so can you explain to us how this works

You need one loader for loading iron ore ore copper ore, one furnace from this mod and the one loader for unloading (press R for reverse loader to unloader).

It can be overpowered, you are need protect it, see forum https://forums.factorio.com/viewtopic.php?f=6&t=29188

Loaders are hidden vanilla and don't need any scripting. First furnace had speed and power coefficient = 42. It is the same speed like the double sided yellow transport belt.

i cant get the loader loading ores into furnance, no matter from which direction i try :(.. Can U give a exacter eplanation, how to set up it correctly?
I only manage to UNLOAD the furnance with a loader

Can you make a screenshot of your trying? Normally it works by itself, but you must protect it from overloading.

Can you make a screenshot of your trying? Normally it works by itself, but you must protect it from overloading.
http://images.akamai.steamusercontent.com/ugc/493528961510440968/5755A7EF2FFF2F18AAB3E698B39B4BA016787DAC/

You are forget about unloaders. (key R on loader)

http://i.imgur.com/aONtp9z.jpg

Wouldn't it have been easier to tell the player having trouble that flat side must go against object to be loaded/unloaded and side with belt pointing away? Then they can change the flow direction by the R key.