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(11) | EP 0 931 668 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Recording method in ink jet printer |
| (57) An ink jet printer and its recording method. A control for varying a feeding pitch
of a recording sheet and a control of ink ejecting of each nozzle are performed. On
the condition that there is no common divisor between the number of nozzles n and a pitch interval between nozzles m and that a relationship of n=pm+q(p≥1,m≥2, 1≤q≤m-1) is satisfied, recording operation is performed as follows: after all m×n lines are
recorded by one pitch feed, n pitch feed is performed while only the nozzles not overlapping the recorded lines
are allowed to eject ink. After the n pitch feed is performed m-1 times, each n pitch feed is performed while all the nozzles are allowed to eject
the ink. All the recorded lines are recorded without being overlapped or generating
any gap. No non-recorded area is generated in a top end of the recording sheet. The
effect use of recording sheet and the enlargement of recorded area can be realized.
At the i-th (1≤i≤m-1) n pitch feed, [i×n/m]+1 nozzles, represented by Gauss' notation, from the downstream side (terminal end)
in the recording sheet feeding direction are allowed to eject the ink. |