Thanks again for all good suggestions!
We are willing to evaluate different solutions. It will be interesting and will, independent of the result, be a good experience to try to make things work without electricity and motors.
We have already done some simple tests with a spring loaded gear...
Thank you, everybody for repies to my post.
As I understood that I didn't fully describe the process, I will try to clarify a few details.
I wrote: "Our idea is that the piece of plastic is pushed into a slot the full length (70mm) by hand and after release being pushed out automatically...
We are in need of a simple mechanical linear movement.
I wonder if anyone has tried making a good solution to a linear one-way motion without the use of electics? Perhaps you can give us some advice on where to start.
As it is now, we are using a DC-motor that transports a piece of 70x20mm...
