Thread Delivery Device Asymmetrical Guide Surface
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Solution Overview
Problem
Existing thread delivery devices for textile machines are not designed for easy and space-efficient threading with a threading needle, and they lack a predictable exit direction for the needle.
Innovation Solution
A thread delivery device with a housing, storage body, and braking system that includes a brake body and adjusting device, where the brake body can be pressed against a clamping surface, and a cover element with an asymmetrical guide surface to predetermine the exit direction of the threading needle, allowing for easy threading and connection of thread ends.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a threading needle is used for threading the thread, then the threading operation can be performed mechanically, but the threading process becomes complex and space-consuming without proper guidance structures
Solution Approach 1:
The guide surface is pre-formed on the cover element with an asymmetrically positioned tip that protrudes into the threading path. This preliminary structural preparation creates a predetermined exit direction for the threading needle before the actual threading operation begins, eliminating the need for complex adjustment mechanisms during threading.
Solution Approach 2:
The guide surface acts as an intermediary element between the inlet opening and the external threading environment. Its asymmetrically positioned tip intercepts the threading needle and redirects it along a predetermined path, simplifying the overall threading operation while maintaining mechanical precision.
2Ease of operation
If the threading needle exit direction is not predetermined, then the device design remains simple, but the threading operation becomes unpredictable and difficult to perform
Solution Approach 1:
The guide surface tip is deliberately designed with asymmetric positioning relative to the inlet opening, creating a unique exit direction for the threading needle. This asymmetric geometry is manufactured as a single integrated feature on the cover element, providing predictable threading behavior without requiring complex assembly or adjustment mechanisms.
Solution Approach 2:
The guide surface introduces a localized geometric feature (the asymmetrically positioned tip) at a specific location on the cover element. This local modification to the otherwise simple cover structure creates the predetermined exit direction without significantly increasing overall manufacturing complexity.
3Reliability
If the brake body is made flexible and pressed against the clamping surface, then the yarn tension can be effectively adjusted, but the threading space becomes more constrained
Solution Approach 1:
The brake body is designed as a flexible element that can dynamically adjust its position and contact pressure against the clamping surface. This flexibility allows the brake body to conform to the available space while maintaining effective yarn tension control, resolving the conflict between reliability and space constraints.
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
Facilitates simple, space-saving threading with a predictable exit direction for the threading needle, improving the ease of use and efficiency in connecting thread ends during operation.
Implementation Method 1
the brake ring is provided with elastic elements that can be pressed against the clamping surface
Implementation Method 2
The adjusting device allows the brake element to be pressed against a clamping surface at the draw-off end of the storage body
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A yarn delivery device (1) for supplying a yarn (40) to a textile machine is provided with a housing (2) with a holder (2a), with a storage body (3) from which the yarn (40) is drawn by the textile machine, and with a braking device for adjusting the yarn tension of the yarn (40). The braking device has a brake element (8) and an adjusting device for the brake element, wherein the brake element (8) can be pressed against a clamping surface (3a) at the draw-off end of the storage body (3) by the adjusting device. The adjusting device comprises at least one actuating element and at least one discharge element, wherein the actuating element is axially movable with respect to the holder (2a), and wherein the discharge element is provided with an inlet opening oriented towards the brake element for guiding the yarn (40) coming from the brake element (8) towards the textile machine. A cover element is provided at the draw-off end of the storage body (3).The cover element is provided with a guide surface for guiding a threading needle coming from the outlet element to the brake body. The guide surface has a protrusion whose tip is asymmetrical or whose highest area is located in the region of the edge of the projection of the inlet opening onto the cover element and is situated at a point opposite to the exit direction (R) of the threading needle.