CN215340703U

CN215340703U - Developing box

Info

Publication number: CN215340703U
Application number: CN202121455183.8U
Authority: CN
Inventors: 罗琴; 刘源
Original assignee: Ninestar Corp
Current assignee: Ninestar Corp
Priority date: 2020-09-18
Filing date: 2021-06-29
Publication date: 2021-12-28
Anticipated expiration: 2031-06-29

Abstract

The utility model discloses a developing box, which is detachably arranged in an imaging device along a first direction, the imaging device comprises a door cover, a chip contact is arranged on the door cover, and the developing box comprises: a chip; the mounting groove is provided with a first limiting part and a second limiting part, and a first opening is formed on the outer wall surface of the developing box; a conductive connector mountable in the mounting groove along a second direction, the conductive connector including a first contact portion, a first restricted portion, and a second restricted portion, wherein: a first contact surface is formed on one side, exposed to the first opening, of the first contact part, and the chip contact head abuts against the first contact surface to achieve electric connection. Compared with the prior art, the utility model avoids the technical problem of poor contact between the conductive connecting piece and the chip contact caused by vibration of the developing box or the imaging equipment.

Description

Developing box

Technical Field

The utility model relates to the field of electrophotographic imaging equipment, in particular to a developing box.

Background

Electrophotographic image forming apparatuses, which form an image on a recording material using an electrophotographic image forming process and using a developer, are exemplified by electrophotographic copying machines, electrophotographic laser printers, and the like. Generally, an electrophotographic image forming apparatus has a detachable developing cartridge, and such a developing cartridge can be divided into two types, i.e., an integral cartridge and a separate cartridge. Wherein the separate body cartridge is provided separately from the drum assembly having the photosensitive drum, and is detachably mountable to the drum assembly. Such a developing cartridge (i.e., a split cartridge) generally includes: the developing box is in direct contact with a chip contact on the electronic photographic imaging device through a chip terminal to realize communication.

Referring to fig. 1, which is a schematic structural view of an electrophotographic image forming apparatus of the related art, in an image forming apparatus 1, a door 11 is provided with a chip contact 13, the chip contact 13 includes an end surface located at a distal end of the chip contact 13 and a circumferential outer surface, and inside the door 11, the chip contact 13 is electrically connected to a circuit board located inside the door 11 through a retractable spring. The chip contact head 13 has an initial position projecting outward with respect to the surface of the door cover 11 and a retracted position retracted from the initial position to the inside of the door cover 11 by a certain distance by contacting with the chip of the developing cartridge after closing the door cover, and in the retracted position, the spring in the door cover 11 is in good electrical contact with the circuit board, and the developing cartridge communicates with the electrophotographic image forming apparatus through the chip terminal. When the door 11 is opened, the chip contact 13 may automatically return from the retracted position to the initial position where the spring within the door 11 is electrically disconnected from the circuit board or has relatively poor contact.

Chinese patent CN207081960U discloses a developing cartridge, which is provided with a conductive connecting member connecting a chip terminal and a chip contact, the conductive connecting member is provided with a "U" shaped connecting port, and after a door cover of an imaging device is closed, the conductive connecting member clamps a circumferential outer surface of the chip contact through the "U" shaped connecting port, so that the chip contact is kept at a retracted position, so that a developing cartridge chip and the imaging device keep good communication.

In the conventional developing cartridge, the circumferential outer surface of the chip contact is clamped by the U-shaped connecting port, so that the chip contact is maintained at the retraction position, and in the actual operation of the imaging device, due to the vibration of the developing cartridge and the imaging device, the U-shaped connecting port and the circumferential outer surface of the chip contact are easy to loosen, and the chip contact is easy to move from the retraction position to the initial position, so that the poor or interrupted communication between the chip of the developing cartridge and the imaging device is caused.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a developing box with stable contact between a conductive connecting piece and a chip contact of an imaging device, which aims to solve the technical problems in the prior art.

The present invention provides a developing cartridge detachably mountable to an image forming apparatus including a door cover on which chip contacts are provided in a first direction, the developing cartridge comprising:

a chip;

a developing roller;

the mounting groove is provided with a first limiting part and a second limiting part, and a first opening is formed on the outer wall surface of the developing box;

a conductive connector mountable in the mounting groove along a second direction, the conductive connector including a first contact portion, a first restricted portion, and a second restricted portion, wherein:

a first contact surface is formed on one side, exposed to the first opening, of the first contact part, and the end surface of the chip contact abuts against the first contact surface in a closed state of the door cover so as to realize electric connection;

the first limiting part and the first limited part realize limiting fit so as to limit the movement of the conductive connecting piece in the first direction and in the direction deviating from the first direction;

the second limiting part and the second limited part realize limiting fit so as to limit the movement of the conductive connecting piece in the second direction.

In the developing cartridge according to the above aspect, it is preferable that the mounting groove is provided on a rear side of the developing cartridge in the first direction, and includes a first groove wall surface, a second groove wall surface, a third groove wall surface, and a fourth groove wall surface, the first groove wall surface and the second groove wall surface are provided to face each other in the first direction, the first groove wall surface is provided on a rear side of the second groove wall surface, and the third groove wall surface and the fourth groove wall surface are provided to face each other in an axial direction of the developing roller;

the conductive connecting piece comprises a substrate, the first contact part comprises a first sheet body connected with the substrate, the first sheet body extends along the second direction, and the first contact surface is formed on the first sheet body;

and under the state that the conductive connecting piece is arranged in the mounting groove, the first contact surface is arranged close to the first groove wall surface.

In the developing cartridge, it is preferable that the first restriction portion includes a first protrusion protruding from the third groove wall surface and/or the fourth groove wall surface, and a first nip gap is formed between a wall surface of the first protrusion facing away from the first direction and the first groove wall surface;

the first restrained portion includes a second tab connected to the substrate, the second tab extending in the second direction, the second tab being bent from the first tab and gripped by the first gripping gap to restrain movement of the conductive connector in and out of the first direction.

The developing cartridge as described above, wherein preferably, in a state where the conductive connecting member is mounted in the mounting groove, the substrate abuts against the first projection to restrict the movement of the conductive connecting member in the second direction.

A developing cartridge as described above, wherein preferably, said second restricted portion includes a third sheet body connected to said base sheet;

the second limiting part comprises a second bulge and a third bulge, the second bulge is arranged on the wall surface of the second groove, and the third bulge is arranged on the second bulge in a protruding mode to form an L-shaped structure;

and under the state that the conductive connecting piece is arranged in the mounting groove, the third sheet body is abutted against the third bulge so as to limit the movement of the conductive connecting piece in the second direction.

In the developing cartridge, it is preferable that a fourth protrusion is protruded from the third groove wall surface and/or the fourth groove wall surface, the fourth protrusion is located at a rear side of the second protrusion in the first direction, and a second clamping gap is formed between the second protrusion and the fourth protrusion;

when the conductive connecting piece is installed in the installation groove, the third sheet body is clamped in the second clamping gap so as to limit the movement of the conductive connecting piece in the first direction and in the direction deviating from the first direction.

Preferably, the mounting groove is provided with a second opening, the conductive connecting member is provided with a second contact portion, and the chip is electrically connected to the second contact portion through the second opening.

The developing cartridge as described above, preferably, the second contact portion includes an avoiding groove and an elastic cantilever, a first end of the elastic cantilever is elastically connected to a wall of the avoiding groove, and after the elastic cantilever receives a pressing force of the chip, a second end of the elastic cantilever moves toward a direction close to the substrate and abuts against the second protrusion.

In the developing cartridge, it is preferable that the chip contact is elastically connected to the door cover by an elastic member so that the chip contact can elastically expand and contract in a reciprocating manner in the first direction, and an end surface of the chip contact abuts against the first contact surface through the first opening to achieve electrical connection.

A developing cartridge as described above, wherein it is preferable that the developing cartridge further includes a driving end and a conductive end which are oppositely provided in an axial direction of the developing roller, and the conductive connecting member is close to the conductive end with respect to the driving end; the chip is located at a bottom of the developing cartridge in a state where the developing cartridge is mounted to the image forming apparatus.

Compared with the prior art, the utility model avoids poor contact between the conductive connecting piece and the chip contact head caused by vibration of the developing box or the imaging equipment by arranging the first contact surface which is contacted with the end part of the chip contact head of the imaging equipment in a state that the door cover is closed. Meanwhile, the first limiting part and the first limited part are matched with the second limited part in a limiting mode, so that the first contact surface of the conductive connecting piece faces to the rear of the developing box and the conductive connecting piece is prevented from moving in the first direction and the second direction, the conductive connecting piece is stable in contact with a chip contact of the imaging device, and the imaging device is simple in structure, low in manufacturing cost and convenient to detach and replace.

Drawings

Fig. 1 is a schematic view of a structure of an electrophotographic image forming apparatus of the related art;

fig. 2 is an overall structural view of a developing cartridge provided in an embodiment of the present invention;

fig. 3 is a partially exploded view of a developing cartridge according to an embodiment of the present invention;

fig. 4 is an enlarged view of a portion a in fig. 3.

Description of reference numerals: 10-developing cartridge, 10 a-first side, 10 b-second side, 10 c-third side, 10 d-fourth side, 10 e-fifth side, 10 f-sixth side, 20-chip, 30-mounting groove, 30 a-first groove wall surface, 30 b-second groove wall surface, 30 c-third groove wall surface, 30 d-fourth groove wall surface, 31-first opening, 32-second opening, 33-first protrusion, 34-second protrusion, 35-third protrusion, 36-fourth protrusion, 37-first clamping gap, 38-second clamping gap, 40-conductive connecting member, 41-first sheet body, 41 a-first contact surface, 42-second sheet body, 43-third sheet body, 44-substrate, 45-avoiding groove, 46-elastic cantilever, 50-chip protective cover, 60-developing roller;

p-a first direction;

l-a second direction;

in the prior art:

1-imaging device, 11-door cover, 13-chip contact.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the utility model.

To better explain the developing cartridge 10 and the image forming apparatus 1 in the present embodiment, reference is now made to the X, Y, Z-axis concept, taking three spatial axes orthogonal to each other as the X-axis, the Y-axis, and the Z-axis.

Referring to fig. 2 and 3, the developing cartridge 10 is substantially rectangular parallelepiped in shape, and has a first side 10a, a second side 10b, a third side 10c, a fourth side 10d, a fifth side 10e, and a sixth side 10f, the first side 10a being disposed opposite to the second side 10b, the third side 10c being disposed opposite to the fourth side 10d, and the fifth side 10e being disposed opposite to the sixth side 10 f.

The first side 10a is provided with a developing roller 60, the rotation axial direction of the developing roller 60 is defined as a Y-axis direction, the installation direction of the developing box 10 is an X-axis direction, and the thickness direction of the developing box 10 is a Z-axis direction; the plane formed by the X axis and the Y axis is an XY plane, and the plane formed by the Y axis and the Z axis is a YZ plane. The plane formed by the X axis and the Z axis is an XZ plane, preferably, the XY plane is positioned on a horizontal plane, and the Z axis is vertical.

The first side 10a and the second side 10b are disposed opposite to each other in the X-axis direction, the first side 10a is located on the + X-axis direction side, the second side 10b is located on the-X-axis direction side, and the + X-axis direction is the first direction P of the developing cartridge 10.

The third side 10c and the fourth side 10d are disposed opposite to each other along the Z-axis direction, the third side 10c is located at the + Z-axis direction side, the fourth side 10d is located at the-Z-axis direction side, and preferably, the second direction L of the conductive connection member 40 is the + Z-axis direction.

The fifth side 10e is disposed opposite to the sixth side 10f in the Y-axis direction, and the fifth side 10e is located on the + Y-axis direction side, and the sixth side 10f is located on the-Y-axis direction side, the Y-axis direction being parallel to the rotational axis direction of the developing roller.

In order to solve the technical problem that the contact state of the chip contact head 13 is unstable in the prior art, which easily causes poor or interrupted communication between the chip 20 of the developing cartridge 10 and the imaging device 1, the following solutions are proposed:

as shown in fig. 2 to 4, an embodiment of the present invention provides a developing cartridge 10, detachably mountable to an image forming apparatus 1 in a first direction P, the image forming apparatus 1 can refer to the schematic structural diagram of the prior art electrophotographic image forming apparatus 1 shown in fig. 1, and includes a main body portion for accommodating the developing cartridge 10, and a door 11, a retractable chip contact 13 is disposed on the door 11, the chip contact 13 is elastically and telescopically connected by an elastic member (such as a spring, etc.), the chip contact 13 includes two states, one is a natural extension state at the initial position, the chip contact 13 extends outwards, the other is a retraction state after being stressed, when the door cover 11 is closed, the chip contact 13 is compressed by force application, the chip contact 13 is in the retraction state, under the state, the spring in the door cover 11 makes good electrical contact with the circuit board, and the developing cartridge 10 communicates with the electrophotographic image forming apparatus 1 through the chip 20 terminals.

The developing cartridge 10 includes:

and a chip 20, wherein the chip 20 is arranged on the fourth side 10d of the developing box 10 and is close to the sixth side 10f relative to the fifth side 10 e. The developing cartridge 10 further includes a driving end (i.e., an end provided with a driving part receiving a driving force from an image forming apparatus) and a conductive end (i.e., an end provided with a part receiving power from an image forming apparatus) which are opposite to each other in an axial direction of the developing roller 60, and the conductive connecting member 40 is close to the conductive end opposite to the driving end to reduce vibration interference of the driving end; in a state where the developing cartridge 10 is mounted to the image forming apparatus, the chip 20 is located at the bottom of the developing cartridge 10.

The mounting groove 30 is used for mounting and fixing the conductive connecting member 40, and is provided with a first limiting portion and a second limiting portion, a first opening 31 and a second opening 32 are formed on the outer wall surface of the developing cartridge 10, the mounting groove 30 is arranged on one side of the developing cartridge 10 departing from the first direction P, the first opening 31 and the second opening 32 are located on the outer wall surface of different sides, preferably, the first opening 31 is located on one side of the developing cartridge 10 facing the door cover 11, and the second opening 32 is located on the top side or the bottom side of the developing cartridge 10.

A conductive connection member 40 for electrically connecting the chip 20 and the chip contact 13, the conductive connection member 40 being mountable in the mounting groove 30 along a second direction L, the conductive connection member 40 being made of a metal material and including a first contact portion, a second contact portion, a first restricted portion and a second restricted portion, wherein:

the first contact portion is arranged close to the first opening 31, a first contact surface 41a is formed on one side of the first contact portion exposed to the first opening 31, the chip contact head 13 is abutted to the first contact surface 41a through the first opening 31 in a closed state of the door cover 11, the chip contact head 13 is compressed to a retraction position from an initial position, communication is achieved between the chip 20 and the imaging device 1, and due to the fact that the first contact surface 41a is in surface contact with the tail end of the chip contact head 13, poor contact between the conductive connecting piece 40 and the chip contact head 13 caused by vibration of the developing box 10 or the imaging device 1 is avoided.

The chip 20 is electrically connected to the second contact via the second opening 32.

In a state that the conductive connecting piece 40 is mounted to the mounting groove 30, the first limiting portion and the first limited portion realize limiting fit so as to limit the movement of the conductive connecting piece 40 in the first direction P and away from the first direction P; the second limiting portion and the second limited portion realize limit matching, so as to limit the movement of the conductive connecting member 40 in the second direction L. The mounting position of the conductive connecting member 40 in the mounting groove 30 is stable, so that the first contact surface 41a of the conductive connecting member 40 faces the rear of the developing cartridge 10 and the conductive connecting member 40 is prevented from moving in the first direction P and the second direction L, the contact of the conductive connecting member 40 with the chip contact 13 of the image forming apparatus 1 is stable, and the structure is simple, the manufacturing cost is low, and the detachment and replacement are convenient.

Further, as shown in fig. 3, the mounting groove 30 is provided on the second side 10b, that is, a side close to the door cover 11 when mounted to the image forming apparatus 1, and the mounting groove 30 is provided on the rear side of the developing cartridge 10 in the first direction P, and as shown in fig. 4, the mounting groove 30 includes therein a first groove wall surface 30a, a second groove wall surface 30b, a third groove wall surface 30c, and a fourth groove wall surface 30d, the first groove wall surface 30a and the second groove wall surface 30b being disposed opposite to each other, and the first groove wall surface 30a being located on the rear side (that is, the-X-axis direction side) of the second groove wall surface 30b, the third groove wall surface 30c and the fourth groove wall surface 30d being disposed opposite to each other, and the third groove wall surface 30c being located on the + Y-axis direction side of the fourth groove wall surface 30 d.

In the present embodiment, five mounting grooves 30 are provided, five mounting grooves 30 are spaced on the developing cartridge 10 along the Y-axis direction, and five conductive connecting members 40 can be mounted on the corresponding five mounting grooves 30, and those skilled in the art can know that the number and relative relationship of the mounting grooves 30 can be changed according to actual situations, and are not limited herein.

As shown in fig. 4, the first opening 31 is provided on the wall surface of the second side 10b, the chip contact 13 can pass through the first opening 31 and then abut against the first contact surface 41a of the conductive connection member 40, the conductive connection member 40 further includes a sheet-shaped substrate 44, the substrate 44 is located on the XY plane, the first contact portion includes a first sheet body 41, the first sheet body 41 is also sheet-shaped, a first end of the first sheet body 41 is connected to an end of the substrate 44 located on the-X axis direction side, a second end of the first sheet body 41 extends toward the + Z axis direction side relative to the first end, and the first contact surface 41a is formed on the wall surface of the first sheet body 41 located on the-X axis direction side.

In a state that the conductive connecting member 40 is mounted in the mounting groove 30, the first contact surface 41a is disposed closely to the first groove wall surface 30a and exposed through the first opening 31, and the conductive connecting member 40 is limited to a fixed position by the limit fit of the first limiting portion with the first limited portion, the second limiting portion with the second limited portion, and the first contact surface 41a can be stably and electrically connected with the chip contact 13 in a surface contact manner and continuously provide a compression force to the chip contact 13, so that the chip contact 13 is prevented from moving from a retracted position to an initial position due to vibrations of the developing cartridge 10 and the imaging device 1.

In order to limit the movement of the conductive connecting member 40 in the first direction P, as a preferred embodiment of the present embodiment, the first limited portion includes a second plate 42, the second plate 42 is a thin plate, a first end of the second plate 42 is connected to one end of the first plate 41 located at the + Y axis direction side and/or the-Y axis direction side, and a second end of the second plate 42 extends toward the + X axis direction side relative to the first end, it can be understood that the second plate 42 may not extend exactly along the + X axis direction side, but may be inclined with respect to the X axis direction, in this embodiment, to improve the limiting effect, two second plates 42 are provided, two second plates 42 are symmetrically provided at two sides of the Y axis of the first plate 41, and the second plates 42 may be formed by bending the first plate 41, or may be formed by welding the first plate 41, and are not limited herein.

The first restriction portion includes two first protrusions 33, the two first protrusions 33 are symmetrically provided on the third groove wall surface 30c and the fourth groove wall surface 30d, and are provided close to the first groove wall surface 30a, and a first clamping gap 37 is formed between an outer surface of the first protrusion 33 on the-X axis direction side and the first groove wall surface 30 a; in a state where the conductive connector 40 is mounted in the mounting groove 30, the second blade 42 is bent from the first blade 41 and clamped by the first clamping gap 37 to restrict movement of the conductive connector 40 in the X-axis direction. The second blade 42 has one end abutting on the first projection 33 and the other end abutting on the first groove wall surface 30a, thereby restricting the movement of the conductive connecting member 40 in the X-axis direction (i.e., preventing the movement in the first direction P of the developing cartridge 10 and the direction opposite to the first direction P), and at the same time, allowing the first contact surface 41a to abut on the first groove wall surface 30 a.

In order to restrict the movement of the conductive connecting member 40 in the second direction L, as a preferable technical solution of this embodiment, the second restricted portion includes a third body 43, the third body 43 is a thin sheet structure, a first end of the third body 43 is connected to an end of the substrate 44 located at the + X axis direction side, a second end of the third body 43 extends toward the + Z axis direction side relative to the first end, and the third body 43 and the first body 41 are arranged in parallel.

The second restricting portion includes a second protrusion 34 and a third protrusion 35, the second protrusion 34 is disposed on the second groove wall surface 30b, the third protrusion 35 is disposed on the second protrusion 34 to form an "L" shaped structure, and the third protrusion 35 is away from the second groove wall surface 30b relative to the second protrusion 34. In a state where the conductive connection member 40 is mounted in the mounting groove 30, the third plate 43 abuts against the third protrusion 35, and the third protrusion 35 provides a force in the-Z-axis direction to the third plate 43 to limit the movement of the conductive connection member 40 in the + Z-axis direction side (i.e., prevent the movement in the second direction L of the conductive connection member 40).

Further, in order to further limit the movement of the conductive connecting member 40 in the first direction P, a fourth protrusion 36 is protruded from corresponding positions on the third groove wall surface 30c and the fourth groove wall surface 30d, the fourth protrusion 36 is located at a rear side (i.e., -X axis direction side) of the second protrusion 34, i.e., between the second protrusion 34 and the first protrusion 33, the fourth protrusion 36 is located close to the second groove wall surface 30b, and a second clamping gap 38 is formed between the second protrusion 34 and the fourth protrusion 36.

In a state where the conductive connector 40 is mounted in the mounting groove 30, the third piece 43 is clamped in the second clamping gap 38 to limit the movement of the conductive connector 40 in the X-axis direction. One end of the third plate 43 abuts against the groove wall surface of the second projection 34 and the other end abuts against the opposite groove wall surface of the third projection 35, so that the movement of the conductive connecting member 40 in the X-axis direction is restricted (i.e., the movement in the first direction P and the direction opposite to the first direction P of the developing cartridge 10 is prevented), and at the same time, the first contact surface 41a can be made to abut against the first groove wall surface 30 a.

Further, the first protrusion 33 and the fourth protrusion 36 have a height higher than that of the second protrusion 34, and preferably, the top portions of the first protrusion 33 and the second protrusion 34 are maintained at the same height, and in a state where the conductive connection member 40 is mounted in the mounting groove 30, the substrate 44 abuts against the first protrusion 33 and the fourth protrusion 36 to restrict the movement of the conductive connection member 40 on the + Z-axis direction side, and the first protrusion 33 and the fourth protrusion 36 provide a force to one-Z-axis direction side of the substrate 44, so that the substrate 44 is supported on the first protrusion 33 and the fourth protrusion 36, and the conductive connection member 40 is more stably fixed and is not easily displaced under the vibration of the developing cartridge 10 and the image forming apparatus 1.

Further, the second contact portion includes an avoiding groove 45 and an elastic cantilever 46, the avoiding groove 45 penetrates through the substrate 44, preferably, the avoiding groove is located at a junction of the substrate 44 and the third sheet 43, the elastic cantilever 46 is made of a metal material, a first end of the elastic cantilever 46 is connected to a groove wall of the avoiding groove 45, a second end of the elastic cantilever 46 extends to the + X-axis direction side and the-Z-axis direction side relative to the first end, the second opening 32 is located on a wall surface of the third side 10c, and the second end of the elastic cantilever 46 protrudes out of the second opening 32 and then is electrically connected to the chip 20. When the elastic cantilever 46 is pressed down by the chip 20, the second end of the elastic cantilever 46 moves towards the direction close to the substrate 44 and abuts against the second bump 34, the second bump 34 provides a supporting force for the elastic cantilever 46, and the second bump 34 and the chip 20 jointly clamp the elastic cantilever 46, so that the contact between the terminal of the chip 20 and the conductive connecting member 40 is more stable and reliable.

For protecting chip 20, still including chip protecting cover 50, specifically, chip protecting cover 50 cover in on the chip 20, and with it is fixed that the developing box 10 joint is fixed. When the conductive connecting member 40 and the chip 20 are installed, the conductive connecting member 40 can be installed in the installation groove 30, the chip 20 is clamped on the developing box 10, and the chip protecting cover 50 is clamped on the developing box 10 to protect the chip 20.

The construction, features and functions of the present invention are described in detail in the embodiments illustrated in the drawings, which are only preferred embodiments of the present invention, but the present invention is not limited by the drawings, and all equivalent embodiments modified or changed according to the idea of the present invention should fall within the protection scope of the present invention without departing from the spirit of the present invention covered by the description and the drawings.

Claims

1. A developing cartridge detachably mountable to an image forming apparatus in a first direction, the image forming apparatus including a door cover on which a chip contact is provided, the developing cartridge comprising:

a chip;

a developing roller;

the conductive connecting piece can be installed in the installation groove along a second direction, and is characterized by comprising a first contact part, a first limited part and a second limited part, wherein:

2. A developing cartridge according to claim 1, wherein:

in the first direction, the mounting groove is arranged at the rear side of the developing box and comprises a first groove wall surface, a second groove wall surface, a third groove wall surface and a fourth groove wall surface, the first groove wall surface and the second groove wall surface are oppositely arranged along the first direction, the first groove wall surface is positioned at the rear side of the second groove wall surface, and the third groove wall surface and the fourth groove wall surface are oppositely arranged along the axial direction of the developing roller;

3. A developing cartridge according to claim 2, wherein:

the first limiting part comprises a first bulge, the first bulge is arranged on the third groove wall surface and/or the fourth groove wall surface in a protruding mode, and a first clamping gap is formed between the wall surface of the first bulge, which is deviated from the first direction, and the first groove wall surface;

4. A developing cartridge according to claim 3, wherein: and when the conductive connecting piece is arranged in the mounting groove, the substrate is abutted against the first bulge so as to limit the movement of the conductive connecting piece in the second direction.

5. A developing cartridge according to claim 2, wherein: the second restrained portion includes a third sheet connected to the substrate;

6. A developing cartridge according to claim 5, wherein: a fourth bulge is convexly arranged on the third groove wall surface and/or the fourth groove wall surface, the fourth bulge is positioned at the rear side of the second bulge in the first direction, and a second clamping gap is formed between the second bulge and the fourth bulge;

7. A developing cartridge according to claim 5, wherein: the mounting groove is provided with a second opening, the conductive connecting piece is provided with a second contact part, and the chip is electrically connected with the second contact part through the second opening.

8. A developing cartridge according to claim 7, wherein: the second contact part comprises an avoiding groove and an elastic cantilever, wherein the first end of the elastic cantilever is elastically connected to the groove wall of the avoiding groove, and when the elastic cantilever receives the pressing action force of the chip, the second end of the elastic cantilever moves towards the direction close to the substrate and abuts against the second protrusion.

9. A developing cartridge according to claim 1, wherein: the chip contact head is elastically connected to the door cover through an elastic piece, so that the chip contact head can elastically stretch and retract in a reciprocating mode in a first direction, and the end face of the chip contact head abuts against the first contact face through the first opening to achieve electric connection.

10. A developing cartridge according to any one of claims 2-9, wherein said developing cartridge further has a driving end and a conductive end which are oppositely provided in an axial direction of said developing roller, said conductive coupling member being located close to said conductive end with respect to said driving end; the chip is located at a bottom of the developing cartridge in a state where the developing cartridge is mounted to the image forming apparatus.