An image forming apparatus includes an image-carrying member, a transfer portion, a movement processing portion, and a determination processing portion. The image-carrying member conveys a toner image including a to-be-transferred toner image. The transfer portion transfers the to-be-transferred toner image onto a sheet that comes into contact with the image-carrying member. The movement processing portion causes a formation target image corresponding to the to-be-transferred toner image, that is included in image data used for forming the toner image, to move within the image data. The determination processing portion determines whether or not the to-be-transferred toner image that is based on the moved formation target image will stick out from a contact area of the image-carrying member that comes into contact with the sheet.

An image forming apparatus includes a first image processing portion and a second image processing portion. In a double-sided printing process that forms a print image on a front side and a back side of a sheet, the first image processing portion executes a print image forming process corresponding to the front side and the print image forming process corresponding to the back side under different image forming conditions. In a case in which a detection image forming process is executed during execution of the double-sided printing process, the second image processing portion executes the detection image forming process only under the image forming conditions in the print image forming process corresponding to a predetermined one of the front side and the back side.

An image forming apparatus includes photoconductor drums, an endless belt, a sensor including a light-emitting unit and a light-receiving unit, a light emission adjustment circuit configured to change a light emission amount of the light-emitting unit in response to a control signal, a comparator circuit configured to compare a light reception signal level with a threshold level, and to output a comparison result signal indicating that the light reception signal level exceeds the threshold level, and a controller. The controller is configured to perform a light amount adjustment process of sequentially outputting the control signals with updating the adjustment value from an initial value by a search width, and determining an adjustment value that the light reception signal level exceeds the threshold level, and to set at least one of the initial value or the search width according to a deterioration state of the endless belt.

According to an embodiment, an image forming apparatus executes, if an execution frequency setting of positional deviation correction in setting information is equal to or larger than a reference value, the positional deviation correction by using an image pattern for positional deviation measurement that is formed to be equal to or larger than one cycle of a transfer belt. Further, the image forming apparatus executes, if the execution frequency setting of the positional deviation correction in the setting information is less than the reference value, the positional deviation correction by using an image pattern for positional deviation measurement that is formed to be smaller than one cycle of the transfer belt.

An image forming apparatus includes an image bearing member, a voltage applying portion, a feeding portion, a detecting portion, a storing portion, a controller for controlling a first operation in which on the basis of a detection result of the detecting portion, a kind of the recording material set in the feeding portion is stored in the storing portion, and a second operation in which an adjusting chart is outputted for adjusting a transfer voltage; and an inputting portion. In response to a single start instruction, the controller is capable of carrying out control so as to execute the first operation and the second operation for outputting the adjusting chart prepared by transferring a plurality of test images onto the recording material from which an index interrelating with the kind of the recording material is detected by the detecting portion in the first operation.

An optical detecting apparatus includes a substrate having a surface, on which a light emitter and a first light receiver are arranged, and a housing. The housing has a fixture surface, onto which the surface of the substrate is fixed, and an attachable surface on a side opposite to the fixture surface. The housing includes an emitted-light guiding path formed through the housing between the fixture surface and the attachable surface for light emitted from the light emitter to pass there-through and a first receiving-light guiding path formed through the housing between the fixture surface and the attachable surface for light to be received by the first light receiver to pass there-through. The housing includes an attachable portion formed on the attachable surface. The attachable portion protrudes in a direction to extend away from the substrate.

An image forming apparatus is configured to, based on a reading result of a test image, generate data that is used to adjust image forming positions of toner images to be formed by an image forming unit, control an image forming position of a first toner image to be formed by the image forming unit in a first contact state based on first data, the first toner image being transferred to a first sheet, and control an image forming position of a second toner image to be formed by the image forming unit in a second contact state based on second data that is different from the first data, the second toner image being transferred to a second sheet, wherein a type of the second sheet is the same type as the type of the first sheet.

When the dimension of a primary transfer roller in the width direction is represented by Wa, the dimension of a counter-sensor member in the width direction is represented by Wb, the dimension of an intermediate transfer belt in the width direction is represented by Wc, and the maximum dimension of a sheet in the width direction is represented by Wd, then the relationship WdWa<WbWc is fulfilled. The transfer position of a test pattern image is a position a predetermined distance away, inward in the width direction, from the edge of the intermediate transfer belt in the width direction. The predetermined distance is twice or more the distance in the width direction from the edge of the intermediate transfer belt in the width direction to the edge of the primary transfer roller in the width direction.

An image forming apparatus includes an image forming unit including a photosensitive member, a light source, and a developing roller, and a controller configured to control the image forming unit to form a detection image, obtain density data regarding density levels in a plurality of areas in the detection image at a plurality of positions in a scanning direction in which the photosensitive member is scanned with the light from the light source, generate, based on the density data, a first image forming condition for forming a first test image and a second image forming condition for forming a second test image, the second image forming condition being different from the first image forming condition, and control the image forming unit to form the first test image and the second test image, respectively based on the first image forming condition and the second image forming condition.

A system including a printer which performs printing on a recording medium according to a print job includes a display configured to display information, acquires first color tones, on a member halfway through print processing, of at least a first print job and a second print job, and acquires second color tones, on the recording medium subjected to printing, of at least the first print job and the second print job, wherein the display displays first color information that is based on the first color tones of at least the first print job and the second print job and second color information that is based on the second color tones of at least the first print job and the second print job.