DRIVE TRANSMISSION UNIT AND RECORDING DEVICE

To provide a driving force transmission structure with higher durability.SOLUTION: In a drive transmission unit, a first member, a transmission member, and a second member are coaxially rotatably provided, and the transmission member can transmit rotating force between the first member and the second member. The transmission member is provided to be displaceable in an axial direction at a non-transmission position at a first member side and a transmission position at a second member side. When the transmission member rotates in one direction at the non-transmission position, a cam structure for energizing the transmission member to the transmission position is included. When the transmission member rotates in the one direction at the transmission position, the second member and the transmission member are engaged with each other, and when the transmission member rotates in an opposite direction, the transmission member is energized to the non-transmission position and the engaging state is released. A viscous material resisting relative rotation of the transmission member for the second member is provided between the transmission member and the second member.SELECTED DRAWING: Figure 9 【課題】より耐久性の高い駆動力伝達構造を提供する。【解決手段】第一の部材、伝達部材及び第二の部材が同軸上に回転自在に設けられ、前記伝達部材が前記第一の部材と前記第二の部材との間で回転力を伝達可能な駆動伝達ユニットである。前記伝達部材は、前記第一の部材の側の非伝達位置及び前記第二の部材の側の伝達位置に軸方向に変位自在に設けられる。前記非伝達位置において前記伝達部材が一方向に回転した場合に、前記伝達部材を前記伝達位置へ付勢するカム構造を含む。前記伝達位置において前記伝達部材が前記一方向に回転した場合に前記第二の部材と前記伝達部材とが噛み合い状態となり、逆方向に回転した場合に前記伝達部材を前記非伝達位置へ付勢して噛み合い状態を解除する。前記伝達部材と前記第二の部材との間に、前記第二の部材に対する前記伝達部材の相対回転に抵抗する粘性材料を設けた。【選択図】図９