Patent ID: 8839718

Claim:
A method of error correction in a printing system, said method comprising: engaging a sheet of print media with a rotating perfector arm, wherein said perfector arm is rotated by a belt which is driven by a motor; detecting a relative position of said perfector arm with respect to said sheet of print media when said perfector arm has engaged said sheet of print media, said detecting being performed using a homing sensor that is configured to sense said perfector arm while said perfector arm is engaged with said sheet of print media; comparing said relative position of said perfector arm, as indicated by said homing sensor, with an expected relative position between said perfector arm and said sheet of print media, said expected relative position being determined by an encoder which is encoding a position of said motor, a difference between said relative position and said expected relative position of said perfector arm being attributable to said belt; and when feeding said sheet of print media with said perfector arm to a print engine, compensating for any difference between said relative position and said expected relative position by adjusting a position of said motor.