Image carrying member unit and image forming apparatus therewith

An image carrying member unit, comprising:

• an image carrying member that is rotatable, the image carrying member having a toner image formed on an outer circumferential surface thereof, and
• a cleaning device including:
• a cleaning blade that makes line contact with the outer circumferential surface of the image carrying member under a predetermined pressure, the cleaning blade being formed of an elastic material in a shape of a rectangular parallelepiped and scraping off residual toner on the image carrying member, and
• a supporting member to which the cleaning blade is fixed in a state projecting upstream in a rotational direction of the image carrying member,
• wherein
• when a free length over which the cleaning blade projects from the support member is L [mm], a thickness of the cleaning blade is t [mm], and a contact pressure of the cleaning blade against the image carrying member is W [gf/cm], then Formulas (1) and (2) below are satisfied.
• 7.5
• *
• (
• L
• /
• t
• )
• -
• 23.9
• ≤
• W
• ≤
• 24
• (
• 1
• )
• 12
• ≤
• W
• (
• 2
• )