Developing roller and developing box

Abstract

According to the developing roller and the developing box provided with the developing roller, the developing roller comprises a developing roller shaft and a developing roller layer located on the radial outer side of the developing roller shaft, and the maximum size of the developing roller layer in the axial direction of the developing roller is smaller than the maximum size of the developing roller shaft in the axial direction of the developing roller. The developing roller shaft comprises a main body, a first end part and a second end part, the first end part and the second end part are oppositely arranged at an interval in the axial direction of the developing roller, and the first end part and the second end part are respectively positioned on two sides of the main body; the main body is provided with a retainer for limiting / inhibiting the movement of the developing roller along the axial direction of the developing roller; therefore, the possibility that the developing agent leaks when the developing roller moves along the axial direction of the developing roller is reduced, and the service life of the developing box is prolonged at the same time.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electrophotographic imaging, and particularly relates to a developing box which can be detachably installed in an imaging device and a developing roller in the developing box. BACKGROUND

[0002] The developing box is a consumable which can be detachably installed in the imaging device, and comprises a developing shell and a developing roller rotatably arranged in the developing shell. A powder bin for accommodating a developer is formed in the developing shell, and the developing roller is used to supply the developer to the outside of the developing box. The developing box further comprises a driving force receiving member for receiving a driving force from the imaging device and a developing gear for receiving the driving force from the driving force receiving member, and the developing gear is used to drive the developing roller to rotate.

[0003] In the existing developing box, in order to make the rotation of the developing roller more stable and the developer be more stably supplied to the outside of the developing box, the developing gear is arranged as a helical gear. In this arrangement, during the rotation of the developing roller, the helical gear generates a force parallel to the axial direction of the developing roller. Under the action of the force, the developing roller moves along the axial direction, thereby causing the developer to leak. SUMMARY

[0004] The developing roller and the developing box provided with the same can solve at least one of the above technical problems, and the specific technical solutions are as follows.

[0005] The developing roller comprises a developing roller shaft and a developing roller layer located on the radial outer side of the developing roller shaft. The maximum dimension of the developing roller layer in the axial direction of the developing roller is less than the maximum dimension of the developing roller shaft in the axial direction of the developing roller. The developing roller shaft comprises a main body, a first end portion and a second end portion. In the axial direction of the developing roller, the first end portion and the second end portion are oppositely arranged at intervals, and the first end portion and the second end portion are respectively located on both sides of the main body. The main body is provided with a stopper for limiting / restraining the developing roller from moving along the axial direction thereof.

[0006] The maximum dimension of the developing roller layer in the axial direction of the developing roller is not more than the maximum dimension of the stopper in the axial direction of the developing roller.

[0007] In the axial direction of the developing roller, the two ends of the developing roller layer do not protrude beyond the two ends of the stopper.

[0008] The stopper includes a first stopper portion, a second stopper portion, and a connecting portion for connecting the first stopper portion and the second stopper portion, a side surface of an axial end of the first stopper portion is formed as a first stopper surface, and a side surface of an axial end of the second stopper portion is formed as a second stopper surface; the maximum radial dimension of the first stopper portion / first stopper surface and the maximum radial dimension of the second stopper portion / second stopper surface are not greater than the maximum radial dimension of the developing roller layer.

[0009] The maximum radial dimension of the first stopper portion / first stopper surface is greater than the maximum radial dimension of the first end portion of the developing roller shaft, and the maximum radial dimension of the second stopper portion / second stopper surface is greater than the maximum radial dimension of the second end portion of the developing roller shaft.

[0010] In the axial direction of the developing roller, a first interval is formed between the first side surface of the developing roller layer close to the axial end of the first stopper portion and the first stopper surface, and a second interval is formed between the second side surface of the developing roller layer close to the axial end of the second stopper portion and the second stopper surface.

[0011] The maximum radial dimension of the first stopper portion / first stopper surface is not less than the maximum radial dimension of the connecting portion, and the maximum radial dimension of the second stopper portion / second stopper surface is not less than the maximum radial dimension of the connecting portion.

[0012] The first stopper portion is further formed with a third stopper surface opposite to the first stopper surface, compared with the first stopper surface, the third stopper surface is closer to the connecting portion along the axial direction of the developing roller, and the orientation of the first stopper surface and the orientation of the third stopper surface are opposite; the second stopper portion is further formed with a fourth stopper surface opposite to the second stopper surface, the orientation of the second stopper surface and the orientation of the fourth stopper surface are opposite, and compared with the second stopper surface, the fourth stopper surface is closer to the connecting portion along the axial direction of the developing roller.

[0013] When neither the first stopper portion nor the second stopper portion is covered / wrapped by the developing roller layer, in the axial direction of the developing roller, the developing roller layer is located between the first stopper portion and the second stopper portion, the third stopper surface abuts against the first side surface of the developing roller layer, and the fourth stopper surface abuts against the second side surface of the developing roller layer.

[0014] The developing cartridge includes a developing housing and the above-mentioned developing roller, the developing roller is rotatably arranged in the developing housing, and the developing roller is used to supply the developer in the developing housing to the outside of the developing cartridge; the developing cartridge includes a driving force receiving member for receiving the driving force from the image forming device, and one end of the developing cartridge provided with the driving force receiving member is a driving end, and the other end opposite to the driving end is a non-driving end;

[0015] The developing box further comprises a first support and a second support respectively located at two sides of the developing housing, the first support has a first matching surface facing the developing roller layer / non-driving end, the second support has a second matching surface facing the developing roller layer / driving end, and the first matching surface and the second matching surface are both used for abutting against the stopper to limit movement of the developing roller in the axial direction thereof.

[0016] Compared with the prior art, the developing roller and the developing box provided with the same have the first stop surface capable of abutting against the first support / first matching surface and the second stop surface capable of abutting against the second support / second matching surface, the movement of the developing roller in the axial direction thereof is limited / inhibited, the possibility of leakage of the developing agent during the movement is reduced, and the service life of the developing box is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a perspective view of the developing box related to the embodiment one of the utility model.

[0018] Figure 2 is an exploded view of partial assembly of the developing box related to the embodiment one of the utility model.

[0019] Figure 3 is a plan view of the developing box related to the embodiment one of the utility model, viewed along the direction perpendicular to the axial direction of the developing roller.

[0020] Figure 4 is a perspective view of the developing roller of the developing box related to the embodiment one of the utility model.

[0021] Figure 5 is an exploded view of Figure 4 .

[0022] Figure 6 is a perspective view of the developing roller shaft of the developing box related to the embodiment two of the utility model. DETAILED DESCRIPTION

[0023] The embodiments related to the utility model are described in detail below with reference to the drawings.

[0024] [Embodiment one]

[0025] Figure 1 is a perspective view of the developing box related to the embodiment one of the utility model; Figure 2 is an exploded view of partial assembly of the developing box related to the embodiment one of the utility model; Figure 3 is a plan view of the developing box related to the embodiment one of the utility model, viewed along the direction perpendicular to the axial direction of the developing roller. Figure 4 is a perspective view of the developing roller of the developing box related to the embodiment one of the utility model; Figure 5 is an exploded view of Figure 4an exploded view of the developing cartridge 100.

[0026] The developing cartridge 100 can be detachably mounted to an image forming apparatus, as shown in Figure 1 , Figure 2 and Figure 3 , the developing cartridge 100 includes a developing housing 1 in which a powder reservoir for accommodating a developer is formed, and a developing roller 2 rotatably provided in the developing housing 1 for supplying the developer outside the developing cartridge 100, as shown in Figure 4 and Figure 5 , the developing roller 2 includes a developing roller shaft 21 and a developing roller layer 22 located radially outward of the developing roller shaft 21.

[0027] Continuing as shown in Figure 1 , Figure 2 and Figure 3 , the developing cartridge 100 further includes a driving force receiving member 3 for receiving a driving force from the image forming apparatus and a developing gear 4 for receiving the driving force from the driving force receiving member 3 to drive the developing roller 2 to rotate about the developing roller shaft 21; continuing as shown in Figure 4 and Figure 5 , the developing roller shaft 21 includes a main body 213, a first end portion 211 and a second end portion 212, the first end portion 211 and the second end portion 212 are oppositely arranged in an axial direction of the developing roller 2, and the first end portion 211 and the second end portion 212 are respectively located at two sides of the main body 213, one of the first end portion 211 and the second end portion 212 is used to support the developing gear 4.

[0028] In some embodiments, the developing gear 4 and the driving force receiving member 3 are located at the same side of the developing cartridge 100 / developing housing 1 in the axial direction of the developing roller 2.

[0029] The developing cartridge 100 is provided with one end of the driving force receiving member 3 as a driving end and an opposite end of the driving end as a non-driving end, the driving end and the non-driving end are oppositely arranged in the axial direction of the developing roller 2.

[0030] In the axial direction of the developing roller 2, the developing roller layer 22 is located between the first end portion 211 and the second end portion 212, and the maximum dimension of the developing roller layer 22 in the axial direction of the developing roller 2 is less than the maximum dimension of the developing roller shaft 21 in the axial direction of the developing roller 2, in other words, the first end portion 211 and the second end portion 212 of the developing roller shaft 21 respectively protrude from two ends of the developing roller layer 22 in the axial direction of the developing roller 2.

[0031] In some embodiments, the developing gear 4 is provided as a helical gear, so that the developing roller 2 can rotate more smoothly.

[0032] As shown in Figure 1 ,Figure 2 and Figure 3 As shown in FIG. 1, the developing cartridge 100 further comprises a first bracket 5 and a second bracket 6 respectively located at two sides of the developing housing 1 along the axial direction of the developing roller 2, and the first bracket 5 and the second bracket 6 are respectively detachably connected with the developing housing 1.

[0033] In some embodiments, the developing roller 2 / developing roller shaft 21 is supported by the first bracket 5 and the second bracket 6, specifically, the first bracket 5 is used to support the first end portion 211, and the second bracket 6 is used to support the second end portion 212.

[0034] The first bracket 5 has a first mating surface 51 facing the developing roller layer 22 / non-driving end, and the second bracket 6 has a second mating surface 61 facing the developing roller layer 22 / driving end.

[0035] As shown in FIG. 1, the main body 213 of the developing roller 2 is provided with a stopper 7 for limiting / restraining the movement of the developing roller 2 along the axial direction thereof, and the maximum dimension of the developing roller layer 22 in the axial direction of the developing roller 2 does not exceed the maximum dimension of the stopper 7 in the axial direction of the developing roller 2, in other words, along the axial direction of the developing roller 2, the two ends of the developing roller layer 22 do not protrude beyond the two ends of the stopper 7. Figure 1 、 Figure 3 、 Figure 4 and Figure 5 As shown in FIG. 1, the main body 213 of the developing roller 2 is provided with a stopper 7 for limiting / restraining the movement of the developing roller 2 along the axial direction thereof, and the maximum dimension of the developing roller layer 22 in the axial direction of the developing roller 2 does not exceed the maximum dimension of the stopper 7 in the axial direction of the developing roller 2, in other words, along the axial direction of the developing roller 2, the two ends of the developing roller layer 22 do not protrude beyond the two ends of the stopper 7.

[0036] The stopper 7 comprises a first stop portion 71, a second stop portion 72, and a connecting portion 73 connecting the first stop portion 71 and the second stop portion 72, and the connecting portion 73 is located between the first stop portion 71 and the second stop portion 72 in the axial direction of the developing roller 2, the first stop portion 71 is closer to the driving end than the connecting portion 73 in the axial direction of the developing roller 2, and the second stop portion 72 is closer to the non-driving end than the connecting portion 73 in the axial direction of the developing roller 2, the first stop portion 71 is used to abut against the first bracket 5 / first mating surface 51 to limit the movement of the developing roller 2 in the direction of the driving end, and the second stop portion 72 is used to abut against the second bracket 6 / second mating surface 61 to limit the movement of the developing roller 2 in the direction of the non-driving end.

[0037] The side surface of the axial end of the first stop portion 71 forms a first stop surface 711 for mutual abutment with the first mating surface 51, and the first stop surface 711 is formed as a side surface facing the driving end and closest to the driving end; the side surface of the axial end of the second stop portion 72 forms a second stop surface 721 for mutual abutment with the second mating surface 61, and the second stop surface 721 is formed as a side surface facing the non-driving end and closest to the non-driving end.

[0038] In some embodiments, in the axial direction of the developing roller 2, the first stop portion 71 is closer to the driving end than the developing roller layer 22, the second stop portion 72 is closer to the non-driving end than the developing roller layer 22, at least a part of the main body 213 is not wrapped / covered by the developing roller layer 22, specifically, in the axial direction of the developing roller 2, a first interval d1 is formed between the first side surface 221 of the developing roller layer 22 close to the axial end of the first stop portion 71 / driving end and the first stop surface 711, a second interval is formed between the second side surface 222 of the developing roller layer 22 close to the axial end of the second stop portion 72 / non-driving end and the second stop surface 721, in this way, at least a part of the first stop portion 71 and at least a part of the second stop portion 72 are exposed, which can play a role in protecting the developing roller layer 22.

[0039] The maximum radial dimension of the first stop portion 71 / first stop surface 711 and the maximum radial dimension of the second stop portion 72 / second stop surface 721 are not greater than the maximum radial dimension of the developing roller layer 22, and the first stop surface 711 and the second stop surface 721 are exposed; the maximum radial dimension of the first stop portion 71 / first stop surface 711 is greater than the maximum radial dimension of the first end portion 211 of the developing roller shaft 21, and the maximum radial dimension of the second stop portion 72 / second stop surface 721 is greater than the maximum radial dimension of the second end portion 212 of the developing roller shaft 21.

[0040] The maximum radial dimension of the first stop portion 71 / first stop surface 711 is not less than the maximum radial dimension of the connecting portion 73 of the main body 213, and the maximum radial dimension of the second stop portion 72 / second stop surface 721 is not less than the maximum radial dimension of the connecting portion 73 of the main body 213, in this embodiment, the maximum radial dimension of the first stop portion 71 / first stop surface 711 and the maximum radial dimension of the second stop portion 72 / second stop surface 721 are equal to the maximum radial dimension of the connecting portion 73 of the main body 213.

[0041] In some embodiments, the first end portion 211, the second end portion 212 and the stop piece 7 of the developing roller shaft 21 can be integrally machined.

[0042] [Embodiment Two]

[0043] This embodiment is only for the differences from Embodiment One.

[0044] Figure 6 is a perspective view of the developing roller shaft of the developing cartridge according to Embodiment Two of the present application.

[0045] In this embodiment, as Figure 6As shown, the maximum radial dimension of the first stop portion 71 / first stop surface 711 is greater than the maximum radial dimension of the connecting portion 73 of the main body 213, and the maximum radial dimension of the second stop portion 72 / second stop surface 721 is greater than the maximum radial dimension of the connecting portion 73 of the main body 213.

[0046] In some embodiments, the first stop portion 71 and the second stop portion 72 are both arranged in a circular ring shape.

[0047] The first stop portion 71 is further formed with a third stop surface 712 opposite to the first stop surface 711, the orientation of the first stop surface 711 is opposite to the orientation of the third stop surface 712, the second stop portion 72 is further formed with a fourth stop surface 722 opposite to the second stop surface 721, the orientation of the second stop surface 721 is opposite to the orientation of the fourth stop surface 722, along the axial direction of the developing roller 2, compared with the first stop surface 711, the third stop surface 712 is closer to the connecting portion 73 and farther from the driving end, along the axial direction of the developing roller, compared with the second stop surface 721, the fourth stop surface 722 is closer to the connecting portion and farther from the non-driving end.

[0048] The maximum radial dimension of the third stop surface 712 is not greater than the maximum radial dimension of the developing roller layer 22, and the maximum radial dimension of the fourth stop surface 722 is not greater than the maximum radial dimension of the developing roller layer 22; the maximum radial dimension of the third stop surface 712 is greater than the maximum radial dimension of the first end portion 211 of the developing roller shaft 21, and the maximum radial dimension of the fourth stop surface 722 is greater than the maximum radial dimension of the second end portion 212 of the developing roller shaft 21.

[0049] In some embodiments, at least a portion of the stopper 7 is covered / wrapped by the developing roller layer 22, specifically, at least a portion of the first stop portion 71 is covered / wrapped by the developing roller layer 22, the third stop surface 712 is covered / wrapped by the developing roller layer 22, and the first stop surface 711 is exposed; at least a portion of the second stop portion 72 is covered / wrapped by the developing roller layer 22, the fourth stop surface 722 is covered / wrapped by the developing roller layer 22, and the second stop surface 721 is exposed.

[0050] In some embodiments, neither the first stop portion 71 nor the second stop portion 72 is covered / wrapped by the developing roller layer 22, and in the axial direction of the developing roller 2, the developing roller layer 22 is located between the first stop portion 71 and the second stop portion 72, at this time, the third stop surface 712 can abut against the first side surface 221 of the developing roller layer 22 to limit the movement of the developing roller 2 / developing roller layer 22 toward the non-driving end, and the fourth stop surface 722 can abut against the second side surface 222 of the developing roller layer 22 close to the non-driving end to limit the movement of the developing roller 2 / developing roller layer 22 toward the driving end.

[0051] In the utility model, when the developing gear 4 is set as a helical gear, the developing gear 4 will generate a component force along the axial direction of the developing roller 2 in the rotating process, and the component force will make the developing roller 2 have a tendency to move between the first support 5 and the second support 6; since the developing box 100 is provided with the first stop surface 711 capable of abutting against the first support 5 / the first cooperation surface 51 and the second stop surface 721 capable of abutting against the second support 6 / the second cooperation surface 61, the movement of the developing roller 2 in the axial direction thereof is inhibited, so that the developing roller 2 is stably supported in the developing box 100.

[0052] [Advantages]

[0053] Compared with the prior art, the developing roller 2 and the developing box 100 provided by the utility model have the following advantages:

[0054] In the first aspect, the developing roller 2 is provided with the first stop surface 711 capable of abutting against the first support 5 / the first cooperation surface 51 and the second stop surface 721 capable of abutting against the second support 6 / the second cooperation surface 61, which can limit / inhibit the movement of the developing roller 2 in the axial direction thereof, reduce the possibility of leakage of the developing agent in the movement process, and prolong the service life of the developing box 100.

[0055] In the second aspect, in the second embodiment, when the stop piece 7 is not covered / wrapped by the developing roller layer 22, the third stop surface 712 of the stop piece 7 is capable of abutting against the first side surface 221 of the developing roller layer 22, and the fourth stop surface 722 is capable of abutting against the second side surface 222 of the developing roller layer 22, so as to further limit the movement of the developing roller 2 in the axial direction thereof, and the developing agent is less likely to leak.

[0056] In the third aspect, compared with the first embodiment, the maximum radial dimension of the first stop portion 71 / the first stop surface 711 in the second embodiment is greater than the maximum radial dimension of the connecting portion 73 of the main body 213, and the maximum radial dimension of the second stop portion 72 / the second stop surface 721 is greater than the maximum radial dimension of the connecting portion 73 of the main body 213, so that the production cost of the developing box 100 / the developing roller 2 can be reduced.

Claims

1. A developing roller comprising a developing roller shaft and a developing roller layer located radially outward of the developing roller shaft, the developing roller layer having a maximum dimension in an axial direction of the developing roller that is less than a maximum dimension of the developing roller shaft in the axial direction of the developing roller, the developing roller shaft comprising a main body, a first end portion, and a second end portion, the first end portion and the second end portion being spaced apart from each other in the axial direction of the developing roller, the first end portion and the second end portion being located on opposite sides of the main body; characterized in that the main body is provided with a stopper for limiting / restraining movement of the developing roller in the axial direction thereof.

2. The developer roller of claim 1, wherein the maximum dimension of the developing roller layer in the axial direction of the developing roller is not more than the maximum dimension of the stopper in the axial direction of the developing roller.

3. The developer roller of claim 1, wherein in the axial direction of the developing roller, the two ends of the developing roller layer do not protrude beyond the two ends of the stopper.

4. The developer roller of claim 1, wherein the stopper comprises a first stopper portion, a second stopper portion, and a connecting portion for connecting the first stopper portion and the second stopper portion, a side surface of an axial end of the first stopper portion being formed as a first stopper surface, a side surface of an axial end of the second stopper portion being formed as a second stopper surface; neither the maximum radial dimension of the first stopper portion / first stopper surface nor the maximum radial dimension of the second stopper portion / second stopper surface is greater than the maximum radial dimension of the developing roller layer.

5. The developer roller of claim 4, wherein, the maximum radial dimension of the first stopper portion / first stopper surface is greater than the maximum radial dimension of the first end portion of the developing roller shaft, and the maximum radial dimension of the second stopper portion / second stopper surface is greater than the maximum radial dimension of the second end portion of the developing roller shaft.

6. The developer roller of claim 4, wherein in the axial direction of the developing roller, a first spacing is formed between the first side surface of the developing roller layer close to the axial end of the first stopper portion and the first stopper surface, and a second spacing is formed between the second side surface of the developing roller layer close to the axial end of the second stopper portion and the second stopper surface.

7. The developer roller of claim 4, wherein the maximum radial dimension of the first stopper portion / first stopper surface is not less than the maximum radial dimension of the connecting portion, and the maximum radial dimension of the second stopper portion / second stopper surface is not less than the maximum radial dimension of the connecting portion.

8. The developer roller of claim 7, wherein, the first stopper portion is further formed with a third stopper surface spaced apart from the first stopper surface, the third stopper surface being closer to the connecting portion than the first stopper surface is in the axial direction of the developing roller, the orientation of the first stopper surface being opposite to the orientation of the third stopper surface; the second stopper portion is further formed with a fourth stopper surface spaced apart from the second stopper surface, the orientation of the second stopper surface being opposite to the orientation of the fourth stopper surface, the fourth stopper surface being closer to the connecting portion than the second stopper surface is in the axial direction of the developing roller.

9. The developer roller of claim 8, wherein, when neither the first stopper portion nor the second stopper portion is covered / wrapped by the developing roller layer, the developing roller layer is located between the first stopper portion and the second stopper portion in the axial direction of the developing roller, the third stopper surface abuts against the first side surface of the developing roller layer, and the fourth stopper surface abuts against the second side surface of the developing roller layer.

10. A developing cartridge, characterized by, a developing housing and the developing roller according to any one of claims 1 to 9, the developing roller being rotatably provided in the developing housing, the developing roller being configured to supply a developer in the developing housing to an outside of the developing cartridge; the developing cartridge comprises a driving force receiving member for receiving a driving force from an image forming apparatus, the developing cartridge being provided with one end of the driving force receiving member as a driving end and an opposite end of the driving force receiving member as a non-driving end in the axial direction of the developing roller; The developing cartridge further includes a first bracket and a second bracket located on two sides of the developing housing respectively, the first bracket has a first mating surface facing the developing roller layer / non-driving end, the second bracket has a second mating surface facing the developing roller layer / driving end, and the first mating surface and the second mating surface are both used to abut against the stopper to limit movement of the developing roller in the axial direction thereof.

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