Patent ID: 7236202

Claim:
A movement control system for an apparatus comprising a movable member movable between two different positions, a power generator for generating power for moving the movable member, and a sensor device for producing an output value changeable while the movable member moves between the two positions, the movement control system being operable to control the movement of the movable member between one of the two positions and the other position, the control system being operable to drive the power generator in a first amount enabling the movable member to reach the other position so as to move the movable member from said one position toward said other position, the control system being thereafter operable to drive the power generator in a second amount enabling the movable member to reach said one position when the output value of the sensor device remains unchanged, so as to move the movable member toward said one position, the control system being operable to drive the power generator in a third amount not enabling the movable member to reach said one position when the sensor device produces a changed output value, so as to move the movable member toward said one position, the control system being operable to drive the power generator in a fourth amount enabling the movable member to reach said other position after the power generator is driven in the third amount, when the output value of the sensor device is different from the output value before the power generator is driven in the first amount, so as to move the movable member toward said other position, the control system being operable to drive the power generator in the second amount when the output value of the sensor device is the same as the output value before the power generator is driven in the first amount, so as to move the movable member toward said one position.