A logic circuitry package includes an interface to communicate with a print apparatus logic circuit and at least one logic circuit including at least one heater and a temperature sensor. The at least one logic circuit is configured to receive, via the interface, a heater command to address the at least one heater. The at least one logic circuit is configured to receive, via the interface, subsequent to the heater command, a sensor command corresponding to a sensor ID to address the temperature sensor. The at least one logic circuit is configured to transmit, via the interface, a digital value in response to the sensor command. The digital value corresponds to a print material level of a print material within a reservoir.

A liquid circulating device has: a supply flow path through which a liquid is supplied from a liquid supply source that stores the liquid to a liquid ejecting head that ejects the liquid; a collection flow path through which the liquid collected from the liquid ejecting head is returned to the supply flow path; and a liquid flowing portion that causes the liquid to flow in a circulation flow path including the supply flow path, the liquid ejecting head, and the collection flow path. An air capturing portion can capture bubbles and is provided in at least one of the supply flow path and collection flow path. The air capturing portion is disposed at a position higher than the position of the liquid ejecting head.

Some examples include a print substance reservoir for a printing system including a housing to be arranged within a printing device, the housing having an interior for containing a print substance and an exterior, an active vent valve to allow gases to travel from the interior to the exterior when the inlet is receiving the print substance, the active vent valve electrically energizable and de-energizable in response to signals corresponding to the transfer of the print substance into the housing, a passive inlet valve to open to allow air to enter the interior during removal of the print substance from the reservoir, the passive inlet valve biased to a closed position, and a passive pressure relief valve to open when pressure within the interior is greater than a predetermined pressure limit, the passive pressure relief valve biased to a closed position.

A liquid ejection head having a channel member which includes an ejection hole surface and a pressurization chamber surface opposite thereto. An actuator substrate overlaps the pressurization chamber surface. The channel member includes a plurality of ejection holes opening in the ejection hole surface, a plurality of pressurization chambers individually communicating with the plurality of ejection holes and arranged in plan view of the pressurization chamber surface, and a plurality of dummy pressurization chambers positioned outside of the predetermined region in plan view of the pressurization chamber surface. The actuator substrate includes a plurality of pressurization portions that individually pressurize the pressurization chambers, and a plurality of dummy pressurization portions that individually pressurize the dummy pressurization chambers. The dummy pressurization chambers communicate with each other via a plurality of communication paths. A closed space including the plurality of dummy pressurization chambers and the plurality of communication paths is hermetically closed.

A supply unit configured to which a liquid container is detachably attached includes a support member that extends along a guiding route crossing a vertical line and that includes a distal region in which a starting end of the guiding route is positioned and a proximal region in which a termination end of the guiding route is positioned, a pivot shaft that is arranged in the proximal region and that has an axis crossing both the vertical line and guiding route, and a liquid inlet that is arranged below the support member and that is configured to be coupled to the liquid container.

An ink delivery system for at least one printing module comprising a closed-loop ink recirculation circuit and a vacuum discharge circuit, which is configured to produce a vacuum condition in the at least one printing module. A method for delivering ink to the at least one printing module is also disclosed.

[Problem] To provide a droplet ejection device and a droplet ejection method with which a liquid material can be continuously delivered to an ejection head when the liquid material is delivered between arbitrary tanks. [Solution] Provided are a droplet ejection device and a droplet ejection method using the droplet ejection device, the droplet ejection device comprising a droplet ejection head; a supply tank that is in communication with a first positive pressure source; a collection tank that is in communication with a first negative pressure source; a replenishment tank that is in communication with the supply tank and the collection tank; an opening/closing valve A that opens and closes a flow passage communicating between the supply tank and the replenishment tank; an opening/closing valve B that opens and closes a flow passage communicating between the collection tank and the replenishment tank; a switching valve that switches communication between the replenishment tank and a second positive pressure source and communication between the replenishment tank and a second negative pressure source; and a control device, wherein the control device has an ejection mode in which a liquid material is ejected from the droplet ejection head, a replenishment mode in which the liquid material is delivered from the replenishment tank to the supply tank while the liquid material is delivered from the supply tank to the collection tank, and a collection mode in which the liquid material is delivered from the collection tank to the replenishment tank while the liquid material is delivered from the supply tank to the collection tank.

A logic circuitry package for a replaceable print apparatus component comprises an interface to communicate with a print apparatus logic circuit, and at least one logic circuit. The logic circuit may be configured to identify, from a command stream received from the print apparatus, parameters including a class parameter, and/or identify, from the command stream, a read request, and output, via the interface, a count value in response to a read request, the count value based on identified received parameters.

This disclosure describes integrated circuits which may be provided in logic circuitry packages and/or replaceable print apparatus components with print material reservoirs. An integrated circuit or logic circuitry package for a replaceable print apparatus component comprises an interface to communicate with a print apparatus logic circuit and at least one logic circuit.

A fluid interconnect system including a mating component having an inlet port and a liquid outlet, the inlet port configured to support an interconnector and the liquid outlet configured to engage with a print cartridge so that liquid flows from a liquid source, through the interconnector and the inlet port, and out of the liquid outlet into the print cartridge.