Rotary Dobby Latch Control for High Speed Operation
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Solution Overview
Problem
Existing rotary dobbies face limitations in operating speed due to high inertia in latch control elements, which restrict their performance and efficiency.
Innovation Solution
A rotary dobby design featuring two controlled latches with resilient bias means and control mechanisms that allow direct actuation of the driving latch while the loaded return latch remains engaged, enabling efficient decoupling and increased operating speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the latch control elements are dimensioned to accommodate intense forces during the driven stage, then the reliability of latch engagement is improved, but the inertia of the control elements increases and operating speed is limited
Solution Approach 1:
The invention divides the latch control system into two separate latches (first latch for driving stage, second latch for driven stage) that operate independently during different phases of the main shaft rotation. This segmentation allows each latch to be optimized for its specific function, with the first latch being lighter and faster while the second latch handles the intense forces during the driven stage.
Solution Approach 2:
The invention implements periodic action by having the first latch disengage during the driven stage when the second latch is engaged, and vice versa during the driving stage. This periodic alternation allows the control means to act on the first latch without needing to simultaneously overcome the intense forces acting on the second latch, thereby reducing the required control force and inertia.
2Speed
If the control means act powerfully and quickly on the latch to disengage it during the driven stage, then the decoupling speed is improved, but the required control force increases and the control elements must be heavily dimensioned
Solution Approach 1:
The invention utilizes periodic action by timing the disengagement of the first latch to occur during the driven stage when the second latch is engaged and bearing the intense forces. Since the latches operate in alternating phases, the control means only needs to overcome the relatively small resilient bias force of the first latch rather than the intense forces acting on both latches simultaneously, thereby reducing the required control force while maintaining fast decoupling speed.
3Reliability
If the resilient bias means act on both latches to maintain engagement, then the reliability of force transmission is improved, but the complexity of the control system increases
Solution Approach 1:
The invention segments the resilient biasing system into two independent bias means (first resilient bias means for the first latch, second resilient bias means for the second latch). Each bias means independently maintains engagement for its respective latch, ensuring reliable force transmission during both driving and driven stages without requiring a complex unified control mechanism.
Solution Approach 2:
Each latch is equipped with its own resilient bias means that automatically maintains engagement without requiring external control intervention. The first resilient bias means keeps the first latch engaged during the driving stage, while the second resilient bias means keeps the second latch engaged during the driven stage, allowing the system to self-regulate and reducing control complexity.
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
This design enhances the operating speed of the rotary dobby while maintaining reliability, allowing for higher speeds and improved performance compared to traditional systems.
Implementation Method 1
first resilient bias means for resiliently biasing each of the latches towards a configuration in which their respective bearing surfaces are engaged with the corresponding surfaces of the drive element
Data Source
AI summary
A dobby includes two controlled latches for coupling a drive element mounted to a main drive shaft of the dobby and an actuator element in rotation. A first resilient element resiliently biases each of the latches towards a configuration in which their respective bearing surfaces are engaged with corresponding surfaces of the actuator element. Control members are provided for moving the latches against the action of the first resilient element and that act directly on the first latch and indirectly on the second latch so as to move the first latch against the first resilient element to thereby disengage its bearing surface with a corresponding surface of the actuator element while the second latch remains in a configuration in which its bearing surface is engaged with another corresponding surface of the actuator element.