Eyelid heater for a continuous ink jet printer

Details Eyelid heater for a continuous ink jet printer Eyelid heater for a continuous ink jet printer

B - Operations, Transporting

41

J

B41J 2/165 (2006.01) B41J 2/175 (2006.01)

Patent

CA 2203953

Ink concentration changes in continuous ink jet printing systems have been minimized by reducing evaporation rates. This has the effect of also minimizing airflow through the catcher The reduced catcher flow is not capable of completely removing air around the jets when the eyelid is closed, so this air becomes saturated with water vapor due to localized evaporation from ink drops. This, in turn, causes the air temperature to approach the ink temperature, which is greater than the eyelid seal temperature. The saturated air condenses on the eyelid and, over time, the condensate fills the volume and drips out of the eyelid, or causes shorts to the high voltage electrode. The formation of condensate on the eyelid is eliminated by providing a heater element formed into the eyelid.

Les variations de la concentration de l'encre dans les systèmes d'impression à jet d'encre continu ont été minimisées par la réduction du taux d'évaporation de l'encre. Ceci a pour effet de minimiser également la circulation d'air dans le récupérateur. Cette réduction de la circulation d'air ne peut complètement éliminer l'air autour des jets quand le volet est fermé, de sorte que cet air devient saturé de vapeur d'eau par suite de l'évaporation localisée des gouttes d'encre. La température de l'air s'approche alors de celle de l'encre, laquelle est plus élevée que celle du joint d'étanchéité du volet. L'air saturé se condense sur le volet et, après un certain temps, le condensat rempli tout l'espace interne et dégouline du volet ou provoque un court-circuit dans l'électrode haute tension. La présente invention empêche la formation du condensat sur le volet en incorporant un élément chauffant à ce dernier.

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