| 摘要 |
<p>The invention provides a cleaning method, and a cleaning unit for performing that method, in which residual toner particles are quickly and efficiently removed from the apertures or from the vicinity of the apertures by an air pressure wave generated between subsequent image formation periods. The air pressure wave is produced by pressure changing means, which provide a temporary air pressure difference in the gap between the printhead structure and the image receiving medium. The air pressure wave has an amplitude, a rise time and a fall time dimensioned to release toner agglomerated within or around the apertures. The pressure wave is preferably produces by a vibrating element, for example a speaker membrane, arranged in conjunction with a nozzle disposed in the vicinity of the apertures.</p> |
