Vacuum Transfer Roller with Movable Screen Cover for Web Cutting
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Solution Overview
Problem
Existing devices for cutting material webs into sections lack flexibility in changing section lengths, requiring time-consuming format changes and resulting in increased downtime due to the fixed hole pattern on vacuum rollers.
Innovation Solution
A device with a cutting unit, vacuum transfer roller, and adjustable motor drives allows for independent speed control of the vacuum transfer roller and material web, enabling cutting of different formats and section lengths without needing to exchange vacuum rollers, and allows for variable rotational speeds and directions to adjust section spacing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a vacuum roller with a fixed hole pattern is used for cutting, then sections can be cut with lengths that are multiples of the hole pattern (e.g., 5mm), but changing to different section lengths requires exchanging the vacuum roller, which increases downtime and reduces flexibility
Solution Approach 1:
The vacuum roller is equipped with a movable screen cover that can be shifted in the longitudinal direction to change the effective hole pattern. This dynamic adjustment allows the same vacuum roller to accommodate different section lengths without exchange, resolving the contradiction between adaptability and downtime by making the system configurable rather than static
Solution Approach 2:
The invention changes the parameter of the vacuum roller's effective configuration by moving the screen cover to different positions. This parameter change (position of screen cover) enables the same physical roller to produce different cutting patterns and section lengths, eliminating the need for roller exchange and reducing downtime while maintaining versatility
2Adaptability or versatility
If the vacuum transfer roller speed is fixed relative to web speed, then sections are cut at fixed lengths based on the hole pattern, but this limits the ability to cut different formats without exchanging rollers
Solution Approach 1:
The screen cover on the vacuum roller is made movable along the longitudinal axis, allowing dynamic reconfiguration of the effective hole pattern. This enables the same roller to cut different formats by adjusting the screen cover position, eliminating device complexity associated with exchanging rollers while maintaining adaptability
Solution Approach 2:
The vacuum roller with movable screen cover becomes a universal cutting device that can handle multiple formats and section lengths. By making the roller multi-functional through the adjustable screen cover, the invention eliminates the need for multiple specialized rollers, reducing device complexity while enhancing versatility
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 enhances flexibility and reduces downtime by allowing the cutting of various section lengths and formats with the same vacuum transfer roller, enabling efficient transfer and spacing of sections without additional process steps, minimizing waste and optimizing production efficiency.
Implementation Method 1
a vacuum transfer roller (20), by means of which sections (14, 14') cut from the material web (12) can be transported
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a device (10) for cutting a web of material (12) into sections (14, 14'). The device (10) has a cutting unit (24), which can be designed, in particular, as a knife roller (24). Furthermore, the device has a vacuum transfer roller (20) which can be rotated by means of a first motor drive and at least one feed unit (22) which can be driven by means of a second motor drive and through which the web of material (12) can be moved towards the cutting unit (24). The two motor drives can be driven independently of each other, so that, in a corresponding cutting process, the rotational speed of the vacuum transfer roller (20) can be at least temporarily greater than the web speed of the web of material (12) that has not yet been cut into sections (14, 14'). This creates a gap (60) between each section (14) and the still uncut web of material (12).Furthermore, the rotational speed of the vacuum transfer roller (20) after the transfer of a respective subsection (14) to another material web (62) can be lower than immediately before the transfer of the corresponding subsection (14), so that a gap is created between the already transferred subsection (14) and the following subsection (14').