| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a drum unit configured to easily reproduce a positional relation between a sheet and a photoreceptor drum when the sheet passes through the photoreceptor drum during image forming operation.SOLUTION: A drum unit includes: a photoreceptor drum; a frame for supporting the photoreceptor drum; a positioning unit 52 which is arranged opposite a position of a collation part 50 formed in a sheet or an end of the sheet in a photoreceptor drum axial direction at the time when the collation part 50 or the end of the sheet passes through the photoreceptor drum during image forming operation; and a guide member 51 formed of a first part 51L extending from above of the frame outside a boundary of an image forming area of the photoreceptor drum, and a second part 51B having an end supported by the first part 51L and extending in the photoreceptor drum axial direction, and causing the collation part 50 or the end of the sheet to pass between the second part 51B and the photoreceptor drum in a direction orthogonal to the photoreceptor drum axial direction so as to face the positioning unit 52.</p> |
