# US 8,540,231 B2 · Paper stopper mechanism for paper-feeding apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,540,231 B2 - Document ID: US8540231B2 - Status: Granted - Kind: B2 - Application number: 13/485,031 - Filed: 2012-05-31 - Published: 2012-09-20 - Granted: 2013-09-24 - Earliest claimed: 2009-05-22 - Assignees: Kinpo Electronics, Inc. - Applicants: Liu Shi-Ze - Inventors: Liu Shi-Ze - Web page: https://patentgrep.com/patent/US8540231B2 ## CPC - B65H 3/06: Rollers or like rotary separators {(B65H3/42 takes precedence)} - B65H 3/0684: {on moving support, e.g. pivoting, for bringing the roller or like rotary separator into contact with the pile} - B65H 3/34: Article-retaining devices controlling the release of the articles to the separators - B65H 2402/54: Springs, e.g. helical or leaf springs - B65H 2403/42: Spur gearing - B65H 2403/73: Couplings - B65H 2801/06: Office-type machines, e.g. photocopiers - B65H 2801/39: Scanning - B65H: HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES ## Abstract A paper stopper mechanism for paper-feeding apparatus, which has simplified structure and commonly uses one motor to stop papers. The paper stopper mechanism includes a rotary shaft driven by a drive shaft via a gear assembly, a stopper plate disposed on the rotary shaft, which is movable between a first position and a second position along with the rotation of the rotary shaft, and a resilient member positioned between the rotary shaft and a transmission gear of the gear assembly. There is frictional force between the rotary shaft and the transmission gear, whereby the transmission gear can drive the rotary shaft to rotate. When the stopper plate and the rotary shaft stop at the second position, the transmission gear can still transmit power to a pickup roller to feed a paper into the paper-feeding apparatus without any error. ## Claims ### Claim 1 A paper stopper mechanism for a paper-feeding apparatus, comprising: a rotary shaft drivable by a transmission gear; a stopper plate disposed on the rotary shaft and movable between a first position and a second position along with the rotation of the rotary shaft; and a resilient member disposed between the rotary shaft and the transmission gear, the rotary shaft and the transmission gear frictionally interfering with the resilient member to provide a frictional force for the transmission gear to drive and rotate the rotary shaft, wherein the transmission gear is formed with a cavity for accommodating the resilient member, the cavity having an opening and a bottom section. ### Claim 2 (depends on 1) The paper stopper mechanism for a paper-feeding apparatus as claimed in claim 1, wherein the paper stopper mechanism is installed in an enclosure, the enclosure having a first stopper section and a second stopper section, which are disposed on an inner wall face of the enclosure. ### Claim 3 (depends on 1) The paper stopper mechanism for a paper-feeding apparatus as claimed in claim 1, wherein the transmission gear is drivable by a drive shaft. ### Claim 4 (depends on 3) The paper stopper mechanism for a paper-feeding apparatus as claimed in claim 3, wherein a drive gear is disposed on the drive shaft for driving the transmission gear. ### Claim 5 (depends on 4) The paper stopper mechanism for a paper-feeding apparatus as claimed in claim 4, wherein an idler is arranged between the drive gear and the transmission gear. ### Claim 6 (depends on 1) The paper stopper mechanism for a paper-feeding apparatus as claimed in claim 1, wherein the rotary shaft has a first insertion section (63) for insert-connecting with a second insertion section (64) of the stopper plate so as to fix the stopper plate on the rotary shaft. ### Claim 7 (depends on 6) The paper stopper mechanism for a paper-feeding apparatus as claimed in claim 6, wherein the insertion section (64) of the stopper plate is a claw-like structure, while the insertion section (63) of the rotary shaft is a rod-like structure, whereby the insertion section (64) of the stopper plate can grasp the insertion section (63) of the rotary shaft. ### Claim 8 (depends on 1) The paper stopper mechanism for a paper-feeding apparatus as claimed in claim 1, wherein the resilient member is a coiled spring having a first side (51) and a second side (52), the rotary shaft and the transmission gear respectively pressing against the first and second sides of the resilient member to frictionally interfere with the resilient member. ### Claim 9 (depends on 1) The paper stopper mechanism for a paper-feeding apparatus as claimed in claim 1, wherein the rotary shaft has a restriction section, a free end and a stopper section. ### Claim 10 (depends on 9) The paper stopper mechanism for a paper-feeding apparatus as claimed in claim 9, wherein the resilient member is fitted on the free end of the rotary shaft and confined between the restriction section and the transmission gear. ### Claim 11 (depends on 9) The paper stopper mechanism for a paper-feeding apparatus as claimed in claim 9, wherein the stopper section is movable between the first stopper section and the second stopper section. ### Claim 12 (depends on 1) The paper stopper mechanism for a paper-feeding apparatus as claimed in claim 1, wherein the transmission gear is a solid structure having a plane face for pressing against one side of the resilient member. ### Claim 13 (depends on 1) The paper stopper mechanism for a paper-feeding apparatus as claimed in claim 1, wherein the paper stopper mechanism and the paper-feeding apparatus are installed in the enclosure. ### Claim 14 (depends on 1) The paper stopper mechanism for a paper-feeding apparatus as claimed in claim 1, wherein the transmission gear serves to drive a driven gear. ### Claim 15 (depends on 14) The paper stopper mechanism for a paper-feeding apparatus as claimed in claim 14, wherein an idler is arranged between the transmission gear and the driven gear. ### Claim 16 A paper stopper mechanism for a paper-feeding apparatus, comprising: a rotary shaft drivable by a transmission gear; a stopper plate disposed on the rotary shaft and movable between a first position and a second position along with the rotation of the rotary shaft; and a resilient member disposed between the rotary shaft and the transmission gear, the rotary shaft and the transmission gear frictionally interfering with the resilient member to provide a frictional force for the transmission gear to drive and rotate the rotary shaft, wherein the transmission gear serves to drive a driven gear, wherein an idler is arranged between the transmission gear and the driven gear, wherein the rotary shaft has a first insertion section (63) for insert-connecting with a second insertion section (64) of the stopper plate so as to fix the stopper plate on the rotary shaft. ### Claim 17 (depends on 16) The paper stopper mechanism for a paper-feeding apparatus as claimed in claim 16, wherein the paper stopper mechanism is installed in an enclosure, the enclosure having a first stopper section and a second stopper section, which are disposed on an inner wall face of the enclosure. ### Claim 18 (depends on 16) The paper stopper mechanism for a paper-feeding apparatus as claimed in claim 16, wherein the transmission gear is drivable by a drive shaft. ### Claim 19 (depends on 18) The paper stopper mechanism for a paper-feeding apparatus as claimed in claim 18, wherein a drive gear is disposed on the drive shaft for driving the transmission gear. ### Claim 20 (depends on 19) The paper stopper mechanism for a paper-feeding apparatus as claimed in claim 19, wherein the transmission gear serves to drive a driven gear. ### Claim 21 (depends on 16) The paper stopper mechanism for a paper-feeding apparatus as claimed in claim 16, wherein the transmission gear is formed with a cavity for accommodating the resilient member, the cavity having an opening and a bottom section. ### Claim 22 (depends on 16) The paper stopper mechanism for a paper-feeding apparatus as claimed in claim 16, wherein the insertion section (64) of the stopper plate is a claw-like structure, while the insertion section (63) of the rotary shaft is a rod-like structure, whereby the insertion section (64) of the stopper plate can grasp the insertion section (63) of the rotary shaft. ### Claim 23 (depends on 16) The paper stopper mechanism for a paper-feeding apparatus as claimed in claim 16, wherein the resilient member is a coiled spring having a first side (51) and a second side (52), the rotary shaft and the transmission gear respectively pressing against the first and second sides of the resilient member to frictionally interfere with the resilient member. ### Claim 24 (depends on 16) The paper stopper mechanism for a paper-feeding apparatus as claimed in claim 16, wherein the rotary shaft has a restriction section, a free end and a stopper section. ### Claim 25 (depends on 24) The paper stopper mechanism for a paper-feeding apparatus as claimed in claim 24, wherein the resilient member is fitted on the free end of the rotary shaft and confined between the restriction section and the transmission gear. ### Claim 26 (depends on 24) The paper stopper mechanism for a paper-feeding apparatus as claimed in claim 24, wherein the stopper section is movable between a first stopper section and a second stopper section. ### Claim 27 (depends on 16) The paper stopper mechanism for a paper-feeding apparatus as claimed in claim 16, wherein the transmission gear is a solid structure having a plane face for pressing against one side of the resilient member. ### Claim 28 (depends on 16) The paper stopper mechanism for a paper-feeding apparatus as claimed in claim 16, wherein the paper stopper mechanism and the paper-feeding apparatus are installed in an enclosure.