Linear Actuator for Tufting Machine Needle Bar
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Solution Overview
Problem
Conventional tufting machines face limitations in achieving high-speed and accurate reciprocating motion of needle bars due to the use of servo motors and ball screws, which result in reduced productivity and require frequent maintenance.
Innovation Solution
A linear actuator with a magnet unit and coil unit configuration that enables high-speed and accurate reciprocation of the magnet mounting plate through magnetic forces, eliminating the need for a ball screw and reducing maintenance efforts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a servo motor and ball screw are used to reciprocate the needle bar, then the reciprocating movement can be achieved with controlled speed and position, but the speed is limited and the ball screw wears out requiring frequent maintenance
Solution Approach 1:
The patent replaces the mechanical ball screw system with a magnetic field-based linear actuator system. The coil unit generates a magnetic field that interacts with the magnet unit to directly drive reciprocating motion without mechanical contact, eliminating wear and maintaining high speed capability
Solution Approach 2:
The patent uses electromagnetic fields (analogous to pneumatic/hydraulic systems in that they are non-contact force transmission media) to transmit force from the coil unit to the magnet unit, enabling wear-free high-speed reciprocating motion
2Productivity
If the reciprocating speed of the needle bar is increased, then productivity improves, but the servo motor cannot maintain position accuracy and stops
Solution Approach 1:
The patent replaces the servo motor and ball screw mechanical system with a magnetic field-based system where the coil unit can rapidly generate and reverse magnetic fields, enabling high-speed reciprocating motion while maintaining precise position control through electromagnetic field management
3Ease of operation
If a ball screw is used to convert rotational movement to reciprocating movement, then motion conversion is achieved, but the ball screw is prone to wear and requires replacement
Solution Approach 1:
The patent eliminates the mechanical ball screw entirely by using a linear actuator where electromagnetic forces directly produce reciprocating motion. The magnet unit moves linearly in response to magnetic field changes from the coil unit, achieving motion conversion without mechanical wear components
Solution Approach 2:
The magnetic field-based system requires no maintenance as the electromagnetic components (coil unit and magnet unit) have no wear parts. The system is self-sustaining without requiring replacement of consumable components like ball screws
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
The linear actuator enhances the productivity of tufting machines by allowing higher speed and accuracy in needle bar reciprocation, reducing maintenance needs, and enabling the production of complex patterns with increased efficiency.
Implementation Method 1
Based on magnetization and demagnetization of the coil unit, the magnet unit reciprocates between the coil units
Implementation Method 2
the magnet unit reciprocates between the coil units. Based on magnetization and demagnetization of the coil unit, the magnet unit reciprocates between the coil units
Data Source
AI summary
A linear actuator, and a tufting machine including the linear actuator are provided. The linear actuator includes a casing, a magnet unit, and a coil unit. The magnet unit includes a magnet and a magnet mounting plate. The magnet is configured to sandwich side surfaces of the magnet mounting plate. The coil unit faces the magnet. The magnet unit is configured to reciprocate along an axial direction in the casing, between the coil unit, based on magnetization and demagnetization of the coil unit.