An image forming apparatus comprises a plurality of sheet detection units, provided at different positions along a sheet width direction, configured to detect the sheet conveyed on a conveyance path. A controller determines, by using the plurality of sheet detection units, a presence or absence of a sheet being conveyed in each of a plurality of regions sectioned in the sheet width direction, and determines, based on input image data, a presence or absence of an image to be formed in each of the plurality of regions. The controller further determines, based on the above determination results, whether or not the image to be formed on the sheet being conveyed is to be formed with a deviation from the sheet, and controls an image forming operation in accordance with this determination result.

A printing apparatus has: a paper tray having edge guides, each of which can guide one edge of paper in its width direction intersecting the transport direction of the paper; a paper width sensor that detects a paper width allowable in the paper tray according to the positions of the edge guides; a display controller that displays, on a display unit, a paper size selection screen on which candidate paper sizes corresponding to the paper width detected by the paper width sensor are displayed; and a selected size storage section that stores, in a storage section, paper selection information in which the paper width and the paper size selected on the paper size selection screen are related to each other.

A fixing device includes a sensor driving unit that drives a temperature sensor to be movable in an axial direction of a fixing rotating body, and a sensor position control unit that controls the position of the temperature sensor by the sensor driving unit. The sensor position control unit performs sensor position control for setting a sheet size identified by a size identification unit as a reference sheet size and allowing the temperature sensor to be located within a passage area of a sheet having the reference sheet size and a non-passage area of a sheet having a sheet size smaller by one size than the reference sheet size.

An image forming apparatus includes an image bearing member; an image transfer device for transferring a toner image from aid image bearing member to a sheet; an application device for applying a transfer voltage to the image transfer device; and a controller for controlling an output mode operation for outputting a predetermined chart in which test halftone toner images transferred with different transfer voltages are formed to adjust the transfer voltage. When outputting a maximum size of the chart, the controller forms the test toner images in a region within 50 mm from an edge in a width direction perpendicular to a feeding direction of the sheet.

An image forming apparatus executes an image forming operation adequately while reducing a cumbersome work of a user of setting the sheet size. A processor of the image forming apparatus controls an image forming portion to form the image on the sheet even if the sheet size included in an image forming job is inconsistent with the sheet size stored in a storage portion. In such a mode, the processor controls a notification portion so as to give notification when a size detection portion detects one of regular sheet sizes and where the sheet size included in the image forming job is inconsistent with the detected sheet size.

An image forming apparatus includes an image forming portion, first and second rotatable members, a jam detecting portion, a detector, and a controller. When a sheet to be fed to a nip is a first sheet having a first length and a first width, the controller causes the first rotatable member rotating at a first speed to feed the first sheet. When the sheet is a second sheet having is a second length shorter than the first length and having the first width, the controller causes the first rotatable member rotating at a second speed slower than the first speed to feed the second sheet. The controller stops rotation of the first rotatable member in response to detection of the occurrence of a jam by the jam detecting portion.

A printing apparatus having a copying function includes a document feeder that feeds a document, an image reading section that scans the document fed from the document feeder and generates image data of the document, a printing section that performs printing on paper in accordance with the image data, and a controller. The controller performs an avoidance process of avoiding performing the printing in which a size of a sheet of the document and a size of the paper do not match against an intention of a user, in a case where a setting is made in which the document, on which single-sided printing is performed, is printed on both sides of the paper to perform double-sided printing, and the document includes sheets having different sizes and includes an odd number of successive sheets with an identical size.

A fixing device includes a sensor driving unit that drives a temperature sensor to be movable in an axial direction of a fixing rotating body, and a sensor position control unit that controls the position of the temperature sensor by the sensor driving unit. The sensor position control unit performs sensor position control for setting a sheet size identified by a size identification unit as a reference sheet size and allowing the temperature sensor to be located within a passage area of a sheet having the reference sheet size and a non-passage area of a sheet having a sheet size smaller by one size than the reference sheet size.

The image forming apparatus includes a paper feed unit that stores print paper used for printing, a paper size sensor that detects a paper size of the print paper stored in the paper feed unit, a filter information setting unit that sets filter information indicating the paper size detected by the paper size sensor in association with the paper feed unit, and a paper catalog list generating unit that extracts a paper catalog matching the filter information from paper catalogs included in predetermined paper catalog data and generates a paper catalog list using the extracted paper catalog.

In an example implementation, a stackable component assembly includes a first stackable component with a bottom recess in its bottom surface, and a second stackable component with a top recess in its top surface. A first alignment element is installed in the bottom recess and a second alignment element is installed in the top recess. The second alignment element is nestable within the first alignment element to align the first and second stackable components upon stacking the first stackable component onto the second stackable component.