# US 8,787,800 B2 · Apparatus to receive a developer roller > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,787,800 B2 - Document ID: US8787800B2 - Status: Granted - Kind: B2 - Application number: 13/408,931 - Filed: 2012-02-29 - Published: 2013-08-29 - Granted: 2014-07-22 - Earliest claimed: 2012-02-29 - Assignees: Hewlett-Packard Development Company, L.P. - Applicants: Christopher S. Tanner; David Sabo; Eric G. Nelson - Inventors: Christopher S. Tanner; David Sabo; Eric G. Nelson - Web page: https://patentgrep.com/patent/US8787800B2 ## CPC - G03G 15/10: using a liquid developer - G03G 15/0896: {Arrangements or disposition of the complete developer unit or parts thereof not provided for by groups G03G15/08 - G03G15/0894} - G03G 21/1647: {Mechanical connection means} - G03G 2215/018: Linearly moving set of developing units, one at a time adjacent the recording member - G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY ## Abstract An apparatus to receive a developer roller for a printing device. The apparatus comprises a base assembly including end caps at opposing ends. The base assembly includes a receptacle for a developer roller having rotary bearings. Each end cap includes first and second datum pins and a clamp containing a spring member. Each clamp, when locked in place in part by action of the spring member, is to push against a corresponding rotary bearing when the developer roller is installed in the base assembly. The rotary bearing being forced by the clamp into contact with the first and second datum pins to position the developer roller in the base assembly. ## Claims ### Claim 1 An apparatus to receive a developer roller for a printing device, comprising: a base assembly including end caps at opposing ends of the base assembly, said base assembly includes a receptacle for a developer roller having a rotary bearing on opposing ends of the developer roller; each end cap including a first datum pin, a second datum pin, and a clamp containing a spring member; wherein each clamp, when locked in place in part by action of the spring member, is to push against a corresponding rotary bearing when the developer roller is installed in the base assembly, said rotary bearing being forced by the clamp into contact with the first and second datum pins to position the developer roller in the base assembly. ### Claim 2 (depends on 1) The apparatus of claim 1 wherein the first and second datum pins are positioned within each end cap so as to contact the rotary bearing at points approximately 120 degrees apart. ### Claim 3 (depends on 1) The apparatus of claim 1 wherein each clamp pivots along a rotational direction and each datum pin includes a long dimension that extends in a direction orthogonal to said rotational direction. ### Claim 4 (depends on 1) The apparatus of claim 1 wherein the clamp comprises a multi-hinged clamp. ### Claim 5 (depends on 1) The apparatus of claim 1 wherein the clamp comprises a bearing latch clamp rotationally connected to the end cap and rotationally connected to a handle, and the spring member connected to said handle. ### Claim 6 (depends on 1) The apparatus of claim 1 wherein the clamp comprises a substantially planar clamp surface that is to contact the rotary bearing when the clamp is forced into a locked position. ### Claim 7 (depends on 1) The apparatus of claim 1 wherein the spring member comprises a spring steel member that includes a hook to engage a retaining pin provided in the end cap. ### Claim 8 (depends on 1) The apparatus of claim 1 wherein the spring member is curved. ### Claim 9 A binary ink developing (BID) system, comprising: a base assembly; a developer roller to reside in the base assembly, said developer roller having a rotary bearing on opposing ends of the developer roller; each of multiple ends of the base assembly including a first datum pin, a second datum pin, and a clamp containing a spring member; wherein each clamp, when locked in place in part by action of the spring member, is to push against a corresponding rotary bearing when the developer roller is installed in the base assembly, said rotary bearing being forced by the clamp into contact with the first and second datum pins to position the developer roller in the base assembly. ### Claim 10 (depends on 9) The BID of claim 9 wherein the first and second datum pins are positioned within each end cap so as to contact the rotary bearing at points approximately 120 degrees apart. ### Claim 11 (depends on 9) The BID of claim 9 wherein each clamp pivots along a rotational direction and each datum pin includes a long dimension that extends in a direction orthogonal to said rotational direction. ### Claim 12 (depends on 9) The BID of claim 9 wherein the clamp comprises a multi-hinged clamp. ### Claim 13 (depends on 9) The BID of claim 9 wherein the clamp comprises a bearing latch clamp rotationally connected to the end cap and rotationally connected to a handle, and the spring member connected to said handle. ### Claim 14 (depends on 9) The BID of claim 9 wherein the clamp comprises a substantially planar clamp surface that is to contact the rotary bearing when the clamp is forced into a locked position. ### Claim 15 (depends on 9) The BID of claim 9 wherein the spring member comprises a spring steel member that includes a hook to engage a retaining pin provided in the end cap. ### Claim 16 A printing system, comprising: a photoconductor; and a BID assembly to cause liquid toner to be applied to said photoconductor; wherein the BID assembly comprises a base assembly including end caps at opposing ends of the base assembly, said base assembly includes a receptacle for a developer roller having a rotary bearing on opposing ends of the developer roller; each end cap including a first datum pin, a second datum pin, and a clamp containing a spring member; and wherein each clamp, when locked in place in part by action of the spring member, is to push against a corresponding rotary bearing when the developer roller is installed in the base assembly, said rotary bearing being forced by the clamp into contact with the first and second datum pins to position the developer roller in the base assembly. ### Claim 17 (depends on 16) The printing system of claim 16 wherein each clamp pivots along a rotational direction and each datum pin includes a long dimension that extends in a direction orthogonal to said rotational direction. ### Claim 18 (depends on 16) The printing system of claim 16 wherein the clamp comprises a bearing latch clamp rotationally connected to the end cap and rotationally connected to a handle, and the spring member connected to said handle. ### Claim 19 (depends on 16) The printing system of claim 16 wherein the clamp comprises a substantially planar clamp surface that is to contact the rotary bearing when the clamp is forced into a locked position. ### Claim 20 (depends on 16) The printing system of claim 16 wherein the spring member comprises a spring steel member that includes a hook to engage a retaining pin provided in the end cap.