Horizontal Rotary Hook Beak Attachment Segmentation
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Solution Overview
Problem
Existing horizontal rotary hooks for sewing machines face issues with the increased size and potential damage due to the integration of a beak member, which complicates the structure and leads to thread entanglement and stress on the beak member when made separately and mounted on the outer peripheral wall.
Innovation Solution
A design where the beak member is separate from the rotating hook and mounted on an enlarged opening with a fitting holder, preventing the beak member from being laid on the outer peripheral wall, thus maintaining the thickness and allowing for reliable and firm attachment, with additional reinforcement to withstand outward stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the beak member is mounted inside the outer peripheral wall of the rotating hook, then the beak member can be attached to the rotating hook, but the thickness of the outer peripheral wall is increased and the size of the horizontal rotary hook is increased
Solution Approach 1:
The invention divides the attachment structure into two parts: the beak member itself and a separate attachment hole formed in the outer peripheral wall. The attachment hole provides a recess that receives the beak member, allowing secure attachment without increasing the overall thickness of the outer peripheral wall. This segmentation enables the beak member to be mounted reliably while maintaining the compact size of the rotating hook.
2Ease of manufacture
If the beak member is simply mounted to the bottom of the rotating hook made of synthetic resin, then the attachment process is simple, but sewing thread becomes entangled in the space between the inner rotating hook and the beak member, causing the beak member to be subjected to large external stress and potentially damaged
Solution Approach 1:
The invention extracts the attachment hole structure from the bottom surface and forms it in the outer peripheral wall instead. This repositioning eliminates the space between the inner rotating hook and beak member that causes thread entanglement. The beak member is attached to the side wall through the attachment hole rather than being mounted to the bottom, which prevents threads from becoming trapped and causing stress on the beak member during operation.
Solution Approach 2:
The attachment hole acts as an intermediary structure that securely receives the beak member. By providing a dedicated recess in the outer peripheral wall, the attachment hole mediates between the beak member and the rotating hook body, ensuring stable attachment without creating harmful spaces where threads could entangle and generate damaging forces.
3Device complexity
If the beak is formed integrally on the rotating hook, then the structure is simplified, but the forming die structure becomes complicated and the beak necessitates higher strength than other parts
Solution Approach 1:
The invention segments the beak from the rotating hook body, making them separate components. The beak member is manufactured independently and then attached to the rotating hook through the attachment hole in the outer peripheral wall. This segmentation simplifies the forming die structures, as each component can be formed with a simpler, more standard die design rather than requiring a complex integrated die for the entire assembly.
Data Source
AI summary
The present invention is a horizontal rotary hook for a sewing machine includes an inner bobbin case holder, an outer rotating hook made of a synthetic resin, a sliding surface formed on the rotating hook so as to be slid relative to the bobbin case holder with rotation of the rotating hook while an outer periphery of the bobbin case holder is placed on the rotating hook, an opening defined in an outer peripheral wall of the rotating hook so that a needle thread passes through the opening, and a beak mounted on an outer peripheral wall of the rotating hook for seizing a loop of the needle thread.