Warp Knitting Machine Bar Positioning via Sensor Feedback
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Solution Overview
Problem
Warp knitting machines face issues with collisions between guide needles and knitting needles due to division problems, leading to damage and substandard fabric quality, which affects productivity and requires costly repairs.
Innovation Solution
A sensor arrangement with a switch and control device is used to determine the precise positioning of guide needles relative to knitting needles, preventing collisions by adjusting the movement of the guide bar, ensuring optimal positioning and maintaining fabric quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the guide bar is positioned very precisely to prevent collisions between guide needles and knitting needles, then the reliability of the knitting process is improved, but the device complexity increases due to the need for precise positioning systems
Solution Approach 1:
The patent replaces complex mechanical positioning systems with a sensor-based detection system. Electrical sensors detect the position of the guide bar relative to the knitting needles and provide feedback to a control device, which adjusts the positioning accordingly. This substitution of mechanical precision requirements with electrical sensing reduces mechanical complexity while maintaining reliability.
Solution Approach 2:
The patent implements a feedback control system where sensors continuously monitor the position of the guide bar and knitting needles, and the control device adjusts the guide bar positioning based on this feedback. This closed-loop control ensures reliable collision prevention without requiring inherently precise mechanical positioning, thereby reducing device complexity.
2Measurement precision
If camera-based sensor arrangements are used to monitor the position of knitting tools, then the measurement precision is improved, but the device complexity and cost increase
Solution Approach 1:
The patent employs simple, inexpensive electrical sensors (such as capacitive or inductive sensors) instead of expensive camera systems. These sensors provide sufficient measurement precision for detecting the approach between knitting tools while being much cheaper and simpler to implement. The sensors can be easily replaced if needed, aligning with the disposable/replaceable approach.
Solution Approach 2:
The patent replaces optical measurement systems (cameras) with electrical sensing systems. The electrical sensors directly detect the position and approach of knitting tools through electrical fields or capacitive coupling, providing adequate measurement precision without the complexity and cost of optical systems.
3Productivity
If the guide needles are moved through narrow needle lanes between knitting needles, then the productivity is improved by maintaining continuous operation, but the risk of collisions and damage increases
Solution Approach 1:
The patent uses sensors to detect the approach between guide needles and knitting needles before actual contact occurs. The control device receives this advance warning and can take preliminary action to adjust the guide bar position or slow down the movement, preventing collisions before they happen. This allows continuous operation to proceed safely without the constant risk of damage.
Solution Approach 2:
The patent implements real-time feedback monitoring of the needle positions during continuous operation. The sensors continuously provide information about the gap between guide needles and knitting needles, and the control device adjusts the system in real-time to maintain safe distances, enabling continuous high-speed operation without increasing collision risk.
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 effectively prevents collisions and ensures consistent fabric quality by accurately determining the approach between guide and knitting needles, reducing noise and maintenance costs while maintaining high productivity.
Implementation Method 1
the sensor arrangement has an electrical circuit with a switch which has at least one sensor knitting tool as the switching element
Data Source
Figure 1~2b
AI summary
A warp knitting machine (1) is described, comprising at least one first bar (2) carrying first knitting tools (3, 3a) and at least one second bar (4) carrying second knitting tools (5, 5a, 5b), wherein the first bar (2) can be displaced in an offset direction (7) relative to the second bar (4) by means of an offset drive (6). The aim is to achieve high productivity with the warp knitting machine. For this purpose, a sensor arrangement (8) is provided which determines the position of the first bar (2) at a predetermined approach between the first knitting tools (3, 3a) and the second knitting tools (5, 5a, 5b).