| 摘要 |
<p>BO981028 The ingestion of air into the print head of an ink jet printer is controlled by a secondary fluidic system. The secondary fluidic system interconnects the ink supply cavity of the head with the primary fluidic system of the printer. The secondary fluidic system includes a valve which is coupled to a venting port of the print head. A rapid decompression regulator is coupled to the valve. The exit port of the regulator is attached to one end of a conduit. The other end of the conduit is disposed in a fluidcontaining reservoir. The reservoir serves as an expansion/contraction chamber and keeps air from entering the head even under extreme thermocycling conditions. Likewise, the regulator controls the pressure in the head so that head pressure (Ph) is greater than or equal to ambient pressure Pa. This pressure differential prevents air from entering the head.</p> |
