Patent ID: 7251435

Claim:
A developing device for developing a latent image by obtaining developer from an opening section of a developer tank by a developing roller that is provided in a printing device, covering the opening section from outside of the developer tank, wherein: the developing device comprises: a seal mechanism for sealing a gap between the developing roller and the opening section, the seal mechanism including (a) side seals provided on both lateral sides of the opening section while being in contact with the developing roller, and (b) a front seal board whose one side covers an edge of the opening section and is fixed thereto, which edge extends in a longitudinal direction of the developing roller, the front seal board being configured to contact a surface of the developing roller between the opening section and the developing roller, and the front seal board being fixed to the side seals at its end sections, each of the side seals comprises a urethane foam and a flocked fabric laminated on the urethane foam, the flocked fabric being in contact with the developing roller.