Capping Device Thread Override Prevention
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Solution Overview
Problem
Conventional capping devices for resin containers often experience 'thread overriding' during cap attachment, leading to contamination and damage due to insufficient strength of threaded components and impact from filling liquids.
Innovation Solution
The capping device lowers the cap while rotating it to align the threaded portions smoothly, starting the servomotor rotation at a predetermined timing to alleviate impact and prevent 'thread overriding', thereby ensuring secure engagement without contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the cap is lowered to contact the threaded portion prior to rotation, then the capping process is simple and fast, but thread overriding occurs causing contamination and damage
Solution Approach 1:
The patent applies preliminary action by rotating the cap at a predetermined angle before lowering it to contact the threaded portion. This pre-rotation aligns the threaded portions properly, preventing thread overriding during the capping process while maintaining high productivity through automated timing control.
Solution Approach 2:
The patent employs dynamics by using a servomotor to dynamically adjust the rotation timing and angle of the cap based on the lowering speed and position. This dynamic control ensures optimal alignment between threaded portions throughout the capping process, preventing contamination and damage while maintaining efficient operation.
2Weight of moving object
If the threaded portion is made lighter for weight reduction, then the container and cap weight decrease, but the threaded portion becomes insufficiently strong and prone to damage
Solution Approach 1:
By pre-rotating the cap to align threaded portions before contact, the patent eliminates impact loads on the lightweight threaded portions. This allows the use of lighter materials while maintaining sufficient strength, as the alignment process prevents shock loading that would otherwise cause damage.
Solution Approach 2:
The patent applies preliminary anti-action by pre-aligning the threaded portions through rotation before they engage. This counteracts the potential for misalignment and impact forces that would damage lightweight threaded portions, enabling weight reduction without compromising strength.
3Productivity
If the cap is lowered quickly to maintain production speed, then productivity increases, but impact from filling liquid causes thread overriding and contamination
Solution Approach 1:
The patent performs preliminary rotation of the cap at a predetermined angle before lowering it quickly. This pre-alignment ensures that the threaded portions are properly matched before contact, preventing thread overriding even during rapid lowering. Consequently, filling liquid does not spill and contamination is avoided, maintaining both high productivity and product integrity.
Solution Approach 2:
The servomotor dynamically controls the rotation timing and angle based on the lowering speed. During rapid lowering, the system adjusts the rotation to ensure proper alignment, preventing impact-induced thread overriding and filling liquid spill while maintaining high capping speed.
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 approach effectively suppresses 'thread overriding' and prevents contamination of the cap and container, enhancing the reliability and durability of the capping process.
Implementation Method 1
The cap is rotated while being lowered to cover a container with the cap, through advancement of a rotation start timing for rotating a servomotor, thereby, impact from engagement between a threaded portion of the cap and a threaded portion of a mouth of the container can be alleviated
Data Source
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AI summary
Occurrence of "thread overriding" during attachment of a cap to the resin container, which is a phenomenon in which a lower end of a threaded portion of the cap being lowered overrides the first thread and reaches the second thread of a threaded portion of the container, is suppressed. In a case of attaching a cap 8 to a mouth 5C of a container 5 by a capping head 3 while conveying the container 5 at a predetermined operation speed (850 bpm), rotation of a servomotor 12 is started to rotate the cap 8 in a fastening direction in the middle of lowering the capping head 3 (at a point X1), prior to contact between threaded portions of the cap 8 and the container 5. And then, a lower end 8A' of a threaded portion 8A of the cap 8 being lowered while being rotated is brought into contact and smoothly engaged with the threaded portion 5D of the container 5 while rotating, thus enabling suppression of occurrence of "thread overriding". Consequently, prevention of the contamination of an inner face of the cap 8 and the threaded portions 8A, 5D is enabled through suppression of spill of a filling liquid due to impact of the "thread overriding".