CN114442449A - A developing cartridge, a processing cartridge and an electronic imaging device - Google Patents

Abstract

The invention discloses a developing cartridge, which is detachably installed in a drum unit, the drum unit is detachably installed in an electronic imaging device, and the electronic imaging device includes a power supply component; the drum unit includes: a first casing a photosensitive drum, rotatably supported on the first casing, and rotating along a steel shaft extending in the longitudinal direction of the first casing; the developing cartridge comprises: a second casing; a developing roller, rotatable is supported on the second casing and rotates along a developing roller shaft extending in the longitudinal direction of the second casing; and also includes a conductive portion including an input contact, an output contact and a ground contact ; The input contact is electrically connected with the power supply member, the output contact is electrically connected with the developing roller shaft, and the ground contact is grounded.

Description

A developing cartridge, a processing cartridge and an electronic imaging device

technical field

The invention relates to the technical field of electronic imaging, in particular to a developing cartridge, a processing cartridge and an electronic imaging device.

Background technique

When the developing cartridge in the existing image forming device performs development work, it needs to provide power for the developing roller and the powder feeding roller. Usually, two electrodes are set to receive different voltages from the electronic imaging device to supply power to the developing roller and the powder feeding roller, respectively. In order to miniaturize processing and reduce costs, in some schemes, two electrodes are made into an integrated structure, so that the developing roller and the powder feeding roller are powered by receiving voltage through one electrode contact (the electrode of the powder feeding roller), but the developing roller and the powder feeding roller are not supplied with electricity. The same voltage is applied to the rollers, which seriously affects the print quality of the image forming apparatus.

SUMMARY OF THE INVENTION

The main purpose of the present invention is to provide a developing cartridge, which can improve the printing quality of the image forming device. In order to achieve the above technical effect, the present invention is achieved through the following technical solutions:

A developing cartridge is detachably installed in a drum unit, the drum unit is detachably installed in an electronic imaging device, and the electronic imaging device includes a power supply component;

The drum unit includes: a first casing;

a photosensitive drum, rotatably supported on the first casing, to rotate along a steel shaft extending in the longitudinal direction of the first casing;

The developing cartridge includes:

the second shell;

a developing roller, rotatably supported on the second casing, to rotate along a developing roller shaft extending in the longitudinal direction of the second casing;

It is characterized in that it also includes a conductive part, the conductive part includes an input contact, an output contact and a ground contact; the input contact is electrically connected to the power supply component, and the output contact is connected to the developing roller shaft Electrically connected, the ground contact is grounded. .

Further, the steel shaft is grounded, and the ground contact is connected to the steel shaft.

Further, the conductive part further includes a first impedance unit and a second impedance unit, the first impedance unit is electrically connected between the input contact and the output contact, and the second impedance unit is electrically connected between the output contact and the ground contact.

Further, the resistance value of the first impedance unit is greater than 1MΩ, and the resistance value of the second impedance unit is greater than 1MΩ.

Further, the first impedance unit includes a first connection segment, the second impedance unit includes a second electrical connection segment, the first electrical connection segment is configured as a resin having conductivity, and the second connection segment is configured It is a conductive resin.

Further, the first impedance unit includes a first connection conductor and a first resistance element disposed on the connection conductor, and the second impedance unit includes a second connection conductor and a first resistance element disposed on the second connection conductor. The second resistance element; the resistance value of the first resistance element is greater than 1MΩ, and the resistance value of the second resistance element is greater than 1MΩ.

Further, the conductive portion includes a first plane, a second plane, and a stepped portion or an inclined plane connecting the first plane and the second plane.

Further, the conductive part further includes a step-down chip, the input pin of the step-down chip is connected to the input contact, the input pin of the step-down unit is connected to the output contact, and the step-down chip has an input pin connected to the output contact. Ground pin to ground.

The present invention also provides a process cartridge, which is detachably mounted on an electronic imaging device, and the electronic imaging device includes a power supply component, characterized in that it includes:

Drum unit, including:

the first shell;

a photosensitive drum, rotatably supported on the first casing, to rotate along a steel shaft extending in the longitudinal direction of the first casing;

and the aforementioned developing cartridge.

The present invention also provides an electronic imaging device, comprising:

power supply components;

and the above-mentioned developing cartridge detachably installed in the electronic imaging device.

After adopting the above technical solution, the present invention provides a new electrical transmission structure, the input contact, the output contact and the ground contact form a complete electrical transmission loop, and the power supply component in the electronic imaging device is fed from the input contact through the input contact. The input voltage is output to the developing roller by the output contact after processing, so as to realize the adaptation of the applied voltage of the developing roller and ensure the printing quality of the electronic imaging device.

Description of drawings

1 is a schematic three-dimensional structure diagram of a process cartridge in Embodiment 1 of the present invention;

2 is a schematic diagram of an exploded structure of a first angle of the process cartridge in Embodiment 1 of the present invention;

3 is a schematic structural diagram of a first angle of the process cartridge in Embodiment 1 of the present invention;

4 is a schematic structural diagram of the first embodiment of the present invention and the first angle of the drum unit without a first shell;

5 is a schematic diagram of a partially exploded structure of the second angle of the developing cartridge in Embodiment 1 of the present invention;

6 is a schematic three-dimensional structure diagram of a receiving bracket of the developing cartridge in Embodiment 1 of the present invention;

7 is a schematic three-dimensional structural diagram of the conductive support of the developing cartridge in Embodiment 1 of the present invention;

8 is a schematic three-dimensional structural diagram of the conductive support of the developing cartridge in Embodiment 1 of the present invention;

9 is an equivalent circuit schematic diagram of the conductive support of the developing cartridge in Embodiment 1 of the present invention;

10 is a schematic three-dimensional structure diagram of the conductive portion of the developing cartridge in the second embodiment of the present invention;

11 is a schematic three-dimensional structure diagram of a developing cartridge in Embodiment 3 of the present invention;

12 is a schematic diagram of the exploded structure of the developing cartridge in the third embodiment of the present invention.

Detailed ways

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

As shown in FIGS. 1 to 12 , the present invention provides an electronic imaging apparatus, including: a power supply component and a process cartridge, wherein the process cartridge is detachably mounted on the electronic imaging apparatus, and includes a drum unit and a developing cartridge.

The drum unit 1 includes a photosensitive drum 11 , a charging roller 12 and a first casing 13 . The first casing 13 has a first side and a second side opposite to each other in the longitudinal direction, the first side is provided at the non-driving end of the developing cartridge, and the second side is provided at the driving end of the developing cartridge; the photosensitive drum 11 is longitudinally arranged. The photosensitive drum 11 is located on the second side of the first casing 13 and is provided with a coupling member, and the coupling member passes through the second side and is exposed to the outside of the second side. , for receiving the driving force of the image forming apparatus and driving the photosensitive drum 11 to rotate. The charging roller 12 is rotatably supported between the first side surface and the second side surface so that the charging roller 12 can rotate with the rotation of the photosensitive drum 11 while being in contact with the photosensitive drum 11 . The first casing 13 is formed with a waste toner box for accommodating the developer remaining in the transfer between the first side surface and the second side surface.

When the developing cartridge is installed in the electronic image forming apparatus and used, the developing cartridge 2 is now installed in the drum unit 1 to form a split-type process cartridge structure. The developing cartridge 2 includes a developing roller 21 , a powder feeding roller 22 and a second casing 23 . The second casing 23 is formed with a powder container for accommodating the developer; the developing roller 21 extends in the longitudinal direction and is used for carrying the developer, and is rotatably arranged on the second casing 23 and can be in contact with the photosensitive drum 11; The powder roller 22 is extended in the powder container in the longitudinal direction, and can be in contact with the developing roller 21 to charge the developer.

The developing cartridge 2 also includes a receiving bracket 24, which is an insulator, preferably an insulating plastic part, the receiving bracket is provided with a developing roller bearing 241 and a powder feeding roller bearing 242, and one end of the developing roller shaft of the developing roller 21 on the conductive side is rotatable. The powder feed roller 22 is rotatably supported in the powder feed roller bearing 242 at the end of the powder feed roller shaft on the conductive side.

The developing cartridge 2 further includes a conductive part 3, the conductive part 3 includes a conductive support 31 and an electrical connector 32, and the conductive support includes an input contact 311, an output contact 312, a ground contact 313, a first connection segment 314 and a second connection segment 315; wherein, a first connection segment 314 is formed between the input contact 311 and the output contact 312, a second connection segment 315 is formed between the output contact 312 and the ground contact 313, and the input contact 311 is connected to the imaging device. The power supply component (not shown) is electrically connected, the output contact 312 is electrically connected to the developing roller 21 through the electrical connector 32 , and the ground contact 313 is grounded. In this embodiment, the ground contact 313 is electrically connected to the steel shaft 14 of the photosensitive drum 11 . Since the steel shaft 14 of the photosensitive drum 11 is grounded, the ground contact 313 can be grounded through the steel shaft 14 of the photosensitive drum 11 . The first connection segment 314 is configured as a first impedance unit, and the second connection segment 315 is configured as a second impedance unit.

The conductive support 31 is a conductor with a certain impedance. In this embodiment, the conductive support 31 is constructed of a conductive resin, and a voltage is connected through the input contact 311. In other optional embodiments, the conductive support 31 can be conductive metals, etc. The input contact 311 is connected to the power supply component of the image forming apparatus, and the power supply component, the conductive support 31, the steel shaft 14 of the photosensitive drum 11 and the ground form a closed voltage dividing circuit. A resistor R1, the conductor part of the second connection section 315 is formed as a second resistor R2, the voltage connected to the input contact 311 is divided by the first resistor R1 and the second resistor R2 after the output contact 312 generates a voltage division Specifically, assuming that the voltage connected to the input contact 311 is V, and the voltage of the output contact 312 is V1, then the charging voltage formed at the output contact 312 is V1=V*R2/(R1+R2), For example, the charging voltage V1 required by the developing roller 21 in the developing cartridge is 400V, and the actual voltage V connected to the input contact 311 from the power supply component is 600V. At this time, the resistance value of the second resistor R2 needs to be set to the first Twice the resistance value of a resistor R1, that is, R2=2R1, that is, V1=600V*2R1/(R1+2R1)=400V. In practical applications, the resistance values of the first resistor R1 and the second resistor R2 can be adjusted according to the voltage connected to the input contact 311 and the actual demanded voltage of the developing roller 21 , and the design is flexible and the compatibility is strong.

The electrical connector 32 is constructed of conductive rubber or metal, the receiving bracket 24 is provided with a connecting hole 243, the electrical connector 32 is arranged in the connecting hole 243, one end of the electrical connector 32 is connected to the developing roller shaft, and the electrical connector 32 The other end of the electrical connector 32 is connected to the output contact 312 of the conductive support 31 , the conductive support 31 is provided with a fixing column 316 , and the other end of the electrical connector 32 is sleeved on the fixing column 316 . In this embodiment, in order to counteract the beating of the developing roller 21 during the rotation process and ensure good electrical contact, the electrical connection member 32 is configured as a conductive elastic member, such as a compression spring made of metal, an electrical connection member 32 is in a compressed state after installation, and the force generated by the elastic deformation of the compression spring ensures the effective contact of the electrical connector with the output contact 312 and the developing roller shaft, and ensures the power transmission between the conductive bracket 31 and the developing roller 21 .

The conductive support 31 is made of a conductive material with a megohm-level resistance, the resistance of the first resistor R1 and the resistance of the second resistor R2 are both greater than 1 megohm, and the output voltage of the existing imaging device is roughly in the hundreds of volts level. , the magnitude of the current formed in the voltage divider circuit is below the milliamp level. In this embodiment, the constituent material of the conductive support is made by adding a predetermined proportion of metal powder to POM (Polyoxymethylene, polyoxymethylene). The constituent material has a certain weak conductivity. When the input contact 311 is connected to a voltage, A voltage value of a predetermined charging voltage may be formed at the output contact 312 . In practical applications, the ratio of the metal powder in the conductive support 31 can be adjusted according to the practical application, so as to adjust the impedance values of the first connection section 314 and the second connection section 315 .

The first connection segment 314 and the second connection segment 315 are located on different planes, the first connection segment 314 of the conductive bracket 31 is arranged on the second housing 21 , and the second connection segment 315 is arranged on the surface of the first housing 11 , The first connecting segment 314 is located on the first plane, the second connecting segment 315 is located on the second plane, and the output contact 312 has a stepped surface, and the stepped portion is used to connect the first plane and the second plane. Since the conductive bracket 31 is connected between the first plane and the second plane by an inclined surface or a stepped surface, when the developing cartridge is installed in the image forming apparatus, the inclined surface or the stepped surface can play a guiding role, so that the installation process is smooth. , the power supply part of the imaging device is in contact with the input contact 311 located on the first plane of the conductive support 31 , so that a stable electrical connection can be established.

The developing cartridge of the present invention provides a new electrical transmission structure. The input contact, the output contact and the ground contact form a complete electrical transmission circuit. The input contact is connected to the voltage from the power supply component in the electronic imaging device, and the voltage is passed through the input contact. After processing, it is output from the output contact to the developing roller to realize the adaptation of the voltage applied by the developing roller, and to ensure the printing quality of the electronic imaging device.

Embodiment 2

As shown in FIG. 10 , in this embodiment, the conductive part 3 includes a first impedance unit and a second impedance unit. The first impedance unit includes a first connection conductor 414 and a first resistance element 416 disposed on the first connection conductor, and the second impedance unit includes a second connection conductor 415 and a second resistance element 417 disposed on the second connection conductor 415 ; The resistance value of the first resistance element 416 is greater than 1MΩ, and the resistance value of the second resistance element 417 is greater than 1MΩ. The first connection conductor 414 and the second connection conductor 415 are both benign conductors, and their resistance values are much smaller than the first resistance element 416 and the second resistance element 416 and can be ignored.

In this embodiment, in order to maintain the stability of the overall structure of the developing cartridge, the first connecting conductor 414 and the second connecting conductor 415 are formed as conductive rubber or conductive metal sheets, and the first resistive element 416 and the second resistive element 417 can be embedded and disposed respectively The first connecting conductor 414 and the second connecting conductor 414 are electrically connected to the conductive rubber, or correspondingly welded to the conductive metal sheet. The input contact 411 and the output contact 412 are both configured as conductive rubber or conductive metal sheets, the first connection conductor 414 is electrically connected between the input contact 411 and the output contact 412, and the second connection conductor 415 is electrically connected to the output contact Between 412 and the ground contact 313, the input contact 411 can be connected to the power supply component in the image forming device to access the voltage, the output contact 412 The output contact 412 is electrically connected to the developing roller 21 through the electrical connection member 32, and the ground contact 413 It may be grounded through the steel shaft 14 of the photosensitive drum 11 . In one of the embodiments, the ground contact 413 may be formed by one end of the second connecting conductor 417 through which the steel shaft 14 of the photosensitive drum 11 is directly connected to the ground.

The power supply component, the first resistor R1 element, the second resistor R2 element, the steel shaft 14 of the photosensitive drum 11 and the ground form a closed voltage divider circuit, and the voltage connected to the input contact 311 passes through the first resistor element 416 and the second The divided voltage of the resistive element 417 generates the divided charging voltage at the output contact 312 , and the equivalent circuit thereof is the same as that in the first embodiment, and will not be repeated here. In practical application, resistance elements with different resistance values can be selected according to the actual situation, without changing the existing structure of the developing cartridge, simplifying the design and reducing the production cost.

Embodiment 3

As shown in FIG. 11 and FIG. 12 , in this embodiment, the conductive part 3 includes a step-down chip 4 , the input pin of the step-down chip 4 is connected to the input contact 511 , the input pin of the step-down chip is connected to the output contact 512 , and the drop The ground pin of the pressure chip 4 is grounded to the steel shaft 14 of the photosensitive drum 11 . The second housing 23 is provided with a chip frame, the step-down chip 4 is detachably mounted on the chip frame, and each pin of the step-down chip 4 can be connected to each contact point of each conductive part through a wire. The step-down chip is connected to the voltage through the input contact, and the chip is subjected to the step-down treatment to output a voltage suitable for the developing roller, and then directly output to the developing roller through the output contact, without complex conductive structure, the voltage is stable, which is beneficial to The developing cartridge is miniaturized.

The above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The recorded technical solutions are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A developing cartridge, detachably mounted in a drum unit, the drum unit being detachably mounted on an electronic imaging device, the electronic imaging device comprising a power supply component; The drum unit includes: a first casing; a photosensitive drum, rotatably supported on the first casing, to rotate along a steel shaft extending in the longitudinal direction of the first casing; The developing cartridge includes: the second shell; a developing roller, rotatably supported on the second casing, to rotate along a developing roller shaft extending in the longitudinal direction of the second casing; It is characterized in that it also includes a conductive part, the conductive part includes an input contact, an output contact and a ground contact; the input contact is electrically connected to the power supply component, and the output contact is connected to the developing roller shaft Electrically connected, the ground contact is grounded. 2 . The developing cartridge according to claim 1 , wherein the steel shaft is grounded, and the ground contact is connected to the steel shaft. 3 . 3 . The developing cartridge according to claim 1 , wherein the conductive portion further comprises a first impedance unit and a second impedance unit, and the first impedance unit is electrically connected to the input contact and the output. 4 . Between the contacts, the second impedance unit is electrically connected between the output contact and the ground contact. 4 . The developing cartridge according to claim 3 , wherein the resistance value of the first impedance unit is greater than 1 MΩ, and the resistance value of the second impedance unit is greater than 1 MΩ. 5 . 5 . The developing cartridge of claim 3 , wherein the first impedance unit includes a first connection section, the second impedance unit includes a second connection section, and the first connection section is configured to have a conductive The second connecting segment is configured as a conductive resin. 6. The developing cartridge according to claim 3, wherein the first impedance unit comprises a first connection conductor and a first resistance element disposed on the first connection conductor, and the second impedance unit comprises A second connection conductor and a second resistance element disposed on the second connection conductor; the resistance of the first resistance element is greater than 1 MΩ, and the resistance of the second resistance element is greater than 1 MΩ. 7 . The developing cartridge according to claim 1 , wherein the conductive portion comprises a first plane, a second plane, and a stepped portion or an inclined plane connecting the first plane and the second plane. 8 . 8 . The developing cartridge according to claim 1 , wherein the conductive part further comprises a step-down chip, an input pin of the step-down chip is connected to the input contact, and an input pin of the step-down unit is connected to the input contact. 9 . The output contact is connected, and the ground pin of the step-down chip is grounded. 9. A process cartridge, detachably mounted on an electronic imaging device, the electronic imaging device comprising a power supply component, characterized in that it comprises: Drum unit, including: the first shell; a photosensitive drum, rotatably supported on the first casing, to rotate along a steel shaft extending in the longitudinal direction of the first casing; and the developing cartridge according to any one of claims 1 to 8, which is detachably installed in the drum unit. 10. An electronic imaging device, comprising: power supply components; and the developing cartridge according to any one of claims 1 to 8, which is detachably installed in an electronic imaging device.

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