Ink jet printer dot placement compensation method

Details Ink jet printer dot placement compensation method Ink jet printer dot placement compensation method

1992-04-16

1994-09-20

Fuller, Benjamin R.

Incremental printing of symbolic information

Ink jet

Ejector mechanism

400279, 347 16, B41J 207

Patent

active

053493753

ABSTRACT:
In a printer having P+X printing elements for printing pixels with a vertical center-to-center spacing R.sub.1 during a plurality of line scans, and a stepper motor for moving a record medium in increments R.sub.2 where R.sub.2 is greater than R.sub.1, all points addressable printing is obtained by a combination of movement of the record medium orthogonal to the line scan direction and shifting address signals applied to the print elements. The stepper motor moves the record medium a distance k.sub.2 R.sub.2 between successive line scans and address signals are applied to (n+k.sub.1)th . . . (n+k.sub.1 +P-1)th print elements to cause a shift k.sub.1 R.sub.1 such that the sum of the distance the record medium is moved before a line scan and the shift caused by the address signals during a scan is equal to PR.sub.1 where P is the number of print elements active during the preceding line scan, or equal to any desired integral multiple of R.sub.1 in other print modes. With a print head capable of printing pixels on 1/300 inch centers, and a stepper motor capable of moving the record medium in minimum increments of 1/150 inch, all points addressable printing with a pixel resolution of 1/300 inch is achieved with increased accuracy. This same arrangement also permits printing in the character mode with a line-to-line spacing of exactly 1/6 inch. In a second embodiment the line-to-line spacing differs from 1/2 inch by a distance that has minimal impact on print quality.

REFERENCES:
patent: 4033444 (1977-07-01), Beery
patent: 4737041 (1988-04-01), Nakayama
patent: 4953995 (1990-09-01), Sims et al.
patent: 4972270 (1990-11-01), Kurtin et al.
patent: 5070345 (1991-12-01), Lahut et al.
IBM Technical Disclosure Bulletin, vol. 31, No. 4, Sep. 1988, pp. 360-364.

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