Various embodiments of a printer modification system for modifying a printer to accommodate different sized documents such as elections documents are disclosed herein.

A print media detection apparatus may include a movable scanner bar for scanning media, a feeder tray for supplying the print media, a print media indicator and a controller. The print media indicator may include a first portion to interact with the print media within the feeder tray and a second portion coupled to the first portion to move in response to movement of the first portion. The scanner bar is to sense the second portion of the media indicator. The controller is to determine a characteristic of the print media within the feeder tray based upon sensing of the second portion by the scanner bar.

A sheet feeding device includes a sheet supporting unit, a sheet feeding unit, and a regulating member. The regulating member includes a supporting surface portion on which the sheet is placed, and a regulation surface portion provided continuously with the supporting surface portion and configured to regulate the position of the sheet in a width direction. The supporting surface portion includes a supporting surface color indicating portion including an end portion of the supporting surface portion on a side of the regulation surface portion and having a color with brightness of 7 or less in the Munsell color system. The regulation surface portion includes a regulation surface color indicating portion including an end portion of the regulation surface portion on a side of the supporting surface portion and having a color with brightness higher than the brightness of the supporting surface color indicating portion.

A sheet feeding device includes a sheet supporting unit, a sheet feeding unit, and a regulating member. The regulating member includes a supporting surface portion on which the sheet is placed, and a regulation surface portion provided continuously with the supporting surface portion and configured to regulate the position of the sheet in a width direction. The supporting surface portion includes a supporting surface color indicating portion including an end portion of the supporting surface portion on a side of the regulation surface portion and having a color with brightness of 7 or less in the Munsell color system. The regulation surface portion includes a regulation surface color indicating portion including an end portion of the regulation surface portion on a side of the supporting surface portion and having a color with brightness higher than the brightness of the supporting surface color indicating portion.

An image forming apparatus includes a cover portion and an auxiliary tray. The cover portion is displaced between a closing position for closing the supply port and an opening position for opening the supply port. The auxiliary tray is attached to a sheet stack surface of the cover portion, and supports the sheet, together with the cover portion at the opening position. The auxiliary tray is, either in a first attachment state or in a second attachment state, attached to the cover portion. In the first attachment state, a longitudinal direction of the auxiliary tray extends along a width direction that crosses a sheet insertion direction and the auxiliary tray is stored in the sheet stack surface. In the second attachment state, the longitudinal direction extends along the sheet insertion direction, and the auxiliary tray extends out from the cover portion toward an upstream in the sheet insertion direction.

A medium transport device includes a feeding roller that feeds a recording medium, a transport roller that transports the recording medium toward a recording head, and a transport motor which is a common driving source for the feeding roller and the transport roller. The medium transport device includes a power transmission mechanism that transmits power of the transport motor to the feeding roller, and a control section that controls a current of the transport motor. The control section measures a current value flowing through the transport motor during driving as a measured current value, and adds a predetermined offset value to the measured current value to set a second limit value as a limit value of the current supplied to the transport motor.

An image forming apparatus includes a main body, a sheet cassette, and a controller. The main body includes a first electrode, a second electrode, and a capacitance detector configured to output a signal indicating a value corresponding to a quantity of electricity stored in the first electrode and the second electrode. The sheet cassette includes a sheet guide, and a conductor disposed in an upper portion of the sheet guide. In a state in which the sheet cassette is at an installation position defined in the main body, the first electrode and the second electrode face the conductor in an up-down direction and are at different positions in a moving direction in which the sheet guide is movable. The controller is configured to detect a position of the sheet guide from the value of the signal outputted from the capacitance detector.

An image forming apparatus includes a main body, a sheet cassette, and a controller. The main body includes a first electrode, a second electrode, and a capacitance detector configured to output a signal indicating a value corresponding to a quantity of electricity stored in the first electrode and the second electrode. The sheet cassette includes a sheet guide, and a conductor disposed in an upper portion of the sheet guide. In a state in which the sheet cassette is at an installation position defined in the main body, the first electrode and the second electrode face the conductor in an up-down direction and are at different positions in a moving direction in which the sheet guide is movable. The controller is configured to detect a position of the sheet guide from the value of the signal outputted from the capacitance detector.

An image forming apparatus includes a photosensitive drum, a light exposure device, a developing device, a fixing unit disposed opposite to the light exposure device relative to the developing device, a sheet supply tray disposed below the developing device, an ejection tray disposed above the developing device and having a sheet receiving surface inclined downward, relative to a horizontal direction, toward the charger, and a sheet conveying path through which a sheet is conveyed from the sheet supply tray to the ejection tray. A lowest end portion of the sheet receiving surface is disposed below an upper end of the charger in the vertical direction. The charger is disposed opposite to the developing device relative to the lowest end portion of the sheet receiving surface.

The sheet feeding device includes a feed roller, a separation pad and a guide part. The feed roller is configured to feed a sheet by being rotated while coming into pressure contact with the sheet. The separation pad is configured to form a separation nip by being in pressure contact with the feed roller and to separate the fed sheet at the separation nip. The guide part is configured to guide a leading edge of the sheet to the separation nip. The apex part is formed along a feeding direction of the sheet on both outer sides of the feed roller in a width direction perpendicular to the feeding direction. The apex part projects in a direction closer to the feed roller than an extension line of the separation nip between a pressure contact position of the feed roller and the sheet and the separation nip.