Poka Yoka

Poka is a Japanese world meaning Cand Yoke comes from Japanese word Yokerie meaning “to avoid ‘. this has idea behind Poka Yoke is to free a person’s mind from maintaining repetitive vigil which may be practically infeasible . by doing so a person without the fear of making mistake can constructively do more value added activities.
Errors are inevitable but can be Eliminated
People always make mistakes. these can be reduced or even eliminated. some of the poke-yoke devices, which can help avoid defects, are
•guide pins/locators of different sizes.
•error detection Buzzers and Alarms
•limit Switches, Proximity switches and photo sensors .
•counters checklists
Prediction v/s Detection
when a poka –yoke is designed in a way that it helps the operator to recognise the defect before it is about to occur, it is called a prevention or prediction type poke-yoke
When a poka-yoke helps the operator to know immediately on the occurrence of the defect then it is called detection type poka-yoke detection is “after”the defect is produced the merit of this type of poka-yoka is based on the stage at which the defect is detected in simple language “Earlier the better”.