Binding Machine Cutter Geometry to Prevent Wire End Pinching
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Solution Overview
Problem
Existing reinforcing bar binding machines face issues with the wire end portion being caught and clogged between the curl guide and cutter or movable blade and link member, leading to reduced efficiency and increased wear, as the engaging portion's acute angle design fails to securely hold the wire end over time.
Innovation Solution
The binding machine incorporates a wire feeding portion, a cutting portion with a fixed and movable blade, and guide portions with abutment points to regulate the wire's direction, ensuring the wire is properly guided and cut, preventing pinching by expanding openings and reducing the distance between moving parts when the movable blade transitions to a standby position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the engaging portion is formed at an acute angle to hold the wire end, then the wire can be held initially, but repeated use causes gradual wear that prevents firm holding
Solution Approach 1:
The patent changes the geometric parameters of the engaging portion from an acute angle to a right angle configuration. This parameter change maintains the wire holding capability while significantly improving durability by distributing wear more evenly across the engaging surfaces, preventing the gradual wear that occurs with acute angle designs.
Solution Approach 2:
The patent divides the wire end holding function into two separate components: the engaging portion (which provides the holding force) and the abutment portion (which provides positioning and support). This segmentation allows each component to be optimized independently, with the abutment portion taking on some of the wear and positioning duties, thereby extending the service life of the engaging portion.
2Device complexity
If the movable blade slides close to the guide portion to reduce space, then the structure is compact, but the wire end may be pinched between them
Solution Approach 1:
The patent introduces an abutment portion as an intermediary element between the movable blade and the guide portion. This abutment portion serves as a mediator that provides a dedicated wire end positioning surface, preventing direct contact and potential pinching between the wire end and the moving blade-guide portion interface, while still maintaining structural compactness.
Solution Approach 2:
The abutment portion is designed to automatically position the wire end in the correct location without requiring additional active control mechanisms. The wire end naturally abuts against this portion during the cutting cycle, providing self-positioning that prevents pinching while maintaining a simple, compact structure.
3Ease of operation
If the opening in the movable blade is expanded to facilitate wire passage, then wire removal is easier, but the structural integrity and cutting precision may be compromised
Solution Approach 1:
The patent segments the wire interaction functions by introducing a separate abutment portion that handles wire positioning and support, while the movable blade's opening is optimized for cutting precision. This segmentation allows the movable blade to have a precisely controlled opening geometry that maintains cutting accuracy, while the abutment portion provides the wire removal facilitation through its geometry and positioning function.
Data Source
AI summary
A binding machine comprises a cutting portion which cuts the wire, a fixed blade in which a first wire passage through which the wire passes is formed; and a movable blade in which a second wire passage through which the wire passes is formed. The movable blade includes a blade portion provided on one side of the second wire passage and a passage forming member provided on the other side of the second wire passage, the second wire passage includes a guiding portion for guiding the wire after cutting in a movement when the movable blade moves from the movement finish position to the standby position, and the guiding portion is protrudes in a direction of the guide portion and blocks a portion between the movable blade and the guide portion in a non-wire-passing-through manner when the movable blade moves to the standby position.