| 摘要 |
PCT No. PCT/EP90/02125 Sec. 371 Date Jun. 5, 1992 Sec. 102(e) Date Jun. 5, 1992 PCT Filed Dec. 11, 1990 PCT Pub. No. WO91/08903 PCT Pub. Date Jun. 27, 1991.Liquid jet printer device for recording information on an information carrier in the form of characters or symbols. A print head forms a part of the device and a plurality of liquid channels are arranged therein to discharge a series of liquid jets or liquid droplets according to a predetermined pattern during predetermined printing periods. The liquid channels in the print head present outlet openings for the discharge of print liquid under pressure, and valves included therein, switchable for opening and closing respectively the liquid channels. Inlet ends connect the liquid channels to a supply conduit for delivery of print liquid via a pump under pressure from a liquid container. The device maintains an operating pressure in the supply conduit only during those printing periods during which printing takes place. Pressure relief occurs during idle periods between printing periods to atmospheric pressure or sub-atmospheric pressure. During the idle periods, a small return flow of print liquid occurs so that the outlet openings are substantially emptied of print liquid.
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