Device for measuring tire ground state

A device for measuring a tire ground state comprising:

• a traveling surface;
• a tire drive unit which grounds a tire on the traveling surface and rolls the tire;
• a measuring sheet which is mounted to a partial area of the traveling surface and is provided for measuring the tire ground state;
• a protection sheet which covers the measuring sheet;
• and
• a backward and forward tensile force application mechanism which applies a tensile force along a tire forward traveling direction to the protection sheet,
• wherein a space conducting the protection sheet to a portion below the traveling surface is formed in at least one of a delay side and an advance side of the measuring sheet in the tire forward traveling direction on the traveling surface, and the backward and forward tensile force application mechanism is structured such as to pull at least one end of the protection sheet in the tire forward traveling direction from the below of the traveling surface, and
• wherein an upper opening of the space is partly closed by an upper lid which is arranged so as to be flush with the traveling surface.