| 摘要 |
<P>PROBLEM TO BE SOLVED: To restrict occurrence of defective image formation even when dimensional variations of gears occur. <P>SOLUTION: An image formation apparatus is constituted in the following manner. When a first drum specific position ▵ is positioned at a transfer position, a first drive specific tooth ○ is engaged with a first drum gear A1; when a second drum specific position ▵ is positioned at the transfer position, a first drive specific tooth ○ is engaged with a second drum gear A2; moreover when a third drum specific position ▵ is positioned at the transfer position, a second drive specific tooth ○ is engaged with a third drum gear A3; and when a fourth drum specific position ▵ is positioned at the transfer position, the second drive specific tooth ○ is engaged with a fourth drum gear A4. When a reference tooth of the first drum gear A1 is positioned at the transfer position, a reference tooth of the second drum gear A2 is in a state shifted from the transfer position by a first shift angle, a reference tooth of the third drum gear A3 is in a state shifted from the transfer position by a second shift angle, and a reference tooth of the fourth drum gear A4 is in a state shifted from the transfer position by a third shift angle. <P>COPYRIGHT: (C)2013,JPO&INPIT |
