A sheet feeding device and a printing apparatus capable of estimating a number of remaining sheets without error include a loading member on which sheets are loaded, a lift unit that moves the loading member up and down, a position detection unit that detects a lift-up position to which the loading member moves up, a sheet detection unit that detects that a sheet at an uppermost position of the sheets loaded on the loading member has moved up to a feeding position by an upward movement of the loading member, a feeding roller that feeds a sheet at the feeding position, and an estimation unit that estimates the number of remaining sheets loaded on the loading member based on a combination of detection results of the sheet detection unit and the position detection unit.

A feeding device includes a first feeding unit, a second feeding unit, and a fixing structure. The first feeding unit feeds a first recording medium. The second feeding unit is located below the first feeding unit and feeds a second recording medium. The fixing structure takes a first posture or a second posture differing from the first posture. The fixing structure fixes the second feeding unit to the first feeding unit when the fixing structure is in the first posture. The fixing structure fixes the second feeding unit to the first feeding unit by fixing a third frame member of the second feeding unit to a second frame member of the first feeding unit. When the fixing structure is in the second posture, the fixing structure releases linkage between the second feeding unit and the first feeding unit.

A feeding device includes a first feeding unit, a second feeding unit, and a fixing structure. The first feeding unit feeds a first recording medium. The second feeding unit is located below the first feeding unit and feeds a second recording medium. The fixing structure takes a first posture or a second posture differing from the first posture. The fixing structure fixes the second feeding unit to the first feeding unit when the fixing structure is in the first posture. The fixing structure fixes the second feeding unit to the first feeding unit by fixing a third frame member of the second feeding unit to a second frame member of the first feeding unit. When the fixing structure is in the second posture, the fixing structure releases linkage between the second feeding unit and the first feeding unit.

An image forming apparatus includes a controller configured to start feeding a sheet from a feeding unit without confirming a presence or absence of an insert sheet to be inserted before the sheet when an amount of insert sheets stacked on a stacking tray as a feed source is higher than a predetermined amount. In a case in which the amount of the insert sheets on the stacking tray is lower than the predetermined amount, the controller starts feeding a sheet from the feeding unit without confirming a presence or absence of the insert sheet when another stacking tray on which an amount of insert sheets is higher than the predetermined amount is present, and the controller starts feeding the sheet from the feeding unit after confirming the presence or absence of the insert sheet when the other stacking tray is absent.

An image forming apparatus includes a controller configured to start feeding a sheet from a feeding unit without confirming a presence or absence of an insert sheet to be inserted before the sheet when an amount of insert sheets stacked on a stacking tray as a feed source is higher than a predetermined amount. In a case in which the amount of the insert sheets on the stacking tray is lower than the predetermined amount, the controller starts feeding a sheet from the feeding unit without confirming a presence or absence of the insert sheet when another stacking tray on which an amount of insert sheets is higher than the predetermined amount is present, and the controller starts feeding the sheet from the feeding unit after confirming the presence or absence of the insert sheet when the other stacking tray is absent.

In accordance with an embodiment, an image processing apparatus comprises a first opening and closing member, a second opening and closing member, a first tooth section, a second tooth section, and an intermediary tooth section. The first opening and closing member is opened and closed with respect to an apparatus main body with a first hinge as the center. The second opening and closing member is opened and closed with a second hinge arranged in the first opening and closing member as the center. The first tooth section comprises a plurality of teeth fixed coaxially with the first hinge. The second tooth section comprises a plurality of teeth supported coaxially with the second hinge. The intermediary tooth section is engaged with the first tooth section and the second tooth section between the first tooth section and the second tooth section.

In accordance with an embodiment, an image processing apparatus comprises a first opening and closing member, a second opening and closing member, a first tooth section, a second tooth section, and an intermediary tooth section. The first opening and closing member is opened and closed with respect to an apparatus main body with a first hinge as the center. The second opening and closing member is opened and closed with a second hinge arranged in the first opening and closing member as the center. The first tooth section comprises a plurality of teeth fixed coaxially with the first hinge. The second tooth section comprises a plurality of teeth supported coaxially with the second hinge. The intermediary tooth section is engaged with the first tooth section and the second tooth section between the first tooth section and the second tooth section.

There is provided an image forming apparatus including a casing, a feeder unit, an image recording unit, a conveyance mechanism, an installation/removal sensor, and a controller. The controller carries out the process of: interrupting an image recording of the image recording unit if there is no recording medium supported by trays, restarting the image recording of the image recording unit by feeding the medium from a second tray after a first predetermined time has elapsed since such a time when the second tray is detected as the earliest one being removed and reinstalled, and restarting the image recording of the image recording unit by feeding the medium from a first tray if the first tray is detected as the earliest one but the second tray is not detected as being removed within a second predetermined time being longer than the first predetermined time.

A paper sheet recycling and printing apparatus includes a paper sheet recycling section which manufactures a recycled paper sheet; a printing section which prints recording information on a recording target medium including the recycled paper sheet; a plurality of recycled paper sheet storage sections including a first recycled paper sheet storage section and a second recycled paper sheet storage section in which the recycled paper sheet is stored; a recycled paper sheet supply section which supplies the recycled paper sheet from the paper sheet recycling section to the recycled paper sheet storage section; and a transport section which transports the recording target medium to the printing section. The transport section transports the recycled paper sheet stored in the first recycled paper sheet storage section to the printing section, and the recycled paper sheet supply section supplies the recycled paper sheet to the second recycled paper sheet storage section.

A paper sheet recycling and printing apparatus includes a paper sheet recycling section which manufactures a recycled paper sheet; a printing section which prints recording information on a recording target medium including the recycled paper sheet; a plurality of recycled paper sheet storage sections including a first recycled paper sheet storage section and a second recycled paper sheet storage section in which the recycled paper sheet is stored; a recycled paper sheet supply section which supplies the recycled paper sheet from the paper sheet recycling section to the recycled paper sheet storage section; and a transport section which transports the recording target medium to the printing section. The transport section transports the recycled paper sheet stored in the first recycled paper sheet storage section to the printing section, and the recycled paper sheet supply section supplies the recycled paper sheet to the second recycled paper sheet storage section.