Closed ink fountain

The utility model relates to an ink fountain, in particular to a closed ink fountain. The closed ink fountain comprises an ink fountain body, a thread wheel and ink lines, wherein the ink fountain body is formed by butt joint; a U-shaped cylinder of an ink chamber is communicated with a U-shaped cylinder cavity of a thread wheel chamber; an ink chamber cover is covered at the port of the U-shaped cylinder of the ink chamber, and a thread wheel chamber cover is covered at the port of the U-shaped cylinder of the thread wheel; a thread wheel shaft is inserted into the U-shaped cylinder of the thread wheel chamber; and the thread wheel is sleeved on the thread wheel shaft, one end of the thread wheel shaft is fixed by a locking nut, and the other end of the thread wheel shaft is sleeved with a hand wheel which is provided with a crank. The ink fountain separates the ink chamber from the thread wheel chamber independently so that the ink does not pollute the thread wheel and the fluency of the thread wheel in use