Sheet feeding device and image forming apparatus

The invention relates to a sheet feeding device and an image forming apparatus. The sheet feeding device includes a container including a frame, an auxiliary frame member provided on the frame so as to be slidable relative to the frame, and a front cover that covers a front side of the auxiliary frame member, the container being detachably supported in a body of the sheet feeding device; a cover member that covers a top side of the container when the container is attached to the body; and a locking unit that prevents the container attached to the body from being detached from the body when the container is locked and that enables the container to be detached from the body when the container is not locked. 本发明涉及种片材供给装置和图像形成设备。该片材供给装置包括：容器，该容器包括框架、设置在所述框架上以能相对于所述框架滑动的辅助框架构件以及覆盖所述辅助框架构件的前侧的前盖，所述容器以可拆卸的方式被支撑在所述片材供给装置的本体中；盖构件，当所述容器被附接至所述本体时，所述盖构件覆盖所述容器的顶侧；以及锁定单元，当附接至所述本体的所述容器被锁定时，所述锁定单元防止所述容器从所述本体拆卸，并且当所述容器未被锁定时，所述锁定单元使得所述容器能从所述本体拆卸。