The electrohydrodynamic print head includes a nozzle layer with a plurality of nozzles A feed layer is arranged above nozzle layer. It contains feed ducts for feeding ink to the nozzles as well as electrically conducting feed lines for feeding voltages to electrodes at nozzles. The feed layer includes one or more dielectric sublayers, which is/are structured to form the feed ducts and feed lines. Some of the sublayers contain vertical via sections and others contain horizontal interconnect sections. The feed layer is structured for customizing the print head easily.

The electrohydrodynamic print head includes a nozzle layer with a plurality of nozzles A feed layer is arranged above nozzle layer. It contains feed ducts for feeding ink to the nozzles as well as electrically conducting feed lines for feeding voltages to electrodes at nozzles. The feed layer includes one or more dielectric sublayers, which is/are structured to form the feed ducts and feed lines. Some of the sublayers contain vertical via sections and others contain horizontal interconnect sections. The feed layer is structured for customizing the print head easily.

A droplet ejection device includes a processor; and a memory device configured to store a program, the program executed by the processor to cause the processor to: acquire information of a droplet ejection unit including a plurality of nozzles, the plurality of nozzles moving in a first direction toward an object and ejecting a droplet; and set ejection conditions of the droplet in each of the plurality of nozzles based on the acquired information of the droplet ejection unit. The droplet ejection device further may include an inspection unit configured to inspect the nozzle. The information of the nozzle may include information of a shape in a tip of the nozzle. It is possible to eject a droplet in a stable and consistent manner at a predetermined position by using one embodiment of the present disclosure.

A liquid droplet ejection device includes a first liquid droplet ejection unit including a first liquid holding unit configured to hold a first liquid and a first tip configured to eject a first liquid of the first liquid holding unit as a first liquid droplet, a second liquid droplet ejection unit including a second liquid holding unit configured to hold a second liquid and a second configured tip to eject the second liquid of the second liquid holding unit as a second liquid droplet differing from the first liquid droplet, an object holding unit configured to hold an object the first liquid and the second liquid being ejected to the object, and a driving unit configured to move the first tip and the second tip in a first direction relative to the object holding unit, and the first tip is arranged in the first direction relative to the second tip.

A three-dimensional (3D) metal object manufacturing apparatus is equipped with a removable vessel to reduce the time required for start-up procedures after the printer is serviced. The removable vessel is filled with solid metal that is heated to its melting temperature before the bulk wire is inserted into the vessel to commence printing operations. The melting of the solid metal in the removable vessel requires less time that the melting of an length of bulk wire adequate to produce a volume of melted metal suitable for printer operation. The solid metal in the removable vessel can be metal pellets, metal powder, or a solid metal insert.

The present disclosure relates to an induced electrohydrodynamic jet printing apparatus including an induced auxiliary electrode, and the induced electrohydrodynamic jet printing apparatus including an induced auxiliary electrode according to the present disclosure includes a nozzle for discharging supplied solution towards an opposite substrate through a nozzle hole formed at one end; a main electrode coated with an insulator and interpolated inside the nozzle, thus not contacting the solution inside the nozzle but separated from the solution; the induced auxiliary electrode made of a conductive material and formed at an outer surface of the nozzle; and a voltage supply for applying voltage to the main electrode.

The disclosure relates to an application device for applying an application medium onto a component, preferably for application of a coating onto a motor vehicle body component. The application device includes a print head for preferably serial and/or permanent application of the application medium, wherein the print head has: a nozzle plate, at least one nozzle in the nozzle plate in order to discharge the application medium, at least one valve element, which is movable relative to the nozzle plate, for control of the application medium discharge through the at least one nozzle, wherein the at least one movable valve element closes the at least one nozzle in a closing position and releases it in an opening position, and at least one drive for moving the at least one valve element. The application device is characterised in particular in that it includes at least one temperature control apparatus for reducing heating of the at least one drive during application of the application medium.

The disclosure relates to an application device for applying an application medium onto a component, preferably for application of a coating onto a motor vehicle body component. The application device includes a print head for preferably serial and/or permanent application of the application medium, wherein the print head has: a nozzle plate, at least one nozzle in the nozzle plate in order to discharge the application medium, at least one valve element, which is movable relative to the nozzle plate, for control of the application medium discharge through the at least one nozzle, wherein the at least one movable valve element closes the at least one nozzle in a closing position and releases it in an opening position, and at least one drive for moving the at least one valve element. The application device is characterised in particular in that it includes at least one temperature control apparatus for reducing heating of the at least one drive during application of the application medium.

Provided is a liquid ejecting device. An alternating current electric field generation unit includes a first electrode and a second electrode disposed adjacent to each other, a high-frequency voltage generation unit configured to generate a high-frequency voltage to the first electrode and the second electrode, and a conductor configured to electrically couple the first electrode and the second electrode to the high-frequency voltage generation unit. Based on a result detected by a detection unit configured to detect a change in an alternating current electric field generated from the alternating current electric field generation unit, a control unit is configured to stop generation of the high-frequency voltage from the high-frequency voltage generation unit to the first electrode and the second electrode.

Provided is a liquid ejecting device. An alternating current electric field generation unit includes a first electrode and a second electrode disposed adjacent to each other, a high-frequency voltage generation unit configured to generate a high-frequency voltage to the first electrode and the second electrode, and a conductor configured to electrically couple the first electrode and the second electrode to the high-frequency voltage generation unit. Based on a result detected by a detection unit configured to detect a change in an alternating current electric field generated from the alternating current electric field generation unit, a control unit is configured to stop generation of the high-frequency voltage from the high-frequency voltage generation unit to the first electrode and the second electrode.