Rebar Tying Wire Pre-Positioning for Faster Initial Winding
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Solution Overview
Problem
Conventional rebar tying machines require a significant amount of time for the initial winding of wire around rebars due to the leading end of the wire being positioned at the cutter, which prolongs the overall tying process.
Innovation Solution
The rebar tying machine positions the leading end of the wire closer to the exit of the first wire passage than the cutter at the start of the tying process, allowing for a more efficient winding mechanism that includes a feeding unit, guide unit, and cutter configuration, along with a control unit to manage the wire positioning during the tying process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the leading end of the wire is positioned at the cutter at the start of the tying process, then the wire cutting and initial positioning is simplified, but the time required to wind the wire around the rebars increases
Solution Approach 1:
The feeding unit advances the leading end of the wire to a first position closer to the exit of the first wire passage than the cutter is, before the tying process begins. This preliminary positioning action reduces the distance the wire must travel during the tying operation, thereby decreasing the time required to wind the wire around the rebars while maintaining the simplicity of the cutter-based positioning system
2Loss of time
If the leading end of the wire is positioned closer to the exit of the first wire passage than the cutter is at the start of the tying process, then the time required to wind the wire around the rebars is reduced, but the wire feeding mechanism becomes more complex
Solution Approach 1:
The feeding unit is designed to perform multiple functions: it feeds the wire continuously during the tying process and also performs the preliminary positioning of the leading end to the first position before tying begins. By combining these functions into a single multi-functional component, the patent reduces the need for separate positioning mechanisms, thereby minimizing the increase in device complexity while achieving the time reduction benefit
Data Source
AI summary
A rebar tying machine may include a feeding unit configured to feed a wire; a guide unit including a first wire passage through which the wire passes, the guide unit configured to guide the wire around rebars; and a cutter configured to cut the wire. A leading end of the wire may be configured to pass through the feeding unit, the cutter, and an exit of the first wire passage in this order. At the start of a tying process for tying the rebars with the wire, the leading end of the wire may be positioned at a first position that is closer to the exit of the first wire passage than the cutter is.