| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an image-forming device which efficiently confirms an operation of a pressure contact/separation means to/from an intermediate transfer body by detecting the density of a patch image formed on the intermediate transfer body with a density sensor. <P>SOLUTION: In a printer 100A, three toner patches are primary-transferred successively to an intermediate transfer belt 2. Here, after the first toner patch passes through a belt cleaner 5 and before the second toner patch reaches the belt cleaner 5, and after the second toner patch passes through the belt cleaner 5 and before the third patch reaches the belt cleaner 5, the belt cleaner 5 is operated to change the state of contact to the intermediate transfer belt 2 to a different state. A density sensor 18 detects density of the toner image on the intermediate transfer belt 2, and presence/absence of the toner patch is detected. When presence/absence of the first to third patches is detected alternately, the printer 100A determines that the belt cleaner 5 is performing the operation described above. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
