CN218957026U - Counting assembly and developing cartridge - Google Patents

Abstract

The utility model provides a counting assembly and a developing box, wherein the counting assembly is used for being installed in the developing box, and the developing box is detachably installed in equipment with a counting deflector rod and a limiting part; the counting assembly comprises a counting piece and a reset force supply piece, wherein the reset force supply piece is interacted with the counting piece, the counting piece is used for interacting with the counting deflector rod to enable the counting deflector rod to be stirred from a first position to a second position, and the reset force supply piece is used for providing reset force for resetting the counting piece; the counter is movable from an initial position to a final position; before the counting starts, the counting piece is positioned at the initial position, and the counting deflector rod is stirred to the second position by the counting piece; after counting, the counting piece is positioned at the end position, the counting piece is abutted with the counting deflector rod, and the counting deflector rod is abutted with the limiting part; the utility model utilizes the existing components in the equipment to limit the counting parts after counting, realizes automatic reset when the developing box is taken out, and can lead the resetting operation of the counting parts to be simple.

Description

Counting assembly and developing cartridge

Technical Field

The present utility model relates to the field of electrophotographic image forming, and more particularly, to a developing cartridge detachably mountable to an electrophotographic image forming apparatus, and a counting assembly provided in the developing cartridge, the developing cartridge being capable of achieving automatic reset.

Background

The method is characterized in that a counting assembly is arranged in a developing box, and is one of technical means that the existing developing box can be detected by an electrophotographic image forming device (hereinafter referred to as 'device'), and the basic working principle is that on the premise that the developing box is mounted to the device, the counting assembly starts to rotate around a rotation axis of the developing box along with the fact that the developing box receives a driving force, in the process that a counting piece arranged in the counting assembly rotates, the counting piece interacts with a counting deflector rod arranged in the device, the device detects information such as the type and service life of the developing box through controlling parameters such as the touch times, touch duration and touch interval of the counting piece and the counting deflector rod, and after counting is finished, the counting piece stops rotating, and the developing box starts developing work.

When the developer cartridge is removed and refilled and reinstalled to the apparatus, the counter and the counter lever need to interact again before the developer cartridge begins the development operation again, which requires that the counter be reset before the developer cartridge is reinstalled, otherwise the apparatus will not be able to detect the developer cartridge and the developer cartridge will not work.

The existing developing cartridge needs to disassemble part of components to carry out resetting operation, and the resetting method is complex, so the utility model relates to a counting piece capable of realizing automatic resetting.

Disclosure of Invention

The utility model provides a counting assembly and a developing box, which can realize automatic reset of a counting piece. The specific technical scheme is as follows:

a counting assembly for being installed in a developing cartridge detachably mounted to the apparatus having the counting lever and the limiting part; the counting assembly comprises a counting piece and a reset force supply piece, wherein the reset force supply piece is interacted with the counting piece and is used for interacting with the counting deflector rod to enable the counting deflector rod to be stirred from a first position to a second position, and the reset force supply piece is used for providing reset force for resetting the counting piece to the counting piece; the counting member is movable from an initial position to a final position; before counting starts, the counting piece is positioned at an initial position, and the counting deflector rod is stirred to a second position by the counting piece; after counting, the counting piece is positioned at the end position, the counting piece is abutted with the counting deflector rod, and the counting deflector rod is abutted with the limiting part.

Before the counting starts, the counting piece is contacted with the counting deflector rod at a first combination position, after the counting is finished, the counting piece is abutted with the counting deflector rod at a second combination position, and in the front-back direction, the second combination position is positioned behind the first combination position.

In the up-down direction, the second combining position is located above the first combining position.

The counting piece comprises a first part, wherein the first part comprises a limiting bulge and a stirring bulge which are sequentially arranged in the circumferential direction, the limiting bulge is used for interacting with the counting deflector rod, and the stirring bulge is used for stirring the counting deflector rod to count; in the radial direction of the counting piece, the limiting protrusion protrudes farther than the poking protrusion.

The limiting protrusion comprises a main body and a hook part which are connected with each other, the hook part is in contact with the counting deflector rod at a first combination position before counting starts, the hook part is in butt joint with the counting deflector rod at a second combination position after counting ends, and the second combination position is positioned behind the first combination position in the front-back direction.

In the up-down direction, the second combining position is located above the first combining position.

The count dial lever has different first and second faces, the first face faces the rear of the developing cartridge when the developing cartridge is mounted from the rear to the front, the second face faces the front of the developing cartridge, the first face is located behind the second face in the front-rear direction, the count dial lever further has a third face located between the first face and the second face, the count piece is in contact with the first face or the third face in an initial position, and the count piece is in contact with the first face in a terminal position.

The length of the limiting protrusion in the radial direction is 12.8mm plus or minus 1mm.

The first part further comprises a delay protrusion arranged adjacent to the limit protrusion, the limit protrusion protrudes farther than the delay protrusion in the radial direction of the counting piece, the delay protrusion is used for keeping contact with the counting deflector rod in the range extending in the circumferential direction to realize delay, and the angle of the delay protrusion is 145 DEG + -15 deg.

The counting piece further comprises a second part, wherein the second part comprises a first column body, a driving force receiving part and a driving force interruption part, the driving force receiving part is arranged on the outer circumference of the first column body, the driving force interruption part is arranged on the outer circumference of the first column body and is used for receiving driving force to enable the counting piece to rotate, and the driving force interruption part is used for enabling the counting piece to stop rotating; when the developing box is taken out, the limiting protrusion is separated from and abutted to the counting deflector rod, and under the action of the reset force supply piece, the limiting protrusion rotates for an angle along the second direction, and the counting piece resets.

The counting piece further comprises a second column body positioned at the center of the first column body and a protruding block connected with the second column body, and the length of the protruding block is 11.4mm plus or minus 0.5mm in the tangential direction of the second column body.

The present utility model also provides a developing cartridge comprising a housing and a counting assembly as described above; the counting assembly is located at a longitudinal end of the housing.

Drawings

Fig. 1 is a perspective view of a developing cartridge according to the present utility model.

Fig. 2 is an exploded view of the parts of the developing cartridge according to the present utility model.

Fig. 3 is a perspective view of a driving member according to the present utility model.

Fig. 4A to 4D are schematic views of a counter according to the present utility model.

Fig. 5 is a perspective view of an end cap on the side of the counter member in the developing cartridge according to the present utility model.

Fig. 6A is a schematic view of a counter according to the present utility model in an initial position.

Fig. 6B is an enlarged schematic view of a portion M1 in fig. 6A.

Fig. 7A is a schematic view of a counter according to the present utility model in an end position.

Fig. 7B is an enlarged schematic view of the portion M2 in fig. 7B.

Detailed Description

For more accurate description, the present utility model defines the length direction of the developing cartridge 100 as the longitudinal/left-right/axial direction, the width direction as the lateral/front-rear direction, and the height direction as the vertical/up-down direction.

Fig. 1 is a perspective view of a developing cartridge according to the present utility model.

The developing cartridge 100 is detachably mounted in an apparatus provided with a count dial 90 (shown in fig. 6A) and a stopper, the count dial 90 being engageable with the stopper to be restricted, the count dial 90 being movable in a first direction W1 to allow the apparatus to detect the developing cartridge 100. As shown in fig. 1, the developing cartridge 100 includes a casing 10 that can accommodate developer, and a developing member 13 provided in the casing 10, the casing 10 including a first casing 11 and a second casing 12 that are coupled to each other, a space formed by the first casing 11 and the second casing 12 being available for accommodating developer; the developing member 13 extends in the left-right direction and is rotatable about a rotation axis L1 parallel to the left-right direction, the developer stored in the casing 10 is supplied outward by the developing member 13 as the developing member 13 rotates, and the developing member 13 is located in front of the developing cartridge 100 in the front-rear direction; the developing cartridge 100 further includes a power receiving member 14 at a longitudinal end of the casing 10 and a counting assembly 40, the power receiving member 14 rotating about a rotation axis L2 parallel to the rotation axis L1 for receiving a driving force from the apparatus to drive the developing member 13 and the counting assembly 40 to rotate; the rotation axis of the counting assembly 40 is L3, and it is possible to implement that the rotation axis L3 may be parallel to the rotation axis L1/L2 or perpendicular to the rotation axis L1/L2, and during the rotation of the counting assembly 40, the counting assembly 40 interacts with the counting dial 90, and after the counting is completed, at least a part of the counting assembly 40 stops rotating.

The counter assembly 40 may be located at the same longitudinal end of the housing 10 as the power receiving element 14 or may be located at both longitudinal ends of the housing 10, respectively. When both are located at the same longitudinal end of the housing 10, driving force is transmitted between the power receiving element 14 and the counter assembly 40 through the gear train; when located at the two longitudinal ends of the housing 10, respectively, the driving force of the power receiving element 14 can be transmitted to the counting assembly 40 through a shaft extending in the longitudinal direction. The following description will be given of an example in which both are located at the same longitudinal end of the housing 10, and the rotation axis L3 and the rotation axis L1/L2 are parallel; the following technical solution is still applicable in the case of setting the rotation axis L3 perpendicular to the rotation axis L1/L2 by means of a bevel gear or a force conversion mechanism.

The developing cartridge 100 further includes a handle 15 coupled to the casing 10, the handle 15 being usable for mounting and dismounting the developing cartridge 100, the handle 15 being located at the rear of the developing cartridge 100 in the front-rear direction.

Fig. 2 is an exploded view of the parts of the developing cartridge according to the present utility model.

As shown in fig. 2, the developing cartridge 100 further includes an end cap 21 disposed at the same side as the counting assembly 40, at least a portion of the counting assembly 40 may be exposed outward through the end cap 21, and the end cap 21 may also serve to block the counting assembly 40 from moving in a left-right direction away from the casing 10, to enhance stability of the counting assembly 40 and to improve accuracy of counting; the counter assembly 40 includes a counter 41 and a return force supply 42 that interacts with the counter 41, the at least a portion of the counter 41 being exposed outwardly through the end cap 21 for interaction with the counter lever 90 to perform a counting function; the restoring force supplying member 42 is used for providing a restoring force for restoring the counter member 41 to the counter member 41, specifically, a part of the restoring force supplying member 42 is combined with the counter member 41, and the other part is combined with the housing 10, so as to automatically restore the counter member 41 after counting is completed, further, the restoring force supplying member 42 may be an elastic member or a magnetic member, etc., for example, the elastic member may be a torsion spring or a compression spring, etc., and the magnetic member may be provided as a pair of the same or different magnetic properties on opposite sides, and the automatic restoring is realized by using repulsive force or attractive force. The developing cartridge 100 further includes a driving member 30 interacting with the counting assembly 40, the driving member 30 for transmitting a driving force received by the power receiving member 14 from the apparatus to the counting member 41 to rotate the counting member 41 about the rotation axis L3, and further, the driving member 30 may be provided in a gear structure, or a pulley structure, or a sprocket structure, or a friction member, etc., to transmit the driving force to the counting member 41.

The second housing 12/housing 10 has a first end surface 121 at a longitudinal end, and a hollow column 122 and a mounting column 123 extend from the first end surface 121 in a direction away from the second housing 12/housing 10 in a left-right direction, the hollow column 122 being for coupling with the driving member 30 to mount the driving member 30; the mounting post 123 includes one or more protrusions 1231 distributed on the outer circumference, and the mounting post 123 is configured to be coupled with the counter 41 to mount the counter 41, and the protrusions 1231 are configured to limit the movement of the counter 41 in the left-right direction.

FIG. 3 is a perspective view of a driver according to the present utility model; FIGS. 4A-4D are schematic views of a counter in accordance with the present utility model; fig. 5 is a perspective view of an end cap on the side of the counter member in the developing cartridge according to the present utility model.

As shown in fig. 3, the driving member 30 includes a driving force output portion 31 and a driving force input portion 32, the driving force output portion 31 having a smaller diameter than the driving force input portion 32 in the left-right direction, and the driving force output portion 31 being further from the housing 10 than the driving force input portion 32, the driving force input portion 32 being for receiving the driving force transmitted from the power receiving member 14, the driving force output portion 31 being for interacting with the counter member 41 and transmitting the driving force to the counter member 41; the driving member 30 is coupled with the hollow cylinder 122 of the housing 10 such that the driving member 30 is mounted.

When the developing cartridge 100 is mounted to the apparatus, the count dial 90 is moved from the first position to the second position by the counter 41 and is held, and at this time, the count dial 90 is not in contact with the stopper, specifically, depending on the structure of the apparatus, the count dial 90 may be moved from the first position to the second position, or from the light-shielding position to the non-light-shielding position, or from the non-light-shielding position to the light-shielding position; after the counting member 41 rotates, the counting lever 90 returns to the first position, and during counting, the counting lever 90 is again moved from the first position to the second position by the counting member 41, and after counting, the counting lever 90 is still kept at the second position, and at this time, the counting lever 90 abuts against the limiting part. The second position may refer to a position where the count dial lever is in contact with the limiting portion, or a position where the count dial lever is not in contact with the limiting portion, that is, as long as the second position is different from the first position.

As shown in fig. 4A to 4D, the counter 41 includes a first portion 410 and a second portion 414, and the first portion 410 and the second portion 414 may be integrally formed or may be separately formed, the first portion 410 being configured to interact with the counter lever 90, and the second portion 414 being configured to receive the driving force transmitted from the driving member 30. Further, the first portion 410 includes a limiting protrusion 411, a delay protrusion 412 and a toggle protrusion 413 sequentially arranged in a circumferential direction, the delay protrusion 412 is disposed adjacent to the limiting protrusion 411, and the delay protrusion 412 extends in the circumferential direction; the limiting projection 411 is configured to interact with the count-up lever 90 (as shown in fig. 6A), and further, the limiting projection 411 has a main body 4111 and a hook portion 4112 connected to each other, the hook portion 4112 being configured to push the count-up lever 90 to move from the first position to the second position so that the image forming apparatus detects the developing cartridge 100; the delay projection 412 may be held in contact with the count dial 90 within the range extending in the circumferential direction to achieve delay, and further, the angle θ of the delay projection 412 is 145°±15°; the toggle protrusion 413 is used to toggle the count toggle lever 90 during counting to complete counting. In the radial direction of the counting member 41, the limit projection 411 projects farther than the delay projection 412 and the toggle projection 413, and further, the length h1 of the limit projection 411 in the radial direction is 12.8mm±1mm, if h1 is too large, the limit projection 411 may abut against the counting lever 90 too tightly after the developing cartridge 100 is mounted, resulting in breakage of the limit projection 411 when the counting member 41 rotates, and if h1 is too small, the limit projection 411 may fail to push the counting lever 90 or the distance to push the counting lever 90 is insufficient, resulting in failure of the apparatus to detect the developing cartridge 100.

The second portion 414 includes a first cylinder 415, a driving force receiving portion 416 provided at an outer circumference of the first cylinder 415, and a driving force interrupting portion 417 provided at an outer circumference of the first cylinder 415, and the restricting protrusion 411, the delay protrusion 412, and the toggle protrusion 413 are connectable to the first cylinder 415, and are operable to receive driving force to rotate the counter 41 about the rotation axis L3 when the driving force receiving portion 416 is opposite to the driving force output portion 31 of the driver 30, i.e., the driving force receiving portion 416 and the driving force output portion 31 are coupled to each other; the driving force interruption portion 417 is provided adjacent to the driving force receiving portion 416, and when the driving force interruption portion 417 is opposed to the driving force output portion 31 of the driver 30, the counter 41 can no longer receive the driving force and stop rotating. When the driver 30 is provided in a gear structure, the driving force output portion 31 and the driving force input portion 32 are gears, and at the same time, the driving force receiving portion 416 of the counter 41 is also provided as teeth capable of meshing with the driving force output portion 31, and the driving force interrupting portion 417 is a tooth missing portion.

As further shown in fig. 4A and 4B, the counting member 41 further includes a second post 418 located at the center of the first post 415 and a tab 419 connected to the second post 418, further, the counting member 41 is mounted by the second post 418, the tab 419 extends along a tangential direction and an axial direction of the second post 418, and the limiting protrusion 411, the delay protrusion 412 and the toggle protrusion 413 may be connected to the second post 418; the tab 419 is used for combining with a part of the restoring force supply member 42 and can bear the acting force exerted by the restoring force supply member 42, further, when the restoring force supply member 42 is a torsion spring, the tab 419 has an acting surface 4191, a part of the restoring force supply member 42 is abutted against the acting surface 4191, when the restoring force supply member 42 is a magnetic member, the magnetic members can be arranged as a pair, one magnetic member is combined with the tab 419, the other magnetic member is combined with the housing 10, and the magnetism of the opposite sides of the two magnetic members is the same or different; further, the length h2 of the tab 419 is 11.4mm±0.5mm in the tangential direction of the second post 418, so that the force of the restoring force supplier 42 can be applied to the tab 419 more smoothly, if h2 is too small, the tab 419 may be protruded too short, the restoring force supplier 42 may not push the tab 419, or the force of the restoring force supplier 42 pushing the tab 419 may be too small, so that the counter 41 may not be rotated, and if h2 is too large, the tab 419 may interfere with the driving member 30, and thus the counter may not be counted.

On the basis of satisfying the predetermined function, the structure of the counter can also be modified as follows:

1. the counter member may be arranged to receive the driving force via a pulley arrangement, or a sprocket arrangement, or a friction member, etc.;

2. the counting member may be provided in a separate structure, for example, the driving force receiving portion and the driving force interrupting portion are first portions, the first cylinder and the limit projection, the delay projection, and the toggle projection are second portions, and the first portions and the second portions are formed separately.

As shown in fig. 5, the end cap 21 has a through hole 211, and the through hole 211 is used to expose at least a portion (first portion 410) of the counter 41 to the outside, so that the counter 41 can interact with the counter lever 90.

FIG. 6A is a schematic illustration of a counter according to the present utility model in an initial position; FIG. 6B is an enlarged schematic view of the portion M1 of FIG. 6A; FIG. 7A is a schematic view of a counter according to the present utility model in an end position; fig. 7B is an enlarged schematic view of the portion M2 in fig. 7B.

The counter 41 is movable from an initial position to a final position under the force of the driving force and the restoring force supply 42, as follows.

As shown in fig. 6A, 6B, 7A, and 7B, the counter dial 90 has a first surface 901 and a second surface 902, the limiting parts include a first limiting part 911 and a second limiting part 912, the first surface 901 is a surface that contacts the counter 41 to cause the counter dial 90 to be moved, and the second surface 902 is a surface that contacts the first limiting part 911; the first face 901 faces the rear of the developing cartridge 100 when the developing cartridge 100 is mounted from the rear to the front, the second face 902 faces the front of the developing cartridge 100, the first face 901 faces the rear of the developing cartridge 100 when the developing cartridge 100 is taken out from the front to the rear, the second face 902 faces the front of the developing cartridge 100, and the first face 901 is located behind the second face 902 in the front-rear direction.

Fig. 6A and 6B show a state in which the counter 41 is located at the initial position before the start of counting, and when the developing cartridge 100 is mounted from the rear to the front, the hook portion 4112 contacts the first face 901 of the count-up lever 90, and the hook portion 4112/the limit projection 411 pushes the count-up lever 90 to rotate in the first direction W1, so that the count-up lever 90 is moved from the first position to the second position, so that the apparatus detects that the developing cartridge 100 is mounted; after the developing cartridge 100 is mounted in place, the hook portion 4112 contacts the first face 901 of the count-up lever 90 at the first engaging position a, so that the count-up lever 90 is kept at the second position, and at this time, the count-up lever 90 is not in contact with the stopper portion, the counter 41/stopper protrusion 411 is positioned at the initial position, and the driving force receiving portion 416 of the counter 41 starts to engage with the driving force output portion 31 of the driving member 30. Alternatively, the hook portion 4112 may also contact the third surface 903 between the first surface 901 and the second surface 902 when the developing cartridge 100 is mounted from the rear to the front.

Fig. 7A and 7B show a state in which the counter member 42 is located at the end position after the counting is completed, the counter member 41 is rotated in the second direction W2 by the driving of the driving member 30 after the developing cartridge 100 is mounted, the counter lever 90 passes through the limit projection 411 and is always contacted with the delay projection 412 to perform the delay process, and the counter lever 90 returns to the first position after the counter lever 90 completely passes through the delay projection 412; the counting member 41 continuously rotates, the stirring protrusion 413 stirs the counting deflector 90 from the first position to the second position, so that the equipment detects the relevant information of the developing cartridge 100, and further, the number of the stirring protrusions 413 is required to be set according to the counting requirement; after the toggle protrusion 413 is disengaged from the count dial 90, the count dial 90 returns to the first position again, the driving force interruption portion 417 of the count member 41 is opposite to the driving force output portion 31 of the driving member 30, and the count member 41 is disengaged from the driving member 30, but under the action of the restoring force supply member 42, the count member 41 continues to rotate, and the count dial 90 is again in contact with the limit protrusion 411 and pushed by the limit protrusion 411 from the first position to the second position until the count dial 90 abuts against the first limit portion 911, at which time the counting is completed, specifically, the second face 902 of the count dial 90 abuts against the first limit portion 911, at which time the hook portion 4112 abuts against the first face 901 of the count dial 90 at the second coupling position B.

Since the counter lever 90 is abutted by the first limiting portion 911 and cannot rotate along the first direction W1 any more, and at the same time, the second coupling position B, at which the hook portion 4112 abuts against the counter lever 90, is located above the first coupling position a in the up-down direction, the counter 41/limiting protrusion 411 is caught/blocked by the counter lever 90, and the counter 41 has a tendency to continue to rotate along the second direction W2 under the action of the restoring force supply member 42, but since the limiting protrusion 411 is blocked by the counter lever 90, the counter 41 cannot rotate along the second direction W2 either; at this time, the count dial 90 is held at the second position abutting against the stopper portion/first stopper portion 911, and the counter 41/stopper protrusion 411 is positioned at the end position.

In summary, after counting, the counting member 41 will not rotate accidentally under the action of external force, and the counting lever 90 can be stably maintained at the second position abutting against the limiting portion/the first limiting portion 911, so as to avoid failure of detecting the developing cartridge 100 by the apparatus. It should be noted that, before the limit protrusion 411 pushes the count dial 90 to the maximum angle (the count dial 90 abuts against the first limit portion 911), the count piece 41 is disengaged from the driving tooth 30, so as to prevent the limit protrusion 411 from being broken.

In the front-rear direction, the second combining position B is located at the rear of the first combining position a, so that the limit protrusion 411 is not interfered by the count-up lever 90 when the developing cartridge 100 is taken out, the developing cartridge 100 can be smoothly taken out, and at the same time, the limit protrusion 411 is disengaged from the count-up lever 90, the limit protrusion 411 is not blocked by the count-up lever 90, the limit protrusion 411/the counter 41 rotates by an angle in the second direction W2 by the restoring force of the restoring force supply member 42, the driving force receiving portion 416 of the counter 41 starts to combine with the driving force output portion 31 of the driving member 30, and the counter 41 is located at the initial position, thereby achieving automatic resetting.

The utility model utilizes the limiting part in the equipment to limit the counting piece for counting the end, and can obtain the following beneficial effects:

1. the limiting part is an existing part in the equipment, and the counting part cannot interfere with the inner wall of the equipment in the process of installing the developing box to the equipment, so that the developing box can be smoothly installed;

2. when the counting is finished, the counting piece is clamped under the combined action of the counting deflector rod and the reset force supply piece, at the moment, the limiting protrusion is abutted with the first surface of the counting deflector rod facing the rear of the developing box, when the developing box is taken out backward, the counting deflector rod does not interfere with the limiting protrusion, the limiting protrusion moves backward and is separated from and abutted with the counting deflector rod, other parts of the developing box do not contact with the inner wall of the equipment to form interference, and therefore the developing box can be taken out smoothly;

3. the structure of the counter/counting assembly can be simplified by positioning the components already present in the device.

4. The automatic reset can be realized when the developing box is taken out, and the reset operation is carried out without disassembling parts, so that the reset operation of the counting piece is simple.

Claims (12)

1. A counting assembly for being installed in a developing cartridge detachably mounted to the apparatus having the counting lever and the limiting part; it is characterized in that the method comprises the steps of,

the counting assembly comprises a counting piece and a reset force supply piece, wherein the reset force supply piece is interacted with the counting piece and is used for interacting with the counting deflector rod to enable the counting deflector rod to be stirred from a first position to a second position, and the reset force supply piece is used for providing reset force for resetting the counting piece to the counting piece;

the counting member is movable from an initial position to a final position;

before counting starts, the counting piece is positioned at an initial position, and the counting deflector rod is stirred to a second position by the counting piece;

after counting, the counting piece is positioned at the end position, the counting piece is abutted with the counting deflector rod, and the counting deflector rod is abutted with the limiting part.

2. The counting assembly of claim 1, wherein the counting member contacts the counting lever at a first engagement position before counting starts, and contacts the counting lever at a second engagement position after counting ends, the second engagement position being located rearward of the first engagement position in the front-rear direction.

3. The counting assembly of claim 2, wherein the second engagement location is above the first engagement location in the up-down direction.

4. The counting assembly according to claim 1, wherein the counting member comprises a first portion including a limit protrusion for interacting with the counting lever and a toggle protrusion for toggling the counting lever for counting, which are sequentially arranged in a circumferential direction;

in the radial direction of the counting piece, the limiting protrusion protrudes farther than the poking protrusion.

5. The counting assembly of claim 4, wherein the limit projection includes a body and a hook portion connected to each other, the hook portion being in contact with the counting lever at a first engagement position before counting starts, the hook portion being in abutment with the counting lever at a second engagement position after counting ends, the second engagement position being located rearward of the first engagement position in the front-rear direction.

6. The counting assembly of claim 5, wherein the second engagement location is above the first engagement location in the up-down direction.

7. A counter assembly according to any one of claims 1 to 6 wherein the counter lever has first and second different faces, the first face facing rearward of the developer cartridge when the developer cartridge is mounted from rear to front, the second face facing forward of the developer cartridge, the first face being rearward of the second face in a front-to-rear direction, the counter lever further having a third face located between the first and second faces, the counter member contacting the first face or the third face in an initial position and the counter member contacting the first face in a final position.

8. The counting assembly of claim 4, wherein the limit projection has a length of 12.8mm ± 1mm in a radial direction.

9. The counting assembly of claim 4, wherein the first portion further includes a delay tab disposed adjacent to the limit tab, the limit tab projecting farther than the delay tab in a radial direction of the counting assembly, the delay tab being for maintaining contact with the counting dial over the circumferential extent to effect a delay, the delay tab having an angle of 145 ° ± 15 °.

10. The counting assembly of claim 4, wherein the counting member further comprises a second portion including a first cylinder, a driving force receiving portion provided at an outer circumference of the first cylinder for receiving driving force to rotate the counting member, and a driving force interrupting portion provided at an outer circumference of the first cylinder for stopping rotation of the counting member;

when the developing box is taken out, the limiting protrusion is separated from and abutted to the counting deflector rod, and under the action of the reset force supply piece, the limiting protrusion rotates for an angle along the second direction, and the counting piece resets.

11. The counting assembly of claim 10, further comprising a second post centered on the first post and a tab connected to the second post, the tab having a length of 11.4mm ± 0.5mm in a tangential direction of the second post.

12. The developing box is characterized in that,

the developing cartridge comprising a housing and a counting assembly according to any one of claims 1 to 11;

the counting assembly is located at a longitudinal end of the housing.

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