A printing apparatus includes an ejecting head that ejects ink droplets onto a surface of a printing medium (paper roll), a carriage on which the ejecting head is mounted, a platen that faces the ejecting head and supports the printing medium, a detector plate provided in the carriage and is displaced in accordance with an external force applied in response to contact with the printing medium, and an encoder that measures a displacement amount of the detector plate and outputs an output value corresponding to the displacement amount.

A liquid ejection head and a liquid ejection apparatus that can suppress the occurrence of ejection failure are provided. A pressing plate moves as the volume of a first pressure adjusting chamber decreases, thereby increasing a flow resistance of a passage connected to a supply passage through a second discharge passage relative to a flow resistance of a passage connected to the supply passage through a first discharge passage.

A liquid supply apparatus includes a holding member configured to detachably hold a tray on which a flexible container provided with a supply port for supplying a liquid to a printhead is placed; a press member configured to press the container attached to the liquid supply apparatus; a movable member configured to move the press member to a first position where the press member presses the container and a second position where a press amount of the press member for the container is smaller than at the first position; a first spring having one end locked on the press member and the other end locked on the holding member; and a second spring having one end locked on the press member and the other end locked on the movable member.

A fluidic dispensing device includes a housing having an exterior wall and a fluid reservoir. The exterior wall has a chip mounting surface defining a first plane and has a first opening. The fluid reservoir is in fluid communication with the first opening. An ejection chip is mounted to the chip mounting surface. The ejection chip is in fluid communication with the first opening. The ejection chip has a plurality of ejection nozzles oriented such that a fluid ejection direction is substantially orthogonal to the first plane. A stir bar is moveably confined within the fluid reservoir. The stir bar has a plurality of paddles and a rotational axis, with each of the plurality of paddles having a free end tip that intermittently faces toward the first opening that is in fluid communication with the ejection chip as the stir bar is rotated about the rotational axis.

A fluid ejection device includes a fluid slot, a first fluid ejection chamber communicated with the fluid slot and including a first drop ejecting element, a second fluid ejection chamber including a second drop ejecting element, and a fluid circulation path including a first portion communicated with the fluid slot and the second fluid ejection chamber, and a second portion communicated with the first fluid ejection chamber and the second fluid ejection chamber, with the fluid circulation path including a fluid circulating element within the first portion.

A liquid discharge module includes a valve body configured to openably close a nozzle; a driving body configured to expand and contract in a longitudinal direction of the driving body; a holding body holding the driving body and supporting the valve body at one end of the holding body in the longitudinal direction; a housing having a cylindrical shape and accommodating the holding body; a fixing member contacting against another end of the holding body in the longitudinal direction and including a slotted groove having a gap extending in the longitudinal direction, the fixing member fixed to the housing; and an expansion member configured to widen the gap of the slotted groove to fix an outer peripheral face of the fixing member to an inner peripheral face of the housing.

Printheads that jet print fluids. In an embodiment, a printhead comprises a plurality of jetting channels. Each jetting channel of the plurality includes a diaphragm, a pressure chamber, and a nozzle configured to jet a print fluid, and further includes one or more intra-chamber active mixers disposed in the pressure chamber. An intra-chamber active mixer comprises a cantilever having a connected end rigidly connected to a vertical side wall of the pressure chamber, and a free end that is free to move.

Printheads that jet print fluids. In an embodiment, a printhead comprises a plurality of jetting channels. Each jetting channel of the plurality includes a diaphragm, a pressure chamber, and a nozzle configured to jet a print fluid, and further includes one or more intra-chamber active mixers disposed in the pressure chamber. An intra-chamber active mixer comprises a cantilever having a connected end rigidly connected to a vertical side wall of the pressure chamber, and a free end that is free to move.

A liquid supply apparatus includes a holding member configured to detachably hold a tray, on which a flexible container provided with a supply port for supplying a liquid to a printhead, is placed, a press member configured to press the container attached to the liquid supply apparatus, a movable member configured to move the press member to a first position where the press member presses the container and a second position where a press amount of the press member for the container is less than at the first position, a first spring having one end locked on the press member and the other end locked on the holding member, and a second spring having one end locked on the press member and the other end locked on the movable member.