Densitometer for adaptive control of ink drying time for inkjet

Incremental printing of symbolic information – Ink jet – Medium and processing means

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Details

347 37, B41J 201

Patent

active

056084390

ABSTRACT:
To prevent rubbing of the printing mechanism against still wet ink on a buckled or curled sheet of an absorbent print medium after an inkjet printer has printed one swath of a high density image, printing of the next swath is delayed as a function of the maximum density of the ink drops deposited on the print medium for the printed swath(s). The required delay in printing the next swath is dependent on print mode and preferably uses a formula with empirically derived constants to allow sufficient time for the solvent in the ink to evaporate or otherwise disperse and to permit any buckling or curling of the print medium to stabilize. In one preferred embodiment, a maximum density is calculated by counting drops of ink in each of several overlapping grids, and the magnitude and location of the maximum density grid on a prior page is also used to limit the throughput of a next page until a sufficient delay has elapsed to ensure that ink on the prior page will not be smeared when it comes into contact with the next page.

REFERENCES:
patent: 5489926 (1996-02-01), Arbeiter et al.

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