Tilting Piston Thread Brake for Double-Wire Twisting Spindle
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Solution Overview
Problem
Existing two-for-one twisting spindles with thread brakes face issues of limited adjustability in thread pretension, leading to potential thread breakage due to excessive tension from anomalies like knots or dust lumps, and require significant space and complex threading mechanisms.
Innovation Solution
A thread brake design where the upper piston is guided with play within the housing, allowing it to tilt and give way laterally when anomalies occur, combined with adjustable spring elements and a pneumatic lower piston for easy threading, using wear-resistant materials to prevent jamming and facilitate smooth operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the upper piston is guided without play in the housing, then the braking force is stable and consistent, but thread anomalies cause strong tension increases and thread breakage
Solution Approach 1:
The upper piston is designed with play in the housing, allowing it to move dynamically from a central position to a tilted position when thread anomalies occur. This dynamic adjustment prevents thread breakage by accommodating knots, slubs, and dust lumps without causing excessive tension, while maintaining stable braking force during normal operation.
2Force
If multiple brake ball devices are arranged one behind the other to achieve higher prestresses, then the braking force increases, but the installation space and threading complexity increase significantly
Solution Approach 1:
Multiple braking functions are merged into a single compact thread brake housing. The design integrates an upper piston with an upper braking surface and a lower piston with a lower braking surface, both acting on a single brake ball, thereby achieving high braking force without requiring multiple separate brake ball devices arranged in series.
3Reliability
If the upper piston is designed to tilt and move laterally when anomalies occur, then thread breakage is prevented, but the guiding mechanism becomes more complex
Solution Approach 1:
The guiding mechanism for the upper piston employs a simple play-based design within the housing, allowing lateral movement and tilting without complex guide structures. This minimalistic approach enables the piston to accommodate thread anomalies while avoiding the complexity of elaborate guiding mechanisms.
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 design effectively prevents thread breakage by allowing the upper piston to automatically adjust to thread anomalies, ensuring consistent tension and easy threading while minimizing design complexity and space requirements.
Implementation Method 1
an upper piston, which is acted upon by a spring element and which is equipped with a first, upper braking surface
Implementation Method 2
The lower piston, onto which a second braking surface is integrated, can be lifted by a pneumatic actuator into a threading position
Implementation Method 3
two cylinders that slide telescopically into one another and are pressed apart by a spring element rest with their ball-shaped ends on braking surfaces and clamp the thread running through
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
The invention relates to a thread brake for a double-wire twisting spindle with a brake element mounted in the region of a hollow axis of the spindle between an upper and a lower braking surface, wherein the braking force can be defined and predetermined via the preload of at least one spring element acting on an axially displaceable upper piston in which the upper braking surface is integrated, and the thread brake can be pneumatically released for the insertion of a thread. According to the invention, the upper piston (27) accommodating the upper braking surface (28) is designed and guided with clearance (S) within a housing (16) of the thread brake (14) such that, if necessary, it can move into a position (I) in which its central longitudinal axis (37) forms an angle (α) with the central longitudinal axis (38) of the housing (16).