Cable Tie Tensioning with Load-Cell Closed-Loop Control
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Solution Overview
Problem
Existing cable tie tensioning tools lack accurate and consistent tension control, leading to inconsistent tensions, increased manual effort, and potential worker injury, discomfort, and prolonged application time.
Innovation Solution
A cable tie tensioning device with a load cell and closed-loop control system that measures actual tension and adjusts operation to achieve a target tension, using a motor and lead screw drive for precise tensioning, and a separate cutting mechanism triggered by the load cell for accurate cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If manual cable tie tensioning tools are used, then device complexity is reduced, but manufacturing precision and reliability of tension control deteriorate
Solution Approach 1:
The patent replaces manual mechanical tensioning with an automated motor-driven lead screw system. The motor controls the lead screw to apply precise rotational force, which translates to controlled linear tension on the cable tie. This substitution of manual mechanics with automated electromechanical systems resolves the contradiction by enabling precise tension control without requiring complex manual calibration mechanisms.
Solution Approach 2:
The patent implements a feedback control system using a load cell sensor that continuously measures the actual tension applied to the cable tie. This measurement is fed back to a controller that adjusts the motor operation to maintain the desired tension level. The feedback mechanism enables precise tension control by automatically compensating for variations, eliminating the need for complex manual calibration while maintaining high manufacturing precision.
2Ease of operation
If manual cable tie tensioning tools are used, then ease of operation is improved, but productivity and duration of action worsen
Solution Approach 1:
The patent implements a self-service system where the device automatically performs tension measurement, control adjustment, and cutting operations without requiring continuous manual intervention. The load cell continuously monitors tension and automatically adjusts the motor output, while the cutting mechanism is automatically triggered when the target tension is reached. This automation maintains ease of operation by requiring minimal user input while dramatically improving productivity through consistent, rapid operation.
3Device complexity
If mechanical tensioning assembly without calibration is used, then device complexity is reduced, but reliability of tension application worsens
Solution Approach 1:
The patent employs a feedback control system where the load cell continuously measures actual tension and provides real-time data to the controller. The controller compares the measured tension against the target tension and automatically adjusts the motor output to maintain accuracy. This feedback mechanism ensures reliable tension application by automatically compensating for tool-to-tool variations and wear, eliminating the need for complex manual calibration procedures while maintaining high reliability.
Solution Approach 2:
The patent replaces unreliable mechanical tensioning mechanisms with an automated electromechanical system. The motor-driven lead screw provides consistent, repeatable tension application based on electronic control rather than mechanical wear-prone components. This substitution improves reliability by eliminating the variability inherent in manual mechanical systems while keeping the overall device complexity manageable through integrated electronic control.
4Manufacturing precision
If accurate tension control is implemented, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent uses a feedback control system with a load cell sensor and controller to achieve precise tension control. The load cell provides real-time tension measurement, and the controller automatically adjusts motor output to maintain the desired tension level. This feedback mechanism achieves high manufacturing precision through automatic control rather than complex mechanical precision mechanisms, resolving the contradiction by using electronic control to simplify the mechanical design while maintaining accuracy.
Solution Approach 2:
The patent replaces complex mechanical precision mechanisms with an automated electromechanical system. The motor-driven lead screw combined with electronic feedback control achieves precise tension application without requiring complex mechanical linkages, gears, or calibration mechanisms. This substitution reduces device complexity by using electronic control and sensing to achieve precision that would otherwise require elaborate mechanical designs.
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
Ensures consistent and precise cable tie tensioning with real-time feedback, reducing the risk of over-tightening or under-tightening, improving safety and efficiency, and allowing for tool-to-tool consistency.
Implementation Method 1
a motor mechanically coupled to a lead screw drive and configured to axially rotate the lead screw drive
Data Source
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AI summary
A cable tie tensioning device is provided. The device includes a tensioning assembly configured to at least partially receive a cable tie and apply tension to the cable tie, and a user interface configured to receive as input a target tension to be applied by the tensioning assembly to the cable tie. The device further includes a sensor configured to measure an actual tension being applied by the tensioning assembly to the cable tie during operation of the tensioning assembly. The device further includes a controller in communication with the tensioning assembly, the user interface, and the sensor. The controller is configured to adjust operation of the tensioning assembly based on the measured actual tension from the sensor to achieve the target tension input at the user interface.