Bobbin Fixing Apparatus with Magnetic Detent and Self-Service Coupler
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Solution Overview
Problem
Conventional bobbin fixing apparatuses face issues with securing bobbins to rotating shafts, leading to unwanted separation and cumbersome operation, especially during winding and unwinding, due to complex detent mechanisms and the need for manual intervention to maintain object positioning.
Innovation Solution
A bobbin fixing apparatus utilizing a fixing unit with a recess and shaft fixing member, combined with a magnetically operated end coupler that uses attractive and repulsive forces to securely attach and detach the bobbin from the rotating shaft, allowing for easy placement and secure fixing of the bobbin regardless of orientation, and automatic adjustment of object positioning during winding and unwinding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a detent mechanism is used to secure the bobbin to the rotating shaft, then the bobbin can be fixed in position, but the bobbin cannot be easily separated and replacement becomes troublesome
Solution Approach 1:
The bobbin's own weight and placement action automatically drive the detent to rotate and engage with the detent insertion recess, securing the bobbin without requiring separate fixing operations. When the bobbin is removed, the detent automatically returns to its initial position, enabling easy replacement without manual intervention.
Solution Approach 2:
The detent is pre-positioned in a retracted state within the rotating shaft, ready to engage. The elastic component pre-stores energy to facilitate automatic detent rotation upon bobbin placement, ensuring secure fixation is achieved automatically before the bobbin rotation begins.
2Reliability
If a detent is rotated to insert into the detent insertion recess to secure the bobbin, then the bobbin is fixed, but incorrect placement may still cause detent rotation leading to inaccurate securing
Solution Approach 1:
The detent and detent insertion recess are designed with asymmetric geometries that only match in the correct placement orientation. The detent has a specific engagement surface that corresponds to the recess shape, allowing accurate securing only when the bobbin is placed in the correct orientation, while preventing false engagement from incorrect placement.
3Reliability
If a rotatable member with elastic torsion member is used to keep the object end in fixed position, then the object end can be secured, but manual pressing is required to release and the operation becomes troublesome
Solution Approach 1:
The elastic torsion member automatically returns the rotatable member to its initial position after the object end is placed, releasing the locking state without requiring manual pressing. This enables automatic object end release, eliminating the need for troublesome manual operations during unwinding.
Solution Approach 2:
The rotatable member automatically transitions between locked and unlocked states through periodic rotation driven by the elastic torsion member's energy release, creating a cyclical locking-unlocking mechanism that simplifies operation during winding and unwinding cycles.
4Productivity
If the rotating shaft is rotated before the object end is properly positioned, then rotation can begin, but damage may occur to the object or device
Solution Approach 1:
The coupling member with its elastic torsion member automatically locks the object end in position before the winding operation begins. This preliminary automatic positioning ensures the object is securely attached to the bobbin, preventing damage during subsequent rotation and improving both safety and operational reliability.
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
The solution ensures secure attachment and easy detachment of the bobbin, prevents unwanted separation, and simplifies the process of keeping the object in a fixed or released position, enhancing operational convenience and stability during rotation.
Implementation Method 1
an elastic spring (not shown) and a horizontally movable stopper (not shown) are accommodated in the rotating shaft 2
Implementation Method 2
a movable magnet and a stationary magnet of opposite magnetic polarities are positioned to have a magnetic attraction force therebetween
Implementation Method 3
both having the same magnetic polarity are positioned to have a magnetic repulsion force therebetween
Data Source
AI summary
Disclosed is a bobbin fixing apparatus. The bobbin fixing apparatus includes a rotating shaft installed to a mounting plate and provided with a fixing unit partially protruding from the rotating shaft so as to be inserted into the rotating shaft, and a bobbin on or from which an object is wound or unwound, the bobbin being placed on the rotating shaft such that the fixing unit is exposed in front of the bobbin. The bobbin includes a rotating body, a plurality of bobbin members on which an object is wound, and an end coupler configured to be operated upon receiving pressure when the bobbin is placed on the rotating shaft, the end coupling serving to keep an end of the object in a fixed position on the rotating shaft during winding or to release the end of the object from the fixed position during unwinding.