Patent ID: 7223176

Claim:
A torque transmission system for transmitting a torque from a driving unit to a rotation unit, the system comprising: a first rotating member rotated by receiving the torque by the driving unit; second rotating member that is connected to a rotating portion of the rotation unit, rotated along with the rotation portion, and disposed coaxially with the first rotating member; and a first protruding portion protruding from the first rotating member to towards the second rotating member; a second protruding portion protruding from the second rotating member towards the first rotating member, wherein the first protruding portion and second protruding portion are meshed with each other; a first elastic member that is elastically transformable; and a second elastic member that is elastically transformable, wherein the first protruding portion and the second protruding portion provide (i) a pair of first faces, which sandwich the first elastic member and transmit only a normal rotational torque from the first rotating member to the second rotating member, and (ii) a pair of second faces, which sandwich the second elastic member and transmit only a reverse rotational torque from the first rotating member to the second rotating member, wherein the second elastic member is disposed to be apart with a gap from at least one face of the second faces when the first elastic member contacts both the first faces in a state where a compressed transformation is zero, and wherein even when the first rotating member is rotated in a reverse rotation direction, no reverse rotational torque is transmitted to the second rotating member as long as the gap exists.