Needle Bar Steering Rod Guide Mechanism for Horizontal Stroke
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Solution Overview
Problem
Existing devices for needling fiber webs face challenges in achieving flexible amplitude adjustment and stable guidance of superimposed vertical and horizontal movements, leading to insufficient stability and guidance, especially at higher throughput speeds.
Innovation Solution
A device with a guide device featuring a steering rod connected to the beam support via a rotary joint and coupled to a steering gear, allowing for flexible guideways and absorption of shear forces, combined with a phase adjustment device using servomotors for precise control of crankshaft phases, enabling larger horizontal strokes and stable movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a guide rod guided in a guide bushing with swivel bearing is used, then the needle bar can be tilted to achieve horizontal movement, but the horizontal stroke is limited due to excessive tilt requirements
Solution Approach 1:
A steering rod is introduced as an intermediary element between the beam support and the steering gear. The steering rod transmits the steering motion from the steering gear to the beam support, enabling precise control of the beam support's position and orientation without requiring excessive tilt of the guide bushing, thus achieving larger horizontal strokes while maintaining guidance stability
Solution Approach 2:
The traditional guide rod and guide bushing system is replaced with a steering gear and steering rod mechanism. This substitution allows for more flexible and precise control of the beam support's movement, enabling larger horizontal strokes while maintaining stable guidance through the steering gear's gear teeth engagement
2Length of moving object
If separate horizontal and vertical drives are used, then larger horizontal movement amplitudes are achieved, but the mechanics become complex and stability decreases at higher throughput speeds
Solution Approach 1:
The horizontal and vertical movement functions are merged into a single integrated guide mechanism. The steering gear simultaneously controls both the horizontal positioning and vertical guidance of the beam support through its gear teeth engagement with the steering rod, eliminating the need for separate drives and maintaining stability at high speeds
Solution Approach 2:
The steering gear serves multiple functions: it provides horizontal positioning, vertical guidance, and phase adjustment capability all through one mechanism. This multi-functional design reduces the overall system complexity while maintaining the ability to achieve large horizontal movement amplitudes
3Adaptability or versatility
If the beam support is tilted via swivel bearing to achieve horizontal movement, then the needle bar can move horizontally, but the guide path is limited by the fixed position of the swivel bearing
Solution Approach 1:
The guide mechanism is made dynamic and adjustable through the steering gear's ability to change the steering rod's orientation. The steering rod can be rotated to different angles depending on the required phase adjustment, allowing the beam support to achieve various horizontal stroke lengths while maintaining stable guidance throughout the movement range
Data Source
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AI summary
An apparatus is described for needling a fibrous web having at least one needle bar. On its underside, the needle bar carries a needle board with a multiplicity of needles, wherein the needle bar is guided via a movably held bar carrier. The bar carrier is driven in an oscillating manner with a superimposed horizontal and vertical movement by a crank mechanism drive. To this end, a phase shifting device is provided, by which the crankshafts of the crank mechanism drive can be adjusted depending on the phase relation. Here, the movement of the bar carrier is guided by a guide device. In order to obtain stable guidance with high flexibility in every situation, according to the invention the guide device is formed by a steering rod which is connected at one end to the bar carrier by a rotary joint and which is coupled with the other end to a steering gear by a second rotary joint.