“Not-Gate” in Minecraft

This is the input lane which should be inverted.
nicht_gatter-1

Add a block to its end.
nicht_gatter-2

Place a redstone torch at the oposite side of the block.
nicht_gatter-3

Create your output-lane.
The output lane is the negative of the input lane: So if input=1 -> output=0; if input=0 -> output=1.
nicht_gatter-4