Processing box

Abstract

The present invention provides a processing box, comprising a drum frame, a developing frame, a photosensitive drum, a developing roller and a separation mechanism, wherein the photosensitive drum comprises a drum barrel and a first driving assembly installed at one axial end of the drum barrel, the developing roller comprises a roller body and a second driving assembly installed at one axial end of the roller body, the first driving assembly comprises a transmission gear and a driving head connected to each other, the second driving assembly comprises a driving gear, a movable member and an elastic member, the first end of the movable member is connected to the roller body, the second end of the movable member can be connected to the driving gear, the driving gear and the transmission gear are meshed with each other, the elastic member forces the movable member to approach the driving gear, the separation mechanism can rotate the developing frame from a contact position to a spacing position, and the separation mechanism makes the movable member move along the axial direction of the roller body according to the rotation of the developing frame from the contact position to the spacing position, so as to separate the movable member from the driving gear. The processing box has good working stability, simple structure, low production cost and high production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of printing consumables, and in particular to a processing box which can be detachably installed on an imaging device. Background Art

[0002] An electrophotographic imaging device generally has an image processing unit and a developing unit. The electrostatic latent image formed on the image processing unit is developed using a developer such as toner provided by the developing unit to form a visible image on a medium such as paper. Toner is a consumable item that needs to be continuously replenished in the electrophotographic imaging device. Generally, a processing box with a certain amount of toner that can be detachably mounted to the developing unit in the electrophotographic imaging device is used to provide toner to the developing unit.

[0003] See also Figure 1 and Figure 2 There is a conventional process cartridge 1 comprising a driving assembly, a developing roller 14, a stirring frame (not indicated), a powder feeding roller (not indicated) and a photosensitive drum 13. The driving assembly comprises a first driving assembly 11 and a second driving assembly 12. The first driving assembly 11 drives the photosensitive drum 13 to rotate, and the second driving assembly 12 drives the developing roller 14, the stirring frame and the powder feeding roller to rotate. The second driving assembly 12 comprises a clutch 121, a second driving head 122, a driving gear 123 and a spring 124. During the process of forming an image in the image forming device, the clutch 121 and the spring 124 connect the second driving head 122 with the driving gear 123, the first driving assembly 11 receives the driving force of the first transmission head in the image forming device, thereby driving the photosensitive drum 13 to rotate, and the second driving head 122 receives the driving force of the second transmission head in the image forming device, thereby driving the developing roller 14, the stirring frame and the powder feeding roller to rotate. When the processing box 1 is printing in the imaging device, in order to improve the printing quality, the photosensitive drum 13 needs to be cleaned in the printing interval. Since the photosensitive drum 13 and the developing roller 14 are always in contact during printing, they are separated during the cleaning process. When the processing box 1 is in the state of cleaning the photosensitive drum 13, the clutch 121 disengages the second drive head 122 from the drive gear 123, and the second transmission head in the imaging device continues to drive the second drive head 122 to rotate. Since the drive gear 123 is separated from the second drive head 122, the drive gear 123 stops rotating, and the developing roller 14, the stirring frame and the powder feeding roller all stop rotating. At this time, the first transmission head in the imaging device continues to drive the first drive assembly 11 to rotate, thereby driving the photosensitive drum 13 to rotate, and the residual powder on the photosensitive drum 13 is cleaned.

[0004] However, the second drive assembly 12 of the existing processing box 1 needs to drive the powder feeding roller and the stirring frame to rotate in addition to driving the developing roller 14. The entire gear transmission structure is complicated, resulting in high difficulty in assembling the processing box 1, high production cost and low production efficiency. Summary of the invention

[0005] In order to solve the above problems, the main purpose of the present invention is to provide a processing box with low production cost, high production efficiency and good working stability.

[0006] In order to achieve the above-mentioned main purpose, the present invention provides a processing box, which can be detachably installed on an imaging device. The processing box includes a drum frame, a developing frame, a photosensitive drum, a developing roller and a separation mechanism. The photosensitive drum is rotatably supported on the drum frame, and the developing roller is rotatably supported on the developing frame. The developing frame rotates between a contact position and a spacing position relative to the drum frame. The photosensitive drum includes a drum barrel and a first driving assembly installed at one axial end of the drum barrel. The developing roller includes a roller body and a second driving assembly installed at one axial end of the roller body. The first driving assembly and the second driving assembly are located on the same side of the processing box. In the contact position, the roller body contacts the drum barrel, and in the spacing position, the roller body contacts the drum barrel. The roller body is separated from the drum drum, the first driving assembly includes a transmission gear and a driving head connected to each other, the driving head is used to receive the rotational force of the imaging device, the second driving assembly includes a driving gear, a movable part and an elastic part, the first end of the movable part is connected to the roller body, the second end of the movable part can be connected to the driving gear, the driving gear and the transmission gear are meshed with each other, the elastic part forces the movable part to approach the driving gear, the separating mechanism can receive the force of the imaging device to rotate the developing frame from the contact position to the spacing position, and the separating mechanism separates the movable part from the driving gear by moving the movable part along the axial direction of the roller body according to the rotation of the developing frame from the contact position to the spacing position.

[0007] It can be seen from the above scheme that the first end of the movable part is connected to the roller body, the second end of the movable part can be connected to the driving gear, the driving gear and the transmission gear are meshed with each other, the elastic member forces the movable part to approach the driving gear, and the separation mechanism can receive the force of the imaging device to rotate the developing frame from the contact position to the spacing position. The separation mechanism separates the movable part and the driving gear by moving the movable part along the axial direction of the roller body according to the rotation of the developing frame from the contact position to the spacing position, so that the driving head drives the drum to rotate to clean its surface, and the working stability is good. In addition, the structure of the processing box is simple, which can effectively reduce production costs and improve production efficiency. At the same time, when the processing box is placed in the imaging device or taken out from the imaging device, the resistance is small, and the installation or removal operation is more convenient and labor-saving.

[0008] A further solution is that the separation mechanism includes a force-bearing part and a guiding part connected to the force-bearing part, the developing frame is provided with a limiting hole for the force-bearing part to pass through, the force-bearing part can receive the force of the imaging device, the guiding part is provided with a waist-shaped hole rotatably connected to the movable part, and a boss is provided on one side of the guiding part, and the part of the boss that conflicts with the movable part has an inclined surface.

[0009] A further solution is that the movable part includes a first column and a shaft shoulder portion which are connected to each other, the first column is arranged to pass through the waist-shaped hole and can be connected to the driving gear, and the boss abuts against the end surface of the shaft shoulder portion.

[0010] A further solution is that the separation mechanism includes a pushing member and a linkage member, the linkage member is rotatably sleeved on one end of the driving gear, a first protrusion is arranged on one side of the linkage member, the pushing member has a force-bearing part and a guiding part connected to the force-bearing part, the developing frame is provided with a limiting hole for the force-bearing part to pass through, the force-bearing part can receive the force of the imaging device, the guiding part is provided with a circular hole rotatably sleeved on the movable part, and a second protrusion is arranged on one side of the guiding part, the parts of the second protrusion that conflict with the first protrusion are both inclined surfaces, and the pushing member is used to move the movable part along the axial direction of the roller body.

[0011] A further solution is that the movable part includes a first column and a shoulder portion connected to each other, the first column is arranged to pass through the circular hole and can be connected to the driving gear, and the guide portion abuts against the end surface of the shoulder portion.

[0012] A further solution is that a plurality of protrusions are arranged on the end surface of the first column, and a plurality of grooves are opened at one end of the driving gear close to the first column, and the protrusions can be inserted into the grooves.

[0013] A further solution is that the movable part also includes a second column, which is connected to one end of the shaft shoulder away from the first column, and the second column has a major arc segment. A major arc hole is opened at one end of the roller body, and the major arc segment can be movably matched with the major arc hole along the axial direction of the roller body, and the cross-section of the major arc segment is a major arc surface.

[0014] A further solution is that the elastic member is a spring, which is sleeved on the second column and pressed between the shaft shoulder and the roller body.

[0015] A further solution is that the first cylinder, the shaft shoulder, the second cylinder and the roller are all coaxially arranged.

[0016] A further solution is that the processing box also includes an end cover, which is installed on one side of the developing frame, and the driving gear is rotatably supported on the end cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of an existing process box.

[0018] Figure 2 It is a partial exploded view of an existing process cartridge.

[0019] Figure 3 It is a structural diagram of the first embodiment of the processing box of the present invention.

[0020] Figure 4 It is a first partial structural diagram of the first embodiment of the processing box of the present invention.

[0021] Figure 5 It is a second partial structural diagram of the first embodiment of the processing box of the present invention.

[0022] Figure 6 It is a partial structural diagram of the developing frame in the first embodiment of the process cartridge of the present invention.

[0023] Figure 7 It is an exploded view of the cooperation between the second driving assembly and the separation mechanism in the first embodiment of the processing box of the present invention.

[0024] Figure 8 It is a structural diagram of the cooperation between the second driving assembly and the separation mechanism in the first embodiment of the processing box of the present invention.

[0025] Fig. 9 1 is a structural diagram of a pushing member in the first embodiment of a processing box of the present invention.

[0026] Fig.10 1 is a structural diagram of the movable parts in the first embodiment of the process box of the present invention.

[0027] Fig.11 It is a structural diagram of the cooperation between the second driving assembly and the separation mechanism in the second embodiment of the processing box of the present invention.

[0028] Fig.12 It is an exploded view of the cooperation between the second driving assembly and the separation mechanism in the second embodiment of the processing box of the present invention.

[0029] The present invention is further described below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0030] Processing box first embodiment:

[0031] See also Figure 3 and Figure 4 The processing box 2 is detachably installed in the imaging device. The processing box 2 includes a drum frame 21, a developing frame 22, a photosensitive drum, a developing roller, a separation mechanism and an end cover 27. The photosensitive drum is rotatably supported on the drum frame 21, and the developing roller is rotatably supported on the developing frame 22. The photosensitive drum includes a drum 23 and a first driving assembly installed at one axial end of the drum 23. The developing roller includes a roller body 24 and a second driving assembly installed at one axial end of the roller body 24. The first driving assembly and the second driving assembly are located on the same side of the processing box 2. The developing frame 22 rotates between a contact position and a spacing position relative to the drum frame 21. In the contact position, the roller body 24 is in contact with the drum 23, and in the spacing position, the roller body 24 is separated from the drum 23.

[0032] The first driving assembly includes a transfer gear 26 and a drive head 25 which are connected to each other. The drive head 25 is used to receive the rotational force of the imaging device, thereby driving the transfer gear 26 to rotate and driving the drum 23 to rotate.

[0033] See also Figures 5 to 10 The second driving assembly includes a driving gear 28, a movable member 32 and an elastic member 33, and the driving gear 28 is meshed with the transfer gear 26. The end cover 27 is installed on one side of the developing frame 22, and the driving gear 28 is rotatably supported on the end cover 27. Specifically, both axial ends of the driving gear 28 extend outward with cylinders 281 and 282, and the end cover 27 is provided with support holes for the two cylinders 281 and 282 to rotatably cooperate, so that the driving gear 28 is rotatably supported on the end cover 27. The cylinder 282 on one side of the driving gear 28 close to the movable member 32 has a truncated cone 283 protruding from the driving gear 28, and the diameter of the truncated cone 283 is smaller than the diameter of the cylinders 281 and 282. Three grooves 284 are provided on the end surface of the truncated cone 283 close to the movable member 32, and the three grooves 284 are evenly arranged around the axis of the driving gear 28.

[0034] See also Figure 7 and Fig.10 The movable member 32 includes a first column 321, a shoulder 322, and a second column 323 which are connected to each other in sequence. The diameter of the shoulder 322 is larger than the diameter of the first column 321 and the second column 323. Three protrusions 324 are arranged on the end surface of the first column 321. The three protrusions 324 are evenly arranged around the axis of the first column 321. The three protrusions 324 can be inserted into the three grooves 284 respectively. One end of the second column 323 away from the shoulder 322 is a major arc segment 325, and the cross section of the major arc segment 325 is a major arc surface. A major arc hole (not shown) is opened at one end of the roller body 24, and the major arc segment 325 can be matched with the major arc hole in an axially movable manner along the roller body 24. The elastic member 33 is a spring, which is sleeved on the second column 323 and pressed between the shoulder 322 and the roller body 24, thereby forcing the movable member 32 to approach the driving gear 28. The first column 321, the shoulder portion 322, the second column 323 and the roller body 24 are all coaxially arranged, and the driving gear 28 receives the rotational force by meshing with the transfer gear 26. When the three protrusions 324 are respectively inserted into the three grooves 284, the driving gear 28 drives the movable part 32 to rotate and drives the roller body 24 to rotate.

[0035] See also Figures 5 to 9 The separation mechanism is located between the driving gear 28 and the movable member 32, and the separation mechanism can receive the force of the imaging device to rotate the developing frame 22 from the contact position to the spacing position. The separation mechanism separates the movable member 32 from the driving gear 28 by causing the movable member 32 to move along the axial direction of the roller body 24 according to the rotation of the developing frame 22 from the contact position to the spacing position.

[0036] Specifically, the separation mechanism includes a pusher 31 and a linkage member 29. The body of the linkage member 29 is a circular ring structure, which is rotatably sleeved on the truncated table 283 of the driving gear 28, and a first protrusion 291 is raised on the end face of the circular ring structure close to the movable member 32. The pusher 31 has a force-bearing portion 311 and a guide portion 313 connected to the force-bearing portion 311, and the force-bearing portion 311 can receive the force of the imaging device. The body of the guide portion 313 is a ring structure, which is provided with a circular hole 312 that is rotatably sleeved on the first column 321 of the movable member 32, and a second protrusion 314 is raised on the end face of the ring structure close to the driving gear 28, and a side end face of the ring structure away from the driving gear 28 contacts the end face of the shoulder portion 322 of the movable member 32. The portions where the second protrusion 314 and the first protrusion 291 conflict with each other are both inclined surfaces 315 and 292 . The pushing member 31 is used to move the movable member 32 along the axial direction of the roller body 24 .

[0037] See also Figure 6 The side wall 221 of the developing frame 22 is provided with a limiting hole 2211 for the force-bearing portion 311 of the pushing member 31 to penetrate. When the force-bearing portion 311 receives the force of the imaging device, the developing frame 22 is driven to rotate from the contact position to the spacing position. As the developing frame 22 rotates from the contact position to the spacing position, the guide portion 313 of the pushing member 31 rotates. Since the second protrusion 314 on the guide portion 313 and the first protrusion 291 on the linkage member 29 are both inclined surfaces 315 and 292, the guide portion 313 moves away from the driving gear 28 as the guide portion 313 rotates, forcing the movable member 32 to move away from the driving gear 28, so that the movable member 32 and the driving gear 28 are separated.

[0038] When the processing box 2 is installed in the imaging device, the imaging device is in a normal printing state, and the developing frame 22 is in a contact position relative to the drum frame 21, and the roller body 24 of the developing roller is in contact with the drum barrel 23 of the photosensitive drum. At this time, the force-bearing portion 311 of the pushing member 31 does not receive the force of the imaging device, and the movable member 32 is connected and matched with the driving gear 28, thereby receiving the driving force from the transmission gear 26 to make the developing roller rotate and work. During the printing process of the processing box 2, the developing roller rotates, and the roller body 24 of the developing roller is in contact with the drum barrel 23 of the photosensitive drum, so that the toner is stably transferred from the roller body 24 of the developing roller to the drum barrel 23 of the photosensitive drum, thereby realizing a series of laser printing such as exposure, development, and transfer on the printing paper.

[0039] When the imaging device needs to clean the drum 23 of the photosensitive drum, the cleaning unit of the imaging device applies a force to the force-bearing portion 311 of the pusher 31 of the process cartridge 2. As the force-bearing portion 311 receives the force of the imaging device, the developing frame 22 is driven to rotate from the contact position to the spacing position, so that the roller body 24 of the developing roller is separated from the drum 23 of the photosensitive drum. At the same time, as the developing frame 22 rotates from the contact position to the spacing position, the guide portion 313 of the pusher 31 rotates. Since the second protrusion 314 on the guide portion 313 and the first protrusion 291 on the linkage member 29 are both inclined surfaces 315 and 292, the guide portion 313 moves away from the driving gear 28 as the guide portion 313 rotates, forcing the movable member 32 to also move away from the driving gear 28, so that the movable member 32 and the driving gear 28 are separated. At this time, the spring 33 is in a compressed state, and the driving head 25 still receives the rotational force of the imaging device, continues to drive the transmission gear 26 to rotate, and drives the drum 23 and the driving gear 28 to rotate, while the driving gear 28 is in an idling state. Due to the separation between the movable member 32 and the driving gear 28, the roller body 24 of the developing roller stops rotating, and the roller body 24 of the developing roller is separated from the drum 23 of the photosensitive drum, so that the driving head 25 drives the drum 23 to rotate and clean its surface.

[0040] After the drum barrel 23 of the photosensitive drum is cleaned, the pusher 31 and the linkage member 29 of the processing box 2 are reset, and at the same time, the spring 33 forces the movable member 32 to approach the driving gear 28 under the action of its restoring force, so that the movable member 32 and the driving gear 28 are connected and matched, and the roller body 24 of the developing roller continues to rotate, so as to supply powder to the drum barrel 23 of the photosensitive drum, and then the imaging device continues to print, effectively ensuring the transfer of carbon powder between the developing roller and the photosensitive drum, so that the processing box 2 can discharge powder more evenly and the printing quality is stable. In addition, the structure of the processing box 2 is simple, which can effectively reduce production costs and improve production efficiency. At the same time, when the processing box 2 is placed in the imaging device or taken out from the imaging device, the resistance is small, and the installation or removal operation is more convenient and labor-saving.

[0041] Processing box second embodiment:

[0042] As an explanation of the second embodiment of the process box of the present invention, only the differences from the first embodiment of the process box will be explained below.

[0043] See also Fig.11 and Fig.12The separation mechanism 34 of the processing box 2' includes a force-bearing portion 341 and a guide portion 342 connected to the force-bearing portion 341. The developing frame 22 is provided with a limiting hole 2211 for the force-bearing portion 341 to penetrate, and the force-bearing portion 341 can receive the force of the imaging device. The guide portion 342 is provided with a waist-shaped hole 343 that is rotatably sleeved with the first column 321 of the movable member 32, and a boss 344 is provided on the side of the guide portion 342 facing the movable member 32. The boss 344 abuts against the end surface of the shaft shoulder portion 322 of the movable member 32, and the part of the boss 344 that abuts against the shaft shoulder portion 322 has an inclined surface 345.

[0044] When the processing box 2' is installed in the imaging device, the imaging device is in a normal printing state, the developing frame 22 is in a contact position relative to the drum frame 21, and the roller body 24 of the developing roller is in contact with the drum barrel 23 of the photosensitive drum. At this time, the force-bearing portion 341 of the separation mechanism 34 does not receive the force of the imaging device, and the movable member 32 and the driving gear 28 are connected and matched, thereby receiving the driving force from the transmission gear 26 to make the developing roller rotate and work. During the printing process of the processing box 2', the developing roller rotates, and the roller body 24 of the developing roller is in contact with the drum barrel 23 of the photosensitive drum, so that the toner is stably transferred from the roller body 24 of the developing roller to the drum barrel 23 of the photosensitive drum, thereby realizing a series of laser printing such as exposure, development, and transfer on the printing paper.

[0045] When the imaging device needs to clean the drum 23 of the photosensitive drum, the cleaning unit of the imaging device applies a force to the force-bearing portion 341 of the separation mechanism 34 of the process cartridge 2'. As the force-bearing portion 341 receives the force of the imaging device, the developing frame 22 is driven to rotate from the contact position to the spacing position, so that the roller body 24 of the developing roller is separated from the drum 23 of the photosensitive drum. At the same time, as the developing frame 22 rotates from the contact position to the spacing position, the guide portion 342 of the separation mechanism 34 rotates. Since the portion where the boss 344 on the guide portion 342 abuts against the shoulder portion 322 on the movable member 32 is an inclined surface 345, and the guide portion 342 cooperates with the first column 321 through the waist-shaped hole 343, the movable member 32 is forced to move away from the driving gear 28 as the guide portion 342 rotates, so that the movable member 32 and the driving gear 28 are separated. At this time, the spring 33 is in a compressed state, and the driving head 25 still receives the rotational force of the imaging device, continues to drive the transmission gear 26 to rotate, and drives the drum 23 and the driving gear 28 to rotate, while the driving gear 28 is in an idling state. Due to the separation between the movable member 32 and the driving gear 28, the roller body 24 of the developing roller stops rotating, and the roller body 24 of the developing roller is separated from the drum 23 of the photosensitive drum, so that the driving head 25 drives the drum 23 to rotate and clean its surface.

[0046] When the drum 23 of the photosensitive drum is cleaned, the separation mechanism 34 of the processing box 2' is reset, and the spring 33 forces the movable part 32 to approach the driving gear 28 under the action of its restoring force, so that the movable part 32 and the driving gear 28 are connected and matched, and the roller body 24 of the developing roller continues to rotate, so as to supply powder to the drum 23 of the photosensitive drum, and then the imaging device continues to print, effectively ensuring the transfer of toner between the developing roller and the photosensitive drum, so that the processing box 2' discharges powder more evenly and the printing quality is stable. Moreover, the structure of the processing box 2' is simple, which can effectively reduce production costs and improve production efficiency. At the same time, when the processing box 2' is placed in the imaging device or taken out from the imaging device, the resistance is small, and the installation or removal operation is more convenient and labor-saving.

[0047] The above embodiments are only preferred examples of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made according to the structure, characteristics and principles of the patent application scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A process cartridge, wherein the process cartridge is detachably mounted to an imaging device, wherein the process cartridge comprises a drum frame, a developing frame, a photosensitive drum and a developing roller, wherein the photosensitive drum is rotatably supported on the drum frame, and the developing roller is rotatably supported on the developing frame, wherein: The developing frame rotates relative to the drum frame between a contact position and a spaced position; The photosensitive drum comprises a drum and a first driving assembly mounted on one axial end of the drum, the developing roller comprises a roller body and a second driving assembly mounted on one axial end of the roller body, the first driving assembly and the second driving assembly are located on the same side of the process cartridge; In the contact position, the roller body is in contact with the drum, and in the spacing position, the roller body is separated from the drum; The first driving assembly includes a transmission gear and a driving head connected to each other, and the driving head is used to receive the rotational force of the imaging device; The second driving assembly includes a driving gear, a movable member and an elastic member, wherein a first end of the movable member is connected to the roller body, a second end of the movable member can be connected to the driving gear, the driving gear and the transmission gear are meshed with each other, and the elastic member forces the movable member to approach the driving gear; The process cartridge further comprises a separation mechanism, which can receive a force from the imaging device to rotate the developing frame from the contact position to the spacing position; The separation mechanism separates the movable member from the driving gear by causing the movable member to move along the axial direction of the roller body according to the rotation of the developing frame from the contact position to the spacing position; The separation mechanism comprises a force-bearing portion and a guiding portion connected to the force-bearing portion, the developing frame is provided with a limiting hole for the force-bearing portion to penetrate, and the force-bearing portion can receive the force of the imaging device; The guide part is provided with a waist-shaped hole which is rotatably sleeved with the movable part, and a boss is arranged on one side of the guide part, and a portion of the boss which contacts with the movable part has an inclined surface.

2. The process cartridge according to claim 1, wherein: The movable part comprises a first column and a shaft shoulder portion which are connected to each other. The first column is arranged to pass through the waist-shaped hole and can be connected to the driving gear. The boss abuts against the end surface of the shaft shoulder portion.

3. The process cartridge according to claim 2, wherein: A plurality of protrusions are arranged on the end surface of the first column, and a plurality of grooves are formed at one end of the driving gear close to the first column, into which the protrusions can be inserted.

4. The process cartridge according to claim 2, wherein: The movable part also includes a second column, which is connected to one end of the shoulder portion away from the first column, and the second column has a major arc segment. A major arc hole is opened at one end of the roller body, and the major arc segment can be movably matched with the major arc hole along the axial direction of the roller body, and the cross-section of the major arc segment is a major arc surface.

5. The process cartridge according to claim 4, wherein: The elastic member is a spring, which is sleeved on the second column and pressed between the shaft shoulder and the roller body.

6. The process cartridge according to claim 5, wherein: The first column, the shoulder portion, the second column and the roller body are all coaxially arranged.

7. The process cartridge according to any one of claims 1 to 6, characterized in that: The process cartridge further includes an end cover mounted on one side of the developing frame, and the driving gear is rotatably supported on the end cover.

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