# US 2013/0153370 A1 · Driven roller unit and paper feeding device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0153370 A1 - Document ID: US20130153370A1 - Status: Published application - Kind: A1 - Application number: 13/525,364 - Filed: 2012-06-18 - Published: 2013-06-20 - Earliest claimed: 2011-12-16 - Assignees: Kinpo Electronics, Inc.; Cal-Comp Electronics & Communications Company Limited - Inventors: Chih-Hwa Wang - Web page: https://patentgrep.com/patent/US20130153370A1 ## CPC - B65H 5/062: {between rollers or balls} - B65H 2402/20: Force systems, e.g. composition of forces - B65H 2402/51: Joints, e.g. riveted or magnetic joints - B65H 2404/1431: idler roller details - B65H: HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES ## Abstract A driven roller unit and a paper feeding device are provided. The paper feeding device includes a frame, the driven roller unit and a driving roller. The frame has a dome concave. The driven roller unit has an omnidirectional ball, wherein the omnidirectional ball is in the dome concave. The driving roller is disposed above the frame and the driven roller unit. When the driving roller presses on the driven roller unit, an angle included by the driving roller and the driven roller unit is adjusted due to the rotation of the omnidirectional ball relative to the dome concave, and therefore the force applied on the driven roller unit is uniform. ## Claims ### Claim 1 A driven roller unit having an omnidirectional ball, wherein when the driven roller unit is pressed the omnidirectional ball rotates so as to balance a force acting on the driven roller unit. ### Claim 2 (depends on 1) The driven roller unit as claimed in claim 1, comprising: a fixing support, wherein the omnidirectional ball is disposed below the fixing support; and a driven roller disposed on the fixing support. ### Claim 3 (depends on 2) The driven roller unit as claimed in claim 2, wherein the fixing support further has a pair of sidewalls and a base connected between the pair of sidewalls, and the omnidirectional ball is connected to a bottom of the base. ### Claim 4 (depends on 3) The driven roller unit as claimed in claim 3, wherein the driven roller has an assembling shaft passing through the pair of sidewalls of the fixing support. ### Claim 5 (depends on 4) The driven roller unit as claimed in claim 4, wherein each of the sidewalls has an assembling structure, and the assembling shaft passes through the assembling structures. ### Claim 6 (depends on 5) The driven roller unit as claimed in claim 5, wherein the assembling structures are openings disposed on the sidewalls along an altitudinal direction thereof. ### Claim 7 (depends on 6) The driven roller unit as claimed in claim 6, further comprising a pair of elastomers disposed within the openings. ### Claim 8 (depends on 3) The driven roller unit as claimed in claim 3, wherein each of the sidewalls has at least one hollow portion, so as to form an elastic structure. ### Claim 9 (depends on 1) The driven roller unit as claimed in claim 1, wherein the driven roller has an assembling shaft passing through the fixing support. ### Claim 10 A paper feeding device, comprising: a frame having a dome concave; a driven roller unit having an omnidirectional ball, wherein the omnidirectional ball is located in the dome concave; and an driving roller disposed above the driven roller unit and the frame and adapted to exert a force on the driven roller unit. ### Claim 11 (depends on 10) The paper feeding device as claimed in claim 10, wherein the driven roller unit comprises: a fixing support disposed in the frame, wherein the omnidirectional ball is disposed below the fixing support; and a driven roller disposed on the fixing support. ### Claim 12 (depends on 11) The paper feeding device as claimed in claim 11, wherein the frame further has a recess, and the dome concave is disposed in the recess. ### Claim 13 (depends on 11) The paper feeding device as claimed in claim 11, wherein the fixing support further has a pair of sidewalls and a base connected between the pair of sidewalls, and the omnidirectional ball is connected to a bottom of the base. ### Claim 14 (depends on 13) The paper feeding device as claimed in claim 13, wherein the driven roller has an assembling shaft passing through the pair of sidewalls of the fixing support. ### Claim 15 (depends on 14) The paper feeding device as claimed in claim 14, wherein each of the sidewalls has an assembling structure, and the assembling shaft passes through the assembling structures. ### Claim 16 (depends on 15) The paper feeding device as claimed in claim 15, wherein the assembling structures are openings disposed on the sidewalls along an altitudinal direction thereof. ### Claim 17 (depends on 16) The paper feeding device as claimed in claim 16, further comprising a pair of elastomers disposed within the openings. ### Claim 18 (depends on 13) The paper feeding device as claimed in claim 13, wherein each of the sidewalls has at least one hollow portion, so as to form an elastic structure. ### Claim 19 (depends on 10) The paper feeding device as claimed in claim 10, wherein the driven roller has an assembling shaft passing through the fixing support.