A VALVE UNIT OF A LIQUID JET PRINTER

摘要

In a liquid ink image forming apparatus a liquid ink valve unit including a movable elongated valve body is made to increase its maximum operatable frequency by cooling the valve body. This is attained according to the invention by letting at least a part of, preferably the return of, print liquid pumped into the valve unit or units pass by the valve body. This will prevent the valve unit from overheating when operated at high frequencies. In a preferred embodiment the print liquid is temperature regulated before it reaches the valve unit or units.