Patent ID: 8205881
Filing Date: 2012-06-26
Classification: B41J

Abstract:
1. A sheet feeding device for intermittently feeding a sheet member on the basis of a commanded feeding amount comprised in each of successively generated feeding commands, said sheet feeding device comprising: a first feeding roller rotated by a first amount of rotation corresponding to the commanded feeding amount; a second feeding roller disposed downstream of the first feeding roller in a feeding direction of the sheet member and rotated by a second amount of rotation corresponding to the commanded feeding amount; an obtaining portion configured to obtain an overrun amount of the sheet member immediately after a trailing edge of the sheet member has left the first feeding roller, on the basis of a difference obtained by subtracting a first feeding amount, which is obtained from a product of a first radius and the first amount of rotation of the first feeding roller, from a second feeding amount, which is obtained from a product of a second radius and the second amount of rotation of the second feeding roller; an estimating portion configured to estimate whether the trailing edge of the sheet member leaves the first feeding roller during feeding of the sheet member according to a next one of the successively generated feeding command; and a subtracting portion configured to subtract the overrun amount of the sheet member obtained by the obtaining portion, from the next commanded feeding amount comprised in the next feeding command, when the estimating portion estimates that the trailing edge of the sheet member leaves the first feeding roller, wherein the estimating portion comprises: and wherein the estimating portion is configured to estimate that the trailing edge of the sheet member leaves the first feeding roller when the comparing portion determines that the remaining feeding amount is less than the next commanded feeding amount.