Patent ID: 7684729

Claim:
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; a protection cover that opens and closes a portion of a peripheral surface of the photosensitive material drum; and an arm member rotatably arranged in the machine body and being drive-coupled to the protection cover to open and close the protection cover, wherein the protection cover is supported by the machine body so as to rotate between a closed position and an opened position, an end of the arm member is so positioned as to be present on a locus of motion of the developer which moves relative to said end of the arm member, and when the developer is moved in a direction to approach the photosensitive material drum along the guide means of the machine body, which moves relative to said end of the arm member, said 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.