Bristle Cluster Separating Apparatus Variable Speed Control
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Solution Overview
Problem
Current bristle bundle separating devices in brush tufting machines operate at limited cycle rates due to inconsistent bristle filling, leading to high reject rates and inefficiencies, as previous attempts to increase cycles through drive frequency or pressing force did not ensure reproducible filling.
Innovation Solution
The method involves a drive frequency of at least 1100 cycles/minute with varying groove speeds and a dwell time greater than 10 milliseconds in the transfer area, utilizing a gear or high-speed direct current motor to achieve reproducible bristle filling, and optimizing the pivot axis and transfer tool path to reduce travel distance and cycle time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the drive frequency is increased to achieve higher cycle rates, then productivity increases, but the reproducibility of bristle filling deteriorates leading to high reject rates
Solution Approach 1:
The bundle collector is designed with variable speed movement, being slower in the transfer area to ensure complete and reproducible bristle filling, and faster in other areas to maintain high productivity. This dynamic speed variation resolves the contradiction by adapting the speed to the specific operational requirements of different zones.
Solution Approach 2:
The system changes the speed parameter of the bundle collector dynamically during its operational cycle. By reducing speed in the transfer area and increasing it elsewhere, the system achieves both high overall productivity and consistent filling quality, resolving the trade-off between cycle rate and filling reproducibility.
2Productivity
If the groove speed is increased to reduce cycle time, then productivity improves, but the dwell time in the transfer area decreases causing incomplete bristle loading
Solution Approach 1:
The bundle collector operates at variable speeds, being deliberately slower in the transfer area to provide sufficient dwell time for complete bristle loading, and faster in other areas to minimize overall cycle time. This dynamic adjustment resolves the contradiction between productivity and adequate dwell time.
Solution Approach 2:
The system employs periodic variation in the speed of the bundle collector, with slower phases during the critical transfer area operations and faster phases during other parts of the cycle. This periodic speed modulation ensures complete loading while maintaining high productivity.
3Manufacturing precision
If the pressing force of bundles against the edge of the bundle pickup is increased to improve filling, then manufacturing precision improves, but device complexity and energy consumption increase
Solution Approach 1:
Instead of using a complex pressing mechanism, the system achieves improved filling by dynamically adjusting the speed of the bundle collector. The slower speed in the transfer area naturally increases the pressing effect and ensures complete loading without requiring additional pressing components, thus avoiding increased device complexity.
Data Source
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AI summary
A method for operating a bristle‑cluster‑separating apparatus makes provision for the cluster remover (22) to be coupled to a drive (24) and for the drive to be moved at such a speed as to achieve a frequency of at least 1100 cycles/minute for the cluster removers (22) moving back and forth. The speed of the groove (32) for receiving the bristle clusters and the transfer region between the groove (32) and the bristle reservoir (14) are selected such that the residence time of the groove (32) in the transfer region per cycle is greater than 10 miliseconds, preferably 12 milliseconds. A description is also given of a bristle‑cluster‑separating apparatus.