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US 6,604,739 B2Granted
Method and device for aligning flat copies in sheet-processing machines
AssigneeHeidelberger Druckmaschinen AG
InventorsPeter Förch, Andreas Henn
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AssigneeHeidelberger Druckmaschinen AG
InventorsPeter Förch, Andreas Henn
Estimating the term…
A method of aligning flat copies in a sheet-processing machine includes the steps of determining the actual position of a sheetlike material in relation to a coordinate system; implementing a nominal position of a cylinder that accommodates the sheetlike material to be aligned on the jacket surface of the cylinder by correctively controlling non-contacting radial/axial magnetic bearings so as to compensate for position changes of the cylinder or components thereof from the nominal position; and maintaining the cylinder in the nominal position thereof until the aligned sheet material is transferred to transport units arranged farther downline; a device for performing the method; a printing unit having the device; and a multicolor rotary printing machine having the device.
A method of aligning flat copies in a sheet-processing machine, which comprises the steps of determining the actual position of a sheetlike material in relation to a coordinate system;
A method of aligning cylinders carrying a printed image in a printing machine, which comprises the steps of determining the actual position of the printed image in relation to a coordinate system;
A device for aligning flat copies in sheet-processing machines wherein sheetlike material is conveyed by gripping devices on a circumferential surface of a driven cylinder, comprising radial/axial bearings for mounting the driven cylinder without contact therewith, the driven cylinder being accommodated in side walls and serving to carry the sheetlike material, and sensors assigned to said radial/axial bearings for detecting axial and radial position changes, respectively.
A device for aligning printed images in printing machines, wherein a printed image is carried by at least one cylinder selected from the group thereof consisting of printing form cylinders and transfer cylinders, comprising radial/axial bearings for mounting the cylinder without contact therewith, the cylinder being accommodated in side walls, and sensors assigned to said radial/axial bearings for detecting axial and radial position changes, respectively.
A printing unit having a device for aligning flat copies in sheet-processing machines wherein sheetlike material is conveyed by gripping devices on a circumferential surface of a driven cylinder, comprising radial/axial bearings for mounting the driven cylinder without contact therewith, the driven cylinder being accommodated in side walls and serving to carry the sheetlike material, and sensors assigned to said radial/axial bearings for detecting axial and radial position changes, respectively.
A multicolor rotary printing machine having a device for aligning flat copies in sheet-processing machines wherein sheetlike material is conveyed by gripping devices on a circumferential surface of a driven cylinder, comprising radial/axial bearings for mounting the driven cylinder without contact therewith, the driven cylinder being accommodated in side walls and serving to carry the sheetlike material, and sensors assigned to said radial/axial bearings for detecting axial and radial position changes, respectively.
Dependencies are inferred from the claim text.
From the US filing history. Foreign family members aren’t listed.
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Devices for conveying sheets through printing apparatus or machines: adjusting leading edges, e.g. front stops
Devices for conveying sheets through printing apparatus or machines: adjusting lateral edges, e.g. side stops
Registering, e.g. orientating, articles; Devices therefor: carried by article grippers
Registering, e.g. orientating, articles; Devices therefor: assisting by photoelectric, sonic, or pneumatic indicators
Term ended 9 Jan 2022 (estimated)
The invention relates to a method and a device for aligning flat copies in sheet-processing machines, such as multicolor rotary printing machines having a plurality of printing units arranged behind one another or in tandem.
The published German Patent Document DE 29 24 636 A1 is concerned with a control device for a sheet gripper device, wherein the sheet grippers are movable in axial direction. A number of sheet grippers for gripping the leading edge of a printed sheet between gripper fingers and gripper pads is provided, the gripper pads being fixed onto a gripper pad rail supporting the gripper spindle in bearings. The sheet grippers are arranged so as to be displaceable in the axial direction of the gripper spindle and of the gripper pad rail, for the purpose of aligning a printed sheet laterally, the gripper pad rail being fixed to the body of an impression cylinder and a transfer drum, respectively, or to the body of a pregripper by leaf-type spring supports which are deflectable in the axial direction of the gripper spindle and the gripper pad rail. The axial displacement of the gripper pad rail is performed by an actuating motor, which can be driven via a servo-controller circuit by light-sensitive elements which sense at least one edge of a printed sheet in relation to a locally fixed reference line.
With such a construction, lateral displacement of a sheet material in relation to the conveying direction thereof is possible, but the lateral alignment according to this construction must necessarily be subject to inaccuracies as a result of the play which is necessarily inherent therein due to the mechanical components.
FIG. 1 is a diagrammatic side elevational view shows a basic construction of a non-contact magnetic mounting of a cylinder for guiding sheetlike material;
FIG. 1′ is a fragmentary end view of FIG. 1 with a coordinate system;
FIG. 2 is a diagrammatic longitudinal sectional view of a drive configuration having a rotationally rigid drive shaft of a cylinder for conveying sheetlike material, the cylinder being accommodated in axial/radial bearings;
Referring now to the drawings and, first, particularly to FIG. 1 thereof, there is shown therein in a diagrammatic representation, a non-contact mounting of a cylinder accommodating sheet material on the jacket surface thereof.
FIG. 1′ shows a coordinate system 1 having a Y axis 4 running perpendicularly to the plane of the drawing of FIG. 1′. The coordinate system 1 further has an X axis 2, and finally a Z axis 3 extending parallel to the cylinder axis 10.
As shown in FIG. 1, a cylinder 7 conveying sheet material on the jacket surface 9 thereof has an axial directional sensor 5 assigned thereto, which is coaxial with the cylinder axis 10. Attached to the cylinder 7, respectively extending from the end faces 13 thereof, are cylinder journals 8 to which vertically oriented radial directional sensors 6 are fitted. The cylinder 7 guiding sheet material 29 has a closed jacket surface 9 wherein gripping devices, which are otherwise specifically illustrated in FIG. 1, are integrated.