Sheet feeding or delivering – Feeding – Separators
Patent
1990-02-14
1992-04-14
Skaggs, H. Grant
Sheet feeding or delivering
Feeding
Separators
221227, 4147967, 4147973, 414924, 271119, 271126, 271144, 271171, 271153, 271155, B65H 708
Patent
active
051041111
ABSTRACT:
A sheet feed arrangement is provided in an image forming apparatus such as a printer or the like and is comprised of a sheet cassette for accommodating a plurality of sheet materials, a lifting mechanism disposed below the sheet cassette for lifting end portions of the sheet materials only when the sheet materials are fed from the sheet cassette, a level detector disposed above the sheet cassette for detecting that an upper end surface of a topmost sheet material has been lifted up to a predetermined level, and a control system for stopping an upward movement of the sheet materials when the level detector detects that the upper end surface of the topmost sheet material has reached the predetermined level and for subsequently lowering the end portions of the sheet materials by a predetermined vertical length.
REFERENCES:
patent: 3655183 (1972-04-01), Wagner
patent: 3741537 (1973-06-01), Lange
patent: 3768805 (1973-10-01), Kuksa
patent: 4307878 (1981-12-01), Kono
patent: 4319740 (1982-03-01), Ulseth
patent: 4488718 (1984-12-01), Tamura
patent: 4508332 (1985-04-01), Nishio
patent: 4750020 (1988-06-01), Ishizu et al.
patent: 4925177 (1990-05-01), Nakamura et al.
J. L. Campbell and W. J. Wipke, Paper Stack Height Sensing Apparatus, May 1975, IBM Technical Disclosure Bulletin, vol. 17, No. 12, pp. 3623-3624.
J. L. Fallon and E. P. Kollar, Sheet Feeding Apparatus, Dec. 1976, IBM Technical Disclosure Bulletin, vol. 19, No. 7, p. 2440-2441.
Drazbick Carol Lynn
Minolta Camera Kabushiki Kaisha
Skaggs H. Grant
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