Pivotable Rocker Strapping Device Tensioning
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Solution Overview
Problem
Existing mobile strapping devices face challenges in applying high strap tensions with minimal slip, which can lead to reduced efficiency and safety risks.
Innovation Solution
The strapping device incorporates a mechanism where a motorized torque is applied to a rocker, increasing the pressing force of the tensioning apparatus against the strap, and utilizes the strap tension force to enhance this pressing force, thereby reducing slip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a spring is used to press the rocker against the strap, then the device structure is simple, but the pressing force is insufficient at high strap tensions
Solution Approach 1:
The patent transitions from a static spring-based pressing mechanism to a dynamic rocker mechanism that actively pivots and amplifies force. The rocker pivots about a pivot axis, converting rotational motion into enhanced pressing force that adapts to varying strap tension levels, thereby achieving high pressing force without excessive device complexity.
Solution Approach 2:
The tensioning apparatus is segmented into functionally independent components: the rocker for force application, the tensioning wheel for strap engagement, and the pivot mechanism for motion control. This segmentation allows each component to be optimized independently, with the rocker providing force amplification while the pivot mechanism controls the motion, achieving high pressing force with manageable complexity.
2Reliability
If the tensioning wheel is pressed against the strap with high force, then slip is reduced, but the device complexity increases
Solution Approach 1:
The tensioning wheel utilizes the reaction force from the strap tensioning process itself to press against the strap. As the motor drives the tensioning wheel to apply tension to the strap, the resulting reaction force automatically enhances the pressing force between the wheel and strap, reducing slip without requiring additional complex pressing mechanisms.
Solution Approach 2:
The system employs feedback where the strap tension reaction force is fed back into the pressing mechanism. The motor-driven tensioning wheel generates the pressing force through the tensioning process itself, creating a self-regulating system where higher strap tension automatically increases pressing force to prevent slip.
3Force
If a motor is used to drive the tensioning wheel, then high strap tension can be applied, but the device weight increases
Solution Approach 1:
The motor serves multiple functions: it drives the tensioning wheel to apply strap tension and simultaneously drives the rocker to enhance the pressing force. This multi-functionality allows a single motor to achieve both high strap tension and effective pressing, avoiding the need for separate motors or additional heavy components.
Solution Approach 2:
The patent merges the drive functions into a single motor that simultaneously controls both the tensioning wheel rotation and the rocker pivoting action. This consolidation reduces the overall device weight by eliminating redundant motors and components while maintaining the capability to apply high strap tension and pressing force.
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 enables the application of high strap tensions with reduced slip, ensuring functional safety and efficiency in the strapping process, even at high tension levels.
Implementation Method 1
a motorized torque is applied to a rocker, increasing the pressing force of the tensioning apparatus against the strap
Implementation Method 2
a closure is produced between the two layers of strap by frictional welding on the loop
Implementation Method 3
pressure is applied to the strap with a frictional shoe oscillating in the region of the two ends of the loop of strap
Implementation Method 4
a tensioning apparatus for applying a strap tension to a loop of a strap, wherein the tensioning apparatus is provided with a tensioning wheel which can be rotationally driven about a tensioning axis
Data Source
AI summary
Various embodiments of the present disclosure provide a mobile strapping device for strapping packaged products using a loop of wrapping strap. The strapping device includes a tensioning device for applying tension to the strap and a connecting device for connecting two overlapping portions of the strap. The tensioning device includes a rotatable tensioning wheel and a tensioning plate. The tensioning wheel is supported by a rocker that is pivotable to change a distance separating the tensioning wheel and the tensioning plate. The mobile strapping device includes a motor that is operably connectable to the rocker or the tensioning wheel such that the motor causes pivoting of the rocker or rotation of the tensioning wheel when operating in a first direction of rotation. In various embodiments, gearing, including a plurality of planetary gear sets, is used to operatively connect the motor to the rocker and the tensioning wheel.