System for turning a sheet in a printing machine

Details System for turning a sheet in a printing machine System for turning a sheet in a printing machine

1999-03-25

2000-07-18

Eickholt, Eugene

Printing

Multicolor

Rotary machines

101230, B41S 502

Patent

active

060891556

ABSTRACT:
The invention relates to a method and apparatus turning a sheet in a printing machine. More specifically, a swing arm is provided to grip a trailing edge of a sheet delivered on a first cylinder and transfer the gripped edge to a second cylinder. The invention provides low-outlay sheet-turning apparatus which provides smear-free sheet transportation. In conjunction with the swing arm, the second cylinder has secant-like flattened sections, or a non-circular cross-section, forming clearance areas within an outer circumference of the second cylinder as defined by a rotary path of radially outward portions of the second cylinder. In face-and-reverse printing mode, these clearances enable the swing arm to synchronously travel a sheet-feed path which intersects the circumference of the second cylinder. With this motion the swing arm draws the sheet from the first cylinder in a substantially tangential manner, avoiding dramatic curving of the sheet. The swing arm deposits the transferred edge of the sheet to a gripper on the second cylinder, which carries the sheet to a downstream cylinder. When the sheet is transferred onto the downstream cylinder, it is "turned over" relative to its initial orientation. In a face printing mode, the swing arm can be fixed in a position near the second cylinder, the swing arm having openings which deliver a flow of air against the sheet to assist in guiding the sheet onto the second cylinder.

REFERENCES:
patent: 4014261 (1977-03-01), Becker
patent: 4869166 (1989-09-01), Mathers
patent: 5579691 (1996-12-01), Voge
patent: 5598779 (1997-02-01), Haas et al.
patent: 5609103 (1997-03-01), Stephan
patent: 5762333 (1998-06-01), Sugiyama et al.

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