Abstract: An example fluidic device comprises a fluid reservoir having a porous media arranged within the reservoir, and a capillary structure. The capillary structure is in fluid communication with the porous media and the fluid reservoir and has tuned parameters corresponding to parameters of the fluid reservoir and the porous media. Wherein fluid within the capillary structure is to change level in response to pressure changes in the reservoir.

Abstract: An example fluidic device comprises a fluid reservoir and a capillary structure. The fluid reservoir has a porous media arranged within and the capillary structure is in fluid communication with the porous media reservoir and the fluid reservoir. The capillary structure has tuned parameters corresponding to parameters of the porous media. An internal fluid path of the capillary structure enables three or more fill readings based on a height of a fluid within the capillary structure and further based on the tuned parameters of the capillary structure.

Abstract: A recharge system can receive an indication of a saturation level of a porous media within a printhead and determine, based on the indication of the saturation level of the porous media, that the saturation level satisfies a threshold to initiate a recharge cycle. The threshold may be higher than a saturation level at which the porous media is in a hysteresis state. In response to the determination, the recharge system initiates a recharge cycle.

Abstract: A froth coalescing unit for a fluid delivery system for a fluid ejection system, the froth coalescing unit including a coalescing chamber including a sump, an inlet to receive froth into the coalescing chamber, the froth comprising a mixture of fluid and gas, the coalescing chamber to coalesce the fluid from the froth with the coalesced fluid collecting at least in the sump, an outlet to communicate coalesced fluid from the sump, and a fluid level sensor to provide a level over a range of levels of coalesced fluid in the coalescing chamber including in the sump.

Abstract: A froth coalescing device comprises a froth receiving chamber with a vent and an umbrella valve arranged between the vent and a gas out port. The vent may be arranged to vent gas in a direction different from a direction of travel of froth in the receiving chamber.

Abstract: Present examples provide a fluid ejection apparatus which may comprise a pump having a pump body and a plurality of diaphragms disposed in the pump body. A plurality of fluid chambers are each associated with the plurality of diaphragms. A timing mechanism may open a leading fluid chamber of the plurality of fluid chambers and close a trailing fluid chamber of the plurality of chambers simultaneously with movement of corresponding pairs of the diaphragms. A third fluid chamber may be in a dwell mode. The movement of the timing mechanism causes discreet packet transfer of fluid between the leading and trailing fluid chambers or between a fluid chamber and a coupling.

Abstract: In one example in accordance with the present disclosure, a fluid interface device (106) is described. The device includes a collar (110) to receive a fluid container (104). The collar has an aperture in one end surface. A needle (108) of the fluid interface device passes through the aperture and allows fluid to pass from the fluid container (104) into a reservoir (102). The needle is slideable within the aperture from a dosed position to an open position upon reception of the fluid container. A seal (212) is radially disposed around the needle (108) and seals against the end surface of the collar (110) when the needle is in the dosed position.

Abstract: A froth coalescing device includes a froth receiving chamber with a vent, and a vertical membrane arranged between the vent and a gas out port of the froth coalescing device. The vent is arranged to vent gas in a direction that is different from a direction of travel of froth in the froth receiving chamber.

Abstract: In one example in accordance with the present disclosure a device for coalescing a frothy fluid is described. The device includes a housing and alignment devices. The alignment devices receive a number of coalescing filters, space the number of coalescing filters to form a gap between adjacent coalescing filters, and seal the number of coalescing filters against the housing to enclose the gap. The device also includes an inlet port to drive incoming frothy fluid through the gap, an outlet port to drain coalesced fluid, and an air vent to allow air to escape the gap.

Abstract: A froth coalescing unit for a fluid delivery system for a fluid ejection system, the froth coalescing unit including a coalescing chamber including a sump, an inlet to receive froth into the coalescing chamber, the froth comprising a mixture of fluid and gas, the coalescing chamber to coalesce the fluid from the froth with the coalesced fluid collecting at least in the sump, an outlet to communicate coalesced fluid from the sump, and a fluid level sensor to provide a level over a range of levels of coalesced fluid in the coalescing chamber including in the sump.

Abstract: In one example in accordance with the present disclosure, a fluid interface device (106) is described. The device includes a collar (110) to receive a fluid container (104). The collar has an aperture in one end surface. A needle (108) of the fluid interface device passes through the aperture and allows fluid to pass from the fluid container (104) into a reservoir (102). The needle is slideable within the aperture from a dosed position to an open position upon reception of the fluid container. A seal (212) is radially disposed around the needle (108) and seals against the end surface of the collar (110) when the needle is in the dosed position.

Abstract: A froth coalescing device comprises a froth receiving chamber with a vent and an umbrella valve arranged between the vent and a gas out port. The vent may be arranged to vent gas in a direction different from a direction of travel of froth in the receiving chamber.

Abstract: A froth coalescing device includes a froth receiving chamber with a vent, and a vertical membrane arranged between the vent and a gas out port of the froth coalescing device. The vent is arranged to vent gas in a direction that is different from a direction of travel of froth in the froth receiving chamber.

Abstract: In one example in accordance with the present disclosure a device for coalescing a frothy fluid is described. The device includes a housing and alignment devices. The alignment devices receive a number of coalescing filters, space the number of coalescing filters to form a gap between adjacent coalescing filters, and seal the number of coalescing filters against the housing to enclose the gap. The device also includes an inlet port to drive incoming frothy fluid through the gap, an outlet port to drain coalesced fluid, and an air vent to allow air to escape the gap.

Abstract: In one example in accordance with the present disclosure a device for coalescing a frothy fluid is described. The device includes a housing and a filter disposed within the housing. An outside surface of the filter is separated from an inside surface of the housing by a gap. The filter is sealed against the housing to enclose the gap. An inlet port of the device drives incoming frothy fluid through the gap. An outlet port of the device drains liquid coalesced as bubbles in the frothy fluid dissipate and an air vent allows air to escape the gap.

Abstract: In one example, a multi-part flow structure with multiple flow passages includes a first part sandwiched between a second part and a third part, the parts joined together with adhesive along bonding surfaces surrounding the flow passages where each of the bonding surfaces on one part is symmetrical to and diverges from a corresponding one of the bonding surfaces on another part.

Abstract: In one example, a multi-part flow structure with multiple flow passages includes a first part sandwiched between a second part and a third part, the parts joined together with adhesive along bonding surfaces surrounding the flow passages where each of the bonding surfaces on one part is symmetrical to and diverges from a corresponding one of the bonding surfaces on another part.

Abstract: In one example, parts to be assembled into a fluid flow structure include: a first part having a first opening therein and a first adhesive bonding surface surrounding the first opening; a second part having a second opening therein and a second bonding surface surrounding the second opening; and the first and second bonding surfaces are each configured, when the parts are assembled for bonding and an adhesive is squished between the parts, to create a capillary force along the bonding surface urging adhesive away from the opening.

Abstract: In one example, parts to be assembled into a fluid flow structure include: a first part having a first opening therein and a first adhesive bonding surface surrounding the first opening; a second part having a second opening therein and a second bonding surface surrounding the second opening; and the first and second bonding surfaces are each configured, when the parts are assembled for bonding and an adhesive is squished between the parts, to create a capillary force along the bonding surface urging adhesive away from the opening.

Abstract: A fluid supply system for a printing device is disclosed. The fluid supply system includes an ink reservoir adapting member operatively disposed within an ink cartridge. The adapting member has an open end and an end opposed to the open end. The open end is adapted to have a filter disposed thereon. The opposed end is substantially angularly offset from the open end in a manner sufficient to substantially promote fluid and air migration toward a fluid conduit. A depth between the open end and the opposed end substantially varies along a length between two opposed sides of the adapting member. A predetermined area of the opposed end defines the fluid conduit, and the predetermined area is located at a region where the depth is substantially greatest. Further, the conduit is adapted to release fluid and air from the adapting member.