Image forming system

An image forming system, comprising:

• an image forming unit configured to form an image on a first sheet;
• a transparent member;
• a reading sensor configured to read the image on the sheet, which is conveyed from the image forming apparatus, through the transparent member at a reading position in a conveyance direction in which the sheet is conveyed;
• an opposed roller, which is provided at the reading position in the conveyance direction, and is provided on a side opposite to the reading sensor with respect to the transparent member, wherein the sheet is nipped by the opposed roller and the transparent member in a gap between the opposed roller and the transparent member and the opposed roller receives a rotational drive force from a driving source so as to be rotationally driven to convey the sheet which is nipped by the opposed roller;
• a changing unit configured to change a size of the gap;
• and
• at least one processor configured to:
• acquire information related to a thickness of the first sheet;
• control the changing unit so that the size of the gap becomes a first size in a case where the thickness of the first sheet is a first thickness, and control the changing unit so that the size of the gap becomes a second size larger than the first size in a case where the thickness of the first sheet is a second thickness larger than the first thickness;
• and
• set an image forming condition for forming an image on a second sheet based on image data obtained by the reading sensor.

An image reading apparatus configured to read an image on a sheet conveyed from an image forming apparatus which is configured to form the image on the sheet, the image reading apparatus comprising:

• a transparent member;
• a reading sensor configured to read the image on the sheet, which is conveyed from the image forming apparatus, through the transparent member at a reading position in a conveyance direction in which the sheet is conveyed;
• an opposed roller, which is provided at the reading position in the conveyance direction, and is provided on a side opposite to the reading sensor with respect to the transparent member, wherein the sheet is nipped by the opposed roller and the transparent member in a gap between the opposed roller and the transparent member;
• a rotary shaft configured to rotate the opposed roller;
• and
• a cam configured to change the gap,
• the cam being supported coaxially on the rotary shaft.