# US 12,601,990 B2 · Developing cartridge > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,601,990 B2 - Document ID: US12601990B2 - Status: Granted - Kind: B2 - Application number: 18/968,837 - Filed: 2024-12-04 - Published: 2025-03-20 - Granted: 2026-04-14 - Earliest claimed: 2023-04-27 - Assignees: Jiangxi Yibo E-Tech Co. Ltd. - Applicants: Jiangxi Yibo E-Tech Co. Ltd. - Inventors: Jian Peng; Liangliang Hu; Rongli Xu - Web page: https://patentgrep.com/patent/US12601990B2 ## CPC - G03G 15/0872: {the developer cartridges being generally horizontally mounted parallel to its longitudinal rotational axis} - G03G 15/0808: {characterised by the developer supplying means, e.g. structure of developer supply roller} - G03G 15/0812: {characterised by the developer regulating means, e.g. structure of doctor blade} - G03G 21/1647: {Mechanical connection means} - G03G 21/1652: {Electrical connection means} - G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY ## Abstract A developing cartridge includes: a developing roller rotatable about a rotational axis extending in a first direction; a casing configured to accommodate developer therein; an input gear rotatable about a first axis extending in the first direction, the input gear being positioned at one side of the casing in the first direction; an electrode with an electrical contact surface. The developing roller has a developing roller shaft extending in the first direction, a covering layer covering a surface of the developing roller shaft, and an elastic layer rotating synchronously with the developing roller shaft; and the electrical contact surface is electrically connected to a component of the developing cartridge, and the covering layer is made of a non-metallic material or an electrically insulating material. ## Claims ### Claim 1 A developing cartridge, comprising: a developing roller rotatable about a rotational axis extending in a first direction; a casing configured to accommodate developer therein; an input gear rotatable about a first axis extending in the first direction, the input gear being positioned at one side of the casing in the first direction; an electrode with an electrical contact surface; wherein the developing roller comprises a developing roller shaft extending in the first direction, a covering layer covering a surface of the developing roller shaft, and an elastic layer rotating synchronously with the developing roller shaft; wherein the electrical contact surface is electrically connected to a component of the developing cartridge, and the covering layer is made of a non-metallic material or an electrically insulating material. ### Claim 2 (depends on 1) The developing cartridge according to claim 1, wherein the electrical contact surface is positioned at another side of the casing in the first direction. ### Claim 3 (depends on 1) The developing cartridge according to claim 1, wherein the component contacts the elastic layer of the developing roller. ### Claim 4 (depends on 1) The developing cartridge according to claim 1, wherein an electrical resistance between the electrical contact surface and the developing roller shaft is greater than an electrical resistance between the electrical contact surface and the elastic layer. ### Claim 5 (depends on 1) The developing cartridge according to claim 1, wherein at least a part of the covering layer is between the elastic layer and the developing roller shaft. ### Claim 6 (depends on 1) The developing cartridge according to claim 1, further comprising a supply roller, wherein the supply roller is rotatable about a second axis extending in the first direction, and the component is the supply roller. ### Claim 7 (depends on 1) The developing cartridge according to claim 1, further comprising a bracket positioned at another side of the casing in the first direction, wherein the electrode is supported on the bracket, one end of the developing roller shaft is supported on the bracket. ### Claim 8 (depends on 1) The developing cartridge according to claim 1, further comprising a bracket positioned at another side of the casing in the first direction, wherein the bracket comprises a developing roller bearing thereon, and the covering layer is supported by the developing roller bearing. ### Claim 9 (depends on 1) The developing cartridge according to claim 1, further comprising a storage unit, at the one side of the casing, and the storage unit and the covering layer are separated in a second direction different from the first direction. ### Claim 10 (depends on 1) The developing cartridge according to claim 1, wherein a through hole is provided at an end of the developing roller shaft. ### Claim 11 (depends on 1) The developing cartridge according to claim 1, further comprising an urging protrusion and a storage unit, wherein the storage unit is at the one side of the casing, and the urging protrusion is positioned between the covering layer and the storage unit in a second direction intersecting the first direction. ### Claim 12 (depends on 1) The developing cartridge according to claim 1, further comprising a layer thickness regulating member configured to regulate a thickness of a developer layer carried on a surface of the developing roller, the component is the layer thickness regulating member. ### Claim 13 (depends on 1) The developing cartridge according to claim 1, further comprising an electrical connector at the one side of the casing in the first direction; wherein the electrical connector is electrically connected to the component of the developing cartridge, and the electrical connector is movable between a first position at which the electrical connector is electrically connected to a grounded metal frame outside the developing cartridge, and a second position at which the electrical connector is electrically disconnected from the grounded metal frame. ### Claim 14 (depends on 13) The developing cartridge according to claim 13, further comprising a protrusion, wherein the protrusion is movable according to rotation of the input gear, and the electrical connector moves between the first position and the second position according to movement of the protrusion. ### Claim 15 A developing cartridge, comprising: a developing roller rotatable about a rotational axis extending in a first direction; a casing configured to accommodate developer therein; an input gear rotatable about a first axis extending in the first direction, the input gear being positioned at one side of the casing in the first direction; an electrode with an electrical contact surface, and the electrical contact surface being positioned at another side of the casing in the first direction; the electrical contact surface is electrically connected to a component of the developing cartridge, the developing roller comprises a developing roller shaft extending in the first direction and an elastic layer rotating synchronously with the developing roller shaft, and an electrical resistance between the electrical contact surface and the developing roller shaft is greater than or equal to 1 MΩ. ### Claim 16 (depends on 15) The developing cartridge according to claim 15, wherein the electrical resistance is greater than or equal to 20 MΩ. ### Claim 17 (depends on 15) The developing cartridge according to claim 15, wherein the developing roller further comprises a covering layer covering a surface of the developing roller shaft, and the electrical resistance is greater than an electrical resistance between the electrical contact surface and the elastic layer. ### Claim 18 (depends on 15) The developing cartridge according to claim 15, further comprising a bracket at another side of the casing, wherein the bracket comprises a developing roller bearing thereon, a surface of the developing roller shaft is covered with a covering layer, the covering layer is made of an electrically insulating material, and the covering layer is supported by the developing roller bearing. ### Claim 19 (depends on 15) The developing cartridge according to claim 15, further comprising a supply roller, wherein the supply roller comprises a supply roller shaft, the supply roller shaft is rotatable about a second axis extending in the first direction, and an electrical resistance between the electrical contact surface and the supply roller shaft is greater than 10 MΩ. ### Claim 20 (depends on 15) The developing cartridge according to claim 15, wherein a through hole is provided at an end of the developing roller shaft.