Sheet conveying device and image forming apparatus

A sheet conveying device comprising:

• a separation sheet feeding mechanism having a paper feeding belt and a separation roller, when there are not only a sheet which is in contact with the paper feeding belt and is to be fed but also a subsequent sheet in contact with the separation roller, the separation sheet feeding mechanism uses the feeding belt to feed the sheet which is to be fed, and uses the separation roller to separate the subsequent sheet from the sheet which is to be fed;
• and
• an adjustment mechanism that changes contact state of the paper feeding belt to the separation roller by changing relative position of the paper feeding belt and the separation roller, and changes and adjusts separation performance of the separation roller for the subsequent sheet,
• wherein the adjustment mechanism includes a cam follower member changing the relative position of the feeding belt and the separation roller in accordance with the rotation angle position of a rotating cam member,
• the cam member includes a first cam face and a second cam face which are formed at each rotation radius position in accordance with the rotation angle position, and are spaced apart in the rotation radius direction, and
• the cam follower member has a contact unit guided by the first cam face and the second cam face to a lift position in accordance with a rotation angle position of the cam member from both sides in the rotation radius direction.