Switching mechanism, flow passage switching mechanism, and liquid ejecting apparatus

A switching mechanism, comprising:

• a first rotating body that performs forward rotation and reverse rotation by receiving a driving force transmitted from a driving source;
• and
• a second rotating body that rotates around a center of rotation of the first rotating body and has a plurality of convex portions provided on an outer circumference at intervals in a direction of rotation;
• wherein
• the first rotating body has an engagement portion configured to move along the outer circumference of the second rotating body,
• when the first rotating body rotates in a forward direction, engagement of the engagement portion with the convex portion causes rotation of the second rotating body in the forward direction together with the first rotating body,
• when the first rotating body rotates in a reverse direction, the engagement portion moves along the outer circumference of the second rotating body so that the second rotating body does not rotate in the reverse direction,
• a rotational position of the second rotating body is switched into a predetermined rotational position by causing the first rotating body, driven by the driving source, to execute forward-and-reverse rotational operation, in which forward rotation and reverse rotation are performed sequentially,
• a first interval, which is at least one of the intervals, is larger than other intervals,
• a central angle formed with respect to the center of rotation by two convex portions forming the first interval is defined as a first angle, and largest one of central angles formed with respect to the center of rotation by respective two convex portions forming the other intervals is defined as a second angle, and
• given above definition, the driving source causes the first rotating body to perform forward-and-reverse rotational operation repeatedly by a rotation angle that is smaller than the first angle and is not smaller than the second angle, thereby positioning the engagement portion into the first interval.