Printing sheet feed and aligning system for a printer

Details Printing sheet feed and aligning system for a printer Printing sheet feed and aligning system for a printer

1991-03-19

1992-02-18

Burr, Edgar S.

Typewriting machines

Sheet or web

Including aligning of sheet edge prior to typing

400579, 400 56, B41J 1326

Patent

active

050888480

ABSTRACT:
Two rollers with lobes for feeding a sheet are disposed below the plane feed surface. The two rollers are rotatable on axes perpendicular to one another and move the sheet or the document to be printed in a direction perpendicular and parallel, respectively, to the printing direction of the head to align the sheet against retractable stop elements movable parallel to the printing direction and against a lateral guide perpendicular to the printing direction. Suitable optical sensors detect a possible misalignment of the sheet and cause a further rotation of the rollers to complete the alignment of the sheet against the guides; in case a document such as an accounting book is to be fed, a testing device detects the thickness of the document for positioning the head at a prefixed distance from the printing surface of the document itself.

REFERENCES:
patent: 3430947 (1969-03-01), Davis
patent: 4023662 (1977-05-01), Perucca
patent: 4174908 (1979-11-01), Wehler
patent: 4420269 (1983-12-01), Ackermann et al.
patent: 4897670 (1990-01-01), Hasegawa et al.
patent: 4909374 (1990-03-01), Skrypalle
patent: 4989855 (1991-02-01), Polic
IBM Tech. Disclosure Bulletin, vol. 32, No. 6B, 11/89, Barrel Roll for Document Alignment.
IBM Tech. Disclosure Bulletin, vol. 29; No. 7, 12/86, Dual Direction, Varying Force Sheet Aligner.

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