Knitting Sinker Force Compensation Mechanism
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Solution Overview
Problem
Conventional sinkers in knitting machines experience unwanted movements due to stitch-forming forces, leading to irregularities in the knitted fabric, such as sinker stripes, and increased wear, which affects the uniformity and quality of the fabric over the machine's service life.
Innovation Solution
A sinker design featuring a shaft with a loop-forming means and a sliding surface, combined with a force-exerting couple comprising a spring element and a contact surface, which compensates for stitch-forming forces and stabilizes the sinker during knitting operations, preventing unwanted vertical movements and reducing wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sinkers are used without additional force compensation, then the device complexity is low, but the sinker position stability deteriorates due to unwanted height movements caused by stitch-forming forces
Solution Approach 1:
A spring element is introduced as an intermediary component between the sinker and the needle carrier. This spring element acts as a mediator that absorbs and compensates for the stitch-forming forces, preventing direct transmission of these forces to the sinker body and thus stabilizing the sinker position without requiring fundamental redesign of the sinker structure
Solution Approach 2:
The spring element is pre-installed on the sinker shaft to provide beforehand cushioning against the stitch-forming forces. This pre-compression arrangement ensures that when knitting forces act on the sinker, the spring is already positioned to absorb these forces, preventing unwanted sinker movements before they can cause fabric irregularities
2Manufacturing precision
If the sinker is designed to counteract stitch-forming forces with a spring element, then the uniformity of knitted fabric is improved, but the manufacturing complexity increases
Solution Approach 1:
The sinker is segmented into functional components: the shaft, the holding-down edge, the knock-off edge, and the separately attachable spring element. This segmentation allows the spring element to be manufactured and calibrated independently, then mounted on the sinker, simplifying the overall manufacturing process while ensuring precise force compensation for uniform fabric production
Solution Approach 2:
The spring element's physical parameters (such as spring constant, pre-compression force, and deflection characteristics) are specifically designed and adjusted to match the stitch-forming forces encountered during knitting. By optimizing these parameters, the spring provides precise force compensation that ensures uniform knitted fabric without requiring complex manufacturing processes
3Strength
If sinkers experience vertical movements due to stitch-forming forces, then the device structure remains simple, but the wear in contact areas increases
Solution Approach 1:
The spring element serves as a protective intermediary between the stitch-forming forces and the sinker contact areas. By absorbing these forces, the spring prevents direct repetitive loading on the sliding surfaces and contact points, significantly reducing wear and extending the service life of the sinker without complicating the overall device structure
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 a uniform stitch pattern throughout the machine's service life by stabilizing the sinker and reducing mechanical load, thereby minimizing irregularities and wear, resulting in a consistently high-quality knitted fabric.
Implementation Method 1
the circuit board includes a first partial element of a pair of effects for exerting a force that acts in the direction of the height of the plate, with the pair of effects preferably including at least one spring element
Implementation Method 2
the sinker has at least one basic sliding surface, and this basic sliding surface running in the longitudinal direction of the sinker
Data Source
Figure 1
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AI summary
A knitting device (14) with a card (1) and a method that enables the production of a knitted fabric with a uniform stitch pattern throughout its entire service life comprise a pair of elements (6, 18). This pair of elements allows a downward force (7) to be exerted on the card (1) in the card height direction (H). This force (7) can counteract stitch-forming forces acting on the stitch-forming elements (3) of the card (1) during knitting operation, thus preventing irregularities – for example, card stripes – in the knitted fabric produced.