Method and apparatus for scanning a receiving medium

Details Method and apparatus for scanning a receiving medium Method and apparatus for scanning a receiving medium

1991-07-01

1994-03-01

Fuller, Benjamin R.

Recorders

Performance of multiple functions of steam and gas engines

Pressure responsive element

346139D, B41J 2500

Patent

active

052912140

ABSTRACT:
A method and apparatus are disclosed for scanning a receiving medium. The apparatus comprises a motor-driven lead screw which is used to advance a print head relative to a receiving medium supported on a rotatable drum. In order to overcome the problem of banding in an image produced by the apparatus as a result of a sinusoidal pitch error of the lead screw, the pitch error of the lead screw is broken up into a random pitch error. In another embodiment, the pitch error frequency is shifted to a higher frequency which is less sensitive to the human eye.

REFERENCES:
patent: 4468706 (1984-08-01), Cahill
patent: 4724366 (1988-02-01), Neesz
patent: 4772582 (1988-09-01), DeBoer
patent: 4924321 (1990-05-01), Miyagawa et al.
patent: 4985779 (1991-01-01), Gall

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