Sewing Machine Upper Feed Halting Mechanism
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Solution Overview
Problem
Sewing machines with upper and lower feed teeth systems face issues with unnecessary upper feed teeth, leading to burdensome replacement, limited application, safety concerns, and excessive noise and vibrations when the upper feed teeth are not used, as the driving mechanism continues to operate.
Innovation Solution
A sewing machine with an upper feed halting mechanism that includes a transmission control section to halt and restart the movement between the upper feed lower shaft and coupling section, utilizing an upper feed lower shaft supported rotatably on the machine body, coupled to the lower feed drive mechanism, and an upper feed coupling section that transmits movement to the upper feed shaft, allowing for easy installation and removal of upper feed teeth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the upper feed teeth are removed or withdrawn when not necessary, then the machine can adapt to different sewing needs, but the replacement work becomes burdensome and safety issues arise
Solution Approach 1:
The upper feed teeth are made dynamically adjustable through a rocking arm mechanism that allows them to be easily positioned between an operational position (protruding from the support plate) and a retracted position (withdrawn to the rear). This dynamic positioning system eliminates the need for complete removal and reinstallation, reducing operational burden while maintaining adaptability to different sewing requirements
Solution Approach 2:
The upper feed mechanism is segmented into separable components including the upper feed teeth, support plate, and rocking arm assembly. This segmentation allows the teeth to be independently adjusted or removed from the support plate, facilitating easy maintenance and adaptation while reducing the complexity of replacement operations
2Stability of the object's composition
If the upper feed teeth are withdrawn to the rear when not used, then the machine structure is maintained, but safety and usability deteriorate
Solution Approach 1:
The rocking arm provides a controlled dynamic mechanism for retracting the upper feed teeth to a safe rear position when not in use, while maintaining structural stability. The arm pivots on a fixed axis, ensuring the teeth are reliably positioned either forward for operation or rearward for safety, eliminating ambiguous intermediate states that could compromise usability
3Reliability
If the upper feed drive mechanism continues to operate when teeth are removed, then the mechanism remains ready for use, but noise and vibrations increase
Solution Approach 1:
The system incorporates feedback through the transmission control section that monitors the position of the upper feed teeth via the rocking arm mechanism. When the teeth are in the retracted position, the control section automatically halts the upper feed drive mechanism, preventing unnecessary noise and vibrations while maintaining system reliability by allowing quick repositioning when needed
4Speed
If the upper feed mechanism is constantly driven, then the machine is always ready for operation, but energy consumption and wear increase
Solution Approach 1:
The upper feed drive mechanism operates periodically rather than continuously, being activated only when the rocking arm positions the teeth in the operational forward position. The transmission control section enables and disables the drive mechanism based on the teeth position, reducing energy consumption and wear while maintaining readiness through quick repositioning capability
Data Source
Figure 1A~1B
Figure 2A~2D
Figure 3A~3C(ii)
AI summary
A sewing machine is provided, which has lower feed teeth which feed a sewing object by a lower feed drive mechanism having a lower drive shaft 92 as a drive source and upper feed teeth which are driven by an upper feed shaft that is coupled to and driven by the lower feed drive mechanism. The sewing machine is provided with an upper feed lower shaft 1 which is supported rotatably on a machine main body and is coupled to the lower feed drive mechanism, an upper feed coupling section which transmits movement of the upper feed lower shaft to the upper feed shaft, and a transmission control section which controls halting and restarting of transmission of movement of the upper feed lower shaft. The upper feed coupling section is held at a movement transmission halt position by operation of the transmission control section.