Image forming apparatus and toner case

1. An image forming apparatus comprising:

an attachment member; and

a toner case attachable and detachable to/from the attachment member along an attachment direction, wherein the toner case includes:

a case main body having a discharge port configured to discharge a toner; and

a shutter mechanism configured to open and close the discharge port, wherein the shutter mechanism has:

a supporting member arranged outside the case main body and having a communication port communicating with the discharge port;

a first shutter member positioned at a closing position configured to close the discharge port and the communication port in a condition in which the toner case is detached from the attachment member, and at an opening position configured to open the discharge port and the communication port in a condition in which the toner case is attached to the attachment member; and

a second shutter member positioned at a covering position configured to cover the back side edge portion of the communication port in the attachment direction from the outside in a condition in which the toner case is detached from the attachment member, and at an exposing position configured to expose the back side edge portion of the communication port in the attachment direction in a condition in which the toner case is attached to the attachment member.

2. The image forming apparatus according to claim 1 , wherein the second shutter member has a length in the attachment direction shorter than a length in the attachment direction of the first shutter member.

3. The image forming apparatus according to claim 1 , wherein the first shutter member is arranged outside the case main body and inside the supporting member and supported by the supporting member so as to be movable along the attachment direction, and the second shutter member is arranged outside the supporting member and supported by the supporting member so as to be movable along the attachment direction.

4. The image forming apparatus according to claim 3 , wherein a fitting portion is provided on the outer surface of the supporting member, and

a fitted portion, into which the fitting portion is fit in a condition in which the second shutter member is positioned at the covering position, is provided on the inner surface of the second shutter member.

5. The image forming apparatus according to claim 1 , wherein a first contacting projection is provided on the outer surface of the first shutter member,

a second contacting projection is provided on the outer surface of the second shutter member, at the back side of the first contacting projection in the attachment direction,

a contacting piece is provided on the inner surface of the attachment member, and

as the toner case is attached to the attachment member, the second contacting projection comes in contact with the contacting piece to change the position of the second shutter member from the covering position to the exposing position, and the first contacting projection comes in contact with the second contacting projection to change the position of the first shutter member from the closing position to the opening position.

6. The image forming apparatus according to claim 1 , wherein an engaged stop piece deformable on a side spaced away from the toner case is provided on the inner surface of the attachment member,

a mount portion capable of pressing the engaged stop piece is provided on the outer surface of the supporting member,

an engaged stop projection stopped in an engaged state with the engaged stop piece is provided on the outer surface of the second shutter member, and

as the toner case is detached from the attachment member, the engaged stop projection is stopped in an engaged state with the engaged stop piece to change the position of the second shutter member from the exposing position to the covering position, and the mount portion presses and thus deforms the engaged stop piece on the side spaced away from the toner case so as to release the engagement of the engaged stop projection with the engaged stop piece.

7. The image forming apparatus according to claim 1 , wherein the second shutter member has

a lower wall portion, and

side wall portions bent upward from the both sides of the lower wall portion.

8. The image forming apparatus according to claim 7 , wherein the supporting member has guiding holes along the attachment direction,

the side wall portions have guiding edge portions bent outward, and

the guiding edge portions come in contact with the upper face of the supporting member in a condition in which the side wall portions are inserted into the guiding holes.

9. A toner case provided at an image forming apparatus with an attachment member and attachable and detachable to/from the attachment member along an attachment direction comprising:

a case main body having a discharge port configured to discharge a toner; and

a shutter mechanism configured to open and close the discharge port, wherein the shutter mechanism has:

a supporting member arranged outside the case main body and having a communication port communicating with the discharge port;

a first shutter member positioned at a closing position configured to close the discharge port and the communication port in a condition in which the toner case is detached from the attachment member, and at an opening position configured to open the discharge port and the communication port in a condition in which the toner case is attached to the attachment member; and

a second shutter member positioned at a covering position configured to cover the back side edge portion of the communication port in the attachment direction from the outside in a condition in which the toner case is detached from the attachment member, and at an exposing position configured to expose the back side edge portion of the communication port in the attachment direction in a condition in which the toner case is attached to the attachment member.

10. The toner case according to claim 9 , wherein the second shutter member has a length in the attachment direction shorter than a length in the attachment direction of the first shutter member.

11. The toner case according to claim 9 , wherein the first shutter member is arranged outside the case main body and inside the supporting member and supported by the supporting member so as to be movable along the attachment direction, and

the second shutter member is arranged outside the supporting member and supported by the supporting member so as to be movable along the attachment direction.

12. The toner case according to claim 11 , wherein a fitting portion is provided on the outer surface of the supporting member, and

a fitted portion, into which the fitting portion is fit in a condition in which the second shutter member is positioned at the covering position, is provided on the inner surface of the second shutter member.

13. The toner case according to claim 9 , wherein a first contacting projection is provided on the outer surface of the first shutter member,

a second contacting projection is provided on the outer surface of the second shutter member, at the back side of the first contacting projection in the attachment direction,

a contacting piece is provided on the inner surface of the attachment member, and

as the toner case is attached to the attachment member, the second contacting projection comes in contact with the contacting piece to change the position of the second shutter member from the covering position to the exposing position, and the first contacting projection comes in contact with the second contacting projection to change the position of the first shutter member from the closing position to the opening position.

14. The toner case according to claim 9 , wherein an engaged stop piece deformable on a side spaced away from the toner case is provided on the inner surface of the attachment member,

a mount portion capable of pressing the engaged stop piece is provided on the outer surface of the supporting member,

an engaged stop projection stopped in an engaged state with the engaged stop piece is provided on the outer surface of the second shutter member, and

as the toner case is detached from the attachment member, the engaged stop projection is stopped in an engaged state with the engaged stop piece to change the position of the second shutter member from the exposing position to the covering position, and the mount portion presses and thus deforms the engaged stop piece on the side spaced away from the toner case so as to release the engagement of the engaged stop projection with the engaged stop piece.

15. The toner case according to claim 9 , wherein the second shutter member has

a lower wall portion, and

side wall portions bent upward from the both sides of the lower wall portion.

16. The toner case according to claim 15 , wherein the supporting member has guiding holes along the attachment direction,

the side wall portions have guiding edge portions bent outward, and

the guiding edge portions come in contact with the upper face of the supporting member in a condition in which the side wall portions are inserted into the guiding holes.