Pressure-Assisted Web Conveyance for Precise Sheet Cutting
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Solution Overview
Problem
Conventional conveyor systems face challenges in precisely adjusting the length of sheets cut from webs, particularly with thin materials, due to issues like web sagging, slippage, and material distortion, which complicates precise cutting.
Innovation Solution
A device with a pressure and movement mechanism that applies and releases pressure to the web, ensuring precise movement and cutting by using a support with a higher coefficient of friction and adhesion promoters, along with a hold-down device to maintain web flatness, allowing for precise adjustment and cutting of thin materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional conveyor systems with rollers and spring-mounted guides are used, then the web can be transported, but web sagging and slippage occur causing imprecise sheet length adjustment
Solution Approach 1:
The patent replaces the conventional roller-based mechanical conveyor system with a suction conveyor system that uses vacuum pressure to transport the web. This substitution eliminates slippage between rollers and web, and prevents web sagging by providing uniform support across the entire web surface through the suction force, thereby achieving precise sheet length adjustment.
Solution Approach 2:
The patent employs a suction conveyor system utilizing vacuum pressure (pneumatics) to convey the web through the cutting device. The vacuum field provides reliable grip on the web material, preventing slippage and maintaining precise positioning during transport, which directly addresses the reliability and precision issues of conventional mechanical conveyor systems.
2Manufacturing precision
If the table is pivoted upwards using a clutch and connecting rods to clamp the web, then the web can be clamped for cutting, but play in the mechanism makes precise length adjustment difficult
Solution Approach 1:
The patent replaces the complex mechanical clamping mechanism (clutch and connecting rods) with a vacuum-based holding system. The vacuum field provides continuous holding force on the web without mechanical contact, eliminating play and clearance issues inherent in mechanical linkages, thereby enabling precise length adjustment while simplifying the device structure.
Solution Approach 2:
The patent introduces a vacuum field as an intermediary between the conveyor and the web material. This vacuum intermediary provides smooth, play-free engagement and holding of the web, replacing direct mechanical contact that introduces clearance and imprecision, thus achieving precise positioning without complex mechanical clamping structures.
3Productivity
If conventional roller conveyors are used with thin materials, then the web can be transported, but slippage and material distortion occur
Solution Approach 1:
The patent replaces roller-based mechanical conveyance with a vacuum field-based conveyance system. The vacuum field distributes holding force uniformly across the entire web surface, preventing localized slippage and distortion that occur with roller contact on thin materials, thereby maintaining both productivity and positioning precision.
Solution Approach 2:
The patent changes the fundamental parameter of web-conveyor interaction from mechanical contact force (rollers) to pressure differential (vacuum). This parameter change enables effective and precise handling of thin materials by distributing the holding force across the entire web surface area, preventing slippage and distortion while maintaining transport capability.
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
Enables precise cutting of thin materials into predetermined lengths with high dimensional accuracy, preventing sagging and slippage, and ensuring flat conveyance without jamming, suitable for materials like polymers and polycarbonates.
Implementation Method 1
conveying device (3) with a suction conveyor by which the web of material (1) is held and moved through a cutting device (2)
Implementation Method 2
the web of material (1) is pressed against the support surface (41) with a vacuum field
Implementation Method 3
support (4) with a support surface (41) for the web of material (1), which has an adhesion promoter
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A device is proposed for the intermittent conveying of a web of material along a conveying direction and for cutting the web. The device comprises a cutting unit for cutting the web at an angle transverse to the conveying direction and a conveying unit for conveying the web in the conveying direction. The conveying unit includes a support for the web, as well as a pressure and movement unit for applying and releasing pressure that presses the web against the support and generates movement of the web relative to the support in the conveying direction.The conveying system is designed and configured to move the printing and moving unit from a starting position towards the print bed. Subsequently, while maintaining at least partial pressure, the unit moves the print bed in the conveying direction to a forward end position, thereby initiating the movement of the web relative to the print bed. Moving the printing and moving unit towards the print bed allows for particularly precise definition of the web's starting point. By selecting an appropriate pressure setting, slippage between the printing and moving unit and the web can be reliably and easily prevented as the unit moves in the conveying direction to a forward end position.This also allows the endpoint of the material path's movement to be defined with particular precision.