Method and device for the alignment of a sheet
AssigneeEastman Kodak Company
InventorVolker Otto
Life of this patent
Estimating the term…
Abstract
The invention relates to a method for the alignment of a sheet in a direction transverse (cross-track) to its transport direction in a sheet-printing machine, in particular in a digital printing machine, preferably in an electrographically operating printing machine. The object of the invention is to improve, in a simple manner, a method and a device of the aforementioned generic types in view of a first rough alignment of the individual sheet. Referring to the method, this object is achieved in accordance with the invention in that the individual sheet is flipped about a preferably non-physical, mathematical or imagined flipping axis extending in transport direction, and that this flipping produces a transverse offset of the sheet in transverse direction.
Claims6
Method for the alignment of a sheet in a direction transverse to its transport direction in a sheet-printing machine, comprising:
- receiving the sheet with a central axis of the sheet aligned with the transport direction;
- moving the sheet along the transport direction;
- wherein the sheet is flipped about a flipping axis transversely offset and substantially parallel to the transport direction, and this flipping produces a determined transverse offset of the sheet-in the transverse direction.
Device for the alignment of a sheet in a direction transverse (cross-track) to its transport direction in a sheet-printing machine comprising:
- flipping webs approximately extending in transport direction and grasping and clamping between them the sheet by its two surfaces, said flipping webs being guided in a crossed and rotated manner such that they flip the sheet during its transport about a flipping axis;
- spacers inserted to offset the flipping axis of the flipping device in relation to a central axis of the sheet moving in a transport direction into the flipping device, and
- wherein the spacers offset the flipping axis from the central axis by one half of a determined offset distance.
Dependencies are inferred from the claim text.