Patent ID: 7458568
Filing Date: 2008-12-02
Classification: G03G,Y10T

Abstract:
1. A method for compensating gear backlash of a geared motor that can be operated in reverse operation in an electrophotographic printing machine, comprising the steps of: rotating the geared motor in a first direction of rotation until an end position is reached; rotating the geared motor in an opposite direction of rotation, said opposite direction of rotation being opposite to said first direction; acquiring a gear backlash at a point of reversal of the rotational motion by a sensor, said sensor producing a sensor output signal; calculating, using the sensor output, a time that elapses during a change of direction of rotation without change in the sensor output, said time indicating the gear backlash; and applying the time in the reverse operation for a correspondingly longer drive of the geared motor in order to compensate the gear backlash, said sensor is a Hall effect sensor that acquires the end position, and said rotating step in the opposite direction takes place until the Hall effect sensor signal decays.