Sewing Machine Pressing Device With Guided Force Adjustment
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Solution Overview
Problem
Existing pressing devices for sewing machines have a complicated configuration for changing the pressing force applied to a workpiece, necessitating mechanisms like link mechanisms.
Innovation Solution
A pressing device with a first member, a second member, and a guide portion that allows for the second member to move between positions relative to the first member, simplifying the mechanism by eliminating the need for complex connections and adjusting the pressing force based on the position of the presser bar.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a known pressing device uses a connecting member and elastic member to change pressing force, then the pressing force can be adjusted, but the configuration becomes complicated
Solution Approach 1:
The patent removes the connecting member (link mechanism) from the system. Instead of using a separate connecting member to transmit movement from the presser bar to the second member, the second member is directly coupled to the presser bar, eliminating unnecessary components while preserving the pressing force adjustment function.
Solution Approach 2:
The patent combines the functions of multiple components into fewer elements. The second member directly integrates both the pressing force transmission function and the positioning function that were previously handled by separate connecting members and guide portions, simplifying the overall configuration.
2Adaptability or versatility
If a link mechanism is used to change pressing force, then the pressing force can be adjusted, but the mechanism becomes complicated
Solution Approach 1:
The patent extracts and removes the link mechanism from the system. The second member is directly coupled to the presser bar, eliminating the need for intermediate connecting members and making the mechanism simpler to operate and maintain.
Solution Approach 2:
Instead of using a complex link mechanism to transmit motion, the patent inverts the approach by having the second member directly follow the presser bar's movement through guide portions, achieving the same function with a simpler configuration.
3Adaptability or versatility
If a connecting member is used to transmit movement, then the pressing force can be changed, but the device complexity increases
Solution Approach 1:
The patent removes the connecting member from the system. The second member is directly coupled to the presser bar, eliminating unnecessary components while preserving the pressing force adjustment function through the guide portions.
Solution Approach 2:
The second member serves multiple functions: it transmits pressing force, maintains positioning through guide portions, and adjusts pressing force based on presser bar movement, eliminating the need for separate connecting members and elastic members.
Data Source
AI summary
A pressing device includes a first member including an attaching portion attachable to a presser bar and being configured to move in an up-down direction together with the presser bar urged downward; a second member including a contact portion contactable to a pressing portion including at least a portion of the first member or at least a portion of the presser bar and being configured to support a presser foot capable of downwardly pressing a workpiece on a bed, and in a state where the first member is attached to the presser bar and the second member supports the presser foot, move between a first position where the contact portion is in contact with the pressing portion and a second position where the contact portion is spaced from the pressing portion; and a first guide portion configured to guide movement of the second member relative to the first member.