Image-holding member cases, developing device cases, and image-forming apparatus

1. An image-forming apparatus comprising:

an image-holding member casing that encases an image-holding member for holding an image, such that the image-holding member is partially exposed;

an apparatus main body into which the image-holding member casing is inserted to a predetermined position;

a developing device casing provided in the apparatus main body, the developing device casing encasing a developing device, such that the developing device is partially exposed, the developing device supplying developer to the image-holding member encased in the image-holding member casing inserted to the predetermined position;

a pushing member provided in the apparatus main body to push the developing device casing in a first direction toward the image-holding member; and

a contact portion provided on the image-holding member casing so as to contact the developing device casing for a predetermined period during insertion of the image-holding member casing toward the predetermined position in the apparatus main body, to push the developing device casing in a second direction opposite to the first direction, wherein, after the predetermined period, when the image-holding member casing reaches the predetermined position, the contact portion does not push the developing device casing in the second direction,

wherein

the developing device is rotatable about a shaft,

the developing device casing is provided with a distance-maintaining member for maintaining a distance between the developing device and the image-holding member, the distance-maintaining member being rotatable about the shaft while being in contact with the image-holding member, and

the contact portion contacts the distance-maintaining member to push the developing device casing when the image-holding member casing is inserted into the apparatus main body.

2. The image-forming apparatus according to claim 1 ,

wherein

the contact portion contacts the developing device casing for a predetermined period during removal of the image-holding member casing from the predetermined position in the apparatus main body, to push the developing device casing in the second direction, and stops pushing the developing device casing by the time removal of the image-holding member casing from the apparatus main body is completed, and

a surface of the contact portion that contacts the developing device casing first when the image-holding member casing is removed from the predetermined position in the apparatus main body has a normal vector having a first directional component in a direction of removal of the image-holding member casing and a second directional component in a direction from the image-holding member casing at the predetermined position toward the developing device casing.

3. The image-forming apparatus according to claim 1 ,

wherein

the image-holding member casing includes:

a cleaning member that cleans a surface of the image-holding member; and

a support member that supports a cleaning member and is made of a material prone to be attracted to a magnet,

the developing device has magnetic attraction ability, and

the support member is positioned to face an exposed portion of the developing device to be magnetically attracted to the developing device, when the image-holding member casing is inserted toward the predetermined position in the apparatus main body or when the image-holding member casing is removed from the predetermined position.

4. The image-forming apparatus according to claim 1 , wherein a part of the contact portion that contacts the developing device casing first when the image-holding member casing is inserted toward the predetermined position in the apparatus main body is located closer to a part of the contact portion on a side of the developing device casing than to a part of the contact portion on a side of the image-forming member casing.

5. The image-forming apparatus according to claim 1 , wherein

a surface of the contact portion that contacts the developing device casing last when the image-holding member casing is inserted toward the predetermined position in the apparatus main body is an inclined surface that has a normal vector having a third directional component in a direction opposite to a direction of insertion of the image-holding member casing toward the predetermined position in the apparatus main body and a fourth directional component in a direction from the image-holding member casing toward the developing device casing in a state where the image-holding member casing has been inserted to the predetermined position.

6. An image-forming apparatus comprising:

an image-holding member casing that encases an image-holding member for holding an image, such that the image-holding member is partially exposed;

an apparatus main body into which the image-holding member casing is inserted to a predetermined position;

a developing device casing provided in the apparatus main body, the developing device casing encasing a developing device, such that the developing device is partially exposed, the developing device supplying developer to the image-holding member encased in the image-holding member casing inserted to the predetermined position;

a pushing member provided in the apparatus main body to push the developing device casing in a first direction toward the image-holding member; and

a contact portion provided on the image-holding member casing so as to contact the developing device casing for a predetermined period during insertion of the image-holding member casing toward the predetermined position in the apparatus main body, the contact portion protruding in a direction from the image-holding member casing toward the developing device casing,

wherein

the developing device is rotatable about a shaft,

the developing device casing is provided with a distance-maintaining member for maintaining a distance between the developing device and the image-holding member, the distance-maintaining member being rotatable about the shaft while being in contact with the image-holding member, and

the contact portion contacts the distance-maintaining member to push the developing device casing when the image-holding member casing is inserted into the apparatus main body.

7. An image-forming apparatus comprising:

an image-holding member casing that encases an image-holding member for holding an image, such that the image-holding member is partially exposed;

an apparatus main body into which the image-holding member casing is inserted to a predetermined position;

a developing device casing provided in the apparatus main body, the developing device casing encasing a developing device, such that the developing device is partially exposed, the developing device supplying developer to the image-holding member encased in the image-holding member casing inserted to the predetermined position;

a pushing member provided in the apparatus main body to push the developing device casing in a first direction toward the image-holding member; and

a contact portion provided on the image-holding member casing so as to contact the developing device casing for a predetermined period during insertion of the image-holding member casing toward the predetermined position in the apparatus main body, to push the developing device casing in a second direction opposite to the first direction, wherein, after the predetermined period, when the image-holding member casing reaches the predetermined position, the contact portion does not push the developing device casing in the second direction,

wherein

the image-holding member casing includes:

a cleaning member that cleans a surface of the image-holding member; and

a support member that supports a cleaning member and is made of a material prone to be attracted to a magnet,

the developing device has magnetic attraction ability, and

the support member is positioned to face an exposed portion of the developing device to be magnetically attracted to the developing device, when the image-holding member casing is inserted toward the predetermined position in the apparatus main body or when the image-holding member casing is removed from the predetermined position.

8. The image-forming apparatus according to claim 7 ,

wherein

the contact portion contacts the developing device casing for a predetermined period during removal of the image-holding member casing from the predetermined position in the apparatus main body, to push the developing device casing in the second direction, and stops pushing the developing device casing by the time removal of the image-holding member casing from the apparatus main body is completed, and

a surface of the contact portion that contacts the developing device casing first when the image-holding member casing is removed from the predetermined position in the apparatus main body has a normal vector having a first directional component in a direction of removal of the image-holding member casing and a second directional component in a direction from the image-holding member casing at the predetermined position toward the developing device casing.

9. The image-forming apparatus according to claim 7 , wherein a part of the contact portion that contacts the developing device casing first when the image-holding member casing is inserted toward the predetermined position in the apparatus main body is located closer to a part of the contact portion on a side of the developing device casing than to a part of the contact portion on a side of the image-forming member casing.

10. The image-forming apparatus according to claim 7 , wherein

a surface of the contact portion that contacts the developing device casing last when the image-holding member casing is inserted toward the predetermined position in the apparatus main body is an inclined surface that has a normal vector having a third directional component in a direction opposite to a direction of insertion of the image-holding member casing toward the predetermined position in the apparatus main body and a fourth directional component in a direction from the image-holding member casing toward the developing device casing in a state where the image-holding member casing has been inserted to the predetermined position.