Image-forming machine

An image-forming machine comprising a photosensitive material drum rotatably arranged in a machine body, a developer mounted on the machine body so as to move in a direction to approach, and separate away from, the photosensitive material drum along guide means arranged in the machine body, and a protection cover that opens and closes a portion of the peripheral surface of the photosensitive material drum;

• wherein
• the protection cover is supported by the machine body so as to rotate between a closed position and an opened position, an arm member is rotatably arranged in the machine body being drive-coupled to the protection cover so as to open and close the protection cover, and an end of the arm member is so positioned as to be present on a locus of motion of the developer;
• and
• when the developer is moved in a direction to approach the photosensitive material drum along the guide means of the machine body, the one end of the arm member is rotated by the developer in one rotational direction, and the protection cover rotates in a direction in which it opens from the closed position up to the opened position.