Automaton - Dancing Koala

I finally finished making my 6th automaton yesterday.

Originally, I was going to make a complicated design automation, but I thought that it seemed difficult to make it. So, I've decided to make it step by step.

Therefore, this automaton is a part of an automaton that I want to make in the end. I have made it for making sure whether those gears work well.
The feature of this automaton is two gears that have only four teeth.

These gears make the other gear that is connected to a rack always rotating the same, which means the gear turns the opposite direction on the way and it makes the rack swing side to side. Even those gears with four teeth rotate the opposite way, but the rack swings the same.

At first, I made a mistake with these gears that have four teeth. After I tried to rotate them, I noticed that I had to cut two teeth at each end of these gears a little otherwise the gears mesh with each other and get stuck.

I thought it did not look good with only gears, so I have made a koala doll on the rack.

The koala legs are connected to the rack and his legs, arms and head can move a little bit like he's dancing.
I had just added the koala for fun without thinking too much, but it was a bit difficult to attach him to the rack and a back board. Thinking about the movement of the koala, I should have used a steel washer between the back board and the koala. If I had used steel washers, the koala could have taken a more brilliant step, I guess.

It was disappointing that I could not hit on using steel washers, but it was a good try that I could make sure this mechanism works.

My next target is an automaton that I really wanted to make, but I know it is arduous. It is an automaton with a pendulum. I hope I am able to show you pictures or videos of my next automaton someday.