# US 2017/0255126 A1 · Binary Ink Developer Assembly Including A Guard Member Including A Conforming End Having A Concave Shape > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0255126 A1 - Document ID: US20170255126A1 - Status: Published application - Kind: A1 - Application number: 15/521,791 - Filed: 2015-01-13 - Published: 2017-09-07 - Earliest claimed: 2015-01-13 - Assignees: Hewlett-Packard Indigo B.V. - Applicants: Hewlett-Packard Indigo B.V. - Inventors: Barak Rosenstein; David Sabo - Web page: https://patentgrep.com/patent/US20170255126A1 ## CPC - G03G 15/0877: {Arrangements for metering and dispensing developer from a developer cartridge into the development unit} - G03G 15/095: Removing excess solid developer {, e.g. fog preventing} - G03G 15/11: Removing excess liquid developer, e.g. by heat - G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY ## Abstract An example binary ink developer (BID) assembly includes a housing, a developer roller, a squeegee roller, and a guard member. The developer roller receives ink and transfers a portion of the ink to a photoconductive member. The squeegee roller rotates and regulates a film thickness of ink on the developer roller. The squeegee roller includes a curved circumference. The guard member includes a conforming end disposed across from the squeegee roller. Further, the conforming end has a concave shape corresponding to a portion of the curved circumference of the squeegee roller. ## Claims ### Claim 1 A binary ink developer assembly usable with a printing system, the binary ink developer assembly comprising: a housing; a developer roller to receive ink and transfer a portion of the ink to a photoconductive member; a squeegee roller to rotate and regulate a film thickness of ink on the developer roller, the squeegee roller including a curved circumference, and a guard member including a conforming end disposed across from the squeegee roller, the conforming end having a concave shape corresponding to a portion of the curved circumference of the squeegee roller. ### Claim 2 (depends on 1) The binary ink developer assembly of claim 1, wherein the concave shape of the conforming end of the guard member forms a first arc and a portion of the curved circumference of the squeegee roller forms a second arc directly across from the first arc such that the first arc and the second arc are concentric arcs. ### Claim 3 (depends on 1) The binary ink developer assembly of claim 1, further comprising: a space formed between the conforming end of the guard member and a respective portion of the curved circumference of the squeegee roller directly across therefrom is substantially uniform. ### Claim 4 (depends on 1) The binary ink developer assembly of claim 1, wherein a distance between the conforming end of the guard member and a respective portion of the curved circumference of the squeegee roller directly across therefrom is in a range of 0.2 millimeter (mm) to 0.7 mm. ### Claim 5 (depends on 1) The binary ink developer assembly of claim 1, wherein the concave shape of the conforming end of the guard member corresponding to the portion of the curved circumference of the squeegee roller and a rotation of the squeegee roller are to reduce an amount of ink from one side of the guard member to pass there between to another side of the guard member to exit the housing. ### Claim 6 (depends on 1) The binary ink developer assembly of claim 1, further comprising: a main electrode to create a potential bias with the developer roller to transfer the ink to the developer roller coupled to the guard member. ### Claim 7 (depends on 1) The binary ink developer assembly of claim 1, wherein the guard member is coupled to the housing. ### Claim 8 (depends on 1) The binary ink developer assembly of claim 1, further comprising: a cleaner roller in contact with the developer roller, the cleaner roller to rotate to clean the developer roller. ### Claim 9 (depends on 8) The binary ink developer assembly of claim 8, further comprising: a wiper in contact with the cleaner roller, the wiper to clean the cleaner roller during a rotation of the cleaner roller. ### Claim 10 (depends on 9) The binary ink developer assembly of claim 9, further comprising: a sponge roller in contact with the wiper, the sponge roller to clean the wiper. ### Claim 11 A method of operating a binary ink developer assembly, the method comprising: receiving ink by a developer roller of the binary ink developer (BID) assembly; rotating a squeegee roller having a curved circumference forming a second arc to regulate a film thickness of the ink on the developer roller; transferring a portion of the ink from the developer roller to a photoconductive member; and reducing an amount of ink unintentionally exiting a housing of the BID assembly by a conforming end of a guard member of the BID assembly having a concave shape forming a first arc corresponding to a portion of the curved circumference of the squeegee roller such that the first arc and the second arc are concentric arcs. ### Claim 12 (depends on 11) The method of claim 11, wherein the reducing an amount of ink unintentionally exiting a housing of the BID assembly by a conforming end of a guard member of the BID assembly having a concave shape corresponding to a portion of the curved circumference of the squeegee roller further comprises: reducing an amount of ink moving from one side to another side of the guard member between the conforming end and the squeegee roller. ### Claim 13 (depends on 11) The method of claim 11, further comprises: maintaining a substantially uniform space between the conforming end of the guard member and a respective portion of the curved circumference of the squeegee roller directly across therefrom. ### Claim 14 (depends on 1) The method of claim 1, further comprising: creating a potential bias with the developer roller by a main electrode to transfer the ink to the developer roller; rotating a cleaner roller in contact with the developer roller to clean the developer roller; cleaning the cleaner roller by a wiper in contact therewith during a rotation of the cleaner roller; and rotating a sponge roller in contact with a wiper to clean the wiper. ### Claim 15 (depends on 14) The method of claim 14, wherein the guard member is coupled to the main electrode.