Patent ID: 8081907

Claim:
A developer feeding apparatus, comprising: a developer feeding member rotatably provided to feed a developer; and a driving force transmission unit for transmitting a driving force to the developer feeding member, wherein the driving force transmission unit includes: a first driving force transmission member rotatably provided with a first rotation axis and having a first conic surface inclined toward the first rotation axis to have the driving force transmitted from a drive source; a second driving force transmission member rotatably provided with a second rotation axis parallel to the first rotation axis and having a second conic surface inclined toward the second rotation axis with a constant interval to the first conic surface to transmit the driving force to the developer feeding member; a third driving force transmission member rotatably provided in pressure-contact with each of the first conic surface and the second conic surface to transmit the driving force between the first driving force transmission member and the second driving force transmission member; and a moving unit for enabling the third driving force transmission member to move so that a size of a diameter of the first conic surface at a position in pressure-contact with the third driving force transmission member and a size of a diameter of the second conic surface at a position in pressure-contact with the third driving force transmission member change in accordance with rotation of the first driving force transmission member or the second driving force transmission member, wherein the moving unit includes: an axis member provided parallel to each of the first conic surface and the second conic surface to rotatably hold the third driving force transmission member; and a movable member rotatably provided with the axis member so as to be movable in an axial direction of the axis member with a rotation operation, wherein the third driving force transmission member is moved by the movable member being moved in the axial direction of the axis member by being rotated in accordance with rotation of the first driving force transmission member or the second driving force transmission member, wherein a rotational speed of the developer feeding member is changed in accordance with a change in a number of revolutions of the first driving force transmission member by the movement of the third driving force transmission member.