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Focusing control of photohead in one printing plate exposure device

A technology of an exposure head and an exposure device, which is applied to the exposure device of the photo-engraving process, the preparation of the printing plate, the exposure equipment of the microlithography, etc., can solve the problems of high price and complicated structure, etc.

Inactive Publication Date: 2008-10-01
HEIDELBERGER DRUCKMASCHINEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this type of known device is complex in structure and expensive, especially when the printing plate is exposed simultaneously with many laser beams or with a plurality of exposure heads

Method used

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  • Focusing control of photohead in one printing plate exposure device
  • Focusing control of photohead in one printing plate exposure device
  • Focusing control of photohead in one printing plate exposure device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] Fig. 1 shows the principle structure of an outer cylinder exposure device. The exposure cylinder 1 is rotatably mounted and can be rotated uniformly in the direction of the rotation arrow 2 by means of a not shown rotary drive. An unexposed rectangular printing plate 3 is stretched on the exposure cylinder 1 . The printing plate 3 is stretched so tightly that its leading edge 4 contacts the positioning pin 8 which is firmly connected to the exposure cylinder 1 and protrudes through the surface of the exposure cylinder 1 . Furthermore, a clamping plate 9 firmly presses the leading edge 4 onto the surface of the exposure cylinder 1 and thereby fixes the leading edge 4 of the print 3 . Printing plate 3 is held on this cylinder surface with a vacuum device not shown in Fig. 2 in a large area, and this vacuum device sucks printing plate 3 by the hole on the cylinder surface, so printing plate is not peeled off by centrifugal force when rotating. Furthermore, the trailing e...

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PUM

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Abstract

A device sets the focus of at least one exposure head on a recording material, in particular a printing plate, in an exposer for recording printing originals. An exposer has an exposure drum for holding the printing plates, and an exposure-head carrier, which contains a carrier plate for holding exposure heads, and a carrier base. The carrier plate and the carrier base are connected such that they can move by a hinge which is disposed on the front side of the exposure-head carrier, facing the exposure drum. The rear of the carrier plate is raised or lowered by a tilting drive, as a result of which the exposure heads are moved jointly and substantially radially toward the exposure drum or away from the exposure drum. The hinge is preferably formed from at least one spring plate.

Description

technical field [0001] The invention relates to the technical field of electronic duplication and relates to a focus adjustment device of an exposure head of an exposure device used to record a printed manuscript sample on a printing plate. Background technique [0002] In reproduction technology, a printed copy is made for a printed page, which contains all the components to be printed such as text, diagrams and graphics. In the case of color printing, a separate printing sample is produced for each printing color, which contains all the components printed in the corresponding color. In four-color printing, the printing colors are cyan, magenta, yellow and black (CMYK). Printed manuscripts separated by printing colors can also be called color separations. Print proofs are typically scanned and exposed to film with an exposure unit, which is then used to make multiple printing plates. Alternatively, the printed proof can also be exposed directly on the printing plate in a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B41C1/05G03F7/00B41J2/44B41C1/10B41J2/45B41J2/455G03F7/20H04N1/036H04N1/06H04N1/29
CPCB41C1/1083
Inventor B·拉森D·I·尼特施B·帕施L·保罗森S·施密德特
Owner HEIDELBERGER DRUCKMASCHINEN AG