Embroidery Frame Attachment Mechanism for High Retention Force
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Solution Overview
Problem
Existing embroidery frame attachment/detachment mechanisms in sewing machines face a trade-off between fixation force and operability, where increasing spring force to improve fixation reduces operability and vice versa.
Innovation Solution
The embroidery frame attachment/detachment device employs a pseudo quadric link mechanism with a fixation arm, attachment/detachment cam, and coupling link, using rollers and elastic members to achieve both high retention force and ease of operation, allowing for light operating force during attachment and detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If spring force is increased to improve fixation force of the embroidery frame, then fixation force is improved, but operating force increases which reduces operability
Solution Approach 1:
The patent applies a cam mechanism that transforms the attachment motion into a rotational motion of the fixation arm. The cam profile is designed to provide mechanical advantage during the attachment process, allowing the fixation arm to press the embroidery frame with high force while requiring minimal operating force from the user. This dynamic mechanism replaces the static spring-based system, resolving the contradiction between high fixation force and ease of operation.
Solution Approach 2:
The fixation arm acts as an intermediary mechanism between the user's attachment action and the embroidery frame. Instead of directly applying spring force to hold the frame, the cam-driven fixation arm mediates the force transmission, amplifying the user's input force into high fixation pressure on the embroidery frame while keeping the user's required operating force low.
2Reliability
If a spring-based engaging mechanism is used to fix the embroidery frame, then fixation is achieved, but the mechanism complexity increases and operability decreases
Solution Approach 1:
The patent extracts the spring element from the fixation mechanism and replaces it with a cam-based system. By removing the spring component, the mechanism becomes simpler with fewer parts that could fail, while the cam profile inherently provides the necessary fixation reliability through its geometric design. The fixation arm maintains reliable contact with the embroidery frame through the cam's continuous pressure during the attachment stroke.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration allows for a high retention force while maintaining ease of operation, enabling both effective attachment and detachment of the embroidery frame with minimal effort, thus addressing the trade-off between fixation force and operability.
Implementation Method 1
a shaft part of at least one of the fixation roller and the cam roller is elastically pressed and supported downward by an urging member
Data Source
AI summary
An embroidery frame driving device includes: a base plate firmly fixed to an X-Y driving unit of the embroidery frame driving device; a fixation arm provided on the base plate; an attachment/detachment cam; a removing link; a coupling link; and an embroidery frame. The embroidery frame is slid against the base plate to rotate the attachment/detachment cam and the fixation arm through pressing of a pressing part of a fixation part to press and fix one end of the fixation arm to a fixation groove of the fixation part in attachment of the embroidery frame. The removing link is operated to rotate the coupling link and the attachment/detachment cam to rotate the fixation arm and release pressing and fixation of the fixation groove of the fixation part by the one end of the fixation arm in detachment of the embroidery frame.