Dispenser Roll Tension Control for Material Web Feeding
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Solution Overview
Problem
Devices for feeding quasi-endless material webs struggle with maintaining reliable operation under non-uniform tensile loads, especially during rapid movements of manipulation devices, as existing systems fail to balance and buffer significant changes in tensile stress effectively.
Innovation Solution
A device with a dispenser roll controlled by a motor and an angle sensor, which adjusts the material web feed by adding or removing material at specific angular positions of a floating roll, ensuring constant tensile stress through a control unit that manages the dispenser roll's rotation to buffer tensile load changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a helical tension spring is used to hold the dispenser roll under tension, then the material web can be given a predetermined tensile stress, but the system cannot effectively balance rapid and extensive changes in tensile load
Solution Approach 1:
The patent applies dynamics by replacing the static helical tension spring system with a dynamic motor-driven dispenser roll system. The motor can actively adjust the angular position of the dispenser roll in response to detected load changes, allowing the system to adapt to rapidly fluctuating tensile loads rather than relying on passive spring tension. This dynamic control enables the system to maintain operational reliability under varying load conditions.
Solution Approach 2:
The patent implements feedback through sensors that detect changes in tensile load and provide information to the control system. When load changes are detected, the system responds by adjusting the dispenser roll's angular position to add or remove material web, creating a closed-loop control system that actively maintains tension within acceptable ranges despite external load variations.
2Reliability
If the floating roll is used to buffer tensile load changes, then some tension variation can be absorbed, but rapid extensive movements of the manipulation device cause strong changes in tensile stress that exceed the buffering capacity
Solution Approach 1:
The patent uses the dispenser roll as an intermediary element between the material web source and the manipulation device. By controlling the angular position of this intermediary roll, the system can add or remove material web to compensate for tensile stress fluctuations caused by rapid manipulation device movements, thereby protecting the manipulation device from excessive tension forces.
Solution Approach 2:
The patent changes the parameter being controlled from passive tension buffering (floating roll angle) to active material length adjustment (dispenser roll angular position). The control system monitors tensile load and adjusts the dispenser roll position to maintain optimal tension, effectively managing force fluctuations that exceed the capacity of mechanical buffering alone.
3Reliability
If the dispenser roll is actively controlled to add or remove material web, then tensile load changes can be buffered effectively, but the device complexity increases with motors, sensors, and control units
Solution Approach 1:
The patent applies universality by using the dispenser roll to serve multiple functions: it acts as both the material web dispensing mechanism and the active tension control element. The same motor-driven roll that feeds material web to the manipulation device is also used to actively adjust material length and buffer tensile loads, eliminating the need for separate tensioning mechanisms and reducing overall system complexity.
Solution Approach 2:
The patent merges the tension control function with the material feeding function by integrating the motor, sensors, and control unit directly into the dispenser roll assembly. This consolidation combines what would traditionally be separate subsystems (material handling and tension control) into a unified system, reducing complexity while maintaining the ability to operate reliably under non-uniform loads.
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 allows for reliable operation of the device even under extreme tensile stress fluctuations, ensuring consistent material web feeding and maintaining functionality during rapid movements by actively managing the material web's tension through controlled dispenser roll adjustments.
Implementation Method 1
held under tension by a helical tension spring
Implementation Method 2
held under tension by a helical tension spring
Implementation Method 3
via the angle sensor detecting the angular position of the dispenser roll
Data Source
AI summary
The invention relates to a device for feeding a quasi-endless material web (4) to a manipulation device (19) receiving the material web (4), wherein a feed tension unit (8) is provided, through which the material web (4) is fed in an S-shape. The feed tension unit (8) comprises a pivotal feed dancer roller (12), the angle positions thereof being captured by a feed angle sensor (34) and fed to a control unit (36), by means of which the material web (4) is fed or retracted by a dispenser roller motor (3) in the direction of the manipulation device (19), depending on the deviation of the angle position from a reference angle position. Substantially uniform tension in the material web (4) is thereby ensured, even under extreme operating conditions.