Rebar Tying Tool Reel Detection With Self-Aligning Attachment
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Solution Overview
Problem
Existing rebar tying tools face issues with inaccurate detection of reel type due to photointerrupter contamination or exposure to scattering light, and require time-consuming manual adjustment for proper reel attachment.
Innovation Solution
The rebar tying tool employs a reduced number of photointerrupters and uses contact or contactless sensors to detect reel type through a movable member or rotation-detecting magnets, and facilitates reel positioning with a guide mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two photointerrupters are used to detect reel type, then detection reliability is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines the functions of multiple photointerrupters into a single photointerrupter by integrating multiple detection elements (first and second detection elements) within one device. This allows the single photointerrupter to detect multiple features of the reel simultaneously, achieving the same reliability as two separate photointerrupters while reducing device complexity
Solution Approach 2:
The single photointerrupter is designed with multi-functional detection capabilities, where different detection elements within the same device detect different reel features (such as rib presence, projection position, or wire winding patterns). This universal design allows one photointerrupter to perform the work of multiple photointerrupters, reducing overall system complexity while maintaining detection reliability
2Manufacturing precision
If manual position adjustment is required for reel attachment, then attachment precision can be achieved, but operation time and effort increase
Solution Approach 1:
The patent incorporates a guide mechanism that pre-aligns the reel with the reel attaching part before final attachment. The guide structure (such as guide rails or alignment features) automatically positions the reel in the correct orientation and location, eliminating the need for manual position adjustment by the user. This preliminary automated alignment achieves precise attachment while significantly reducing operation time and effort
Solution Approach 2:
The reel attachment mechanism is designed to be self-aligning and self-positioning through built-in guide features. When the reel is inserted, the guide mechanism automatically ensures proper positioning without requiring user intervention for alignment. The system serves itself by incorporating alignment functionality into the attachment process, thereby achieving precision attachment quickly and effortlessly
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Accurate reel type detection and simplified attachment process, reducing the need for manual adjustment and minimizing sensor contamination issues.
Implementation Method 1
a rotation-detecting magnet configured to integrally rotate with the reel; a rotation-detecting magnetic sensor fixed to the support and configured to detect rotation of the rotation-detecting magnet
Implementation Method 2
a photointerrupter configured to detect a shape of the bobbin as the reel rotates
Implementation Method 3
a rotation-detecting magnet configured to integrally rotate with the reel; a rotation-detecting magnetic sensor fixed to the support and configured to detect rotation of the rotation-detecting magnet
Data Source
AI summary
A rebar tying tool may include: a reel comprising a bobbin and a wire wound around the bobbin; a reel attaching part to which the reel is rotatably attached; a feeding unit configured to feed the wire from the bobbin around rebars; a twisting unit configured to twist the wire around the rebars; a type detector configured to detect a type of the reel; and a support supporting the reel attaching part, the feeding unit, the twisting unit, and the type detector. The type detector may include a movable member configured to move with respect to the support. The movable member may be at an initial position when the reel is not attached to the reel attaching part. The movable member may be at an attaching position according to the type of the reel when the reel is attached to the reel attaching part.