Travelling-Head Tuck-In Leverage Mechanism for Weaving Looms
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Solution Overview
Problem
Existing tuck-in devices for weaving machines with fixed working heads face mechanical interference issues due to reed width limitations, and travelling-head devices require complex cam systems and pneumatic or electric actuators for weft cutting, leading to reliability and maintenance challenges.
Innovation Solution
A control leverage mechanism for travelling-head tuck-in devices that eliminates the need for cylindrical guides and cam systems, using an articulated quadrilateral mechanism to generate alternate motion and integrates an electrical servocontrol for weft cutting, reducing maintenance and operational complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed working head is used in tuck-in devices, then the device structure is simpler, but mechanical interference occurs with the reed when working on full-width looms
Solution Approach 1:
The working head is made movable along the warp direction through a control leverage mechanism, transforming it from a fixed static component to a dynamic one that can adjust its position to avoid interference with the reed while maintaining simplicity in the overall device structure
2Object-affected harmful factors
If a travelling working head is used to avoid reed interference, then mechanical interference is eliminated, but the device complexity increases due to cam systems and articulated mechanisms
Solution Approach 1:
The control mechanism is segmented into distinct functional components: a first articulated quadrilateral for taking movement from the sley, a connecting rod-crank mechanism for motion transformation, and an articulated parallelogram for guiding the travelling head. This segmentation allows each component to perform its specific function efficiently while maintaining overall system manageability
3Ease of operation
If pneumatic or electric actuators are used for weft cutting, then cutting control is improved, but reliability decreases due to maintenance requirements
Solution Approach 1:
The weft cutting function is integrated into the mechanical leverage mechanism itself, allowing the cutting device to be actuated by the same mechanical motions that control the travelling head. This self-service approach eliminates the need for separate pneumatic or electric actuating systems, thereby improving reliability while maintaining operational control
4Manufacturing precision
If cylindrical guides are used for travelling-head movement, then movement precision is improved, but maintenance needs increase
Solution Approach 1:
The cylindrical guides are completely removed from the mechanism. Instead, the travelling head's movement is achieved through the articulated parallelogram mechanism, which provides precise motion control through its geometric constraints without requiring separate guiding components, thereby eliminating the maintenance associated with cylindrical guides
Data Source
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AI summary
A control leverage mechanism of a travelling-head (T) tuck-in device for a weaving loom characterized in that it comprises a first articulated quadrilateral (Q1), whose end hinges (1, 2) are fixed to the loom, which takes the alternate movement from the loom sley (S) and transfers said alternate movement, suitably modulated, to a terminal lever (L2) hinged to one of said end hinges (2), said terminal lever (L2) integrally carrying said travelling-head (T) of the tuck-in device.