Shingled Sheet Transport via Air-Blown Edge Raising
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Solution Overview
Problem
Current methods for arranging sheets in a shingled layer, particularly in hybrid sheetfed machine arrangements for packaging production, face challenges in achieving high productivity and register accuracy, especially when using non-impact printing devices and varying sheet formats.
Innovation Solution
A method and device for arranging sheets in a shingled layer using a linear transport system with suction belt conveyors, which allows for optimal working speeds of both conventional and non-impact printing devices, ensuring high register accuracy and flexible production of packaging materials by adjusting the transport speed and distance between sheets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If sheets are transported individually one after the other, then register accuracy is improved, but productivity decreases due to the need to wait for each sheet to be processed sequentially
Solution Approach 1:
The patent transitions from sequential single-sheet transport to multi-sheet overlapping transport. Multiple sheets are arranged in a shingled configuration where they overlap partially, allowing multiple sheets to be processed simultaneously in different stages along the transport path, thus adding a dimensional aspect to the transport system.
Solution Approach 2:
Sheets are pre-positioned in an overlapping shingled arrangement before entering the processing station. This preliminary positioning ensures that when sheets are fed through the processing station, they are already aligned correctly, maintaining register accuracy while enabling continuous flow processing.
2Productivity
If sheets are arranged in a shingled layer with overlapping, then productivity is improved by processing multiple sheets simultaneously, but manufacturing precision deteriorates due to difficulty in maintaining register accuracy
Solution Approach 1:
A transport device with multiple transport elements acts as an intermediary between the sheet feeding mechanism and the processing station. This intermediary device precisely controls the position and movement of each sheet in the shingled arrangement, ensuring that overlapping sheets maintain correct register alignment throughout the processing operation.
Solution Approach 2:
The transport system employs dynamic speed control where different portions of the transport path or different transport elements move at different speeds. This allows sheets in the shingled arrangement to be fed, processed, and discharged at optimized speeds while maintaining precise relative positioning and register accuracy.
3Productivity
If transport speed is increased to improve productivity, then production efficiency is improved, but manufacturing precision deteriorates due to difficulty in maintaining register accuracy at higher speeds
Solution Approach 1:
The transport system employs dynamic speed control where different portions of the transport path or different transport elements move at different speeds. This allows sheets in the shingled arrangement to be fed, processed, and discharged at optimized speeds while maintaining precise relative positioning and register accuracy.
Solution Approach 2:
The system incorporates feedback mechanisms that monitor the position and movement of sheets during transport. This feedback information is used to make real-time adjustments to transport speed and positioning, ensuring that register accuracy is maintained even at higher production speeds.
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 approach enables flexible and economical production of packaging materials by maintaining high register accuracy and productivity, even with varying sheet formats, by optimizing the transport speed and distance between sheets, and allows for the use of both conventional and non-impact printing devices in a hybrid machine arrangement.
Implementation Method 1
a suction belt conveyor (52; 78) for holding and for transporting the respective sheet (51) along a transport path (29)
Implementation Method 2
a device (132) for raising the rear edge (51b) of the preceding sheet (51) using blown air
Data Source
Figure 1
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AI summary
The invention relates to a method and a device for arranging sheets in an overlapping position in a transfer unit arranged between a first processing station (01; 02; 03; 04; 06; 07; 08; 09; 11; 12) and a second processing station (01; 02; 03; 04; 06; 07; 08; 09; 11; 12) following the first processing station (01; 02; 03; 04; 06; 07; 08; 09; 11; 12) in the transport direction (T) of the sheets, wherein the sheets to be overlapped are transported from the first processing station (01; 02; 03; 04; 06; 07; 08; 09; 11; 12) to the transfer unit, in a transport plane (29) and each individually lying behind one another, wherein a respective rear - in the transport direction (T) - edge of the sheets coming from the first processing station (01; 02; 03; 04; 06; 07; 08; 09; 11; 12) is raised relative to the transport plane (29) exclusively by means of blown air, and a subsequent sheet is slid under the rear edge of the respective preceding sheet.