Exactly....
I disagree that "anything that would simplifies work or saves time" is a machine, it's just to wide a definition.
I think I have an infinite amount of examples, but the fact that you are asking for an example makes me think we are going to have a problem over definition. Not sure how I want to proceed on this one so I'm just going to throw one out there and see what happens. Book.Any examples showing anything that simplifies work or saves time, which is an elaboration of anything that reduces human effort, is too wide a definition of machine?
If the definition is too sparse...a machine that doesn't fit the definition?