CN106647200B

CN106647200B - Developing cartridge

Info

Publication number: CN106647200B
Application number: CN201610961840.3A
Authority: CN
Inventors: 陈斌
Original assignee: Zhuhai Un Tern Imaging Products Co ltd
Current assignee: Zhuhai Un Tern Imaging Products Co ltd
Priority date: 2016-10-28
Filing date: 2016-10-28
Publication date: 2023-10-10
Anticipated expiration: 2036-10-28
Also published as: CN106647200A

Abstract

The invention relates to a developing box, which comprises a box body and a detection mechanism arranged on the side surface of the box body; the detection mechanism comprises: an active member having an arcuate convex surface formed around a rotation axis thereof; a driven member having an arcuate concave surface which mates with the arcuate convex surface; and a detection member configured to be interlocked with the driven member. Wherein one of the driving member and the driven member has a pin and the other of the driving member and the driven member has a slot; when the pin is clamped in the groove, the driving component drives the driven component to rotate; when the pin is disengaged from the groove, the arcuate convex surface engages with the arcuate concave surface to prevent rotation of the driven member. The driven member is driven by the driving member to rotate from the first position to the second position, and when the driven member rotates to the second position, the driven member does not rotate along with the driving member. The developing box has the advantages of low cost and capability of realizing stable and reliable detection.

Description

Developing cartridge

Technical Field

The present invention relates to a developing cartridge for an electrophotographic image forming apparatus.

Background

An electrophotographic image forming apparatus or an image forming device such as a laser printer generally uses a detachable developing cartridge (also referred to as a toner cartridge, or a developer cartridge) to which toner (also referred to as toner or developer) is supplied to develop an electrostatic latent image on a photosensitive member (also referred to as a photosensitive drum), and then transfers the toner on the photosensitive member to a medium such as paper to form a visible image. Wherein the developing cartridge can be independently mounted to the electrophotographic image forming apparatus, or assembled with a drum cartridge including a photosensitive drum to be mounted in an electrophotographic image forming apparatus. When a developing cartridge is mounted, an electrophotographic image forming apparatus generally detects the developing cartridge to determine information related to the developing cartridge, such as whether the developing cartridge is new, a toner capacity of the developing cartridge, and the like.

Chinese patent document CN100470394C discloses an image forming apparatus and a developing cartridge used therefor, in which a drive gear is mounted on the outside of a cartridge body, and a detection gear having a tooth-missing portion and a contact protrusion is engageable with the drive gear. When the drive gear is driven to rotate the detection gear engaged with the drive gear after a new developing cartridge is mounted to the image forming apparatus, the contact protrusion on the detection gear rotates and triggers the contacted member in the image forming apparatus, whereby the image forming apparatus detects that the developing cartridge is new; when the detection gear rotates to a position where it does not mesh with the drive gear, the contact protrusion on the detection gear also moves to a position where it does not contact with the contacted member. When the used developing cartridge is mounted again to the image forming apparatus, the detection gear will not rotate with the drive gear any more, and the contact protrusion on the detection gear will not trigger the contacted member of the image forming apparatus any more, whereby the image forming apparatus detects that the developing cartridge is not new.

Chinese patent document CN 1828446B also discloses an image forming apparatus and a developing cartridge used therein, which is substantially the same in structure as the developing cartridge in the above patent, except that the number of contact protrusions on the detection gear of the developing cartridge may be one or more, which may be in contact with a contacted member in the image forming apparatus, so that the image forming apparatus determines whether the mounted developing cartridge is new, and obtains information about the toner capacity (i.e., the maximum paper amount printed). For example, 1 detection protrusion corresponds to a "high capacity" developing cartridge, and 2 detection protrusions correspond to a "low capacity" developing cartridge.

The developing cartridges in the above patent documents each employ a detection gear having a tooth-missing portion and a contact protrusion to detect whether the developing cartridge is new and/or the toner capacity of the developing cartridge. However, such a detection gear is difficult to manufacture and requires high mounting accuracy, so that the cost of the developing cartridge including the detection gear is also high.

In order to realize the detection of the developing cartridge at low cost, chinese patent document CN 102331699B proposes another developing cartridge comprising: a case body; the gear train is arranged on the outer wall of the box body; the rotating piece is rotatably fixed on the outer wall and is provided with a clutch wheel and a coaxial cam, and the cam and the clutch wheel are arranged in a phase-shifting way; the clutch wheel has a small diameter portion in clearance fit with the tooth top of one gear in the gear train and a large diameter portion in interference fit with the tooth top of the gear, the large diameter part is provided with an elastic friction layer along the circumferential direction; a contact member movably provided on the outer wall and having a contact end and an actuation end for contacting the cam; a resilient member mounted between the cartridge body and the contact member urges the contact end into contact with the cam. The elastic friction layer is in interference fit with the tooth tops of the gears, and driving force of the gears is transmitted to the rotating piece through friction to enable the rotating piece to rotate. The cam of the rotating member pushes the contact member to move, the trigger end of the contact member triggers the contacted member of the electrophotographic image forming apparatus, the developing cartridge is new and the capacity information of the developing cartridge is transmitted to the electrophotographic image forming apparatus. When the small diameter portion of the clutch wheel is in clearance fit with the tooth tip of the gear, the rotating member is no longer in contact with the gear and stops rotating. When the used developing cartridge is mounted to the electrophotographic image forming apparatus, the rotating member is not in contact with the gear and is not rotated any more, the contact member no longer triggers the contacted member of the electrophotographic image forming apparatus, so that the developing cartridge is detected as not being new.

However, in the developing cartridge disclosed in CN 102331699B, when the developing cartridge detection is performed, the large diameter portions of the gear and the clutch pulley are driven by friction force, and the contact end of the contact member is forced to contact with the cam by the torsion force of the elastic member, and there is a defect that the driving between the gear, the rotating member and the contact member is unstable or it is difficult to achieve desired driving between these components due to unstable defects of torsion force and friction force, and therefore, there is a defect that it is difficult to perform stable and reliable detection of the developing cartridge.

Disclosure of Invention

In view of the shortcomings of the prior art, a main object of the present invention is to provide a developing cartridge which is low in cost and capable of achieving stable and reliable detection.

In order to achieve the above-mentioned main object, an aspect of the present invention provides a developing cartridge, comprises a box body and a detection mechanism arranged on the side surface of the box body; wherein, this detection mechanism includes:

an active member having an arcuate convex surface formed to surround a rotation axis of the active member;

a driven member having an arcuate concave surface mated with the arcuate convex surface;

a detection member including one or more detection portions and configured to be linked with the driven member;

wherein one of the driving member and the driven member has a pin and the other of the driving member and the driven member has a slot; when the pin is engaged in the time of the groove, the water in the groove, the driving component drives the driven member rotates; when the pin is separated from the groove, the arc convex surface is clamped with the arc concave surface so as to prevent the driven member from rotating;

the driven member is driven by the driving member to rotate from the first position to the second position, and when the driven member rotates to the second position, the driven member does not rotate along with the driving member.

The pin and the groove may be engaged only 1 time or a plurality of times (e.g., 3 times, 5 times) during the rotation of the driven member from the first position to the second position. That is, the driven member may be continuously rotated from the first position to the second position (when the pin and the groove are engaged 1 time), or intermittently rotated from the first position to the second position (when the pin and the groove are engaged a plurality of times).

When a new developing cartridge is mounted in the electrophotographic image forming apparatus, the driving member receives the driving force and drives the driven member to rotate from the first position to the second position, and since the detecting member is configured to be interlocked with the driven member, the rotation of the driven member will correspondingly drive the position of the detecting member to change, and the change in position of the detecting member will be sensed by the electrophotographic image forming apparatus (e.g., the detecting portion of the detecting member triggers the contacted member in the electrophotographic image forming apparatus), so that the electrophotographic image forming apparatus obtains information about the developing cartridge, e.g., the developing cartridge is new and/or the toner capacity of the developing cartridge is determined. When the used developing cartridge is again mounted in the electrophotographic image forming apparatus, since the driven member is located at the second position and is no longer rotated with the driving member, the position of the detecting member is not changed as well, so that the electrophotographic image forming apparatus judges that the developing cartridge is not new.

In the technical scheme, on one hand, the driving member drives the driven member to rotate through the clamping between the groove and the pin, so that stable transmission can be realized between the driving member and the driven member, and stable and reliable detection of the developing box is realized; on the other hand, since the gear transmission mechanism is not included between the driving member and the driven member, the costs of the detection mechanism and the developing cartridge can be effectively reduced.

As a specific embodiment of the invention, the pin is formed on the driving member, the slot is formed on the driven member, and the driving member and the driven member constitute an incomplete geneva mechanism.

Alternatively, the slot is formed on the driving member and the pin is formed on the driven member, the driving member and driven member constituting an incomplete reverse geneva mechanism.

Preferably, the extending track of the groove is formed in a curve shape so that the rotation speed of the driven member is more uniformly controllable. In contrast, when the driven member employs the linear groove, the rotation speed thereof is much greater than that when employing the curved groove, resulting in uneven rotation speed, difficulty in control, and large impact force during rotation.

As another embodiment of the present invention, the detecting member is fixedly provided on or integrally formed with the driven member, so that the detecting mechanism is simplified. In this embodiment, the sensing member will rotate in synchronism with the driven member.

In order to achieve the above-mentioned main object, another aspect of the present invention provides a developing cartridge including a cartridge body defining a toner containing portion and a stirring member rotatably disposed in the toner containing portion; wherein, this developing cartridge still includes:

the gear train is arranged on the side wall of the box body and comprises a detection gear assembly; wherein the detection gear assembly comprises a gear and a disc-shaped part coaxially arranged with the gear, the disc-shaped part is limited with an arc-shaped convex surface surrounding the rotation axis of the detection gear assembly;

a driven member having an arcuate concave surface formed to mate with the arcuate convex surface;

wherein one of the detection gear assembly and the driven member has a pin and the other of the detection gear assembly and the driven member has a slot; when the pin is engaged with the slot, the detection gear assembly drives the moving member to rotate; when the driven member is separated from the groove, the arc-shaped convex surface is clamped with the arc-shaped concave surface so as to prevent the driven member from rotating;

the driven member is driven by the detection gear assembly to rotate from the first position to the second position, and when the driven member rotates to the second position, the driven member does not rotate along with the detection gear assembly.

In the technical scheme, the detection gear assembly drives the driven member to rotate through the clamping between the groove and the pin, so that the stable and reliable detection of the developing box can be realized, and the cost of the detection mechanism and the developing box can be effectively reduced. And as such, the driven member may be continuously or intermittently rotated from the first position to the second position.

In one embodiment of the invention, the pin is formed on the detection gear assembly, the slot is formed on the driven member, and the detection gear assembly and the driven member constitute an incomplete geneva mechanism.

Alternatively, the slot is formed on the detection gear assembly and the pin is formed on the driven member, the detection gear assembly and the driven member constituting an incomplete reverse geneva mechanism.

More specifically, the pin is provided on the gear of the detection gear assembly or connected to the disk; the disk-shaped part is arranged on the gear or on the same rotating shaft with the gear. Wherein, the disk-shaped part can be formed into a whole with the gear or fixedly arranged on the gear by a connecting means.

More specifically, the extended track of the groove is formed in a curved shape so that the rotation speed of the driven member is more uniformly controlled.

In another embodiment of the present invention, the detecting member is fixedly provided on or integrally formed with the driven member, so that the structure of the developing cartridge is simplified.

In still another embodiment of the present invention, the detecting gear assembly is disposed on the rotating shaft of the stirring member, so as to drive the stirring member to rotate through the detecting gear assembly, thereby simplifying the gear train and the structure of the developing cartridge.

The present invention will be described in further detail with reference to the drawings and the detailed description, for the purpose of more clearly illustrating the objects, technical solutions and advantages of the present invention.

Drawings

Fig. 1 is a perspective view of a first embodiment of a developing cartridge of the present invention;

FIG. 2 is a cross-sectional view of the developer cartridge of FIG. 1;

FIG. 3 is a perspective view of the developer cartridge of FIG. 1 with the end cap removed;

FIG. 4 is a perspective view of an end cap of the developer cartridge of FIG. 1;

FIG. 5 is a perspective view of the detection mechanism in the developer cartridge of FIG. 2;

FIG. 6 is another perspective view of the detection mechanism in the developer cartridge of FIG. 2;

FIG. 7 is a schematic rear view of the detection mechanism of the developer cartridge of FIG. 2 in an initial state;

FIG. 8 is a front view schematically showing the detecting mechanism of the developing cartridge of FIG. 2 in an initial state;

FIG. 9 is a schematic rear view of the detection mechanism in the second embodiment of the developing cartridge of the present invention;

FIG. 10 is a second embodiment of the developing cartridge of the present invention in the example, the detection mechanism is a schematic front view;

fig. 11 is a comparative view of the rotation speeds of the driven members in the developing cartridges of the first embodiment and the second embodiment;

FIG. 12 is a schematic rear view of a detection mechanism in a third embodiment of the developing cartridge of the present invention;

FIG. 13 is a schematic front view of a detection mechanism in a third embodiment of the developing cartridge of the present invention;

FIG. 14 is a perspective view of a detecting mechanism in a fourth embodiment of the developing cartridge of the present invention;

FIG. 15 is another perspective view of the detecting mechanism in the fourth embodiment of the developing cartridge of the present invention;

fig. 16 is a side view of a detecting mechanism in a fourth embodiment of the developing cartridge of the present invention.

Detailed Description

First embodiment

FIG. 1 is a first embodiment of a developing cartridge of the present invention a perspective view of an embodiment; fig. 2 is a cross-sectional view of the developing cartridge shown in fig. 1, in which an internal structure of the developing cartridge is shown. As shown in fig. 1-2, the developing cartridge includes a cartridge body 1 defining a toner accommodating portion 10, a developing roller 11 rotatably disposed at a toner outlet of the cartridge body 1, a toner feeding roller 12 rotatably disposed in the cartridge body 1 adjacent to the developing roller 11 for feeding toner to the developing roller 11, a stirring member 13 formed of a stirring shaft and stirring blades rotatably disposed in the toner accommodating portion 10, and the developing roller 11, the toner feeding roller 12 and the stirring member 13 extending in a longitudinal direction of the developing cartridge and supported on two opposite side walls of the cartridge body 1. The toner in the toner containing section 10 adheres to the surface of the developing roller 21 by the stirring member 13 and the toner feeding roller 12, to develop the electrostatic latent image on the photosensitive drum.

Referring to fig. 1, the driving end side of the cartridge 1 is provided with an end cap 2, and a driving force receiving portion 31 protrudes outside the end cap 2 to receive driving force from the electrophotographic image forming apparatus. Further, the end cap 2 is formed with an arc window 21, and the first detection portion 521 and the second detection portion 522 (see fig. 3 in detail, only the first detection portion 521 is visible in fig. 1) of the detection member 5 can be exposed to the outside of the end cap 2 via the arc window 21, so as to be able to be detected by the electrophotographic image forming apparatus.

Fig. 3 is a perspective view of the developing cartridge shown in fig. 1 with the end cap 2 removed, and referring to fig. 3, the driving end side of the cartridge body 1 is provided with a gear train including a driving force receiving portion 31, a developing roller driving gear 32, a powder feeding roller driving gear 33, an intermediate gear 34, and a detection gear assembly 35. Wherein the developing roller driving gear 32 and the powder feeding roller driving gear 33 are respectively engaged with gears of the driving force receiving portion 31; the intermediate gear 34 is a two-stage gear, the outer tooth portion thereof meshes with the gear of the driving force receiving portion 31, internal tooth portion (not visible in the figure) and detection gear the gear 351 (see fig. 5) of the assembly 35 is engaged. The detection gear assembly 35 is disposed on the rotating shaft of the stirring member 13 to drive the stirring member 13 to rotate.

With continued reference to fig. 3, the driving end side of the case 1 is further provided with a driven member 4 and a detection member 5 formed as one body. The detecting member 5 includes a hollow rotation shaft 51, and first and second detecting portions 521 and 522 provided at free ends of the hollow rotation shaft 51, the first and second detecting portions 521 and 522 having different structures. The hollow rotary shaft 51 extends outward from the driven member 4 in the axial direction of the developing roller 11, and has a rotation axis substantially coincident with the driven member 4. Referring to fig. 4, the inner side of the end cap 2 is provided with a support shaft 22 substantially coaxial with the arc-shaped window 21, and a hollow rotation shaft 51 is rotatably sleeved on the support shaft 22. In other embodiments of the present invention, the driven member 4 and the detecting member 5 may be rotatably provided on the side wall of the case 1. In addition, in other embodiments of the present invention, the detecting member 5 may include only one detecting portion.

Fig. 5 and 6 are perspective views of the developing cartridge detecting mechanism in the first embodiment, which includes the detecting gear assembly 35, the driven member 4, and the detecting member 5; wherein:

the detection gear assembly 35 includes a gear 351, a disk 352, and a pin 354; the gear 351 and the disc 352 are coaxially arranged (i.e. the centers of rotation of the two substantially coincide), the outer edge of the disc 352 forming an arcuate convex surface 353 surrounding the rotational axis of the detection gear assembly 35, the pin 354 being arranged at the circumferential edge of the detection gear assembly 35. Thus, the detection gear assembly 35 has a structure of a dial in a geneva mechanism. It is readily understood that the number of pins 354 may be one or more.

The driven member 4 includes three curved grooves 41 and an arcuate concave surface 42 between two adjacent curved grooves 41, and the curved grooves 41 are configured to mate with the pins 354, and the arcuate concave surface 42 is configured to mate with the arcuate convex surface 353. Thereby, the driven member 4 has a sheave structure in a sheave mechanism, and is configured as an incomplete sheave. It is easy to understand that the number of curved grooves 41 may also be one (especially when the detecting member has only one detecting portion).

That is, the detection gear assembly 35 and the driven member 4 constitute an incomplete geneva mechanism, and the detection gear assembly 35 serves as a driving member to drive the driven member 4 to rotate. Specifically, when the pin 354 is engaged with the curved slot 41, the detection gear assembly 35 drives the driven member 4 to rotate; when the pin 354 is disengaged from the curved groove 41, the arcuate convex surface 353 engages with the arcuate concave surface 42 to prevent the driven member 4 from rotating. Driven by the detection gear assembly 35, the driven member 4 intermittently rotates from the first position to the second position, and when rotated to the second position, the driven member 4 will not rotate with the detection gear assembly 35.

Fig. 7 is a schematic view of the back surface (i.e., the surface facing the cartridge body) of the developing cartridge detecting mechanism in the initial state in the first embodiment; fig. 8 is a schematic view of the front face (i.e., the face facing the end cap) of the detection mechanism in an initial state. As shown in fig. 7 to 8, in the initial state (i.e., when the developing cartridge is new, at which time the driven member 4 is located at the first position), the pin 354 is just engaged in the curved groove 41 located at the most upstream side in the rotational direction of the driven member 4, so that the detection gear assembly 35 drives the driven member 4 to intermittently rotate from the first position; when the pin 354 is disengaged from the curved groove 41 located on the most downstream side in the rotational direction of the driven member 4, the driven member is rotated to a second position (not shown). Since the driven member 4 is configured as an incomplete sheave, it will no longer rotate with the detection gear assembly 35 when the driven member 4 rotates to the second position (but the driven member 4 may deflect by a small angle due to its own weight at the second position to reach the gravity balance position).

Since the detection member 5 is formed integrally with the driven member 4, the detection member 5 rotates in synchronization with the driven member 4. In this process, the positional change of the first detecting portion 521 and the second detecting portion 522 is detected by the electrophotographic image forming apparatus to obtain information about the developing cartridge. It will be readily appreciated that in other embodiments of the invention, the detection member may be movably disposed on the side wall or end cap of the cartridge independent of the driven member, and is configured to be interlocked with the driven member to generate a position change under direct or indirect driving of the driven member, which can also realize detection of the developing cartridge.

Second embodiment

For simplicity, a description of the structure of the other portions of the developing cartridge will be omitted in the following embodiments, and only the developing cartridge detecting mechanism portion thereof will be described.

FIG. 9 is a schematic rear view of the detection mechanism in the second embodiment of the developing cartridge of the present invention; fig. 10 is a schematic front view of the detection mechanism. Wherein the driven member 14 is in a first position (initial state), and shows the contacted member 100 in the electrophotographic image forming apparatus.

As shown in fig. 9-10, the detection mechanism includes a driving member 135, a driven member 14, and a detection member. The driving member 135 includes a gear 1351, a disk 1352, and a pin 1354; the gear 1351 and the disk 1352 are coaxially arranged, the outer edge of the disk 1352 forms an arcuate convex surface 1353 surrounding the axis of rotation of the active member 135; pins 1354 are provided at the circumferential edge of the active member 135. Thus, the driving member 135 has a structure of a dial in a geneva mechanism.

The driven member 14 includes three arcuate concave surfaces 142 and a radial linear groove 141 disposed between two adjacent arcuate concave surfaces 142, the radial linear groove 141 being configured to mate with the pin 1354, the arcuate concave surfaces 142 being configured to mate with the arcuate convex surfaces 1353. Thereby, the driven member 4 has a sheave structure in a sheave mechanism, and is configured as an incomplete sheave.

That is, the driving member 135 and the driven member 14 constitute an incomplete geneva gear, and the driven member 14 is intermittently rotated from the first position shown in fig. 9 to 10 to the second position by the driving member 135, and when rotated to the second position, the driven member 14 will not rotate with the driving member 135 any more.

In this embodiment, the detecting member is integrally formed as a single body with the driven member 14, and includes a hollow rotation shaft 151, and two detecting portions 152 provided at free ends of the hollow rotation shaft 151. During the rotation of the driven member 14 from the first position to the second position, the two detection portions 152 contact the contacted members 100 in the electrophotographic image forming apparatus, respectively, so that the electrophotographic image forming apparatus obtains information about the developing cartridge.

FIG. 11 shows a first embodiment and a second embodiment the rotation speed of the driven member in the developing cartridge of the example was compared. Where the a curve represents the rotation speed of the driven member in the developing cartridge of the first embodiment, and the B curve represents the rotation speed of the driven member in the developing cartridge of the second embodiment. As can be seen from fig. 11, the driven member with curved grooves has a lower, more uniform rotational speed than the driven member with straight grooves.

Third embodiment

FIG. 12 is a schematic rear view of a detection mechanism in a third embodiment of the developing cartridge of the present invention; fig. 13 is a schematic front view of the detection mechanism. Wherein the driven member 24 is in a first position (initial state), and the contacted member 100 in the electrophotographic image forming apparatus is shown.

As shown in fig. 12 to 13, the detection mechanism includes a gear 235 as a driving member, a driven member 24, and a detection member. Gear 235 includes a pin 2351 and a disk 2352 formed at one side edge thereof; the gear 235 and the disk portion 2352 are coaxially disposed, and an outer edge of the disk portion 2352 forms an arcuate convex surface 2353 surrounding the rotational axis of the gear 2355. Thus, the gear 235 has the structure of a dial in a geneva mechanism.

The driven member 24 includes a plurality of arcuate concave surfaces 242 and a plurality of curved grooves 241, and the arcuate concave surfaces 242 and the curved grooves 241 are alternately arranged in order. Curved groove 241 is configured to mate with pin 2351 and arcuate concave surface 242 is configured to mate with arcuate convex surface 2353. Thus, the driven member 24 has the structure of a sheave in a sheave mechanism and is configured as an incomplete sheave.

That is, the gear 235 and the driven member 24 constitute an incomplete geneva mechanism, and the driven member 24 is intermittently rotated from the first position to the second position by the drive of the gear 235, and when rotated to the second position, the driven member 24 will not rotate with the gear 235.

In this embodiment, the detecting member is formed integrally with the driven member 24 as well, and the detecting member includes a hollow rotation shaft 251, and two detecting portions 252 provided at the free end of the hollow rotation shaft 251. During the rotation of the driven member 24 from the first position to the second position, the two detection portions 252 respectively contact the contacted members 100 in the electrophotographic image forming apparatus, so that the electrophotographic image forming apparatus obtains information about the developing cartridge.

Fourth embodiment

Fig. 14 and 15 are perspective views of a detecting mechanism in the developing cartridge of the fourth embodiment; fig. 16 is a side view of the detection mechanism. Of these, only the driving member 335 and the driven member 334 are shown in fig. 14-16, and the detecting member is not shown for simplicity.

As shown in fig. 14-16, the drive member 335 includes a gear 3351, an annular disk 3352, and a guide slot 3354; the disk portion 3352 and the driving member 335 are coaxially disposed, and an outer edge of the disk portion 3352 forms an arcuate convex surface 3353 surrounding the rotational axis of the driving member 335.

The driven member 334 includes a plurality of pins 3341 and a plurality of arcuate concave surfaces 3342, and the arcuate concave surfaces 3342 and the pins 3341 are alternately arranged in order. Wherein the plurality of pins 3341 are disposed to be uniformly distributed only over a portion of the circumference of the driven member 334; meanwhile, the pin 3341 is configured to be engaged with the guide groove 3354, and the arcuate concave surface 3342 is configured to be engaged with the arcuate convex surface 3353. Thus, the driving member 335 and the driven member 334 form an incomplete reverse geneva gear, and the driven member 334 intermittently rotates from the first position to the second position under the driving of the driving member 335, and when rotated to the second position, the driven member 334 will not rotate with the driving member 335. It is readily understood that in other embodiments, the number of guide slots 3354 may be multiple.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various equivalent modifications may be made without departing from the scope of the invention, and it is intended to cover the invention as defined in the appended claims.

Claims

1. The developing box comprises a box body and a detection mechanism arranged on the side surface of the box body; wherein, detection mechanism include:

a driven member having an arcuate concave surface that mates with the arcuate convex surface;

a detection member including one or more detection portions and configured to be linked with the driven member; the detection member is fixedly arranged on the driven member or is formed into a whole with the driven member;

wherein one of the driving member and the driven member has a pin and the other of the driving member and the driven member has a slot, the driving member and the driven member constituting an incomplete or incomplete reverse geneva gear; when the pin is clamped in the groove, the driving component drives the driven component to rotate; when the pin is separated from the groove, the arc-shaped convex surface is engaged with the arc-shaped concave surface so as to prevent the driven member from rotating;

the driven member is driven by the driving member to rotate from a first position to a second position, and when the driven member rotates to the second position, the driven member does not rotate along with the driving member any more; when a new developing cartridge is mounted in the electrophotographic image forming apparatus, the driven member is rotated from the first position to the second position in the initial state.

2. The developing cartridge according to claim 1, wherein the pin is formed on the driving member, the groove is formed on the driven member, the driving member and the driven member constituting an incomplete geneva gear.

3. The developing cartridge according to claim 2, wherein, the extending track of the groove is formed in a curve shape.

4. A developing cartridge including a cartridge body defining a toner accommodating portion, and a stirring member rotatably disposed in the toner accommodating portion; wherein, the developing cartridge further includes:

the gear train is arranged on the side wall of the box body and comprises a detection gear assembly; wherein the detection gear assembly comprises a gear and a disc-shaped portion coaxially arranged with the gear, the disc-shaped portion defining an arcuate convex surface surrounding the rotational axis of the detection gear assembly;

wherein one of the detection gear assembly and the driven member has a pin, the other of the detection gear assembly and the driven member has a slot, the detection gear assembly and the driven member constituting an incomplete geneva mechanism or an incomplete reverse geneva mechanism; when the pin is clamped in the groove, the detection gear assembly drives the driven member to rotate; when the pin is separated from the groove, the arc-shaped convex surface is engaged with the arc-shaped concave surface so as to prevent the driven member from rotating;

the driven member is driven by the detection gear assembly to rotate from a first position to a second position, and when the driven member rotates to the second position, the driven member does not rotate along with the detection gear assembly any more; when a new developing cartridge is mounted in the electrophotographic image forming apparatus, the driven member is rotated from the first position to the second position in the initial state.

5. The developing cartridge according to claim 4, wherein the pin is formed on the detection gear assembly, the groove is formed on the driven member, and the detection gear assembly and the driven member constitute an incomplete geneva mechanism.

6. The developing cartridge according to claim 5, wherein the pin is provided on the gear; the disc-shaped part is arranged on the gear or on the same rotating shaft with the gear.

7. A developing cartridge according to claim 5, wherein the extending track of said groove is formed in a curved shape.

8. A developing cartridge according to claim 4, wherein said detecting gear assembly is provided on a rotation shaft of said stirring member.