Patent ID: 7773894
Filing Date: 2010-08-10
Classification: G03G

Abstract:
1. An image forming apparatus comprising: an image bearing belt configured to bear a toner image; a driving roller configured to rotationally drive the image bearing belt; first and second image forming units configured to form toner images on the image bearing belt; a first sensor configured to detect a mark on the image bearing belt; a second sensor provided on a position different from that of the first sensor in a rotation direction of the image bearing belt, the second sensor being configured to detect the mark; a supporting member configured to support the first and second sensors; a temperature detecting unit configured to detect temperature within the image forming apparatus; and a rotational speed adjusting unit configured to adjust a rotational speed of the driving roller, based on detection results of the first and second sensors and of the temperature detecting unit, wherein the first sensor is provided upstream of the second sensor in the rotation direction of the image bearing belt, and wherein the rotational speed adjusting unit adjusts the rotational speed of the driving roller, based on an amount of time from the first sensor detecting the mark to the second sensor detecting the mark, by correcting information relating to the distance between the first sensor and the second sensor in the rotation direction of the image bearing belt, based on detection results of the temperature detecting unit.