# US 2014/0190300 A1 · Toner drum gear projection > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0190300 A1 - Document ID: US20140190300A1 - Status: Published application - Kind: A1 - Application number: 14/150,105 - Filed: 2014-01-08 - Published: 2014-07-10 - Earliest claimed: 2013-01-08 - Assignees: Clover Technologies Group, LLC - Applicants: Clover Technologies Group, LLC - Inventors: Francisco TAMPIER - Web page: https://patentgrep.com/patent/US20140190300A1 ## CPC - G03G 21/1647: {Mechanical connection means} - G03G 15/0865: {Arrangements for supplying new developer} - G03G 15/757: {Drive mechanisms for photosensitive medium, e.g. gears} - G03G 21/1857: {for transmitting mechanical drive power to the process cartridge, drive mechanisms, gears, couplings, braking mechanisms} - G03G 2221/1657: transmitting mechanical drive power - Y10T 74/19851: Gear and rotary bodies - G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A toner drum drive assembly is configured to engage a drive mechanism of a printer. The assembly includes a support portion defining an axis, and a drive projection extending axially from the support portion. The drive projection includes three radially outwardly and circumferentially extending arm portions, with each arm portion having an end. The drive projection defines three undercuts, and each undercut is positioned axially between the support portion and a respective arm portion end. ## Claims ### Claim 1 A toner drum drive assembly comprising: a support portion defining an axis; and a drive projection extending axially from the support portion, the drive projection including three radially outwardly and circumferentially extending arm portions, each arm portion having an end, and the drive projection defining three undercuts, each undercut positioned axially between the support portion and a respective arm portion end. ### Claim 2 (depends on 1) The toner drum drive assembly of claim 1, wherein the support portion includes an end face, and wherein the undercut is positioned between the end face and the respective arm portion end. ### Claim 3 (depends on 1) The toner drum drive assembly of claim 1, wherein the drive projection includes three first sides and three second sides arranged about the axis in an alternating manner. ### Claim 4 (depends on 3) The toner drum drive assembly of claim 3, wherein the first sides and the second sides are substantially planar and parallel to the axis. ### Claim 5 (depends on 3) The toner drum drive assembly of claim 3, wherein each first side resides in a respective first side plane, and wherein the first side planes define a first equilateral triangle when viewed along the axis. ### Claim 6 (depends on 5) The toner drum drive assembly of claim 5, wherein each second side resides in a respective second side plane, wherein the second side planes define a second equilateral triangle when viewed along the axis, and wherein the second equilateral triangle is rotated about the axis relative to the first equilateral triangle. ### Claim 7 (depends on 3) The toner drum drive assembly of claim 3, wherein the first and second sides are joined by three acute-angle corners and three obtuse-angle corners alternatingly spaced around the drive projection. ### Claim 8 (depends on 7) The toner drum drive assembly of claim 7, wherein the drive projection includes chamfers between adjacent first and second sides, wherein the chamfers are formed along a portion of each acute-angle corner and define the undercuts. ### Claim 9 (depends on 1) The toner drum drive assembly of claim 1, wherein the drive projection includes three convex sidewalls and three concave wall portions. ### Claim 10 (depends on 9) The toner drum drive assembly of claim 9, wherein each concave wall portion extends substantially radially outwardly away from the axis and joins a respective upright face. ### Claim 11 (depends on 10) The toner drum drive assembly of claim 10, wherein each upright face is substantially flat. ### Claim 12 (depends on 10) The toner drum drive assembly of claim 10, wherein each upright face extends between its respective concave wall portion and a respective adjacent one of the convex sidewalls. ### Claim 13 (depends on 10) The toner drum drive assembly of claim 10, wherein the drive projection includes three angle chamfers, each angle chamfer extending from a distal end of a respective concave wall portion to a respective adjacent one of the convex sidewalls. ### Claim 14 (depends on 13) The toner drum drive assembly of claim 13, wherein each angle chamfer defines a respective one of the undercuts. ### Claim 15 (depends on 9) The toner drum drive assembly of claim 9, wherein each convex sidewall includes a proximal end proximal to the axis and a distal end distal from the axis, and wherein each concave wall portion is positioned adjacent the proximal end of a respective one of the convex sidewalls. ### Claim 16 (depends on 15) The toner drum drive assembly of claim 15, wherein each concave wall portion provides a geometric transition between a generally circumferentially directed trajectory of the proximal end of its respective convex sidewall and a generally radially outwardly directed trajectory. ### Claim 17 (depends on 15) The toner drum drive assembly of claim 15, wherein the projection includes three generally semi-circular projecting members, each projecting member extending between a respective concave wall portion and the distal end of an adjacent one of the sidewalls. ### Claim 18 (depends on 17) The toner drum drive assembly of claim 17, wherein the projecting members define convex end portions of each arm portion. ### Claim 19 (depends on 17) The toner drum drive assembly of claim 17, wherein each undercut extends between the distal end of a respective sidewall and a respective concave wall portion, and is positioned below a respective one of the projecting members. ### Claim 20 A toner drum drive assembly comprising: a support portion defining an axis; and a drive projection extending axially from the support portion, the drive projection including three convex sidewalls each having a proximal end proximal to the axis and a distal end distal from the axis, three concave wall portions, each concave wall portion being adjacent to the proximal end of a respective one of the convex sidewalls, three generally semi-circular projecting members, each projecting member extending between a respective concave wall portion and the distal end of a respective sidewall, and three undercuts, each undercut positioned below a respective projecting member. ### Claim 21 (depends on 20) The toner drum drive assembly of claim 20, wherein each undercut extends between the concave wall portion and the distal end of the sidewall associated with the respective projecting member. ### Claim 22 (depends on 20) The toner drum drive assembly of claim 20, wherein the convex sidewalls have a larger radius than a radius of the concave wall portions. ### Claim 23 (depends on 20) The toner drum drive assembly of claim 20, wherein each projecting member and its respective concave wall portion and respective convex sidewall cooperate to define a radially outwardly and circumferentially extending arm portion. ### Claim 24 (depends on 23) The toner drum drive assembly of claim 23, wherein each projecting member defines a convex end portion of a respective arm portion. ### Claim 25 (depends on 20) The toner drum drive assembly of claim 20, wherein each concave wall portion provides a geometric transition between a generally circumferentially directed trajectory of the proximal end of a respective sidewall to a generally radially outwardly directed trajectory. ### Claim 26 (depends on 20) The toner drum drive assembly of claim 20, wherein the projecting members are generally semi-circular when viewed along the axis.