CN108153127B

CN108153127B - Developing unit, process cartridge and electrophotographic apparatus

Info

Publication number: CN108153127B
Application number: CN201711462484.1A
Authority: CN
Inventors: 龚海飞; 曹玉兵
Original assignee: Zhuhai Pantum Electronics Co Ltd
Current assignee: Zhuhai Pantum Electronics Co Ltd
Priority date: 2017-12-28
Filing date: 2017-12-28
Publication date: 2021-05-04
Anticipated expiration: 2037-12-28
Also published as: CN108153127A

Abstract

The invention provides a developing unit, a process cartridge and an electronic imaging device, and relates to the image forming technology. The forced pushing assembly is rotationally connected with the developing shell, and the abutting part in the forced pushing assembly abuts against the photosensitive shell, so that the forced pushing assembly has more arrangement spaces outside the developing shell while the photosensitive drum is ensured to be in close contact with or close to the developing roller, the occupation of the space of the developing bin in the developing shell is greatly reduced, the space of the waste powder recovery bin in the photosensitive shell is not occupied, and the capacity loss of the developing bin and the waste powder recovery bin is greatly reduced.

Description

Developing unit, process cartridge and electrophotographic apparatus

Technical Field

The present invention relates to image forming technologies, and in particular, to a developing unit, a process cartridge, and an electronic image forming apparatus.

Background

An electrophotographic apparatus, such as a laser printer, a copier, a printer, etc., is an apparatus for forming an image on an image medium, such as a sheet of paper, and generally includes: an image forming apparatus main body and a process cartridge detachably mounted in the image forming apparatus main body; the imaging device main body is used for acquiring printing data and converting the printing data into corresponding laser signals; the processing box is used for developing and imaging according to the laser signal.

To achieve development and image formation, the process cartridge generally includes: the developing unit is rotationally connected with the photosensitive unit through a rotating shaft. The developing unit comprises a developing shell, a developing roller is arranged on the front side of the developing shell facing the imaging device main body, a developing bin is arranged on the rear side of the developing shell, and the developing bin is used for providing carbon powder for the developing roller; the sensitization unit specifically includes the sensitization casing, and the front side of sensitization casing is provided with the sensitization drum, and the rear side of sensitization casing is provided with useless powder and retrieves the storehouse, and useless powder is retrieved the storehouse and is used for retrieving the carbon powder that does not participate in the formation of image on the sensitization drum.

In a specific imaging process, the photosensitive drum can form a corresponding charge latent image on the surface of the photosensitive drum according to a laser signal of the imaging device body; when the photosensitive drum rotates and passes through the developing roller, the latent image part on the surface of the photosensitive drum adsorbs carbon powder from the surface of the developing roller to form a carbon powder real image; when the carbon powder real image carried by the photosensitive drum rotates to the corresponding position of the paper, the paper subjected to electrostatic treatment can adsorb the carbon powder to the surface of the paper, so that an image is formed on the paper surface.

In the prior art, in order to ensure good contact between a photosensitive drum and a developing roller and improve imaging quality, a pushing mechanism such as a spring is arranged between the rear side of a developing shell and the rear side of the photosensitive shell; under the action of the spring, the rear side of the developing shell and the rear side of the photosensitive shell can move back and forth; meanwhile, under the action of the rotating shaft, the front side of the developing shell moves and offsets with the front side of the photosensitive shell in the opposite direction, so that the developing roller on the front side of the developing shell can be in contact with or close to the photosensitive drum on the front side of the photosensitive shell.

However, in the existing process cartridge, the developing housing and the photosensitive housing are both required to be provided with mounting structures for mounting the urging mechanism, so that the structures of the developing housing and the photosensitive housing are more complicated, the demolding efficiency of the developing housing and the photosensitive housing is reduced, and the production efficiency of the process cartridge is reduced. Moreover, since a certain installation space is required to be reserved between the rear side of the developing housing and the rear side of the photosensitive housing for installing the spring, the capacity loss of the developing chamber at the rear side of the developing housing or the waste toner recovery chamber at the rear side of the photosensitive housing is caused, and the problem is particularly remarkable when the device needs to be miniaturized.

Disclosure of Invention

The present invention has been made to address the above-mentioned deficiencies in the prior art and to provide a developing unit, a process cartridge, and an electronic image forming apparatus that can solve at least one of the above-mentioned problems.

An aspect of the present invention provides a developing unit detachably attached to a photosensitive unit, the developing unit being rotatably connected to the photosensitive unit with a first rotating shaft therebetween, the developing unit including: a developing housing and a developing roller rotatably supported on the developing housing, the photosensitive unit including: the device comprises a photosensitive shell and a photosensitive drum which is rotatably supported on the photosensitive shell; the developing device is characterized in that a forcing component is further arranged on the developing shell and is rotationally connected with the developing shell, the forcing component comprises a pressing portion and a butting portion, the butting portion is abutted to the photosensitive shell and urges the developing unit to rotate relative to the photosensitive unit around the first rotating shaft under the forcing of the pressing portion, and the photosensitive drum is close to or abutted to the developing roller.

Optionally, the urging assembly is located on the other side of the developing roller relative to the first rotating shaft.

Optionally, a direction of an acting force of the abutting portion on the photosensitive housing is perpendicular to a connecting line between the abutting portion and the acting point on the photosensitive housing and the first rotating shaft.

Optionally, a light incident port is further arranged between the forced pushing assembly and the developing shell, and the light incident port is used for enabling incident light to be incident on the photosensitive drum.

Optionally, the urging assembly further includes a rotating portion rotatably connected to the developing housing, and the abutting portion is fixedly connected to the rotating portion.

Optionally, the rotating portion is a handle body protruding from the developing housing; the butt joint part is a supporting arm, one end of the supporting arm is fixedly connected with the handle main body, and the other end of the supporting arm is in butt joint with the photosensitive shell.

Optionally, the developing housing has a driving end provided with a transmission gear, and a non-driving end disposed opposite to the driving end; the driving end and the non-driving end are respectively provided with the pressurizing part, and the forcing force provided by the pressurizing part arranged at the driving end is larger than the forcing force provided by the pressurizing part arranged at the non-driving end.

Optionally, the pressing part is an elastic member.

Optionally, the elastic component is a torsion spring, the torsion spring is rotatably connected with the developing shell through a torsion spring rotating shaft, a first arm of the torsion spring is fixedly connected with the handle main body, and a second arm of the torsion spring is abutted to the developing shell.

Optionally, both ends of the handle main body are respectively provided with a fixing column, and the first arm of the torsion spring is fixedly arranged on the fixing column.

Optionally, one end of the fixing column facing away from the handle main body is provided with a flange extending in an axial direction perpendicular to the fixing column to limit the torsion spring from moving in a direction facing away from the handle main body.

Optionally, the elastic member is a pressure spring, one end of the pressure spring abuts against the developing housing, and the other end of the pressure spring abuts against the supporting arm.

Optionally, the development casing still includes the development side cap, be provided with the spout face on the development side cap and be located the first shaft hole of spout face downside, be provided with first pivot on the sensitization casing, first pivot is followed the slot face telescopically is installed first shaft hole.

Optionally, a stroke of the abutting portion under the urging action of the pressing portion is greater than or equal to a distance between the first rotating shaft and the first shaft hole along the tail end of the sliding groove surface.

Another aspect of the present invention provides a process cartridge comprising: the developing device comprises a developing unit and a photosensitive unit which can be disassembled and assembled with each other, wherein a first rotating shaft is arranged between the developing unit and the photosensitive unit and is rotatably connected through the first rotating shaft; the photosensitive unit includes: the device comprises a photosensitive shell and a photosensitive drum which is rotatably supported on the photosensitive shell; the developing unit is the developing unit of any one of the preceding claims.

Yet another aspect of the present invention provides an electronic imaging device, comprising: the processing box comprises a developing unit and a photosensitive unit which can be mutually disassembled and assembled, the processing box is detachably arranged in the imaging device body, and the developing unit is any one of the developing units.

According to the developing unit, the processing box and the electronic imaging device, the urging assembly is rotationally connected with the developing shell, and the abutting part in the urging assembly is abutted against the photosensitive shell, so that the pressurizing part can urge the abutting part to rotate relative to the developing shell in the process that the urging assembly rotates relative to the developing shell, the developing unit and the photosensitive unit are urged to rotate relatively around the first rotating shaft through the rotation of the abutting part relative to the developing shell, the photosensitive drum is pressed to the developing roller and is in close contact or close to each other, and good developing performance is guaranteed.

Meanwhile, the forced pushing assembly is rotatably arranged on the developing shell, the forced pushing assembly has more space which is arranged outside the developing shell, so that the occupation of the space of the developing bin in the developing shell is greatly reduced, the space of the waste powder recovery bin in the photosensitive shell is not occupied, and the capacity loss of the developing bin and the waste powder recovery bin is greatly reduced.

Drawings

FIG. 1 is a schematic view of an electrophotographic apparatus including a developing unit provided in an embodiment described below;

fig. 2 is a schematic structural view of a process cartridge including a developing unit provided in the first embodiment;

FIG. 3 is a schematic structural diagram of a photosensitive unit assembled with a developing unit provided in one embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a developing unit according to a first embodiment of the present invention;

FIG. 5 is an enlarged view of a portion of FIG. 4;

FIG. 6 is a cross-sectional view of the first embodiment of the present invention before the developing unit and the photosensitive unit are assembled;

FIG. 7 is a cross-sectional view of the developing unit and the photosensitive unit provided in one embodiment of the present invention when assembled in place;

FIG. 8 is a schematic diagram illustrating an acting force between the contact portion and the photosensitive unit in the developing unit according to the first embodiment;

FIG. 9 is a schematic view of the installation of a pushing assembly in a developing unit according to a first embodiment;

FIG. 10 is a schematic structural diagram of a developing unit and a photosensitive unit provided in the first embodiment before being assembled in place;

FIG. 11 is a schematic structural view illustrating a developing unit and a photosensitive unit assembled in place according to an embodiment of the present invention;

fig. 12 is a first schematic view illustrating the first embodiment of the present invention showing the matching between the corresponding side cover and the first rotating shaft;

fig. 13 is a second schematic view illustrating the matching between the corresponding side cover and the first rotating shaft according to the first embodiment;

FIG. 14 is a cross-sectional view at C-C of FIG. 13;

fig. 15 is a schematic structural diagram of a developing unit and a photosensitive unit according to the second embodiment.

Description of reference numerals:

1-a developing unit; 11-a developing housing; 11 a-development-side cover; 111-a developer roller; 112-powder feeding roller; 113-a developing chamber; 114-a stirring device; 115-a first shaft hole; 116-a chute; 116 a-a chute face; 117-compression spring; 118-a guide slot; 119-chip; 120-a drive gear;

13-a thrust assembly; 131-a pressing part 1311-a torsion spring; 1311 a-first arm; 1311 b-second arm; 1312-an elastic member; 132-an abutment; 1321-a support arm; 133-a handle body; 1331-torsion spring shaft; 1332-a second shaft; 1333-fixing the column; 1334-flange;

2-a light sensing unit; 21-a photosensitive shell; 211-a photosensitive drum; 212-waste powder recovery bin; 213-a charging roller; 214-a first shaft; 215-guide post;

3-an image forming apparatus main body; 31-an exposure unit; 32-in a paper tray; 33-a paper feeding unit; 34-a fixing unit; 35-a paper discharge unit; 36-paper discharge tray.

Detailed Description

Fig. 1 is a schematic structural view of an electrophotographic apparatus including a developing unit provided in an embodiment described below. Referring to fig. 1, the electronic imaging apparatus generally includes: an image forming apparatus main body 3, and a process cartridge including a developing unit 1 and a photosensitive unit 2, the process cartridge being detachably mounted in the image forming apparatus main body 3.

The image forming apparatus main body 3 specifically includes: an exposure unit 31, a paper carrying tray 32, a paper feeding unit 33, a fixing unit 34, a paper discharging unit 35, a paper discharging tray 36; the developing unit 1 and the photosensitive unit 2 constitute a process cartridge after being assembled and are detachably mounted in the image forming apparatus main body 3. The photosensitive unit 2 has a photosensitive drum therein, and the developing unit 1 has a developing roller therein and a chip which can be communicatively connected to a processor in the image forming apparatus main body 3.

Taking an electronic imaging device as an example of a printer, in a specific working process, the imaging device body 3 acquires printing information from a terminal such as a computer and the like, generates a bitmap of a page to be printed, converts the bitmap into a laser pulse signal and sends the laser pulse signal to the exposure unit 31, and the exposure unit 31 scans a laser beam on the surface of a photosensitive drum according to the laser signal so as to form a charge latent image on the photosensitive drum; when the photosensitive drum rotates and passes through the developing roller, the latent image part of the photosensitive drum adsorbs carbon powder from the surface of the developing roller to form a carbon powder real image; meanwhile, the paper on the paper carrying tray 32 enters the conveying channel under the action of the paper feeding unit 33, and when the toner image on the photosensitive drum rotates to the corresponding position of the paper, the paper subjected to electrostatic treatment can adsorb the toner onto the surface of the paper, so that an image is formed on the paper.

Generally, in order to stabilize an image on a sheet, the sheet is heated by the fixing unit 34 when the sheet is fed out, so that components such as resin in the toner are rapidly dissolved at a high temperature, and the toner is firmly adsorbed on the surface of the sheet; the passed fixing unit 34 is output from the electronic image forming apparatus by the sheet discharging unit 35 and carried on the sheet discharging tray 36, completing the printing job.

The structure, function, and cooperation with the photosensitive unit 2 of the developing unit 1 will be described in detail below.

Example one

Fig. 2 is a schematic structural view of a process cartridge including a developing unit provided in the first embodiment; FIG. 3 is a schematic structural diagram of a photosensitive unit assembled with a developing unit provided in one embodiment of the present invention; FIG. 4 is a schematic structural diagram of a developing unit according to a first embodiment of the present invention; fig. 5 is an enlarged view of a portion of fig. 4.

FIG. 6 is a cross-sectional view of the first embodiment of the present invention before the developing unit and the photosensitive unit are assembled; FIG. 7 is a cross-sectional view of the developing unit and the photosensitive unit provided in one embodiment of the present invention when assembled in place; fig. 8 is a schematic diagram of the acting force between the contact portion and the photosensitive unit in the developing unit according to the first embodiment.

FIG. 9 is a schematic view of the installation of a pushing assembly in a developing unit according to a first embodiment; FIG. 10 is a schematic structural diagram of a developing unit and a photosensitive unit provided in the first embodiment before being assembled in place; fig. 11 is a schematic structural diagram of the developing unit and the photosensitive unit provided in the first embodiment when they are assembled in place.

Referring to fig. 2-11, the present embodiment provides a developing unit 1 detachably mounted on a photosensitive unit 2, a first rotating shaft 214 is disposed between the developing unit 1 and the photosensitive unit 2 and rotatably connected through the first rotating shaft 214, the developing unit 1 includes: a developing casing 11 and a developing roller 111 rotatably supported on the developing casing 11, the photosensitive unit 2 including: a photosensitive housing 21 and a photosensitive drum 211 rotatably supported on the photosensitive housing 21; the developing shell 11 is further provided with a pushing assembly 13 rotatably connected with the developing shell 11, the pushing assembly 13 includes a pressing portion 131 and a contact portion 132, the contact portion 132 contacts with the photosensitive shell 21 and pushes the pressing portion 131 to enable the developing unit 1 and the photosensitive unit 2 to rotate around the first rotating shaft 214, so that the photosensitive drum 211 and the developing roller 111 are close to or contact with each other.

The developing casing 11 specifically includes: a development-side cover 11a, a development top cover, and a development bottom cover. The two development side covers 11a are respectively arranged at two ends of the development roller 111 along the axial direction, and the development top cover and the development bottom cover are oppositely arranged along the up-down direction of the development roller 111; the left end and the right end of the developing bottom cover are respectively connected with the two developing side covers 11a, the rear end of the developing bottom cover is connected with the rear end of the developing top cover, the left end and the right end of the developing top cover are respectively connected with the two developing side covers 11a, the developing top cover and the developing bottom cover jointly form a developing bin 113 with an opening, and the developing bin 113 is used for containing a developer which can be single-component carbon powder or double-component carbon powder as a specific embodiment of the developer.

The developing roller 111 is specifically accommodated at an opening of the developing hopper 113, and both ends of the developing roller 111 are rotatably supported on the two development-side covers 11a through bearings, respectively. The developing unit 1 further includes a powder feeding roller 112, a stirring device 114, and a chip 119 for communication connection with the image forming apparatus main body 3; the powder feeding roller 112 is provided on a side of the developing roller 111 facing the developing hopper 113, and both ends of the powder feeding roller 112 are rotatably supported on the two developing-side covers 11a through bearings, respectively; an agitating device 114 may be provided in the developing hopper 113 for conveying the developer inside the developing hopper 113 to the powder feeding roller 112.

The photosensitive case 21 specifically includes: sensitization side cap, sensitization top cap and sensitization bottom, the sensitization side cap is two, and sensitization side cap, sensitization top cap and sensitization bottom enclose jointly and enclose into the useless powder that has the open-ended and retrieve storehouse 212, and useless powder is retrieved storehouse 212 and is used for retrieving the carbon dust that does not participate in the formation of image on the sensitization drum 211. The photosensitive drum 211 is specifically provided at an opening of the photosensitive housing 21, and both ends of the photosensitive drum 211 are rotatably supported on the two photosensitive side covers through bearings, respectively. The photosensitive unit 2 further includes a charging roller 213, both ends of the charging roller 213 are rotatably supported on the two photosensitive side covers by bearings, respectively, and the charging roller 213 is pressed against the surface of the photosensitive drum 211 by a spring.

The developing side cover 11a is provided with a first shaft hole 115, the photosensitive housing 21 is provided with a first rotating shaft 214, and the first rotating shaft 214 is rotatably mounted in the first shaft hole 115. When the developing unit 1 and the photosensitive unit 2 are assembled, the developing roller 111 is in contact with the photosensitive drum 211 as a contact type developing method; as the skip development method, the developing roller 111 and the photosensitive drum 211 are in a close proximity state, that is, the present invention is not limited to contact development or skip development. Of course, the first shaft 214 may be provided on the developing housing 11 and the first shaft hole 115 may be provided on the photosensitive housing 21, as long as the rotational connection between the developing unit 1 and the photosensitive unit 2 can be achieved. The present embodiment and the following embodiments describe the structure of the developing unit 1 in detail by taking the first shaft hole 115 as an example provided in the developing housing 11, and also describe a contact development method as an example below.

As shown in fig. 6 to 11, the urging assembly 13 is specifically disposed on one side of the first rotating shaft 214 facing away from the developing roller 111, that is, the urging assembly 13 is located on the other side of the developing roller 111 relative to the first rotating shaft 214, and the developing roller 111 and the photosensitive drum 21 are caused to approach or abut against each other by the rotational urging of the urging assembly 13. The urging assembly 13 specifically includes: an abutting portion 132 and a rotating portion; the abutting portion 132 is rotatably connected to the developing housing 11, and the abutting portion 132 also abuts against the photosensitive housing 21. When the abutting portion 132 rotates in the direction B toward the developing housing 11, that is, clockwise, relative to the developing housing 11 by an external force, the pressing portion 131 is pressed and stores a certain potential energy; when the external force is removed, under the potential energy action of the pressing portion 131, the pressing portion 131 drives the abutting portion 132 to rotate counterclockwise relative to the developing housing 11 in the direction a away from the developing housing 11, the abutting portion 132 lifts the photosensitive housing 21 upward while rotating counterclockwise, the photosensitive housing 21 rotates relative to the developing housing 11 along the first rotating shaft 214, meanwhile, the photosensitive drum 211 on the side of the first rotating shaft 214 away from the abutting portion 132 presses the surface of the developing roller 111, and the photosensitive drum 211 is in close contact with the developing roller 111. Here, the abutting portion 132 may protrude out of the developing housing 11 in a direction away from the first rotation shaft 214 so as to apply an external force to the abutting portion 132.

A light incident port 100 is further provided between the urging member 13 and the developing casing 11, and the light L emitted from the exposure unit 31 reaches the photosensitive drum 211 through the light incident port 100. Specifically, the light L passes through the gap between the abutting portion 132 and the developing housing 11. In this embodiment, the light L passes through the gap between the urging member 13 and the developing housing 11, and it is not necessary to separately design a passage through which the light L reaches the photosensitive drum 211, so that the overall size of the developing unit is reduced, and the cost is reduced.

As shown in fig. 8, in order to reduce the influence of the urging force of the pressing portion 131 on the assembling process of the developing unit 1 and the photosensitive unit 2, the direction F of the acting force of the abutting portion 132 acting on the photosensitive housing 21 is perpendicular to the connecting line L between the acting point of the abutting portion 132 on the photosensitive housing 21 and the first rotating shaft 214, so that the acting force of the abutting portion 132 acting on the photosensitive housing 21 is only used for urging the photosensitive housing 21 to rotate relative to the developing unit 1, and does not influence the movement of the first rotating shaft 214 towards the first shaft hole 115, thereby reducing the difficulty in matching the first rotating shaft 214 with the first shaft hole 115, and reducing the difficulty in assembling the developing unit 1 with the photosensitive unit 2.

The urging assembly 13 may further include a rotating portion, the rotating portion is specifically connected to the developing housing 11 in a rotating manner, and the rotating portion may be fixedly connected to the abutting portion 132 or integrally disposed to rotate the abutting portion 132 together when the rotating portion rotates relative to the developing housing 11. The rotary portion may also extend upward and beyond the top end of the developing housing 11 to facilitate the user's application of force to the rotary portion; in this case, the rotating portion and the abutting portion 132 may have a certain angle therebetween.

The urging assembly 13 may be plural, and plural urging assemblies 13 may be provided independently of each other, and in this case, the pressing portion 131 is also plural. Take two pressurizing parts 131 as an example: the two pressing portions 131 are symmetrically disposed near both end portions of the developing casing 11, respectively; with the developing housing 11 having the driving end provided with the transmission gear 120, the one disposed opposite to the driving end is the non-driving end, and thus, one of the pressing portions 131 is disposed near the driving end of the developing housing 11, and the other pressing portion 131 is disposed near the non-driving end of the developing housing 11. Wherein, the urging force provided by the pressing portion 131 provided near the driving end of the developing housing 11 is greater than the urging force provided by the pressing portion 131 provided near the driving end of the developing housing 11, so as to overcome the influence of the radial force in the meshing process of the driving-end gear, and further ensure that the photosensitive drum 211 is in close contact with the developing roller 111.

Of course, the number of the pressing portions 131 is not limited thereto; for example: the number of the pressing portions 131 may be 3 or more, two of the pressing portions 131 may be disposed near both ends of the developing housing 11, and the remaining pressing portions 131 may be disposed between the two pressing portions 131.

Generally, in order to facilitate the customer to take and place the developing unit 1, the developing unit 1 is generally provided with a handle, and a portion of the handle for the user to hold is generally provided with one or more ribs to increase friction between the user's hand and the handle, so that the user can hold the developing unit more reliably.

In order to further simplify the structure of the developing unit 1, the structure of the developing casing 11, and the handle and the urging member 13 may be provided in combination. Specifically, the handle body 133 in the handle is a rotation portion in the urging assembly 13, and the support arm 1321 in the handle is the abutment portion 132 in the urging assembly 13. The two ends of the handle main body 133 are rotatably connected to the developing housing 11 through the second rotating shaft 1332, one side of the supporting arm 1321 is fixedly connected to the handle main body 133, and the other side of the supporting arm 1321 abuts against the photosensitive housing 21.

Wherein the handle body 133 has a driving end facing the transmission gear 120, and a non-driving end disposed opposite to the driving end; the driving end and the non-driving end are respectively provided with the pressing portion 131, and the pressing portion 131 provided at the driving end provides a larger urging force than the pressing portion 131 provided at the non-driving end.

In the present embodiment, the pressing portion 131 is embodied as an elastic member, such as a torsion spring 1311. Compared with the structure of the developing housing 11, the structure of the handle main body 133 is simpler, so the first arm 1311a of the torsion spring 1311 can be fixed on the handle main body 133, and the torsion spring rotating shaft 1331 for sleeving the torsion spring 1311 can be arranged on the handle main body 133, for example, the second rotating shaft 1332 can have the function of the torsion spring rotating shaft 1331, that is, the torsion spring 1311 can be sleeved on the second rotating shaft 1332, so as to simplify the structure of the handle main body 133. The second arm 1311b of the torsion spring 1311 abuts on the developing housing 11.

The handle main body 133 may be provided at both ends thereof with fixing posts 1333, respectively, the fixing posts 1333 being mainly used to fix the first arms 1311a of the torsion springs 1311. In order to improve the installation reliability of the torsion spring 1311, the fixing post 1333 may be provided with a groove, and the first arm 1311a of the torsion spring 1311 is clamped in the groove to limit the movement of the torsion spring 1311 in the direction away from the handle body 133, so as to avoid the forced pushing failure caused by the separation of the torsion spring 1311 from the handle body 133, and ensure the improvement of the reliability of the forced pushing assembly 13.

Or, a flange 1334 extending along the radial direction of the fixing column 1333 may be provided at one end of the fixing column 1333 away from the handle main body 133, the flange 1334 may specifically be a closed loop extending along the circumferential direction of the fixing column 1333, and the flange 1334 may also be a block structure arranged along the circumferential direction of the fixing column 1333 at intervals, at this time, the first arm 1311a of the torsion spring 1311 may be provided between the flange 1334 and the handle main body 133 to limit the movement of the torsion spring 1311 along the direction away from the handle main body 133, so as to avoid the forced pushing failure caused by the torsion spring 1311 disengaging from the handle main body 133, and at the same time, the strength of the fixing column 1333 may also be improved, and the reliability of the forced pushing assembly 13.

Fig. 12 is a first schematic view illustrating the first embodiment of the present invention showing the matching between the corresponding side cover and the first rotating shaft; fig. 13 is a second schematic view illustrating the matching between the corresponding side cover and the first rotating shaft according to the first embodiment; fig. 14 is a cross-sectional view at C-C of fig. 13.

As shown in fig. 12 to 14, the developing-side cover 11a is provided with a sliding groove 116 on a side facing the developing hopper 113, and the sliding groove 116 is mainly used for guiding the first rotating shaft 214 to move toward the first shaft hole 115. The chute 116 may be in a V shape, and the width of the chute 116 in the width direction of the developing cartridge is gradually reduced from top to bottom, so that the first rotation shaft 214 enters the first shaft hole 115 more smoothly. Here, the width of the groove in the width direction of the developing cartridge needs to be larger than the diameter of the first rotating shaft 214 so that the first rotating shaft 214 can smoothly slide in the sliding groove 116.

The surface of the development-side cover 11a forming the slide groove 116 is a slide groove surface 116a, the slide groove surface 116a is located above the first shaft hole 115, and the first rotating shaft 214 is telescopically mounted to the first shaft hole 115 along the slide groove surface 116 a. Specifically, the first rotating shaft 214 is connected to the photosensitive housing 21 through the compression spring 117; when the photosensitive unit 2 is assembled with the developing unit 1, the first rotating shaft 214 is located in the sliding groove 116, the first rotating shaft 214 compresses the compression spring 117 in a direction away from the developing-side cover 11a, and under the action of an external force, the first rotating shaft 214 moves along the sliding groove surface 116a and towards the first shaft hole 115 until the first rotating shaft 214 is aligned with the first shaft hole 115, and under the compression potential energy of the compression spring 117, the compression spring 117 pushes the first rotating shaft 214 into the first shaft hole 115 towards one end of the developing-side cover 11a, so that the first rotating shaft 214 is assembled.

As shown in fig. 10 to 11, in which a guide post 215 is further provided on the photosensitive housing 21, and a guide groove 118 is further provided on the developing-side cover 11a, the fitting of the guide post 215 and the guide groove 118 can also guide the mounting direction of the photosensitive unit 2 with respect to the developing unit 1, thereby facilitating the assembly of the photosensitive unit 2 and the developing unit 1.

In addition, the stroke of the abutting portion 132 under the urging action of the pressing portion 131 is greater than or equal to the distance H between the first rotating shaft 214 along the trailing end of the sliding groove surface 116a and the first shaft hole 115, so as to facilitate the detachment of the developing unit 1 and the photosensitive unit 2. Specifically, when the developing unit 1 and the photosensitive unit 2 are detached from each other, the first rotating shaft 214 is disengaged from the first shaft hole 115 by an external force, for example: the first shaft 214 is pulled out or ejected out of the first shaft hole 115 by an external force; under the action of the supporting arm 1321 on the photosensitive housing 21, at the same time, the urging stroke of the abutting portion 132 is greater than or equal to the distance H (as shown in fig. 14) from the tail end of the first rotating shaft 214 along the chute surface 116a to the first shaft hole 115, that is, the first rotating shaft 214 can automatically slide out of the chute surface from the tail end of the chute surface 116a, so that the difficulty in detaching the developing unit 1 and the photosensitive unit 2 can be greatly reduced.

Among these, it is understood that: the starting point of the urging stroke of the abutting portion 132 is the position of the abutting portion 132 with respect to the developing housing 11 when the first rotating shaft 214 is located in the first shaft hole 215; the urging stroke of the abutting portion 132 is terminated at a position of the abutting portion 132 with respect to the developing housing 11 when the first rotation shaft 214 moves to the slide groove surface 116a or slides up the slide groove surface 116 a. The forced pushing stroke can be specifically as follows: the portion of the abutting portion 132 in contact with the photosensitive housing 21 moves from the start point to the end point by the length of the movement locus.

The developing unit 1 provided by the embodiment is provided with the urging assembly 13 rotationally connected with the developing housing 11, and the abutting part 132 in the urging assembly 13 abuts against the photosensitive housing 21, so that in the process that the urging assembly 13 rotates relative to the developing housing 11, the pressurizing part 131 can urge the abutting part 132 to rotate relative to the developing housing 11, so that the developing unit 1 and the photosensitive unit 2 rotate relative to each other around the first rotating shaft 214 through the rotation of the abutting part 132 relative to the developing housing 11, the photosensitive drum 211 is pressed to the developing roller 111 and is in close contact with the developing roller 111, the developing roller 111 can be in good contact with the photosensitive drum 211, and good developing performance is ensured.

Meanwhile, the urging assembly 13 is rotatably arranged on the developing shell 11, and the urging assembly 13 has more space which is arranged outside the developing shell 11, so that the occupation of the space of the developing bin 113 in the developing shell 11 is greatly reduced, the space of the waste powder recovery bin 212 in the photosensitive shell 21 is not occupied, and the capacity loss of the developing bin 113 and the waste powder recovery bin 212 is greatly reduced.

Example two

Referring to fig. 15, the present embodiment provides a developing unit 1, and the developing unit 1 of the present embodiment is different from the first embodiment in that in the developing unit 1 of the present embodiment, the elastic member is a compression spring 1312, the compression spring 1312 is disposed below the supporting arm 1321, and the compression spring 1312 is specifically abutted between the lower surface of the supporting arm 1321 and the developing housing 11.

Of course, the elastic member may be an elastic projection extending downward from the bottom of the support arm 1321, the elastic projection also abutting against the developing housing 11. In the present embodiment, the developing unit 1 will be described by taking an elastic member as a pressing spring 1312 as an example.

The supporting arm 1321 is provided with a driving end facing the transmission gear and a non-driving end opposite to the driving end; the driving end and the non-driving end are respectively provided with the pressure spring 1312, and the urging force provided by the pressure spring 1312 arranged at the driving end is greater than the urging force provided by the pressure spring 1312 arranged at the non-driving end, so that the influence of radial force in the meshing process of the driving end gear is overcome, and the photosensitive drum 211 is further ensured to be in close contact with the developing roller 111.

When the handle main body 133 and the bearing are rotated clockwise relative to the developing housing 11 in a direction toward the developing housing 11 by an external force, the pressing spring 1312 is compressed and stores a certain elastic potential energy; when the external force is removed, under the action of the elastic potential energy of the pressure spring 1312, the pressure spring 1312 urges the support arm 1321 to rotate counterclockwise relative to the developing housing 11 in a direction away from the developing housing 11, the support arm 1321 lifts the photosensitive housing 21 upward while rotating counterclockwise, the photosensitive housing 21 rotates about the first rotating shaft 214 relative to the developing housing 11, and at the same time, the photosensitive drum 211 on the side of the first rotating shaft 214 away from the abutting portion 132 is pressed against the surface of the developing roller 111, and the photosensitive drum 211 is in close contact with the developing roller 111.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. The utility model provides a developing unit, detachably installs to the sensitization unit on, developing unit with be equipped with first pivot between the sensitization unit and pass through first pivot is rotationally connected, developing unit includes: a developing housing and a developing roller rotatably supported on the developing housing, the photosensitive unit including: the device comprises a photosensitive shell and a photosensitive drum which is rotatably supported on the photosensitive shell;

the developing device is characterized in that the developing shell is further provided with an urging assembly which is rotatably connected with the developing shell, the urging assembly comprises a pressing portion and an abutting portion, the abutting portion abuts against the photosensitive shell and urges the developing unit to rotate relative to the photosensitive unit around the first rotating shaft under urging of the pressing portion, so that the photosensitive drum and the developing roller are close to or abut against each other.

2. The developer unit of claim 1, wherein the urging assembly is located on the other side of the developer roller with respect to the first rotational axis.

3. The developing unit according to claim 1, wherein a direction of the urging force of the abutting portion on the photosensitive housing is perpendicular to a line connecting the abutting portion and the point of the photosensitive housing and the first rotation axis.

4. The developing unit according to claim 1, wherein a light incident port for making incident light incident on the photosensitive drum is further provided between the urging member and the developing casing.

5. The developer unit according to claim 1, wherein the urging member further comprises a rotating portion rotatably connected to the developer housing, and the abutting portion is fixedly connected to the rotating portion.

6. The developing unit according to claim 5, wherein the rotation portion is a handle main body which protrudes from the developing housing; the butt joint part is a supporting arm, one end of the supporting arm is fixedly connected with the handle main body, and the other end of the supporting arm is in butt joint with the photosensitive shell.

7. The developing unit according to claim 6, wherein the developing housing has a driving end provided with a transmission gear, and a non-driving end disposed opposite to the driving end; the driving end and the non-driving end are respectively provided with the pressurizing part, and the forcing force provided by the pressurizing part arranged at the driving end is larger than the forcing force provided by the pressurizing part arranged at the non-driving end.

8. The developing unit according to claim 6, wherein the pressing portion is an elastic member.

9. The developing unit according to claim 8, wherein the elastic member is a torsion spring, the torsion spring is rotatably connected to the developing housing through a torsion spring rotating shaft, a first arm of the torsion spring is fixedly connected to the handle body, and a second arm of the torsion spring abuts against the developing housing.

10. The developing unit according to claim 9, wherein fixing posts are provided at both ends of the handle main body, respectively, and the first arm of the torsion spring is fixedly provided on the fixing posts.

11. The developer unit according to claim 10, wherein an end of the fixing post facing away from the handle body is provided with a flange extending in an axial direction perpendicular to the fixing post to restrict the torsion spring from moving in a direction facing away from the handle body.

12. The developer unit according to claim 8, wherein the elastic member is a compression spring, one end of the compression spring abuts against the developer housing, and the other end of the compression spring abuts against the support arm.

13. The developing unit according to any one of claims 1 to 12, wherein the developing casing further comprises a developing-side cover, the developing-side cover being provided with a chute surface and a first shaft hole located on a lower side of the chute surface, and the photosensitive casing being provided with a first rotating shaft, the first rotating shaft being telescopically mounted to the first shaft hole along the chute surface.

14. The developing unit according to claim 13, wherein a stroke of the abutting portion by the urging action of the pressing portion is larger than or equal to a distance between the first rotation shaft along the trailing end of the chute surface and the first shaft hole.

15. A process cartridge characterized by comprising: the developing device comprises a developing unit and a photosensitive unit which can be disassembled and assembled with each other, wherein a first rotating shaft is arranged between the developing unit and the photosensitive unit and is rotatably connected through the first rotating shaft; the photosensitive unit includes: the device comprises a photosensitive shell and a photosensitive drum which is rotatably supported on the photosensitive shell; the developer unit according to any of claims 1 to 14.

16. An electronic imaging device, comprising: an image forming apparatus main body and a process cartridge including a developing unit and a photosensitive unit which are detachable from each other, the process cartridge being detachably mountable in the image forming apparatus main body, the developing unit being the developing unit according to any one of claims 1 to 14.