Printing method and apparatus using serial print head

Details Printing method and apparatus using serial print head Printing method and apparatus using serial print head

1996-02-23

1998-06-16

Berhane, Adolf

Incremental printing of symbolic information

Ink jet

Ejector mechanism

B41J 2938

Patent

active

057678758

ABSTRACT:
In a serial type printing apparatus which forms an image with a given dot pitch (P.sub.D) in the sheet feed direction, a print head is provided which includes a plurality (n) of dot marking parts arranged with an arrangement pitch (P.sub.N =M.sub.N P.sub.D) that is the dot pitch multiplied by an integer number (m.sub.N). After termination of one print scanning step by the print head, a sheet is fed with sheet feed pitches (P.sub.F1, P.sub.F2) that are larger than the arrangement pitch P.sub.N but smaller than a width ((n-1)P.sub.N) across which the plurality of dot marking parts are arranged, thus width also being the dot pitch multiplied by an integer number. According to such a printing method, the sheet feed can be equalized to suppress banding appearing as a seam extending in the scanning direction at the boundary between the adjacent printed areas due to the precision of a sheet feed mechanism.

REFERENCES:
patent: 4734868 (1988-03-01), DeLacy
patent: 5633663 (1997-05-01), Matsubara et al.

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