Low airflow catcher for continuous ink jet printers

B - Operations – Transporting – 41 – J

Patent

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B41J 2/18 (2006.01) B41J 2/185 (2006.01)

Patent

CA 2203957

An improved catcher device is provided for use with a continuous ink jet printer of the kind for generating a row of parallel selectively charged drop streams catches charged ink drops. The improved catcher device includes a catcher face for receiving selectively charged drops of ink. A catcher radius associated with the catcher face directs the flow of selectively charged drops of ink from the catcher face into a catcher throat. The catcher throat is associated with the catcher radius and accepts a flow of selectively charged drops of ink from the catcher radius. The catcher throat has a short, narrow gap with a sudden enlargement downstream of the gap and two converging-diverging channels formed by an elliptical island and elliptical sidewalls. Finally, a catcher vacuum port, comprising the catcher face, the catcher radius, and the catcher throat, establishes reduced airflow and returns the selectively charged drops of ink from the printhead to the fluid system.

L'invention est un récupérateur amélioré pour imprimante à jet d'encre continu du type produisant une rangée de chaînes de gouttelettes parallèle électrisées sélectivement. Le récupérateur de l'invention comporte une face de réception de gouttelettes d'encre électrisées sélectivement. Une ouverture circulaire associée à la face de récupération dirige la circulation des gouttelettes d'encre électrisées dans un goulot. Le goulot du récupérateur est associé à l'ouverture circulaire de ce dernier et reçoit un flot de gouttelettes d'encre électrisées. Le goulot a un court espacement qui est suivi d'un brusque évasement et de deux canaux convergents-divergents formés par un îlot elliptique et des parois elliptiques. Finalement, un port d'évacuation constitué de la face, de l'ouverture et du goulot du récupérateur réduit la circulation d'air et renvoie au système de distribution de fluide les gouttelettes d'encre provenant de la tête d'impression.

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