Uneven gripper pressure leads to registration errors because it allows the sheet to "fish-tail" or shift as it is handed off between printing units. If the clamps on one side of the gripper bar hold more firmly than the other, the sheet will pull slightly to one side under the tension of the impression cylinder. This microscopic shift ruins the alignment between colors (e.g., Cyan and Magenta), resulting in a blurred or "out-of-register" image. This is particularly problematic in high-speed runs where centrifugal forces exacerbate any mechanical weakness.

To prevent this, regular maintenance of the Gripper pads and springs is essential to ensure uniform "bite" across the entire width of the sheet. From a pre-press perspective, ensuring that the Registration marks are placed within a safe distance from the gripper edge allows operators to monitor these shifts in real-time. Maintaining mechanical precision in the gripper system is the only way to achieve the tight tolerances required for high-quality commercial printing and complex packaging graphics.