Tractor feed has nothing to do with the type of printhead.
My old Okidata Microline 390 dot-matrix printer has a detachable tractor feed. I can use it or not, depending on the media I'm printing on.
Tractor feed and platen.
pin-feed paper
A dot matrix printer uses continuous, fan-fold paper. Such paper is fed through the printer by pegs on a roller engaging holes along both edges of the paper.
Known as a tractor feed, in which a roller with pegs that engage in holes punched along both edges of the paper, is used to move the paper through the printer. The paper used is normally continuous fan-fold listing paper. The second type of dot matrix is one that has rubber rollers instead of a tractor feed. Here, single sheets or two sheets with a carbon sheet in between, can be either hand fed or auto fed from a paper tray. A detachable tractor feed tool can be fitted if continuous listing paper is to be also used on this type of dot matrix printer.
A dot matrix is an impact printer. A scanner is not a printer.
impact technology
A thermal printer and a laser printer are non-impact printers. A dot matrix, that fires pins against an inked roller, and uses a tractor roller to feed continuous paper through the printer, is an example of an impact printer.
Continuous Forms
shuttle-matrix printer is high speed printer that works like dot-matrix printer.
A line matrix is a type of printer which is a compromise between a dot matrix printer and a line printer.
dot-matrix
Dot Matrix Printer is the cheapest printing cost.