Rebar Binding Machine Guide Structure for Loop Expansion Control
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Solution Overview
Problem
Existing binding machines for reinforcing bars face issues with radial expansion of wire loops, leading to poor workability due to fixed guides that catch the binding object during removal, and insufficient suppression of radial expansion when guides are made movable.
Innovation Solution
A binding machine with a guide unit that includes a first guide for curling wires and a second guide with a third guide to restrict radial position and a fourth guide to further regulate the loop's radial position, allowing for adjustable movement to prevent radial expansion and improve workability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a pair of guides are fixed to restrict radial expansion of wire loops, then radial expansion is suppressed, but the binding object is caught by the guide during removal, deteriorating workability
Solution Approach 1:
The guide unit is divided into multiple independent guides (first guide unit, second guide unit, third guide unit, fourth guide unit) that can move relative to each other. This segmentation allows each guide to perform its function of restricting radial expansion while the overall structure can be pulled out freely during removal.
Solution Approach 2:
The guides are designed to be movable rather than fixed. The first guide unit can move in the radial direction of the wire loop, and the second guide unit can move relative to the first guide unit. This dynamic design allows the guides to maintain contact with the wire loop for radial restriction while allowing the binding machine to be pulled out during removal operations.
2Ease of operation
If one guide is made rotatable to prevent catching during removal, then workability is improved, but radial expansion of wire loops is not sufficiently suppressed
Solution Approach 1:
Instead of making a single guide rotatable, the system uses multiple segmented guides (third guide unit and fourth guide unit) that can move independently. This segmentation allows radial restriction to be maintained through the coordinated movement of multiple guides rather than relying on rotation of a single guide.
Solution Approach 2:
The guides are designed with multiple degrees of freedom, allowing them to move in different directions and modes. The first guide unit moves radially, while the second guide unit moves relative to the first, creating a dynamic system that maintains radial restriction while enabling easy removal.
3Manufacturing precision
If multiple guides are added to improve radial restriction, then radial expansion is better suppressed, but device complexity increases
Solution Approach 1:
Multiple guides are merged into a single integrated guide unit structure. The first guide unit, second guide unit, third guide unit, and fourth guide unit are combined into one cohesive assembly that functions as a unified system, reducing overall structural complexity while maintaining the radial restriction function.
Solution Approach 2:
The guide unit is designed to perform multiple functions simultaneously: the first guide unit curls the wire, the second guide unit guides the curled wire, and the third and fourth guide units restrict radial expansion. This multi-functionality reduces the need for separate components, thereby reducing overall device complexity.
Data Source
AI summary
It provides a reinforcing bar binding machine which reduces restrictions on a moving direction of the reinforcing bar binding machine in an operation of pulling out a reinforcing bar bound with a wire. A reinforcing bar binding machine (1A) includes a curl guide unit (5A) that winds a wire (W) around a reinforcing bar (S), a wire feeding unit (3A) that feeds the wire (W), and a binding unit (7A) that twists crossing portions between one end and the other end of the wire (W) wound around the reinforcing bar (S). The curl guide unit (5A) includes a first guide unit (50) that curls the wire (W) fed by the feeding unit (3A) and a second guide unit (51) that guides the wire (W) fed from the first guide unit (50) to the binding unit (7A), and the second guide unit (51) includes a fixed guide unit (54) that restricts a position in a radial direction of the wire (W) wound around the reinforcing bar (S) and a movable guide unit (55) that restricts a position in an axial direction of the wire (W) wound around the reinforcing bar (S).