Provided is a jetting driver that can be used for various types of heads with minimal changes. The jetting driver includes: an image board receiving raw image data and generating image data by transforming the raw image data into a form suitable for a type of heads used; and an interface board physically separated from the image board, receiving the image data, and transmitting the image data to the heads through a plurality of channels.

In one example in accordance with the present disclosure, a method, system, and non-transitory machine-readable storage medium are described. A drop characteristic measurement of a drop of print fluid ejected from a printhead is detected. The drop characteristic measurement includes at least one of a drop velocity and a drop weight. The drop characteristic measurement is compared against a threshold value. When the drop characteristic measurement is beyond the threshold value, a remedial action is triggered.

A continuous inkjet printer (5) having a printhead (7) that includes first and second ink droplet generators (8, 9), each operable to generate a stream (10) of ink droplets, and a common gutter (11) arranged to receive unprinted ink droplets from the first and second ink droplet generators (8, 9), the printer (5) further including control means configured to determine receipt into the common gutter (11) of ink droplets from the first and second ink droplet generators (8, 9), wherein the control means are operable to use a single sensor (17) to determine receipt into the common gutter (11) of ink droplets from one, both, or neither of the first and second ink droplet generators (8, 9).

A continuous inkjet printer (5) having a printhead (7) that includes first and second ink droplet generators (8, 9), each operable to generate a stream (10) of ink droplets, and a common gutter (11) arranged to receive unprinted ink droplets from the first and second ink droplet generators (8, 9), the printer (5) further including control means configured to determine receipt into the common gutter (11) of ink droplets from the first and second ink droplet generators (8, 9), wherein the control means are operable to use a single sensor (17) to determine receipt into the common gutter (11) of ink droplets from one, both, or neither of the first and second ink droplet generators (8, 9).

Examples include a fluid ejection device. The fluid ejection device comprises a fluid ejection die and a control engine. The fluid ejection die comprises nozzles to eject fluid drops and a temperature sensors disposed on the die to sense temperatures associated with nozzles. The control engine determines at least one nozzle characteristic of at least one respective nozzle based at least in part on a temperature change associated with the at least one respective nozzle corresponding to at least one ejection event.

Examples include a fluid ejection device. The fluid ejection device comprises a fluid ejection die and a control engine. The fluid ejection die comprises nozzles to eject fluid drops and a temperature sensors disposed on the die to sense temperatures associated with nozzles. The control engine determines at least one nozzle characteristic of at least one respective nozzle based at least in part on a temperature change associated with the at least one respective nozzle corresponding to at least one ejection event.

An inkjet recording apparatus includes a conveying portion, a recording portion including a line head including a plurality of recording heads, a temperature detecting portion, a cooling mechanism, and a control portion. The cooling mechanism includes a storing portion that stores cooling liquid, a circulation path of the cooling liquid that is arranged to be branched into a plurality of branch paths passing near the recording heads, a heat dissipating portion that dissipates heat of the cooling liquid, and a pump that causes the cooling liquid to circulate. If there exists, among the recording heads, a recording head that is predicted to undergo a temperature rise, the control portion increases a flow amount or circulation time of the cooling liquid in whichever of the branch paths serves as a flow path of the cooling liquid flowing toward the recording head that is predicted to undergo a temperature rise.

An inkjet recording apparatus includes a conveying portion, a recording portion including a line head including a plurality of recording heads, a temperature detecting portion, a cooling mechanism, and a control portion. The cooling mechanism includes a storing portion that stores cooling liquid, a circulation path of the cooling liquid that is arranged to be branched into a plurality of branch paths passing near the recording heads, a heat dissipating portion that dissipates heat of the cooling liquid, and a pump that causes the cooling liquid to circulate. If there exists, among the recording heads, a recording head that is predicted to undergo a temperature rise, the control portion increases a flow amount or circulation time of the cooling liquid in whichever of the branch paths serves as a flow path of the cooling liquid flowing toward the recording head that is predicted to undergo a temperature rise.

The current at a deflection electrode 23, 25 of an electrostatic deflection continuous inkjet printer 127 is monitored. If the current reaches a level higher than normal for a clean print head but below the current required to trigger an automatic shutdown, a warning is generated. The warning indicates that an automatic shutdown is likely to follow unless the print head is cleaned. This allows the operator to shut the printer down in a planned manner for cleaning. The warning may be provided at the printer 127 or it may be provided by an external system 121, 129 which allows personnel who are not at the printer to be alerted. The monitoring may be done by the printer or information about the deflection electrode current may be provided to an external system 121, 129 that performs the monitoring.

The current at a deflection electrode 23, 25 of an electrostatic deflection continuous inkjet printer 127 is monitored. If the current reaches a level higher than normal for a clean print head but below the current required to trigger an automatic shutdown, a warning is generated. The warning indicates that an automatic shutdown is likely to follow unless the print head is cleaned. This allows the operator to shut the printer down in a planned manner for cleaning. The warning may be provided at the printer 127 or it may be provided by an external system 121, 129 which allows personnel who are not at the printer to be alerted. The monitoring may be done by the printer or information about the deflection electrode current may be provided to an external system 121, 129 that performs the monitoring.