It is about a group of kids who have robot machines they control to defeat a certain fairy tale story??

Maybe,.

Time Fighters (http://www.anime-games.co.uk/VHS/anime/timefighters.php)
a.k.a. Time Fighters In the Land of Fantasy
a.k.a. Time Bokan

Thanks that is the exact movie I was looking for watched when I was a kid (Time Fighters in the Land of Fantasy) Thought my kid would like thanks once again