Looks like it's had water in it and the mechanism is rusted up. I think this would need a complete dismantling to save it.
What I can see from your pictures is that the shutter is cocked and that's why the film wind-on is locked. I can also see that the shutter release rod is pressed down. Not quite all the way but it is down to the point where it should begin to trip the shutter. The normal operation is that the aperture starts at its smallest size. As the shutter release is pressed the aperture opens out to whatever aperture is required, then the shutter is released.
Does the shutter release button move at all? If it does you may be able to see the aperture opening by looking in the back of the lens while pressing the button. The button just needs to go in further to trip the shutter. If the release button isn't moving at all then that's your problem and you need to free it. I think you'll have to remove the lens assembly to do it though. I'll see if I can find some pictures that might help.
The brass gears are the self timer and won't effect the anything as long as you don't try and set it.
Edit: Found a few of pictures that might help.
Look at the position of the shutter release rod compared to yours and also the horizontal rod that crosses it. The horizontal one cocks the shutter.
To remove the lens assembly you need to first remove the rangefinder and the meter. These are the three screws that release the meter assembly.
I don't have a picture showing the four screws that hold the lens plate in place but here's the bare chassis with the positions marked. To get at the one at the top right you may have to remove the rangefinder coupling lever first.
Second edit:
Before spending any more time on this, you might want to check out the meter first. With a battery installed you should be able to get the meter to move. Dead meter cells or disintegrated ISO potentiometer tracks are a poroblem with these and (I know from experience) it's frustrating to fix all the mechanical problems only to then find the meter's dead.
