Abstract: The present invention provides a new marker whose orientation can be determined when it is detected by the detection device, without requiring the AR or the VMP.

Abstract: A liquid containing tank for containing a liquid to be supplied to a liquid-jet head. The liquid containing tank includes a containing part containing the liquid supplied from the outside; and a supply channel separated from the containing part by a partition wall rising from the bottom surface of the containing part and supplying the liquid from the containing part to the liquid-jet head. The containing part includes a first region and a second region, the flow speed of the liquid in the first region of the containing part is lower than the flow speed of the liquid in the second region of the containing part, and the horizontal cross sectional area of the first region of the containing part is less than the horizontal cross sectional area of the second region of the containing part.

Abstract: A liquid-ejection head unit includes a head, an electric-circuit board, electronic components, and a storage tank. The head includes a frame member and ejects droplets of liquid. The electronic components are mounted on the electric-circuit board and connected to the head. The storage tank stores liquid supplied to the head. The electric-circuit board is disposed between the frame member of the head and the storage tank to form a single multi-layered structure. The electronic components of the electric-circuit board are accommodated in at least one of a first internal space defined by the frame member of the head and the electric-circuit board and a second internal space defined by the electric-circuit board and the storage tank.

Abstract: An ink ejection head unit includes a head that ejects ink drops from plural two nozzles. The head includes a common liquid chamber connected to the plural nozzles. The common liquid chamber has a supply opening and an ejection opening. A tank is connected to the head and includes an ink containing section that contains ink to be supplied to the head. Also included is a supply path to supply the ink from the ink containing section to the supply opening of the head. An ejection path is provided to eject the ink ejected from the ejection opening of the head to an outside of the ink ejection head unit. A communication path is also provided to communicate the highest section of a seal of the containing section with the ejection path higher than the highest section of the seal. A fluid resistance of the communication path is larger than the total fluid resistance of a path starting from the supply opening to the ejection opening.

Abstract: A liquid containing tank for containing a liquid to be supplied to a liquid-jet head. The liquid containing tank includes a containing part containing the liquid supplied from the outside; and a supply channel separated from the containing part by a partition wall rising from the bottom surface of the containing part and supplying the liquid from the containing part to the liquid-jet head. The containing part includes a first region and a second region, the flow speed of the liquid in the first region of the containing part is lower than the flow speed of the liquid in the second region of the containing part, and the horizontal cross sectional area of the first region of the containing part is less than the horizontal cross sectional area of the second region of the containing part.

Abstract: A liquid-ejection head unit includes a head, an electric-circuit board, electronic components, and a storage tank. The head includes a frame member and ejects droplets of liquid. The electronic components are mounted on the electric-circuit board and connected to the head. The storage tank stores liquid supplied to the head. The electric-circuit board is disposed between the frame member of the head and the storage tank to form a single multi-layered structure. The electronic components of the electric-circuit board are accommodated in at least one of a first internal space defined by the frame member of the head and the electric-circuit board and a second internal space defined by the electric-circuit board and the storage tank.

Abstract: An ink ejection head unit includes a head that ejects ink drops from plural two nozzles. The head includes a common liquid chamber connected to the plural nozzles. The common liquid chamber has a supply opening and an ejection opening. A tank is connected to the head and includes an ink containing section that contains ink to be supplied to the head. Also included is a supply path to supply the ink from the ink containing section to the supply opening of the head. An ejection path is provided to eject the ink ejected from the ejection opening of the head to an outside of the ink ejection head unit. A communication path is also provided to communicate the highest section of a seal of the containing section with the ejection path higher than the highest section of the seal. A fluid resistance of the communication path is larger than the total fluid resistance of a path starting from the supply opening to the ejection opening.

Abstract: To prevent effective print speed from being lowered, a counter is provided for each of a plurality of print hammers. A number of times a print hammer is driven during one print phase having a predetermined period of time is counted by the counter. The counted value is compared with a reference value, and when the counted value has reached the reference value during the print phase, driving of the print hammer is halted until the end of the print phase. A reference value is changed based on the number of times the print hammer is driven during a previous print phase immediately before the present print phase. The reference value represents an allowable number the print hammer can be driven during each of successive print phases.