Horizontal-Axis Bobbin Output Structure to Prevent Thread Twisting
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Solution Overview
Problem
Conventional vertical-axis sewing thread output structures in textile sewing machines cause sewing threads to twist and become overstretched, leading to broken threads and unstitched products, resulting in high defect rates and reduced product quality and durability.
Innovation Solution
A horizontal-axis sewing thread output structure that allows the sewing thread bobbin to rotate horizontally, using a stator and rotor mechanism with positioning members to prevent twisting and shear stress, ensuring the thread is only subjected to pulling force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a vertical-axis sewing thread output structure is used, then the sewing thread can be output from the bobbin, but the sewing thread becomes twisted and subjected to shear stress, leading to broken threads
Solution Approach 1:
The patent inverts the conventional vertical-axis thread output structure to a horizontal-axis structure. The bobbin rotates horizontally around a horizontal axis instead of vertically, which fundamentally changes the thread path and eliminates the twisting and shear stress that occur in vertical-axis systems.
Solution Approach 2:
The patent transitions from a vertical dimension (vertical-axis rotation) to a horizontal dimension (horizontal-axis rotation). This dimensional change reorients the entire thread output mechanism, allowing the thread to be pulled off in a straight line without the spiral twisting that characterizes vertical-axis systems.
2Productivity
If the sewing thread is pulled off from the bobbin, then the sewing operation can proceed, but the thread becomes overly twisted and tightly stretched, causing broken threads and unstitching
Solution Approach 1:
By inverting the axis of rotation from vertical to horizontal, the patent eliminates the mechanism that causes excessive twisting. The horizontal rotation allows the thread to unwind naturally without spiraling, maintaining thread strength even during extended sewing operations.
Solution Approach 2:
The patent converts the potential harm of thread twisting into a benefit by using horizontal rotation. Instead of the thread twisting and breaking, the horizontal axis allows the thread to be pulled off smoothly and straight, transforming what would be a harmful twisting motion into a beneficial straight-line extraction.
3Device complexity
If a vertical-axis thread output structure is used, then the existing machine design can be maintained, but the shearing force from thread twist causes high defect rates and reworking time
Solution Approach 1:
The patent inverts the conventional vertical-axis design to horizontal-axis. While this requires redesigning the bobbin mounting and rotation mechanism, it eliminates the need for complex compensation mechanisms that would be required to deal with twisted threads, broken threads, and frequent stoppages for rethreading.
Solution Approach 2:
The patent converts the harm of increased device complexity into a benefit by showing that a simple horizontal-axis rotation mechanism eliminates the need for complex thread management systems, defect detection and correction systems, and frequent maintenance interventions, thereby improving overall manufacturing efficiency.
Data Source
AI summary
A horizontal-axis sewing thread output structure for use in a textile sewing machine includes a stator portion, a rotor portion, and a fixing portion. The stator portion is provided with a stator shaft that extends horizontally. The rotor portion is provided with a rotating member that can be rotated about an axis defined by the stator shaft and on which a sewing thread bobbin can be mounted. The fixing portion is configured to fix the sewing thread bobbin on the rotating member horizontally so that when outputting a sewing thread, the sewing thread bobbin can rotate naturally via the rotating member about the axis defined by the stator shaft, preventing the output sewing thread from being twisted. This helps reduce the instability factors of the manufacturing process of a sewn product and can lower the defect rate, and extend the service life, of the products manufactured.