If we talk about factories, then we can see different machines.What kind of machines will be in the factory depends on the type of clothing that the factory specializes in.
Every industrial sewing machine makes one specific stitch (for example, a straight stitch or a zigzag stitch) or a programmed function (for example, sewing on buttons, sewing a pocket, overcasting, etc.).
For fun, watch videos from the YouTube channel of the Juki brand. The videos show industrial machines.
If you are curious to know more about industrial machines here *Juki catalog
I like the equipment of this brand, the combination of cost and quality is very good.