Sewing Machine Bobbin Winder Time-Based Thread Amount Detection

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Solution Overview

Problem

Existing bobbin thread winders for sewing machines lack accuracy in measuring the winding amount of thread around the bobbin, as it varies with the type and thickness of the thread, making it difficult to determine the exact amount wound.

Innovation Solution

Incorporating a time measuring unit to measure the thread winding execution time and a bobbin-thread winding amount calculating unit to calculate the winding amount based on this time, along with an outer diameter detecting unit to further refine the calculation, allowing for accurate determination of the thread amount wound regardless of thread type or thickness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the existing bobbin thread winder structure is used, then the device complexity is low, but the measurement precision of winding amount is insufficient

Engineering Contradiction:

Improvewinding amount measurement precisionVSAvoiddevice complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent replaces mechanical measurement methods with electronic measurement systems. Specifically, it uses a time measuring unit to measure winding execution time and a winding amount calculating unit to calculate the actual winding amount based on this time, substituting mechanical estimation methods with electronic measurement and calculation systems to achieve higher precision.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces intermediary components including a time measuring unit that measures winding execution time, a winding amount calculating unit that processes this time data, and optionally an outer diameter detecting unit that detects thread outer diameter. These intermediary units bridge the gap between simple mechanical operation and precise measurement.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If manual estimation of winding amount is used, then the ease of operation is high, but the reliability of winding amount determination is low

Engineering Contradiction:

Improvewinding amount determination reliabilityVSAvoidease of operation

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The system performs self-measurement and self-calculation of winding amount. The time measuring unit automatically measures the winding execution time, and the winding amount calculating unit automatically calculates the winding amount based on this time, eliminating the need for manual estimation by operators while ensuring reliable determination.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent implements feedback mechanisms where the time measuring unit provides measurement data to the winding amount calculating unit, which then determines the actual winding amount. This closed-loop feedback system ensures reliable determination of winding amount by continuously monitoring and calculating based on actual operation parameters.

Inventive Principle:

Principle #23Feedback

3Measurement precision

If the winding amount varies with thread type and thickness, then the adaptability to different thread types is high, but the measurement precision of winding amount is low

Engineering Contradiction:

Improvewinding amount measurement precisionVSAvoidthread type adaptability

Core Design Contradiction:

Measurement precisionVSAdaptability or versatility

Solution Approach 1:

The patent changes the measurement parameter from direct physical measurement of thread quantity to measurement of winding execution time. By measuring the time required to complete winding and calculating the winding amount based on this time parameter, the system achieves consistent precision across different thread types and thicknesses, as time measurement is not affected by thread physical properties.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS10472753B2Bobbin thread winder of sewing machine and sewing machine

Publication Date: 2019.11.12 JUKI CORP

AI summary

A bobbin thread winder of a sewing machine including a bobbin winder spindle holding a bobbin and a driving mechanism to apply a drive force to the bobbin winder spindle, comprises a time measuring unit to measure an bobbin-thread winding execution time with respect to the bobbin, and a bobbin-thread winding amount calculating unit which calculates a winding amount of the bobbin based on the bobbin-thread winding execution time with respect to the bobbin measured by the time measuring unit. In the bobbin thread winder, since the bobbin-thread winding execution time was measured by the time measuring unit, and the bobbin winding amount of the bobbin is calculated based on the bobbin-thread winding execution time by the bobbin-thread winding amount calculating unit, it is possible to detect the bobbin winding amount of the bobbin accurately regardless of the type and thickness of the bobbin thread.