IMAGE FORMING APPARATUS

摘要

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.

主权项

1. An image forming apparatus, comprising;
an image forming unit configured to form a toner image; a toner bearing member configured to bear the toner image formed by the image forming unit; a transfer member configured to form a transfer nip with the toner bearing member for nipping a recording material and to transfer the toner image born by the toner bearing member to the recording material; a speed control unit configured to control a speed of the transfer member and the toner bearing member, the speed control unit being capable of changing a speed difference between the transfer member and the toner bearing member based on a type of the recording material; a control unit configured to, if the speed difference between the transfer member and the toner bearing member is changed during continuous image formation job, form a registration patch in the toner bearing member based on a changed amount of the speed difference between the transfer member and the toner bearing member, and execute a registration correction mode in which an image formation condition of the image forming unit is controlled on the basis of the registration patch, the control unit executing the registration correction mode if a changed amount of speed by the speed control unit exceeds a predetermined range, and not executing the registration correction mode if the changed amount of speed by the speed control unit does not exceed the predetermined range; and an input unit configured to input a signal for setting an image formation mode, wherein the control unit controls an image formation during the image formation mode so that the changed amount of speed by the speed control unit is limited to the predetermined range regardless of a type of the recording material and the registration correction mode is not executed during continuous image formation.