Sewing Machine Upper Feed Device Quick Presser Foot Swap
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Solution Overview
Problem
Conventional upper feed devices for sewing machines require users to detach the entire device from the presser bar to replace the presser foot, making the process cumbersome and troublesome.
Innovation Solution
The upper feed device features a design with a main body portion and a presser foot that includes grooves and pins, allowing the presser foot to be easily mounted and detached without removing the device from the presser bar, utilizing pins and protruding portions for secure engagement and easy handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the presser foot is secured to the main body portion using engagement shaft portions passing through holes, then the presser foot is firmly fixed, but replacing the presser foot requires removing the entire upper feed device from the presser bar
Solution Approach 1:
The engagement shaft portion is divided into a first engagement shaft portion and a second engagement shaft portion that can be independently removed. This segmentation allows the presser foot to be detached by removing only the engagement shaft portions rather than the entire upper feed device, resolving the contradiction between firm fixation and ease of replacement.
2Reliability
If the engagement shaft portions extend through the entire presser foot, then the presser foot is securely mounted, but the structure becomes complex and replacement is troublesome
Solution Approach 1:
The engagement shaft portions are extracted as separate, removable components from the main body of the presser foot. This allows the presser foot to maintain a simple structure while still achieving reliable mounting through the insertion of the engagement shaft portions into grooves on the main body portion.
Data Source
AI summary
An upper feed device includes a main body portion configured to be mounted to a presser bar of a sewing machine, and a presser foot configured to be detachably mounted to the main body portion. The main body portion has an upper feed dog, a first mounting portion, and a second mounting portion. The first mounting portion has a first groove opening downward, and the second mounting portion has a second groove opening downward. The presser foot has a presser plate, a first opposing portion, a second opposing portion, a first pin, a first protruding portion, a second pin, and a second protruding portion. An opening is formed in the presser plate. The first pin is configured to rotatably fit into the first groove. The second pin is configured to rotatably fit into the second groove.