Thread Winding Hook Design for Reliable Bobbin Change Clamping
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Solution Overview
Problem
Existing thread winding devices face challenges in reliably clamping threads during automatic bobbin changes without design complexity and risk of soiling from thread remnants, with previous solutions like catching slots, friction-based hooks, and movable hooks proving unreliable or costly.
Innovation Solution
A device with adjustable centering disks featuring a fixed hook with an outer cone that securely clamps the thread at a nose-shaped recess, ensuring reliable thread clamping without additional slots or grooves on the bobbin tube, using the interaction between the bobbin tube and centering disk to maintain tension and centering, and releasing the clamp when the bobbin is removed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a catching slot or catching notch is provided in the bobbin tube to hold the thread, then the thread can be caught during bobbin change, but the thread does not stay in the catching slot and leaves in the radial direction, and additionally the bobbin tubes have to be specially equipped which entails additional costs
Solution Approach 1:
The invention introduces an intermediary element - the centering disk with integrated hook - that mediates between the thread and the bobbin tube. The hook is provided on the centering disk rather than on the bobbin tube itself, allowing reliable thread catching without modifying the bobbin tube structure. This resolves the contradiction by providing reliable thread holding through the hook while keeping the bobbin tube manufacturing simple and unchanged.
2Device complexity
If the thread is held on the hook by friction, then the hook structure is simple, but the thread does not reliably remain on the hook for lack of adherence or because soiling occurs on it over time
Solution Approach 1:
The hook is designed with a specifically curved geometry that enables mechanical interlocking with the thread. The curved surface of the hook creates a geometric constraint that prevents the thread from slipping off, replacing reliance on friction with reliance on geometric interlocking. This resolves the contradiction by maintaining simple hook structure while achieving reliable thread retention through shape-based engagement rather than friction-based engagement.
3Ease of operation
If a movable hook is used that holds the thread with centrifugal force, then the hook can release clamping when the centering disk stops, but the hook can lose its functionality over time and it is technically complicated to introduce moving parts
Solution Approach 1:
The invention employs the self-service principle by utilizing the rotational motion of the centering disk during normal operation to automatically release the thread. The centrifugal force generated during rotation naturally pushes the thread off the hook, eliminating the need for additional moving parts or active release mechanisms. This resolves the contradiction by achieving automatic thread release through the inherent rotational motion of the system while keeping the hook structure simple and stationary.
4Reliability
If a fixed hook is provided on the centering disk aligned in the circumferential direction, then the thread can be caught during bobbin change, but additional measures are needed to ensure reliable clamping without losing functionality
Solution Approach 1:
The invention merges the hook function directly into the centering disk structure. The hook is formed as an integral part of the centering disk, combining the centering function and the thread catching function into a single component. This resolves the contradiction by achieving reliable thread clamping through the integrated hook design while avoiding the complexity of separate, additional clamping mechanisms or modifications to the centering disk.
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 solution provides a reliable, cost-effective thread clamping mechanism that securely holds threads of various diameters without additional moving parts, ensuring even bobbin unwinding and reducing the risk of soiling, while accommodating manufacturing irregularities in bobbin tubes.
Implementation Method 1
two opposing centering disks, adjustable in their axial distance from one another, for tensioning the bobbin tube, wherein the centering disks each comprise a centering cone that engages in an open bobbin tube end
Implementation Method 2
a fixed hook for catching the thread, which is aligned in the circumferential direction of this centering disk... an inner side of the hook is formed by at least one nose-shaped recess provided in the outer cone
Data Source
AI summary
A device and a method wind a thread on a winding machine. The winding machine has a spool sleeve and a spool holder, which has two oppositely disposed centering plates, having an adjustable axial distance relative to each other, for tensioning the spool sleeve. The centering plates each have a centering cone which engages in an open spool sleeve end, and an arrester hook for arresting the thread being provided in one of the centering plates. The arrester hook is oriented in the circumferential direction of the centering plate, and the centering plate having the arrester hook contains an outer cone which overlaps the outer diameter of the spool sleeve end. An inside of the arrester hook is formed by a nose-like recess provided in the outer cone.