Centrifugal barrel polishing machine and centrifugal barrel polishing method

A centrifugal barrel polishing machine, comprising:

• a rotatable turret;
• a plurality of rotary tanks that are provided at eccentric positions of the turret and planetarily rotate with a rotation of the turret;
• barrel lids that are attachable to and detachable from the rotary tanks;
• and
• a plurality of fixation means that are provided individually in the plurality of rotary tanks so as to planetarily rotate integrally with the rotary tanks,
• wherein each of the plurality of fixation means is displaceable between in a fixing form for fixing the barrel lid attached to the rotary tank and in a releasing form for releasing the fixation of the barrel lid to the rotary tank in a state where the barrel lid is attached to the rotary tank,
• wherein it is detected by a first detection means whether the rotary tank is positioned in a detection area set on a revolution path of the rotary tank, and
• wherein it is detected by a second detection means whether the fixation means of the rotary tank positioned in the detection area is in the fixing form or in the releasing form,
• wherein the second detection means has a light emitting unit that irradiates the fixation means with detection light in parallel to a tangential direction of the revolution path of the rotary tank, and
• wherein the rotation of the turret is stopped on the condition that the second detection means has detected that the fixation means positioned in the detection area is not displaced to the fixing form.