Rebar Tying Tool Wire Guide for Lower Tip Protrusion
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Solution Overview
Problem
Existing rebar tying tools result in a wire-tip protruding height that is too high due to the wire tip guiding surface contacting the wire at an angle less than 90 degrees, causing the wire to move away from the rebars, leading to increased distance between the wire tip and the rebars.
Innovation Solution
A rebar tying tool configuration where the wire tip guiding surface contacts the wire tip at an angle greater than 90 degrees, causing the wire to move towards the rebars, thereby reducing the wire-tip protruding height by inclining the guiding surface relative to the central axis and incorporating a guarding surface to prevent wire detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the wire tip guiding surface contacts the wire at an angle less than 90 degrees, then the wire can be easily guided around the rebars, but the wire tip moves away from the rebars causing increased wire-tip protruding height
Solution Approach 1:
The patent changes the contact angle parameter of the wire tip guiding surface from less than 90 degrees to greater than 90 degrees. This parameter change fundamentally alters the wire tip movement direction from moving away from rebars to moving toward rebars, thereby reducing wire-tip protruding height while maintaining ease of wire guidance.
2Manufacturing precision
If the wire tip guiding surface is inclined to guide the wire toward the rebars, then the wire-tip protruding height decreases, but the wire may detach from the grasping unit
Solution Approach 1:
The patent applies preliminary anti-action by adding a guarding surface that prevents wire detachment before it can occur. The guarding surface is positioned to intercept and guide the wire tip back toward the rebars if it starts to move away, counteracting the potential harmful effect of wire detachment while maintaining the beneficial effect of reduced wire-tip protruding height.
3Manufacturing precision
If the wire tip guiding surface contacts the wire at a greater than 90 degree angle, then the wire tip moves toward the rebars reducing protruding height, but the guiding mechanism becomes more complex
Solution Approach 1:
The patent merges the wire tip guiding surface and the guarding surface into a single integrated component structure. The wire tip guiding surface and guarding surface work together as a unified guiding mechanism, reducing the number of separate parts and simplifying the overall device complexity while achieving the desired wire tip control and reduced protruding height.
Data Source
AI summary
A rebar tying tool may be configured to tie rebars with a wire. The rebar tying tool may include: a feeding unit configured to feed the wire; a guiding unit configured to guide the wire around the rebars; and a grasping unit configured to grasp the wire around the rebars. The grasping unit may include a wire tip guiding surface configured to contact a tip of the wire when the wire is guided around the rebars by the guiding unit. The wire tip guiding surface may be configured to guide the tip of the wire in a direction approaching the rebars when the wire tip guiding surface is in contact with the tip of the wire.