Drawing Frame Guide Apron Gap Control
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Solution Overview
Problem
Existing drafting systems for textile machines face issues with non-uniformity in fiber structure and damage from drag flow caused by high-speed rollers, where the guide apron is prone to contact and damage due to a variable gap between the apron and the rollers, leading to inconsistencies in fiber drafting.
Innovation Solution
The first lower roller is mounted in a bearing carriage that can be displaced in the transport direction, with the second lower roller in a fixed bearing block, ensuring a constant and minimal gap between the guide apron and the rollers, and an exchangeable guide table element allows for adaptation to different fiber structures without altering the gap, using a tensioning device for precise guide strap tensioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the guide table position is made variable to adjust guide apron tension, then the guide apron can be tensioned, but the position cannot be fixed with high precision
Solution Approach 1:
The system is divided into two independent parts: the bearing block with fixed guide table for precision positioning, and the bearing carriage for tensioning adjustment. This segmentation allows each component to fulfill its specific function optimally without compromise.
Solution Approach 2:
Instead of making the guide table movable for tensioning adjustment, the invention inverts the approach by making the bearing carriage movable while keeping the guide table fixed. This ensures the guide table position remains precise while still allowing tensioning through carriage displacement.
2Reliability
If the gap between guide apron and lower roller is reduced to prevent damage, then the apron is protected from damage, but drag flow affects the fiber structure
Solution Approach 1:
The invention converts the harmful drag flow effect into a beneficial positioning mechanism. The bearing carriage displacement against spring force creates a controlled pre-tension that positions the guide apron at an optimal distance from the roller, transforming the potential harm into precise gap control.
Solution Approach 2:
The system changes the parameter of gap distance from a fixed geometric constraint to a controllable elastic deformation parameter. By adjusting the bearing carriage position through spring compression, the gap distance can be optimized to balance protection and drag flow minimization.
3Ease of operation
If the bearing carriage is made movable for tensioning adjustment, then the guide strap can be tensioned, but the structure becomes more complex
Solution Approach 1:
The bearing carriage system is self-regulating through the spring mechanism. The spring automatically provides the necessary tensioning force, and the carriage self-positions when the guide strap is installed, eliminating the need for complex adjustment mechanisms or additional actuators.
Data Source
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AI summary
A drawing frame (1) is described for drawing a fibre slubbing (14) of a workstation of a textile machine having two roller pairs (2, 3) which are arranged behind one another in the transport direction (A) and in each case contain a drafting roller (4; 6) which can be driven, wherein the first drafting roller (4) in the transport direction (A) is assigned a guide apron (8) which wraps around this drafting roller (4) and a guide table (10) which is arranged between the first (4) and the second (6) drafting roller. It is provided according to the invention that the first drafting roller (4) is mounted in a bearing slide (19) which can be displaced in the transport direction (A), and the second drafting roller (6) is mounted in a bearing block (22), and that the guide table (10) is fixed on the bearing block (22) of the second drafting roller (6).