Cradle Arm Geometry for Stable Package Contact Pressure
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Solution Overview
Problem
Existing winding devices experience significant variation in contact pressure due to the increase in package diameter, especially during soft winding, leading to increased costs and operational inefficiencies.
Innovation Solution
The winding device design incorporates a cradle arm that swings about a swing fulcrum, maintaining a contact point with the package above the horizontal plane and limiting the orthogonal component of the package's weight to less than 1/√2, using the package's weight as contact pressure, and stopping winding before the cradle arm aligns vertically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a contact pressure adjusting mechanism is used to apply predetermined contact pressure to the package, then the contact pressure can be maintained, but the mechanism requires large output and increases cost
Solution Approach 1:
The package's own weight is utilized to generate the contact pressure against the rotation drum, eliminating the need for an external contact pressure adjusting mechanism. The system serves itself by using the packaged material's weight as the pressing force, thereby reducing device complexity and cost while maintaining the required contact pressure for winding operations
Solution Approach 2:
The cradle arm is designed to swing in response to the package weight, creating a mechanical system where the package weight itself becomes the counterbalancing force that maintains optimal contact pressure. As the package diameter increases, the cradle arm's swing motion adjusts the contact point to maintain consistent pressure without requiring additional active control mechanisms
2Device complexity
If the package is positioned above the winding drum to use weight as contact pressure, then the contact pressure adjusting mechanism output can be reduced, but the contact pressure increases significantly with package diameter and weight variation
Solution Approach 1:
The cradle arm is designed as a dynamic element that can swing freely in response to changes in package weight and diameter. This dynamic adjustment allows the system to automatically compensate for varying package characteristics, maintaining relatively constant contact pressure throughout the winding process without requiring active control mechanisms
Solution Approach 2:
The system changes the geometric parameters of the cradle arm configuration as the package grows. By allowing the cradle arm to swing and changing the contact point position dynamically, the system adjusts the mechanical leverage and angle to maintain consistent contact pressure despite changes in package mass and dimensions
3Force
If the cradle arm swings to maintain contact pressure as package diameter increases, then contact pressure can be maintained, but the height of the winding device increases
Solution Approach 1:
Instead of maintaining a fixed vertical arrangement, the system introduces angular movement in the horizontal plane through the cradle arm's swing motion. By transitioning from a purely vertical dimension to include angular adjustment, the system maintains contact pressure while managing the vertical height requirement through geometric reconfiguration
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
This design stabilizes contact pressure, reduces height, and facilitates easy package collection and bobbin supply, enabling efficient soft winding without excessive mechanical output.
Implementation Method 1
the contact point between the rotation drum and the bobbin or package is arranged to be within an angle which is more than 0 degrees and less than 45 degrees when a horizontal direction passing through a starting point which is the center of the rotation drum is defined as 0 degrees
Data Source
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AI summary
An object of the present invention is to provide a winding device which is able to suppress the variation of contact pressure while using the weight of a package as the contact pressure. When viewed in an axial direction of a rotation drum 40, each cradle arm 30 swings so that, as the diameter of a package Pw increases, a direction of an inclined straight line L connecting a swing fulcrum U with a center V of a bobbin Bw supported by the cradle arm 30 gradually approaches a vertical direction. Furthermore, until the direction of the inclined straight line L becomes identical to the vertical direction after the start of winding of a yarn, a contact point S between the rotation drum 40 and the bobbin Bw or wound package Pw is arranged to be within an angle which is more than 0 degrees and less than 45 degrees on the premise that a horizontal direction passing through a starting point which is a center C of the rotation drum 40 is defined as 0 degrees.