Patent ID: 7971878

Claim:
A sheet conveying device, comprising: a first sheet conveying unit that is located upstream in a sheet conveying direction and that includes a first driving roller and a first driven roller; a driving source for driving the first driving roller; a second sheet conveying unit that is located downstream in the sheet conveying direction, that includes a second driving roller and a second driven roller, and of which a driving torque is controllable; a torque estimation unit that, based upon a driving current of the driving source and a first load torque generated at a time that a sheet-like member passes through a first nip between the first driving roller and the first driven roller estimates a second load torque generated at a time that the sheet-like member passes through a second nip between the second driving roller and the second driven roller; and a control unit that controls the driving torque such that the second load torque is counterbalanced by applying a counterbalancing torque in synchronization with a timing of entry of the sheet-like member into the second nip, wherein the torque estimation unit estimates the second load torque taking into account a torque constant of the driving source and a reduction ratio from the driving source to the first driving roller.