Adjustable Shingling Unit for Precise Sheet Stream Transfer
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Solution Overview
Problem
Existing roll cross-cutter systems face complexity in format changes, leading to unfavorable operating states, such as stopping the cross-cutting device in an unfavorable position, which results in material stress, energy inefficiency, and potential arch slipping, due to the need for precise adjustments in speed and distance between the brake and shed devices to maintain accurate arch formation and transfer.
Innovation Solution
The scalch device is adjusted based on the current arch length relative to the braking device, allowing for constant transfer length and speed, even during format changes, thereby simplifying setup and reducing material stress and energy consumption by using the arch length as a buffer to maintain phase synchronization between the transport tapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the distance between the braking device and the shingling unit is adjusted to maintain precise arch formation, then the manufacturing precision of the shingle stream is improved, but the device complexity increases due to multiple adjustment requirements
Solution Approach 1:
The patent combines the shingling unit and braking device into a single integrated module that moves together as one unit. This merging eliminates the need for separate adjustment mechanisms for the distance between these two components, reducing device complexity while maintaining the precision required for proper arch formation. The modular design allows the entire assembly to be positioned relative to other fixed components rather than requiring independent adjustment of multiple distances.
Solution Approach 2:
The integrated module serves multiple functions simultaneously: the shingling unit creates the arch formation while the braking device controls the speed of the arches. By combining these functions into one movable unit, the system achieves multi-functionality without requiring separate adjustment mechanisms for each function, thereby reducing overall device complexity while maintaining manufacturing precision.
2Reliability
If the speed of transport tapes is adjusted to maintain phase synchronization, then the reliability of arch delivery is improved, but the use of energy increases due to continuous speed control
Solution Approach 1:
The system establishes the correct phase relationship between transport tapes in advance through the mechanical coupling of the integrated module. Once the module is positioned correctly relative to the fixed components, the phase synchronization is maintained mechanically without requiring continuous active speed control. This preliminary positioning action reduces the need for ongoing energy-intensive speed adjustments while maintaining reliable arch delivery.
Solution Approach 2:
The patent creates a mechanically coupled system where the shingling unit and braking device move together at the same speed, establishing an equipotential relationship between these components. This mechanical synchronization eliminates the need for active speed control systems that would consume additional energy, while still maintaining the phase relationship necessary for reliable arch formation and delivery.
3Productivity
If the braking gap is optimized for efficient arch braking, then the productivity of the system is improved, but the manufacturing precision of arch positioning deteriorates due to potential arch slipping
Solution Approach 1:
The patent employs dynamic speed control of the braking device within the integrated module, allowing the braking force to be adjusted in real-time. This dynamic adjustment enables the system to optimize the braking gap for high productivity while simultaneously maintaining precise arch positioning by adapting the braking force to prevent slipping. The dynamic capability allows the system to respond to varying conditions and maintain both efficiency and precision.
Solution Approach 2:
The system incorporates feedback control to monitor arch positioning and braking effectiveness. Based on this feedback, the speed of the braking device is automatically adjusted to maintain optimal braking conditions. This feedback mechanism allows the system to achieve high productivity through efficient braking while preventing arch slipping that would compromise positioning accuracy, thus resolving the contradiction between throughput and precision.
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 ensures consistent delivery of arches at the correct speed and position, preventing arch slipping and material damage, allowing for efficient system stops and starts with reduced wear and energy use, while maintaining phase synchronization between transport tapes.
Implementation Method 1
The sheets passing through the shingle unit are lifted at a defined point on the sheets, specifically at their trailing edge, by the lifting shaft relative to the transport plane and pressed against the suction belt located above. The suction belt rotates at a lower speed than the high-speed conveyor belts that transport the sheets from the cross-cutting unit. This slows the sheet down.
Implementation Method 2
A braking device is arranged downstream of the shingling unit in the transport direction of the shingle stream, serving as a second, front braking unit. The braking device can have at least one so-called nipple roller, which, together with a conveyor belt, another roller, or cylinder, forms a braking gap.
Data Source
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AI summary
The invention relates to a device (1), in particular a roll cross-cutter, for forming a shingle stream (2) of underlapping or overlapping sheets (3), in particular of paper or carton sheets, having a transport apparatus for transporting sheets (3), having a shingling apparatus (14) for underlapping or overlapping sheets (3) in regions, having a deceleration apparatus (21), downstream of the shingling apparatus (14) in the transport direction (X) of the sheets, for decelerating shingled sheets (3), in particular by forming a deceleration gap for the passage of shingled, combined sheets (3), and, preferably, having a cross-cutting apparatus (9) upstream of the shingling apparatus (14) for cutting a material web (5) into individual sheets (3). According to the invention, the shingling apparatus (14) is designed to be adjustable, in dependence of the cut length, in and/or opposite the transport direction (X) of the sheets (3).