Loom Operating Device Blank Beating Control
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Solution Overview
Problem
Existing loom starting methods fail to prevent weft bars and ensure proper fabric quality, especially when using yarns with great stretching properties, due to issues with reverse rotation causing weft slackness and limited flexibility in setting blank beating parameters.
Innovation Solution
An operating device for the loom that allows for manual setting of parameters for low-speed normal rotation and blank beating processes, enabling adjustment of their durations and ensuring proper alignment with the weaving pattern, thereby preventing weft bars and maintaining fabric quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the main shaft is rotated reversely to a predetermined position before starting, then the loom can be positioned correctly for operation, but the warp shedding and selvage yarn constraint during reverse rotation cause weft slackness and fabric defects
Solution Approach 1:
Instead of rotating the main shaft in reverse direction to position it, the patent rotates the main shaft in the normal forward direction to a predetermined position before starting operation. This inversion of the rotation direction eliminates the harmful effects of reverse rotation on weft yarn tension while still achieving accurate positioning.
Solution Approach 2:
The patent performs preliminary positioning of the main shaft to a predetermined position before starting the weaving operation. By positioning the main shaft in advance in the normal rotation direction, the system prepares the loom for operation without introducing weft slackness, and then performs blank beating to further ensure proper fabric formation.
2Ease of operation
If the number of blank beatings is limited to once after starting, then the starting process is simplified, but there is insufficient flexibility to eliminate weft bars for different fabric requirements
Solution Approach 1:
The patent makes the number of blank beatings dynamically adjustable rather than fixed at once. The control unit can set the number of blank beatings according to different fabric types and requirements, allowing the system to adapt between simple one-time blank beating for basic fabrics and multiple blank beatings for fabrics requiring stricter quality control.
Solution Approach 2:
The patent changes the parameter of blank beating count from a fixed value to a variable that can be adjusted based on fabric requirements. By allowing the number of blank beatings to be modified, the system can optimize fabric quality for different yarn types and fabric structures while maintaining operational simplicity through automated control.
3Productivity
If the main shaft rotates at normal speed during starting, then the starting process is faster, but the beating force is insufficient to prevent weft bars
Solution Approach 1:
The patent implements periodic action by performing multiple blank beatings at normal speed after starting, rather than a single beating. This periodic repetition of the blank beating process ensures sufficient beating force is applied to prevent weft bars while maintaining the overall fast starting speed enabled by normal-speed rotation.
Solution Approach 2:
The patent maintains continuous useful action by performing blank beatings consecutively at normal speed without interruption. This continuous series of blank beatings ensures that the fabric formation process receives adequate beating force throughout the starting phase, preventing weft bars while keeping the loom operating at high speed.
Data Source
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AI summary
An operating device of a loom comprises a setter for setting at least one parameter, and a controller which, when an operation signal is inputted, makes the loom perform a low-speed normal rotation process for normally rotating the main shaft of the loom at a low speed and then a blank beating operation process without accompanying weft insertion while actuating the loom, and subsequently, shifting the loom to an ordinary operation process accompanying weft insertion. In the setter, it is possible to manually set the termination time of at least one of the low-speed normal rotation process and the blank beating operation process as the parameter.