Patent ID: 8488996
Filing Date: 2013-07-16
Classification: G03G

Abstract:
1. A driving force transmission mechanism that is provided between a driving force supplying member having a driving source and a driving force receiving member configured to be detachably provided in the driving force supplying member, the driving force transmission mechanism configured to transmit driving force from the driving force supplying member to the driving force receiving member, the driving force transmission mechanism comprising: an input member that is rotatably provided in the driving force receiving member, the input member including a concave shape portion that receives the driving force from the driving force supplying member; a rotation driving shaft that is rotatably provided in the driving force supplying member; and a driving force transmission member that is configured to rotate in a rotation direction of the rotation driving shaft together with the rotation driving shaft, the driving force transmission member configured to be movable forward and backward relative to the driving force receiving member in a parallel direction with a rotation axis line of the rotation driving shaft, the driving force transmission member being supported by the rotation driving shaft so that a tip end portion of the driving force transmission member, which is close to the driving force receiving member, swings in a direction perpendicular to the rotation axis line of the rotation driving shaft, the driving force transmission member configured to rotate together with the input member when the tip end portion enters into and is engaged with the concave shape portion, wherein, when the driving force receiving member is mounted in the driving force supplying member, the input member has a substantially parallel rotation axis line with the rotation axis line of the rotation driving shaft; wherein, when the tip end portion does not enter into the concave shape portion, the concave shape portion has at least a portion that is overlapped with the tip end portion when viewed in the direction of the rotation axis line of the driving shaft; and wherein a protrusion is formed on a portion of a surface of the tip end portion, the surface being opposed to the concave shape portion, the protrusion is configured to be engaged, from an inner side, with an edge of the concave shape portion when the tip end portion is in contact with the edge of the concave shape portion and is tilted, the protrusion is formed on the portion that is deviated from the rotation axis line of the rotation driving shaft in a diameter direction with the rotation axis line of the input member.