Mechanical Needle Selection for Double-Needle-Cylinder Hosiery Machine
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Solution Overview
Problem
Existing double-needle-cylinder hosiery machines face issues with electromagnetic interference and high failure rates in their needle selection mechanisms, particularly due to the reliance on electromagnetic control for needle selection.
Innovation Solution
The mechanism employs a mechanical structure for needle selection, utilizing an electromagnetic unit housed within a shielded compartment to prevent electromagnetic interference, with moving components constrained in axial and radial grooves for reliable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If electromagnetic control is used for needle selection, then automation is improved, but electromagnetic interference and failure rate increase
Solution Approach 1:
The patent replaces electromagnetic control with a mechanical selection system. The selector operates mechanically to engage or disengage the connecting element, which in turn controls the needle guide piece. This mechanical substitution eliminates electromagnetic interference and improves reliability while maintaining automation through the mechanical actuation mechanism.
2Extent of automation
If electromagnetic control is used for needle selection, then automation is improved, but electromagnetic interference increases
Solution Approach 1:
The patent eliminates electromagnetic interference by substituting the electromagnetic control system with a purely mechanical selection mechanism. The selector, connecting element, and needle guide piece form a mechanical transmission system that does not generate or respond to electromagnetic fields, thereby removing the harmful interference factor entirely.
3Ease of operation
If selector swings in radial direction to drive connecting element, then needle selection is achieved, but device complexity increases due to additional press and rod member
Solution Approach 1:
The patent merges the selector and connecting element into an integrated assembly where the selector directly engages the connecting element without requiring separate press and rod member components. This integration simplifies the mechanical structure while maintaining the needle selection function, reducing the number of parts and assembly 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 approach reduces electromagnetic interference and significantly lowers failure rates, ensuring smooth and reliable needle selection operations.
Implementation Method 1
an electromagnetic unit (4) arranged in the housing, through which a magnetic field is shielded
Data Source
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AI summary
The present invention discloses a lower needle selection device for a double-needle-cylinder hosiery machine. The lower needle selection device includes an upper needle cylinder, a lower needle cylinder (1) and a double-end latch needle, wherein a needle cylinder attached seat (2) is arranged at the lower part of the lower needle cylinder (1); a top surface of the needle cylinder attached seat (2) is provided with a plurality of radial grooves (21); an outer wall of the needle cylinder attached seat is provided with a plurality of axial grooves (22); a control piece (23) is arranged in each radial groove (21) in the top surface of the needle cylinder attached seat (2); a needle selection piece (24) is arranged in each axial groove (22) in the outer wall of the needle cylinder attached seat (2); the needle selection piece (24) slides vertically in the axial groove (22) in the outer wall of the needle cylinder attached seat (2) under the action of a driving mechanism and abuts against a tail end of the control piece (23); and a fixed cam (5), a radial pushing and pressing member (6) and an axial pushing and pressing member (7) are arranged on the top surface of the needle cylinder attached seat (2), such that the control pieces (23) are controlled respectively to move in order to achieve needle selection. According to the present invention, moving components are all restrained in axial grooves or radial grooves, with reliable actions and low failure rate, so needle selection can be well completed.