Abstract: An object determining apparatus includes a memory storing instructions, and a processor configured to execute the instructions to detect an object from image data obtained by imaging, acquire information about orientation of the object from the image data, determine a main object in the image data using a detection result of the object and the information about the orientation, and change a condition for determining the main object according to one of the detection result of the object and the information about the orientation, using the other of the detection result of the object and the information about the orientation.

Abstract: An apparatus configured to perform focus tracking on an object within a detection area to detect a defocus amount within an imaging angle of view includes a memory storing instructions, and a processor configured to execute the instructions to perform focus tracking determination to determine whether or not the focus tracking is to be performed using information about the defocus amount, and acquire information about a shield against the object from image data generated by imaging. The processor is configured to perform the focus tracking determination using information about the shield acquired in the detection area.

Abstract: A tank includes a tank main body configured to house liquid and a lid configured to cover an upper side of the tank main body. The tank main body includes an atmosphere communication hole having an opening opened on an upper surface of the tank main body and a lowered step portion dug down from a periphery of the opening. The lid includes a recess formed on a lower surface of the lid and facing the opening.

Abstract: An inkjet printing device includes an inkjet head that ejects ink to paper to be transported, a blocking unit that blocks ink mist on a downstream side of the inkjet head in a transport direction of paper, an ink mist collection mechanism and a belt platen that collect ink mist blocked by the blocking unit.

Abstract: A tank includes: a liquid container configured to store a liquid; an inlet opening through which the liquid flows into the liquid container; an outlet opening through which the liquid flows out from the liquid container; and a channel formation member arranged between the inlet opening and the outlet opening and configured to form channels. Widths of the channels are such that a channel at a position where stagnation of the liquid is more likely to occur has a larger width.

Abstract: An agitation device includes a first agitator configured to agitate. The first agitator includes: a container configured to house the ink obtained from an ink cartridge; an agitation route being a route which is separated from the ink cartridge and through which the ink housed in the container flows out from the container and returns to the container; and a liquid deliverer configured to deliver the ink such that the ink flows out from the container and returns to the container through the agitation route.

Abstract: A tank includes: a liquid container configured to store a liquid; an inlet opening through which the liquid flows into the liquid container; an outlet opening through which the liquid flows out from the liquid container; and a channel formation member arranged between the inlet opening and the outlet opening and configured to form channels. Widths of the channels are such that a channel at a position where stagnation of the liquid is more likely to occur has a larger width.

Abstract: A tank includes a tank main body configured to house liquid and a lid configured to cover an upper side of the tank main body. The tank main body includes an atmosphere communication hole having an opening opened on an upper surface of the tank main body and a lowered step portion dug down from a periphery of the opening. The lid includes a recess formed on a lower surface of the lid and facing the opening.

Abstract: An inkjet printing device includes an inkjet head that ejects ink to paper to be transported, a blocking unit that blocks ink mist on a downstream side of the inkjet head in a transport direction of paper, an ink mist collection mechanism and a belt platen that collect ink mist blocked by the blocking unit.

Abstract: An inkjet printer includes: a pressurized space and a depressurized space for circulation of ink along a circulation path; a main connection path and an adjustment path connecting the pressurized space and the depressurized space to each other; an air pump configured to send air from the depressurized space to the pressurized space though the main connection path or the adjustment path; a changeover device configured to change over between the main connection path and the adjustment path; and a controller. The controller drives the air pump with the main connection path being set to generate preset pressures respectively in the pressurized space and the depressurized space and then controls the air pump with the adjustment path being changed over to maintain pressures in the pressurized space and the depressurized space respectively at the preset pressures.

Abstract: An inkjet printer includes: a pressurized space and a depressurized space for circulation of ink along a circulation path; a main connection path and an adjustment path connecting the pressurized space and the depressurized space to each other; an air pump configured to send air from the depressurized space to the pressurized space though the main connection path or the adjustment path; a changeover device configured to change over between the main connection path and the adjustment path; and a controller. The controller drives the air pump with the main connection path being set to generate preset pressures respectively in the pressurized space and the depressurized space and then controls the air pump with the adjustment path being changed over to maintain pressures in the pressurized space and the depressurized space respectively at the preset pressures.

Abstract: An ink temperature adjustment device and an inkjet printer include an ink temperature adjustment path connected to a midway point on an ink supply path for supplying ink to an inkjet head configured to form an image by ejecting the ink. The ink temperature adjustment path is for adjusting a temperature of the ink supplied to the inkjet head. The ink temperature adjustment path includes an upflow path for the ink to flow upward and a downflow path for the ink to flow downward. A total cross-sectional area of the upflow path is larger than a total cross-sectional area of the downflow path.

Abstract: When a face of a paper sheet to be discharged on which an image is formed faces downward, a paper discharge device divides an image region of image data on the paper sheet to be discharged into areas along a discharge direction, detects an area in which maximum image density for each divided area is higher than or equal to a specified threshold, and controls a discharge angle so that the detected area does not come into contact with a stacked paper sheet until the paper sheet to be discharged has been discharged from a discharge roller.

Abstract: An inkjet image forming apparatus includes inkjet heads each of which has two or more nozzle rows from which ink of different colors is injected (each of the nozzle rows includes nozzle holes), a wipe unit that includes wipers and carries out a wipe process to wipe away ink remained on a surface on which the nozzle rows are formed by the wipers, and a flush unit that carries out a flush process after the wipe process by injecting ink from nozzle holes into which ink of different color from color of ink that is injected from the nozzle holes flows during the wipe process. According to the apparatus, an amount of ink consumed in the flush process can be reduced and a replacement cycle of a mist-absorbing material for absorbing ink mists generated during the flush process can be prolonged.

Abstract: An inkjet printing device includes a printer, including an inkjet head having a nozzle configured to eject ink, an ink tank configured to store the ink, a circulation path configured to circulate ink between the ink tank and the inkjet head, an ink pump configured to send the ink from the ink tank to the inkjet head in order to circulate ink and an ink temperature detector configured to detect an ink temperature, a pressure regulator configured to apply a negative pressure to the ink tank and to regulate a pressure in the ink tank and a controller configured to control the pressure regulator in accordance with the ink temperature in the printer to regulate the pressure in the ink tank and to regulate a driving rate of the ink pump.

Abstract: Upon supply of inks to second tanks of a plurality of printing units with the second tanks in communication with each other via a negative-pressure common air chamber in an air-tight state and with a negative-pressure force applied to the second tanks and the negative-pressure common air chamber, a controller is configured to drive ink supply units of the plurality of printing units to supply the inks such that times in which the inks flow into the second tanks in the plurality of printing units do not coincide with each other.

Abstract: A controller, upon a pressure of one tank of a positive pressure tank and a negative pressure tank reaching a setting pressure of the one tank prior to a pressure of the other tank reaching a setting pressure of the other tank after driving an air pump, sets an air opening valve opening time at each unit time according to a difference between the pressure of the one tank and the pressure of the other tank, and repeatedly drives one of a positive-pressure-side air opening valve and a negative-pressure-side air opening valve corresponding to the one tank to switch to and hold an air open state of the one tank for the set air opening valve opening time within the unit time, until the pressure of the other tank reaches the setting pressure of the other tank.

Abstract: A common air chamber is connected to an air layer of a pressurizing tank and to an air layer of a negative-pressure tank. A pressurizing-side communication valve opens/closes an air channel in an air conduit between the pressurizing tank and the common air chamber. A negative-pressure side communication valve opens/closes an air channel in an air conduit between the negative-pressure tank and the common air chamber. A negative-pressure tank atmospheric air opening valve switches the negative-pressure tank between a state shut off from the atmospheric air and a state open thereto. The pressurizing-side communication valve and the negative-pressure tank atmospheric air opening valve are of a normally-open type closed when electrified and open when not. The negative-pressure side communication valve is of a normally-closed type open when electrified and closed when not. While not electrified, a nozzle pressure of an inkjet head becomes a meniscus breakage pressure or less.

Abstract: A controller regulates pressures of a positive pressure space and a negative pressure space and maintains the pressures at setting pressures when ink is circulated in a circulation path, by: driving an air pump to apply the setting pressures to the positive pressure space and the negative pressure space; and after the setting pressures are applied, controlling opening and closing of a positive-pressure-side pressure regulation valve, opening and closing of a negative-pressure-side pressure regulation valve, and driving of the air pump according to the pressures in the positive pressure space and the negative pressure space, and opening the positive-pressure-side pressure regulation valve or the negative-pressure-side pressure regulation valve simultaneously with the driving of the air pump.

Abstract: A controller, upon a pressure of one tank of a positive pressure tank and a negative pressure tank reaching a setting pressure of the one tank prior to a pressure of the other tank reaching a setting pressure of the other tank after driving an air pump, sets an air opening valve opening time at each unit time according to a difference between the pressure of the one tank and the pressure of the other tank, and repeatedly drives one of a positive-pressure-side air opening valve and a negative-pressure-side air opening valve corresponding to the one tank to switch to and hold an air open state of the one tank for the set air opening valve opening time within the unit time, until the pressure of the other tank reaches the setting pressure of the other tank.