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Paper Weight Compensator for Cut Sheet Paper Tray Disclosure Number: IPCOM000039374D
Original Publication Date: 1987-May-01
Included in the Prior Art Database: 2005-Feb-01

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Croll, RC Purcell, BD Thornhill, WJ Whitehead, VE [+details]


The figure illustrates a paper weight compensator in which paper weight changes caused by the width and number of sheets of loaded paper do not change the drive roller normal force, thereby producing a more reliable paper separator. As shown in the figure, cut sheet paper 1 loaded in paper tray 2 may be fed either lengthwise or sideways. Since the paper platform 7 must provide a constant normal force against drive roller 20 during the paper feed cycle, the paper stack 1 weight must be nullified and a precise drive roller force applied to buckle and transport the paper. These are accomplished by flat spring 4 which compensates for any paper weight and spring 14 which provides the buckle and transport force. Slider 3 moves left to right on flat torsion spring 4 to position paper against tray edge 6.