In one example, an apparatus is described, which includes a platen locating the print medium, at least one printhead for marking on the print medium, a carriage holding the at least one printhead, a sensor at least partially mounted to the carriage to measure a printhead-to-platen spacing (PPS) along scanning axis during scanning, and an integrated circuit including a dynamic compensation module and a PPS analysis module to delay firing of printing fluid drops from the at least one printhead to compensate platen defects based on the measured PPS.

The present disclosure relates to a printhead control system for a printer, wherein the printer includes at least one printhead comprising a plurality of nozzles for ejecting printing fluid, wherein the nozzles include high drop weight nozzles and low drop weight nozzles ejecting drops of different drop weight, and are each arranged to eject printing fluid on a print medium such as to print images in frame areas of the print medium and such as to clean nozzles in spit bar areas of the print medium; the printer further includes a transport unit for moving the print medium relative to the printhead, wherein the print medium includes frame areas for printing images and spit bar areas for cleaning the nozzles; the printhead control device including: a module to determine a first group of said nozzles located over a frame area of the print medium and a second group of said nozzles located over a spit bar area of the print medium; a module to operate the high drop weight nozzles of the first group such as to eject printing fluid and print an image in the frame area; a module to operate disable the low drop weight nozzles of the first group such as to not eject printing fluid in the frame area; and a module to operate the high drop weight nozzles and the low drop weight nozzles of the second group such as to alternately eject printing fluid in the spit bar area.

One example provides a printhead including a plurality of printhead dies, each printhead die including at least one crack sense resistor. At least one analog bus is connected to each printhead die, the at least one analog bus to output voltages to facilitate a printer controller to determine whether at least one of the printhead dies is cracked.

A printing apparatus includes a liquid discharge device, a carriage, and a controller. The liquid discharge device includes a first nozzle row to discharge a first liquid to form an image and a second nozzle row to discharge a second liquid of a type different from the first liquid. The carriage is mounted with the liquid discharge device and reciprocally movable in a main scanning direction. The controller is configured to control the liquid discharge device to discharge the second liquid onto a region of a medium including another region onto which the first liquid is discharged. The controller includes a control unit to control the liquid discharge device to discharge the second liquid from the second nozzle row in both of forward movement and backward movement of the carriage and discharge the first liquid from the first nozzle row in one of the forward movement and the backward movement.

A printing apparatus includes: a print head that includes a plurality of nozzles ejecting an ink and performs printing on a print target; and at least one processor that controls an ejection operation of the print head based on ejection specification data defining ejection of the ink. At least a “first mode” and a “second mode” are provided with respect to the application of the ejection specification data, and the processor switches between the “first mode” and the “second mode” based on a set printing density.

Inkjet printing equipment capable of measuring a droplet includes a process stage providing a processing space for a process substrate, a pair of guide members disposed on opposite sides of the process stage, a head unit discharging a droplet onto the process substrate, a first gripper moving along the pair of guide members and gripping a side portion of the process substrate, a second gripper configured to move along the guide members and gripping a measurement substrate onto which a droplet is discharged in order to inspect the head unit, and a droplet inspection unit inspecting a discharge state of the droplet discharged onto the measurement substrate and outputting information of whether the discharge state of the droplet is normal or abnormal.

A printhead maintenance system includes: an elongate inkjet printhead having a nozzle face containing a plurality of inkjet nozzles; a carriage movable longitudinally along the printhead in a cleaning direction, the carriage including a maintenance member having: a fluid bath having a mouth opposing the nozzle face of the printhead, a primary fluid inlet at an upstream end of the fluid bath relative to the cleaning direction and a fluid outlet at a downstream end of the fluid bath relative to the cleaning direction; and a traversing mechanism for traversing the carriage longitudinally along the printhead in the cleaning direction. The maintenance member does not contact inkjet nozzles of the printhead, and the fluid bath is configured to provide a greater fluid velocity at the downstream end relative to the upstream end.

A printing device is configured to be used simultaneously with other printing devices and includes: a print unit configured to print by ejecting ink from nozzles; a timekeeping unit configured to keep time; a storage configured to store a reference period for executing a nozzle maintenance operation, the reference period being initially set at an initial reference period; and a maintenance processor configured to: execute a nozzle maintenance operation each time the reference period passes based on the time kept by the timekeeping unit, change the reference period stored in the storage from the initial reference period to a changed reference period such that a timing of the nozzle maintenance operation differs from a timing of the nozzle maintenance operation of at least one of the other printing devices, and execute the nozzle maintenance operation after the changed reference period passes.

A logic circuitry package for a replaceable print apparatus component includes an interface to communicate with a print apparatus logic circuit, and at least one logic circuit to transmit, via the interface, a sensor ID parameter and a limit parameter, the sensor ID parameter indicating a first sensor ID. The logic circuit is to receive, via the interface, a first request corresponding to the first sensor ID with the component connected to the apparatus and the apparatus not pneumatically actuating the component. The logic circuit is to transmit, via the interface, a first digital value in response to the first request. The logic circuit is to receive, via the interface, a second request corresponding to the first sensor ID with the component connected to the apparatus and the apparatus pneumatically actuating the component. The logic circuit is to transmit, via the interface, a second digital value in response to the second request. A difference between the first digital value and the second digital value is greater than the limit parameter.

There is provided an image recording apparatus including: a conveyor, a recording head, a carriage and a controller. In a case that the controller causes a not less than two copies of a same image to be recorded, at a time of recording of a first copy of the not less than two copies, the controller generates first discharge data, obtains blank information, and performs the recording of the first copy by a multi pass recording based on the first discharge data, regardless of the blank information. At a time of recording of a second copy of the not less than two copies, the controller generates second discharge data and performs the recording of the second copy by at least one of a single pass recording and the multi pass recording, based on the second discharge data.