Browse Prior Art Database

Paper Weight Compensator for Cut Sheet Paper Tray

IP.com Disclosure Number: IPCOM000039374D
Original Publication Date: 1987-May-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 2 page(s) / 73K

Publishing Venue

IBM

Related People

Croll, RC: AUTHOR [+4]

Abstract

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.

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Paper Weight Compensator for Cut Sheet Paper Tray

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. Flat torsion spring 4 is inserted into platform slot 6. Therefore, loading paper rotates platform 7 and flat torsion 4 on pivot 8. Since slider 3 is rotationally fixed relative to paper tray 9, the flat spring 4 is torsionally twisted between slot 21 and rectangular slider hole 10. As the width 11 of the paper stack increases, the torsional spring length 12 decreases, thereby increasing the flat spring 4 rate. Similarly the spring rate of the flat torsion spring 4 decreases as narrow paper decreases dimension 11. The width 13 of the flat torsion spring 4 can also be curved to further compensate for the non- linear rate v...