Toner supply apparatus with a drive member for driving an agitator and with a film covering the periphery of the drive member

1. A toner supply apparatus installed detachably in an image forming apparatus, comprising:

a container body which accommodates toner; and

an agitating member which is disposed inside the container body and is driven to rotate so as to agitate toner,

wherein the agitating member includes a drive member which is driven to rotate and a film member which is fixed on the drive member, and the film member covers the periphery of the drive member in a tubular fashion.

2. The toner supply apparatus according to claim 1 ,

wherein the drive member is a tubular member having a tubular peripheral wall having a center and being rotatable around the center of the tubular peripheral wall, the tubular peripheral wall being provided with openings through which toner is passed, and

the film member is fixed on an outer peripheral surface of the tubular peripheral wall.

3. The toner supply apparatus according to claim 2 ,

wherein the tubular member includes a pair of straight plate sections disposed in parallel with the tube center direction at an interval apart, and a plurality of semicircular arch pieces which is disposed between the pair of straight plate sections, gaps between adjacent arch pieces serving as the openings, and

the film member is a rectangular member, a first side edge thereof being fixed on one of the straight plate sections and the length from the first side edge until an opposing second side edge thereof being a length of at least approximately one revolution around the periphery of the tubular member.

4. The toner supply apparatus according to claim 1 ,

wherein the drive member is a tubular member including a plurality of ring pieces and a holding member which holds these ring pieces in a state of alignment along one axis, openings through which toner is passed being provided between the ring pieces, and

the film member is fixed on the holding member.

5. The toner supply apparatus according to claim 4 , wherein at least some of the plurality of ring pieces are formed in a spiral shape so as to convey toner.

6. The toner supply apparatus according to claim 2 , wherein the film member is provided with through holes in portions which oppose the openings of the tubular member in a state where the film member has covered the periphery of the tubular member in a tubular fashion.

7. The toner supply apparatus according to claim 6 , wherein the film member is provided with notch pieces which project inside the through holes and project outwards in a state where the film member has covered the periphery of the tubular member in a tubular fashion.

8. The toner supply apparatus according to claim 2 ,

wherein at least a portion of the tubular peripheral wall of the tubular member is constituted by a plurality of circular arc-shaped arch pieces, and openings provided between adjacent arch pieces, and

the film member has hole portions wider than the arch pieces in portions corresponding to the arch pieces in a state where the film member is laid along the periphery of the tubular member.

9. The toner supply apparatus according to claim 1 ,

wherein the drive member is a rod-shaped axis member which is rotatable around the axis thereof, and

the film member is fixed on the axis member in a state of having been formed into a tubular shape.

10. The toner supply apparatus according to claim 1 ,

wherein the drive member is driven to rotate about an axis member of the drive member, the film member is rectangular,

a first side edge the film member is fixed on the axis member, and

a second side edge which opposes the first side edge is fixed on the axis member in a state where the film member has covered a periphery of the axis member in a tubular fashion.

11. The toner supply apparatus according to claim 1 ,

wherein the container body has a first side wall and a second side wall opposing the first side wall,

the drive member is supported rotatably between the first side wall and the second side wall,

a toner filling hole for filling toner into the container body is provided in the first side wall, and

the film member which covers the periphery of the drive member in a tubular fashion is a member that is shorter than a length of the drive member in an axial direction of the drive member, and is fixed on an end of the drive member in proximity to the second side wall of the container body.

12. The toner supply apparatus according to claim 11 , wherein a film member that is shorter than the film member which covers the periphery of the drive member in a tubular fashion is fixed on an end of the drive member in proximity to the first side wall of the container body.

13. The toner supply apparatus according to claim 12 ,

wherein the drive member is a tubular member having a tubular peripheral wall, at least a portion of the tubular peripheral wall of the tubular member is constituted by a plurality of circular arc-shaped arch pieces, and openings provided between adjacent arch pieces, and

the film member has hole portions wider than the arch pieces in portions corresponding to the arch pieces in a state where the film member is laid along the periphery of the tubular member.

14. The toner supply apparatus according to claim 13 ,

wherein the film member includes at least two hole portions, and

when the film member has deformed into a state where the arch pieces are respectively fitted into the two hole portions, at least a portion of the openings present between the arch pieces are substantially covered by the portion of the film member, which is present between the two hole portions.