Rebar Binding Cutter Mechanism for Stable Wire End Position
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Solution Overview
Problem
Conventional reinforcing bar binding machines often result in wire ends being displaced from the rear side of the reinforcing bars during binding, leading to poor appearance and potential concrete cracks due to water infiltration, and also suffer from wire jamming issues when the reel runs low, requiring disassembly of the guide portion.
Innovation Solution
The solution involves a cutting die with a wire through hole and a rotating blade portion to securely hold the wire end until the binding is complete, and a fixed curl guide with a movable curl guide and cover portion to prevent foreign wires from entering the machine's interior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the wire is twisted to bind the reinforcing bars, then the binding strength is improved, but the wire end portions may project laterally and be caught by the guide portion, causing displacement and poor appearance
Solution Approach 1:
The cutter is designed to hold the wire end portion after cutting, preventing it from projecting laterally during the twisting process. This preliminary holding action ensures the wire end remains in position before the twisting operation completes, resolving the contradiction between achieving strong binding and maintaining wire end position stability
2Productivity
If the guide portion is pulled out after binding to disengage from the reinforcing bar, then the binding operation is completed, but the wire end portions may be caught by the guide portion and displaced to the twisted portion side
Solution Approach 1:
The cutter maintains holding engagement with the wire end portion throughout the guide portion withdrawal process, ensuring the wire end remains secured even when the guide portion is pulled out. This prevents the wire end from being caught and displaced, allowing complete disengagement while maintaining wire end position stability
3Reliability
If the wire is held by the cutter and guide portion to prevent displacement, then the wire end position stability is improved, but the remaining wire piece may jam when the wire reel runs low
Solution Approach 1:
The wire end portion is extracted from the general wire structure and held separately by the cutter's holding mechanism. This separation allows the wire end to be securely positioned during binding while enabling easy removal of the cutter holding mechanism when the wire reel runs low, preventing jamming and facilitating quick wire replacement
4Ease of operation
If the movable curl guide is opened to allow access for maintenance or to detect abnormalities, then the ease of operation is improved, but foreign matter such as small wire pieces can enter the machine interior
Solution Approach 1:
A cover portion is introduced as an intermediary element between the movable curl guide opening and the machine interior. This cover can be opened when access is needed for maintenance or abnormality detection, but when closed it prevents foreign matter from entering the machine interior, thus resolving the contradiction between ease of operation and protection from contamination
Data Source
AI summary
A reinforcing bar binding machine is provided with a cutting die having a wire through hole which penetrates through the die along a direction in which a wire is fed out, a blade portion adapted to move along an open plane of an opening at one end of the wire through hole to cut a terminating end portion of the wire which has passed through the wire through hole and an engagement portion adapted to be brought into engagement with a portion of the wire which lies in the vicinity of the terminating end portion thereof when the blade portion is rotated so as to bend to hold the portion lying in the vicinity of the terminating end portion.