Multi-Component Slide for Lockstitch Sewing Machine Bobbin Case

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Solution Overview

Problem

The existing lockstitch sewing machines with rotary and Central Bobbin hooks face challenges due to the single-component slide design, which disrupts the continuity of the bobbin case profile, hindering the passage of the needle thread and requiring modifications to accommodate the slide's claw, leading to inefficiencies and potential thread damage.

Innovation Solution

The implementation of a multi-component slide system, where a main slide body and secondary components, such as a 'C-bent' metal sheet for the slide's claw, are used to create a continuous profile without the need for a through opening in the bobbin case, allowing for improved thread passage and reduced thickness, enabling seamless integration with existing sewing machines.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a single-component slide design is used, then the slide structure is simple and easy to manufacture, but it disrupts the continuity of the bobbin case profile and hinders needle thread passage

Engineering Contradiction:

Improveslide manufacturing simplicityVSAvoidneedle thread passage

Core Design Contradiction:

Ease of manufactureVSEase of operation

Solution Approach 1:

The slide is divided into multiple separate components: a main slide body and a slide claw. The slide body provides the structural foundation while the slide claw is a separate piece that can be optimized independently. This segmentation allows the slide claw to be designed specifically for thread passage without compromising the overall slide structure, resolving the contradiction between manufacturing simplicity and thread passage continuity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The slide claw is extracted as a separate component from the main slide body. This extraction allows the claw to be independently optimized for its specific function of guiding and protecting the needle thread, while the main slide body maintains its structural role. The separate claw can be precisely shaped to maintain profile continuity, directly addressing the thread passage problem.

Inventive Principle:

Principle #2Taking out (Extraction)

2Device complexity

If a single-component slide design is used, then fewer parts are required, but modifications to the bobbin case are required to accommodate the slide's claw

Engineering Contradiction:

Improvenumber of slide componentsVSAvoidbobbin case modification requirements

Core Design Contradiction:

Device complexityVSEase of manufacture

Solution Approach 1:

By segmenting the slide into a slide body and a separate slide claw, the design allows the claw to be independently attached to the bobbin case. This segmentation means that only minimal modifications to the bobbin case are needed—specifically, provisions for mounting the separate claw—rather than requiring major structural changes to accommodate an integrated single-component design.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The separate slide claw is combined with the slide body through a mounting connection, creating a functional unity. This merging approach allows the two components to work together as a complete slide assembly while maintaining the benefits of separate manufacturing and installation, reducing the need for extensive bobbin case modifications.

Inventive Principle:

Principle #5Merging (Combining)

3Ease of manufacture

If the slide claw is integrated into a single component, then manufacturing is simpler, but the profile continuity is disrupted and thread passage is hindered

Engineering Contradiction:

Improveslide component manufacturingVSAvoidbobbin case profile continuity

Core Design Contradiction:

Ease of manufactureVSShape

Solution Approach 1:

The slide is segmented into a slide body and a slide claw, where the claw is a separate component that can be precisely shaped and positioned. This segmentation enables the claw to be designed with smooth contours that maintain the profile continuity of the bobbin case, while still being manufactured separately for ease of production. The separate claw can be independently optimized for both manufacturing simplicity and profile continuity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The slide claw, as a separate component, can have localized optimizations in its shape and structure specifically tailored for maintaining profile continuity in critical areas while keeping the overall design simple for manufacturing. The local quality of the爪's shape can be precisely controlled to ensure smooth thread passage without compromising manufacturing ease.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS9797077B2Hook for lockstitch sewing machine comprising a bobbin case with a slide composed of multiple components

Publication Date: 2017.10.24 CM CERLIANI

AI summary

Hook for lockstitch sewing machine, both of the rotary type and of the Central Bobbin type (CB-shuttle or CB-hook), which includes a bobbin case (508, 708, 808, 908, 1008, 1108, 1208) with an improved slide, composed of multiple components, including a slide body (515a, 615a, 715a, 815a, 915a, 1115a, 1215a) which performs entirely the functions of guiding the slide on the bobbin case and of creation of the leverage with the lever (16, 16b), and at least one secondary component (582, 782, 882, 982, 1182, 1286), fixed to the slide body and apt to perform the function of slide's claw or guide and/or protection of the thread.