Cassette tray assembly for feeding sheets of different basis wei

Details Cassette tray assembly for feeding sheets of different basis wei Cassette tray assembly for feeding sheets of different basis wei

1997-11-14

1998-09-29

Smith, Matthew S.

Electrophotography

Document handling

Copy

271160, 271171, G03G 1500

Patent

active

058157875

ABSTRACT:
A sheet stacking and lifting cassette tray assembly for reliably and effectively feeding sheets of different basis weight for use in a reproduction machine. The sheet stacking and lifting cassette tray assembly includes a cassette frame including a frame floor, and frame side walls; a plurality of sheet stacking and lifting subassemblies mounted within, and to, the frame side walls for applying selectable values of sheet lifting normal forces against a sheet feedhead. Each sheet stacking and lifting subassembly of the plurality of sheet stacking and lifting subassemblies includes a pivotable stacking and supporting plate, and a set of springs having a spring rate for providing a normal force having a particular value for lifting a stack of sheets. The sheet stacking and lifting cassette tray assembly also includes a selecting device for engaging a first number of the plurality of sheet stacking and lifting subassemblies so as to prevent the first number of the plurality of sheet stacking and lifting subassemblies from applying a normal force for lifting, thus varying a number of the sheet stacking and lifting subassemblies applying a normal force to a stack of sheets of a given basis weight, and thereby enabling reliable and effective feeding of sheets from such stack without sheet feeding miscues.

REFERENCES:
patent: 4786042 (1988-11-01), Stemmle
patent: 5085421 (1992-02-01), Sellers
patent: 5338021 (1994-08-01), Shirai
patent: 5419544 (1995-05-01), Ono et al.
patent: 5632477 (1997-05-01), Morinaga
patent: 5752696 (1998-05-01), Nakatani et al.
patent: 5758250 (1998-05-01), Miki

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