Method and apparatus for paper control and skew correction in a

Details Method and apparatus for paper control and skew correction in a Method and apparatus for paper control and skew correction in a

1993-12-17

1995-06-27

Bennett, Chris A.

Typewriting machines

Sheet or web

Including skew correction responsive to position of sheet or...

400624, 400630, B41J 1142

Patent

active

054274621

ABSTRACT:
A method for correcting the skew between the leading edge of a sheet of paper and the nip of a roller assembly in a printing mechanism includes the steps of advancing a sheet of paper into the nip and slightly therebeyond. The rollers are then rotated in reverse, causing the paper to retract from the roller assembly, with the angle and weight of the paper maintaining the leading edge within the nip. As the rollers continue to rotate backwards, the paper jiggles or dances allowing the leading edge to settle parallel with the nip under its own weight. The paper is then readvanced through the roller assembly with its leading edge parallel to the nip. A mechanism applies a drag force to the paper when the paper is being retracted from the roller assembly to keep the leading edge of the paper in the nip.
A single motor control apparatus includes a processor-controlled drive motor, a drive roller assembly, a pick roller assembly and a gearing arrangement coupling the drive motor to the roller assemblies, for selective control of the timing, speed and rotational direction thereof to achieve the above described method.

REFERENCES:
patent: 2366206 (1945-01-01), Metzner
patent: 4438915 (1984-03-01), Akamatsu et al.
patent: 4509734 (1985-04-01), Rutishauser
patent: 4581618 (1986-04-01), Watanabe et al.
patent: 4687362 (1987-08-01), Runzi
patent: 4721297 (1988-01-01), Katayama
patent: 4990011 (1991-02-01), Underwood et al.
patent: 5062726 (1991-11-01), Inomata et al.
patent: 5226741 (1993-07-01), Kumazaki et al.
Research Disclosure, Jul. 1990, No. 315, "Skew Correction Technique"*.
IBM Technical Disclosure Bulletin, vol. 30, No. 12, May 1988, "Bill Stacker For Bill-Handling Machine"*.

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