Sheet accommodating apparatus, image forming system, and extension unit

1. A sheet accommodating apparatus comprising:

a main body portion;

a loading portion that is provided in the main body portion and supports a portion of a sheet loaded thereon from below;

a lifting unit that lifts the loading portion; and

a supporting portion that is connected to the main body portion and supports another portion of the sheet from below during a process in which the loading portion is lifted,

wherein the supporting portion includes an inclined portion that is inclined to form an upward slope from the loading portion side and a horizontal portion that extends horizontally from an upper side of the inclined portion,

wherein a lower end portion of the inclined portion is supported such that the lower end portion becomes rotatable with respect to a bottom surface on the loading portion side, and

wherein an upper end portion of the inclined portion is slidable against an inclined surface as the loading portion is lifted, the inclined surface extending from the horizontal portion to fonn a downward slope.

2. The sheet accommodating apparatus according to claim 1 ,

wherein the supporting portion is provided to protrude outward from the main body portion.

3. The sheet accommodating apparatus according to claim 2 ,

wherein the supporting portion is provided on one end side in a length direction of the sheet with respect to the loading portion.

4. The sheet accommodating apparatus according to claim 3 ,

wherein a transportation unit that transports the sheet loaded onto the loading portion is provided, and

wherein the supporting portion supports a portion of the sheet that is on an upstream side in a transportation direction of the sheet.

5. The sheet accommodating apparatus according to claim 4 ,

wherein the transportation unit is configured to blow air to the sheet loaded onto the loading portion and suck an uppermost sheet to transport the uppermost sheet.

6. The sheet accommodating apparatus according to claim 1 ,

wherein the supporting portion is provided on one end side in a length direction of the sheet with respect to the loading portion.

7. The sheet accommodating apparatus according to claim 6 ,

wherein a transportation unit that transports the sheet loaded onto the loading portion is provided, and

wherein the supporting portion supports a portion of the sheet that is on an upstream side in a transportation direction of the sheet.

8. The sheet accommodating apparatus according to claim 7 ,

wherein the transportation unit is configured to blow air to the sheet loaded onto the loading portion and suck an uppermost sheet to transport the uppermost sheet.

9. The sheet accommodating apparatus according to claim 8 ,

wherein a height of a loading surface of the supporting portion onto which the sheet is loaded is greater than a height of a loading surface of the loading portion in a case where the loading portion is at a lowermost lowering position.

10. The sheet accommodating apparatus according to claim 7 ,

wherein the lifting unit includes an upstream side wire that is disposed on the upstream side in the transportation direction of the sheet and lifts the loading portion and a downstream side wire that is disposed on a downstream side in the transportation direction of the sheet and lifts the loading portion, and wherein the supporting portion is configured to support the sheet at a position upstream of the upstream side wire in the transportation direction of the sheet.

11. The sheet accommodating apparatus according to claim 10 ,

wherein the supporting portion is directly or indirectly fixed to the main body portion.

12. The sheet accommodating apparatus according to claim 7 ,

wherein a distance from a downstream side end portion of the loading portion to an upstream side end portion of the supporting portion in the transportation direction of the sheet is greater than a length of an A 3 sheet in a longitudinal direction.

13. The sheet accommodating apparatus according to claim 12 ,

wherein the distance from the downstream side end portion of the loading portion in the transportation direction of the sheet to the upstream side end portion of the supporting portion is set to such a distance that a teiiiiinal of the sheet having a length of 1200 mm does not stick out.

14. The sheet accommodating apparatus according to claim 7 , wherein the uppermost sheet is sucked by a suction unit.

15. The sheet accommodating apparatus according to claim 1 ,

wherein an extension loading portion that is attached to the loading portion to extend a length of the loading portion is provided between the loading portion and the supporting portion.

16. An image foiining system comprising:

the sheet accommodating apparatus according to claim 1 that includes a transportation unit; and

an image forming apparatus that forms an image on the sheet transported from the sheet accommodating apparatus.

17. An extension unit comprising:

a supporting portion that is attached to a main body portion of a sheet accommodating apparatus and supports a portion of a sheet loaded onto a loading portion from below during a process in which the loading portion provided in the main body portion is lifted with respect to the main body portion,

wherein the supporting portion includes an inclined portion that is inclined to form an upward slope from the loading portion side and a horizontal portion that extends horizontally from an upper side of the inclined portion,

wherein a lower end portion of the inclined portion is supported such that the lower end portion becomes rotatable with respect to a bottom surface on the loading portion side, and

wherein an upper end portion of the inclined portion is slidable against an inclined surface as the loading portion is lifted, the inclined surface extending from the horizontal portion to form a downward slope.

18. The extension unit according to claim 17 , further comprising:

an extension loading portion that is attached to the loading portion to extend a length of the loading portion.