Incremental printing of symbolic information – Ink jet – Ejector mechanism
Reexamination Certificate
2007-02-13
2007-02-13
Patel, Vip (Department: 2861)
Incremental printing of symbolic information
Ink jet
Ejector mechanism
C347S019000, C347S022000
Reexamination Certificate
active
10670189
ABSTRACT:
An example conventional method of avoiding a printing failure caused by residual bubbles in a print head involves counting from an initiation of a printing operation the accumulated number of print dots formed by the entire print head and, when the count value reaches a predetermined value, executing a recovery operation. Such a conventional method, however, requires the recovery operation to be performed frequently by selecting a threshold value for the worst condition. To solve this problem, the nozzles in the long print head are divided into a plurality of blocks, the accumulated number of print dots is counted for each block, the count value multiplied by a weighting value, which is determined according to the position of the block, is compared with a predetermined threshold, and, when at least one of the weighted count values exceeds the predetermined threshold, the recovery operation is executed.
REFERENCES:
patent: 5583547 (1996-12-01), Gast et al.
patent: 6033051 (2000-03-01), Kaneko
patent: 6231156 (2001-05-01), Ono
patent: 6382764 (2002-05-01), Shimoda
patent: 8-132648 (1996-05-01), None
Canon Finetech Inc.
Fitzpatrick ,Cella, Harper & Scinto
Goldberg Brian J.
Patel Vip
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