A mechanism for holding an article. The mechanism includes a rotatable member, at least two holding members and a sensor. The rotatable member is rotatably mounted below a base and controlled by a motor to rotate around a vertical rotation axis. The holding members are each mechanically linked by a connecting member to the rotatable member. The rotation of the rotatable member in a first direction moves the holding member from a rest position to a holding position and rotation of the rotatable member in a second direction moves the holding member to the rest position. The sensor is arranged on the base and adapted to sense the article in proximity. The sensor upon sensing the article rotates the rotatable member in the first direction to move the holding members to the holding position and rotates the rotatable member in the second direction upon removal the article from the base.