| 摘要 |
<p>In an ink jet printing system wherein a drop generator emits ink droplets for printing on a recording medium, deleterious ink mist or ink dust formed as a result of ink droplets impacting on the medium is collected by collecting means disposed adjacent the zone at which the ink droplets contact the medium and airborne contamination, to components such as the drop generator, charge electrodes and deflection electrodes, are prevented by encasing the components in a pressurized container.</p><p>In the Figure the print head 22 comprising drop generator 26, nozzle plate 28, charge electrode 31 and deflection plates 34, 36 are enclosed in container 40. The pressure in container 40 is maintained above atmosphereic via inlet 46, 48 from a pressure source. Ink droplets exitfrom the container 40 through aperture 50.</p><p>A fog scoop 42 is mounted on the container and is connected to a low pressure suction source via outlet 86. A second outlet 92, 94 is connected to cavity 84 through a porous filter 90 and, in use, ink mist is condensed on the filter and re-circulated via outlet 92, 94.</p> |
