Patent ID: 7599643

Claim:
An image forming apparatus comprising: a corona discharger including: a case section; a stylus electrode stretched within the case section, the stylus electrode including a metal strip having a plurality of needle-shaped electrodes; and a cleaning member arranged to slidably move along a longitudinal direction of the stylus electrode such that the stylus electrode is sandwiched in the cleaning member; wherein the cleaning member includes: a movable body attached to the case section of the corona discharger so as to be movable along the longitudinal direction of the stylus electrode; a combination of a non-rotational slidably-contacting member and an axially-rotational slidably-contacting member which are respectively supported by the movable body between which the stylus electrode is sandwiched; and an urging unit interposed between the movable body and the non-rotational slidably-contacting member so as to elastically urge the non-rotational slidably-contacting member toward the axially-rotational slidably-contacting member; and positions of the two slidably-contacting members are set in such a way that a nip section between the two slidably-contacting members is closer to the non-rotational slidably-contacting member with reference to a tension line of the stylus electrode; the non-rotational slidably-contacting member is supported by the movable body so as to be movable toward the axially-rotational slidably-contacting member and non-rotatable; and the axially-rotational slidably-contacting member is supported by a bearing section of the movable body so as to be axially rotatable around a rotational support shaft arranged parallel to a surface of the stylus electrode.