| 摘要 |
A printing machine ( 10 ) including a registration station ( 45 ) for applying a skew adjustment received from a human operator is disclosed. The registration station ( 45 ) includes independently controllable motors ( 52 a, 52 b) that drive corresponding urging rollers ( 56 a, 56 b) as controlled by control circuitry ( 24 ), for example in response to the position of a media sheet as sensed by sensors ( 58 a, 58 b; 60 a, 60 b) at the registration station ( 45 ). The machine operator can enter a skew adjustment value at a user interface ( 25 a), or at a networked computer workstation with which the printing machine ( 10 ) communicates via a network interface ( 25 b). The control circuitry ( 24 ) calculates differential control signals for controlling the motors ( 52 a, 52 b) to effect the skew correction. The differential control signals may be differential timing delays, such as prior to deactivation of the motors ( 52 a, 52 b), or may be a differential velocity signal for driving the motors ( 52 a, 52 b).
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