# US 2013/0156478 A1 · Sheet conveying apparatus and image forming apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0156478 A1 - Document ID: US20130156478A1 - Status: Published application - Kind: A1 - Application number: 13/714,234 - Filed: 2012-12-13 - Published: 2013-06-20 - Earliest claimed: 2011-12-19 - Assignees: Canon Kabushiki Kaisha - Inventors: Kohei Deno - Web page: https://patentgrep.com/patent/US20130156478A1 ## CPC - G03G 15/6561: {for sheet registration} - G03G 15/6567: {for deskewing or aligning} - G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY ## Abstract A sheet conveying apparatus includes first and second conveyance roller pairs, a width-direction shifting unit, first and second drive units, and a control unit. The second conveyance roller pair is arranged downstream of the first conveyance roller pair to nip and convey the sheet conveyed by the first conveyance roller pair, and to bend the sheet. The width-direction shifting unit shifts the sheet nipped by the second conveyance roller pair in a width direction by shifting the second conveyance roller pair in the width direction. The control unit controls the first and second drive units so that a circumferential speed of the first conveyance roller pair is made higher than that of the second conveyance roller pair between when the second conveyance roller pair starts conveying the sheet and when the width-direction shifting unit completes shifting the second conveyance roller pair in the width direction. ## Claims ### Claim 1 A sheet conveying apparatus, comprising: a first conveyance roller pair configured to nip and convey a sheet; a second conveyance roller pair arranged downstream of the first conveyance roller pair and configured to nip and convey the sheet conveyed by the first conveyance roller pair, and to form a nip portion that comes into contact with a leading edge of the sheet conveyed by the first conveyance roller pair to bend the sheet; a width-direction shifting unit configured to shift the sheet nipped by the second conveyance roller pair in a width direction, perpendicular to a sheet conveyance direction, by shifting the second conveyance roller pair in the width direction; a first drive unit configured to rotate the first conveyance roller pair; a second drive unit configured to rotate the second conveyance roller pair; and a control unit configured to control the first and second drive units so that a circumferential speed of the first conveyance roller pair is made higher than that of the second conveyance roller pair between when the second conveyance roller pair starts conveying the sheet and when the width-direction shifting unit completes shifting the second conveyance roller pair in the width direction. ### Claim 2 (depends on 1) The sheet conveying apparatus according to claim 1, wherein the control unit sets a target circumferential speed of the first conveyance roller pair to be higher than that of the second conveyance roller pair. ### Claim 3 (depends on 1) The sheet conveying apparatus according to claim 1, wherein the control unit sets a circumferential acceleration of the first conveyance roller pair to be higher than that of the second conveyance roller pair. ### Claim 4 (depends on 1) The sheet conveying apparatus according to claim 1, wherein the control unit sets a circumferential speed of the first conveyance roller pair to be higher than that of the second conveyance roller pair between when the second conveyance roller pair starts conveying the sheet and when the width-direction shifting unit starts shifting the second conveyance roller pair in the width direction. ### Claim 5 (depends on 1) The sheet conveying apparatus according to claim 1, wherein the control unit determines circumferential speeds of the first and second conveyance roller pairs based on information at least about a conveyed sheet grammage or a conveyed sheet size. ### Claim 6 (depends on 1) The sheet conveying apparatus according to claim 1, wherein the control unit equalizes circumferential speeds of the first and second conveyance roller pairs after the width-direction shifting unit completes shifting the second conveyance roller pair in the width direction. ### Claim 7 (depends on 1) The sheet conveying apparatus according to claim 1, further comprising: a lower guide arranged upstream of the second conveyance roller pair and configured to guide the sheet conveyed by the first conveyance roller pair; and a swing guide arranged to face the lower guide, wherein, in response to the control unit controlling the first and second drive units to enlarge a loop formed by the sheet, the control unit swings the swing guide to expand a gap between the lower guide and the swing guide. ### Claim 8 (depends on 1) The sheet conveying apparatus according to claim 1, wherein the control unit conveys the sheet by rotating the first conveyance roller pair at a first circumferential speed, stops the sheet before a leading edge of the sheet comes into contact with the nip portion of the second conveyance roller pair, and causes the sheet to come into contact with the nip portion of the second conveyance roller pair by rotating the first conveyance roller pair at a second circumferential speed lower than the first conveyance speed. ### Claim 9 A sheet conveying apparatus, comprising: a first conveyance roller pair configured to nip and convey a sheet; a second conveyance roller pair arranged downstream of the first conveyance roller pair, and configured to nip and convey the sheet conveyed by the first conveyance roller pair, and to form a nip portion that comes into contact with a leading edge of the sheet conveyed by the first conveyance roller pair to bend the sheet; and a width-direction shifting unit configured to shift the sheet nipped by the second conveyance roller pair in a width direction, perpendicular to a sheet conveyance direction, by shifting the second conveyance roller pair in the width direction, wherein, between when the second conveyance roller pair starts conveying the sheet and when the width-direction shifting unit completes shifting the second conveyance roller pair in the width direction, an amount of a sheet bend formed between the first and second conveyance roller pairs is made greater than an amount of a sheet bend formed by causing the leading edge of the sheet conveyed by the first conveyance roller pair to come into contact with the nip portion of the second conveyance roller pair. ### Claim 10 (depends on 1) An image forming apparatus, comprising: the sheet conveying apparatus according to claim 1; and an image forming unit configured to form an image on a sheet whose skew and width-direction position are corrected by the sheet conveying apparatus.