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Analogous to our example variant 5, the above figure shows an unusual arrangement of nozzle rows for the operation of a scanning machine. Each head block contains 2 rows of nozzles that are equipped with one color and are arranged offset from each other by half a nozzle spacing.
A special feature of this high quality printing setup is that the 8 head blocks in this example are moved in the print direction over just over one eighth of the print width to be imaged. The outputs of the adjacent head blocks are softly woven into each other in an overlap area.
In order to achieve the same job sequence in both directions of movement, the individual rows of nozzles were loaded with ink in a mirrored pattern, starting from the center of the head blocks.
The concept is suitable for high-volume applications that regularly utilize an intended print width. The number of head blocks used can be successively increased without major conversions. Small-format conditions can be maintained while output is increased by increasing the printing width. The use of this unusual process can be an interesting alternative to single-pass operation.
The print resolution can be freely set in the head run direction and in the material run direction can be an integer multiple of the resolution resulting from the basic grid of cooperating nozzles. The quality can be determined by a relatively free selection of the multipassing process.
Since the droplet masses of the head blocks arranged next to each other must be kept fairly equal, the use of an actively controlled vacuum system in the ink supply is recommended. Since the print heads are arranged above the print bed during operation, this variant places increased demands on the design of a capping and cleaning unit.