Eccentric Guide Bar Drive for Warp Knitting Machines
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Solution Overview
Problem
Existing guide bar drives for warp knitting machines require significant mechanical effort due to the use of gear systems with threaded spindles and ball screw nuts, making precise control and efficient movement challenging.
Innovation Solution
A guide bar drive system utilizing a motor arrangement with a drive ram acting as a connecting rod, featuring a pin eccentrically mounted on the output element engaging with a drive tappet, and a barrel bearing to compensate for misalignments, allowing for precise translational movement with reduced mechanical effort, and optionally including a movement limiting device and anti-twist mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a motor assembly with threaded spindle and ball screw nut is used to drive the laying bar, then precise control of the laying bar movement is achieved, but the mechanical complexity increases significantly
Solution Approach 1:
The patent extracts and eliminates the threaded spindle and ball screw nut from the drive system, retaining only the essential motor assembly and connecting rod components. This removal of unnecessary mechanical elements reduces complexity while preserving the core function of converting rotational motor movement into linear laying bar movement.
Solution Approach 2:
The patent replaces the complex mechanical transmission system (threaded spindle and ball screw nut) with a simpler direct-drive connecting rod mechanism. The motor assembly directly actuates the connecting rod, which in turn moves the laying bar, substituting intricate mechanical gearing with a more straightforward mechanical linkage.
2Manufacturing precision
If a threaded spindle with ball screw nut is used for driving the laying bar, then precise translational movement is achieved, but the mechanical effort required increases
Solution Approach 1:
The patent removes the threaded spindle and ball screw nut components that were previously necessary for achieving precise translational movement. Instead, it uses a simplified connecting rod mechanism that directly translates motor rotation into linear motion, reducing the mechanical effort required while maintaining precision through proper linkage geometry.
3Adaptability or versatility
If multiple motors are arranged side by side in offset direction to drive laying bars, then individual control of laying bars is achieved, but the installation space requirement increases
Solution Approach 1:
The patent merges the drive functions for multiple laying bars into a more compact configuration. By optimizing the arrangement of motor assemblies and connecting rods, multiple drive units can be positioned closer together, reducing the overall installation space while preserving the ability to individually control each laying bar through independent motor actuation.
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
Enables precise control of the guide bar movement in the offset direction with reduced mechanical effort, eliminating the need for a return spring arrangement and optimizing the use of installation space, while maintaining alignment and minimizing loads on bearings.
Implementation Method 1
A barrel bearing is positioned between the pivot and the eye. This barrel bearing is a rolling bearing with crowned rolling elements, capable of compensating for misalignment between the axis of rotation and the pivot axis.
Data Source
Figure 1~3
Figure 4~5
AI summary
A laying bar drive (6) for a warp knitting machine is described, comprising a motor arrangement (8) with a rotary-driven output element (12) that has a rotational axis and interacts with a drive plunger (5). The aim is to be able to individually control a laying bar in the offset direction with minimal effort. For this purpose, a functional connection between the output element (12) and the drive plunger (5) is arranged eccentrically to the rotational axis.