Incremental printing of symbolic information – Ink jet – Fluid or fluid source handling means
Reexamination Certificate
1999-07-28
2003-05-27
Pham, Hai (Department: 2861)
Incremental printing of symbolic information
Ink jet
Fluid or fluid source handling means
Reexamination Certificate
active
06568802
ABSTRACT:
FIELD OF APPLICATION
The object of this invention is a damping device that would allow the ink jet printing head device to be released from the negative influences caused by positive and negative pressure forces that are due to the effect of the inertial forces of the fluid that feed the printing head, together with the vibrations arising from the operation of the drawing machine. The device is applicable to any drawing or printing machine that uses ink jet technology.
STATE OF THE ART
The raster type drawing machines that use ink jet printing heads are already well-known, but these machines (plotters) that operate with considerable printing head travelling distances, such as that described in patent ES-9701193, work under difficult speed and acceleration conditions in order to achieve high productivity rates. Normally, those movements are made up of acceleration, constant speed and deceleration stages. These speed changes produce pressure waves on the ink level subjected to the movement that produce printing head faulty operation situations. In order to reduce the mobile mass to the miminum required, the printing head is fed from an ink deposit as reservoir located in a remote location, of a size large enough to allow considerable drawing machine autonomy, being this the cause of oscillations that may be even greater than the working margin of the printing head, preventing its proper operation.
SUMMARY OF THE INVENTION
This invention refers to a damping device for pressure changes in the printing head ink feeding circuit. The device is made up of conduits fitted with branching conduits that house a gas that dampens the pressure wave, whereas the ink is displaced through the main conduit.
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patent: 6120143 (2000-09-01), Narushima et al.
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Galan D. Mario Andrada
Gonzalez Jose Ramon Perez
Coleman Sudol Sapone P.C.
Investronica Sistemas S.A.
Pham Hai
Sapone William J.
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