Rebar Tying Clamp With Fixed Wire Bending During Twisting

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Solution Overview

Problem

Existing rebar tying machines require excessive time to tie rebars with wire due to the process of bending the wire end portion towards the rebars after twisting, and their configuration is complex with a sliding bending member along the center axis.

Innovation Solution

A rebar tying machine with a fixed bending member that bends the wire end portion towards the rebars while twisting, reducing complexity by having a separate component that is immovable relative to the main body housing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the bending member slides along the center axis to bend the wire end portion, then the wire can be bent toward the rebars, but the configuration of the rebar tying machine becomes complex

Engineering Contradiction:

Improvewire bending capabilityVSAvoidmachine configuration

Core Design Contradiction:

Ease of manufactureVSDevice complexity

Solution Approach 1:

The bending function is segmented from the twisting unit and implemented by a separate, fixed bending member. This segmentation allows the bending operation to be performed independently without requiring the bending member to slide along the center axis, thereby simplifying the overall machine configuration while maintaining wire bending capability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The bending member is positioned and configured in advance to bend the wire end portion during the twisting operation. By pre-positioning the bending member in a fixed location rather than requiring it to slide during operation, the machine configuration is simplified while still achieving the necessary wire bending toward the rebars.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If the wire is twisted after the end portion is bent toward the rebars, then the tying process can be completed, but the time required to tie the rebars increases

Engineering Contradiction:

Improvetying completionVSAvoidtime required to tie rebars

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The bending and twisting operations are merged into a single simultaneous process. The fixed bending member bends the wire end portion toward the rebars while the twisting unit rotates the clamp to twist the wire, both actions occurring concurrently during one continuous motion rather than sequentially, thereby reducing the total time required to complete the tying process.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The bending and twisting operations are performed continuously and simultaneously in one uninterrupted action. The bending member remains in a fixed position to continuously bend the wire end while the twisting unit continuously rotates to twist the wire, eliminating idle time between operations and maintaining continuous useful action throughout the tying process.

Inventive Principle:

Principle #20Continuity of useful action

Data Source

PatentUS20250229320A1Rebar tying machine and method for tying

Publication Date: 2025.07.17 MAKITA CORP

AI summary

A rebar tying machine may include a feeding unit configured to feed a wire; a guide unit configured to guide the wire around rebars; a cutter configured to cut the wire; a clamp configured to be rotatable about a center axis and hold the wire; a main body housing supporting the feeding unit; and a bending member configured to bend an end portion of the wire toward the rebars, wherein the end portion of the wire is formed by the cutter cutting the wire. The bending member may be configured to bend the end portion of the wire toward the rebars while the wire is twisted by rotation of the clamp.