Presser Foot Stability via Segmented Mounting
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Solution Overview
Problem
The existing presser foot devices on sewing machines tend to jounce and tilt when sewing button holes, leading to uneven cloth feeding and angled stitching due to unequal upward forces on the rectangular metal plate, causing the sewing machine to feed cloth off-center.
Innovation Solution
A presser foot device with a wall portion, opposed portions, a pin, and abutting portions is mounted to the presser foot holder, where the pin engages with a groove and the abutting portions abut against the holder, providing additional stability and preventing jouncing by distributing forces more evenly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the presser foot device is mounted to the presser foot holder by only the engagement of the pin in the transverse groove, then the device structure is simple and easy to install, but the presser foot device may jounce and tilt when upward force becomes unequal, causing cloth feeding at an angle
Solution Approach 1:
The mounting structure is segmented into multiple independent components: the pin for transverse engagement, the abutting portion for lateral contact, and the opposed portions for guiding. This segmentation allows each component to perform a specific function, collectively providing stable mounting without excessive complexity.
Solution Approach 2:
The mounting structure transitions from one-dimensional pin engagement to multi-dimensional constraint by adding the abutting portion that contacts the presser foot holder in the lateral direction, and the opposed portions that extend in the third direction. This dimensional expansion prevents jouncing and tilting while maintaining structural simplicity.
2Ease of operation
If the presser foot device is mounted with only pin engagement, then the mounting operation is simple and quick, but the cloth feeding direction becomes inaccurate due to jouncing and tilting
Solution Approach 1:
The abutting portion is designed to automatically abut against the presser foot holder when the pin is engaged in the groove, creating a self-aligning mechanism. This self-service feature ensures accurate positioning without requiring additional adjustment operations, maintaining ease of mounting while improving feeding precision.
3Ease of manufacture
If the presser foot device structure is simplified to only pin and groove engagement, then the device is easier to manufacture and assemble, but the device lacks sufficient constraint to prevent jouncing under unequal upward forces
Solution Approach 1:
The pin, abutting portion, and opposed portions are merged into a single integrated mounting structure that can be manufactured as one piece. This merging maintains ease of manufacture while combining multiple functions (transverse engagement, lateral constraint, guiding) into a single component, ensuring reliable performance without increasing manufacturing complexity.
Data Source
AI summary
A presser foot device includes a wall portion, a pair of opposed portions, a pin, and an abutting portion. The wall portion extends in a first direction and a second direction intersecting the first direction. The pair of opposed portions extend in one direction of a third direction intersecting the first direction and the second direction from the wall portion, and face each other. The pin extends in the second direction between the pair of opposed portions, and engages with a groove provided in the presser foot holder. The abutting portion is provided with respect to the pin on one direction side of the first direction, and is provided on the one direction side of the third direction of an end surface in the one direction of the third direction, of the pair of opposed portions. The abutting portion abuts against the presser foot holder in the second direction.