Patent ID: 8016493

Claim:
A coupling configured to transmit power from a drive shaft to a driven shaft by magnetic force, the coupling comprising: a drive-side magnetic force portion including a first magnet and a first holding member holding the first magnet at a drive shaft side; a driven-side magnetic force portion including a second magnet facing the first magnet and a second holding member holding the second magnet at a driven shaft side, wherein power is transmitted by magnetic force acting between the drive-side magnetic force portion and the driven-side magnetic force portion; and buffer member located between the drive-side magnetic force portion and the driven-side magnetic force portion and concurrently in contact with both the drive-side magnetic force portion and the driven-side magnetic force portion, wherein an inertial mass around a rotational axis of the driven-side magnetic force portion is greater than an inertial mass around a rotational axis of the drive-side magnetic force portion.