High-Speed Paper Perforation Roller with Independent Actuation
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Solution Overview
Problem
Existing paper perforation devices in high-speed printing systems face challenges in achieving high efficiency due to high moment of inertia in cutting tools, which limits their ability to maintain speed and adapt to varying paper formats and selective perforation needs, especially when handling large paper webs or requiring transversal perforation on only one document.
Innovation Solution
A modular and flexible transversal perforation device featuring two rollers with independent actuation and cutting blades, designed to operate at linear cutting and approaching speeds matching the paper flow, minimizing moment of inertia and allowing for selective perforation on either side of a document, with adjustable cutting elements for various formats.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a traditional cutting tool with high moment of inertia is used for transversal perforation, then the cutting function is reliable, but the working speed cannot be increased quickly due to high moment of inertia
Solution Approach 1:
The patent divides the cutting tool into multiple separate cutting blades (at least two cutting blades) instead of using a single large cutting tool. This segmentation reduces the moment of inertia of each individual cutting blade while maintaining the overall cutting capability, allowing for faster acceleration and deceleration to match high-speed printing operations.
Solution Approach 2:
The patent employs dynamic speed control where the cutting blades can operate at different linear speeds (cutting speed and approaching speed) independently of the paper web speed. The blades are accelerated to match the paper speed during cutting operations and can be decelerated when not in use, optimizing both speed response and energy efficiency.
2Productivity
If a continuous paper web is perforated at high printing speed, then productivity is improved, but control difficulty increases and selective perforation becomes harder to achieve
Solution Approach 1:
The system uses sensors to automatically detect the position and format of papers on the conveyor belt, and the control system automatically adjusts the cutting blade positions and timing based on this detected information. This self-service capability eliminates the need for manual control adjustments, making high-speed selective perforation easy to operate.
Solution Approach 2:
The patent incorporates a control system with sensors that continuously monitor the paper web position, paper format, and cutting blade position. The control system uses this feedback information to automatically adjust the cutting operations, ensuring precise selective perforation even at high printing speeds.
3Adaptability or versatility
If traditional perforation devices are used, then structural simplicity is maintained, but adaptability to different paper formats and selective perforation needs is limited
Solution Approach 1:
The patent designs a universal perforation device with multiple cutting blades that can handle various paper formats (A4, A3, A2, etc.) and perform different perforation patterns (transversal, longitudinal, selective side perforation). The device structure accommodates different cutting configurations without requiring complete redesign, achieving multi-functionality.
Solution Approach 2:
The cutting blades are mounted on movable supports that can be independently positioned along the conveyor direction. This dynamic positioning capability allows the same device structure to adapt to different paper formats and perforation requirements by simply adjusting blade positions rather than changing the entire device configuration.
Data Source
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AI summary
A device (1) for transversal perforation, at high speed, of a flow of paper documents comprising a first and a second roller (4, 4') that are adjacent to each other and that rotate about a same rotation axis (15). In particular, each roller (4, 4') has a plurality of cutting blades (14, 14') that are parallel to the' axis (15) and that are adapted to provide a transversal cut on the flow of paper (16) that runs, at high speed, on a counter- support roller (3). Each roller (4, 4') is operated independently by actuating means (8) (8') cause them to rotate in order to achieve selectively a linear cutting speed or a linear approaching speed. The linear cutting speed is substantially identical to the running speed of the flow of paper (16) and to that of the counter-support (3), in order to make on the flow of paper (16) a transversal perforation/cut. Vice-versa, the linear approaching speed is different from the running speed of the flow of paper (16) in order to carry out an approaching movement to prepare making a next transversal cut.