Importance

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Abstract

A guide blade for guiding sheets in a printing machine in in-line or perfecting mode processes employing trailing edge turning, the guide blade has a front edge and an end piece, and air nozzels located in a flow surface extending from the front edge along the end piece. The air nozzels are connected to a source of pressurized gas, and direct pressurized gas in the direction of travel of the sheets. A plurality of parallel, spaced-apart, guiding fins project downwardly from the flow surface. The guiding fins have downstream ends which are spaced further away from the flow surface than the upstream ends thereof. The sheet, along with the guiding fins and the flow surface, create a diverging flow channel below the end piece of the guide blade, inducing a partial vacuum in the flow channel, which maintains the sheet in contact with said guide blade. The guide fins include air nozzels and the angle between the guiding fins and the flow surface can be adjusted. Further, using a thread bolt, the lateral width covered by the guide blades can be adjusted to accomodate various width sheets.

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First Claim