Sewing Machine Spring Presser Release Mechanism
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Solution Overview
Problem
Sewing machines with the entire upper feed dog region on the rear side of the needle location point face challenges in feeding the sewing target effectively, as the presser spring's force is not adequately applied when the target is on the front side, leading to unsatisfactory feeding performance.
Innovation Solution
The sewing machine design includes a spring presser release mechanism with a transmission member that moves relative to the presser bar, releasing the force applied by the presser spring, and an upper feed mechanism coupled to the presser main body, ensuring the upper feed dog feeds the target effectively by matching the protrusion height of the lower feed dog, thus improving feeding performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire upper feed dog region is arranged on the rear side of the needle location point, then the upper feed dog can feed the sewing target effectively when positioned on the rear side, but the presser spring's force cannot be applied to the sewing target when it is on the front side, resulting in unsatisfactory feeding performance
Solution Approach 1:
The presser bar is designed to be movable in the vertical direction, transitioning between a first position (applying pressurizing force to the sewing target) and a second position (releasing the pressurizing force). This dynamic positioning allows the system to adapt to different sewing target positions, enabling effective feeding whether the target is on the front side or rear side of the needle location point
Solution Approach 2:
A linkage mechanism acts as an intermediary between the upper feed dog and the presser bar. When the upper feed dog contacts the sewing target, it transmits force through the linkage mechanism to move the presser bar vertically, thereby controlling the application or release of pressurizing force without direct mechanical connection
2Productivity
If the presser is moved further upward than the lower feed dog to release presser spring force during backward feeding, then the upper feed dog can feed the sewing target backward effectively, but the presser spring's pressing force has no effect on the sewing target at the start of feeding
Solution Approach 1:
The presser bar's vertical movability allows it to dynamically switch between applying and releasing pressurizing force. During initial feeding, the presser bar remains in the first position to apply pressing force. During backward feeding, the linkage mechanism moves the presser bar to the second position to release the force, enabling effective backward movement without compromising initial feeding performance
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 ensures satisfactory feeding of the sewing target by maintaining the presser spring's force application and enhancing operational convenience with improved visibility and operability during sewing.
Implementation Method 1
a presser spring configured to apply a force to a presser bar toward a lower side
Implementation Method 2
a transmission member that transmits the force applied by the presser spring to the presser bar
Implementation Method 3
the lower feed dog configured such that it protrudes from a needle plate comes in contact with the upper feed dog directly or otherwise indirectly via the sewing target
Data Source
AI summary
A sewing machine includes: a presser spring depressing a presser bar; a presser main body fixed thereto, including a presser; a lower feed dog protruding further upward than a needle plate, to feed a sewing target rearward; an upper feed mechanism above the lower feed dog, that includes an upper feed dog behind a needle location and feeds the sewing target rearward via the upper and lower feed dogs; and a spring presser release mechanism relatively movably mounted on the presser bar, including a transmission member transmitting presser spring force to the presser bar, and operating when the lower contacts the upper feed dog, lifting the transmission member relative to the presser bar, to release the force applied thereto. The movement of the transmission member with respect to the presser bar during spring presser release mechanism operation matches a movement of the lower feed dog protruding from the needle plate.