Bobbin Thread Introduction Device for Automated Sewing Machines

Solution Overview

Problem

Existing sewing machines require frequent manual intervention to wind bobbin thread around the bobbin and guide it into the bobbin case, reducing efficiency due to limited bobbin thread capacity and the need for manual operation during thread changes.

Innovation Solution

A bobbin thread introduction device with a first motion module, bobbin thread clamping mechanism, and thread releasing mechanism that synchronously rotates the bobbin and bobbin case to wind and guide the thread, allowing automated mounting of the bobbin thread to the rotary hook.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the bobbin capacity is increased to reduce thread changes, then the rotation speed of the sewing machine must be reduced, but high rotation speed is needed for productivity

Engineering Contradiction:

Improverotation speedVSAvoidfrequency of thread changes

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The system performs self-service by automatically detecting when bobbin thread is depleted and executing the entire replacement sequence without human intervention. The control unit monitors thread consumption, triggers detachment of the exhausted bobbin case, and coordinates assembly of the replenished bobbin case, enabling the system to service itself and eliminate manual intervention time

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system prepares the replacement bobbin case in advance by pre-winding the bobbin with thread and pre-introducing the thread into the thread guiding slot before the actual sewing operation begins. This preliminary preparation ensures that when the replacement is needed, the new bobbin case is ready for immediate assembly, eliminating setup time during production

Inventive Principle:

Principle #10Preliminary action

2Extent of automation

If automatic bobbin replacement is implemented, then thread change frequency is reduced, but manual intervention is still required for winding and guiding thread

Engineering Contradiction:

Improveautomatic bobbin replacementVSAvoidmanual winding and guiding time

Core Design Contradiction:

Extent of automationVSLoss of time

Solution Approach 1:

The system performs self-service by automatically detecting when bobbin thread is depleted and executing the entire replacement sequence without human intervention. The control unit monitors thread consumption, triggers detachment of the exhausted bobbin case, and coordinates assembly of the replenished bobbin case, enabling the system to service itself and eliminate manual intervention time

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system prepares the replacement bobbin case in advance by pre-winding the bobbin with thread and pre-introducing the thread into the thread guiding slot before the actual sewing operation begins. This preliminary preparation ensures that when the replacement is needed, the new bobbin case is ready for immediate assembly, eliminating setup time during production

Inventive Principle:

Principle #10Preliminary action

3Ease of operation

If manual thread winding and guiding is required, then operational simplicity is maintained, but production efficiency is reduced

Engineering Contradiction:

Improvemanual operation simplicityVSAvoidproduction efficiency

Core Design Contradiction:

Ease of operationVSProductivity

Solution Approach 1:

The system performs self-service by automatically detecting when bobbin thread is depleted and executing the entire replacement sequence without human intervention. The control unit monitors thread consumption, triggers detachment of the exhausted bobbin case, and coordinates assembly of the replenished bobbin case, enabling the system to service itself and eliminate manual intervention time

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system prepares the replacement bobbin case in advance by pre-winding the bobbin with thread and pre-introducing the thread into the thread guiding slot before the actual sewing operation begins. This preliminary preparation ensures that when the replacement is needed, the new bobbin case is ready for immediate assembly, eliminating setup time during production

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentEP3763865B1Bobbin thread introduction device and sewing machine thereof

Publication Date: 2022.04.06 CHEE SIANG IND CO LTD

Figure 1
Figure 2
Figure 3A

AI summary

The bobbin thread introduction device of the present invention is mounted in the sewing machine and comprises: two motion modules, a clamp module and two moving modules. One of motion modules is provided with a blade, and can drive the bobbin to wind the bobbin thread. The clamp module at the clamping position can clamp bobbin thread, and can move back and forth on two different paths through two moving modules, so that the clamp module holds the bobbin thread to touch the blade. Wherein, the other motion module rotates when the bobbin thread contacts the bobbin case, which makes the rotating bobbin case guides the bobbin thread into the thread guiding slot of the bobbin case. By doing so, the two motion modules, the clamp module and the two moving modules can not only jointly wind the bobbin thread around the bobbin, but also introduce the bobbin thread.