An improved dot matrix actuator is provided which includes a magnetic circuit formed of a yoke assembly and a pivotal armature. The armature is pivotally supported with respect to the yoke by means of a flexure assembly which eliminates the need for a true pivot between the two elements. The elements are shaped so as to maintain a constant small air gap therebetween so as to maximize the magnetic efficiency of the device while eliminating wear. The device is operated just below saturation of the...

A continuous stream type ink jet printhead utilizing constant thermal pulses to perturbate the ink streams emitted through a plurality of nozzles to break up the ink streams into droplets at a fixed distance from the nozzles whereat the drops are individually charged by a charging electrode in accordance with digitized data signals. Each printhead has a manifold, a plurality of ink channels communicating at one end with the manifold and terminating at the other end with nozzles, and at least one...

An improved thermal ink jet printhead is disclosed for ejecting and propelling ink droplets on demand along a flight path toward a recording medium spaced therefrom in response to receipt of electrical input signals representing digitized data signals. Each printhead has one or more capillary filled ink channels. The channels have a droplet emitting nozzle on one end and connect to an ink supplying manifold on the other end. Each channel has a heating element upstream from the nozzle that is loc...

A multicolor ink jet printhead for use in a continuous stream ink jet printing system is disclosed. Each ink emitting nozzle is supplied from a separate ink reservoir under a predetermined pressure to an associated inlet in a common droplet generator. A means of passage is provided from the inlet of the droplet generator to a respective nozzle through a medium in the droplet generator resonance cavity. The passage means maintaining the separation of the various colored inks from the cavity mediu...

In a liquid jet recording apparatus provided with a recording head for discharging recording liquid as flying liquid droplets, a head mounting portion for fixing the recording head, and liquid supply means for supplying the recording liquid to the recording head, the recording head and the head mounting portion are removably mounted by fixing means and the liquid supply means is removably connected to the recording head by coupling means.

Writing device with heating elements for printing by thermal action on a ting support, mounted on a base and comprising a heating elements support bearing the heating elements and first electrical contacts connected directly to said heating elements, an intermediate support to support mechanically and removably the support, a connecting part provided with second electrical contacts adapted to cooperate with the first contacts of the support and attached respectively to the base. A fixing device ...

The head (12) comprises a closed container (14) carrying two electrodes (36, 62) and a nozzle (18) and mounted removably on a carriage (13). In order for the ink (16) always to be held at atmospheric pressure, the container (14) comprises an expansible space defined by a diaphragm (67) having a portion (74) aligned with an opening (73) in the container (14). The diaphragm (67) is of butyl rubber which can be pierced with a syringe to permit the container (14) to be refilled with ink (18). The co...

An improved dot matrix actuator is provided which includes a magnetic circuit formed of a yoke assembly and a pivotal armature. The armature is pivotally supported with respect to the yoke by means of a flexure assembly which eliminates the need for a true pivot between the two elements. The elements are shaped so as to maintain a constant small air gap therebetween so as to maximize the magnetic efficiency of the device while eliminating wear. The device is operated just below saturation of the...

A printhead assembly is provided comprising at least one printhead module comprising a unitary arrangement of a support member, at least two printhead integrated circuits, each of which has nozzles formed therein for delivering printing fluid onto the surface of print media, at least one fluid distribution member mounting the printhead integrated circuits to the support member, and an electrical connector for connecting electrical signals to the printhead integrated circuits, and a casing in whi...

A printhead for a light emitting diode printer has a transparent substrate with a row of LED dice mounted on the substrate with their light emitting junctions adjacent to the substrate so as to emit light through the substrate. Each die has a row of LEDs along its length and a row of connection pads at known locations for making electrical connection to the LED anodes. Metal lines are deposited on the transparent substrate at known locations. Solder bumps between the connection pads and metal li...