> Neither the print ball (if there was one), the printwheel, nor the typebars moved.
Certainly the head moved on most if not all ball/cylinder/wheel devices. Look at the Selectrics, Teletype 33, the Diablo/Xerox/Qume terminals, as common examples.
I have never seen a Selectric in which the ball moved instead of the carriage. I can't imagine how complicated the mechanics would be for that and how often it would jam, break, or malfunction. Certainly not something a company such as IBM would make their reputation on. I used many Selectrics in my time.
Certainly the head moved on most if not all ball/cylinder/wheel devices. Look at the Selectrics, Teletype 33, the Diablo/Xerox/Qume terminals, as common examples.