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US 11,590,755 B2Granted
Liquid ejection device
AssigneeSeiko Epson Corporation
InventorOsamu Shinkawa
Life of this patent
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Abstract
A liquid ejection device includes a first head unit that includes a plurality of first ejection portions, a second head unit that includes a plurality of second ejection portions, a head controller that controls the first head unit and the second head unit, and a signal path via which determination information indicating whether or not a liquid ejection state of one first ejection portion among the plurality of first ejection portions is abnormal is transmitted from the first head unit to the second head unit without passing through the head controller.
Claims8
A liquid ejection device comprising:
- a first head unit that includes
- a plurality of first ejection portions,
- a first determination circuit that determines a liquid ejection state of each of the plurality of first ejection portions and generates first determination information indicating whether or not the liquid ejection state of each of the plurality of first ejection portions is abnormal, and
- a first transmission portion that transmits the first determination information;
- a second head unit that includes
- a plurality of second ejection portions,
- a second determination circuit that determines a liquid ejection state of each of the plurality of second ejection portions and generates second determination information indicating whether or not the liquid ejection state of each of the plurality of second ejection portions is abnormal, and
- a second transmission portion that transmits the second determination information;
- a head controller that controls the first head unit and the second head unit;
- a first signal path via which the first determination information is transmitted from the first head unit to the second head unit without passing through the head controller;
- and
- a second signal path via which the second determination information is transmitted from the second head unit to the first head unit without passing through the head controller, the second signal path being different from the first signal path,
- the first transmission portion transmitting the first determination information from the first head unit to the second head unit without the first determination information passing through the head controller, after the first determination circuit determines the liquid ejection state for all of the plurality of first ejection portions, and
- the second transmission portion transmitting the second determination information from the second head unit to the first head unit without the second determination information passing through the head controller, after the second determination circuit determines the liquid ejection state for all of the plurality of second ejection portions.
11 more elements
Dependencies are inferred from the claim text.