1. The processing box comprises a box body, a photosensitive drum and a developing roller, wherein the photosensitive drum and the developing roller are rotatably supported between two end walls of the box body, the axial end of the photosensitive drum is provided with a rotating force transmission assembly, the rotating force transmission assembly comprises a photosensitive drum gear and a coupling protrusion, the coupling protrusion is arranged at the axial end of the photosensitive drum gear, the axial end of the developing roller is provided with a developing roller gear assembly, and the rotating force transmission assembly and the developing roller gear assembly are positioned on the same side of the box body;

the method is characterized in that:

the developing roller gear assembly comprises a developing roller gear and a guide gear which are coaxially arranged, the developing roller gear is meshed with the photosensitive drum gear, the guide gear is positioned on one side of the developing roller gear, which is far away from the developing roller, the developing roller gear and the developing roller are relatively fixed in the circumferential direction, and the guide gear and the developing roller can relatively rotate in the circumferential direction;

in the axial direction of the photosensitive drum, the guide gear is located on one side of the rotating force transmission assembly, which is far away from the photosensitive drum.

2. A process cartridge according to claim 1, wherein:

the developing roller gear comprises a primary gear and a secondary gear which are coaxially arranged, the secondary gear is located between the primary gear and the guide gear, and the photosensitive drum gear is meshed with the primary gear.

3. A process cartridge according to claim 2, wherein:

the processing box further comprises a stirring frame and an intermediate gear, wherein a stirring frame gear is arranged at the axial end of the stirring frame, and the stirring frame gear is connected with the secondary gear through the intermediate gear.

4. A process cartridge according to claim 2, wherein:

in the axial direction of the photosensitive drum, the height of the primary gear is larger than that of the photosensitive drum gear.

5. A process cartridge according to any one of claims 2 to 4, wherein:

the first-stage gear and the second-stage gear are integrally formed.

6. A process cartridge according to any one of claims 1 to 4, wherein:

the guide gear is a straight gear or a helical gear.

7. A process cartridge according to any one of claims 1 to 4, wherein:

the axial end of the developing roller is also provided with a shaft head, the shaft head extends along the axial direction of the developing roller, and the cross section of the shaft head is non-circular;

the developing roller gear is provided with a first shaft hole in an axially penetrating manner, the shape of the cross section of the first shaft hole is the same as that of the cross section of the shaft head, and the developing roller gear is sleeved on the shaft head through the first shaft hole;

the guide gear is provided with a second shaft hole in an axial penetrating manner, and the cross section of the second shaft hole is circular.

8. A process cartridge according to claim 7, wherein:

an end cover is arranged at one end of the box body and covers the outside of the developing roller gear assembly, a supporting groove is formed in the end cover, and the shaft head extends into the supporting groove.

9. The method for installing the processing box comprises the steps that the processing box is detachably installed in an imaging device, the imaging device comprises a main machine, a box bin is arranged in the main machine, a transmission head is arranged on the side wall of the box bin, the transmission head comprises a gear part and a coupling concave part, the gear part is positioned on the peripheral wall of the transmission head, and the coupling concave part is positioned at the axial end of the transmission head;

the process cartridge according to any one of claims 1 to 8;

the method is characterized by comprising the following steps:

the gear part is meshed with the guide gear, and the guide gear supports the transmission head in the radial direction;

the coupling protrusion is engaged with the coupling recess.

Background

In order to improve the universality of the processing box and adapt to three electrophotographic imaging devices with different structures, the applicant discloses a processing box in the patent application with the publication number of CN110347029A, wherein the processing box is provided with a secondary gear at the end part of a developing roller, but in the actual use process, when a coupling protrusion of a photosensitive drum in the processing box is meshed with a transmission head with a gear, the transmission head can swing due to the fact that the length of the transmission head in the electrophotographic imaging device is long, and the free end contact of the box body and the transmission head in the process of installing the processing box, so that the coupling protrusion at the end part of the photosensitive drum is difficult to be jointed with the transmission head.

Disclosure of Invention

The invention mainly aims to provide a processing box with a smooth installation process.

Another object of the present invention is to provide a method of mounting the above process cartridge.

In order to achieve the main purpose, the processing box provided by the invention comprises a box body, a photosensitive drum and a developing roller, wherein the photosensitive drum and the developing roller are rotatably supported between two end walls of the box body; the developing roller gear assembly comprises a developing roller gear and a guide gear which are coaxially arranged, the developing roller gear is meshed with the photosensitive drum gear, the guide gear is positioned on one side of the developing roller gear, which is far away from the developing roller, the developing roller gear and the developing roller are relatively fixed in the circumferential direction, and the guide gear and the developing roller can relatively rotate in the circumferential direction; in the axial direction of the photosensitive drum, the guide gear is positioned on one side of the rotating force transmission assembly, which is far away from the photosensitive drum.

According to the scheme, due to the fact that the guide gear is arranged, when the box mounting machine is processed, the gear portion of the transmission head in the imaging device is firstly meshed with the guide gear, the guide gear guides and supports the transmission head from the lower side, and due to the support of the guide gear, the transmission head is always kept in a horizontal state, so that the transmission head can be accurately connected with the coupling protrusion of the rotating force transmission assembly, and the smooth mounting of the processing box and the stable transmission of the driving force are achieved. In addition, the guide gear and the developing roller can rotate relatively in the circumferential direction, and the developing roller gear and the developing roller are relatively fixed in the circumferential direction, so that after the installation of the processing box is completed, the guide gear is always in an idle rotation state of free rotation in the working process, and the transmission of the driving force cannot be influenced.

Preferably, the developing roller gear includes a primary gear and a secondary gear coaxially disposed, the secondary gear is located between the primary gear and the guide gear, and the photosensitive drum gear is engaged with the primary gear.

Therefore, as the primary gear is meshed with the photosensitive drum gear, the driving force received by the coupling protrusion is transmitted to the first gear through the photosensitive drum gear, and then transmitted to the developing roller through the primary gear and drives the developing roller to rotate.

The processing box further comprises a stirring frame and an intermediate gear, wherein the axial end of the stirring frame is provided with a stirring frame gear, and the stirring frame gear is connected with the secondary gear through the intermediate gear.

In the axial direction of the photosensitive drum, the height of the primary gear is larger than that of the photosensitive drum gear.

The further scheme is that the primary gear and the secondary gear are integrally formed.

Therefore, the number of parts is reduced, the assembly time is shortened, and the production efficiency is improved.

Preferably, the guide gear is a spur gear or a helical gear.

One preferred scheme is that the axial end of the developing roller is also provided with a shaft head, the shaft head extends along the axial direction of the developing roller, and the cross section of the shaft head is non-circular; the developing roller gear is provided with a first shaft hole in an axially penetrating manner, the shape of the cross section of the first shaft hole is the same as that of the cross section of the shaft head, and the developing roller gear is sleeved on the shaft head through the first shaft hole; the guide gear is provided with a second shaft hole in an axial penetrating manner, and the cross section of the second shaft hole is circular.

The further scheme is that an end cover is arranged at one end of the box body, the end cover covers the outside of the developing roller gear assembly, a supporting groove is formed in the end cover, and the shaft head extends into the supporting groove.

In order to achieve the above another object, the present invention provides a method for mounting the above process cartridge, wherein the process cartridge is detachably mounted in an image forming apparatus, the image forming apparatus includes a main body, a cartridge magazine is disposed in the main body, a transmission head is disposed on a side wall of the cartridge magazine, the transmission head includes a gear portion and a coupling recess, the gear portion is disposed on a peripheral wall of the transmission head, and the coupling recess is disposed at an axial end of the transmission head; process cartridge the process cartridge as described above; the installation method comprises the following steps: the gear part is meshed with a guide gear, and the guide gear supports the transmission head in the radial direction; the coupling protrusion is engaged with the coupling recess.

Drawings

FIG. 1 is a schematic view showing a configuration of a process cartridge according to an embodiment of the present invention after being engaged with a driving head of an image forming apparatus.

Fig. 2 is a structural view of a head in the image forming apparatus.

Fig. 3 is a partial view of an embodiment of the process cartridge of the present invention.

FIG. 4 is a left side view of an embodiment of the process cartridge of the present invention

Fig. 5 is a structural view of a rotational force transmitting assembly and a developing roller gear assembly in an embodiment of the process cartridge of the present invention.

The invention is further explained with reference to the drawings and the embodiments.

Detailed Description

Referring to fig. 1 to 5, the process cartridge is detachably mounted in the image forming apparatus, the electrophotographic image forming apparatus includes a main body, a cartridge chamber is provided in the main body, a door is provided on a chamber opening of the cartridge chamber, a driving head 10 is provided on a side wall of the cartridge chamber, the door is connected to the driving head 10, the driving head 10 extends toward the inside of the cartridge chamber when the door is closed, and the driving head 10 retracts toward the side wall when the door is opened. The transmission head 10 includes a gear portion 101 and a coupling recess 102, the gear portion 101 being located on a peripheral wall of the transmission head 10, and the coupling recess 102 being located at an axial end of the transmission head 10.

The processing box comprises a box body 1, a photosensitive drum 2, a developing roller 3, an agitating frame (not shown) and two intermediate gears 7, wherein the photosensitive drum 2, the developing roller 3 and the agitating frame are rotatably supported between two end walls of the box body 1, one axial end of the photosensitive drum 2 is provided with a rotating force transmission assembly 4, one axial end of the developing roller 3 is provided with a developing roller gear assembly 5, the axial end of the agitating frame is provided with an agitating frame gear 61, and the rotating force transmission assembly 4, the agitating frame gear 61 and the developing roller gear assembly 5 are positioned on the same side of the box body 1. One end of the box body 1 is provided with an end cover 11, and the end cover 11 covers the developing roller gear assembly 5 and the rotating force transmission assembly 4. The end cap 11 is provided with an opening 112 near the rotational force transmitting assembly 4, and a part of the developing roller gear assembly 5 is exposed from the opening 112.

The rotational force transmitting assembly 4 includes a photosensitive drum gear 41 and a coupling protrusion 42, the coupling protrusion 42 is provided at an axial end of the photosensitive drum gear 41, and the coupling protrusion 42 has a substantially triangular prism shape.

The developing roller gear assembly 5 includes a developing roller gear 51 and a guide gear 52 coaxially disposed, and the guide gear 52 is a helical gear. The guide gear 52 is located on the side of the developing roller gear 51 away from the developing roller 3, and the guide gear 52 is located on the side of the rotational force transmitting assembly 4 away from the photosensitive drum 2 in the axial direction of the photosensitive drum 2.

The developing roller gear 51 comprises a primary gear 511 and a secondary gear 512 which are coaxially arranged, the secondary gear 512 is positioned between the primary gear 511 and the guide gear 52, the photosensitive drum gear 41 is meshed with the primary gear 511, and the stirring frame gear 61 is in transmission connection with the secondary gear 512 through two intermediate gears 7. The height of the primary gear 511 is larger than the height of the drum gear 41 in the axial direction of the photosensitive drum 2 to achieve stable transmission of the driving force by the drum gear 41.

The developing roller gear 51 is fixed to the developing roller 3 in the circumferential direction, and the guide gear 52 is rotatable relative to the developing roller 3 in the circumferential direction. The axial end wall of the developing roller 3 is further provided with a shaft head 31, the shaft head 31 extends along the axial direction of the developing roller 3, the outer contour of the cross section of the shaft head 31 is defined by a major arc and a straight line, a first shaft hole is axially penetratingly arranged on the developing roller gear 51, the shape of the cross section of the first shaft hole is the same as that of the cross section of the shaft head 31, and the developing roller gear 51 is sleeved on the shaft head 31 through the first shaft hole and is in fit connection with the shaft head 31, so that the developing roller gear 51 and the developing roller 3 can be relatively fixed in the circumferential direction. The end cover 11 is provided with a supporting groove 111, and the shaft head 31 extends into the supporting groove 111 to support the developing roller 3.

The guide gear 52 is axially provided with a cylindrical second shaft hole 521 in a penetrating manner, the guide gear 52 is sleeved on the shaft head 31 through the second shaft hole 521, and the guide gear 52 can rotate relative to the shaft head 31 around the axis of the shaft head 31.

The method for mounting the process cartridge includes the following steps.

First, after the process cartridge is mounted to the cartridge magazine, the door cover of the image forming apparatus is in an open state, and the driving head 10 is in a retracted position.

Then, when the drive head 10 moves toward the case 1 along the axis after the door is closed, the gear portion 101 of the drive head 10 engages only with the guide gear 52, and the guide gear 52 can support the drive head 10 in the radial direction so that the axis of the drive head 10 is maintained in a horizontal state.

Then, with further movement of the power transmission head 10, the coupling protrusion 42 and the coupling recess 102 are butted in the axial direction, achieving accurate engagement of the power transmission head 10 with the rotational force transmitting assembly 4.

After the image forming apparatus starts to operate, the driving head 10 rotates, and the coupling recess 102 of the driving head 10 rotates the developing roller gear 51 and the developing roller 3. At the same time, the gear portion 101 of the transmission head 10 rotates the guide gear 52.

From top to bottom, owing to be provided with guide gear, when handling the box installation, the gear portion of the transmission head in the imaging device at first with guide gear meshing, guide gear leads and supports the transmission head from the downside, because guide gear's support, the transmission head remains the horizontality throughout to make the transmission head can be more accurate with the protruding joint of coupling of revolving force transmission subassembly, and then realize handling the smooth and easy installation of box and the stable transmission of drive power. In addition, the guide gear and the developing roller can rotate relatively in the circumferential direction, and the developing roller gear and the developing roller are relatively fixed in the circumferential direction, so that after the installation of the processing box is completed, the guide gear is always in an idle rotation state of free rotation in the working process, and the transmission of the driving force cannot be influenced.

In addition, the primary gear and the secondary gear may be two gears that are separated and arranged along the axial direction, or may be one gear that is integrally molded. The guide gear may also be a spur gear. The outer contour of the cross section of the shaft head can also be in other irregular shapes and non-circular shapes. The number of the intermediate gears can be one or more than two, or the intermediate gears are not needed, and the stirring frame gear is directly meshed with the secondary gear. The above-described modifications also achieve the object of the present invention.

Finally, it should be emphasized that the above-described preferred embodiments of the present invention are merely examples of implementations, not limitations, and various changes and modifications may be made by those skilled in the art, without departing from the spirit and scope of the invention, and any changes, equivalents, improvements, etc. made within the spirit and scope of the present invention are intended to be embraced therein.