INK JET PRINTING

摘要

A continuous ink jet printer comprises a gutter for collecting ink droplets not used in printing. Pumping apparatus draws ink from the gutter and control apparatus is configured to vary the level of pumping by the pumping apparatus depending on the temperature or other parameter of the ink. As the temperature of the ink increases the level of pumping is reduced. The pumping apparatus may comprise two venturi pumps connected in parallel each having its throat connected to the gutter.