Device for adjusting the air system pressures, the stack height and the lead edge gap in a high capacity feeder

摘要

A feed apparatus in which varying air pressures in combination with tray angling and height adjustment reduces the variability in key feeder performance characteristics such as "sheet acquisition times" and "sheet separation". The setting of positive and negative air pressures in the paper feeder based on specific paper/media characteristics sheet basis weight, size, coating configuration, curl direction and magnitude.is performed. As a result of this reduced variability, the feeder's performance (as measured by misfeeds, late feeds and multifeeds) is inherently better than designs not incorporating this concept. This concept also reduces the need for operator interventions (flipping, rotating and/or replacing paper) for feeder performance problems that are the direct result of differing paper properties (sizes ,weights & coatings) and normal variations in sheet curl from ream to ream, or from paper to paper. <IMAGE>