There is provided a liquid discharge apparatus including: a conveyer; head chips; a circulation channel; and a controller. Each head chip includes a manifold; a nozzle group, and actuators. Each head chip is configured to execute discharge drive and non-discharge vibration drive. The head chips include: an end head chip; a facing head chip facing the recording medium; and a non-facing head chip not facing the recording medium. The controller is configured to make at least one of a circulation flowing amount of a liquid in the circulation channel in the facing head chip and a frequency of the non-discharge vibration drive by an actuator included in the actuators in the facing head chip larger than those of the non-facing head chip.

An inkjet recording apparatus includes a recording head, a housing, a cap unit, a protrusion and a guide part. The recording head has an ink ejecting port on a lower face. The housing supports the recording head. The cap unit includes a cap. The cap unit is inserted into a space below the recording head in a predetermined direction to be attached to the housing and to cover the lower face of the recording head with the cap. The protrusion is protruded from a lower portion of the housing on a rear side in the predetermined direction more downward than the lower face of the recording head. The guide part is formed in an upper portion of the cap unit on the rear side in the predetermined direction and comes into contact with the protrusion so as to guide insertion and removal of the cap unit.

A cleaning device for printing heads arranged in a group along an alignment direction (Y) with a lower surface lying on a main plane (T). The device comprises a collecting head (2), movable along the alignment direction (Y) on the main plane (Y), in contact with or near the lower surfaces of the heads. The print head (2) is movable between a first and a second position that are located at the ends of the group of heads. The collecting head (2) is provided with an inlet opening (21) for collecting material from the heads (T).

A medium processing apparatus includes an intermediate stacker on which media recorded by a recording apparatus are stacked, the recording apparatus including a liquid ejection head which performs recording by ejecting liquid to media and a maintenance apparatus which performs maintenance of the liquid ejection head, and a processor which executes a process on the media received by the intermediate stacker. The medium processing apparatus executes the process after a medium which is last recorded before the maintenance is stacked on the intermediate stacker.

When performing on-sheet preliminary ink ejection, a control unit (a) determines a nozzle that performs the on-sheet preliminary ink ejection, (b) randomly selects on a print sheet an ejection position candidate of an ink droplet ejected from the determined nozzle, (c) determines whether the selected ejection position candidate is included by a mask area that includes a postprocessing object, (d1) if the selected ejection position candidate is not included by the mask area, sets as the selected ejection position candidate an ejection position of an ink droplet ejected from the determined nozzle, and (d2) if the selected ejection position candidate is included by the mask area, does not set as the selected ejection position candidate an ejection position of an ink droplet ejected from the determined nozzle and sets an ejection position of an ink droplet ejected from the determined nozzle outside of the mask area.

A recording head recovery system includes a recording head, a cleaning liquid tank for storing cleaning liquid, a cleaning liquid supplying path which connects together the cleaning liquid tank and the recording head, a liquid supply mechanism which is provided in the cleaning liquid supplying path, and a controller. The controller performs recording head recovery operation including cleaning liquid supplying operation for supplying the cleaning liquid from liquid supplying openings of the recording head, wiping operation for wiping an ink ejection face of the recording head while a wiper retains the cleaning liquid, and backflow operation for controlling the liquid supply mechanism to make the cleaning liquid in the cleaning liquid supplying path to flow from the cleaning liquid supplying openings to the cleaning liquid tank.

A method of installing a printhead in a print module includes the steps of: positioning the printhead in a nest of the print module; moving first and second ink couplings towards the nest and into engagement with complementary first and second ink ports positioned at opposite ends of the printhead; and moving a depressor towards the nest and into urging engagement with a portion of the printhead positioned between the first and second ink ports. The first ink coupling, the second ink coupling and the depressor are moved simultaneously, linearly and parallel to each other, thereby to datum the printhead against the nest.

The cleaning liquid is supplied to the head facing flat surface, and the dummy flat surface of the dummy block facing the head facing flat surface contacts the cleaning liquid. This causes the cleaning liquid to be spread on the head facing flat surface by the dummy flat surface. The cleaning liquid spread on the head facing flat surface is sucked through the suction holes of the suction block. The suction holes can be cleaned by the cleaning liquid passing through the suction holes according to suction. On this occasion, the ink supplied to the head facing flat surface is removed through the suction holes of the suction block. The suction holes have both a function of removing the ink from the discharge heads H and a function of removing the cleaning liquid from the head facing flat surface.

The ratio of the rotation speed Nr of the take-up roller (take-up rotation speed) and the rotation speed Nu of the feeding roller (feeding rotation speed) is used. That is, knowledge that the roll diameter Drr of the sheet S taken up on the take-up roller is given by a function using the ratio of the rotation speeds Nr and Nu as a variable was obtained. Accordingly, the roll diameter Drr is computed from this ratio.

A liquid ejecting apparatus includes a liquid ejecting head ejecting a liquid to a medium, a wiping mechanism wiping a liquid ejection surface of the liquid ejecting head and including a wiper portion that wipes the liquid ejection surface by moving in a direction along the liquid ejection surface, an electric portion including a substrate, the electronic portion being a part related to control of the apparatus, and a power supply portion as a power supply source, in which a moving direction of the wiper portion is a direction intersecting a surface of the substrate, and at least part of the electric portion and at least part of the power supply portion overlap part of the wiping mechanism in the moving direction of the wiper portion.