# US 2021/0278799 A1 · Image forming apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0278799 A1 - Document ID: US20210278799A1 - Status: Published application - Kind: A1 - Application number: 17/327,960 - Filed: 2021-05-24 - Published: 2021-09-09 - Earliest claimed: 2019-09-02 - Assignees: Brother Kogyo Kabushiki Kaisha - Applicants: Brother Kogyo Kabushiki Kaisha - Inventors: Shougo SATO - Web page: https://patentgrep.com/patent/US20210278799A1 ## CPC - G03G 21/1676: {for the developer unit} - G03G 21/1647: {Mechanical connection means} - G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY ## Abstract An image forming apparatus includes: a drawer movable between an inside position and an outside position; a drum cartridge including a photoconductive drum rotatable about a first axis; and a developing cartridge including a developing roller rotatable about a second axis. The drum cartridge includes a first developing-roller guide pivotable between a first position where the first developing-roller guide guides the developing roller when the developing cartridge is mounted on the drawer with the drum cartridge being mounted on the drawer, and a second position where the first developing-roller guide guides the developing roller with the drum cartridge and the developing cartridge being mounted on the drawer. The second axis is located below the first axis in a state in which the drum cartridge and the developing cartridge are mounted on the drawer, and the first developing-roller guide is located at the second position. ## Claims ### Claim 1 An image forming apparatus, comprising: a housing; a drawer movable between an inside position at which the drawer is located inside the housing, and an outside position at which the drawer is located outside the housing; a developing cartridge mountable on the drawer and comprising a developing roller; and a drum cartridge mountable on the drawer and comprising: a photoconductive drum; and a first developing-roller guide that guides the developing roller in a state in which the drum cartridge and the developing cartridge are mounted on the drawer, wherein the drawer comprises a pressing member that holds the developing roller in contact with the photoconductive drum by pressing the developing cartridge in the state in which the drum cartridge and the developing cartridge are mounted on the drawer. ### Claim 2 (depends on 1) The image forming apparatus according to claim 1, wherein the drawer comprises a drum guide that guides the drum cartridge when the drum cartridge is mounted on the drawer, and wherein the first developing-roller guide is located at a position between the photoconductive drum and the pressing member in a moving direction of the drawer. ### Claim 3 (depends on 1) The image forming apparatus according to claim 1, wherein the pressing member is located below the first developing-roller guide. ### Claim 4 (depends on 3) The image forming apparatus according to claim 3, wherein the first developing-roller guide is located below a rotation axis of the photoconductive drum. ### Claim 5 (depends on 1) The image forming apparatus according to claim 1, wherein the drawer comprises a bottom plate, and wherein the pressing member is mounted on the bottom plate. ### Claim 6 (depends on 1) The image forming apparatus according to claim 1, wherein the drawer comprises a second developing-roller guide that guides the developing roller when the developing cartridge is mounted on the drawer, wherein the first developing-roller guide is pivotable between (i) a first position at which the first developing-roller guide guides the developing roller when the developing cartridge is mounted on the drawer, and (ii) a second position at which the first developing-roller guide guides the developing roller in the state in which the drum cartridge and the developing cartridge are mounted on the drawer, and wherein the first developing-roller guide is connected to the second developing-roller guide in a state in which the drum cartridge is mounted on the drawer, and the first developing-roller guide is located at the first position. ### Claim 7 (depends on 6) The image forming apparatus according to claim 6, wherein the first developing-roller guide is located inside the housing, and at least a portion of the second developing-roller guide is located outside the housing in a state in which the drum cartridge is mounted on the drawer, and the drawer is located at the outside position ### Claim 8 (depends on 1) The image forming apparatus according to claim 1, wherein the drawer comprises a lock member pivotable between a lock position at which the drum cartridge is locked to the drawer, and a lock release position at which lock of the drum cartridge to the drawer is released, in the state in which the drum cartridge is mounted on the drawer. ### Claim 9 (depends on 8) The image forming apparatus according to claim 8, wherein the drawer comprises a lever configured to cause the lock member to pivot from the lock position to the lock release position. ### Claim 10 (depends on 9) The image forming apparatus according to claim 9, wherein the lever is located outside the housing in a state in which the drawer is located at the outside position. ### Claim 11 (depends on 9) The image forming apparatus according to claim 9, wherein the drawer comprises a linking member that connects the lock member and the lever to each other. ### Claim 12 (depends on 1) The image forming apparatus according to claim 1, wherein the housing comprises a contact surface that contacts an end portion of the photoconductive drum in a state in which the drum cartridge is mounted on the drawer, and the drawer is located at the outside position, and the contact surface extends in a direction intersecting a moving direction of the drawer. ### Claim 13 (depends on 1) The image forming apparatus according to claim 1, wherein the developing cartridge is located outside the housing in a state in which the drum cartridge and the developing cartridge are mounted on the drawer, and the drawer is located at the outside position. ### Claim 14 (depends on 1) The image forming apparatus according to claim 1, wherein the photoconductive drum is located inside the housing in a state in which the drum cartridge and the developing cartridge are mounted on the drawer, and the drawer is located at the outside position.