Liquid ejection apparatus, liquid ejection system, and liquid ejection method

A liquid ejection system including at least one liquid ejection apparatus, the liquid ejection system comprising:

• a plurality of liquid ejection head units that are configured to eject liquid onto a conveyed object at different positions along a conveying path for conveying the conveyed object;
• a first support member that supports the conveyed object and is provided upstream of a landing position of the liquid ejected onto the conveyed object by a corresponding liquid ejection head unit of the plurality of liquid ejection head units;
• a second support member that supports the conveyed object and is provided downstream of the landing position of the corresponding liquid ejection head unit;
• at least one first detection unit that is installed between the first support member and the second support member and is configured to detect a position of the conveyed object with respect to an orthogonal direction that is orthogonal to a conveying direction of the conveyed object;
• at least one second detection unit that is installed upstream of the first support member provided upstream of a first liquid ejection head unit from among the plurality of liquid ejection head units, the first liquid ejection head unit being positioned first in sequence along the conveying path among the plurality of liquid ejection head units and is configured to detect the position of the conveyed object with respect to the orthogonal direction;
• and
• a movement control unit that is configured to move each liquid ejection head unit of the plurality of liquid ejection head units based on at least two detection results selected from a plurality of detection results output by the first detection unit and the second detection unit.

A liquid ejection method that is implemented by a liquid ejection apparatus including

• a plurality of liquid ejection head units that are configured to eject liquid onto a conveyed object at different positions along a conveying path for conveying the conveyed object;
• a first support member that supports the conveyed object and is provided upstream of a landing position of the liquid ejected onto the conveyed object by a corresponding liquid ejection head unit of the plurality of liquid ejection head units;
• a second support member that supports the conveyed object and is provided downstream of the landing position of the corresponding liquid ejection head unit;
• at least one first detection unit that is installed between the first support member and the second support member and is configured to detect a position of the conveyed object with respect to an orthogonal direction that is orthogonal to a conveying direction of the conveyed object;
• and
• at least one second detection unit that is installed upstream of the first support member provided upstream of a first liquid ejection head unit from among the plurality of liquid ejection head units, the first liquid ejection head unit being positioned first in sequence along the conveying path among the plurality of liquid ejection head units and is configured to detect the position of the conveyed object with respect to the orthogonal direction;
• the liquid ejection method comprising:
• moving each liquid ejection head unit of the plurality of liquid ejection head units based on at least two detection results selected from a plurality of detection results output by the first detection unit and the second detection unit.