Powder transport device, developing device, and image forming apparatus

1. A powder transport device comprising:

a rotation shaft rotatably supported in a container chamber that contains powder; and

a plurality of blade members detachably attached to the rotation shaft, the blade members including spiral blades configured to transport the powder in an axial direction of the rotation shaft in response to the rotation shaft rotating, wherein

each of the plurality of blade members includes a cylindrical portion radially inward of the spiral blade, and each cylindrical portion is integrally formed with a corresponding one of the plurality of blades,

wherein the blade members have a shape such that a phase of a spiral blade of a blade member upstream of a joint between the spiral blades in a transport direction of the powder among adjacent blade members of the plurality of blade member, is shifted, and

wherein a detector configured to detect the powder is not disposed at a position where the detector faces the shape which shifts the phase of the spiral blade, in the container chamber.

2. The powder transport device according to claim 1 , wherein the spiral blades are attached to the blade members such that the spiral blades are continuous to each other in the axial direction of the rotation shaft.

3. A developing device comprising:

the powder transport device according to claim 2 ;

the container chamber that contains a toner;

a developing roller configured to receive the toner contained in the container chamber, and pass the toner to an image forming device, wherein

the powder transport device is provided in the container chamber, and

the powder transport device is configured to transport the toner as the powder.

4. An image forming apparatus comprising:

the developing device according to claim 3 ; and

the image forming device configured to form an image on a recording medium with the toner.

5. The powder transport device according to claim 1 , wherein

the plurality of blade members include adjacent blade members, one of adjacent blade members has a protrusion,

the other of the adjacent blade members has a recess, and

the protrusion and the recess are fitted to each other.

6. A developing device comprising:

the powder transport device according to claim 5 ;

the container chamber that contains a toner;

a developing roller configured to receive the toner contained in the container chamber, and pass the toner to an image forming device, wherein

the powder transport device is provided in the container chamber, and

the powder transport device is configured to transport the toner as the powder.

7. An image forming apparatus comprising:

the developing device according to claim 6 ; and

the image forming device configured to form an image on a recording medium with the toner.

8. The powder transport device according to claim 1 , wherein a phase of a spiral blade of a blade member downstream in a transport direction of the powder among adjacent blade members of the plurality of blade members, is shifted at a joint between the spiral blades to advance in the transport direction and is fixed.

9. The powder transport device according to claim 8 , wherein a detector configured to detect the powder is not disposed at a position where the detector faces the joint between the spiral blades in the container chamber.

10. A developing device comprising:

the powder transport device according to claim 8 ;

the container chamber that contains a toner;

a developing roller configured to receive the toner contained in the container chamber, and pass the toner to an image forming device, wherein

the powder transport device is provided in the container chamber, and

the powder transport device is configured to transport the toner as the powder.

11. A developing device comprising:

the powder transport device according to claim 1 ;

the container chamber that contains a toner;

a developing roller configured to receive the toner contained in the container chamber, and pass the toner to an image forming device, wherein

the powder transport device is provided in the container chamber, and

the powder transport device is configured to transport the toner as the powder.

12. An image forming apparatus comprising:

the developing device according to claim 11 ; and

the image forming device configured to form an image on a recording medium with the toner.

13. A powder transport device comprising: a rotation shaft rotatably supported in a container chamber that contains powder;

a plurality of blade members detachably attached to the rotation shaft, the blade members including spiral blades configured to transport the powder in an axial direction of the rotation shaft in response to the rotation shaft rotating; and

fixing members that fix the blade members to the rotation shaft, wherein

the plurality of blade members include adjacent blade members, one of adjacent blade members has a protrusion,

the other of the adjacent blade members has a recess,

the protrusion and the recess are fitted to each other, and

the protrusion and the recess are provided within a region of ±45 degrees in a rotation direction of the rotation shaft with respect to the fixing members.

14. A developing device comprising:

the powder transport device according to claim 13 ;

the container chamber that contains a toner;

a developing roller configured to receive the toner contained in the container chamber, and pass the toner to an image forming device, wherein

the powder transport device is provided in the container chamber, and

the powder transport device is configured to transport the toner as the powder.

15. An image forming apparatus comprising:

the developing device according to claim 14 ; and

the image forming device configured to form an image on a recording medium with the toner.