Leno Device Transmission Mechanism for High-Speed Weaving
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Solution Overview
Problem
Current leno devices restrict operating speed, leading to low productivity and high costs in producing leno fabrics, limiting their use due to the need for slower weaving speeds.
Innovation Solution
A leno device with a transmission mechanism that connects the half shaft to the lifting shafts, using a link mechanism with a connecting rod and guide rods to derive smooth, high-speed movement without additional devices on the dobby, ensuring a positive-locking drive and adjustable configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a spring-biased yoke with pull shafts is used to drive the half shaft, then the leno device can operate, but the operating speed is restricted to 150-250 wefts per minute
Solution Approach 1:
The patent replaces the traditional spring-biased yoke mechanical system with a transmission mechanism comprising a connecting rod and two guide rods. This new mechanical system eliminates the speed restrictions of the old system while maintaining the leno device's core functionality, enabling operation at substantially higher weft speeds.
Solution Approach 2:
The transmission mechanism allows the half shaft to perform smooth, dynamically controlled movements through the coordinated action of the connecting rod and guide rods. The system transitions from the static, spring-biased operation to a dynamically controlled positive-locking drive that can accommodate high-speed operation with continuously differentiated path/time curves.
2Reliability
If the half shaft is driven by spring-biased yoke, then the device can function, but shock-free operation at high speeds cannot be achieved
Solution Approach 1:
The transmission mechanism is designed to preemptively manage forces and movements, ensuring shock-free operation before high-speed conditions are reached. The connecting rod and guide rods are configured to distribute and smooth out forces throughout the operating cycle, preventing shocks and jerks even at elevated speeds.
Solution Approach 2:
The connecting rod acts as an intermediary element between the lifting shafts and the half shaft, mediating the transmission of motion in a controlled manner. This intermediary mechanism ensures that movements are transferred smoothly without direct冲击, enabling reliable high-speed operation.
3Speed
If additional devices are added to the dobby to achieve high speeds, then operating speed can increase, but device complexity increases
Solution Approach 1:
The transmission mechanism serves multiple functions simultaneously: it drives the half shaft, ensures positive-locking engagement, provides shock-free operation, and maintains compatibility with existing lifting shaft mechanisms. This multi-functionality eliminates the need for separate additional devices on the dobby, achieving high speeds without proportionally increasing complexity.
Solution Approach 2:
The patent merges the driving function for the half shaft into the existing lifting shaft system through the transmission mechanism. Rather than adding a completely separate drive system to the dobby, the invention integrates the high-speed capability into the existing structure, combining functions to minimize overall complexity.
Data Source
AI summary
A leno device uses the link mechanisms (31, 31′) to derive the movement of its half shaft (28) from the movement of its pull or lifting shafts (2, 3). The link mechanisms (31, 31′) connect the shaft rods (4, 5) of the pull or lifting shafts (2, 3) to the half shaft (28), whereby a connecting rod (32, 32′) extends between the two pull or lifting shafts (2, 3) from the top to the bottom through said shafts. The upper end of the connecting rod (32, 32′) is connected, on both sides of the connecting rod (32 32′) via connecting levers (33, 34, 33′ 34′), to the joints (36, 37, 36′, 37′) that are connected to the upper shaft rods (4, 5) of the pull or lifting shafts (2, 3).