Package including folding sheet members

1. A package comprising:

a main body configured to form a storage space to accommodate a packaged object, the main body including folded sheet members, and each of the folded sheet members includes an impact buffer rib, the impact buffer rib disposed on a side of another folded sheet member and outside the storage space, the impact buffer rib including:

root portions that are both end portions of the impact buffer rib coupling to the main body and having a first height; and

a central portion between the root portions, the central portion having a second height larger than the first height.

2. The package according to claim 1 ,

wherein a distal edge of each of the root portions with respect to the storage space is closer to the side of the main body than a distal edge of the central portion with respect to the storage space.

3. The package according to claim 1 ,

wherein each of the root portions has a gap between a proximal edge of each of the root portions with respect to the storage space and the side of the main body.

4. The package according to claim 1 ,

wherein a distal edge of each of the root portions with respect to the storage space is closer to the side of the main body than a distal edge of the central portion with respect to the storage space, and

wherein each of the root portions has a gap between a proximal edge of each of the root portions with respect to the storage space and the side of the main body.

5. The package according to claim 1 ,

wherein the central portion of the impact buffer rib includes at least one bent portion, and

wherein the central portion is a single continuous part within a contact surface area between the packaged object and a packaged object receiving surface of the package.

6. The package according to claim 5 ,

wherein the central portion of the impact buffer rib includes an effective length portion having an effective length corresponding to a required impact buffer function, and

wherein the at least one bent portion is disposed within the effective length portion.

7. The package according to claim 6 ,

wherein the central portion of the impact buffer rib has a V-shaped form with one bent portion, a C-shaped form with two bent portions, or an M-shaped form with three bent portions.

8. The package according to claim 6 ,

wherein the central portion of the impact buffer rib includes a vicinity structure portion having a third height smaller than a fourth height of the effective length portion.

9. The package according to claim 1 , further comprising

four impact buffer ribs including the impact buffer rib,

wherein the four impact buffer ribs are disposed on four sides that are an upper side, a lower side, a left side, and a right side of the package, respectively.

10. The package according to claim 1 , further comprising

an overturn preventing portion disposed on the impact buffer rib and configured to prevent the package from overturning.

11. The package according to claim 10 ,

wherein the overturn preventing portion is disposed on an end portion of each of the root portions and has a height equal to the second height of the central portion.

12. The package according to claim 1 , further comprising

an impact buffer rib member fitted into a frame space of the package on a side of the storage space.

13. The package according to claim 12 ,

wherein the impact buffer rib member is made of a corrugated cardboard sheet.

14. The package according to claim 12 ,

wherein the impact buffer rib member is a foamed resin molded product or a pulp molded product and has a projection.

15. The package according to claim 1 ,

wherein the central portion of the impact buffer rib has a tapered portion inclined from a distal end of the impact buffer rib with respect to the storage space toward the side of the main body and disposed at a boundary portion between a first part of the central portion and a second part of the central portion having a lower height from the side of the main body than the first part.

16. The package according to claim 1 ,

wherein the storage space is covered with two folded sheet members.

17. The package according to claim 16 ,

wherein the sheet member is a corrugated cardboard sheet.

18. The package according to claim 17 ,

wherein the corrugated cardboard sheet is a double-faced corrugated cardboard sheet or a double wall corrugated cardboard sheet.

19. The package according to claim 17 ,

wherein an opening direction of a hollow portion of the corrugated cardboard sheet is parallel to or orthogonal to a height direction of the impact buffer rib.

20. The package according to claim 1 ,

wherein the package is configured to package at least one of an image forming apparatus or an image forming unit for the image forming apparatus.