Abstract: A sheet conveyer device to convey a sheet in a conveyer path, including a first roller pair arranged in an intermediate position in the conveyer path, a feeder to feed the sheet toward the first roller pair during a feeding operation, a discharge portion, on which the sheet is discharged, a second roller pair arranged in the conveyer path in a position closer to the discharge portion than the first roller pair, a control unit to control the first and the second roller pairs to rotate synchronously, and a judging system to judge whether a sheet feeding error has occurred in the feeder, is provided. The control unit controls the first and the second roller pairs to rotate synchronously in a second direction during the feeding operation and in a first direction when the judging system judges that the sheet feeding error has occurred during the feeding operation.

Abstract: A conveying roller is disposed downstream of a feeding roller in a conveying direction and conveys a sheet of recording medium to a printing position along a conveying path. A medium detecting unit is disposed between the feeding roller and the conveying roller along the conveying path and detects the sheet of the recording medium. A printing unit performs printing at the printing position. A target-rotational-amount setting unit sets a target rotational amount for feeding the sheet of the recording medium to the conveying roller, based on a rotational amount of the feeding roller measured from when the feeding roller begins feeding the sheet of the recording medium accommodated in the feeding cassette until the medium detecting unit detects the sheet of the recording medium. A controller controls the feeding roller to continue rotating until the rotational amount of the feeding roller reaches the target rotational amount.

Abstract: A sheet conveyer device to convey a sheet in a conveyer path, including a first roller pair arranged in an intermediate position in the conveyer path, a feeder to feed the sheet toward the first roller pair during a feeding operation, a discharge portion, on which the sheet is discharged, a second roller pair arranged in the conveyer path in a position closer to the discharge portion than the first roller pair, a control unit to control the first and the second roller pairs to rotate synchronously, and a judging system to judge whether a sheet feeding error has occurred in the feeder, is provided. The control unit controls the first and the second roller pairs to rotate synchronously in a second direction during the feeding operation and in a first direction when the judging system judges that the sheet feeding error has occurred during the feeding operation.

Abstract: An image processing device has a main unit, a storage unit, a first processing unit, a second processing unit, a first determination unit, and a first replacement unit. The storage unit is provided in the main unit that stores a color image having ground color and different color from the ground color, the color image being formed by color-pixels including a ground color pixel and a different color pixel, the ground color pixel having the ground color, the different color pixel having the different color. The first processing unit scales down the color image to produce a first gray-scale image which is simply represented by brightness having a plurality of brightness values, the first gray-scale image being formed by first gray-scale pixels. The second processing unit determines the brightness value of each of the color pixels to produce a histogram showing a distribution of the color pixels with respect to the brightness.

Abstract: An image recording apparatus having a both-side printing function for ejecting ink to record images on a first face and a second face of a recording medium is provided. The image recording apparatus includes: a conveying unit which conveys the recording medium; a driving unit which drives the conveying unit; a conveying path along which the recording medium is conveyed; a holding unit which is provided on the conveying path and holds a part of the recording medium; and a controller which controls the image recording apparatus to enter a power saving mode of interrupting power supply to at least the driving unit in a state that the recording medium is held by the holding unit, after the image is recorded on the first face of the recording medium but before the image is recoded on the second face of the recording medium.

Abstract: A fuel cell includes plural gas flow channels, a switching device, and a variable gas flow channel with the function of switching the connection between one gas flow channel and another gas flow channel from series to parallel or from parallel to series.

Abstract: A printing device includes a printing unit, a discharge roller, and a roller controller. The printing unit performs printing on a recording medium at a printing position. The discharge roller is configured to rotatably contact the recording medium on which the printing unit has performed printing, thereby discharging the recording medium. The roller controller controls the discharge roller to rotate such that the discharge roller discharges a recording medium having thickness greater than or equal to a predetermined threshold value at a first speed and that the discharge roller discharges a recording medium having thickness less than the predetermined threshold value at a second speed higher than the first speed.

Abstract: A conveying roller is disposed downstream of a feeding roller in a conveying direction and conveys a sheet of recording medium to a printing position along a conveying path. A medium detecting unit is disposed between the feeding roller and the conveying roller along the conveying path and detects the sheet of the recording medium. A printing unit performs printing at the printing position. A target-rotational-amount setting unit sets a target rotational amount for feeding the sheet of the recording medium to the conveying roller, based on a rotational amount of the feeding roller measured from when the feeding roller begins feeding the sheet of the recording medium accommodated in the feeding cassette until the medium detecting unit detects the sheet of the recording medium. A controller controls the feeding roller to continue rotating, until the rotational amount of the feeding roller reaches the target rotational amount.

Abstract: An inkjet printer includes: a print head; a maintaining unit; a timing unit; a notifying unit; a maintenance command determining unit; and a maintenance operation executing unit. The print head is formed with one or more ink ejection opening for printing a printing medium by ejecting ink through the ink ejection opening. The maintaining unit restores the ink ejection state of the print head by flowing ink through the ink ejection opening. The timing unit keeps track of an elapsed time after the maintaining unit has executed a maintenance operation. The notifying unit notifies a user when it is time to execute a maintenance operation if the elapsed time measured by the timing unit exceeds a prescribed time. The maintenance command determining unit determines whether or not the user has issued a command to execute a maintenance operation with the maintaining unit after the notifying unit has issued a notification.

Abstract: A fuel cell composed with a plural gas flow channels, a switching device, and a variable gas flow channel with the function of to switch connection between one gas flow channel and another one from series to parallel or from parallel to series.

Abstract: A composite catalyst which comprises a catalyst particle and at least one member selected from the group consisting of a porous or net-form cation-exchange resin and a porous or net-form hydrophobia polymer, wherein the resin and polymer exist on the surface of the catalyst particle.

Abstract: A composite catalyst which comprises a catalyst particle and at least one member selected from the group consisting of a porous or net-form cation-exchange resin and a porous or net-form hydrophobic polymer, wherein the resin and polymer exist on the surface of the catalyst particle.

Abstract: A control device comprising a push rod and a wax valve actuating the push rod in response to the temperature of the cooling water of an engine. The push rod is connected to the throttle valve of the carburetor so that the degree of opening of the throttle valve becomes smaller as the temperature of the cooling water of the engine is increased. The amount of air fed into the fuel passage from the air bleed passage is controlled by the push rod so that the amount of the air is increased as the temperature of the cooling water of the engine is increased. A vacuum-operated, time-delay valve is connected between the air-bleed passage and the atmosphere and increases the amount of air fed into the fuel passage from the air-bleed passage following a brief time delay period after the engine starts.