Sheet conveyance device and image forming system

A sheet conveyance device for conveying a sheet, the sheet conveyance device comprising:

• a center shaft;
• a driving portion configured to output a driving force;
• and
• a rotatable member provided with an engaging hole configured to engage with the center shaft, a drive coupling portion disposed on an outer diameter side of the engaging hole and coupled to the driving portion, and a restricting portion disposed on the outer diameter side of the engaging hole and configured to restrict movement of a moving member,
• wherein the rotatable member changes a position of the restricting portion by being rotated between a first position and a second position rotated from the first position about the center shaft by driving of the driving portion, and
• wherein as viewed in an axial direction of the center shaft, a position of a center of gravity of the rotatable member is positioned in an inner diameter side of an inner diameter surface of the engaging hole.