What do you call the type of printer that uses the Z axis to raise/lower the bed?

[fcwilt]

The ones that run on rails and either raise or lower the bed or raise or lower the print head while moving the bed are generally called Cartesian style 3d printers.
No idea if anyone has bothered to divide them into categories and give the categories silly names or not :-)

Thanks much.

It would make searching for a given style easier if they had names of some sort. I was looking to buy a printer that moved the bed along the Z-axis and couldn't figure out a google search that yielded the desired results.

Frederick