Rebar Binding Machine Cutting Unit for Staggered Wire Cutting
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Solution Overview
Problem
Existing reinforcing bar binding machines experience increased load during wire cutting operations due to wear of the step portion between blade parts, leading to phase differences in cutting timings and inefficient wire binding.
Innovation Solution
A binding machine with a cutting unit featuring a pair of blade parts and a regulation portion that suppresses wear by regulating the movement of one wire between butting portions, ensuring a consistent phase difference in cutting timings and reducing load by starting cutting of one wire before the other.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a step portion is provided between blade parts to delay cutting of one wire relative to another, then the load in wire cutting operation is reduced, but the step portion wears over time causing loss of phase difference in cutting timings
Solution Approach 1:
The regulation portion is positioned upstream of the step portion to preliminarily control the wire position before it reaches the cutting edge. This preliminary action ensures that the wire is properly positioned relative to the step portion, maintaining the phase difference in cutting timings even as the step portion wears over time
Solution Approach 2:
The regulation portion acts as an intermediary element between the wire feeding mechanism and the cutting blades. It mediates the wire position to ensure proper alignment with the step portion, thereby maintaining the intended cutting sequence and phase difference without direct wear from the cutting operation
2Productivity
If wires are cut simultaneously to improve productivity, then the binding speed increases, but the load on the cutting unit becomes excessive
Solution Approach 1:
The cutting operation is divided into periodic phases where one wire is cut before the other, creating a staggered cutting sequence. This periodic action reduces the peak load on the cutting unit while maintaining efficient binding speed through the coordinated alternating cutting of multiple wires
Data Source
Figure 1
Figure 2A~2B
Figure 2C~3A
AI summary
A binding machine including a wire feeding unit, a cutting unit, and a binding unit. The cutting unit includes a pair of blade parts that sandwiches and cuts a first wire and a second wire therebetween, a first butting portion against which the first wire is butted by relative movement of the pair of blades, and a second butting portion against which the second wire is butted. The cutting unit has a step portion provided between the first butting portion and the second butting portion by recessing the second butting portion with respect to the first butting portion along a moving direction of the pair of blade parts. The cutting unit has a regulation portion that regulates movement of the first wire in a direction from the first butting portion toward the second butting portion and provided between the first butting portion and the step portion.