Reel unit apparatus with sensor detecting reel rotation through openings in movable base at plural positions thereof

摘要

A rotator moving apparatus has a supporting mechanism for rotatably supporting a rotator. A moving mechanism moves the supporting mechanism to a plurality of positions. A base supports the moving mechanism. An object to be detected is arranged on the rotator. A detecting section is arranged on the base so as to detect the object. A regulation mechanism regulates a plurality of positions to which the supporting mechanism moves so that the rotation path of the object falls within the range which faces the detecting section.