Abstract: An image reading apparatus includes: a conveyance unit configured to convey the original; an image reading unit configured to read an image of the original conveyed by the conveyance unit by using a reading sensor to generate image data which represents a reading result; at least one processor configured to: detect a streak image in an image represented by the image data based on the image data; determine a content area in the image represented by the image data, the content area being an area where content is printed, and perform correction processing for removing the streak image by correcting the image data; wherein the at least one processor is configured to be operable in a first reading mode in which the correction processing is performed to image data corresponding to the streak image in an area outside the content area.

Abstract: An image reading apparatus includes: a conveyance unit configured to convey the original; an image reading unit configured to read an image of the original conveyed by the conveyance unit by using a reading sensor to generate image data which represents a reading result; at least one processor configured to: detect a streak image in an image represented by the image data based on the image data; determine a content area in the image represented by the image data, the content area being an area where content is printed, and perform correction processing for removing the streak image by correcting the image data; wherein the at least one processor is configured to be operable in a first reading mode in which the correction processing is performed to image data corresponding to the streak image in an area outside the content area.

Abstract: Provided is an image reading apparatus including: an image reading unit configured to output image data representing an image read from an original; and an image control board configured to acquire the image data by controlling an operation of the image reading unit. When a shading error occurs, the image control board determines a part that has caused the shading error by determining whether or not a power supply voltage is being normally supplied to the image reading unit, determining whether or not a light source is normally emitting light, determining whether or not a memory is normally operating, and determining whether or not data output from the image reading unit is normally stored in the memory.

Abstract: Provided is an image reading apparatus including: an image reading unit configured to output image data representing an image read from an original; and an image control board configured to acquire the image data by controlling an operation of the image reading unit. When a shading error occurs, the image control board determines a part that has caused the shading error by determining whether or not a power supply voltage is being normally supplied to the image reading unit, determining whether or not a light source is normally emitting light, determining whether or not a memory is normally operating, and determining whether or not data output from the image reading unit is normally stored in the memory.

Abstract: An image reading apparatus that is capable of determining whether an original is a blank-paper original without stopping a reading operation. A feeding unit feeds an original to a read position. A read unit is equipped with a plurality of line sensors that read the original at the read position. An obtaining unit obtains dust-position information about dust adhering to the read position based on image information that is obtained by reading a guide member arranged corresponding to the read position with the read unit before reading the original. A determination unit determines whether the original is a blank-paper original using image information corresponding to pixels without being affected by the dust that is obtained by excluding image information corresponding to the dust-position information from image information read by the line sensors of the read unit.

Abstract: An image reading apparatus that is capable of determining whether an original is a blank-paper original without stopping a reading operation. A feeding unit feeds an original to a read position. A read unit is equipped with a plurality of line sensors that read the original at the read position. An obtaining unit obtains dust-position information about dust adhering to the read position based on image information that is obtained by reading a guide member arranged corresponding to the read position with the read unit before reading the original. A determination unit determines whether the original is a blank-paper original using image information corresponding to pixels without being affected by the dust that is obtained by excluding image information corresponding to the dust-position information from image information read by the line sensors of the read unit.

Abstract: An image reading device capable of avoiding erroneous determination in blank-paper detection of an original of an irregular size even when different width originals mixed and loaded are processed at a time. An original placed on a tray is conveyed through a conveyance path. An image reading sensor reads an image of the original. A blank-paper detection unit determines whether the original is blank paper. A determination unit determines whether the original is a regular size or an irregular size. A control unit controls not to output image data of the original when the determination unit determines that the original is a regular size and the blank-paper detection unit determines that the original is blank paper, and controls to output image data of the original when the determination unit determines that the original is an irregular size and the blank-paper detection unit determines that the original is blank paper.

Abstract: A document reading apparatus includes a reading unit configured to read the document being conveyed at a reading position, a white member disposed opposite to the reading position, a reference value determination unit configured to determine a reference value from an output value of the reading unit obtained when the reading unit reads the white member, a detection unit configured to detect a shadow generated by a leading edge of the document from the reference value and an output value of the reading unit obtained before the leading edge of the document is conveyed, a streak pixel position determination unit configured to determine a streak pixel position from an output value of the reading unit corresponding to a position of the document which is determined based on a detection result by the detection unit, and a correction unit configured to perform a streak correction based on the streak pixel position.

Abstract: An image reading device capable of avoiding erroneous determination in blank-paper detection of an original of an irregular size even when different width originals mixed and loaded are processed at a time. An original placed on a tray is conveyed through a conveyance path. An image reading sensor reads an image of the original. A blank-paper detection unit determines whether the original is blank paper. A determination unit determines whether the original is a regular size or an irregular size. A control unit controls not to output image data of the original when the determination unit determines that the original is a regular size and the blank-paper detection unit determines that the original is blank paper, and controls to output image data of the original when the determination unit determines that the original is an irregular size and the blank-paper detection unit determines that the original is blank paper.

Abstract: A refrigerant circuit is configured, which includes an electric compressor, a condenser, an expansion mechanism, an evaporator, a hot gas introduction path connecting the electric compressor and the evaporator together, and a switching valve for controlling a flow of refrigerant in the hot gas introduction path. In addition, a fan is provided. In a defrosting cycle for introducing refrigerant into the evaporator through the hot gas introduction path to defrost the evaporator, if the pressure of the condenser is equal to or lower than a predetermined threshold, the fan forms an air flow from a radiator to the condenser.

Abstract: A document reading apparatus includes a reading unit configured to read the document being conveyed at a reading position, a white member disposed opposite the reading position, a reference value determination unit configured to determine a reference value from an output value of the reading unit obtained when the reading unit reads the white member, a detection unit configured to detect a shadow generated by a leading edge of the document from the reference value and an output value of the reading unit obtained before the leading edge of the document is conveyed, a streak pixel position determination unit configured to determine a streak pixel position from an output value of the reading unit corresponding to a position of the document which is determined based on a detection result by the detection unit, and a correction unit configured to perform a streak correction based on the streak pixel position.

Abstract: The refrigeration system has an energy saving operation mode performing: a first action in which a compressor (11) and an internal fan (16) are driven while the cooling capacity of an evaporator (14) is regulated; a second action in which, when the blow-off-side air temperature in a cold storage is kept at a set value in the first action, the cooling capacity of the evaporator (14) is increased to lower the blow-off-side air temperature to a lower limit temperature of a desired temperature range containing the set value and the compressor (11) and the internal fan (16) are then stopped; and a third action in which, when the blow-off-side air temperature after the second action rises to an upper limit temperature of the desired temperature range, the first action is restarted.

Abstract: A refrigerant circuit is configured, which includes an electric compressor, a condenser, an expansion mechanism, an evaporator, a hot gas introduction path connecting the electric compressor and the evaporator together, and a switching valve for controlling a flow of refrigerant in the hot gas introduction path. In addition, a fan is provided. In a defrosting cycle for introducing refrigerant into the evaporator through the hot gas introduction path to defrost the evaporator, if the pressure of the condenser is equal to or lower than a predetermined threshold, the fan forms an air flow from a radiator to the condenser.

Abstract: When during a first action of a refrigeration system the internal cold storage temperature is held at a desired temperature by an evaporator, the refrigeration system performs a second action of increasing the cooling capacity of the evaporator to decrease the internal cold storage temperature. When during the second action the internal cold storage temperature reaches a minimum temperature Tmin, the refrigeration system stops a compressor and performs a third action. When during the third action the internal cold storage temperature reaches a maximum temperature Tmin, the refrigeration system drives the compressor and performs the first action.

Abstract: If the degree of opening of an electronic expansion valve (14) continues to remain below a specified degree of opening or if the degree of superheat of an evaporator (15) continues to remain above a predetermined degree of superheat, it is determined that the refrigerant circulation amount is in short supply in the water-cooled operation mode, and an air-cooled condenser fan (21) is tuned on.

Abstract: The refrigeration system has an energy saving operation mode performing: a first action in which a compressor (11) and an internal fan (16) are driven while the cooling capacity of an evaporator (14) is regulated; a second action in which, when the blow-off-side air temperature in a cold storage is kept at a set value in the first action, the cooling capacity of the evaporator (14) is increased to lower the blow-off-side air temperature to a lower limit temperature of a desired temperature range containing the set value and the compressor (11) and the internal fan (16) are then stopped; and a third action in which, when the blow-off-side air temperature after the second action rises to an upper limit temperature of the desired temperature range, the first action is restarted.

Abstract: If the degree of opening of an electronic expansion valve (14) is kept below a specified degree of opening or if the degree of superheat of refrigerant at an evaporator (15) side is kept above a specified degree of superheat, the amount of circulating refrigerant is judged to be insufficient. Thus, the volume of an air delivered by an evaporator fan (22) is reduced.

Abstract: A refrigeration apparatus (10) includes: a refrigerant circuit (20) provided with a variable-opening expansion valve (13); and a valve control means (33) for controlling the opening of the expansion valve (13) by outputting to the expansion valve (13) an opening command value equal to or larger than a lower limit command value. During operation of a refrigeration cycle and in a lower-limit-controlled state in which the opening command value is equal to the lower limit command value, the valve control means (33) performs a first determination operation of determining whether the refrigerant flow through the expansion valve (13) is in an excessively large amount state or not based on a condition of refrigerant between the expansion valve (13) and the suction side of a compressor (11), and corrects the lower limit command value to a smaller value if the determination result in the first determination operation is that the refrigerant flow through the expansion valve (13) is in an excessively large amount state.

Abstract: A refrigeration apparatus (10) includes: a valve control means (33) configured to control the opening of an expansion valve (13); and opening degree detection means (32, 34) configured to perform, after a pump-down operation in which a compressor (11) is driven with the expansion valve (13) closed, an opening degree detection operation of detecting an opening degree that is an opening command value for use in changing the expansion valve (13) from a closed state to an open state, by determining whether the expansion valve (13) is open based on a change in state of low-pressure refrigerant between the expansion valve (13) and the suction side of the compressor (11), while gradually increasing the opening command value output to the expansion valve (13) with the compressor (11) deactivated. The valve control means (33) controls the expansion valve (13) using the opening degree detected in the opening degree detection operation.

Abstract: If the degree of opening of an electronic expansion valve (14) is kept below a specified degree of opening or if the degree of superheat of refrigerant at an evaporator (15) side is kept above a specified degree of superheat, the amount of circulating refrigerant is judged to be insufficient. Thus, the volume of an air delivered by an evaporator fan (22) is reduced.