Dual-Motor Sewing Machine Automatic Timing Adjustment

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Solution Overview

Problem

Conventional sewing machines require mechanical linkages between the needle and bobbin hook, increasing parts, noise, vibration, and maintenance costs, while also limiting synchronization to a single sewing direction.

Innovation Solution

A dual-motor sewing machine with automatic timing adjustment, using sensors to continuously sense the positions of the needle and bobbin hook, and motor controllers to synchronize their movement, eliminating mechanical linkages and allowing synchronization in any sewing direction and speed.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If mechanical linkages are used to link the needle to the bobbin hook, then synchronization between needle reciprocation and bobbin hook rotation is achieved, but the number of parts, noise, vibration, and maintenance costs increase

Engineering Contradiction:

Improvesynchronization between needle and bobbin hookVSAvoidnumber of parts and mechanical linkages

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent divides the single motor-driven system into two independent motor systems: a first motor for driving the needle bar reciprocation and a second motor for driving the bobbin hook rotation. This segmentation eliminates the need for mechanical linkages between the needle and bobbin hook, reducing parts count while maintaining synchronization through independent electronic control and sensor feedback for each motor.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent replaces the mechanical linkage system with an electronic control system. Sensors detect the positions of the needle and bobbin hook, and the controller electronically coordinates the two motors to maintain precise synchronization without physical mechanical connections, thereby eliminating noise and vibration from mechanical linkages.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If mechanical linkages are used to link the needle to the bobbin hook, then synchronization is maintained, but noise and vibration increase

Engineering Contradiction:

Improvesynchronization between needle and bobbin hookVSAvoidnoise and vibration

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Device complexity

If fixed mechanical linkages are used for synchronization, then a single motor can drive both needle and bobbin hook, but adaptability to different sewing directions and speeds is limited

Engineering Contradiction:

Improvesingle motor systemVSAvoidsynchronization in different sewing directions and speeds

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The patent employs dynamic, independently controlled motor systems with sensor feedback that can adapt to varying sewing conditions. The controller continuously adjusts the operation of both motors based on real-time position feedback, enabling precise synchronization in any sewing direction and at varying speeds, unlike fixed mechanical linkages.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent incorporates sensors that continuously detect the positions of the needle and bobbin hook, providing feedback to the controller. This feedback mechanism enables the system to automatically adjust and maintain precise synchronization between the two motors during operation, adapting to different sewing directions and speeds without mechanical constraints.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS10982367B2Dual-motor sewing machine with automatic timing adjustment

Publication Date: 2021.04.20 HANDI QUILTER

AI summary

Dual-motor sewing machine with automatic timing adjustment. In some embodiments, a sewing machine may include a frame, a needle bar configured to have a needle, a first motor configured to cause the needle bar to linearly reciprocate the needle with respect to the frame and into and out of a fabric, a first sensor configured to continuously sense a current position of the needle, a bobbin hook configured to function in connection with a bobbin, a second motor configured to cause the bobbin hook to rotate with respect to the frame, a second sensor configured to continuously sense a current position of the bobbin hook, and one or more motor controllers. The one or more motor controllers may be configured, based on the current positions sensed by the first sensor and the second sensor, to continuously and automatically adjust and synchronize timing of the first motor and/or the second motor.