Patent ID: 8888210
Filing Date: 2014-11-18
Classification: B41J

Abstract:
1. An ink delivery system comprising: a first tank including a fill sensor; a second tank including a fill sensor, wherein the first tank is in direct fluid communication with the second tank; a pump configured to pump ink supplied from the first tank to the second tank; a third tank including a fill sensor; and a plurality of flow-through, drop-on-demand print heads in direct fluid communication by conduit or passageway with each of the second tank and the third tank, wherein the third tank is in fluid communication with the first tank, the second tank is in fluid communication with the third tank, negative pressure is provided in the third tank, ink can be controllably jetted on demand from the print heads, a pressure differential across the print heads causes unjetted ink to flow through the print heads and directly into one of the second tank or third tank by conduit or passageway, a substantially constant meniscus pressure can be maintained at the print heads, and ink can be controllably jetted from the print heads at substantially the same velocity irrespective of the orientation of the print head with respect to the direction of gravity.