An image forming apparatus including: a toner image forming unit forming a toner image on an intermediate transfer member; a transfer member transferring the toner image on the intermediate transfer member to a recording material in a transfer portion; a driving source applying driving force to the transfer member independently of an intermediate transfer member driving source; an execution unit correcting image misalignment on the basis of a detection result of a test toner image on the intermediate transfer member when no toner image exists in the transfer portion; a container storing the recording material; and an input unit associating the container with a group related to basic weight and surface properties of the recording material. The apparatus includes a driving unit driving the driving source at a speed corresponding to the group if the recording material stored in the container associated with the group is used for image formation.

An image forming apparatus comprises a sensor which emits light with a spot diameter serving as a predetermined size to a pattern for position detection formed on a transfer medium conveyed by a conveyance section, and outputs a read signal corresponding to reflected light of the emitted light; a processing circuit which generates a differential signal obtained by differentiating the read signal output by the sensor, and outputs a signal obtained through an exclusive OR of the read signal and the differential signal obtained by differentiating the read signal; and a control section configured to specify a position at which a image forming section forms a image on the basis of the signal output by the processing circuit.

Provided is an image forming apparatus, which is capable of detecting a color misregistration amount with high accuracy even when a density characteristic thereof is changed. The image forming apparatus includes a plurality of image forming units configured to form toner images of different colors on a predetermined intermediate transfer belt, and a density sensor configured to measure densities of the toner images formed on the intermediate transfer belt. The image forming apparatus determines a density target depending on a measurement result of a density correction image, which is formed by the plurality of image forming units, from the density sensor. The image forming apparatus causes the plurality of image forming units to form position detection images so that the position detection images have densities corresponding to the density target.

An image forming apparatus capable of performing color misregistration correction at image forming speeds while reducing downtime. Image forming units form images of different colors. The formed images are transferred to an intermediate transfer belt. A pattern sensor detects color misregistration amounts of color patterns formed on the intermediate transfer belt. A CPU causes the image forming units to form first color patterns at a first speed and the pattern sensor to detect first color misregistration amounts, and causes the former to form second color patterns at a second speed different from the first speed and the latter to detect second color misregistration amounts. The CPU determines third color misregistration amounts at a third speed based on the first and second color misregistration amounts. The third speed is different from the first and second speeds.

An image forming apparatus includes an image forming device, a print object moving device configured to move a print object in a moving direction relatively to the image forming device, a detector configured to detect images formed on the print object, and a control device configured to control the image forming device to form a first plurality of marks and a second plurality of marks on the print object. The first marks are along the moving direction and the second marks are along the moving direction and to be away from the first marks in a width direction that is perpendicular to the moving direction and the second marks are smaller in number than the first marks. The control device is further configured to control the detector to detect the first marks and the second marks on the print object for detecting deviation in image forming positions.

An image forming apparatus includes upstream-side and downstream-side detection parts and a control section. The detection parts are disposed on a moving path of an intermediate transfer belt or a conveyor belt and detect a speed of the belt. The control section performs control to correct color misregistration of images composed of colors to be formed on the intermediate transfer belt or a recording medium conveyed by the conveyance belt on the basis of the detection result. The control unit calculates a difference between the speed detected by the upstream-side detection part and the speed detected by the downstream-side detection part after a predetermined time elapses since the upstream-side detection part detects the speed and performs the control on the basis of the difference. The predetermined time is obtained by dividing a distance between the detection parts by a target speed of the belt.

An image forming apparatus includes: a formation body on which a latent image is developed so that an image is formed; a transfer belt with an outer peripheral surface onto which the image formed on the formation body is transferred, the transfer belt having an annular shape; a driving roll around which the transfer belt is wound and that causes the transfer belt to revolve; a transfer body that transfers, at a transfer region between the transfer body and the transfer belt, the image from the transfer belt to a recording medium while transporting the recording medium; a drive mechanism that rotationally drives the transfer body; a detection unit that detects a predetermined rotation position of the transfer body; a writing unit that writes the latent image on the formation body based on a detection timing at which the detection unit detects the rotation position; and a speed adjustment mechanism that adjusts a rotation speed of the transfer body rotated by the drive mechanism each time the transfer body makes one rotation, that switches between a first adjustment pattern and a second adjustment pattern in which a speed profile is different from the first adjustment pattern each time the transfer body makes one rotation, and that synchronizes a switching timing, at which switching between the adjustment patterns is performed, with the detection timing.

An image forming apparatus includes a first image forming unit configured to form a first image in a chromatic color, a second image forming unit configured to form a second image in black, an intermediate transfer member, a sensor, a first adjustment unit configured to adjust the image forming position for the black based on an adjustment value, a second adjustment unit configured to adjust image forming position based on an adjustment condition, and a generation unit configured to generate the adjustment condition. The generation unit generates a first adjustment condition based on a user instruction relating to a first test image having chromatic color on a sheet input from the input unit. The generation unit generates a second adjustment condition based on the reading result of the second test image having black on a sheet from a reading device.

An image forming apparatus includes a toner image forming unit, a transfer member, and a driving source. An execution unit corrects image misalignment on the basis of a detection result of a test one image when no toner image exists in a transfer portion. An input unit associates first and second containers of recording material with either first and second groups regarding characteristics of the recording material. A setting is possible in which, if the recording material stored in the container associated with the first and second groups is used for the image formation, the driving source is driven at first and second speeds. Whether to conduct the correction before the current image formation is determined depending on the group associated with the container in which the recording material on which the previous image formation is conducted is stored.

An image forming apparatus including: a toner image forming unit forming a toner image on an intermediate transfer member; a transfer member transferring the toner image on the intermediate transfer member to a recording material in a transfer portion; a driving source applying driving force to the transfer member independently of an intermediate transfer member driving source; an execution unit correcting image misalignment on the basis of a detection result of a test toner image on the intermediate transfer member when no toner image exists in the transfer portion; a container storing the recording material; and an input unit associating the container with a group related to basic weight and surface properties of the recording material. The apparatus includes a driving unit driving the driving source at a speed corresponding to the group if the recording material stored in the container associated with the group is used for image formation.