| 摘要 |
PURPOSE: To enable color matching correction for the color slippage according to the change of the drive force between each component due to the aging factor of a printer generated over a long range, by correcting the speed difference of a photosensitive body and an intermediate transfer body based on the information stored in an information storage means. CONSTITUTION: Based on the signal from a detection means 224 detecting a specified location which is always generated while an intermediate transfer body 221 rotates, the detection of rotation speed is arbitrarily executed and the convergence rotation speed of the intermediate transfer body 221 measured by using the rotation speed measuring means (270) of the intermediate transfer body 221 which is possible to be stopped is held in an information storage means (270) which is capable of holding the speed also when the power of a printer is turned off. By using the information in this information storage means (270), the difference of the convergence rotation speed for reference rotation speed of color slippage amount can be made clear. Further, if the information for a certain time is held, the degree of the color slippage within the convergence rotation speed for the long period of the printer can be recognized and can be adjusted. |
