Patent ID: 8517371
Filing Date: 2013-08-27
Classification: B65H

Abstract:
1. A sheet feeding device, comprising: a first roller configured to feed a sheet in a first direction along a first feed path; a first motor configured to drive the first roller to rotate; a second roller arranged on a downstream side, in the first direction, of the first roller and configured to feed the sheet in the first direction along the first feed path; a second motor configured to drive the second roller to rotate; a sheet detection unit arranged, in the first feed path, between the first roller and the second roller, and configured to detect a leading end of the sheet fed in the first direction; a speed detection unit configured to detect a rotation speed of the first motor and a rotation speed of the second motor; a judging unit configured to judge whether the rotation speeds of the first motor and the second motor detected by the speed detection unit are equal to target rotation speeds of the first motor and the second motor, respectively; and a first compensation unit configured to set a second rotation amount by compensating a first rotation amount that is set preliminarily as a rotation amount of the second roller for feeding the sheet, from detection of the leading end of the sheet by the sheet detection unit, to arrival of the sheet at a predetermined position on the downstream side, in the first direction, of the second roller, based on the rotation speed of the first motor within a first period, which is a period from start of feeding of the sheet as the first roller is started to be driven to the detection of the leading end of the sheet by the sheet detection unit, on condition that the leading end of the sheet is detected by the sheet detection unit, if the judging unit judges that at least one of (a) the rotation speed of the first motor detected by the speed detection unit is not equal to the target rotation speed of the first motor and (b) the rotation speed of the second motor detected by the speed detection unit is not equal to the target rotation speed of the second motor; wherein, after setting the second rotation amount, the second motor drives the second roller based on the second rotation amount so as to feed the leading end of the sheet to the predetermined position.