Wire Feeding Unit with Directional Contact Adjustment
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Solution Overview
Problem
Existing binding machines for reinforcing bars struggle to apply an appropriate load when pulling back the wire, leading to loosening and deviation of the reinforcing bars.
Innovation Solution
The binding machine incorporates a wire feeding unit with a feeding member that adjusts the amount of contact with the wire based on the feeding direction, applying a larger load when feeding the wire in the reverse direction to ensure strong pulling back force without increasing the forward load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the wire is fed with a strong force to pull back the surplus wire, then the binding force is improved, but the feeding speed decreases and the wire may buckle
Solution Approach 1:
The pressing force applied to the wire is made dynamic rather than static. The pressing member adjusts the amount of contact with the wire based on the feeding direction: applying a larger pressing force when feeding in the reverse direction (to pull back surplus wire) and a smaller pressing force when feeding in the forward direction. This dynamic adjustment resolves the contradiction by applying strong force only when needed for binding, maintaining feeding speed during forward motion and preventing wire buckling.
2Strength
If the pressing force is increased to pull back the surplus wire, then the binding force is improved, but the wire may buckle on the way
Solution Approach 1:
The pressing force is dynamically adjusted based on feeding direction. During reverse feeding when surplus wire needs to be pulled back, a larger pressing force is applied to ensure strong binding. During forward feeding, a smaller pressing force is applied, preventing wire buckling while maintaining sufficient control. This directional dynamic control eliminates wire buckling while preserving binding strength.
3Strength
If the wire is fed in the forward direction with an unnecessarily strong force, then the binding force is improved, but the feeding speed decreases
Solution Approach 1:
The pressing member dynamically adjusts the pressing force according to the feeding direction. When feeding the wire in the forward direction, a smaller pressing force is applied, maintaining high feeding speed and productivity. When feeding in the reverse direction to pull back surplus wire, a larger pressing force is applied to ensure adequate binding force. This dynamic adjustment eliminates the trade-off between binding force and feeding speed.
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 effective binding of reinforcing bars by maintaining the wire in close contact with the bars, enhancing the binding force while preventing unnecessary load increase during forward feeding, thus suppressing feeding speed decrease and wire buckling.
Implementation Method 1
a feeding member (30a, 30b) having a part that is in contact with the wire and configured to feed the wire with being displaced along a feeding direction of the wire
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
A binding machine includes a wire feeding unit, a curl forming unit, a cutting unit, and a binding unit. The wire feeding unit includes a feeding member having a part that is in contact with the wire and configured to feed the wire with being displaced along a feeding direction of the wire. An amount of contact between the feeding member and the wire is switched in accordance with the feeding direction of the wire. As compared to the amount of contact in an operation of feeding the wire in one direction, the amount of contact in an operation of feeding the wire in other direction, which is opposite to the one direction, is made larger.