Flat Knitting Machine In-and-Out Cam Vibration Control
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Solution Overview
Problem
In flat knitting machines, a wide gap between the rising and lowering inclined planes can cause the knitting operation butt to vibrate, leading to uneven yarn drawing and quality issues when the knitting speed is increased, affecting the finish of the knitted fabric.
Innovation Solution
The introduction of in-and-out cams between the rising and lowering inclined planes, which can freely move in a direction orthogonal to the cam plate, helps stabilize the knitting operation butt by guiding it and reducing vibrations, using an electromagnetic or mechanical drive mechanism and an elastic body for control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the gap between the rising inclined plane and the lowering inclined plane is widened to adjust timing and reduce impact, then the knitting operation butt can move smoothly with reduced wear, but the knitting operation butt vibrates and jumps when the carriage speed is increased, causing uneven yarn drawing
Solution Approach 1:
A guide cam is introduced as an intermediary element between the rising inclined plane and the lowering inclined plane. The guide cam provides a guiding surface that constrains the knitting operation butt during its movement, preventing lateral vibration and jumping while maintaining the necessary gap for timing adjustment and impact reduction.
Solution Approach 2:
The guide cam is designed with a specific profile that dynamically adapts to the knitting operation butt's movement requirements. The cam surface provides increasing guidance constraint as the butt transitions from the rising to the lowering inclined plane, stabilizing the butt during high-speed operation while allowing smooth passage during low-speed operation.
2Strength
If the inclination angle of the rising inclined plane is made gradual to reduce impact and wear, then the knitting operation butt experiences reduced wear, but the overall structure becomes more complex and the timing adjustment requires larger space
Solution Approach 1:
The guide cam is merged with the existing cam system structure, integrating the guidance function into the overall cam assembly. This combination allows the gradual inclination angle for wear reduction to be achieved without significantly increasing structural complexity, as the guide cam works in conjunction with the rising and lowering inclined planes rather than adding a completely separate mechanism.
3Productivity
If the carriage speed is increased to improve production efficiency, then the productivity of the knitting machine increases, but the knitting operation butt vibrates and jumps causing uneven yarn drawing and quality issues
Solution Approach 1:
The guide cam acts as a mediator that maintains manufacturing precision during high-speed operation. By providing a guiding surface that constrains the knitting operation butt, the guide cam prevents vibration and jumping even when the carriage moves at high speed, thereby ensuring uniform yarn drawing and maintaining fabric quality.
Solution Approach 2:
The dynamic design of the guide cam profile provides increasing stabilization as the knitting operation butt passes through the critical transition zone. This dynamic guidance ensures that even at high carriage speeds, the knitting operation butt follows the intended path accurately, maintaining yarn drawing uniformity and enabling high productivity without quality compromise.
Data Source
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AI summary
A flat knitting machine capable of suppressing a vibration of a knitting operation butt when the knitting operation butt comes into contact with a lowering inclined plane is provided. The flat knitting machine is provided with a cam system including a cam plate 100, a needle raising cam 2, a bridge cam 3, and a stitch cam 4, and is further provided with a pair of in-and-out cams 1. Each in-and-out cam 1 is configured to freely go in and out from the cam plate between a rising inclined plane 8 and a lowering inclined plane 9. The in-and-out cam 1 is in an in-state so as not to inhibit movement of the knitting operation butt 70 on a side where the knitting operation butt 70 is raised by the rising inclined plane 8, and is in an out-state so as to make an up and down vibration margin of the knitting operation butt small at a guide inclined plane 10 facing a rear end of the knitting operation butt 70 on a side where the knitting operation butt 70 is lowered by the lowering inclined plane 9.