CN215416273U

CN215416273U - Developing box

Info

Publication number: CN215416273U
Application number: CN202121200271.3U
Authority: CN
Inventors: 朱雨
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-11-28
Filing date: 2021-05-31
Publication date: 2022-01-04
Anticipated expiration: 2031-05-31

Abstract

A developing cartridge detachably mountable to a photosensitive drum cartridge having a photosensitive drum, the developing cartridge comprising: a housing; a developing roller; a first gear; an input portion capable of receiving an external driving force to rotate about an axis of the input portion to transmit the external driving force to the first gear; the developing cartridge further includes a first engaging member having a positioning portion with which the developing roller is rotatably connected and a first force receiving portion for receiving an external force to move the developing roller away from the photosensitive drum, the first force receiving portion being located between the first axis and the second axis when projected along the developing roller axis; the developing box with the structure solves the problem of inaccurate positioning caused by assembly error of the end cover in the prior art.

Description

Developing box

Technical Field

The present invention relates to a developing cartridge detachably mountable to a photosensitive drum cartridge provided with a photosensitive drum.

Background

An electrophotographic image forming apparatus is an apparatus for forming an image on a printing medium such as paper using the principle of electrophotography, such as a copying machine, a printer, a facsimile machine, and the like. There is a printer including a main body and a process cartridge detachably mounted in the main body, the process cartridge including a developing cartridge having a developing roller and a photosensitive drum cartridge having a photosensitive drum. The developing roller of the developing cartridge is in contact with the photosensitive drum to supply toner (e.g., toner) to the photosensitive drum when an image is formed, and is separated from the photosensitive drum to not supply toner to the photosensitive drum when an image is not formed.

A processing box comprises a photosensitive drum box and a developing box, wherein the developing box is detachably arranged on the photosensitive drum box. The photosensitive drum cartridge includes thereon: the developing device includes a photosensitive drum, a pair of separating members located on both sides of the photosensitive drum cartridge, respectively, and a pressing portion for applying pressure to the developing cartridge mounted therein. The developing cartridge includes a casing, a developing roller rotatably supported on the casing by a bearing member mounted on the casing, a first end cap and a second end cap mounted on both sides of the casing in a longitudinal direction, a driving unit provided at one end of the casing, a conductive unit provided at the other end of the casing, and force receiving portions provided on the first end cap and the second end cap for moving the developing roller away from the photosensitive drum. When the developing box is loaded into the photosensitive drum box, the pressure applying part on the photosensitive drum box applies pressure to the developing box to enable the developing roller to contact the photosensitive drum, the developing roller of the developing box needs to be separated from the photosensitive drum when an image is not formed, and at the moment, the separating components on the two sides of the photosensitive drum box respectively apply pressure to the force receiving parts to enable the developing roller to move away from the photosensitive drum.

Above-mentioned current developing box, because the part of casing both sides is more for the structure of end cover is complicated, and the end cover has assembly error easily when the assembly is on the casing, and the cooperation that appears both sides power receiving part and separation component easily locates inaccurately, the problem of separation developing roller and sensitization drum that can not be fine.

SUMMERY OF THE UTILITY MODEL

The main object of the present invention is to provide a developing cartridge with an improved structure to solve the technical problems in the background art.

In order to solve the problems, the utility model is realized by the following technical scheme:

a developing cartridge detachably mountable to a photosensitive drum cartridge having a photosensitive drum, said developing cartridge comprising: the developing device comprises a shell, a developing agent storage and a developing agent storage, wherein a developing agent bin for storing developing agent is arranged in the shell; a developing roller rotatably supported on the housing, the developing roller being disposed to face the photosensitive drum to supply the developer to the photosensitive drum, the developing roller having a first axis extending in an axial direction thereof, the housing having a first side and a second side opposite to the first side in the axial direction of the developing roller; a first gear disposed on the first side; an input portion having a second axis parallel to the first axis of the developing roller, capable of receiving an external driving force to rotate about the second axis of the input portion to transmit the external driving force to the first gear; the developing cartridge further includes a first engaging member having a positioning portion with which the developing roller is rotatably connected and a first force receiving portion for receiving an external force to move the developing roller away from the photosensitive drum, the first force receiving portion being located between a first axis and a second axis when projected along the first axis.

The specific scheme is that the first gear and the developing roller are coaxially arranged and fixedly connected; one of the first gear and the positioning portion is provided with a cylindrical protrusion, and the other is provided with a shaft hole provided coaxially with the developing roller, the protrusion being inserted into the shaft hole to rotatably connect the first gear with the first fitting member, the developing roller being rotatably connected with the positioning portion through the first gear.

More specifically, the developing roller includes a developing roller shaft, the positioning portion includes a shaft hole coaxially provided with the developing roller, and the developing roller shaft is rotatably inserted into the shaft hole.

Preferably, the developing cartridge further includes a first end cap disposed outside the housing in the longitudinal direction, and at least a part of the first fitting member is restricted between the developing roller and the first end cap on the same side as the first fitting member in the axial direction of the developing roller.

The positioning part is cylindrical, one part of the positioning part is a flange part arranged on the circumferential outer surface of the positioning part, one side of the flange part is abutted with the side wall of the shell, and the other side of the flange part is abutted with the end cover.

Further, the first engaging member may further include a stopper portion that blocks the first engaging member from rotating about the first axis when the developing roller rotates.

The first end cover is provided with a through groove, the stopping part is positioned in the through groove, and in the rotating process of the developing roller, the stopping part is abutted against the inner wall of the through groove to block the first matching component from rotating.

Preferably, the input portion further includes a circumferential outer wall, the stopper portion is provided on a side of the first force receiving portion facing the input portion, and the stopper portion abuts against the circumferential outer wall of the input portion to block the first fitting member from rotating during rotation of the developing roller.

Further, the first engaging member is provided on the first side of the housing, and the housing further includes a second force receiving portion on the second side, the second force receiving portion projecting from a side wall of the housing in a direction away from the housing.

Further, the first force receiving portion has a first face extending in a direction perpendicular to the facing direction, and the second force receiving portion has a second face extending in the direction perpendicular to the facing direction.

Further, the first surface overlaps with the developer carrying member when projected along the first axis, and the second surface overlaps with the developer carrying member when projected along the first axis.

The utility model has the beneficial effects that:

the utility model does not arrange the force receiving part on the end cover, thereby solving the problem of inaccurate positioning caused by assembly error of the end cover.

Drawings

Fig. 1 is a schematic structural view of a developing cartridge of embodiment 1 of the utility model;

fig. 2 is an exploded view of one side of a developing cartridge driving unit of embodiment 1 of the present invention;

fig. 3 is a schematic structural view of another angle of the developing cartridge of embodiment 1 of the utility model;

fig. 4 is an exploded view of one end of a conductive unit of the developing cartridge of embodiment 1 of the present invention;

fig. 5 is a schematic structural view of a first fitting member of the developing cartridge of embodiment 1 of the utility model;

fig. 6 is a schematic structural view of a developing cartridge of embodiment 1 of the present invention projected from a first side in the axial direction of a developing roller;

fig. 7 is a schematic structural view of a developing cartridge of embodiment 1 of the utility model projected from a second side in the axial direction of the developing roller;

fig. 8 is a partial exploded view of one end of the driving unit of the developing cartridge of embodiment 2 of the present invention;

fig. 9 is a partial structural view of one end of the conductive unit of the developing cartridge according to embodiment 3 of the present invention.

Detailed Description

The utility model is further illustrated by the following examples and figures.

Example 1

As shown in fig. 1, a structural schematic view of a developing cartridge 10 of the present invention is shown. For the sake of easy understanding of the specification, the directions of the developing cartridge 10 in the drawings are set for the description of the specification to follow, the front left direction in fig. 1 is the front, the opposite direction is the rear, the upper part of the front left direction in fig. 1 is the upper surface of the developing cartridge 10, the opposite direction is the lower surface of the developing cartridge 10, the upper left side in fig. 1 is the left side of the developing cartridge 10, and the lower right side in fig. 1 is the right side of the developing cartridge 10, wherein the front direction of the developing cartridge 10 faces the photosensitive drum cartridge, and the directions of "front", "rear", "left", "right", "up", "down" appearing in the respective components of the developing cartridge 10 and the developing cartridge 10 in the specification are all based on the directions shown in fig. 1.

As shown in fig. 1 to 4, the developing cartridge 10 is detachably mounted to a photosensitive drum cartridge (not shown in the drawings) having a photosensitive drum, the photosensitive drum cartridge being detachably mounted in a main body of the electrophotographic image forming apparatus. The developing cartridge 10 includes a casing 1, a developing roller 2, a driving unit 3, a conductive unit 4, an end cap, a first fitting member 6, and a second force receiving portion 7.

A developer cartridge for storing developer is provided in the casing 1, and the right side of the casing 1 has a first side wall 11 and the left side of the casing 1 has a second side wall 12 in the longitudinal direction (i.e., the left-right direction in the drawing) of the casing 1. The developing roller 2 is disposed on the front side of the developing cartridge 10, the developing roller 2 includes a developing roller shaft 21 and a developing roller main body portion 22 for carrying developer supported on the outer circumferential side of the developing roller shaft 21, the developing roller 2 has a first axis a1 extending in the axial direction thereof, the developing roller shaft 21 is supported on the casing 1 and is rotatable about the first axis a1, and the developing roller 2 faces the photosensitive drum in a state of being mounted on the photosensitive drum cartridge to supply the developer to the photosensitive drum.

The casing 1 has a first side 14 and a second side 15 opposite to the first side 14 in the developing roller axial direction, and the driving unit 3 is provided on the first side 14 of the casing 1 for coupling with a driving head of an electrophotographic image forming apparatus (not illustrated in the drawings) to receive a driving force for driving a rotary member such as the developing roller 2 to rotate. The conductive unit 4 is located at the second side 15 of the housing 1 for receiving power from the image forming apparatus. The end cap of the developing cartridge 10 includes a first end cap 8 and a second end cap 9, the first end cap 8 is mounted on a first side 14 of the casing 1 to cover the outside of the driving unit 3, the second end cap 9 is mounted on a second side 15 of the casing 1, and a detecting device that can cover the second side 15.

The first fitting member 6 of the present embodiment is provided on the first side 14, the developing roller 2 is rotatably connected with the first fitting member 6, and the first fitting member 6 is for receiving a separating force to move the developing roller 2 away from the photosensitive drum. In the present embodiment, the second force receiving portion 7 is provided on the second side 15 for receiving the separating force for moving the developing roller 2 away from the photosensitive drum, as with the first engaging member 6.

As shown in fig. 2, the driving unit 3 includes an input portion 31 and a first gear 32, the input portion 31 is rotatably mounted on the first side 14 of the housing 1 for coupling with a driving head of the electrophotographic image forming apparatus to receive a driving force, and the driving force is transmitted to the first gear 32 such that the first gear 32 rotates. The input 31 has a second axis a2 parallel to the first axis a1 and is rotatable about a second axis a 2. In this embodiment, the first gear 32 is a developing roller gear 32 fixedly connected with one end of the developing roller shaft 21, the developing roller gear 32 is located on the first side 14 of the casing 1, a first gear portion 321 is provided, and a cylindrical protrusion 322 rotatably connected with the first fitting member 6 is provided on the second end face 323 away from the casing 1, the cylindrical protrusion 322 is coaxially arranged with the developing roller 2, that is, the axis of the cylindrical protrusion 322 coincides with the first axis a1 of the developing roller 2. The first gear portion 321 of the first gear 32 meshes with the second gear portion 311 of the input portion 31 to receive the driving force, thereby driving the developing roller 2 to rotate.

As shown in fig. 2 and 5, the first engaging member 6 has a positioning portion 61, a first force receiving portion 62, and a stopper portion 63, the positioning portion 61 includes a substantially columnar main body portion 611 and a circular shaft hole 612 located inside the main body portion 611, the main body portion 611 is provided with a flange portion 613 on a circumferential outer wall near one end of the developing roller 2, and an extending portion 614 extending in a direction near the second axis L2, the shaft hole 612 and the cylindrical protrusion 322 on the developing roller gear 32 are fitted to each other and coaxially provided, the cylindrical protrusion 322 on the developing roller gear 32 is rotatably inserted into the shaft hole 612 to rotatably connect the first gear 32 and the first engaging member 6, and positioning between the first engaging member 6 and the developing roller 2 is achieved. Of course, a shaft hole may be provided at one end of the first gear 32, and a projection rotatably connected to the shaft hole may be provided at the positioning portion 61 of the first engaging member 6. In a state where the first fitting member 6 is positioned to the first gear 32 through the shaft hole 612, the circumferential outer wall of the cylindrical protrusion 322 and the circumferential inner wall of the shaft hole 612 can be brought into close contact, so that the developing roller 2 can be synchronously brought to move away from the photosensitive drum when the first fitting member 6 is subjected to the force of the separating member of the photosensitive drum cartridge. In the axial direction of the developing roller 2, one side of the flange portion 613 abuts against the second end face 323 of the first gear 32 and the other side abuts against the first end cover 8, so that the flange portion 613 is restrained between the first end cover 8 and the first gear 32, that is, between the developing roller 2 and the first end cover 8, and therefore further, the movement of the first engaging member 6 along the first axis a1 is restrained, and there is also a restraint on the first engaging member 6 in the rotational direction of the developing roller 2, and therefore the position of the first engaging member 6 can be defined, achieving accurate positioning.

The first force receiving portion 62 is for receiving a force of the separation member on the photosensitive drum cartridge to move the developing roller 2 away from the photosensitive drum. The first force receiving portion 62 is bent from the extension portion 614 and extends in a direction parallel to the first axis a1, and when projected along the first axis a1, the first force receiving portion 62 is located between the developing roller axis a1 and the second axis a2 of the input portion 31 (refer to fig. 6), that is, projected on a plane perpendicular to the first axis a1, and the first force receiving portion 62 is located between the developing roller axis a1 and the second axis a2 of the input portion 31.

The stopper 63 serves to block the first fitting member 6 from rotating when the first fitting member 6 rotates about the first axis a1, and in this embodiment, the stopper 63 is provided on the upper and lower side surfaces of the first fitting member 6. The first cover 8 is provided with a through groove 81 through which the first fitting member 6 is exposed, and the stoppers 63 of the first fitting member 6 are located in the through groove 81 and contact both side inner walls of the through groove 81 to block the first fitting member 6 from rotating about the first axis a 1. In the rotation process of the developing roller 2, the stopper 63 abuts against the inner wall of the through groove 81 to block the rotation of the first matching member 6, and the setting of the stopper 63 can not only block the rotation of the first matching member 6 along with the developing roller 2 when the developing roller 2 rotates, but also further avoid the rotation of the first matching member 6 due to the gravity of the first matching member itself, so that the positioning of the first matching member 6 is more accurate, and the positioning of the first matching member and the positioning of the separating member are more accurate in the state of being installed in the photosensitive drum box.

The stop portion 63 is preferably disposed to contact with the inner walls of the through slot 81, and the stop portion 63 may be in clearance fit with the inner walls of the through slot 81. The stopper 63 may also be configured to contact other components of the developing cartridge 10, such as a casing, an input portion, etc., when the developing roller 2 rotates, to block the first fitting member 6 from rotating. For example, the stopper 63 is provided on the side of the first force receiving portion 62 facing the input portion 31 (see reference numeral P in fig. 5), and the stopper 63 extends outward of the circumferential outer wall of the input portion 31 so as to contact or abut against the circumferential outer wall of the input portion 31 when the first engaging member 6 rotates, thereby blocking the rotation of the first engaging member 6.

As shown in fig. 3 and 4, the conductive unit 4 includes a conductive bracket 41, the conductive bracket 41 being installed between the housing 1 and the second end cap 9, the conductive bracket 41 being capable of receiving power from the image forming apparatus, the conductive bracket 41 being provided with a through hole 42.

The casing 1 further comprises a second force receiving portion 7 located at the second side 15, the second force receiving portion 7 protruding from the second side wall 12 of the casing 1 in a direction away from the second side wall 12 and passing through the through hole 42 of the conductive bracket 41, the first force receiving portion 62 being located between the developing roller first axis a1 and the second axis a2 of the input portion 31 when projected along the first axis a1 (refer to fig. 7). Since the second force receiving part 7 is not provided on the second end cap 9 but directly on the housing 1, the problem of inaccurate positioning of the mating part and the separate member due to inaccurate assembly of the second end cap 9 can be avoided.

Referring to fig. 6 and 7, when the developing cartridge 10 is loaded into the photosensitive drum cartridge, the developing roller 2 faces the photosensitive drum in the front direction of the developing cartridge 10, and the first force receiving portion 62 has a first face 621 extending in a direction perpendicular to the facing direction. The second force receiving portion 7 has a second face 71 extending in a direction perpendicular to the facing direction. The first face 621 overlaps the developing roller 2 when projected along the first axis a1, and the second face 71 overlaps the developing roller 2 when projected along the first axis a 1.

The developing roller 2 of the developing cartridge 10 is in contact with the photosensitive drum to supply toner (e.g., toner) to the photosensitive drum when an image is formed, and is separated from the photosensitive drum to not supply toner to the photosensitive drum when an image is not formed. When the image forming apparatus is in operation, the developing cartridge 10 is loaded into the photosensitive drum cartridge, the developing roller 2 is in contact with the photosensitive drum, when the developing roller 2 does not form an image, the developing roller 2 needs to be separated from the photosensitive drum, a pair of separating members (not shown) on the photosensitive drum respectively press the first force receiving part 62 and the second force receiving part 7 through contact with the first surface 621 and the second surface 71, the first matching member 6 transmits force to the developing roller gear 32 through the positioning part 61, the developing roller 2 is synchronously driven by the developing roller gear 32, and the second force receiving part 7 applies force on the housing 1, so that the developing roller 2 is moved away from the position where the photosensitive drum is in contact, and the developing roller 2 is separated from the photosensitive drum.

In the present embodiment, the positioning portion 61 of the first engaging member 6 is provided coaxially with the developing roller 2 and rotatably connected by the developing roller gear 32, and the first engaging member 6 can move the developing roller 2 more promptly when receiving an external force than the case where the force receiving portion is provided on the end cover. Further, since the first fitting member 6 is not directly mounted on the end cap, it is possible to reduce the problem of inaccurate positioning with the separation fixture on the photosensitive drum cartridge due to an assembly error of the end cap.

Example 2

Embodiment 2 is a modification made on the basis of embodiment 1.

As shown in fig. 8, the first gear of embodiment 2 does not have a cylindrical projection portion fitted with the shaft hole 612 of the first fitting member 6, the developing roller shaft 21 is provided longer than that of embodiment 1, the developing roller shaft 21 projects from one end of the first gear 32 in a state where the first gear 32 is fixedly mounted on the developing roller shaft 21 of the developing roller 2, and the circular shaft hole 612 of the first fitting member 6 is fitted on the developing roller shaft 21 and is provided coaxially with the developing roller 2, so that the developing roller 2 and the first fitting member 6 are rotatably connected.

When the developing roller 2 needs to be separated from the photosensitive drum without forming an image, and the separating member on the photosensitive drum cartridge acts on the first engaging member 6, the positioning portion 61 of the first engaging member 6 directly exerts a force on the developing roller shaft 21, so that the developing roller 2 is moved apart relative to the photosensitive drum.

Example 3

Embodiment 3 is a modification made on the basis of embodiment 1. As shown in fig. 9, the main difference is that embodiment 3 provides the first fitting member 6 on both the first side and the second side 15 of the housing 1.

The first engaging member on the first side of the casing 1 is the same as that of embodiment 1, the first engaging member 6 on the second side 15 of the casing 1 is fitted to the end of the developing roller shaft 21 of the developing roller 2, and one end of the flange portion 613 is pressed against the second side wall 12 of the casing 1 and the other end is abutted against the second end cap 9, so that the movement of the first engaging member 6 in the developing roller axial direction is restricted. The fitting relationship of the first fitting member 6 and the second end cap 9 is the same as that of embodiment 1 to restrict the rotation of the first fitting member 6.

When no image is formed, the developing roller 2 needs to be separated from the photosensitive drum, the separating member on the photosensitive drum cartridge acts on the first engaging members 6 on both sides of the housing 1, the positioning portion of the first engaging member on the first side directly exerts a force on the developing roller gear, and the first engaging member 6 on the second side 15 exerts a force on the developing roller shaft 21, so that the developing roller 2 moves and separates relative to the photosensitive drum.

The above embodiments are merely provided to illustrate the technical solutions of the present invention, and not to limit the same, wherein the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as limiting in number, and the "first", "second", and the like may be one or may include a plurality according to the description of the specification. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; for example, the second force receiving portion of the embodiment may be provided on the housing, or the first engaging member may be provided on both sides, or the first engaging member of the embodiment may be provided on one side and the second force receiving portion of the embodiment may be provided on the other side; such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A developing cartridge detachably mountable to a photosensitive drum cartridge having a photosensitive drum, said developing cartridge comprising:

the developing device comprises a shell, a developing agent storage and a developing agent storage, wherein a developing agent bin for storing developing agent is arranged in the shell;

a developing roller rotatably supported on the housing, the developing roller being disposed to face the photosensitive drum to supply the developer to the photosensitive drum, the developing roller having a first axis extending in an axial direction thereof, the housing having a first side and a second side opposite to the first side in the axial direction of the developing roller;

a first gear disposed on the first side;

an input portion having a second axis parallel to the first axis of the developing roller, capable of receiving an external driving force to rotate about the second axis of the input portion to transmit the external driving force to the first gear;

the developing cartridge further includes a first engaging member having a positioning portion and a first force receiving portion, the developing roller being rotatably connected with the positioning portion, the first force receiving portion being configured to receive an external force to move the developing roller away from the photosensitive drum, the first force receiving portion being located between a first axis and a second axis when projected along the first axis.

2. A developing cartridge according to claim 1, wherein said first gear is coaxially provided with and fixedly connected to said developing roller; one of the first gear and the positioning portion is provided with a cylindrical protrusion, and the other is provided with a shaft hole provided coaxially with the developing roller, the protrusion being inserted into the shaft hole to rotatably connect the first gear with the first fitting member, the developing roller being rotatably connected with the positioning portion through the first gear.

3. A developing cartridge according to claim 1, wherein said developing roller includes a developing roller shaft, and said positioning portion includes a shaft hole provided coaxially with said developing roller, and said developing roller shaft is rotatably inserted into said shaft hole.

4. A developing cartridge according to claim 1, further comprising a first end cap disposed outside said casing in a longitudinal direction, wherein at least a part of said first fitting member is restricted between said developing roller and said first end cap on the same side as said first fitting member in an axial direction of said developing roller.

5. A developing cartridge according to claim 4, wherein said positioning portion has a cylindrical shape, said portion is a flange portion provided on a circumferential outer surface of said positioning portion, one side of said flange portion abuts against a side wall of said casing, and the other side abuts against said first end cap.

6. A developing cartridge according to claim 4, wherein said first engaging member further includes a stopper portion that blocks rotation of said first engaging member about said first axis when said developing roller rotates.

7. A developing cartridge according to claim 6, wherein said first end cover is provided with a through groove, and said stopper portion is located in said through groove, and abuts against an inner wall of said through groove to block rotation of said first fitting member during rotation of said developing roller.

8. A developing cartridge according to claim 6, wherein said input portion further includes a circumferential outer wall, and said stopper portion is provided on a side of said first force receiving portion facing the input portion, and abuts against said circumferential outer wall of said input portion to block rotation of said first engaging member during rotation of said developing roller.

9. A developing cartridge according to any one of claims 1 to 8, wherein said first fitting member is provided at said first side of said casing, and said casing further includes a second force receiving portion at said second side, said second force receiving portion projecting from a side wall of said casing in a direction away from said casing.

10. A developing cartridge according to claim 9, wherein said first force receiving portion has a first face extending in a direction perpendicular to said facing direction, and said second force receiving portion has a second face extending in a direction perpendicular to said facing direction; the first face overlaps the developer carrier when projected along the first axis, and the second face overlaps the developer carrier when projected along the first axis.