Variable Leverage Binding Machine Blade Transmission
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Solution Overview
Problem
The existing reinforcing bar binding machines are unable to optimize the movement speed and force of the movable blade part according to the applied load, leading to inefficient wire cutting and binding operations.
Innovation Solution
The binding machine incorporates a displacement member and transmission member that adjust the movement speed and force of the movable blade part within its range, allowing for optimized performance based on the applied load by switching between different operational regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a constant leverage transmission mechanism is used in the cutting unit, then the structure is simple and easy to manufacture, but the movement speed and force of the movable blade part cannot be optimized according to the applied load
Solution Approach 1:
The patent applies the dynamics principle by replacing the constant leverage transmission mechanism with a variable leverage mechanism. The transmission unit now includes a first link with variable leverage that can adjust its mechanical advantage based on the cutting position and load conditions. This allows the movable blade part to receive optimized movement speed and force according to the actual cutting requirements, thereby improving wire cutting efficiency while maintaining reasonable structural complexity
Solution Approach 2:
The patent implements parameter changes by modifying the leverage parameter of the transmission mechanism. The first link is designed with variable leverage characteristics that change during the cutting cycle, allowing the system to adapt the force and speed parameters dynamically. This enables optimal performance across different stages of the cutting operation, from initial contact through to complete wire severance
2Device complexity
If the movable blade part moves at constant speed with constant force, then the transmission mechanism is simple, but the binding operation time is extended and motor load is not optimized
Solution Approach 1:
The patent applies dynamics by transitioning from constant speed/force operation to variable speed/force operation. The transmission mechanism now enables the movable blade part to accelerate during low-load phases and maintain optimal speed during high-load cutting phases. This dynamic adjustment reduces the total binding operation time while allowing the transmission mechanism to remain relatively simple through the use of a variable leverage first link rather than complex multi-component systems
Solution Approach 2:
The patent implements periodic action through the cyclic variation of leverage during each cutting cycle. The first link provides different leverage ratios at different points in the cutting stroke, creating a periodic pattern of force and speed delivery that optimizes each phase of the binding operation. This periodic variation in mechanical advantage reduces overall operation time compared to constant parameter operation
3Force
If high force is applied to the movable blade part throughout the entire moving range, then wire cutting is effective, but the motor load becomes excessively high during low-load phases
Solution Approach 1:
The patent applies parameter changes by varying the force parameter delivered to the movable blade part according to the cutting stage. The variable leverage first link automatically adjusts the force transmission ratio, providing high force only when needed during wire cutting while reducing force during low-load phases such as blade return and positioning. This parameter optimization reduces overall motor load and power consumption while maintaining effective cutting performance
Solution Approach 2:
The patent implements skipping by allowing the movable blade part to move more quickly through low-load phases of the cycle. The transmission mechanism enables the blade to rush through positioning and return strokes with reduced force requirements, spending minimal time in these low-productivity phases while concentrating motor effort during the actual cutting operation. This reduces average motor load while maintaining peak cutting effectiveness
Data Source
AI summary
A binding machine includes a wire feeding unit, a curl forming unit, a cutting unit, a binding unit, and a transmission unit that transmits movement of the binding unit to the cutting unit. The binding unit includes a locking member that locks a wire, a sleeve that actuates the locking member, and a rotary shaft that actuates the sleeve. The transmission unit includes a displacement member to be displaced by movement of the sleeve, and a transmission member that transmits movement of the displacement member to the cutting unit. The cutting unit includes a movable blade part connected to the transmission member. The displacement member switches an amount of movement of the movable blade part and a force that can be generated by the movable blade part, within a moving range of the movable blade part.