Recorders – Markers and/or driving means therefor – With ink supply to marker
Patent
1986-07-21
1988-04-12
Hartary, Joseph W.
Recorders
Markers and/or driving means therefor
With ink supply to marker
25112915, 251359, 346 75, 417413, G01D 1516
Patent
active
047378026
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a fluid jet printing device.
Fluid jet printing devices having an inlet which is connected to a source for feeding ink or another printing fluid to the device, further comprising an outlet formed by a nozzle for forming drops and a valve located between the inlet and the outlet are commonly known in the art and commercially available as so-called ink jet printers. Printers of this kind or a similar kind are known from the following references which are cited as a technical background with respect to the present invention: EP-A 83 877, FR-A 23 38 089, GB-A 20 03 429, DE-A 29 05 063 and FR-A 24 98 988. Fluid jet printing devices of the kind mentioned above include a solenoid valve having a coil and a movable actuation member or body cooperating with a valve seat, said valve seat being located between the inlet and the outlet. The valve seat of prior art fluid jet printing devices is formed as a part of the valve housing located opposite to the actuation member.
As known per se in the art, characters are generated by fluid jet printers by ejecting a plurality of fluid drops for forming dots which together define the desired character. The fluid drops are generated by a number of jet nozzles of a number of fluid jet printing devices forming together a fluid printer. The jet nozzles are arranged in a side-by-side fashion. The nozzles are supplied from a common source for feeding fluid having a predetermined pressure over a plurality of solenoid valves, one for each nozzle, said valves being controlled by a programmable character generator which is connected to each of said solenoid valves. For complying with today's requirements concerning fluid jet printers, high actuation frequencies or drop generation rates are necessary. In case of generating characters by fluid jet printing devices forming drops having a diameter of 0.2 mm on the paper or registration medium, seven fluid jet nozzles are required in a side-by-side arrangement for forming a character height of approximately 1.5 mm. In case of a speed of the registration medium, e.g. the paper which is moved past the printing nozzles, of two meters per second, the necessary valve control frequency must be in the range of 2 kHz when accepting a dot size of approximately 1 mm. When considering these figures, it will be clear that a high drop-forming frequency is of utmost importance for high speed/high quality-printers. None of the prior art fluid jet printing devices fulfil the requirements as indicated above.
In view of this state of art, the present invention is based on the technical task of how to provide a fluid jet printing device having an increased drop-generation frequency.
This technical task is solved by a fluid jet printing device of the above-mentioned type having a diaphragm-like partition wall separating the inlet from the outlet and including the valve seat.
The flexible-diaphragm-like partition wall is bent when actuating the movable actuation member of the valve. The bending of the flexible diaphragm-like partition wall can be caused by the physical contact between the movable actuation member at the very moment of closing the valve seat or can alternatively be caused by a pressure-wave generated by the actuation member and bending the partition wall located opposite thereto without necessarily requiring any physical contact between the actuation member and the diaphragm-like partition wall. The bending of the diaphragm-like partition wall towards the outlet of the valve results in a pressure-peak shortly before or at the very moment of closing of the valve. The pulse-like increasing of the pressure of the fluid at the outlet side of the valve assists and promotes the generation of drops by the jet nozzle, these drops do not have any tendency of flowing together during their flight towards the paper or registration medium.
Advantageous embodiments of the fluid jet printing device in accordance with the present invention as well as a printer comprising a plurality of these printing devices are defined in the su
REFERENCES:
patent: 4199767 (1980-04-01), Campbell
patent: 4378564 (1983-03-01), Cross
Hartary Joseph W.
Swedot System AB
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