Pivotable Guide Element for Printing Plate Feeding

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Solution Overview

Problem

Existing devices for feeding printing plates to a plate cylinder in printing presses often cause scratching of the image side due to non-removable components, which can damage the plates during the wrapping process.

Innovation Solution

A device featuring a pivotable guide element with transport rollers and a plate bending roller, where the roller in contact with the image side is removable once the leading edge is clamped, and a plate bending roller that addresses bends in used plates, ensuring safe and scratch-free feeding.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If non-removable components are used in the feeding device, then the structure is simpler and more stable, but the image side of the printing plate is scratched during the wrapping process

Engineering Contradiction:

Improvescratching of the image sideVSAvoidcomplexity of the feeding device structure

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The feeding device is divided into two main segments: a stationary guide element and a pivotable arm carrying the transport roller and plate bending roller. This segmentation allows the image-contacting components to be separated from the fixed structure, enabling them to be moved away after feeding to prevent scratching of the printed image.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The transport roller and plate bending roller are mounted on a pivotable arm that can rotate between a feeding position (where they contact the plate) and a retracted position (where they clear the plate after feeding). This dynamic positioning eliminates scratching while maintaining feeding functionality.

Inventive Principle:

Principle #15Dynamics

2Manufacturing precision

If the plate bending roller acts on the bend in the used printing plate, then the feeding accuracy is improved, but the device requires precise spacing control

Engineering Contradiction:

Improvefeeding accuracy of the printing plateVSAvoidprecision control of roller spacing

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The plate bending roller is positioned to act on the bend in the used printing plate before the plate enters the clamping device. This preliminary action straightens the plate, ensuring accurate feeding and positioning without requiring complex real-time adjustment mechanisms.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The plate bending roller utilizes the existing bend in the used printing plate as its target, automatically adapting to the plate's condition without requiring sensors or active control systems. The roller's fixed positioning relative to the guide element provides the necessary precision through mechanical design rather than active control.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS8607701B2Device for feeding printing plates to a plate cylinder of a printing press and sheet-fed rotary printing press having the device

Publication Date: 2013.12.17 HEIDELBERGER DRUCKMASCHINEN AG

AI summary

A device for feeding printing plates to a plate cylinder in a printing press includes a pivotable guide element. The pivotable guide element has pivotable guide members which are in contact with an image side of the printing plate when the printing plate is being fed to the plate cylinder. These pivotable guide members are disposed in such a way that they can be disengaged from the printing plate when the printing plate is being wrapped around the plate cylinder. A sheet-fed rotary printing press having the device, is also provided.