Machine Knitting Needle Shank Design for Jerky Acceleration Damping
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Solution Overview
Problem
Machine knitting tools face challenges in achieving high acceleration while maintaining precise guidance and longevity, as they are prone to wear and damage from jerky accelerations and contamination, which affects productivity and stitch formation accuracy.
Innovation Solution
A machine knitting tool with a shank design featuring a closed underside and side faces, rib portions of limited height to reduce weight and absorb oscillations, and support elevations to distribute loads and prevent tilting, ensuring high-speed knitting and resistance to contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high movement speeds and accelerations are used to achieve high productivity, then knitting productivity is improved, but the machine knitting tool is subjected to jerky accelerations that cause wear and damage
Solution Approach 1:
The patent applies beforehand cushioning by providing a guide portion with a guide face that receives and cushions the acceleration forces before they reach the machine knitting needle. The guide channel and guide portion are designed to absorb and distribute the jerky accelerations, protecting the needle from damage while maintaining high movement speeds for productivity
2Speed
If the machine knitting tool mass is reduced to enable high accelerations, then acceleration capability is improved, but the tool becomes more susceptible to damage from acceleration forces
Solution Approach 1:
The patent introduces an intermediary guide portion that acts as a mediator between the cam-driven acceleration forces and the machine knitting needle. This guide portion with its guide face distributes and softens the acceleration forces, allowing lightweight needles to achieve high accelerations without being susceptible to damage
3Manufacturing precision
If the machine knitting tool is positioned precisely for accurate stitch formation, then stitch accuracy is improved, but the positioning is impaired by remaining yarns and contaminants
Solution Approach 1:
The patent applies taking out by providing a closed guide portion that extracts and isolates the machine knitting needle from contaminants such as remaining yarns and fibres. The closed structure with guide face creates a protected environment that maintains precise positioning while preventing contaminant interference
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 design enables high-speed knitting with reduced risk of needle breakage and increased service life, maintaining precise guidance and accuracy by effectively damping jerky accelerations and preventing contamination accumulation.
Implementation Method 1
rib portions of limited height to reduce weight and absorb oscillations
Implementation Method 2
effectively damping jerky accelerations
Data Source
AI summary
A machine knitting tool and in particular a machine knitting needle has a shank extending in the longitudinal direction. The machine knitting tool has a stitch-forming portion directly adjacently to a front end and a drive portion directly adjacently to a rear end. At least in the drive portion, an underside of the shank does not have any indentations or recesses and extends along a plane. The shank in the drive portion forms at least one rib portion with a rib height, which is at most 1.1 mm. In addition, the shank in the drive portion forms at least one support elevation, which extends in the height direction beyond the rib height of the at least one rib portion and has an elevation height at its point of maximum height.