Imaging forming apparatus provided with photoreceptor unit with internal gear unit, the protector unit with internal gear, and internal gear unit

The photoreceptor unit with an internal gear, comprising:

• a photoreceptor drum;
• and
• an internal gear unit fitted in said photoreceptor drum, for actuating a rotary motion thereof,
• wherein said internal gear unit includes
• an internal gear member,
• a gear support member formed on a face perpendicular to an axial direction of said photoreceptor drum, for supporting said internal gear member, and
• a bearing member centrally situated in said gear support member, and
• a cover member, formed between said bearing member and said internal gear member, for covering a circumference of said bearing member,
• said internal gear member and said bearing member are formed so as to be projected in an axial direction of said photoreceptor drum to an outside with respect to said gear support member,
• said cover member is formed so as to be projected in the axial direction of said photoreceptor drum to an outside with respect to said gear support member, and
• an outer end portion in an axial direction of said photoreceptor drum extends in the axial direction of said photoreceptor drum to an outside with respect to said internal gear member.

A photoreceptor unit with an internal gear, comprising:

• a photoreceptor drum;
• an internal gear unit fitted in said photoreceptor drum, for actuating a rotary motion thereof;
• and
• a cover member formed on a member on a main body side for installing thereon said photoreceptor drum, said cover member being formed in an axial direction of said photoreceptor drum,
• wherein said internal gear unit includes
• an internal gear member,
• a gear support member formed on a face perpendicular in an axial direction of said photoreceptor drum, for supporting said internal gear member, and
• a bearing member centrally situated in said gear support member,
• said internal gear member and said bearing member are formed so as to be projected in an axial direction of said photoreceptor drum to said gear support member side, and
• said cover member is provided so as to cover a circumference of said bearing member.

A photoreceptor unit with an internal gear, comprising:

• a photoreceptor drum;
• and
• an internal gear unit, provided at one end portion of said photoreceptor drum,
• wherein said internal gear unit includes
• a cylindrical internal gear member,
• a disk member formed at one end portion in a widthwise direction of said internal gear member, and
• a reinforcement member formed in a vicinity of an outer circumference of a face opposite to said internal gear member of said disk member, for preventing a free end of said internal gear member from being deformed towards a center of said internal gear member, and
• said reinforcing member is formed in a cylindrical shape in such a manner that it is projected from said disk member to an opposite direction to a direction of said internal gear member, and that a projected leading end portion is formed thinner than an average thickness of said internal gear member.