Automated Dereeler Tension Control via Dancer Arm Feedback
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Solution Overview
Problem
Manufacturing processes requiring continuous materials like coils face issues with jamming due to inconsistent tension, necessitating a solution for maintaining constant tension during material feed.
Innovation Solution
An automated dereeler system with a motor, brake, dancer arm, and spring assembly, controlled by a sensor and PLC, regulates tension by adjusting the rotation of the spool axle to maintain consistent material feed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spool is paid out during fabrication without automated tension control, then the manufacturing process can proceed, but the tension becomes inconsistent causing jamming and reduced machine performance
Solution Approach 1:
The patent employs a dancer arm with a transducer that continuously monitors material tension and provides feedback signals to a PLC controller. The controller adjusts motor torque in real-time based on this feedback, maintaining constant tension and preventing jamming while automating the tension control function.
Solution Approach 2:
The patent replaces manual mechanical tension control with an automated electromechanical system consisting of a motor, brake, dancer arm, and PLC controller. This substitution eliminates inconsistent manual operation and provides precise, automated tension management.
2Stability of the object's composition
If tension is maintained at high levels to prevent slack, then material feed stability improves, but the risk of jamming and machine damage increases
Solution Approach 1:
The patent uses a dynamic tension control system where the motor torque is continuously adjusted based on dancer arm position feedback. The system adapts tension levels in real-time, maintaining stability without excessive force, and automatically responds to tension variations to prevent both slack and jamming conditions.
Solution Approach 2:
The patent dynamically changes the torque parameter applied by the motor based on real-time tension measurements. The PLC controller modulates motor output to maintain tension within optimal ranges, adjusting parameters continuously to prevent harmful effects while ensuring stable material feed.
3Manufacturing precision
If automated control systems are added to maintain constant tension, then tension consistency improves, but device complexity and cost increase
Solution Approach 1:
The patent implements a feedback control loop using a dancer arm with integrated transducer that monitors tension and signals the PLC controller. This automated feedback mechanism maintains precise tension consistency while reducing the need for complex manual control systems.
Solution Approach 2:
The dancer arm system automatically self-regulates tension through its mechanical design, where the arm's natural movement in response to tension changes provides the control signal. This self-service mechanism simplifies the overall control system architecture while maintaining high manufacturing 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
The system effectively prevents jamming by maintaining constant tension, ensuring smooth operation of manufacturing machines by dynamically adjusting resistance based on material tension.
Implementation Method 1
A spring assembly has a first end and a second end, the first end being secured to the housing and the second end being secured to the dancer arm. The spring assembly biases the dancer arm toward the first dancer arm position.
Implementation Method 2
A brake is secured to the housing and is positioned to provide a constant braking torque to the axle.
Implementation Method 3
A motor is secured proximate to the housing and is mechanically interconnected to the axle.
Data Source
AI summary
An automatic dereeler includes a rocker arm that is movable between various positions to indicate the relative tension on a continuously supplied material. A sensor detects the rocker arm position which is transmitted to a controller. The controller actively controls a motor to either increase or decrease the resistive torque on a rotating axle that carries the continuous material.