As a newbie in physics I imagine this device and I would like to know why it can't increase its energy.

The device:

I imagine 7 gears in rotation around blue axis in clockwise. Each gear has a mass $m$. In the same time, gears are turning at $w2$ around themselves. One clockwise next one counterclockwise like gears. But like I have 7 gears (odd number), 2 gears rotate in the same direction (2 red gears at bottom). So, between these gears I would like only friction. This friction give heating and forces $F1$ and $F2$, others gears give forces too, $F3$, $F4$ etc. I try to draw all forces but maybe I'm wrong. For me, each magenta axis receive a clockwise torque from forces $F5$, $F6$ etc. that increases $w1$ but in the same time each gear decreases its kinetic energy. Sure, like that energy seems constant.

But: Now, if I want I can take a gear (or 5 gears except 2 reds where there is friction) without mass (or very low in practise). In this case, kinetic energy can't decrease for one gear (or five), but there is the same torque from forces $F5$, $F6$ and others on blue axis. In this case how energy can be the same (I count all energies, heating too)?

The cycle is:

1. I launch gears at $w1$ and $w2$ without friction between red/red gears, this step need the energy $E$
2. I set friction ON between red/red gears
3. I count all energies, $E$ must be constant. I'm interesting about the transcient analysis when there is friction between red/red gears. From time $t=0$ to $t=t_x$, with $t_x$ very small.

How $E$ could be constant?

I add an image for understand how gears are with the support:

Note:

I guess no friction elsewhere than red/red gears surface.

I don't believe in perpetuum mobile but I imagine devices, and like puzzles to resolve, I try to understand how the sum of energy is conserved, like that I learn physics in the same time. It's like a game for me.