Sheet thickness detection device and image forming apparatus

A sheet thickness detection device for detecting a thickness of a sheet being conveyed, comprising:

• a conveyance unit configured to convey a sheet along a conveyance path;
• a displacement member configured to be displaced to follow a thickness of the sheet being conveyed;
• a displacement amount detection unit configured to detect an amount of displacement of said displacement member with a plurality of different sensitivities;
• a sensitivity changeover unit configured to change a sensitivity of said displacement amount detection unit;
• and
• a sheet thickness detection unit configured to detect the thickness of the sheet based on a result of detection by said displacement amount detection unit with the sensitivity changed by said sensitivity changeover unit.

A sheet thickness detection device for detecting a thickness of a sheet being conveyed, comprising:

• a conveyance unit configured to convey a sheet along a conveyance path;
• a displacement member configured to be displaced to follow a thickness of the sheet being conveyed;
• a displacement amount detection unit configured to detect an amount of displacement of said displacement member at plural positions with different degrees of amplification by which the amount of displacement is amplified;
• a sensitivity changeover unit configured to change a sensitivity of said displacement amount detection unit;
• and
• a sheet thickness detection unit configured to detect the thickness of the sheet based on a result of detection by said displacement amount detection unit in the at least one of the plural positions with the sensitivity changed by said sensitivity changeover unit.