Loom Weft Yarn Measuring Roller Friction Resistance
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Solution Overview
Problem
The existing weft yarn measuring and storing devices in looms experience separation of the pressing roller at high speeds, leading to insufficient yarn measurement and increased frequency of roller replacements due to the wear of rubber coatings, which is costly and inefficient.
Innovation Solution
A weft yarn measuring and storing device with a support lever and drive roller system, where a friction resistance mechanism, such as a wave washer or coil spring, is used to maintain contact between the feed roller and drive roller, preventing separation and reducing the need for frequent roller replacements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the spring force is increased to prevent pressing roller separation at high speeds, then the roller contact stability is improved, but the rubber coating service life is significantly shortened
Solution Approach 1:
The pressing roller is divided into two separate components: a metal core roller and a replaceable rubber coating. This segmentation allows the metal core to bear the high spring force without wear, while the rubber coating can be replaced independently when worn, resolving the contradiction between maintaining stable contact and extending service life.
Solution Approach 2:
The rubber coating is designed as a disposable or replaceable component with lower cost, allowing frequent replacement without significant expense. This enables the system to maintain high spring force for reliability while accepting that the rubber coating will wear and need replacement, rather than replacing expensive integrated rollers.
2Productivity
If the loom operating speed is increased to improve productivity, then the manufacturing output is improved, but the pressing roller separates from the measuring portion causing measurement errors
Solution Approach 1:
The support lever is designed to be movable rather than fixed, allowing it to dynamically adjust its position in response to centrifugal forces at different operating speeds. This dynamic adjustment maintains optimal pressing roller contact with the measuring portion across a range of speeds, preserving measurement accuracy while enabling high-speed operation.
Solution Approach 2:
The system allows the pressing force parameter to be optimized for high-speed operation while maintaining measurement accuracy. By adjusting the spring force and support lever geometry, the pressing roller maintains sufficient contact pressure even at high speeds, preventing separation and ensuring accurate weft yarn measurement throughout the speed range.
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 device effectively prevents weft yarn insertion failures by maintaining stable contact between the rollers at high speeds, extending the lifespan of the rollers and reducing replacement costs without complex modifications.
Implementation Method 1
a feed roller that is rotatably mounted to the support lever and pressed to be contacted against the drive roller by a spring force
Implementation Method 2
a friction resistance imparting portion that imparts the support lever a friction resistance against turning of the support lever
Data Source
AI summary
A weft yarn measuring and storing device of a loom includes a drive roller, a support shaft, a support lever is turnably mounted to the support shaft, a feed roller that is rotatably mounted to the support lever and pressed to be contacted against the drive roller by a spring force so that the feed roller is rotated by rotation of the drive roller to pinch a weft yarn therebetween for feeding, and a storing drum that takes up and stores the fed weft yarn. The weft yarn measuring and storing device further includes a friction resistance imparting portion that imparts the support lever a friction resistance against turning of the support lever.