CN221860834U - Developing box - Google Patents

Abstract

The utility model discloses a developing box, comprising: a housing; a developing roller; a coupling gear; a transmission lever movable in a first direction in response to rotation of the coupling gear; a toggle protrusion movable in response to movement of the drive rod; a transmission gear rotatable in response to rotation of the coupling gear, the transmission gear including a plurality of urging protrusions protruding toward the second side of the housing and arranged at intervals in a rotation direction of the transmission gear; the forced pushing protrusion comprises a first guide surface and a second guide surface, and the included angle between the second guide surface and the first direction is smaller than the included angle between the first guide surface and the first direction; the transmission gear is also provided with a positioning groove, one end of the transmission rod can be inserted into the positioning groove to be used for positioning the position of the transmission gear in the self rotation direction, and when one end of the transmission rod is inserted into the positioning groove, the poking protrusion is positioned at the position of a detection body of the poking imaging equipment.

Description

A developing box

Technical Field

The utility model relates to a detachable developing box which is installed in an imaging device. The imaging device is an electronic photographic imaging device.

Background Art

A developing box is known in the art, which is provided with a detected component, the detected component has a protrusion, and an imaging device is provided with a detection unit. Specifically, when the developing box is installed in the imaging device and the developing box subsequently receives a driving force from the imaging device, the detected component rotates, and the rotation of the detected component causes the protrusion to shift between a contact state in which the protrusion contacts the detection unit and a non-contact state in which the protrusion does not contact the detection unit. This displacement of the protrusion between the contact state and the non-contact state or the number of protrusions indicates the specification of the developing box.

Utility Model Content

The utility model further develops the prior art and provides a developing box. The toggle member of the developing box can also realize the function of toggle the detection body in the imaging device to move to indicate the specification of the developing box without rotating. The utility model is realized by the following technical solutions:

A developing box, comprising:

A housing having a first side and a second side opposite to each other in a first direction;

a developing roller supported by the housing and rotatable about a developing roller rotation axis extending in a first direction; a coupling gear located on the first side of the housing in the first direction and rotatable by receiving a driving force from outside the developing cartridge;

a transmission rod, at least a portion of which is located on the first side of the housing and is movable in a first direction in response to rotation of the coupling gear;

a toggle protrusion movably mounted on the second side of the housing in a first direction and capable of moving in response to movement of the transmission rod;

a transmission gear disposed on the first side of the housing in a first direction and capable of rotating in response to the rotation of the coupling gear, the transmission gear comprising a plurality of thrust protrusions protruding toward the second side of the housing and arranged at intervals in the rotation direction of the transmission gear;

The forced pushing protrusion includes a first guide surface and a second guide surface, and the first guide surface and the second guide surface can cause the transmission rod to move from the first side to the second side relative to the shell in response to the rotation of the transmission gear, and the angle between the second guide surface and the first direction is smaller than the angle between the first guide surface and the first direction; a positioning groove is also provided on the transmission gear, and one end of the transmission rod can be inserted into the positioning groove and can be used to locate the position of the transmission gear in its own rotation direction. When one end of the transmission rod is inserted into the positioning groove, the toggle protrusion is in a position where the detection body of the imaging device can be toggled.

Furthermore, the positioning groove is arranged on the forced pushing protrusion.

Furthermore, a pushing surface is provided at the bottom of the positioning groove, and one end of the transmission rod abuts against the pushing surface.

Further, the positioning groove is arranged adjacent to the second guide surface, and in the rotation direction of the transfer gear, the positioning groove is located on the upstream side of the second guide surface.

Furthermore, the developing box also includes an elastic member arranged between the shell and the transmission rod, and the elastic force generated by the elastic member can be applied to the transmission rod to keep one end of the transmission rod in the positioning groove.

Further, the positioning groove includes a first positioning groove and a second positioning groove adjacent to each other, and in the rotation direction of the transmission gear, the first positioning groove is located on the upstream side of the second positioning groove, and before the transmission gear is driven to rotate, one end of the transmission rod is located in the first positioning groove, and after the transmission gear stops rotating, one end of the transmission rod is located in the second positioning groove.

Furthermore, the developing box also includes a stirring frame and a stirring frame gear connected to one end of the stirring frame, and the stirring frame gear can rotate in response to the rotation of the coupling gear; the transmission gear includes a toothed portion and a toothless portion, and when the toothed portion of the transmission gear is engaged with the gear teeth of the stirring frame gear, the transmission gear can be driven to rotate; when the transmission gear rotates to the point where the toothless portion is opposite to the gear teeth of the stirring frame gear, the transmission gear is no longer driven to rotate.

Furthermore, when the transmission gear is driven to rotate, one end of the transmission rod is disengaged from the positioning groove; when the transmission gear is no longer driven to rotate, one end of the transmission rod is located in the positioning groove.

Furthermore, a driving protrusion is provided on the stirring frame gear, and a driven protrusion is provided on the transmission gear. Before the stirring frame gear is driven to rotate, the driving protrusion and the driven protrusion are arranged at an interval; after the stirring frame gear is driven to rotate, the driving protrusion contacts the driven protrusion and can drive the driven protrusion, so that the transmission gear can rotate from a position where the toothless portion is opposite to the gear teeth of the stirring frame gear to a position where the toothed portion is meshed with the gear teeth of the stirring frame gear.

Further, in a direction intersecting the first direction, the driven protrusion is disposed at a position farther from the rotation axis of the transmission gear than the urging protrusion.

Furthermore, the developing box further includes a protective cover disposed on the first side of the housing, and an exposing hole is disposed on the protective cover, and the exposing hole can expose at least a portion of the transmission gear.

After adopting the above technical solution, a new developer box detection component is provided, which adopts a toothed disc structure to transmit driving force, so that the transmission component can move in the first direction, the number of gears is reduced, and the developer box can be made thinner and smaller.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a schematic diagram of a developing box in the utility model;

FIG2 is a schematic diagram of a developing box at a certain angle in which the driving side protective cover of the present invention is decomposed from the developing box;

3 is a schematic diagram of the developing box from another angle in which the driving side protective cover of the present invention is decomposed from the developing box;

FIG4 is an exploded schematic diagram of the gear train in the present invention;

FIG5 is a schematic diagram of a gear train in the present utility model;

FIG6 is a schematic diagram of a position where the toggle member of the present invention is located without toggling the detection body of the imaging device;

7 is a schematic diagram of the position of the toggle member in the present invention where the toggle member is located to toggle the detection body of the imaging device;

8 is a schematic diagram of the matching relationship between the stirring frame gear and the transmission gear in the utility model;

FIG9 is a schematic diagram of a transmission gear in the present utility model;

10 is an exploded schematic diagram of the transmission component and the toggle member in the utility model;

11 is a schematic diagram of the forced pushing portion of the transmission component of the utility model abutting against the first abutting surface;

12 is a schematic diagram of the forced pushing portion of the transmission component of the utility model abutting against the second abutting surface;

13 is a schematic diagram of the forced pushing portion of the transmission component of the present invention abutting between the first forced pushing portion and the second forced pushing portion;

14 is a schematic diagram of the utility model when the forced pushing portion of the transmission component abuts against the guide surface of the second forced pushing portion;

15 is a schematic diagram of the forced pushing portion of the transmission component of the present invention when the forced pushing surface of the second forced pushing portion abuts against each other.

DETAILED DESCRIPTION

As shown in Figures 1-15, a developing box in the present invention is shown, which can be detachably installed in an imaging device with a detection body; wherein the developing box includes a shell 601, the shell 601 has a developer accommodating portion that can accommodate developer, and a developing roller, a powder feeding roller and a stirring frame rotatably supported on the shell 601; first, the partial structure of the left end of the developing box will be described, and a gear system that can drive the developing roller, the powder feeding roller and the stirring frame to rotate is provided at the left end of the developing box. Specifically, the gear system includes a coupling gear 604 that can receive the driving force of the imaging device to rotate, a connecting gear 606 that can rotate, and a connecting gear 607 that can rotate. The developing roller gear 605 at one end of the developing roller 671, the powder feeding roller gear 638 connected to one end of the powder feeding roller 672, and the stirring frame gear 606 connected to one end of the stirring frame 673, the coupling gear 604 can drive the developing roller gear 605 to rotate so that the developing roller gear 605 can drive the developing roller 671 to rotate coaxially, the coupling gear 604 can drive the powder feeding roller gear 638 to rotate so that the powder feeding roller gear 638 can drive the powder feeding roller 672 to rotate coaxially, and the developing box also includes an idler gear 637 connected between the coupling gear 604 and the stirring frame gear 606, and the stirring frame The gear 606 can receive the driving force from the coupling gear 604 and the transmission gear 614 meshing with the stirring frame gear 606 through the idler gear 637. That is, the transmission gear 614 can receive the driving force of the coupling gear 604 transmitted through the idler gear 637 and the stirring frame gear 606 and rotate; a driving side protective cover 619 covering at least a part of the above-mentioned gear system is also provided at the left end of the housing 601, and an exposure hole 619b for exposing at least a part of the transmission gear 614 is provided on the driving side protective cover 619, which can facilitate the operator to operate the transmission gear 614 without removing the driving side protective cover 619. 19, the transfer gear 614 is reset, thereby improving the reset efficiency; the transfer gear 614 is installed on the driving side cover 619 through the elastic buckle 619a arranged on the driving side cover 619; the developing box also includes an electrode 648 spanning the left and right ends of the shell 601, that is, at least a part of the electrode 648 is located on the left side (first side) and the right side (second side) of the shell 601, and the electrode 648 can receive power from the power supply component in the imaging device and be electrically connected to the developing roller 671 to provide power to the developing roller 671 and ensure the printing of the developing box.

The developer box also includes a transmission component 623 that spans the left and right ends of the shell 601 and can move in the left and right directions relative to the shell 601. That is, at least a part of the transmission component 623 is located on the left side of the shell 601, and at least a part is located on the right side of the shell 601. In the direction intersecting the left and right directions (the first direction), the electrode 648 is located between the developing roller 648 and the transmission component 623. Preferably, the transmission component 623 is a rod, that is, a transmission rod. The transmission component 623 is arranged outside the developer containing portion of the shell 601 to avoid In order to prevent the developer in the developer-free accommodating portion from interfering with the movement of the transmission component 623 and causing problems such as jamming, the left end of the transmission component 623 abuts against the transfer gear 614, and it can move rightward in the left-right direction in response to the rotation of the transfer gear 614. The transmission component 623 includes a main body part 623b extending in the left-right direction and a forced pushing part 623a located at the left end part of the main body part 623b, and the rotation axis of the main body part 623b and the transfer gear 614 are offset, and the forced pushing part 623a can abut against the transfer gear 614.

Furthermore, an elastic member 631 is provided between the shell 601 and the transmission component 623. The elastic member 631 can force the transmission component 623 to move from right to left, so as to reset the transmission component 623 to its initial position after moving from left to right. That is, after the transmission component 623 responds to the rotation of the transfer gear 614, the transmission component 623 can overcome the elastic force of the elastic member 631 and move from left to right. Preferably, one end of the elastic member 631 abuts against the shell 601, and the other end abuts against the transmission component 623.

Specifically, the transmission gear 614 includes a toothed portion 614a1 and a toothless portion 614a2 arranged in the circumferential direction thereof, the toothed portion 614a1 has a longer extension length in the circumferential direction of the transmission gear 614 than the toothless portion 614a2, and when the developing cartridge is used as a new cartridge, the toothless portion 614a2 and the toothed portion of the stirring rack gear 606 face each other; further, a driven portion 614b is arranged on the side of the transmission gear 614 facing the housing 601, and in the direction intersecting the left and right directions, the driven portion 614b is longer than the transmission gear 614 in the direction intersecting the left and right directions. The pushing portion (661, 662, 663, 664) of the gear 614 is arranged at a position further away from the rotation axis of the transmission gear 614 to avoid interference between the two. The driven portion 614b is constructed as a protrusion, that is, a driven protrusion. The driven portion 614b has an inclined surface inclined relative to the left and right directions and facing the downstream side of the transmission gear 614 in the rotation direction of the transmission gear 614. Correspondingly, the stirring frame gear 606 is provided with a driving portion 606a facing the right end of the developing box. The driving portion 606a is constructed as a protrusion, that is, a driving protrusion. The protrusion, when the developing box is a new box, the driving part 606a and the driven part 614b are not in contact and are arranged at a certain angle in the direction of rotation. After the stirring frame gear 606 receives the rotational driving force of the coupling gear 604 and starts to rotate, the driving part 606a on the stirring frame gear 606 will contact the driven part 614b of the transmission gear 614 after rotating a certain angle, so that the transmission gear 614 is driven to rotate in the counterclockwise direction (when viewed from left to right). Before the driving part 606a and the driven part 614b are out of contact, the stirring frame gear 606 is rotated. The teeth of the mixing frame gear 606 will mesh with the toothed portion 614a1 of the transfer gear 614. Even if the driving portion 606a and the driven portion 614b are subsequently out of contact, the transfer gear 614 can still be driven to rotate through the meshing of the toothed portion 614a1 with the teeth of the mixing frame gear 606. Therefore, it can be known that after the mixing frame gear 606 of the developing box is driven to rotate, it will not immediately drive the transfer gear 614 to rotate, but will drive the transfer gear 614 to start rotating after it rotates a certain angle (i.e. after a period of time). According to the description of the above structure, it can be known that the transmission gear 614 can be driven to rotate by the engagement of the toothed portion 614a1 with the toothed portion of the stirring frame gear 606, but after it rotates a certain angle, the toothed portion 614a1 will be disengaged from the stirring frame gear 606, and at this time, the toothless portion 614a2 and the stirring frame gear 606 face each other again, and the transmission gear 614 will not be able to be driven to rotate. That is to say, when the developing box is used as a new box, the transmission gear 614 remains engaged with the stirring frame gear 606 and can be driven to rotate by it until the toothed portion 614a1 of the transmission gear 614 is disengaged from the toothed portion of the stirring frame gear 606 and can no longer be driven to rotate.

Furthermore, the transmission gear 614 further includes a first forced pushing portion 661, a second forced pushing portion 662, a third forced pushing portion 663 and a fourth forced pushing portion 664 which are sequentially arranged along the rotation direction, wherein the first forced pushing portion 661 and the fourth forced pushing portion 664 are integrally arranged, the second forced pushing portion 662, the third forced pushing portion 663 and the fourth forced pushing portion 664 are spaced apart in the rotation direction of the transmission gear 614, and the first forced pushing portion 661, the second forced pushing portion 662, the third forced pushing portion 663 and the fourth forced pushing portion 664 are arranged in a radial direction relative to the driven portion 614b closer to the rotation axis of the transmission gear 614; specifically, a first abutting surface 661a and a second abutting surface 661b which are adjacent to each other in the rotation direction are arranged on the first forced pushing portion 661, and the first abutting surface 661a is disposed at a position adjacent to the rotation axis of the transmission gear 614. 14 is arranged on the downstream side of the second abutment surface 661b in the rotation direction, and the two have approximately the same height from the first surface of the transmission gear 614 in the left and right directions, and the first abutment surface 614a is arranged in the groove structure (first positioning groove) of the protruding free end of the first forced pushing portion 661; the second forced pushing portion 662 includes a guide surface 662a and a forced pushing surface 662b that are abutted against each other, and in the rotation direction of the transmission gear 614, the guide surface 662a is arranged on the downstream side of the transmission gear 614, and the guide surface 662a is constructed as an inclined surface inclined relative to the left and right directions and facing the downstream side in the rotation direction of the transmission gear 614, and the forced pushing surface 662b is a plane intersecting the left and right directions. The third forced pushing portion 663 and the fourth forced pushing portion 664 have structures similar to the second forced pushing portion 662 of the box, and they are not repeated here. As shown in Figure 11, when the developing box does not receive the external rotational driving force, the forced pushing portion 623a at the left end of the transmission component 623 abuts against the first abutting surface 614a to keep the transmission component 623 in a position where a toggle member 622 toggles the detection body of the imaging device, and because the forced pushing portion 623a abuts against the first abutting surface 614a located in the groove structure, the relative position relationship between the two can be maintained before the developing box is subjected to external force, thereby avoiding the problem of positioning deviation between the transfer gear 614 and the transmission component 623 when the developing box is not detected by the imaging device, resulting in detection failure or even inability to be detected. As shown in FIG12 , when the transmission gear 614 is driven to rotate in the counterclockwise direction, the forced pushing portion 623a of the transmission component 623 disengages from the first abutting surface 614a and goes beyond the groove structure to abut against the second abutting surface 661b. Since the first abutting surface 661a and the second abutting surface 661b are at approximately the same height in the left-right direction from the surface of the transmission gear 614 facing the housing 601, when the forced pushing portion 623a abuts against the second abutting surface 661b, the toggle member 622 of the transmission component 623 is still in the position of toggling the detection body of the imaging device. In other words, when the forced pushing portion 623a is in the process of successively abutting against the first abutting surface 661a and the second abutting surface 661b and being in between the two, the toggle member 622 of the transmission component 623 is in the position of toggling the detection body of the imaging device. Therefore, Even if the transmission gear 614 is driven to start rotating, the detection body of the imaging device is still in the moved position. Only after the transmission gear 614 rotates a certain angle until it is disengaged from the second abutment surface 661b, the elastic force of the elastic component 631 abutting against the transmission component 623 is released, and the elastic component 631 will push the transmission component 623 to move to the left. At this time, the driving member 622 of the transmission component 623 will be out of contact with the detection body of the imaging device, and the imaging device will receive and record the detection signal. That is to say, before the forced pushing portion 623a of the transmission component 623 is disengaged from the second abutment surface 661b, the detection body of the imaging device is in a moved state. Therefore, there will be a period of time from the rotation of the stirring frame gear 606 to the stop of the detection body of the imaging device. Therefore, the developing box in this embodiment has the function of delayed detection.

Next, as shown in FIG13 , after the forced pushing portion 623a of the transmission component 623 is separated from the second abutting surface 661b, the forced pushing portion 623a is moved to the left under the elastic force of the elastic member 631 and abuts between the first forced pushing portion 661 and the second forced pushing portion 662; as shown in FIG14 , with the further rotation of the transmission gear 614, the forced pushing portion 623a of the transmission component 623 overcomes the elastic force of the elastic member 631 and, under the guidance of the guide surface 662a of the second forced pushing portion 662, the transmission component 623 gradually moves to the right until it abuts against the forced pushing surface 662b of the second forced pushing portion 662. The toggle member 622 of the transmission component 623 will toggle the detection body of the imaging device again, and the imaging device will receive the detection signal. Furthermore, the transmission gear 614 continues to rotate. The forced pushing portion 623a of the transmission component 623 disengages from the forced pushing surface 662b and moves to the left again under the elastic force of the elastic member 631 to abut between the second forced pushing portion 662 and the third forced pushing portion 663. Subsequently, the abutting and matching process between the transmission component 623 and the third forced pushing portion 663 is similar to that in the above-mentioned embodiment and will not be repeated here. Furthermore, the angle between the plane where the guide surface 664a of the fourth forced pushing portion 664 is located and the left-right direction is smaller than the angle between the plane where the guide surfaces of the second forced pushing portion 662 and the third forced pushing portion 663 are located and the left-right direction. In other words, the angle between the plane where the guide surface 664a of the fourth forced pushing portion 664 is located and the surface of the transmission gear 614 facing the shell 601 is larger than the angle between the plane where the guide surfaces of the second forced pushing portion 662 and the third forced pushing portion 663 are located. The angle between the plane of the transmission gear 614 and the surface of the transmission gear 614 facing the shell 601 side, that is, the slope of the guide surface 664a of the fourth forced pushing portion 664 is steeper than the slopes of the guide surfaces of the second forced pushing portion 662 and the third forced pushing portion 663. This structure enables the transmission gear 614 to rotate until the guide surface 664a of the fourth forced pushing portion 664 abuts against the forced pushing portion 623a of the transmission component 623. When the rotation speed of the transmission gear 614 remains unchanged, the transmission component 623 will climb along the guide surface 664a of the fourth forced pushing portion 664 at a faster speed and finally break away from the contact with the guide surface 664a. Therefore, the time interval for the toggle member 622 of the transmission component 623 to toggle the detection object of the imaging device again will be shortened; as shown in Figure 15, then, the transmission component 62 3, the forced pushing portion 623a contacts with the forced pushing surface 664b of the fourth forced pushing portion 664. At this time, the tooth portion of the stirring frame gear 606 is disengaged from the toothed portion 614a1 of the transmission gear 614, and is opposite to the toothless portion 614a2 of the transmission gear 6146a, and the transmission gear 614 will stop rotating. It is worth mentioning that the forced pushing surface 664b of the fourth forced pushing portion 664 is also arranged in the groove structure, which is a positioning groove (second positioning groove), which can make the forced pushing portion 623a of the transmission component 623 abut against the second positioning groove after the detection of the developing box is completed, and the relative position relationship between the two can be maintained to position the position of the transmission component 623 in the left and right direction and the position of the transmission gear 614 in its own rotation direction, so as to avoid the two from being disengaged from each other.

Furthermore, the forced pushing portion 623a of the transmission component 623 is constructed to have an inclined surface 623a1. When the forced pushing portion 623a contacts the guide surfaces of the second forced pushing portion 662, the third forced pushing portion 663 and the fourth forced pushing portion 664, the inclined surface and the guide surfaces are opposite to each other and can contact each other, which will make the forced pushing portion 623a slide more smoothly and effectively prevent the problem of the two being stuck. Of course, the inclined surface can also be set on only one of them, and there is no limitation on this.

Further, a toggle member 622 (i.e., a toggle protrusion) is provided on the right side of the transmission member 623. That is, in the left-right direction, the transmission gear 614, the transmission member 623, and the toggle member 622 are arranged in sequence. The toggle member 622 is detachably connected to the right end of the transmission gear 614 through a snap structure, and can move in response to the movement of the transmission member 623. That is, when the second transmission member moves to the left, the toggle member 622 can move to the left, and when the transmission member 623 moves to the right, the toggle member 622 can move to the right. Therefore, the toggle member 622 can toggle the imaging device to the right. The detection body, and this assembly structure can also quickly install or disassemble the toggle member 622, thereby improving the efficiency of installation or disassembly. Of course, the two can also be assembled in a fitting manner such as interference fit, which is not limited. In addition, the transmission component 623 and the toggle member 622 can also be integrally formed, and only one set of molds is required for the production of the two, thereby reducing production costs. Moreover, the toggle portion 622b of the toggle member 622 is also constructed as an inclined surface, which is inclined relative to the left and right directions, so that the detection body of the imaging device can be toggled more smoothly, thereby avoiding the problem of jamming during toggling.

Beneficial Effects

After adopting the above technical solution, a new developer box detection component is provided, which adopts a toothed disc structure to transmit driving force, so that the transmission component can move in the first direction, the number of gears is reduced, and the developer box can be made thinner and smaller.

Claims (10)

1. A developing box, comprising: A housing having a first side and a second side opposite to each other in a first direction; a developing roller supported by the housing and rotatable about a developing roller rotation axis extending in a first direction; A coupling gear, located on the first side of the housing in a first direction and rotatable by receiving a driving force from outside the developing cartridge; a transmission rod, at least a portion of which is located on the first side of the housing and is movable in a first direction in response to rotation of the coupling gear; a toggle protrusion movably mounted on the second side of the housing in a first direction and capable of moving in response to movement of the transmission rod; a transmission gear disposed on the first side of the housing in a first direction and capable of rotating in response to the rotation of the coupling gear, the transmission gear comprising a plurality of thrust protrusions protruding toward the second side of the housing and arranged at intervals in the rotation direction of the transmission gear; It is characterized in that the forced pushing protrusion includes a first guide surface and a second guide surface, and the first guide surface and the second guide surface can prompt the transmission rod to move from the first side to the second side relative to the shell in response to the rotation of the transmission gear, and the angle between the second guide surface and the first direction is smaller than the angle between the first guide surface and the first direction; a positioning groove is also provided on the transmission gear, and one end of the transmission rod can be inserted into the positioning groove and can be used to locate the position of the transmission gear in its own rotation direction. When one end of the transmission rod is inserted into the positioning groove, the toggle protrusion is in a position where the detection body of the imaging device can be toggled. 2 . The developing box according to claim 1 , wherein the positioning groove is arranged on the pushing protrusion. 3 . The developing box according to claim 1 , wherein a pushing surface is provided at the bottom of the positioning groove, and an end of the transmission rod abuts against the pushing surface. 4. The developing box according to claim 1, characterized in that the positioning groove is arranged adjacent to the second guide surface, and in the rotation direction of the transfer gear, the positioning groove is located on the upstream side of the second guide surface. 5. The developing box according to claim 1 is characterized in that the developing box also includes an elastic member arranged between the shell and the transmission rod, and the elastic force generated by the elastic member can be applied to the transmission rod to keep one end of the transmission rod in the positioning groove. 6. The developing box according to claim 1 is characterized in that the positioning groove includes a first positioning groove and a second positioning groove adjacent to each other, in the rotation direction of the transfer gear, the first positioning groove is located on the upstream side of the second positioning groove, before the transfer gear is driven to rotate, one end of the transmission rod is located in the first positioning groove, and after the transfer gear stops rotating, one end of the transmission rod is located in the second positioning groove. 7. The developing box according to claim 1 is characterized in that the developing box also includes a stirring frame and a stirring frame gear connected to one end of the stirring frame, and the stirring frame gear can rotate in response to the rotation of the coupling gear; the transmission gear includes a toothed portion and a toothless portion, and when the toothed portion of the transmission gear is engaged with the gear teeth of the stirring frame gear, the transmission gear can be driven to rotate; when the transmission gear rotates to the point where the toothless portion is opposite to the gear teeth of the stirring frame gear, the transmission gear is no longer driven to rotate. 8. The developing box according to claim 7 is characterized in that a driving protrusion is provided on the stirring frame gear, and a driven protrusion is provided on the transmission gear, and before the stirring frame gear is driven to rotate, the driving protrusion and the driven protrusion are arranged at an interval; after the stirring frame gear is driven to rotate, the driving protrusion contacts the driven protrusion and can drive the driven protrusion, so that the transmission gear can rotate from a position where the toothless portion is opposite to the gear teeth of the stirring frame gear to a position where the toothed portion is meshed with the gear teeth of the stirring frame gear. 9 . The developing cartridge according to claim 8 , wherein the driven protrusion is disposed at a position farther from the rotation axis of the transmission gear than the urging protrusion in a direction intersecting the first direction. 10 . The developing cartridge according to claim 1 , further comprising a protective cover disposed on the first side of the housing, wherein the protective cover is provided with an exposing hole, and the exposing hole can expose at least a portion of the transmission gear.