Image forming apparatus with fiber brush

An image forming apparatus comprising:

• a rotatable image bearing member;
• a developing member configured to develop an electrostatic latent image formed on the image bearing member using a developer at a developing portion;
• a transfer member configured to transfer a developer image developed by the developing member from the image bearing member to a transferred member at a transfer portion;
• and
• a brush provided with a plurality of fibers contacting the image bearing member at a position of downstream of the transfer portion and upstream of the developing portion with respect to a rotational direction of the image bearing member,
• wherein the developer remaining on the surface of the image bearing member is collected in the developing portion,
• wherein a contacting pressure expressed as a product of an average contacting pressure per one fiber in the circumference of 100 μm in diameter and an average number is equal to or more than 1.9 nN, and
• wherein a density of the fibers of the brush is equal to or more than 120 kF/inch2.