Abstract: An inkjet printer includes: an ink container having an outlet port and a return port; a printhead having a first ink port and a second ink port; a first ink line interconnecting the outlet port and the first ink port; a second ink line interconnecting the return port and the second ink port; a bypass line interconnecting the first and second ink lines; a valve system for controlling fluid flow through the first ink line and the bypass line; and a controller for controlling the valve system. During printing, the controller is configured to open the first ink line and the bypass line.

Abstract: A fluid distribution system for a printhead. The system having a first fluid container a fluid connector for connection to a fluid input of the printhead; and a second fluid container connected between the first container and the connector for delivering fluid from the first container to the connector, wherein the second container is located relative to the first container and the connector so that a fluid pressure difference between fluid contained within the second container and fluid at the connector is independent of the amount of fluid contained within the first container.

Abstract: An inkjet printer includes: an ink container having an outlet port and a return port; a printhead having a first ink port and a second ink port; a first ink line interconnecting the outlet port and the first ink port; a second ink line interconnecting the return port and the second ink port; a bypass line interconnecting the first and second ink lines; a valve system for controlling fluid flow through the first ink line and the bypass line; and a controller for controlling the valve system. During printing, the controller is configured to open the first ink line and the bypass line.

Abstract: A fluid distribution system for a printhead, the system having a fluid container fluidically interconnected with the printhead via a closed fluid flow loop, a gas vent on the closed loop and a multi-path valve on the closed loop for selectively allowing venting of gas in the closed loop via the gas vent.

Abstract: A system for priming and de-priming a printhead, the system having a fluid container fluidically interconnected with the printhead via a closed fluid flow loop, a gas inlet on the closed loop and a valve on the closed loop for selectively allowing gas to enter the closed loop via the gas inlet, and a pump on the closed loop, wherein the pump is operational to draw fluid from the container in a first direction around the closed loop to prime the printhead with fluid from the container, and the vent is operational to cause fluid in the closed loop and the printhead to de-prime to the container in a second direction around the closed loop.

Abstract: A fluid distribution system for a printhead, the system having a fluid container fluidically interconnected with the printhead via a closed fluid flow loop, a bypass fluid path bypassing the printhead on the closed loop, a gas vent on the closed loop and a four-way valve on the closed loop for selectively allowing fluid flow along the closed loop via the printhead and the bypass path and venting of gas in the closed loop via the gas vent.

Abstract: A fluid distribution system for a printhead. The system having a first fluid container a fluid connector for connection to a fluid input of the printhead; and a second fluid container connected between the first container and the connector for delivering fluid from the first container to the connector, wherein the second container is located relative to the first container and the connector so that a fluid pressure difference between fluid contained within the second container and fluid at the connector is independent of the amount of fluid contained within the first container.

Abstract: A rotary valve for distributing ink from an ink source to a media width inkjet printhead, the valve having a body, a shaft rotatably mounted to the body, a channel cylinder arranged on the shaft to be rotatable therewith, the channel cylinder having a channel defined along its circumference, a port cylinder fixed to the body relative to the shaft so as to concentrically and sealingly enclose the channel cylinder, the port cylinder having a plurality of ports defined therethrough along its circumference for respective connection to the printhead and ink source, each port being aligned with a portion of the channel and a selection device for selectively rotating the shaft to establish interconnection between the ports and the channel thereby allowing ink flow between the ports via the channel.

Abstract: A multi-path valve for a media width inkjet printhead, the printhead being connected to an ink source via a closed ink flow loop, the valve having a body, a first port on the body for connection to the ink source, a second port on the body for connection to the printhead, a third port on the body for connection to a bypass ink path which bypasses the printhead on the closed loop, a fourth port on the body for connection to a gas vent on the closed loop, a chamber within the body via which the first, second, third and fourth ports are able to be interconnected and a selection device for selectively establishing interconnection between the first, second, third and fourth ports to allow ink flow therebetween.

Abstract: The invention provides a method for increasing the stability and/or activity of a polypeptide at low pH and/or elevated temperatures. The invention further provides a method for increasing the melting temperature of a polypeptide. Also provided are paleoenzymologically reconstructed thioredoxin polypeptides having activity at higher temperatures and/or lower pH than extant thioredoxin polypepetides, as well as paleoenzymologically reconstructed thioredoxin polypeptides having higher melting temperatures than extant thioredoxin polypepetides.

Abstract: A fluid distribution system for a printhead, the system having a fluid container, a first fluid path interconnecting the container and a first fluid port of the printhead, a second fluid path interconnecting the container and a second fluid port of the printhead, a third fluid path interconnecting the first and second paths, wherein the first, second and third paths are configured so that fluid from the container flows between the first and second paths via the printhead and via the third fluid path.

Abstract: A method of priming a media width printhead, the method having controlling operation of the printhead, with a controller of a printing system having the printhead, to draw fluid in a first direction around a closed fluid flow loop from a fluid container to the printhead and controlling operation of a pump on the closed loop, with the controller, to draw fluid from the container in an opposite, second direction around the closed loop.

Abstract: A system for priming and de-priming a printhead, the system having a fluid container fluidically interconnected with the printhead via a closed fluid flow loop, a gas inlet on the closed loop and a valve on the closed loop for selectively allowing gas to enter the closed loop via the gas inlet, and a pump on the closed loop, wherein the pump is operational to draw fluid from the container in a first direction around the closed loop to prime the printhead with fluid from the container, and the vent is operational to cause fluid in the closed loop and the printhead to de-prime to the container in a second direction around the closed loop.

Abstract: A fluid distribution system for a printhead, the system having a fluid container fluidically interconnected with the printhead via a closed fluid flow loop, a gas vent on the closed loop and a multi-path valve on the closed loop for selectively allowing venting of gas in the closed loop via the gas vent.

Abstract: A printing system having a fluid container, a media width printhead having a first fluid port at one longitudinal end of the media width and a second fluid port at the other longitudinal end of the media width, a first fluid path interconnecting the container and the first fluid port of the printhead, a second fluid path interconnecting the container and the second fluid port of the printhead, a third fluid path interconnecting the first and second paths, wherein the first, second and third paths are configured so that fluid from the container flows between the first and second paths via the printhead and via the third fluid path.

Abstract: A printing system having a media width printhead, a fluid container fluidically interconnected with the printhead via a closed fluid flow loop, a bypass fluid path bypassing the printhead on the closed loop and a multi-path valve on the closed loop for selectively allowing fluid flow along the closed loop via the printhead and the bypass path.

Abstract: A fluid distribution system for a printhead, the system having a plurality of fluid containers fluidically interconnected with the printhead via a respective plurality of closed fluid flow loops, a plurality of bypass fluid paths bypassing the printhead, each bypass path being associated with a respective one of the closed loops and a plurality of gas vents, each gas vent being associated with a respective one of the closed loops and a multi-channel four-way valve for selectively allowing fluid flow along each closed loop via the printhead and the bypass paths and venting of gas in each closed loop via the gas vents.

Abstract: A fluid distribution system for a printhead, the system having a plurality of fluid containers fluidically interconnected with the printhead via a respective plurality of closed fluid flow loops, a plurality of gas vents, each gas vent being associated with a respective one of the closed loops and a multi-path, multi-channel valve for selectively allowing venting of gas in each of the closed loops via the gas vents

Abstract: A fluid distribution system for a printhead, the system having a fluid container fluidically interconnected with the printhead via a closed fluid flow loop, a bypass fluid path bypassing the printhead on the closed loop and a multi-path valve on the closed loop for selectively allowing fluid flow along the closed loop via the printhead and the bypass path.

Abstract: A printing system having a media width printhead, a fluid container fluidically interconnected with the printhead via a closed fluid flow loop, a gas vent on the closed loop and a multi-path valve on the closed loop for selectively allowing venting of gas in the closed loop via the gas vent.