Yarn Nipping Device for Flatbed Knitting Machine
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Solution Overview
Problem
In flatbed knitting machines, the existing gripping devices cause excessive tension in knitting yarns, leading to dense stitches or yarn breakage when gripping the yarn during the knitting process, which affects the quality of non-sewing products and can result in yarn breakage.
Innovation Solution
A knitting yarn gripping device equipped with a lock member and an unlocking mechanism, featuring a support part with swinging arms and a link mechanism, allows the gripping mechanism to capture and hold the yarn without excessive tension by locking during the rising phase and unlocking during the falling phase, ensuring secure grip and preventing yarn breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gripping device holds the knitting yarn during the knitting process, then the yarn can be securely gripped, but excessive tension is applied causing dense stitches or yarn breakage
Solution Approach 1:
The gripping mechanism dynamically changes its state between rising and falling phases. During the rising phase, the gripping force is reduced to prevent excessive tension, while during the falling phase, the gripping force is increased to securely hold the yarn. This dynamic adjustment resolves the contradiction between reliable gripping and preventing harmful tension.
Solution Approach 2:
The gripping device operates in periodic cycles of rising and falling movements. During the rising phase, the mechanism opens or reduces gripping force to allow yarn replenishment without tension. During the falling phase, it closes or increases gripping force to secure the yarn. This periodic action pattern prevents continuous excessive tension while ensuring secure gripping when needed.
2Reliability
If the gripping mechanism closes to hold the yarn, then the yarn is securely gripped, but the yarn cannot be replenished during the falling phase
Solution Approach 1:
The gripping mechanism dynamically adjusts its position and gripping force based on the phase of motion. During the rising phase, it opens to allow yarn replenishment. During the falling phase, it closes to secure the yarn. This dynamic behavior enables both yarn replenishment and secure holding at different times in the cycle.
Solution Approach 2:
The mechanism performs periodic opening and closing actions synchronized with the rising and falling phases. The opening phase allows yarn replenishment, while the closing phase secures the yarn. This periodic alternation ensures both productivity through replenishment and reliability through secure holding.
3Reliability
If the gripping device is designed to securely hold the yarn end, then the yarn can be reliably gripped, but the structure becomes more complex
Solution Approach 1:
The gripping mechanism combines multiple functions into a single integrated structure that performs both opening and closing actions through the rise and fall movements. The same structural elements that enable secure gripping also facilitate yarn replenishment, reducing the need for separate mechanisms and simplifying the overall device structure while maintaining reliability.
Data Source
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AI summary
There provided is a knitting yarn gripping device for a flatbed knitting machine that does not cause dense stitches or yarn breakage even when the knitting yarn is gripped. A lock lever 30 is energized by a wire spring 31 and when a head end of a short arm 30a comes in contact with a lock part 13a of a nip claw 13, nip claws 11, 13 and a nip claw 12 are locked on the way of closing. The lock lever 30 is supported by a connecting pin 32 that connects a top end of a small rod 15 to the nip claw 12 in a manner capable of swinging displacement with an intermediate portion between the short arm 30a and a long arm 30b serving as a support part. A top end of a small rod 16 is mutually connected by a connecting pin 33 while being sandwiched between the two nip claws 11, 13. Between head ends of the nip claws 11, 13 and the nip claw 12, a capturing space 10c is formed, and a knitting yarn is able to be pulled down in such a state that the knitting yarn is captured but is not gripped.