LEGO 9686 Machine&Mechnism - 42. Bus wiper

Bus wiper made with science technology set. I made passenger car wipers for the last time, but I wanted to see the bus wipers work as well. Using a parallel link structure, the wiper moves in reciprocating circular motion while the wiper moves in a vertical position. The speed control is also good, but it is made by the automata method which works by moving slowly.