Tool protection device in a tyre assembling-disassembling machine

A protection device for tool of tyre assembling-disassembling machine, which tool (2) has one or more working slots or grooves (3) designed to slidingly engage, in use, with a peripheral edge of a wheel rim (C) located on the tyre assembling-disassembling machine. The protection device comprises a laminar body (1) designed to be seated in the working groove (3), and check means (8a, 8b) between the laminar body (1) and the tool (2) provided removably to keep in position the laminar body (1) in the working groove (3).