Sheet detection device and image forming apparatus

A sheet detection device comprising:

• a measurement unit for measuring a feature amount of a sheet conveyed by a conveyance unit;
• a pressing member movable between a first position separated from the measurement unit and a second position closer to the measurement unit than the first position;
• and
• a moving unit configured to move the pressing member,
• wherein the moving unit is configured to move the pressing member from the first position to the second position in a case where an initial adjustment of the measurement unit is executed under a state in which a sheet has not been conveyed to a measurement position of the measurement unit,
• wherein the measurement unit is configured to execute the initial adjustment under a state in which the pressing member is arranged at the second position,
• wherein the moving unit is configured to move the pressing member from the second position to the first position after the initial adjustment is executed,
• wherein, after the initial adjustment is executed, the pressing member is arranged at the first position in a case where the sheet has not been conveyed to the measurement position of the measurement unit by the conveyance unit,
• wherein the moving unit is configured to move the pressing member from the first position to the second position in a case where the sheet has been conveyed to the measurement position of the measurement unit by the conveyance unit, and
• wherein the measurement unit is configured to measure the feature amount of the sheet under a state in which the pressing member is arranged at the second position.