Patent ID: 8063591

Claim:
A motor driving device for controlling a driving state of a motor of a driven device having a driven member and a clutch, said clutch including a first member configured to move when applied with a driving force in a first direction or a second direction opposite to said first direction generated by said motor, a second member which transmits said driving force to said driven member while said first member engages with said second member, said clutch being configured such that a first time period elapses from a time at which said driving force in said first direction is applied to said first member located at an initial position thereof to a time at which said first member engages with said second member, said motor driving device comprising: a first function of supplying power to said motor so that said motor generates said driving force; a second function of detecting a current flowing through said motor supplied with power by said first function; a third function of performing a power supply control in order that a value of said current detected by said second function is maintained within a target range; a fourth function of performing a first power supply operation in which said motor is supplied with power for a second time period shorter than said first time period such that said motor generates said driving force in said first direction before said third function performs said power supply control; and a fifth function of making a judgment on a state of each of said first to third functions on the basis of said value of said current detected by said second function during said second time period.