Adjustable Double Needle Distance Mechanism for Sewing Machines
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Solution Overview
Problem
Conventional double needle sewing machines require manual replacement of needle holders and plates to adjust needle distance for different materials, reducing efficiency and productivity when sewing various types of workpieces.
Innovation Solution
A double needle sewing machine with an adjustable double needle distance mechanism, allowing sideward movement of at least one needle to change the distance between the two needles, enabling automatic adjustment for different materials without manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If manual replacement of needle holder and needle plate is used to adjust needle distance, then the sewing machine can adapt to different materials, but the productivity and efficiency are reduced due to temporary stops
Solution Approach 1:
The patent applies the dynamics principle by making the needle holder and needle plate adjustable rather than fixed. The needle holder can move along the needle plate to change the distance between needles, allowing the machine to adapt to different materials dynamically during operation without stopping, thus resolving the contradiction between adaptability and productivity
Solution Approach 2:
The patent changes the parameter of needle distance by allowing the needle holder to be positioned at different locations on the needle plate. This parameter adjustment enables the sewing machine to handle various material thicknesses and types while maintaining continuous operation, eliminating the need for manual component replacement and preserving productivity
2Device complexity
If fixed needle distance is used in the sewing machine, then the structure is simple, but the machine cannot handle different material conditions without manual intervention
Solution Approach 1:
The patent segments the needle assembly into separate adjustable components: the needle holder and the needle plate. This segmentation allows the needle holder to be independently positioned on the needle plate, providing adjustability while keeping the overall structure relatively simple and avoiding excessive complexity
Solution Approach 2:
The patent introduces dynamic adjustability to the needle distance through the movable needle holder mechanism. This allows the system to transition from a fixed structure to an adjustable one, enabling the machine to handle different materials without requiring a completely complex reconfiguration system
3Adaptability or versatility
If manual adjustment of needle distance is performed, then the sewing machine can be adapted to different workpiece materials, but the operator's time and effort are consumed
Solution Approach 1:
The patent implements self-service by enabling the needle holder to be adjusted to different positions on the needle plate without requiring manual replacement of components. The adjustable mechanism allows the system to reconfigure itself for different materials, eliminating the time-consuming manual intervention process while maintaining adaptability
Data Source
Figure 1A
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AI summary
A sewing machine (1) includes a sewing head (11) having an upper shaft (142), a needle bar (151) and two needles (153), a double needle distance adjusting mechanism (30) and a double needle distance driving mechanism (40). The upper shaft (142) brings the needle bar (151) to move upward and downward, causing two needles (153) connected thereto to move synchronously. The double needle distance adjusting mechanism (30) includes an adjustment stem (31) extended through the needle bar (151) and brought by the double needle distance driving mechanism (40) to rotate, and an adjustment unit (32) located between the adjustment stem (31) and the two needles (153). The adjustment stem (31) in rotating enables the adjustment unit (32) to sidewardly move at least one of the two needles (153), so that the two needles (153) are located closer to or farther away from each other. With these arrangements, the distance between the two needles (153) of the sewing machine is adjustable at any time in the course of sewing workpieces requiring different double needle distances.