with said one side directed upwardly, the height of said work piece being adjustable; and differential pressure generating means for generating a differential pressure between said upper part sealed chamber and said lower part sealed chamber; wherein said differential pressure generating means comprises: a vacuum pump connected to said upper part sealed chamber and said lower part sealed chamber; two leak valves connected to said upper part sealed chamber and said lower part sealed chamber, respectively; and a stop valve opening and closing between said upper part sealed chamber and said lower part sealed chamber and said vacuum pump; and wherein said vacuum pump vacuums said upper part sealed chamber and said lower part sealed chamber, and after printing, by combination of the operations of said two leak valves and the stop valve, the inflow of atmospheric air to said upper part sealed chamber and said lower part sealed chamber is individually allowed or sealed.