Developing device, process cartridge and image forming apparatus that prevent toner leakage

  • US 6,212,343 B1
  • Filed: 10/22/1999
  • Issued: 04/03/2001
  • Est. Priority Date: 10/22/1998
  • Status: Expired due to Term
First Claim
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1. A developing device, comprisinga developing roller opposed to a photoconductor and rotatably mounted to a developing case of the developing device, a blade mounting surface formed in an outer wall of the developing case, that is opposed to the photoconductor, a blade holder, a blade and a supporting member, laminated with each other, and mounted to the blade mounting surface of the developing case, a first part of the blade located opposite to a second part of the blade, which is sandwiched between the blade holder and the supporting member, and elastically bent so as to contact an outer circumferential surface of the developing roller, and seal members arranged at least along an edge of a longitudinal side of the blade holder at a side of the developing roller and along an edge of another longitudinal side of the blade holder at an opposite side of the developing roller, respectively, so as to increase airtightness of gaps between the blade holder and the outer wall of the developing case.

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