Integrated Deionization in Sheet Guide Elements for Stable Conveyance
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Solution Overview
Problem
Existing sheet-processing machines, particularly at high speeds, face issues with electrostatic charging of sheets leading to attraction to guide plates, smearing, and unstable sheet guidance, especially in turning devices, which are not effectively addressed by current deionization methods.
Innovation Solution
The implementation of discharge electrodes in sheet guide elements, such as guide plates, with optimal electrode spacing and pneumatic assistance, ensures effective deionization and stable sheet guidance, particularly in turning devices, by maintaining a distance from machine parts and using controlled ion emission to neutralize electrostatic charges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If deionization bars are arranged upstream of printing cylinders to neutralize sheets, then electrostatic charging is reduced, but the device complexity increases and adhesion to cylinders increases
Solution Approach 1:
The patent extracts the deionization function from separate bars and integrates it directly into the sheet guide element (guide plate), combining guidance and charge neutralization in a single component. This reduces device complexity while maintaining deionization effectiveness.
Solution Approach 2:
The patent merges the sheet guidance function and deionization function into a single integrated sheet guide element. The guide plate contains embedded discharge electrodes that simultaneously guide sheets and neutralize electrostatic charges, eliminating the need for separate deionization bars.
2Ease of operation
If discharge device is arranged in the edge close to printing cylinder, then sheet guidance is improved, but effectiveness is reduced due to difficulty in maintaining optimal electrode spacing
Solution Approach 1:
The patent positions the discharge electrodes within the sheet guide element upstream of the printing cylinder, performing deionization before the sheet enters the printing zone. This preliminary action ensures optimal electrode spacing is maintained and electrostatic charges are neutralized before they cause adhesion problems.
3Strength
If non-conductive edge material is used for sheet guiding, then electrical insulation is provided, but wear increases and stability weaknesses occur in crash areas
Solution Approach 1:
The patent uses a composite structure where the sheet guide element body is made of wear-resistant material (such as metal) while containing embedded discharge electrodes for deionization. This composite approach provides both mechanical durability and electrical insulation through the integrated design, eliminating the need for non-conductive edge materials that wear quickly.
4Force
If flat charging electrode is applied to guide surface to attract sheets, then sheet attraction is improved, but stable suspension height cannot be maintained and nozzle distribution is interfered with
Solution Approach 1:
The patent segments the charging function into discrete discharge electrodes embedded in the sheet guide element, rather than using a flat charging electrode across the entire guide surface. This segmentation allows controlled ion emission at specific locations without interfering with nozzle distribution and enables stable sheet suspension through localized electrostatic control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution significantly improves sheet guidance, preventing smearing and wrinkles, ensuring smooth conveyance through processing stations, even with low-grammage or film sheets, and supports machines handling foil sheets without mechanical contact or smearing.
Implementation Method 1
using controlled ion emission to neutralize electrostatic charges
Implementation Method 2
discharge electrodes in sheet guide elements... ensures effective deionization
Implementation Method 3
pneumatic assistance, ensures effective deionization and stable sheet guidance
Data Source
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AI summary
The invention relates to a sheet-processing machine (1) with sheet-processing units, wherein the machine (1) includes at least two printing units (2) for processing sheets, wherein the printing units (2) each include a rubber cylinder (6) and a plate cylinder, and a rubber cylinder (6) of a printing unit (2) interacts with a sheet guide cylinder (5), wherein a sheet conveying system (7) is provided between two sheet guide cylinders (5), wherein the sheets are conveyed along a sheet conveying path by the sheet guide cylinders (5) and the sheet conveying systems (7) of the machine (1), wherein a sheet guide element starting in the area of the sheet guide cylinder (5) is provided below and along the sheet conveying path in one or all printing units (2), and wherein deionization devices (8) are provided at least in the printing units (2) of the machine (1).which are downstream of the printing gap of the first printing unit (2) of the machine (1) with respect to the sheet feed direction (BFR). The invention also relates to a use of the sheet-processing machine, a method for conveying sheets in a sheet-processing machine (1), and a use of sheet guide elements (9) containing deionization devices (8).