Interesting guess, but no.
Related to envelopes, but not for folding.
Spot on.
Answer
It's for pushing mail into an envelope. Three or four of them work in unison to push a stack of papers/inserts into an envelope.
Lol, that's a no. It's for an industrial machine.
More of a "put all of this stuff together in one package" sorta machine. The wear piece does push something while riding in the tracks. Technically the tracks do have various depths, but that's not too important to the general function of the assembly.
There is no cam type function in the machine. The assembly is solidly attached to the bar that moves.
The bar is aluminum and the square ish piece on the left is low friction plastic.
Closest guess so far! The track is correct. Not for manufacturing per-say, but definitely a complex machine.
Lol. It's not car related. This is for a larger stationary machine.
Not quite. The assembly moves around for other reasons.
Other comment guessed the same thing. The bar controls where the assembly goes instead.
Pushing is correct :)
That's actually getting pretty close. The main difference is that the roles are reversed: The attachment point controls where the assembly goes.
I figured it would be a tough one.
These are mail insertion machines I worked on for several months as a mechanic. It's a little blurry since that were moving, but here it is in action: